Plunger flexibility detection device

Abstract

The utility model discloses a plunger flexibility detection device, including detection stage, be equipped with detection sliding platform on detection stage, this detection sliding platform can be by sliding platform drive motor control shift, and its shift direction is the telescopic direction of the plunger on the detected rocker arm, be equipped with the rotary chuck for clamping the plunger on the detected rocker arm on detection sliding platform, and the rotary chuck is rotatoryly supported on detection sliding platform through floating centering device, sleeve and rotary table bearing, and the rotary chuck is controlled rotation by gear belt transmission pair through chuck drive motor, and the operation setting parameter of sliding platform drive motor and chuck drive motor is regulated by detection control system, and its actual operation parameter is fed back to detection control system.

Description

Technical Field

[0001] This utility model relates to a quality inspection device, and more particularly to a device for detecting the movement flexibility of the piston on an engine rocker arm. Background Technology

[0002] A rocker arm with a plunger is a novel rocker arm structure. One end of this rocker arm is fitted with a plunger driven by high-pressure hydraulic fluid. The rocker arm contacts the corresponding component through this plunger to eliminate valve clearance. A plunger drive oil passage is provided between the rocker arm shaft hole and the plunger on the rocker arm body, and a corresponding one-way valve is installed to control the entry of high-pressure hydraulic fluid and maintain oil pressure. During operation, the plunger can extend a certain distance under the action of high-pressure hydraulic fluid to eliminate valve clearance, and the one-way valve maintains the plunger position through the hydraulic fluid. Such a rocker arm structure requires strict control of manufacturing and assembly quality during the manufacturing and assembly process. This ensures that the plunger can extend and retract flexibly while maintaining a certain level of fit with the rocker arm body. It also ensures that leakage of high-pressure hydraulic fluid under high working pressure is controlled within design requirements. Therefore, after the rocker arm is assembled, the flexibility of the plunger's extension and retraction under a certain pressure must be tested. Since the hydraulically driven plunger on the rocker arm is a novel structure, most existing testing methods use simulation of actual working conditions for observation, which cannot yield quantitative results and is prone to misjudgment, resulting in low testing accuracy. Utility Model Content

[0003] In view of the above-mentioned shortcomings of the existing technology, the technical problem to be solved by this utility model is to provide a plunger flexibility detection device, which can automatically and quantitatively detect the movement flexibility of the plunger on the rocker arm.

[0004] To solve the above-mentioned technical problems, the present invention provides a plunger flexibility testing device, including a testing platform with a testing slide on the testing platform. The testing slide can be moved by a slide drive motor, and its movement direction is the extension and retraction direction of the plunger on the tested rocker arm. A rotating chuck is provided on the testing slide to hold the plunger on the tested rocker arm. The rotating chuck is controlled to rotate by a chuck drive motor. The operating setting parameters of the slide drive motor and the chuck drive motor are controlled by the testing control system, and their actual operating parameters are fed back to the testing control system.

[0005] After adopting the above technical solution, the rocker arm to be tested is fixedly installed on the testing table. The plunger on the rocker arm is pushed out under a certain medium pressure and held in the extended state. The set rotary chuck can hold the plunger on the rocker arm. The detection of the plunger's movement flexibility can be achieved by applying axial displacement to the plunger through the rotary chuck held by the testing slide under the control of the slide drive motor. Under the action of this axial pressure, the plunger will retract inward. If the plunger retracts quickly and the resistance of the plunger to the slide drive motor is small, it indicates that the fit clearance between the plunger and the relevant parts of the rocker arm body is large. When the plunger is subjected to high working pressure, the leakage of the medium will exceed the design requirements, and the valve will not be able to be driven in time during actual use. Conversely, it means that the fit between the plunger and the rocker arm body is tight, and the axial movement flexibility of the plunger is poor. By comparing the set command data of the control system for regulating the slide drive motor with the data fed back by the actual operation of the slide drive motor and the amount of plunger contraction within a certain period of time, the flexibility of the plunger in the extension and retraction direction can be analyzed. Moreover, the flexibility of the plunger extension and retraction is judged by specific parameters such as torque fed back by the slide drive motor. The detection results are quantitative and accurate. Another aspect of testing the plunger's rotational flexibility is achieved by a chuck drive motor rotating the chuck to drive the plunger. If the plunger requires a large driving torque to rotate, it indicates poor rotational flexibility. Conversely, if the required driving torque is small, it indicates low rotational resistance and a loose fit between the plunger and the rocker arm. These assessments of plunger rotational flexibility can be quantified by comparing the set commands from the control system to the chuck drive motor with the actual data from its operation, resulting in accurate test results.

[0006] In a preferred embodiment of this invention, the detection slide is slidably supported on the detection table via a linear guide pair, and the slide drive motor is connected to the detection slide via a ball screw and nut pair, with the drive motor fixedly connected to the detection table. With this embodiment, the linear guide pair provides stable linear displacement support for the detection slide, and the ball screw and nut pair enables precise linear displacement transmission, with both exhibiting minimal resistance. This provides a stable and precise axial pressing transmission for detecting the plunger's flexibility.

[0007] In another preferred embodiment of this invention, the chuck drive motor drives the rotating chuck to rotate via a toothed belt drive pair. The driven pulley of the toothed belt drive pair is fixedly connected to the rotating sleeve, which is connected to the rotating chuck. Using this embodiment, the toothed belt drive pair can ensure a precise and stable transmission ratio, providing reliable transmission for the rotating chuck to drive the plunger's rotation.

[0008] In another preferred embodiment of this utility model, the rotating sleeve is connected to the rotating chuck via a floating centering device. In this embodiment, the floating centering device is a key component in industrial automation used to compensate for assembly errors. By automatically adjusting positional deviations, it ensures precise workpiece alignment. Thus, the floating centering device, positioned between the rotating sleeve and the rotating chuck, can compensate for any possible axial misalignment between the plunger on the tested rocker arm and the rotating chuck, allowing the rotating chuck to smoothly clamp the plunger and the rotating sleeve to steadily drive the plunger to rotate.

[0009] In a further preferred embodiment of this invention, both the slide drive motor and the chuck drive motor are servo motors. In this embodiment, the servo motor acts as the engine controlling the operation of mechanical components in a servo system. It converts voltage signals into torque and speed to drive the controlled object and feeds back actual operating data to the servo system for comparison and tracking with input parameters, achieving high motion control accuracy. Using servo motors as both the slide drive motor and the chuck drive motor allows for convenient adjustment of the set motion parameters according to testing requirements, and provides real-time feedback of actual motion parameters, thereby better realizing the automated and quantitative testing of the plunger's motion flexibility.

[0010] In another further preferred embodiment of this utility model, the rotating sleeve is rotatably supported on the detection slide by a turntable bearing. In this embodiment, the turntable bearing is a high-precision bearing that integrates mechanical support and rotation functions, possessing the ability to withstand axial, radial, and overturning moment loads, and can well adapt to the rotation and support requirements of the rotating sleeve.

[0011] In another preferred embodiment of this invention, the rotating chuck is a three-jaw pneumatic chuck. The three-jaw pneumatic chuck is connected to an external air pressure source via a pneumatic slip ring. The pneumatic slip ring is mounted above the rotating sleeve, and its rotor is connected to the rotating sleeve. Using this embodiment, the three-jaw pneumatic chuck uses compressed air to drive the jaws to clamp shaft-like components. The clamping is reliable, quick, and easy to use. The pneumatic slip ring, as a mature component, ensures the supply of compressed air required for the rotating pneumatic chuck.

[0012] In a further preferred embodiment of this invention, the rotary chuck has a hollow structure, and a detection rod is movably disposed within the inner hole of the rotary chuck. The lower end of the detection rod can contact and fit against the outer end face of the rocker arm plunger. A displacement sensor is also provided on the detection slide. The upper end of the detection rod passes through the floating centering device, the rotating sleeve, and the pneumatic slip ring and is connected to the detection head of the displacement sensor. With this embodiment, the detection rod and displacement sensor can promptly sense the extension state of the plunger on the rocker arm being tested, providing a basis for whether the rotary chuck clamps the plunger. It can also promptly detect the relative movement between the rotary chuck and the plunger when slippage occurs due to insufficient clamping, sense this abnormal state, and report it to the detection and control system. Attached Figure Description

[0013] The plunger flexibility detection device of this utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0014] Figure 1 This is a schematic diagram of a specific embodiment of the plunger flexibility testing device of this utility model;

[0015] Figure 2 yes Figure 1 Top view of the structure shown;

[0016] Figure 3 yes Figure 1 Left side view of the structure shown;

[0017] Figure 4 yes Figure 1 A magnified view of the lower part of the rotating chuck in the structure shown.

[0018] In the diagram: 1-Detection table, 2-rocker arm, 3-plunger, 4-rotary chuck, 5-detection rod, 6-floating centering device, 7-linear guide pair, 8-detection slide, 9-turntable bearing, 10-toothed belt drive pair, 11-pneumatic slip ring, 12-displacement sensor, 13-chuck drive motor, 14-slide drive motor, 15-ball screw nut pair, 16-rotating sleeve, 17-driven wheel. Detailed Implementation

[0019] exist Figure 1 and Figure 2 In the plunger flexibility testing device shown, the testing platform 1 is the basic support component of this testing device. A testing fixture for clamping the rocker arm 2 to be tested is installed on the horizontal support surface of the testing platform 1. After the rocker arm 2 is positioned and installed, the plunger 3 on it is in a vertical state. A testing slide 8 is slidably supported on the vertical plane of the testing platform 1 via a linear guide pair 7. The testing slide 8 can be controlled by the slide drive motor 14 to move vertically. This movement direction is the extension and retraction direction of the plunger 3 on the rocker arm 2. (See [reference]). Figure 3The slide drive motor 14 is connected to the detection slide 8 via the ball screw nut pair 15, and the slide drive motor 14 is fixedly connected to the detection table 1.

[0020] The testing slide 8 is equipped with a rotating chuck 4 for clamping the plunger 3 on the rocker arm 2 being tested, such as... Figure 3 As shown, the rotating chuck 4 is connected to the rotating sleeve 16 via a floating centering device 6. The rotating sleeve 16 is rotatably supported on the detection slide 8 via a turntable bearing 9. Thus, the rotating chuck 4 is rotatably supported on the detection slide 8. The rotating chuck 4 is controlled to rotate by the chuck drive motor 13 via a toothed belt drive pair 10. The driven pulley 17 of the toothed belt drive pair 10 is fixedly connected to the rotating sleeve 16. The rotating chuck 4 is preferably a three-jaw pneumatic chuck. The three-jaw pneumatic chuck is connected to an external air pressure source via a pneumatic slip ring 11. The pneumatic slip ring 11 is mounted above the rotating sleeve 16, and the rotor of the pneumatic slip ring 11 is connected to the rotating sleeve. The pneumatic slip ring 11 is connected to the stator of the pneumatic slip ring 11 via an external air pressure source. The rotor of the pneumatic slip ring 11 is then connected to the interior of the three-jaw pneumatic chuck via a connecting hole on the wall of the rotating sleeve 16, a connecting hole on the flange connecting the rotating sleeve 16 and the floating centering device 6, a pipe joint on the outer periphery of the connecting flange, an external connecting pipe, and a pipe joint on the outer periphery of the three-jaw pneumatic chuck. This drives the jaws on the three-jaw pneumatic chuck to move. The floating centering device 6, the turntable bearing 9, the three-jaw pneumatic chuck, and the pneumatic slip ring 11 are all preferably selected from readily available general-purpose components.

[0021] See Figure 4 The rotary chuck 4 has a hollow structure. A detection rod 5 is movably installed in the inner hole of the rotary chuck 4. The lower end of the detection rod 5 can contact and fit with the outer end face of the plunger 3 of the rocker arm 2 by its own weight. A displacement sensor 12 is also provided on the detection slide 8. The upper end of the detection rod 5 passes through the floating centering device 6, the rotating sleeve 16 and the pneumatic slip ring 11 and contacts and connects with the detection head of the displacement sensor 12. A linear bearing for radially supporting the detection rod 5 is provided in the rotating sleeve 16.

[0022] The slide drive motor 14 and chuck drive motor 13 mentioned above are preferably servo motors. The operating parameters of the slide drive motor 14 and chuck drive motor 13 are controlled by the detection control system (not shown in the figure), and their actual operating parameters are fed back to the detection control system. During the detection process, the plunger 3 fixedly clamped on the rocker arm 2 on the detection table 1 is pushed out under a certain medium pressure and held in the extended state. The detection slide 8 descends so that the rotating chuck 4 can clamp the outer cylindrical surface of the plunger 3 on the rocker arm 2. The clamping state is as follows: Figure 4As shown, at this time, the detection rod 5 contacts and is lifted up by the outer end face of the plunger 3, and the position information is recorded by the displacement sensor 12. After that, the chuck drive motor 13 drives the plunger 3 to rotate at a low speed through the rotating chuck 4. At the same time, the slide drive motor 14 drives the plunger 3 to slowly move down a short distance through the detection slide 8 and the rotating chuck 4. Then the slide drive motor 14 and the chuck drive motor 13 stop running. By comparing the setting command data of the detection control system for regulating the slide drive motor 14 and the chuck drive motor 13 with the speed, torque and other data fed back by the actual operation of the slide drive motor 14 and the chuck drive motor 13, it is possible to analyze whether the plunger 3 has displacement pauses, rotation pauses and running resistance during the driving process. Thus, the conclusion of whether the movement flexibility of the plunger 3 on the rocker arm 2 is qualified can be drawn from the quantitative data such as speed and torque.

[0023] The above are only some preferred embodiments of this utility model, but this utility model is not limited thereto, and many improvements and modifications can be made. Any improvements and modifications made based on the basic principles of this utility model should be considered to fall within the protection scope of this utility model.

Claims

1. A plunger flexibility testing device, comprising a testing platform (1), characterized in that: A detection slide (8) is provided on the detection table (1). The detection slide (8) can be moved by the slide drive motor (14). The moving direction is the extension and retraction direction of the piston on the rocker arm being tested. A rotating chuck (4) is provided on the detection slide (8) to hold the piston on the rocker arm being tested. The rotating chuck (4) is rotated by the chuck drive motor (13). The operating setting parameters of the slide drive motor (14) and the chuck drive motor (13) are controlled by the detection control system, and their actual operating parameters are fed back to the detection control system.

2. The plunger flexibility testing device according to claim 1, characterized in that: The detection slide (8) is slidably supported on the detection table (1) by a linear guide pair (7), and the slide drive motor (14) is connected to the detection slide (8) through a ball screw nut pair (15). The slide drive motor (14) is fixedly connected to the detection table (1).

3. The plunger flexibility testing device according to claim 1, characterized in that: The chuck drive motor (13) drives the rotating chuck (4) to rotate through the toothed belt drive pair (10). The driven wheel (17) of the toothed belt drive pair (10) is fixedly connected to the rotating sleeve (16), and the rotating sleeve (16) is connected to the rotating chuck (4).

4. The plunger flexibility testing device according to claim 3, characterized in that: The rotating sleeve (16) is connected to the rotating chuck (4) via a floating centering device (6).

5. The plunger flexibility testing device according to claim 1, 2 or 3, characterized in that: Both the slide drive motor (14) and the chuck drive motor (13) are servo motors.

6. The plunger flexibility testing device according to claim 3, characterized in that: The rotating sleeve (16) is rotatably supported on the detection slide (8) by a turntable bearing (9).

7. The plunger flexibility testing device according to claim 1 or 3, characterized in that: The rotating chuck (4) is a three-jaw pneumatic chuck. The three-jaw pneumatic chuck is connected to an external air pressure source through a pneumatic slip ring (11). The pneumatic slip ring (11) is installed above the rotating sleeve (16), and the rotor of the pneumatic slip ring (11) is connected to the rotating sleeve (16).

8. The plunger flexibility testing device according to claim 1, characterized in that: The rotating chuck (4) has a hollow structure. A detection rod (5) is movably installed in the inner hole of the rotating chuck (4). The lower end of the detection rod (5) can contact and fit with the outer end face of the rocker arm plunger. A displacement sensor (12) is also provided on the detection slide (8). The upper end of the detection rod (5) passes through the floating centering device (6), the rotating sleeve (16) and the pneumatic slip ring (11) and is in contact with the detection head of the displacement sensor (12).

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