Device for automatically assembling O-shaped sealing ring of hydraulic oil cylinder

Abstract

The utility model provides a hydraulic oil cylinder O-shaped sealing ring automatic assembling device, which comprises a feeding device, a positioning device, a paw mechanism and a transmission device, the feeding device comprises a rotary material disc, a material frame and a feeding table, and the positioning device comprises a Y-axis linear sliding table and a Z-axis linear sliding table. Through the feeding device, the positioning device, the gripper mechanism and the conveying device, the assembly quality is improved, damage to the sealing element in the assembly process is completely avoided, meanwhile, the production efficiency is remarkably improved, unmanned assembly is completely achieved, dependence on high-skill operators is reduced, the labor cost is reduced, and the production efficiency is improved. And moreover, automatic control over the whole O-shaped sealing ring assembling process can be achieved through PLC programming, the automatic assembling device can be widely applied to automatic assembling of O-shaped sealing rings on hydraulic oil cylinder pistons or guide sleeves of different specifications and models, and the automatic assembling device has the advantages of being easy and convenient to operate, efficient in assembling, high in adaptability, stable and reliable.

Description

Technical Field

[0001] The utility model relates to the technical field of automatic assembly, in particular to a device for automatically assembling O-ring seals of hydraulic cylinders. Background Technique

[0002] A hydraulic cylinder is a hydraulic actuator that converts hydraulic energy into mechanical energy and performs linear reciprocating motion (or oscillating motion). It has a simple structure and reliable operation. It consists of a cylinder barrel and a cylinder head, a piston and a piston rod, a sealing device, a buffer device and an exhaust device. When using it to achieve reciprocating motion, a speed reduction device can be omitted, and there is no transmission gap, and the motion is stable. Therefore, it is widely used in the hydraulic systems of various machines;

[0003] As a commonly used actuator in industry, the assembly quality of the O-ring seal on the piston or guide sleeve of a hydraulic cylinder is directly related to the sealing performance and service life of the cylinder. The traditional assembly process usually relies on manual operation, which is not only inefficient but also prone to improper installation or damage to the seal ring, resulting in unstable product quality. Content of the Utility Model

[0004] The purpose of the utility model is to provide a device for automatically assembling O-ring seals of hydraulic cylinders to solve the problems raised in the above background technique.

[0005] To achieve the above purpose, the utility model provides the following technical solutions:

[0006] A device for automatically assembling O-ring seals of hydraulic cylinders includes a feeding device, a positioning device, a gripper mechanism and a transmission device;

[0007] The feeding device includes a rotating turntable, a rack and a loading table;

[0008] The positioning device includes a Y-axis linear slide and a Z-axis linear slide. The Y-axis linear slide is fixed on the surface of the loading table, the Z-axis linear slide is arranged on the slider of the Y-axis linear slide, and the gripper mechanism is arranged on the slider of the Z-axis linear slide;

[0009] The gripper mechanism includes a base, a ball screw, a parallelogram link mechanism, a linear guide rail, a bracket, a small cylinder, a semi-embedded ejection mechanism and a nut. The base is fixed on the slider of the Z-axis linear slide. The ball screw is rotationally arranged on the bracket through a motor. The nut is threadedly connected to the surface of the ball screw. The linear guide rail is fixed on the surface of the base. The bracket is installed on the surface of the slider of the linear guide rail, and the bracket is connected to the nut through a parallelogram link mechanism. The small cylinder and the semi-embedded ejection mechanism are both arranged on the bracket, and the semi-embedded ejection mechanism is connected to the output end of the small cylinder;

[0010] The transmission device includes a conveyor belt and a tray. The tray is placed between two conveyor belts, and the conveyor belts are arranged on one side of the loading table.

[0011] Preferably, the rotary turntable is fixedly arranged on the surface of the loading table, and the rack is arranged on the rotary turntable.

[0012] Preferably, the rotary turntable is fixed to the bottom of the loading table through a lifting device. A through groove is arranged on the surface of the loading table. The rack is fixed to the rotary turntable, and one end of the rack penetrates through the through groove.

[0013] Preferably, the feeding device further includes a picking mechanism, and the picking mechanism is arranged on the surface of the loading table.

[0014] Preferably, the parallelogram link mechanism includes a connecting arm and a connecting seat. The connecting seat is fixed to the surface of the bracket, and both ends of the connecting arm are hinged to the connecting seat and the nut respectively.

[0015] Preferably, the semi-embedded ejection mechanism includes a first claw, a top block and a traction seat. The first claw is arranged at the bottom of the bracket. The top block is embedded inside the bracket and fits on the surface of the first claw. The traction seat is fixed to the output end of the small cylinder, and the top of the top block is connected to the surface of the traction seat.

[0016] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0017] Through the feeding device, positioning device, gripper mechanism and transmission device, the present utility model improves the assembly quality, completely avoids damage to the sealing parts during the assembly process, significantly improves the production efficiency, fully realizes unmanned assembly, reduces the dependence on highly skilled operators, reduces the labor cost, and can realize the automatic control of the entire O-ring assembly process through PLC programming. It can be widely applied to the automatic assembly of O-rings on hydraulic cylinder pistons or guide sleeves of different specifications and models, and has the characteristics of simple operation, high assembly efficiency, strong adaptability, stability and reliability. Description of the Drawings

[0018] Figure 1 Schematic diagram of the assembly of O-rings in the prior art;

[0019] Figure 2 Schematic diagram of the main structure of the present utility model;

[0020] Figure 3 Schematic diagram of the side structure of the gripper mechanism of the present utility model;

[0021] Figure 4 Schematic diagram of the main structure of the second embodiment of the present utility model;

[0022] Figure 5 Schematic diagram of the composition of the automatic assembly system of the present utility model;

[0023] Figure 6 Schematic diagram of the principle of controlling the position accuracy of the O-ring assembly of the present utility model;

[0024] Figure 7 Schematic diagram of the cooperation structure between the assembly device and the feeding device of the present utility model;

[0025] Figure 8 Schematic diagram of the main structure of the assembly device of the present utility model;

[0026] Figure 9 Schematic diagram of the main structure of the fingertip of the present utility model.

[0027] In the figure: 1. Feeding device; 11. Rotary turntable; 12. Rack; 13. Loading table; 2. Positioning device; 21. Y-axis linear slide; 22. Z-axis linear slide; 3. Gripper mechanism; 31. Base; 32. Ball screw; 33. Parallelogram linkage mechanism; 331. Connecting arm; 332. Connecting seat; 34. Linear guide rail; 35. Bracket; 36. Small cylinder; 37. Semi-embedded ejection mechanism; 371. First claw; 372. Ejecting block; 373. Traction seat; 38. Nut; 4. Transmission device; 41. Conveyor belt; 42. Tray; 5. Pick-up mechanism; 6. Lifting device; 7. Assembly device; 71. Pushing cylinder; 72. Mounting plate; 73. Pushing plate; 74. Second claw; 8. Feeding device; 81. Electric four-jaw; 82. Fingertip. Specific implementation mode

[0028] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative efforts fall within the protection scope of the present utility model.

[0029] Please refer to Figure 1 , Figure 1 which is a scheme for assembling an O-ring in the prior art.

[0030] Please refer to Figures 2-6 , the present utility model provides a device for automatically assembling an O-ring of a hydraulic cylinder, including a feeding device 1, a positioning device 2, a gripper mechanism 3 and a transmission device 4.

[0031] The feeding device 1 includes a rotary tray 11, a material rack 12 and a loading table 13. The rotary tray 11 is fixedly arranged on the surface of the loading table 13. The material rack 12 is arranged on the rotary tray 11. The feeding device 1 further includes a material taking mechanism 5, and the material taking mechanism 5 is arranged on the surface of the rotary tray 11.

[0032] Please refer to Figure 2 , the rotary tray 11 can drive the material rack 12 to rotate. After the material rack 12 releases the O-ring, the O-ring falls onto the material taking mechanism 5 under the action of gravity. At this time, the material taking mechanism 5 operates to send the O-ring in the direction close to the positioning device 2, so as to facilitate the gripper mechanism 3 to take the material. The material rack 12 can store O-rings and open support rings of various specifications. When the production line switches models, the feeding of the current specification can be stopped immediately, and the sealing parts of the next specification can be switched.

[0033] The positioning device 2 includes a Y-axis linear slide 21 and a Z-axis linear slide 22. The Y-axis linear slide 21 is fixed on the surface of the loading table 13. The Z-axis linear slide 22 is arranged on the slider of the Y-axis linear slide 21. The gripper mechanism 3 is arranged on the slider of the Z-axis linear slide 22.

[0034] Please refer to Figure 2 , the Y-axis linear slide 21 and the Z-axis linear slide 22 can move the gripper mechanism 3 in the Y-axis and Z-axis directions, so as to complete the whole process of the gripper mechanism 3 taking the material and installing the O-ring. The Y-axis linear slide 21 is responsible for transporting the gripper mechanism 3 between the loading table 13 and the assembly position, and the Z-axis linear slide 22 is responsible for the vertical movement of the gripper mechanism 3 when taking the material and assembling.

[0035] The gripper mechanism 3 includes a base 31, a ball screw 32, a parallelogram linkage mechanism 33, a linear guide 34, a bracket 35, a small cylinder 36, a semi-embedded ejection mechanism 37, and a nut 38. The base 31 is fixed to the slider of the Z-axis linear slide 22. The ball screw 32 is rotationally arranged on the bracket 35 by a motor. The nut 38 is threadedly connected to the surface of the ball screw 32. The linear guide 34 is fixed to the surface of the base 31. The bracket 35 is installed on the slider surface of the linear guide 34, and the bracket 35 is connected to the nut 38 through the parallelogram linkage mechanism 33. The small cylinder 36 and the semi-embedded ejection mechanism 37 are both arranged on the bracket 35. The semi-embedded ejection mechanism 37 is connected to the output end of the small cylinder 36. The parallelogram linkage mechanism 33 includes a connecting arm 331 and a connecting seat 332. The connecting seat 332 is fixed to the surface of the bracket 35. The two ends of the connecting arm 331 are respectively hinged to the connecting seat 332 and the nut 38. The semi-embedded ejection mechanism 37 includes a first claw 371, a top block 372, and a traction seat 373. The first claw 371 is arranged at the bottom of the bracket 35. The top block 372 is embedded inside the bracket 35 and fits on the surface of the first claw 371. The traction seat 373 is fixed to the output end of the small cylinder 36. The top of the top block 372 is connected to the surface of the traction seat 373.

[0036] Please refer to Figure 3 , when picking up the material, the motor drives the ball screw 32 to rotate. When the ball screw 32 rotates, it drives the nut 38 to move upward. When the nut 38 moves, it drives the top end of the connecting arm 331 to move upward. Since the overall length of the connecting arm 331 is fixed, after the top end of the connecting arm 331 moves upward, its bottom end can pull the bracket 35 to move centripetally on the surface of the linear guide 34 through the connecting seat 332. At this time, the first claws 371 at the bottom of the bracket 35 move centripetally until the outer diameter of the six first claws 371 is smaller than the inner diameter of the O-ring. Then, the first claws 371 are driven by the Z-axis linear slide 22 to extend into the O-ring. At this time, the motor is driven to rotate in the reverse direction, and the nut 38 moves downward on the surface of the ball screw 32. The outer diameters of the six first claws 371 gradually expand to expand the O-ring, thus realizing the grasping of the O-ring.

[0037] The transmission device 4 includes a conveyor belt 41 and a tray 42. The tray 42 is placed between the two conveyor belts 41. The conveyor belt 41 is arranged on one side of the loading table 13.

[0038] Please refer to Figure 2, when assembling the O-ring, the piston or guide sleeve of the hydraulic cylinder needs to be placed on the tray 42 of the conveyor belt 41. The conveyor belt 41 is responsible for transporting the tray 42 to the assembly position. Then, the positioning mechanism under the tray 42 is ejected under the actuation of the air cylinder. After positioning the tray 42 in cooperation with the positioning holes at the bottom of the tray 42, through the Y-axis linear slide, six first claws 371 move the O-ring above the tray 42. Then, the O-ring is positioned on the groove surface of the piston or guide sleeve through the Z-axis linear slide 22. At this time, the small air cylinder 36 is started. The small air cylinder 36 can drive the top block 372 to move downward through the traction seat 373. The top block 372 can push the O-ring from the top of the O-ring from the bottom of the first claw 371 into the groove, thus completing the assembly of the O-ring.

[0039] In this embodiment, the feeding device 1, the positioning device 2, the gripper mechanism 3 and the transmission device 4 are controlled by the PLC to achieve unmanned assembly.

[0040] Embodiment 2

[0041] The rotary disk 11 is fixed at the bottom of the loading table 13. A through groove is provided on the surface of the loading table 13. The rack 12 is fixed on the rotary disk 11. The lifting device 6 rises and falls at a fixed position.

[0042] In this embodiment, the O-rings are stacked on the rack 12. When an O-ring of a certain specification needs to be installed, the rotary disk 11 rotates to the position directly above the lifting device 6. The lifting device 6 lifts the rack 12 to a certain height according to the set value. The upper material taking mechanism 5 takes away the topmost rack 12 and places it in a suitable position for the gripper mechanism 3 to grab.

[0043] Embodiment 3

[0044] In this embodiment, the open phenolic resin support ring can also be automatically assembled by adopting the technical solution in Embodiment 1.

[0045] Embodiment 4

[0046] Please refer to Figures 7-9 , in this embodiment, a new feeding device 8 and an assembly device 7 are provided. The feeding device 8 includes an electric four-jaw 81 and fingertips 82, where the fingertips 82 are fixed on the surface of the electric four-jaw 81. The assembly device 7 includes a pushing cylinder 71, a mounting plate 72, a pushing plate 73 and a second claw 74. The pushing cylinder 71 is fixed on the surface of the mounting plate 72. The second claw 74 is fixed at the bottom of the mounting plate 72. The pushing plate 73 is fixed at the extending end of the pushing cylinder 71. The second claw 74 passes through the through hole on the pushing plate 73.

[0047] When assembling the O-ring, the electric four-jaw 81 drives the four fingertips 82 to move centripetally. The external device puts the O-ring on the four fingertips 82. At this time, the electric four-jaw 81 drives the four fingertips 82 to move centrifugally, stretching the diameter of the O-ring. At this time, the assembly device 7 installed on the robot is sent above the feeding device 6, and the second jaw 74 is vertically lowered into the interior of the four fingertips 82. The electric four-jaw 81 drives the four fingertips 82 to move centripetally again. Each fingertip 82 can pass through the slot of the second jaw 74, and the outer diameter of the O-ring gradually shrinks until it is clamped on the second jaw 74. The robot carries the assembly device and moves to directly above the oil cylinder piston or the guide sleeve. The second jaw 74 aligns with the center of the oil cylinder piston or the guide sleeve and moves down to the groove. After reaching the position, the push cylinder 71 acts, and the push plate 73 moves down relative to the second jaw 74. The O-ring is pushed out and enters the groove, and the assembly is completed.

[0048] Although the embodiments of the present invention have been shown and described, those skilled in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An automatic assembly device for O-ring seals of hydraulic cylinders, characterized in that: It includes a feeding device (1), a positioning device (2), a gripper mechanism (3) and a conveying device (4); The feeding device (1) includes a rotary turntable (11), a rack (12) and a loading table (13); The positioning device (2) includes a Y-axis linear slide (21) and a Z-axis linear slide (22). The Y-axis linear slide (21) is fixed on the surface of the loading table (13), the Z-axis linear slide (21) is arranged on the slider of the Y-axis linear slide (22), and the gripper mechanism (3) is arranged on the slider of the Z-axis linear slide (22); The gripper mechanism (3) includes a base (31), a ball screw (32), a parallelogram linkage mechanism (33), a linear guide rail (34), a bracket (35), a small cylinder (36), a semi-embedded ejection mechanism (37) and a nut (38). The base (31) is fixed on the slider of the Z-axis linear slide (22), the ball screw (32) is rotationally arranged on the bracket (35) by a motor, the nut (38) is threadedly connected to the surface of the ball screw (32), the linear guide rail (34) is fixed on the surface of the base (31), the bracket (35) is installed on the surface of the slider of the linear guide rail (34), and the bracket (35) is connected to the nut (38) through the parallelogram linkage mechanism (33). The small cylinder (36) and the semi-embedded ejection mechanism (37) are both arranged on the bracket (35), and the semi-embedded ejection mechanism (37) is connected to the output end of the small cylinder (36); The conveying device (4) includes a conveyor belt (41) and a tray (42). The tray (42) is placed between two conveyor belts (41), and the conveyor belt (41) is arranged on one side of the loading table (13).

2. The device for automatically assembling the O-ring of a hydraulic cylinder according to claim 1, wherein: The rotary turntable (11) is fixedly arranged on the surface of the loading table (13), and the rack (12) is arranged on the rotary turntable (11).

3. The device for automatically assembling the O-ring of a hydraulic cylinder according to claim 1, wherein: The rotary turntable (11) is fixed to the bottom of the loading table (13) through a lifting device (6). A through groove is arranged on the surface of the loading table (13). The rack (12) is fixed to the rotary turntable (11), and one end of the rack (12) penetrates through the through groove.

4. An apparatus for automatically assembling an O-ring of a hydraulic cylinder according to any one of claims 2 or 3, characterized in that: The feeding device (1) further includes a material taking mechanism (5), and the material taking mechanism (5) is arranged on the surface of the loading table (13).

5. The device for automatically assembling the O-ring of a hydraulic cylinder according to claim 1, characterized in that: The parallelogram linkage mechanism (33) includes a connecting arm (331) and a connecting seat (332). The connecting seat (332) is fixed on the surface of the bracket (35), and both ends of the connecting arm (331) are hinged to the connecting seat (332) and the nut (38) respectively.

6. The device for automatically assembling the O-ring of a hydraulic cylinder according to claim 1, wherein: The semi-embedded ejection mechanism (37) includes a first claw (371), a top block (372) and a traction seat (373). The first claw (371) is arranged at the bottom of the bracket (35), the top block (372) is embedded inside the bracket (35) and fits on the surface of the first claw (371), the traction seat (373) is fixed to the output end of the small cylinder (36), and the top of the top block (372) is connected to the surface of the traction seat (373).

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