Workpiece turning mechanism

Abstract

The utility model provides a turning mechanism for a workpiece, and belongs to the field of mechanical technology. It solves the problem of insufficient applicability. It includes a bracket with a mounting plate arranged vertically, a first gripper assembly and a second gripper assembly are respectively arranged on the front side of the mounting plate, a sliding frame is slidably connected to the front side of the mounting plate along the left and right directions, the first gripper assembly is connected to the sliding frame and the second gripper assembly is located on the right side of the first gripper assembly, a first cylinder connected to the sliding frame by a piston rod is connected to the bracket, the mounting plate has a long strip-shaped movable groove arranged along the left and right directions, a limit block is abutted against the front side of the mounting plate and a connecting block is abutted against the rear side thereof, the limit block and the connecting block are fixedly connected by a fastening screw, the fastening screw rod passes through the limit block and the movable groove and is threadedly connected in the connecting block, the sliding frame is integrally fixedly connected or fixedly connected with a blocking part, and the limit block is located on the movable path of the blocking part sliding to the right with the sliding frame. It has the advantages of wide applicability and high adjustment flexibility.

Description

Technical Field

[0001] The utility model belongs to the technical field of machinery and relates to a turning mechanism for a workpiece. Background Art

[0002] In existing machining, it is often encountered that both ends of the workpiece need to be processed. In order to realize the automatic turning of the workpiece in the machine to improve the processing efficiency, it is necessary to set up a flipping mechanism. For example, the patent application No. 201310421675.9 discloses an automatic production line flipping device, which includes a base plate, a front and rear sliding mechanism, a left and right sliding mechanism, a front and rear flipping mechanism and a right flipping mechanism. The front and rear sliding mechanism includes a front and rear sliding guide mechanism, a front and rear sliding drive mechanism and a support frame with a vertical upright plate. The sliding direction of the front and rear sliding guide mechanism is installed on the base plate in a front-to-back transverse direction. The support frame is supported and guided by the front and rear sliding guide mechanism. The front and rear sliding mechanism drive mechanism is connected to the support frame. The left and right sliding mechanism includes a transverse slide, a left and right sliding guide mechanism and a left and right sliding drive mechanism. The sliding direction of the left and right sliding guide mechanism is installed on the upright plate of the support frame in a left-right transverse direction. The transverse slide is supported and guided by the left and right sliding guide mechanism. The left and right sliding drive mechanisms are connected to the horizontal slide. The left flipping mechanism and the right flipping mechanism both include a workpiece clamping mechanism and a flipping mechanism. The flipping mechanism includes a flipping plate and a rotating drive mechanism. The two ends of the flipping plate are respectively connected to a connecting shaft. The axis lines of the two connecting shafts are coaxially arranged vertically. The connecting shaft is supported and installed through bearings and bearing seats. The rotating drive mechanism is connected to one of the connecting shafts. The workpiece clamping mechanism is installed on the front end surface of the flipping plate. The workpiece clamping mechanism is provided with a workpiece clamping opening. The left flipping mechanism is installed on the horizontal slide. The right flipping mechanism is fixedly installed on the support frame and is located on the right side of the left and right sliding guide mechanisms. When the workpiece clamping openings of the left flipping mechanism and the right flipping mechanism are opposite, the centers of the workpiece clamping openings are coaxial. Through the above arrangement, the automatic turning and flipping of the workpiece in the machine can be realized, which improves the processing efficiency.

[0003] Among them, the left and right sliding guide mechanism is a guide rail substructure, including two second guide rails separated by a certain distance from each other and a second slider slidably mounted on the second guide rails, the second guide rail is fixedly mounted on the vertical plate of the support frame, the second slider is connected to the horizontal slide, and the left and right sliding drive mechanism is a second cylinder, the cylinder body of the second cylinder is fixedly mounted on the vertical plate of the support frame, the piston rod of the second cylinder is fixedly connected to the horizontal slide, and the left and right sliding is achieved by extending or retracting the piston rod of the second cylinder. However, the stroke of the cylinder is not adjustable, resulting in the problem that the sliding distance of the horizontal slide cannot be adjusted and there is a problem of insufficient applicability in actual use. Utility Model Content

[0004] The purpose of the utility model is to propose a workpiece turning mechanism to solve the problem of insufficient applicability in view of the above problems existing in the prior art.

[0005] The purpose of the utility model can be achieved through the following technical solutions:

[0006] The flipping mechanism of the workpiece includes a bracket, the bracket has a mounting plate arranged vertically, and the front sides of the mounting plate are respectively provided with a first hand gripper assembly and a second hand gripper assembly, the front side of the mounting plate is slidably connected with a sliding frame along the left and right directions, the first hand gripper assembly is connected to the sliding frame and the second hand gripper assembly is located on the right side of the first hand gripper assembly, and the bracket is connected with a first cylinder connected with a piston rod and the sliding frame, characterized in that the mounting plate has a long movable groove arranged along the left and right directions, a limiting block is abutted against the front side of the mounting plate and a connecting block is abutted against the rear side thereof, the limiting block and the connecting block are fixedly connected by a fastening screw, the rod of the fastening screw passes through the limiting block and the movable groove and is threadedly connected in the connecting block, the sliding frame is integrally fixedly connected or fixedly connected with a blocking part, and the limiting block is located on the movable path where the blocking part slides to the right with the sliding frame.

[0007] When in use, tighten the fastening screws so that the limit block and the connecting block are firmly clamped on the front and back sides of the mounting plate, so that the limit block, the mounting plate and the connecting block are fixed together. The limit block is located under the active path of the blocking part sliding to the right with the sliding frame, which means that the maximum sliding distance of the sliding frame to the right can be limited by the abutment between the limit block and the blocking part. When it is necessary to reduce the maximum sliding distance of the sliding frame to the right, it is only necessary to loosen the fastening screws, and then adjust the limit block to the left to the required position by moving the fastening screws along the active groove and then tighten the fastening screws again. Through the above-mentioned settings, the adjustment of the sliding distance of the sliding frame is realized, so that the flip mechanism can be used for workpieces of different lengths, thereby improving applicability. Moreover, such a structure can also achieve stepless adjustment and can be adjusted to any position, with higher adjustment flexibility.

[0008] In the above-mentioned workpiece flipping mechanism, two pins are connected between the limit block and the connecting block. The two pins are located on both sides of the fastening screw and both pins pass through the movable groove. The two ends of the two pins are respectively inserted into the limit block and the connecting block. The pins are fixedly connected to the connecting block and the pins are clearance-matched with the limit block.

[0009] The two pins are located on both sides of the fastening screw and also pass through the movable groove, which can play a role in fixing the connecting block and the mounting plate circumferentially, so that when the fastening screw is rotated, the connecting block can be driven by the thread to clamp or loosen the mounting plate.

[0010] In addition, when the blocking portion abuts against the limit block, the sliding frame will generate a thrust on the limit block through the blocking portion. Generally speaking, the gap between the fastening screw and the limit block (the fastening screw only passes through the limit block) is relatively large. The existence of this gap may cause the limit block to be displaced relative to the connecting block when it is subjected to force. In this case, the bolt is susceptible to shear force. However, through the setting of the pin, because the pin and the limit block are clearance-matched, the gap between the two is obviously smaller than the gap between the fastening screw and the limit block. In this way, these two pins can be used to replace the fastening screw to withstand the shear force, thereby protecting the fastening screw.

[0011] In the above-mentioned workpiece flipping mechanism, the pin is a spring pin, the limit block has two assembly holes one, and the connecting block has two assembly holes two, the two ends of one pin are respectively inserted into one assembly hole one and one assembly hole two, and the two ends of another pin are respectively inserted into another assembly hole one and another assembly hole two, and the outer walls of the two pins form a tight fit with the hole walls of the corresponding assembly holes two.

[0012] In the above-mentioned workpiece turning mechanism, the blocking portion is block-shaped, the right side surface of the blocking portion is a plane, and the left side surface of the limiting block is a plane.

[0013] When the blocking portion and the limiting block are in contact with each other, the two are in surface contact, thus ensuring the reliability of limiting the sliding frame.

[0014] In the above-mentioned workpiece flipping mechanism, the upper and lower sides of the first gripper assembly respectively have first connecting shafts arranged vertically, and the two first connecting shafts are respectively rotatably arranged on the sliding frame, and the sliding frame is also connected to a second cylinder, one of the first connecting shafts is fixedly connected to a first swing block, and the piston rod of the second cylinder is connected to the first swing block. The sliding frame is also threaded with two first limit screws in the left and right directions, and the two first limit screws are parallel and have the same height, and the first swing block can swing from abutting against one of the first limit screws to abutting against the other first limit screw.

[0015] The swing angle of the first swing block is limited by the two first limit screws, so that the processing accuracy can be ensured. At the same time, the two first limit screws are threadedly connected to the sliding frame, that is, the entire swing angle of the first swing block can be fine-tuned by rotating the first limit screws, further ensuring the processing accuracy.

[0016] In the above-mentioned workpiece flipping mechanism, the upper and lower sides of the second gripper assembly respectively have second connecting shafts arranged vertically, and the two second connecting shafts are respectively rotatably arranged on the bracket, and the bracket is also connected to a third cylinder, one of the second connecting shafts is fixedly connected to a second swing block, and the piston rod of the third cylinder is connected to the second swing block. The bracket is also threaded with two second limit screws in the left and right directions, and the two second limit screws are parallel and have the same height, and the second swing block can swing from abutting against one of the second limit screws to abutting against the other second limit screw.

[0017] The swing angle of the second swing block is limited by the two second limit screws, so that the processing accuracy can be ensured. At the same time, the two second limit screws are threadedly connected to the bracket, that is, the entire swing angle of the second swing block can be fine-tuned by rotating the second limit screws, further ensuring the processing accuracy.

[0018] Compared with the prior art, the workpiece flipping mechanism of the present invention realizes the adjustment of the sliding distance of the sliding frame by setting a long strip-shaped movable groove on the mounting plate and combining the setting of the limit block and the blocking part, thereby being able to universally use workpieces of different lengths and improving applicability. Moreover, such a structure can also realize stepless adjustment and can be adjusted to any position. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the turning mechanism of this workpiece.

[0020] Figure 2 This is a schematic diagram of the flipping mechanism of the workpiece from another angle.

[0021] Figure 3 This is a schematic diagram of the flipping mechanism of the workpiece from another angle.

[0022] Figure 4 This is a schematic diagram of the workpiece flipping mechanism without the second gripper assembly.

[0023] Figure 5 It is a cross-sectional schematic diagram between the limit block and the mounting plate.

[0024] Figure 6 It is a schematic diagram of the sliding frame.

[0025] Figure 7 This is another angle diagram of the sliding frame.

[0026] Figure 8 It is a schematic diagram of the first gripper assembly and the second gripper assembly.

[0027] In the figure, 1, bracket; 1a, mounting plate; 1a1, movable groove; 2, first gripper assembly; 2a, first connecting shaft; 2b, first mounting plate; 2c, first clamping jaw; 3, second gripper assembly; 3a, second connecting shaft; 3b, second mounting plate; 3c, second clamping jaw; 4, sliding frame; 5, guide rail; 6, slider; 7, first cylinder; 8, limit block; 8a, assembly hole one; 9, connecting block; 9a, assembly hole two; 10, fastening screw; 11, blocking part; 12, pin; 13, second cylinder; 14, first swing block; 15, first limit screw; 16, third cylinder; 17, second swing block; 18, second limit screw. DETAILED DESCRIPTION

[0028] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

[0029] like Figure 1-Figure 4 As shown, the turning mechanism of the workpiece includes a bracket 1, the bracket 1 has a vertically arranged mounting plate 1a, the front side of the mounting plate 1a is respectively provided with a first gripper assembly 2 and a second gripper assembly 3, the front side of the mounting plate 1a is slidably connected with a sliding frame 4 along the left and right directions, the first gripper assembly 2 is connected to the sliding frame 4 and the second gripper assembly 3 is located on the right side of the first gripper assembly 2. Among them, two guide rails 5 are arranged in parallel on the front side of the mounting plate 1a, and sliders 6 are slidably arranged on both guide rails 5, the sliding frame 4 is fixedly connected to the front side of the two sliders 6, the bracket 1 is connected with a first cylinder 7, the piston rod end of the first cylinder 7 is connected to the sliding frame 4, the sliding frame 4 can be driven to slide toward the second gripper assembly 3 by the extension of the piston rod of the first cylinder 7, and the sliding frame 4 can be driven to move away from the second gripper assembly 3 by the retraction of the piston rod of the first cylinder 7.

[0030] like Figure 1 , Figure 4 , Figure 5 and Figure 7As shown, the mounting plate 1a has a long strip-shaped movable groove 1a1 arranged in the left-right direction, the front side of the mounting plate 1a is abutted against a limit block 8 and the rear side thereof is abutted against a connection block 9, the limit block 8 and the connection block 9 are fixedly connected by a fastening screw 10, the rod of the fastening screw 10 passes through the limit block 8 and the movable groove 1a1 and is threadedly connected in the connection block 9, the sliding frame 4 is integrally fixedly connected or fixedly connected with a blocking portion 11, and the limit block 8 is located on the movable path of the blocking portion 11 sliding rightward with the sliding frame 4. The blocking portion 11 is block-shaped, the right side surface of the blocking portion 11 is a plane, and the left side surface of the limit block 8 is a plane. Furthermore, two pins 12 are connected between the limit block 8 and the connection block 9. The two pins 12 are located on both sides of the fastening screw 10 and the two pins 12 pass through the movable groove 1a1. The two ends of the two pins 12 are respectively inserted into the limit block 8 and the connection block 9. The pins 12 are fixedly connected to the connection block 9 and the pins 12 are loosely matched with the limit block 8. In this embodiment, the pins 12 are specifically spring pins, the limit block 8 has two assembly holes 1 8a, and the connection block 9 has two assembly holes 2 9a. The two ends of one pin 12 are respectively inserted into one of the assembly holes 1 8a and one of the assembly holes 2 9a, and the two ends of the other pin 12 are respectively inserted into the other assembly hole 1 8a and the other assembly hole 2 9a, and the outer walls of the two pins 12 are respectively tightly matched with the hole walls of the corresponding assembly holes 2 9a.

[0031] Specifically, Figure 2 , Figure 6 , Figure 7 and Figure 8As shown, the upper and lower sides of the first gripper assembly 2 respectively have first connecting shafts 2a arranged vertically, and the two first connecting shafts 2a are respectively rotatably arranged on the sliding frame 4, and the sliding frame 4 is also connected to the second cylinder 13, one of the first connecting shafts 2a is fixedly connected to the first swing block 14, and the piston rod of the second cylinder 13 is connected to the first swing block 14, and the first swing block 14 can be driven to swing by extending or retracting the piston rod of the second cylinder 13, thereby realizing the flipping of the first gripper assembly 2, so that the first gripper assembly 2 can be switched between the forward setting and the rightward setting. The first gripper assembly 2 includes a first mounting plate 2b and a plurality of first clamps 2c slidably connected to the first mounting plate 2b and capable of approaching the center line of the first mounting plate 2b, and the two first connecting shafts 2a are respectively fixedly connected to the upper and lower sides of the first mounting plate 2b. The sliding frame 4 is also threadedly connected with two first limit screws 15 in the left-right direction. The two first limit screws 15 are parallel and have the same height. The first swing block 14 can swing from abutting against one of the first limit screws 15 to abutting against the other first limit screw 15. The swing angle of the first swing block 14 is limited by the two first limit screws 15, so that the processing accuracy can be guaranteed. At the same time, the two first limit screws 15 are threadedly connected to the sliding frame 4, that is, the entire swing angle of the first swing block 14 can be fine-tuned by rotating the first limit screws 15.

[0032] like Figure 3 and Figure 8As shown, the upper and lower sides of the second gripper assembly 3 respectively have second connecting shafts 3a arranged vertically, and the two second connecting shafts 3a are respectively rotatably arranged on the bracket 1, and the bracket 1 is also connected to the third cylinder 16, one of the second connecting shafts 3a is fixedly connected to the second swing block 17, and the piston rod of the third cylinder 16 is connected to the second swing block 17, and the second swing block 17 can be driven to swing by extending or retracting the piston rod of the third cylinder 16, thereby realizing the flipping of the second gripper assembly 3, so that the second gripper assembly 3 can be switched between the forward setting and the left setting. The second gripper assembly 3 includes a second mounting plate 3b and a plurality of second clamps 3c that are slidably connected to the second mounting plate 3b and can approach the center line of the second mounting plate 3b, and the two second connecting shafts 3a are respectively fixedly connected to the upper and lower sides of the second mounting plate 3b. The combination of the first mounting plate 2b and each first clamp 2c and the combination of the second mounting plate 3b and each second clamp are actually the existing hydraulic chuck structure. The bracket 1 is also threaded with two second limit screws 18 in the left-right direction. The two second limit screws 18 are parallel and have the same height. The second swing block 17 can swing from abutting against one of the second limit screws 18 to abutting against the other second limit screw 18. The swing angle of the second swing block 17 is limited by the two second limit screws 18, so that the processing accuracy can be guaranteed. At the same time, the two second limit screws 18 are threadedly connected to the bracket 1, that is, the entire swing angle of the second swing block 17 can be fine-tuned by rotating the second limit screws 18.

[0033] In the initial state, the first gripper assembly 2 and the second gripper assembly 3 are both in a forward setting state (at this time, the piston rod of the second cylinder 13 and the piston rod of the third cylinder 16 are both in an extended state), and the slide frame 4 is located at a position far away from the second gripper assembly 3 (at this time, the piston rod of the first cylinder 7 is in a retracted state). After the workpiece is processed, the truss manipulator clamps the processed workpiece and puts it into the first gripper assembly 2 for clamping. Then, the piston rod of the second cylinder 13 and the piston rod of the third cylinder 16 are retracted at the same time, so that the first gripper assembly 2 switches to the right and the second gripper assembly 3 switches to the left, so that the first gripper assembly 2 and the second gripper assembly 3 are opposite to each other. Then, the piston rod of the first cylinder 7 extends and drives the slide frame 4 to slide, so that the workpiece clamped on the first gripper assembly 2 is transported to the second gripper assembly 3, and then the second gripper assembly 3 is controlled to clamp the workpiece and the first gripper assembly 2 is controlled to release the workpiece. Finally, the piston rod of the first cylinder 7 retracts and drives the sliding frame 4 to reset to the left, and then the piston rod of the second cylinder 13 and the piston rod of the third cylinder 16 extend simultaneously, so that the first gripper assembly 2 and the second gripper assembly 3 are switched back to the forward state, thereby completing the U-turn of the workpiece and waiting for the robot to grab it on the second gripper assembly 3.

[0034] The turning mechanism of the workpiece can adjust the maximum sliding distance of the sliding frame 4 to adapt to workpieces of different lengths. Specifically, when in use, tighten the fastening screw 10 so that the limit block 8 and the connecting block 9 are firmly clamped on the front and rear sides of the mounting plate 1a, so that the limit block 8, the mounting plate 1a and the connecting block 9 are fixed together. The limit block 8 is located under the active path of the blocking portion 11 sliding to the right with the sliding frame 4, which means that the maximum sliding distance of the sliding frame 4 to the right can be limited by the abutment between the limit block 8 and the blocking portion 11. When it is necessary to reduce the maximum sliding distance of the sliding frame 4 to the right, it is only necessary to loosen the fastening screw 10, and then adjust the limit block 8 to the left to the required position by moving the fastening screw 10 along the active groove 1a1, and then tighten the fastening screw 10 again. Through the above arrangement, the adjustment of the sliding distance of the sliding frame 4 is realized, so that the turning mechanism can be used for workpieces of different lengths, and the applicability is improved. Moreover, such a structure can also realize stepless adjustment and can be adjusted to any position.

[0035] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways, but they will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

Claims

1. A workpiece turning mechanism, comprising a bracket (1), wherein the bracket (1) has a mounting plate (1a) arranged vertically, a first gripper assembly (2) and a second gripper assembly (3) are arranged on the front side of the mounting plate (1a), a sliding frame (4) is slidably connected to the front side of the mounting plate (1a) in the left-right direction, the first gripper assembly (2) is connected to the sliding frame (4) and the second gripper assembly (3) is located on the right side of the first gripper assembly (2), a first cylinder (7) connected to the piston rod and the sliding frame (4) is connected to the bracket (1), characterized in that: The mounting plate (1a) has a long movable groove (1a1) arranged in the left-right direction, a limit block (8) is arranged against the front side of the mounting plate (1a) and a connecting block (9) is arranged against the rear side thereof, the limit block (8) and the connecting block (9) are fixedly connected by a fastening screw (10), the rod of the fastening screw (10) passes through the limit block (8) and the movable groove (1a1) and is threadedly connected in the connecting block (9), the sliding frame (4) is integrally fixedly connected or fixedly connected with a blocking portion (11), and the limit block (8) is located on the movable path of the blocking portion (11) sliding to the right along with the sliding frame (4).

2. The workpiece turning mechanism according to claim 1, characterized in that: Two pins (12) are also connected between the limit block (8) and the connecting block (9). The two pins (12) are located on both sides of the fastening screw (10) and both pins (12) pass through the movable groove (1a1). Both ends of the two pins (12) are respectively inserted into the limit block (8) and the connecting block (9). The pins (12) and the connecting block (9) are fixedly connected and the pins (12) and the limit block (8) are clearance-matched.

3. The workpiece turning mechanism according to claim 2, characterized in that: The pin (12) is a spring pin, the limit block (8) has two assembly holes (8a), and the connecting block (9) has two assembly holes (9a), wherein the two ends of one pin (12) are respectively inserted into one of the assembly holes (8a) and one of the assembly holes (9a), and the two ends of another pin (12) are respectively inserted into another assembly hole (8a) and another assembly hole (9a), and the outer walls of the two pins (12) are respectively tightly fitted with the hole walls of the corresponding assembly holes (9a).

4. The workpiece turning mechanism according to claim 1, 2 or 3, characterized in that: The blocking portion (11) is block-shaped, the right side surface of the blocking portion (11) is a plane, and the left side surface of the limiting block (8) is a plane.

5. The workpiece turning mechanism according to claim 1, 2 or 3, characterized in that: The first gripper assembly (2) has first connecting shafts (2a) arranged vertically on the upper and lower sides respectively. The two first connecting shafts (2a) are rotatably arranged on the sliding frame (4). The sliding frame (4) is also connected to a second cylinder (13). One of the first connecting shafts (2a) is fixedly connected to a first swing block (14). The piston rod of the second cylinder (13) is connected to the first swing block (14). The sliding frame (4) is also threadedly connected to two first limit screws (15) in the left-right direction. The two first limit screws (15) are parallel and have the same height. The first swing block (14) can swing from abutting against one of the first limit screws (15) to abutting against the other first limit screw (15).

6. The workpiece turning mechanism according to claim 1, 2 or 3, characterized in that: The second gripper assembly (3) has vertically arranged second connecting shafts (3a) on the upper and lower sides respectively, and the two second connecting shafts (3a) are rotatably arranged on the bracket (1). The bracket (1) is also connected to a third cylinder (16), one of the second connecting shafts (3a) is fixedly connected to a second swing block (17), and the piston rod of the third cylinder (16) is connected to the second swing block (17). The bracket (1) is also threadedly connected to two second limit screws (18) in the left and right directions, and the two second limit screws (18) are parallel and have the same height, and the second swing block (17) can swing from abutting against one of the second limit screws (18) to abutting against the other second limit screw (18).

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