Spring press fitting and coaxiality correcting device for oil cylinder piston rod assembly

Abstract

The utility model provides an oil cylinder piston rod assembly spring press fitting and coaxiality correcting device which comprises a clamping device, a guide tool, a coaxiality pressing device, a positioning device and a controller, and the clamping device comprises a first mechanical arm and grabbing fingers. Through the arrangement of the clamping device and the cooperation of the controller, rapid installation of the compression spring can be achieved, the production efficiency is greatly improved, in the process, the coaxiality between the compression spring and the spacer bush can be ensured through the arrangement of the coaxiality pressing device, and the production efficiency is improved. After high-precision coaxiality is guaranteed, a relative gap is kept when the compression spring and the spacer bush assembly are matched with the piston rod, mechanical damage to the piston rod in the assembling and using process is avoided, unmanned assembling is completely achieved, dependence on high-skill operators is reduced, the labor cost is reduced, a strict control system and a high-precision calibration device are arranged, and the production efficiency is improved. The assembly quality is greatly improved; and the service life of a product is greatly prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of hydraulic oil cylinders, in particular to a spring press-fitting and coaxiality correction device for an oil cylinder piston rod assembly. Background Art

[0002] In a single-acting cylinder, the cylinder is reset by a compression spring installed in the lever cavity. The compression spring is installed on the spacer sleeve and combined with the piston end face to transmit elastic kinetic energy to achieve the function of cylinder retraction and reset. When the compression spring is installed, the center of the hole needs to pass through the piston rod. The surface of the piston rod is usually very smooth and chrome-plated to ensure that a good sealing surface is formed with the cylinder guide sleeve during use. In order to prevent mechanical damage to the piston rod during installation and use, the compression spring and the spacer sleeve must maintain coaxiality during installation. However, traditional manual installation methods have various defects, which can easily cause mechanical damage to the piston rod and affect the performance and life of the cylinder. Utility Model Content

[0003] The utility model aims to provide a spring press-fitting and coaxiality correction device for a cylinder piston rod assembly to solve the problems raised in the above-mentioned background technology.

[0004] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0005] A spring press-fitting and coaxiality correction device for a cylinder piston rod assembly, comprising a clamping device, a guide fixture, a coaxiality pressing device, a positioning device and a controller;

[0006] The gripping device comprises a first mechanical arm and a gripping finger, wherein the gripping finger is mounted at the end of the first mechanical arm;

[0007] The positioning device comprises a workbench and a positioning tool, and the positioning tool is installed on the surface of the workbench;

[0008] The coaxiality pressing device comprises a bracket, a cylinder and a first coaxiality pressing tool, wherein the bracket is arranged on the surface of the workbench, the cylinder is installed on the surface of the bracket, and the first coaxiality pressing tool is installed on the output end of the cylinder;

[0009] The first robotic arm, the gripping fingers and the cylinder are all electrically connected to the controller.

[0010] Preferably, the positioning device further comprises a tooling base, which is fixed to the surface of the workbench and is located on one side of the positioning tooling.

[0011] Preferably, a sensor is installed on the grasping finger, and the sensor is electrically connected to the controller.

[0012] Preferably, the inner wall of the first coaxial pressing tool is provided with an inner column, the top of the guide tool is provided with an inner hole, the bottom of the inner column is plugged into the inside of the inner hole, and the bottom of the guide tool is provided with a small-diameter cylinder.

[0013] Preferably, the inner wall of the first coaxiality pressing tool is provided with an outer cylindrical portion, and the first coaxiality pressing tool ensures the coaxiality by cooperating with the outer circle of the spring through the outer cylindrical portion.

[0014] Preferably, the coaxiality pressing device further comprises a second mechanical arm and a second coaxiality pressing tool, and the second coaxiality pressing tool is installed at the end of the second mechanical arm.

[0015] Compared with the prior art, the beneficial effects of the utility model are:

[0016] The utility model discloses that through the setting of the clamping device, in cooperation with the controller, the compression spring can be quickly installed, thereby greatly improving the production efficiency. In this process, through the setting of the coaxiality pressing device, the coaxiality between the compression spring and the spacer sleeve can be ensured, and the compression spring and the spacer sleeve assembly after high-precision coaxiality will maintain a relative gap when cooperating with the piston rod, thus avoiding mechanical damage to the piston rod during assembly and use, completely realizing unmanned assembly, reducing the dependence on highly skilled operators, and reducing labor costs. The strict control system and high-precision calibration device greatly improve the assembly quality and product service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the installation of a compression spring and a spacer in the prior art;

[0018] Figure 2 It is a schematic diagram of the main structure of the utility model;

[0019] Figure 3 This is a schematic diagram of the connection structure between the positioning tool and the spacer sleeve of the utility model;

[0020] Figure 4 This is a schematic diagram of the connection structure between the guide tooling and the spacer sleeve of the utility model;

[0021] Figure 5 This is a schematic diagram of the connection structure between the first coaxial pressing tool and the spacer sleeve of the utility model;

[0022] Figure 6 This is a schematic diagram of the main structure of the second embodiment of the present utility model;

[0023] Figure 7 This is the principle diagram of the automatic control system of the utility model.

[0024] In the figure: 1. Clamping device; 11. First robot arm; 12. Grasping finger; 13. Sensor; 2. Guide tooling; 21. Inner hole; 22. Small diameter cylinder; 3. Coaxial pressing device; 31. Bracket; 32. Cylinder; 33. First coaxial pressing tooling; 331. Inner column; 332. Outer cylindrical portion; 34. Second robot arm; 35. Second coaxial pressing tooling; 4. Positioning device; 41. Workbench; 42. Positioning tooling; 43. Spacer; 431. Round hole; 44. Tooling base; 5. Compression spring. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the utility model.

[0026] See also Figure 1 , Figure 1 It is a schematic diagram of the installation of the compression spring 5 and the spacer sleeve 43 in the prior art.

[0027] See also Figure 2-7 The utility model provides a spring pressing and coaxiality correction device for a cylinder piston rod assembly, comprising a clamping device 1, a guide tool 2, a coaxiality pressing device 3, a positioning device 4 and a controller;

[0028] The clamping device 1 is used to clamp the spacer 43, the guide fixture 2 and the compression spring 5 in steps, and place them on the positioning fixture 42. The clamping device 1 has multi-degree-of-freedom operation capabilities to ensure high-precision clamping and placement. The guiding work plays a guiding role for the compression spring 5 to ensure that the compression spring 5 is in a vertically placed posture and provides positioning assistance for the pressing action. The coaxial pressing device 3 can, under the control of the controller, press the interference-fit compression spring 5 and the spacer 43 together to ensure that the compression spring 5 maintains coaxiality with the piston rod during installation to avoid axial deviation. The positioning device 4 is used to fix the spacer 43 and the compression spring 5 to ensure that they will not be displaced during installation. The positioning fixture 42 can be adjusted according to the different specifications of the spacer 43 and the compression spring 5. The controller is used to coordinate the work processes of the clamping device 1 and the coaxial pressing device 3. The control system adopts a programmable logic controller and a human-machine interface to monitor and adjust various parameters during the installation process in real time.

[0029] The clamping device 1 comprises a first mechanical arm 11 and a gripping finger 12 . The gripping finger 12 is mounted at the end of the first mechanical arm 11 , and a sensor 13 is mounted on the gripping finger 12 .

[0030] See also Figure 2 The first robot arm 11 can drive the grasping fingers 12 to move flexibly, so that the grasping fingers 12 can freely grasp the spacer 43, the guide tooling 2 and the compression spring 5, and the grasping process of the grasping fingers 12 can be monitored through the setting of the sensor 13, and the state of the material in the loading and unloading process can be monitored in real time and fed back to the controller.

[0031] The positioning device 4 includes a workbench 41 and a positioning tool 42 , and the guide tool 2 is installed on the top of the spacer 43 .

[0032] See also Figure 2 and 3 The first robot arm 11 grabs the spacer sleeve 43 and places it on the positioning fixture 42. A circular hole 431 is provided inside the spacer sleeve 43, so that the circular hole 431 of the spacer sleeve 43 is connected to the top cylinder of the positioning fixture 42, ensuring the relative position of the spacer sleeve 43 and the first coaxial pressing fixture 33, ensuring that no displacement occurs during the pressing process, and the bottom of the positioning fixture 42 adopts a flat design, which can place the spacer sleeve 43 more stably.

[0033] The coaxiality pressing device 3 includes a bracket 31, a cylinder 32 and a first coaxiality pressing tool 33. The bracket 31 is arranged on the surface of the workbench 41, the cylinder 32 is installed on the surface of the bracket 31, and the first coaxiality pressing tool 33 is installed on the output end of the cylinder 32. The positioning device 4 also includes a tool base 44, which is fixed to the surface of the workbench 41 and is located on one side of the positioning tool 42.

[0034] See also Figure 2 and 4 The first robot arm 11 grabs the guide tool 2 from the surface of the tool base 44 through the grabbing finger 12 and places it inside the spacer 43. The bottom of the guide tool 2 is provided with a small diameter cylinder 22. At this time, the small diameter cylinder 22 enters the circular hole 431 of the spacer 43 to ensure that the guide tool 2 is coaxial with the spacer 43 and the compression spring 5 is in a vertical state, so as to realize automatic press fitting. Then the cylinder 32 is started, and the cylinder 32 can drive the first coaxial pressing tool 33 to move downward, so as to press the compression spring 5 into the spacer 43.

[0035] The sensor 13, the first robot arm 11, the gripping finger 12 and the cylinder 32 are all electrically connected to the controller.

[0036] See also Figure 7 Through the setting of the controller, the clamping device 1, the coaxial pressing device 3 and the positioning device 4 can be controlled respectively to realize the automatic assembly between the compression spring 5 and the spacer 43.

[0037] The inner wall of the first coaxial pressing fixture 33 is provided with an inner column 331, the top of the guide fixture 2 is provided with an inner hole 21, the bottom of the inner column 331 is inserted into the inner hole 21, and the inner wall of the first coaxial pressing fixture 33 is provided with an outer cylindrical portion 332. The first coaxial pressing fixture 33 ensures coaxiality by cooperating with the outer circle of the compression spring 5 through the outer cylindrical portion 332.

[0038] See also Figure 5 When the first coaxial pressing tool 33 moves downward, the inner column 331 enters the inner hole 21 to cooperate and ensure the coaxiality, and the outer cylindrical part 332 can contact the outer circle of the compression spring 5, and finally achieve the coaxiality of the compression spring 5 and the spacer 43.

[0039] The working principle is as follows: fix the spacer 43 on the positioning tooling 42, and then the first robot arm 11 grabs the guide tooling 2 through the grabbing fingers 12, so that the small-diameter cylinder 22 at the bottom of the guide tooling 2 enters the circular hole 431 of the spacer sleeve 43, ensuring that the subsequent compression spring 5 is in a vertical position. At this time, the first robot arm 11 clamps the compression spring 5 to be installed from the vibration plate according to the instructions of the control system and places the compression spring 5 on the surface of the guide tooling 2. The assembly of the compression spring 5 and the spacer sleeve 43 adopts an interference fit. Under the precise control of the controller, the cylinder 32 drives the first coaxiality pressing tooling 33 to move downward, presses the compression spring 5 into the spacer sleeve 43, and ensures the coaxiality of the compression spring 5 and the spacer sleeve 43. After the installation is completed, the system automatically detects the assembly quality of the compression spring 5 to ensure that the coaxiality meets the preset standard.

[0040] Embodiment 2

[0041] In this embodiment, the coaxiality pressing device 3 further includes a second mechanical arm 34 and a second coaxiality pressing tool 35 , and the second coaxiality pressing tool 35 is installed at the end of the second mechanical arm 34 .

[0042] See also Figure 6 The methods of using the guide tooling 2 and the positioning tooling 42 are the same as those in Example 1, and the specific structures of the second coaxiality pressing tooling 35 and the first coaxiality pressing tooling 33 are also the same. What is different from Example 1 is that the second mechanical arm 34 can directly drive the second coaxiality pressing tooling 35 to move downward to complete the pressing action, thereby ensuring the coaxiality of the compression spring 5 and the spacer sleeve 43.

[0043] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A spring press-fitting and coaxiality correction device for a cylinder piston rod assembly, characterized in that: It comprises a clamping device (1), a guiding tool (2), a coaxial pressing device (3), a positioning device (4) and a controller; The clamping device (1) comprises a first mechanical arm (11) and a gripping finger (12), wherein the gripping finger (12) is mounted at the end of the first mechanical arm (11); The positioning device (4) comprises a workbench (41) and a positioning tool (42), wherein the positioning tool (42) is installed on the surface of the workbench (41); The coaxiality pressing device (3) comprises a bracket (31), a cylinder (32) and a first coaxiality pressing tool (33), wherein the bracket (31) is arranged on the surface of a workbench (41), the cylinder (32) is mounted on the surface of the bracket (31), and the first coaxiality pressing tool (33) is mounted on the output end of the cylinder (32); The first mechanical arm (11), the grasping finger (12) and the cylinder (32) are all electrically connected to the controller.

2. The spring press-fitting and coaxiality correction device for a cylinder piston rod assembly according to claim 1, characterized in that: The positioning device (4) further comprises a tool base (44), wherein the tool base (44) is fixed to the surface of the workbench (41) and is located on one side of the positioning tool (42).

3. The spring press-fitting and coaxiality correction device for a cylinder piston rod assembly according to claim 1, characterized in that: A sensor (13) is installed on the grasping finger (12), and the sensor (13) is electrically connected to the controller.

4. The spring press-fitting and coaxiality correction device for a cylinder piston rod assembly according to claim 1, characterized in that: The inner wall of the first coaxial pressing tool (33) is provided with an inner column (331), the top of the guide tool (2) is provided with an inner hole (21), the bottom of the inner column (331) is inserted into the interior of the inner hole (21), and the bottom of the guide tool (2) is provided with a small-diameter cylinder (22).

5. The spring press-fitting and coaxiality correction device for a cylinder piston rod assembly according to claim 4, characterized in that: The inner wall of the first coaxiality pressing tool (33) is provided with an outer cylindrical portion (332), and the first coaxiality pressing tool (33) cooperates with the outer circle of the spring through the outer cylindrical portion (332) to ensure coaxiality.

6. The spring press-fitting and coaxiality correction device for a cylinder piston rod assembly according to claim 1, characterized in that: The coaxiality pressing device (3) further comprises a second mechanical arm (34) and a second coaxiality pressing tool (35), wherein the second coaxiality pressing tool (35) is installed at the end of the second mechanical arm (34).

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