Die changing arm with overturning and automatic clamping functions

Abstract

The die changing joint comprises an upper supporting seat, a middle supporting seat and a lower supporting seat which are fixed to a machine body, the middle supporting seat is axially and slidably connected with a longitudinally-arranged oil cylinder, a piston rod of the oil cylinder is fixed to the lower supporting seat, the cylinder bottom of the oil cylinder is located on the upper side of the middle supporting seat, and a guide rod is coaxially fixed to the cylinder bottom of the oil cylinder; the guide rod extends upwards and is in sliding supporting connection with the upper supporting seat, the side, close to the oil cylinder, of the guide rod is connected with a multi-joint die changing arm through a rotating seat, the tail end of the die changing arm is rotationally connected with an overturning arm, and the overturning arm is connected with a pneumatic clamping mechanism used for clamping workpieces; the telescopic action of the oil cylinder relative to the piston rod drives the guide rod to slide up and down along the upper supporting seat, and the multi-joint die changing arm can drive the overturning arm to stretch and translate to a specified workpiece position for clamping. According to the die changing arm structure, die changing clamping, carrying translation and workpiece placing can be conveniently achieved, and lifting equipment does not need to be used for assistance.

Description

Technical Field

[0001] The present invention relates to the technical field of auxiliary equipment for an automated stamping production line, and particularly relates to a die-changing joint with flipping and automatic clamping functions used for die replacement and handling in stamping production dies. Background Art

[0002] In die stamping production, different products require die replacement. For large presses, the upper die and the lower die need to be moved into and out of the press as a whole, and then other tools are used for handling. The patent specification with the publication number CN104108198A in the prior art discloses a telescopic lifting die-changing arm, which is provided with three articulated arms connected by a slewing mechanism, and can realize the movement of the hanging mechanism at any angle and position within a certain radius range. Moreover, the whole die-changing arm can be lifted through a cylinder guide rail mechanism, so that the die-changing arm can flexibly realize the lifting and moving operations. The three-section foldable, telescopic and slewing die-changing arm is convenient for the die-changing arm to extend into the upper and lower dies of the press to hang and move the die, which brings convenience to the replacement of large dies. However, when replacing the upper die with the above-mentioned telescopic lifting die-changing arm, the die can only be placed flat on the end die-changing arm, translated out between the upper and lower dies of the press, and then moved and placed at the designated die storage position by a lifting tool. That is to say, the die-changing arm only has a stable function and cannot unload the die from the die-changing arm through its own actions. In addition, using a lifting tool not only increases the operating equipment and operating links, but also reduces the die-changing efficiency. Summary of the Invention

[0003] Aiming at the problems existing in the use of the above-mentioned telescopic lifting die-changing arm in the prior art, the present invention provides a die-changing joint with flipping and automatic clamping functions. A flipping mechanism and a pneumatic clamping mechanism are added to the end of the lifting and telescopic die-changing arm to realize the continuous operation functions of grasping, translating, handling and placing the die through the die-changing arm during die replacement, eliminating the use of a lifting tool and improving the die-changing efficiency.

[0004] The purpose of the present invention is achieved as follows. A die-changing arm with flipping and automatic clamping functions is characterized in that it includes an upper support seat, a middle support seat and a lower support seat which are sequentially arranged from top to bottom and fixed to the fuselage. An axially sliding longitudinal oil cylinder is connected to the middle support seat. The piston rod of the oil cylinder is fixed to the lower support seat. The bottom of the oil cylinder is located above the middle support seat and coaxially fixed with a guide rod. The guide rod extends upward and is slidably supported by the upper support seat. A multi-joint die-changing arm is connected to the guide rod near the oil cylinder through a rotating seat. A flipping arm is rotatably connected to the end of the die-changing arm. A pneumatic clamping mechanism for clamping a workpiece is connected to the flipping arm. The telescopic movement of the oil cylinder relative to the piston rod drives the guide rod to slide up and down along the upper support seat. The multi-joint die-changing arm can drive the flipping arm to telescopically translate to a specified workpiece position to clamp and place the workpiece.

[0005] For the die change arm structure of the present invention, a flipping arm and a pneumatic clamping mechanism are provided at the end of the die change arm, which can directly clamp the upper die and the lower die. Then, through the lifting, folding and translation functions of the die change arm, the clamped die can be translated and transported. When reaching the designated position, the direction can be flipped directly while clamping, and the die is placed at the designated position, eliminating the operation steps of replacing the clamping tooling and mobilizing the lifting tooling, greatly improving the die change efficiency. At the same time, during the handling and translation process, the die is always clamped by the pneumatic clamping tooling, which can prevent the die from falling during the handling process and causing problems such as injury accidents.

[0006] To facilitate the adjustment of the clamping direction for clamping and placing the upper die or the lower die, a set sleeve counterbore is provided at the end of the flipping arm that is flip-connected to the end of the die change arm. A bearing is installed inside the set sleeve counterbore that is sleeved with the end of the die change arm to facilitate the rotation of the flipping arm. A worm gear is rotatably connected to the circumferential corresponding part of the outer periphery of the die change arm and the end of the flipping arm through a bearing. The worm gear is fixed to the circumferential end of the flipping arm by a plurality of bolts. A worm driven by a speed reducer is installed on the die change arm. The meshing movement of the worm and the worm gear realizes the rotation of the flipping arm to adjust the direction for clamping or placing the workpiece.

[0007] To facilitate clamping the workpiece, the pneumatic clamping mechanism includes a fixed clamping jaw and a movable clamping jaw fixed to the flipping arm. The movable clamping jaw is connected to the piston rod of the clamping oil cylinder; the cylinder body of the clamping oil cylinder is fixed to the rotating arm, and the extending end of the piston rod is fixed to the movable clamping jaw. A compression spring is also provided between the inner side of the bottom of the clamping oil cylinder and the piston rod.

[0008] To facilitate improving the bearing capacity at the connection between the die change arm and the guide rod, a cylindrical roller bearing, a thrust ball bearing, and a tapered roller bearing are sequentially arranged from top to bottom at the part where the rotating seat is rotatably connected to the guide rod. A spacer sleeve for the upper and lower bearings to abut against is circumferentially embedded in the guide rod between the thrust ball bearing and the tapered roller bearing. Upper and lower covers are respectively provided at the upper and lower ends of the rotating seat. The upper and lower covers are fixed to the circumferential of the rotating seat by a plurality of bolts. In the rotating connection structure between the rotating seat and the guide rod, the cylindrical roller bearing has a high radial bearing capacity. The middle thrust ball bearing is specifically used to bear the axial load to improve the bearing capacity when the die change arm is translated and folded. The following is a tapered roller bearing, which can bear a heavier combined radial and axial load. Therefore, compared with the linear slide rail mechanism driven by a hydraulic cylinder, the lifting structure of the present invention has a stronger bearing capacity and is suitable for handling heavier workpieces.

[0009] For the lifting and sliding of the sliding guide rod, the upper support seat is provided with an installation hole for penetrating and installing the guide rod, and an upper copper sleeve is fixedly installed inside the installation hole. The upper copper sleeve is axially slidably installed with the guide rod; a lower copper sleeve is provided at the part where the middle support seat is slidably connected to the oil cylinder, and the lower copper sleeve is fixed to the corresponding installation hole of the middle support seat.

[0010] For the convenience of the fitting connection between the oil cylinder and the guide rod, the end of the guide rod connected to the oil cylinder axially extends into the oil cylinder and is fixed to the oil cylinder in a circumferential direction by a plurality of radial pins and screws. An abutting shoulder is provided between the extending end of the guide rod and the inner circumference of the oil cylinder, and the extending end of the guide rod at the end of the shoulder is in sealing fit with the oil cylinder and is provided with a sealing ring.

[0011] Furthermore, the die-changing arm includes a plurality of articulated arms that are at least one joint-connected and can be folded and telescoped. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a schematic structural diagram of the die-changing arm with the functions of flipping and automatic clamping of the present invention.

[0013] Figure 2 is Figure 1 the partial enlarged view at I in

[0014] Figure 3 is Figure 1 the partial enlarged view at II in

[0015] Figure 4 is Figure 1 the partial enlarged view at III in

[0016] Wherein, 1 is the upper support seat; 2 is the middle support seat; 3 is the lower support seat; 4 is the rotating seat; 401 is the cylindrical roller bearing; 402 is the thrust bearing; 403 is the tapered roller shaft; 404 is the upper cover; 405 is the lower cover; 406 is the spacer sleeve; 5 is the die-changing arm; 501 is the end of the die-changing arm; 6 is the guide rod; 601 is the shoulder; 7 is the upper copper sleeve; 8 is the oil cylinder; 801 is the piston rod; 9 is the clamping mechanism; 901 is the fixed clamping jaw; 902 is the movable clamping jaw; 903 is the piston rod; 904 is the clamping oil cylinder; 905 is the compression spring; 10 is the upper die; 11 is the lower die; 12 is the rotating arm; 1201 is the sleeved counterbore; 13 is the lower copper sleeve; 14 is the reducer; 15 is the worm; 16 is the worm gear; 17 is the bearing; 18 is the bearing; 19 is the radial pin; 20 is the screw; 21 is the sealing ring. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0017] The following will describe in detail the die-changing arm with the functions of flipping and automatic clamping of the present invention in conjunction with the drawings.

[0018] As Figures 1-4As shown in the figure, the die-changing arm with flipping and automatic clamping functions according to the present invention includes an upper support seat 1, a middle support seat 2, and a lower support seat 3 that are fixedly arranged on the body of the press from top to bottom in sequence. An axially slidable longitudinal oil cylinder 8 is connected to the middle support seat 2. The piston rod 802 of the oil cylinder 9 is fixed to the lower support seat 3. The bottom of the cylinder of the oil cylinder 8 is located on the upper side of the middle support seat 2 and coaxially fixed with a guide rod 6. The guide rod 6 extends upward and is slidably supported and connected to the upper support seat 1. A multi-joint die-changing arm 5 is connected to the guide rod 6 near the oil cylinder 8 through a rotating seat 4. The multi-section die-changing arm in the present invention includes a plurality of joint arms that are foldable and telescopic and are connected by at least one joint. Its joint structure is the same as the joint structure of the die-changing arm in the patent specification of CN104108198A. The end 501 of the die-changing arm of the present invention is rotatably connected to a flipping arm 12, and a pneumatic clamping mechanism 9 for clamping workpieces is connected to the flipping arm 12. The telescopic movement of the oil cylinder 8 relative to the piston rod 801 drives the guide rod 6 to slide up and down along the upper support seat 1. The multi-joint die-changing arm 5 can drive the flipping arm 12 to telescopically translate to a specified workpiece position to clamp and place workpieces.

[0019] To facilitate adjusting the clamping direction and enabling the clamping mechanism to adapt to clamping workpieces in different directions or adjusting the direction when placing workpieces, a sleeve counterbore 1201 is provided at the end of the flipping arm 12 that is flip-connected to the end 501 of the die-changing arm. A bearing 17 is installed inside the sleeve counterbore 1201 that is sleeved with the end 501 of the die-changing arm to facilitate the rotation of the flipping arm 125. A worm gear 16 is rotatably connected to the circumferential part of the outer periphery of the end 501 of the die-changing arm corresponding to the end of the flipping arm 12 through a bearing 18. The worm gear 16 is fixed to the circumference of the end 5001 of the flipping arm through a plurality of bolts. A worm 15 driven by a speed reducer 14 is installed on the end 501 of the die-changing arm. The meshing movement of the worm 15 and the worm gear 16 realizes the rotation of the flipping arm 12, and the direction of the flipping arm 12 can be adjusted to clamp or place workpieces.

[0020] To facilitate the clamping mechanism 4 to clamp workpieces, the pneumatic clamping mechanism 9 includes a fixed clamping jaw 901 and a movable clamping jaw 902 that are fixed to the flipping arm 12. The movable clamping jaw 92 is connected to the piston rod 903 of the clamping oil cylinder 904. The cylinder body of the clamping oil cylinder 904 is fixed to the rotating arm 12, and the extending end of the piston rod 903 is fixed to the movable clamping jaw 902. Oil ports A and B are provided on the cylinder wall on both sides of the piston of the clamping oil cylinder to realize the movement of the piston rod. A compression spring 905 is also provided between the inner side of the bottom of the cylinder of the clamping oil cylinder 904 and the piston rod 903 to ensure that when the clamping oil cylinder is accidentally pressurized, the piston rod 903 is still under the action of the compression spring 905 to maintain the clamping state, playing a safety protection role.

[0021] To facilitate improving the load-bearing capacity at the connection between the die-changing arm 5 and the guide rod 6, a cylindrical roller bearing 4011, a thrust ball bearing 402, and a tapered roller bearing 403 are sequentially arranged from top to bottom at the part where the rotating seat 4 is rotatably connected to the guide rod 6. A spacer sleeve 406 for the upper and lower bearings to abut against is circumferentially fitted on the guide rod 6 between the thrust ball bearing 402 and the tapered roller bearing 403. An upper cover 404 and a lower cover 405 are respectively provided at the upper and lower ends of the rotating seat 4, and the upper cover 404 and the lower cover 405 are fixedly connected to the rotating seat 4 circumferentially through a plurality of bolts. In the above-mentioned rotating connection structure between the rotating seat 4 and the guide rod 6, the cylindrical roller bearing 401 has a relatively high radial load-bearing capacity, the middle thrust ball bearing 402 is specifically used to bear the axial load to improve the load-bearing capacity when the die-changing arm 5 is translated and folded, and the following is the tapered roller bearing 403, which can bear a heavier combined radial and axial load. Therefore, compared with the linear slide rail mechanism driven by a hydraulic cylinder, the lifting structure of the present invention has a stronger load-bearing capacity and is suitable for handling heavier workpieces.

[0022] For the lifting and sliding of the sliding guide rod 6, the upper support seat 1 is provided with an installation hole for penetrating and installing the guide rod 6, and an upper copper sleeve 7 is fixedly arranged inside the installation hole. The upper copper sleeve 7 is axially slidably installed with the guide rod 6; a lower copper sleeve 13 is provided at the part where the middle support seat 2 is slidably connected to the oil cylinder 8, and the lower steel sleeve 13 is fixedly connected to the corresponding installation hole of the middle support seat 2.

[0023] To facilitate the fitting connection between the oil cylinder 8 and the guide rod 6, the end of the guide rod 6 connected to the oil cylinder 8 axially extends into the oil cylinder 8 and is fixedly connected to the oil cylinder 8 circumferentially through a plurality of radial pins 19 and screws 20. A shoulder 601 for abutting is provided between the extending end of the guide rod 6 and the inner circumference of the oil cylinder 8. The extending end of the guide rod at the end of the shoulder 601 is in sealing fit with the oil cylinder 8 and is provided with a sealing ring 21. In this way, an oil cavity on the upper side of the piston is formed between the end part of the guide rod, the oil cylinder, and the piston. The oil ports C and D for the oil to enter and exit the oil cavities on both sides of the piston are located on the lower side of the oil cylinder.

[0024] In the structure of the die-changing arm 5 of the present invention, a flipping arm 12 and a pneumatic clamping mechanism 9 are arranged at the end 501 of the die-changing arm. The direction of the clamping jaws of the pneumatic clamping mechanism is adjusted by the flipping of the flipping arm 12, which is convenient for clamping the upper die and the lower die or materials in different directions. Then, the height of the die-changing arm can be adjusted by driving the lifting of the die-changing arm 4 by the oil cylinder. The multi-joint die-changing arm structure can conveniently implement the folding, telescoping, and translation functions of the arm, realize the translation and handling after clamping, and directly flip the direction while clamping when reaching the designated position, and place the material at the designated position, eliminating the operation links of replacing the clamping tooling and mobilizing the lifting tooling, greatly improving the die-changing efficiency. At the same time, during the handling and translation process, the mold is always clamped by the pneumatic clamping tooling, which can prevent the mold from falling during the handling process and causing problems such as personal injury accidents.

Claims

1. A die-changing arm with flipping and automatic clamping functions, characterized in that, It includes an upper support seat, a middle support seat, and a lower support seat that are fixedly connected to the fuselage and arranged in sequence from top to bottom. A longitudinally arranged oil cylinder is axially slidably connected to the middle support seat. The piston rod of the oil cylinder is fixed to the lower support seat. The bottom of the cylinder of the oil cylinder is located above the middle support seat and coaxially fixed with a guide rod. The guide rod extends upward and is slidably supported and connected to the upper support seat. A multi-joint die-changing arm is connected to the guide rod near the oil cylinder through a rotating seat. The end of the die-changing arm is rotatably connected to a flipping arm, and a pneumatic clamping mechanism for clamping workpieces is connected to the flipping arm. The telescopic movement of the oil cylinder relative to the piston rod drives the guide rod to slide up and down along the upper support seat, and the multi-joint die-changing arm can drive the flipping arm to telescopically translate to a specified workpiece position for clamping.

2. The die-changing arm with flipping and automatic clamping functions according to claim 1, wherein, The end of the flipping arm that is flip-connected to the end of the die-changing arm is provided with a set-sunk hole. A bearing is installed inside the set-sunk hole sleeved with the end of the die-changing arm to facilitate the rotation of the flipping arm. A worm gear is rotatably connected to the circumferential corresponding part of the outer periphery of the die-changing arm and the end of the flipping arm through a bearing. The worm gear is fixed to the circumferential end of the flipping arm through a number of bolts. A worm driven by a speed reducer is installed on the die-changing arm. The meshing movement of the worm and the worm gear realizes the rotation of the flipping arm to adjust the direction of the flipping arm to clamp or place the workpiece.

3. The die-changing arm with flipping and automatic clamping functions according to claim 1, characterized in that, The pneumatic clamping mechanism includes a fixed clamping jaw and a movable clamping jaw that are fixed to the flipping arm. The movable clamping jaw is connected to the piston rod of the clamping oil cylinder. The cylinder body of the clamping oil cylinder is fixed to the rotating arm, and the extending end of the piston rod is fixed to the movable clamping jaw. A compression spring is also provided between the inner side of the bottom of the clamping oil cylinder and the piston rod.

4. The die-changing arm with flipping and automatic clamping functions according to claim 1, characterized in that, The parts where the rotating seat is rotatably connected to the guide rod are sequentially provided with a cylindrical roller bearing, a thrust ball bearing, and a tapered roller bearing from top to bottom. A spacer sleeve for the upper and lower bearings to abut against is circumferentially embedded in the guide rod between the thrust ball bearing and the tapered roller bearing. An upper cover and a lower cover are respectively provided at the upper end and the lower end of the rotating seat, and the upper cover and the lower cover are circumferentially fixed to the rotating seat through a number of bolts.

5. The die-changing arm with flipping and automatic clamping functions according to claim 1, characterized in that, The upper support seat is provided with an installation hole for penetrating and installing the guide rod. An upper copper sleeve is fixedly installed inside the installation hole, and the upper copper sleeve is axially slidably installed with the guide rod. A lower copper sleeve is provided at the sliding connection part between the middle support seat and the oil cylinder, and the lower copper sleeve is fixed to the corresponding installation hole of the middle support seat.

6. The die-changing arm with flipping and automatic clamping functions according to claim 1, wherein, The end of the guide rod connected to the oil cylinder axially extends into the oil cylinder and is circumferentially fixed to the oil cylinder through a number of radial pins and screws. A abutting shoulder is provided between the extending end of the guide rod and the inner circumference of the oil cylinder. The extending end of the guide rod at the end of the shoulder is hermetically fitted with the oil cylinder and is provided with a sealing ring.

7. The die-changing arm with flipping and automatic clamping functions according to claim 1, characterized in that, The die-changing arm includes a plurality of joint arms that are foldable and telescopic and connected by at least one joint.

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