CN212599818U - Overturning clamp and conveying line thereof - Google Patents

Abstract

The utility model discloses a upset anchor clamps and transfer chain thereof belongs to automobile production technical field. Including the anchor clamps base, the equal fixed mounting in both ends of anchor clamps base has lifting cylinder, and the equal fixedly connected with of piston rod of two sets of lifting cylinder lifts the frame, and equal fixed mounting has the upset bearing on two sets of lifting frames, circles the same welding jig of common fixedly connected with in two sets of upset bearings, and fixed mounting has the upset motor on one of them lifting frame, the output shaft and the welding jig fixed connection of upset motor. Still including carrying the base, carry the fixed middle part that sets up at the anchor clamps base of base and the two perpendicular setting, be equipped with guide rail two, no pole cylinder and locking subassembly on carrying the base, be equipped with the transport trolley of activity on the guide rail two, the fixed stopper two that is provided with in bottom of transport trolley, no pole cylinder is used for promoting transport trolley reciprocating motion, the locking subassembly is used for restricting the position of stopper two, saves installation space, degree of automation height, welding quality height.

Description

Overturning clamp and conveying line thereof

Technical Field

The utility model relates to a technical field that the automobile production was made especially relates to a welding jig and transfer chain that can realize the upset.

Background

With the continuous improvement of automation level of automobile welding production line, the mode of piece is more and more generally used through the robot gripping apparatus, and under the normal condition, the work piece that the welding was accomplished is placed on putting up the platform after, and the robot gripping apparatus directly grabs the work piece from the work piece top. However, sometimes, according to the requirements of workpiece structure and vehicle body surrounding manufacturing, the robot gripping apparatus needs to grip the workpiece from the reverse side of the workpiece so as to be beneficial to the requirement of workpiece online, and thus the welded workpiece needs to be turned over. The conventional overturning bracket of the welding fixture is large in size and mass, and can be operated by at least two or more people, the operation is also complicated, the efficiency is low, and the welding quality cannot be guaranteed. Meanwhile, in the manufacturing process of the automobile body, large-scale outer panel covering pieces such as a top cover and a side wall are easy to deform, and lifting appliances are not easy to convey in the air for a long distance.

SUMMERY OF THE UTILITY MODEL

The utility model aims at solving the prior art in not enough, so provide a upset anchor clamps and transfer chain thereof, realize that degree of automation is high, welding quality is high, save spatial layout, avoid the structural deformation in the transportation.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

the utility model provides a turning clamp, includes the anchor clamps base, the equal fixed mounting in both ends of anchor clamps base has lift cylinder, and is two sets of lift cylinder's the equal fixedly connected with of piston rod lifts the frame, and is two sets of it has the upset bearing, and is two sets of the same welding jig of common fixedly connected with in the circle of upset bearing, one of them fixed mounting has the upset motor on the frame to lift, the output shaft and the welding clamp fixed connection of upset motor.

Further preferably, the welding fixture comprises a fixed frame, a connecting plate, a connecting shaft and a pneumatic clamping assembly, two ends of the fixed frame are respectively and fixedly connected with connecting plates, connecting shafts are respectively and fixedly connected on the two connecting plates, the two connecting shafts are respectively and fixedly connected with the inner rings of the corresponding overturning bearings, the pneumatic clamping jaw assembly comprises a fixing plate, a primary cylinder, a hinged plate, a secondary cylinder and a clamping jaw, the fixed plate is arranged on the fixed frame, the fixed plate is rotationally connected with a primary cylinder through a rotating shaft, the output end of the primary cylinder is rotatably connected with a hinged plate, the hinged plate is rotatably connected on the fixed plate and is positioned in the same plane with the fixed plate, the hinged plate is rotatably connected with a secondary cylinder, the output end of the secondary cylinder is rotatably connected with a clamping jaw, and the clamping jaw is rotatably connected to the hinged plate.

Further preferred scheme, the bottom of fixed plate is provided with the moving structure, the moving structure includes articulated seat, tertiary cylinder and guide rail one, articulated seat fixed connection is on fixed frame, tertiary cylinder rotates to be connected on articulated seat, the output of tertiary cylinder rotates to be connected on the fixed plate, a guide rail fixed connection just with fixed plate sliding fit on the fixed frame of fixed plate below.

According to a further preferable scheme, each group of lifting frames is provided with a lifting stabilizing guide rod, the lifting stabilizing guide rods are connected to the clamp base in a sliding mode in the vertical direction, and the lifting frames can be effectively prevented from deviating in the lifting process through the lifting stabilizing guide rods.

In a further preferred embodiment, another shaft of the turnover bearing is fixedly connected with a limiting rod, the limiting rod is provided with a first limiting part and a second limiting part, the lifting frame is correspondingly fixedly connected with a first limiting block, and the first limiting block is provided with a third limiting part adaptive to the first limiting part and a fourth limiting part adaptive to the second limiting part.

The conveying base is fixedly arranged at the middle of the clamp base and is vertically arranged, a second guide rail, a rodless cylinder and a locking assembly are arranged on the conveying base, a movable conveying trolley is arranged on the second guide rail, a second limiting block is fixedly arranged at the bottom of the conveying trolley, the rodless cylinder is used for pushing the conveying trolley to move in a reciprocating mode, and the locking assembly is used for limiting the position of the second limiting block.

Further preferably, a bracket matched with the workpiece is arranged on the conveying trolley, and the workpiece is supported adaptively through the bracket.

According to a further preferable scheme, the two groups of locking assemblies are symmetrically arranged and comprise two fixed blocks and two locking structures, the two fixed blocks are respectively and fixedly connected to the conveying bases on two sides of the conveying trolley, the two groups of locking structures are formed by four-bar mechanisms, and when the conveying trolley moves towards one side far away from the two fixed blocks under the action of the rodless cylinder, the two fixed blocks are separated from the locking structures.

Also discloses a using method of the conveying line, which comprises the following steps:

firstly, a workpiece is placed on a welding fixture, a first-stage air cylinder is started to drive a hinged plate to rotate towards one side close to a fixed plate, and after the hinged plate is attached to the fixed plate, a second-stage air cylinder is started to drive a clamping jaw to fix the workpiece, and then welding is carried out;

step two, after the workpiece is welded, starting a lifting cylinder, driving a lifting frame to move upwards along a lifting stable guide rod through a piston rod of the lifting cylinder, turning over a motor to start to rotate towards the right side after the lifting frame moves upwards to a designed height, rotating until a second limiting part and a fourth limiting part are matched, and then positioning the workpiece below a welding fixture;

thirdly, the lifting cylinder is started again, the welding fixture and the workpiece are driven to return to the position where the workpiece can stably contact with the bracket on the conveying trolley through the piston rod of the lifting cylinder, and then the workpiece below the lifting cylinder is separated from the workpiece and stably placed on the bracket through sequentially starting the second-stage cylinder and the first-stage cylinder;

separating a limiting block II from a locking structure on the left side and a fixing block II by the conveying trolley under the action of the rodless cylinder, then moving the conveying trolley at a constant speed, reversely overturning the welding fixture to a first limiting part and a third limiting part for adaptation under the action of the overturning motor, and then starting the lifting cylinder again to restore the lifting frame and the welding fixture to the initial position through the piston rod;

step five, after the conveying trolley moves to the locking structure on the right side and the second fixing block locking limiting block at a constant speed, the rodless cylinder does not act on the conveying trolley, and the robot can grab the workpiece;

and step six, after the workpieces are grabbed, driving the conveying trolley to move to the position below the welding fixture under the action of the rodless cylinder again to wait for the next cycle of welding.

Compared with the prior art, the utility model discloses possess following beneficial effect:

the utility model discloses in at first the work piece is accomplished by the welding on welding jig, and the frame that will lift through lift cylinder lifts to suitable height after, lifts on the frame upset motor and drives the rotatory 180 degrees backs of welding jig through two upset bearings, and the work piece after welding is transferred to the pneumatic clamping jaw subassembly on the rethread welding jig, and degree of automation is high, practice thrift spatial layout, still improves production efficiency simultaneously.

The utility model discloses well pneumatic clamping jaw subassembly includes the one-level cylinder, the fixed plate, the articulated slab, second grade cylinder and clamping jaw, the piston rod through the one-level cylinder is overhanging with the articulated slab to being close to fixed plate one side and rotate and then stride across the work piece with the clamping jaw, the overhanging work piece that compresses tightly the clamping jaw of piston rod through the second grade cylinder in back, improve welding seam welding quality, otherwise then for unclamping the work piece after the welding is accomplished, the bottom of fixed plate is equipped with the moving structure simultaneously, the clamping jaw after can realizing the work piece welding of multiple specification and welding through the moving structure separates with the work piece fast, and the production efficiency.

The utility model discloses in gag lever post and the stopper that is equipped with one, first spacing portion and the spacing portion adaptation of third when the welding workpiece, the restriction that flip angle was realized to the spacing portion of second and the spacing portion adaptation of fourth after 180 degrees overturns, and the upset can be realized the work piece and rotated 180 degrees at every turn, can realize the effect of welding and upset, and then guarantees that the stability of work piece is transferred and is avoided the work piece to appear warping.

The utility model discloses still disclose a transfer chain, utilize upset anchor clamps 180 degrees backs of work piece upset after with the welding, and welding jig and work piece separation back, the work piece is placed on the travelling bogie, move to locking subassembly position department under the effect of rodless cylinder and carry out the robot and snatch work, the travelling bogie can realize separating with the locking subassembly under rodless cylinder effect, stopper two on the travelling bogie will can not control under locking subassembly limiting action and take place to remove when rodless cylinder does not have the effect, guarantee in the below in-process and snatch the work piece in-process work piece at the robot and be in comparatively stable state.

The utility model discloses locking subassembly in well transfer chain includes two and locking structures of fixed block, utilize the locking structure to be the mechanism design that four-bar linkage constitutes, when rodless cylinder effect transport dolly, carry to get off and will drive two extrusion locking structures of stopper, realize pushing down rotatory until stopper two separates completely with the locking structure, when rodless cylinder does not act on transport dolly, transport dolly will not take place any removal under the combined action of locking structure and stopper two, and then can effectively guarantee transport dolly's stability and reduced whole transfer chain's installation requirement.

Drawings

Fig. 1 is a schematic view of the overall structure of the present invention;

FIG. 2 is a connection diagram of the clamp base, the lift cylinder, the lift frame and the inverted compliment bearing of the present invention;

FIG. 3 is an enlarged view of a portion of FIG. 2 at A;

FIG. 4 is a schematic view of the overall structure of the welding jig of the present invention;

FIG. 5 is a partial enlarged view of the portion B in FIG. 4;

FIG. 6 is a schematic view of the overall structure of the conveying base of the present invention;

FIG. 7 is an enlarged view of a portion of FIG. 6 at C;

fig. 8 is a schematic view of the overall structure of the middle conveying trolley of the present invention.

In the figure: 1. a clamp base; 2. a lifting cylinder; 3. a lifting frame; 4. turning over the bearing; 5. turning over a motor; 6. a fixed frame; 7. a connecting plate; 8. a fixing plate; 9. a primary cylinder; 10. a hinge plate; 11. a secondary cylinder; 12. a clamping jaw; 13. a hinged seat; 14. a third-stage cylinder; 15. a first guide rail; 16. lifting the stable guide rod; 17. a limiting rod; 171. a first limiting part; 172. a second limiting part; 18. a first limiting block; 181. a third limiting part; 182. a fourth limiting part; 19. a conveying base; 20. a second guide rail; 21. a rodless cylinder; 22. a conveying trolley; 23. a second limiting block; 24. a bracket; 25. a second fixed block; 26. and a locking structure.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments.

In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships 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 being referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention.

Example 1:

as shown in fig. 1 to 4, the overturning clamp comprises a clamp base 1, wherein a lifting cylinder 2 is fixedly mounted at the front end and the rear end of the clamp base 1, a lifting frame 3 is fixedly connected to the piston rods of two groups of lifting cylinders 2, a lifting stabilizing guide rod 16 is arranged on each group of lifting frame 3, and the lifting stabilizing guide rods 16 are connected to the clamp base 1 in a sliding manner along the vertical direction. The two groups of lifting frames 3 are fixedly provided with turnover bearings 4, and the inner rings of the two groups of turnover bearings 4 are fixedly connected with the same welding fixture. A turnover motor 5 is fixedly arranged at the rear part of the rear lifting frame 3, and an output shaft of the turnover motor 5 is fixedly connected with the welding fixture through a coupler. After the workpiece on the welding fixture is welded, the overturning motor 5 rotates forwards and backwards to drive the welding fixture to rotate, so that the workpiece is located below the welding fixture, the workpiece is separated from the workpiece by the welding fixture to be placed downwards, the production efficiency can be greatly improved, and the automation level is improved.

The shaft of the front side turning bearing 4 is fixedly connected with a limiting rod 17, the limiting rod 17 is of an L-shaped structure, a first limiting portion 171 not at the bottom and a second limiting portion 172 at the top are arranged on the limiting rod 17, a first limiting block 18 is fixedly connected to the lifting frame 3 corresponding to the turning bearing 4, and a third limiting portion 181 which is matched with the first limiting portion 171 and is located at the top and a fourth limiting portion 182 which is matched with the second limiting portion 172 and is located at the top are arranged on the first limiting block 18. When welding the work piece, the work piece was located welding jig's top this moment in first spacing portion 171 and the spacing portion 181 adaptation of third, when upset motor 5 drove welding jig upset, finally after spacing portion 172 of second and the spacing portion 182 adaptation of fourth, welding jig upset 180 degrees this moment, and the work piece is located welding jig's below, and rethread welding jig makes the work piece realize transferring.

The welding fixture comprises a fixed frame 6, a connecting plate 7, connecting shafts and a pneumatic clamping assembly, the two ends of the fixed frame 6 are fixedly connected with the connecting plate 7 respectively, the two connecting plates 7 are fixedly connected with the connecting shafts respectively, and the two connecting shafts are fixedly connected with the inner rings of the corresponding overturning bearings 4 respectively. Pneumatic clamping assembly includes fixed plate 8, one-level cylinder 9, articulated slab 10, second grade cylinder 11 and clamping jaw 12, fixed plate 8 is vertical to be installed on fixed frame 6, rotate through the pivot on the fixed plate 8 and be connected with one-level cylinder 9, the output of one-level cylinder 9 is connected with articulated slab 10 of vertical setting through rotation axis rotation, articulated slab 10 rotates through the rotation axis to be connected on fixed plate 8 and is located the coplanar with fixed plate 8, be connected with second grade cylinder 11 through the pivot rotation on articulated slab 10, second grade cylinder 11's output is rotated through the pivot and is connected with clamping jaw 12, clamping jaw 12 rotates through the pivot and connects on articulated slab 10. The hinged plate 10 is rotated towards one side close to the fixed plate 8 by the extension of the piston rod of the primary cylinder 9, so that the clamping jaw 12 crosses over the workpiece, then the clamping jaw 12 is pressed tightly on the workpiece by the extension of the piston rod of the secondary cylinder 11, the quality of a welding seam is ensured, and otherwise, the workpiece after welding is loosened.

The embodiment can be realized in the concrete implementation, firstly, a workpiece is placed on a welding fixture, a first-stage cylinder 9 is started to drive a hinged plate 10 to rotate towards one side close to a fixed plate 8, after the hinged plate 10 is attached to the fixed plate 8, a second-stage cylinder 11 is started to drive a clamping jaw 12 to fix the workpiece, then welding is carried out, after welding is completed, a lifting cylinder 2 is started to drive a lifting frame 3 to move upwards along a lifting stable guide rod 16, a turning motor 5 is started to rotate towards the right side after the hinged plate 10 moves upwards to a designed height, when a second limiting part 172 and a fourth limiting part 182 are matched, turning is carried out for 180 degrees, the workpiece is positioned below the welding fixture, a piston rod of the lifting cylinder 2 returns to a certain distance until the workpiece can be stably contacted with a containing surface, then the second-stage cylinder 11 and the first-stage cylinder 9 are started in sequence to realize separation, the workpiece is removed, the turnover motor 5 is turned to the left side until the first limiting portion 171 and the third limiting portion 181 are matched, the reset work of the welding fixture is completed, and then the lifting cylinder 2 is started again to restore the lifting frame 3 and the welding fixture to the initial positions through the piston rod.

Example 2:

as shown in fig. 5, the bottom of the fixing plate 8 is provided with a moving structure, the moving structure includes a hinged seat 13, a third-stage cylinder 14 and a first guide rail 15, the hinged seat 13 is fixedly connected to the fixing frame 6, the third-stage cylinder 14 is rotatably connected to the hinged seat 13, the output end of the third-stage cylinder 14 is rotatably connected to the fixing plate 8, and the first guide rail 15 is fixedly connected to the fixing frame 6 below the fixing plate 8 and is in sliding fit with the fixing plate 8. Meanwhile, the bottom of the fixing plate 8 is provided with a moving structure, the fixing plate 8 is pushed to move outwards through the extension of the piston rod of the three-stage cylinder 14, so that workpieces of various specifications can be welded, and the welded clamping jaws can be quickly separated from the workpieces, and the production efficiency is improved.

Example 3:

as shown in fig. 6 to 7, a conveying line includes the turning fixture in embodiment 2, and further includes a conveying base 19, the conveying base 19 is fixedly disposed in the middle of the fixture base 1, and the two are vertically disposed, a second guide rail 20, a rodless cylinder 21 and a locking assembly, which are transversely disposed on the conveying base 19 from left to right, a conveying trolley 22, which is movable from left to right, is disposed on the second guide rail 20, and a second limiting block 23 and a bracket 24, which is located on the upper surface and is adapted to a workpiece, are fixedly disposed at the bottom of the conveying trolley 22. Rodless cylinder 21 is used for promoting transport trolley 22 reciprocating motion, rodless cylinder 21 is prior art, locking subassembly bilateral symmetry sets up and is equipped with two sets ofly, two sets of locking subassemblies all include fixed block two 25, locking structure 26, two sets of fixed block two 25 are fixed connection respectively on the transport base 19 of transport trolley 22 left and right sides, two sets of locking structures 26 are four-bar linkage and constitute, when transport trolley 22 was moved to one side of keeping away from fixed block two 25 under rodless cylinder 21 effect, spacing block two 23 was separated with locking structure 26. When the rodless cylinder 21 acts on the conveying trolley 22, the conveying trolley 22 drives the second limiting block 23 to extrude the locking structure 26, the downward rotation is achieved until the second limiting block 23 is completely separated from the locking structure 24, when the rodless cylinder 21 does not act on the conveying trolley 22, the conveying trolley 22 cannot move under the combined action of the locking structure 24 and the second limiting block 23, and therefore the stability of the conveying trolley 22 can be effectively guaranteed, and the installation requirement of the whole conveying line is lowered.

The embodiment can be realized in a specific implementation manner, when the lifting cylinder 2 starts the lifting welding fixture to the highest position, the workpiece is turned over by the turning motor 5, then the welding fixture is moved downwards under the reverse action of the lifting cylinder 2 to be contacted with the workpiece and the bracket 24 on the conveying trolley 22, the welding fixture is separated from the workpiece and then is placed on the conveying trolley 22, the conveying trolley 22 enables the second limiting block 23 to be separated from the locking structure 26 and the second fixing block 25 on the left side under the action of the rodless cylinder 21, then the conveying trolley 22 moves at a constant speed, meanwhile, the welding fixture is turned over reversely under the action of the turning motor 5, the locking structure 26 and the second fixing block 25 moving to the right side at a constant speed lock the second limiting block 23, at the moment, the rodless cylinder 21 does not act on the conveying trolley 22, a robot can grab the workpiece, and after the grabbing is completed, the conveying trolley 22 enables the locking structure 26 on the right side and the fixing block II 25 to separate the limiting block II 23 under the action of the rodless cylinder 21, and moves to the position right below the welding fixture, and at the moment, the limiting block II 23, the fixing block II 25 on the left side and the locking structure 26 achieve position locking.

Example 4:

also discloses a using method of the conveying line, which comprises the following steps:

firstly, a workpiece is placed on a welding fixture, a first-stage air cylinder 9 is started to drive a hinged plate 10 to rotate towards one side close to a fixed plate 8, and after the hinged plate 10 is attached to the fixed plate 8, a second-stage air cylinder 11 is started to drive a clamping jaw 12 to fix the workpiece, and then welding is carried out;

step two, after the welding of the workpiece is finished, the lifting cylinder 2 is started, the lifting frame 3 is driven by a piston rod of the lifting cylinder to move upwards along the lifting stable guide rod 16, the overturning motor 5 is started to rotate towards the right side after the lifting frame moves upwards to the designed height, the lifting frame rotates until the second limiting part 172 is matched with the fourth limiting part 182, and the workpiece is located below the welding fixture at the moment;

thirdly, the lifting cylinder 2 is started again to drive the welding fixture and the workpiece to return to the position where the workpiece can stably contact the bracket 23 on the conveying trolley 22 through the piston rod of the lifting cylinder, and then the second-stage cylinder 11 and the first-stage cylinder 9 are started in sequence to separate the workpiece from the workpiece and stably fix the workpiece below the workpiece to the bracket 23;

fourthly, the second limiting block 23 is separated from the locking structure 26 on the left side and the second fixing block 25 by the second conveying trolley 22 under the action of the rodless cylinder 21, then the second conveying trolley 22 moves at a constant speed, meanwhile, the welding fixture is reversely turned over under the action of the turning motor 5 until the first limiting part 171 and the third limiting part 181 are matched, and then the lifting cylinder 2 is started again to restore the lifting frame 3 and the welding fixture to the initial positions through the piston rod;

step five, after the conveying trolley 22 moves to the locking structure 26 on the right side at a constant speed and the second fixing block 25 locks the second limiting block 23, the rodless cylinder 21 does not act on the conveying trolley 22, and the robot can grab the workpiece;

and step six, after the workpieces are grabbed, driving the conveying trolley 22 to move to the position below the welding fixture under the action of the rodless cylinder 21 again, and waiting for the next cycle of welding.

The above description is only a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto. The substitution may be of partial structures, devices, method steps, or may be a complete solution. According to the technical scheme of the utility model and utility model thereof think of and equal replacement or change, all should cover within the scope of protection of the utility model.

Claims (8)

1. The utility model provides a turning clamp, its characterized in that, includes anchor clamps base (1), the equal fixed mounting in both ends of anchor clamps base (1) has lift cylinder (2), and is two sets of the equal fixedly connected with of piston rod of lift cylinder (2) lifts frame (3), and is two sets of equal fixed mounting has upset bearing (4) on lifting frame (3), and is two sets of the same welding jig of common fixedly connected with in the circle of upset bearing (4), one of them fixed mounting has upset motor (5) on lifting frame (3), the output shaft and the welding jig fixed connection of upset motor (5).

2. A turning clamp according to claim 1, characterized in that the welding clamp comprises a fixed frame (6), connecting plates (7), connecting shafts and a pneumatic clamping assembly, wherein the two ends of the fixed frame (6) are respectively and fixedly connected with the connecting plates (7), the two connecting plates (7) are respectively and fixedly connected with a connecting shaft, the two connecting shafts are respectively and fixedly connected with inner rings of corresponding turning bearings (4), the pneumatic clamping assembly comprises a fixed plate (8), a primary cylinder (9), a hinged plate (10), a secondary cylinder (11) and a clamping jaw (12), the fixed plate (8) is arranged on the fixed frame (6), the fixed plate (8) is rotatably connected with the primary cylinder (9) through a rotating shaft, the output end of the primary cylinder (9) is rotatably connected with the hinged plate (10), the hinged plate (10) is rotatably connected on the fixed plate (8) and is positioned in the same plane with the fixed plate (8), the hinged plate (10) is connected with a secondary cylinder (11) in a rotating mode, the output end of the secondary cylinder (11) is connected with a clamping jaw (12) in a rotating mode, and the clamping jaw (12) is connected to the hinged plate (10) in a rotating mode.

3. An overturning clamp according to claim 2, wherein the bottom of the fixing plate (8) is provided with a moving structure, the moving structure comprises a hinge seat (13), a third-stage air cylinder (14) and a first guide rail (15), the hinge seat (13) is fixedly connected to the fixing frame (6), the third-stage air cylinder (14) is rotatably connected to the hinge seat (13), the output end of the third-stage air cylinder (14) is rotatably connected to the fixing plate (8), and the first guide rail (15) is fixedly connected to the fixing frame (6) below the fixing plate (8) and is in sliding fit with the fixing plate (8).

4. A turning clamp according to claim 1, characterized in that each set of lifting frames (3) is provided with a lifting stabilizing guide rod (16), and the lifting stabilizing guide rods (16) are slidably connected to the clamp base (1) in the vertical direction.

5. The overturning clamp according to claim 1, wherein a shaft of the other overturning bearing (4) is fixedly connected with a limiting rod (17), the limiting rod (17) is provided with a first limiting portion (171) and a second limiting portion (172), the corresponding lifting frame (3) is fixedly connected with a first limiting block (18), and the first limiting block (18) is provided with a third limiting portion (181) adapted to the first limiting portion (171) and a fourth limiting portion (182) adapted to the second limiting portion (172).

6. The conveying line comprises the overturning fixture as claimed in any one of claims 1 to 5, and is characterized by further comprising a conveying base (19), wherein the conveying base (19) is fixedly arranged in the middle of the fixture base (1) and is vertically arranged, a second guide rail (20), a rodless cylinder (21) and a locking assembly are arranged on the conveying base (19), a movable conveying trolley (22) is arranged on the second guide rail (20), a second limiting block (23) is fixedly arranged at the bottom of the conveying trolley (22), the rodless cylinder (21) is used for pushing the conveying trolley (22) to move in a reciprocating mode, and the locking assembly is used for limiting the position of the second limiting block (23).

7. Conveyor line according to claim 6, characterized in that the transport carriages (22) are provided with carriers (24) adapted to the work pieces.

8. The conveying line according to claim 6, wherein two groups of locking assemblies are symmetrically arranged, each two groups of locking assemblies comprises a second fixed block (25) and a locking structure (26), the two groups of second fixed blocks (25) are respectively and fixedly connected to the conveying bases (19) on two sides of the conveying trolley (22), each two groups of locking structures (26) is composed of a four-bar mechanism, and when the conveying trolley (22) moves to the side far away from the second fixed block (25) under the action of the rodless cylinder (21), the second limiting block (23) is separated from the locking structures (26).

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