Passive and movable hydraulic cylinder loading device and method

Abstract

The invention provides a passive and movable hydraulic cylinder loading device and method. The loading device is connected with a piston rod of the hydraulic cylinder, and the loading device provides loading force for the piston rod of the hydraulic cylinder to be tested; the hydraulic cylinder to be tested is stably connected with the loading device through the connecting device; the loading force applied to the hydraulic cylinder to be tested can be steplessly adjusted by adjusting the loading device. The monitoring device can monitor the loading force applied to the hydraulic cylinder to be detected and the displacement of the piston rod of the hydraulic cylinder to be detected through the sensor. And when the loading force applied to the piston rod of the hydraulic cylinder to be tested does not reach a specified value, the loading device can be adjusted again, so that the applied loading force meets the requirement. And comparing the loading force in the loading test with the displacement of the piston rod of the hydraulic cylinder to be tested through the monitoring device to judge whether the performance of the hydraulic cylinder to be tested under the rated loading force meets the requirement or not. When the loading test of the hydraulic cylinder to be tested is completed, the loading force can be removed by adjusting the loading device.

Description

Technical Field

[0001] This invention relates to the field of hydraulic cylinder loading tests, specifically to a loading device and method for hydraulic cylinders, and in particular, to a passive, movable hydraulic cylinder loading device. Background Technology

[0002] A hydraulic cylinder is a hydraulic actuator that converts hydraulic energy into mechanical energy, performing linear reciprocating motion or oscillating motion. Hydraulic cylinders have wide applications in existing machining fields. To ensure the stable operation of hydraulic cylinders, loading tests are required during production and testing to determine their performance during operation.

[0003] Existing Chinese patent application document CN119124499A discloses a hydraulic cylinder loading test device, belonging to the field of hydraulic cylinder loading test technology. This invention relates to a hydraulic cylinder loading test device applied to the field of hydraulic cylinder loading test technology, comprising a motor drive mechanism and a signal processing system. The motor drive mechanism includes a drive motor housing, a drive motor installed inside the drive motor housing, and a rotating disk installed at the output end of the drive motor. A fixed rod A is provided on one side of the rotating disk, and a primary transmission rod is rotatably connected to the fixed rod A. A secondary transmission rod is hinged to the primary transmission rod, and a pressure sensor is provided at the end of the secondary transmission rod. A valve assembly is installed at the hydraulic oil inlet of the hydraulic cylinder body. The signal processing system includes a platform movement module and a performance detection module. Through the above structure, the air pressure detection method is used to detect the airtightness of the hydraulic cylinder.

[0004] The existing technology of loading hydraulic cylinders through active means such as motors has problems such as complex devices, high costs, and inability to move, and there are areas that need to be improved. Summary of the Invention

[0005] In view of the above-mentioned prior art, the purpose of this invention is to provide a passive, mobile hydraulic cylinder loading device and method.

[0006] According to the present invention, a passive, movable hydraulic cylinder loading device and method include a monitoring device, a hydraulic cylinder under test, a connecting device, and a loading device. The loading device is connected to the piston rod of the hydraulic cylinder and provides a loading force to the piston rod of the hydraulic cylinder under test. The connecting device stably connects the hydraulic cylinder under test to the loading device. The loading force applied to the hydraulic cylinder under test can be steplessly adjusted by adjusting the loading device. The monitoring device monitors the loading force applied to the hydraulic cylinder under test and the displacement of the piston rod of the hydraulic cylinder under test through sensors. When the loading force applied to the piston rod of the hydraulic cylinder under test does not reach the specified value, the loading device can be adjusted again to ensure that the applied loading force meets the requirements. The monitoring device compares the loading force and the displacement of the piston rod of the hydraulic cylinder under test during the loading test to determine whether the performance of the hydraulic cylinder under test meets the requirements under the rated loading force. When the loading test of the hydraulic cylinder under test is completed, the loading force can be removed by adjusting the loading device. This passive, mobile hydraulic cylinder loading device does not rely on external energy and can move along with the hydraulic cylinder under test during the loading test, reducing the cost of hydraulic cylinder loading tests and improving the efficiency and convenience of hydraulic cylinder loading tests. Its small size and low cost are conducive to large-scale deployment.

[0007] In the aforementioned passive, movable hydraulic cylinder loading device, the rotation of the loading device piston rod drives the lead screw to rotate. The lead screw and the connecting lug rotate relative to each other, with opposite directions of movement. The lead screw, connected to the loading device piston rod, compresses and stores energy in the spring. The loading device applies a loading force to the piston rod of the hydraulic cylinder under test through the connecting lug. When the left spring of the loading device is compressed, the piston of the hydraulic cylinder under test receives a rightward loading force; when the right spring of the loading device is compressed, the piston rod of the hydraulic cylinder under test receives a leftward loading force. During the continuous application of the loading force, the spring force and the self-locking ability of the lead screw ensure that the loading force does not decay. Furthermore, a loading force sensor is used to monitor changes in the applied loading force, and a displacement sensor is used to monitor the displacement of the piston rod of the hydraulic cylinder under test, improving the accuracy of the loading device.

[0008] As a further improvement of this application, a tension / compression sensor is installed on the axis of the loading device lead screw and the hydraulic cylinder under test to monitor the loading force applied by the loading device, and a displacement sensor is installed on the loading device to monitor the displacement of the piston rod and lead screw of the loading device.

[0009] As a further improvement to this application, the connecting device for connecting the hydraulic cylinder under test and the loading device can be other forms that ensure the relative positions of the hydraulic cylinder under test and the loading device are fixed.

[0010] As a further improvement to this application, an external power source such as a motor is added to the right side of the loading device to rotate the piston rod and lead screw of the loading device. The motor and the loading force sensor monitoring device work together to automatically adjust the change of loading force.

[0011] According to the present invention, a leakage detection method for hydraulic cylinders includes the following steps: S1. Install the retaining ring onto the hydraulic cylinder to be tested; S2. Connect the adapter plate to the loading device; S3. Connect the piston rod of the hydraulic cylinder under test to the loading device using pins, lug bolts, and connecting lugs; S4. Adjust the through screw and adjusting nut, connect and fix the retaining ring and the adapter plate, and adjust and fix the relative position of the hydraulic cylinder under test and the loading device. S5. Use a ratchet wrench to rotate the piston rod of the loading device to apply a loading force to the piston rod of the hydraulic cylinder under test. During the process, the magnitude of the loading force is monitored by a sensor, and the displacement of the piston rod of the hydraulic cylinder under test is monitored by a displacement sensor. S6. After the rated loading time, rotate the piston rod of the loading device in the opposite direction to release the loading force; S6. Disconnect the connecting device to end the test; In summary, this invention eliminates the need for external power during the application of the loading force, relying solely on the spring force to maintain the loading force on the piston rod of the hydraulic cylinder under test. The loading device is connected only to the hydraulic cylinder under test and can move with it. The monitoring device can monitor changes in the loading force, allowing for adjustments based on these changes during the loading process. Furthermore, the monitoring device can monitor the displacement changes of the piston rod of the hydraulic cylinder under test. This invention improves the convenience and reduces the cost of loading tests while maintaining the accuracy of the hydraulic cylinder loading test. Attached Figure Description

[0012] Other features, objects, and advantages of the present invention will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings: Figure 1 This is a schematic diagram illustrating the main components of the detection equipment of this invention; Figure 2 This is a schematic diagram illustrating the sensor positions of the monitoring device, which is the main feature of this invention. Figure 3 This is a schematic diagram illustrating the main connecting device of the present invention; Figure 4 This is a schematic diagram illustrating the main loading device of the present invention; As shown in the figure: Detailed Implementation

[0013] The present invention will now be described in detail with reference to specific embodiments. These embodiments will help those skilled in the art to further understand the present invention, but do not limit the invention in any way. It should be noted that those skilled in the art can make several changes and improvements without departing from the concept of the present invention. These all fall within the protection scope of the present invention.

[0014] This invention provides a passive, movable hydraulic cylinder loading device, characterized in that it includes a monitoring device 1, a hydraulic cylinder under test 2, a connecting device 3, and a loading device 4; wherein, the connecting device 3 connects the hydraulic cylinder under test 2 to the loading device 4; the loading device 4 is connected to the piston rod 12 of the hydraulic cylinder under test, and the loading device 4 applies a loading force to the piston rod 12 of the hydraulic cylinder under test. The loading device 4 includes a loading cylinder body 25, a cylinder body nut 18, a piston rod 24, a bearing sleeve 22, a bearing sleeve nut 21, a lead screw 17, a pin 20, rolling steel balls 23, and a spring 19; wherein, the piston rod 24 and the lead screw 17 are connected by threads; the pin 20 is used for anti-loosening connection after the piston rod 24 and the lead screw 17 are connected; the bearing sleeve nut 21, through a threaded connection with the bearing sleeve 22, constrains the rolling steel balls 23, the piston rod 24, and the lead screw 17 connection body within the bearing sleeve 22; the piston rod 24 and the lead screw 17 connection body can be... The bearing sleeve rotates with low resistance; the springs 19 are located on both sides of the bearing sleeve 22 and are guided by the piston rod 24 and the lead screw 17; the loading cylinder 25 provides circumferential constraint for the assembly of piston rod 24, lead screw 17, pin 20, bearing sleeve 22, rolling steel ball 23, bearing sleeve nut 21, and spring 19; the two ends of the loading cylinder 25 are respectively connected to the cylinder nut 18 by threads, which constrains the assembly of piston rod 24, lead screw 17, pin 20, bearing sleeve 22, rolling steel ball 23, bearing sleeve nut 21, and spring 19 within the loading cylinder 25. The connecting device 3 includes a fixing ring 9, a ring fastening screw 8, a ring fastening nut 7, an adapter plate 16, a threaded rod 11, an adjusting nut 10, an ear bolt 13, a pin 14, and a connecting lug 15. The fixing ring 9 is engaged with the hydraulic cylinder 2 under test. The adapter plate 16 is threadedly connected to the loading device 4 and is used in conjunction with the fixing ring 9. The ear bolt 13 is threadedly connected to the piston rod 12 of the hydraulic cylinder under test. The connecting lug 15 is threadedly connected to a lead screw 17. The pin 14 connects the piston rod 12 of the hydraulic cylinder under test to the loading device 4 through the pin hole of the connecting lug 15 and the inner hole of the ear bolt 13. The ring fastening screw 8 and the ring fastening nut 7 are used to secure the ring 9. The threaded rod 11 and the adjusting nut 10 are used to adjust and fix the relative positions of the hydraulic cylinder 2 under test and the loading device 4. The connecting device 3 includes other connection methods that keep the relative positions of the hydraulic cylinder 2 under test and the loading device 4 unchanged. The monitoring device 1 includes a loading force sensor 6 and a piston rod displacement sensor 5 of the hydraulic cylinder under test, used to monitor the loading force of the loading device 4 and the displacement of the piston rod 12 of the hydraulic cylinder under test under the loading force, respectively.

[0015] This invention also provides a loading method applicable to a passive, mobile hydraulic cylinder loading device, characterized in that... S1. Install the retaining ring 9 onto the hydraulic cylinder 2 to be tested; S2. Connect the adapter plate 16 to the loading device 4; S3. Use pin 14, ear bolt 13, and connecting lug 15 to connect the piston rod 12 of the hydraulic cylinder to be tested to the loading device 4. S4. Adjust the through screw 11 and the adjusting nut 10, connect and fix the retaining ring 9 and the adapter plate 16, and adjust and fix the relative position of the hydraulic cylinder 2 under test and the loading device 4. S5. Use a ratchet wrench to rotate the piston rod 24 of the loading device 4 to apply a loading force to the piston rod 12 of the hydraulic cylinder under test. During the process, the magnitude of the loading force is monitored by the loading force sensor 6 and the displacement of the piston rod 12 of the hydraulic cylinder under test is monitored by the displacement sensor 5. S6. After the rated loading time, rotate the piston rod 24 of the loading device 4 in the opposite direction to release the loading force; S6. Disconnect the connecting device 3 to end the test.

[0016] like Figure 1 As shown, a passive, movable hydraulic cylinder loading device according to the present invention includes a monitoring device, a hydraulic cylinder under test, a connecting device, and a loading device. The hydraulic cylinder under test is connected to the loading device via the connecting device, and the loading device applies a loading force to the piston of the hydraulic cylinder under test; the monitoring device is used to monitor changes in the loading force and the piston position of the hydraulic cylinder under test.

[0017] During the loading test, the loading device applies a loading force to the piston of the hydraulic cylinder under test. The magnitude and direction of the loading force can be adjusted by the rotation direction and number of rotations of the piston rod of the loading device, and monitored by a monitoring device. When the piston rod of the hydraulic cylinder under test shifts due to leakage, the monitoring device can monitor it in real time, and the change in loading force caused by the piston rod shift can be adjusted again by rotating the piston rod of the loading device.

[0018] Specifically, the fixing chuck of the connecting device is fixed to the hydraulic cylinder under test by screws and nuts; the adapter plate is fixed to the loading device by threads; the adapter plate and the fixing ring are adjusted and fixed by through threaded screws and adjusting nuts to keep the relative positions of the hydraulic cylinder under test and the loading device unchanged; the lug bolts, pins, and connecting lugs are used to connect the piston rod of the hydraulic cylinder under test to the lead screw of the loading device; the dimensions of the fixing chuck and the adapter plate can be customized according to the dimensions of the hydraulic cylinder under test.

[0019] Specifically, the loading device includes a loading cylinder, a cylinder nut, a piston rod, a bearing sleeve, a bearing sleeve nut, a lead screw, a pin, rolling steel balls, and a spring. The piston rod and the lead screw are connected by threads; the pin is used to prevent loosening after the piston rod and the lead screw are connected; the bearing sleeve nut is connected to the bearing sleeve by threads to fix the rolling steel balls, piston rod, and lead screw assembly within the bearing sleeve; the piston rod and lead screw assembly can rotate with low resistance within the bearing sleeve; the springs are located on both sides of the bearing sleeve and are guided by the piston rod and the lead screw; the loading cylinder provides circumferential constraints for the piston rod, lead screw, pin, bearing sleeve, rolling steel balls, bearing sleeve nut, and rectangular spring assembly; the two ends of the loading cylinder are respectively connected to the cylinder nut by threads to constrain the piston rod, lead screw, pin, bearing sleeve, rolling steel balls, bearing sleeve nut, and spring assembly within the loading cylinder body; Specifically, the monitoring device includes a loading force sensor and a piston rod displacement sensor of the hydraulic cylinder under test, which can monitor the loading force of the loading device and the displacement of the piston rod of the hydraulic cylinder under test under the loading force, respectively.

[0020] The present invention also includes a method for loading a passive, movable hydraulic cylinder, employing the aforementioned detection device for a passive, movable hydraulic cylinder, the detection method comprising the following steps: S1. Install the retaining ring onto the hydraulic cylinder to be tested; S2. Connect the adapter plate to the loading device; S3. Connect the piston rod of the hydraulic cylinder under test to the loading device using pins, lug bolts, and connecting lugs; S4. Adjust the through screw and adjusting nut, connect and fix the retaining ring and the adapter plate, and adjust and fix the relative position of the hydraulic cylinder under test and the loading device. S5. Use a ratchet wrench to rotate the piston rod of the loading device to apply a loading force to the piston rod of the hydraulic cylinder under test. During the process, the magnitude of the loading force is monitored by a sensor, and the displacement of the piston rod of the hydraulic cylinder under test is monitored by a displacement sensor. S6. After the rated loading time, rotate the piston rod of the loading device in the opposite direction to release the loading force.

[0021] This passive, mobile hydraulic cylinder loading device does not rely on external energy and can move along with the hydraulic cylinder under test during the loading test, reducing the cost of hydraulic cylinder loading tests and improving the efficiency and convenience of hydraulic cylinder loading tests. Its small size and low cost are conducive to large-scale deployment.

[0022] In the description of this application, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0023] Specific embodiments of the present invention have been described above. It should be understood that the present invention is not limited to the specific embodiments described above, and those skilled in the art can make various changes or modifications within the scope of the claims, which do not affect the essence of the present invention. Unless otherwise specified, the embodiments and features described in this application can be arbitrarily combined with each other.

Claims

1. A passive, mobile hydraulic cylinder loading device, characterized in that, It includes a monitoring device (1), a hydraulic cylinder under test (2), a connecting device (3), and a loading device (4); among which, The connecting device (3) connects the hydraulic cylinder (2) to be tested to the loading device (4); The loading device (4) is connected to the piston rod (12) of the hydraulic cylinder to be tested, and the loading device (4) applies a loading force to the piston rod (12) of the hydraulic cylinder to be tested.

2. The passive, movable hydraulic cylinder loading device as described in claim 1, characterized in that, The loading device (4) includes a loading cylinder (25), a cylinder nut (18), a piston rod (24), a bearing sleeve (22), a bearing sleeve nut (21), a lead screw (17), a pin (20), rolling steel balls (23), and a spring (19); wherein, The piston rod (24) and the lead screw (17) are connected by threads; The pin (20) is used to prevent loosening after the piston rod (24) is connected to the lead screw (17); The bearing sleeve nut (21) is threadedly connected to the bearing sleeve (22) to constrain the rolling steel ball (23), piston rod (24) and lead screw (17) connection body within the bearing sleeve (22); The piston rod (24) and the lead screw (17) can rotate with low resistance within the bearing sleeve; The springs (19) are located on both sides of the bearing sleeve (22) and are guided by the piston rod (24) and the lead screw (17); The loading cylinder (25) provides circumferential constraints for the assembly of piston rod (24), lead screw (17), pin (20), bearing sleeve (22), rolling steel ball (23), bearing sleeve nut (21), and spring (19); The loading cylinder (25) is connected to cylinder nuts (18) at both ends by threads, which constrains the piston rod (24), lead screw (17), pin (20), bearing sleeve (22), rolling steel ball (23), bearing sleeve nut (21), and spring (19) assembly within the loading cylinder (25).

3. The passive, movable hydraulic cylinder loading device as described in claim 2, characterized in that, The connecting device (3) includes a fixing ring (9), a ring fastening screw (8), a ring fastening nut (7), an adapter plate (16), a threaded rod (11), an adjusting nut (10), an ear bolt (13), a pin (14), and a connecting lug (15); wherein, The retaining ring (9) is engaged with the hydraulic cylinder (2) to be tested; The adapter plate (16) is connected to the loading device (4) by a thread, and the adapter plate (16) is used in conjunction with the fixing ring (9); The earring bolt (13) is connected to the piston rod (12) of the hydraulic cylinder under test by thread. The connecting lug (15) is connected to the lead screw (17) via a threaded connection. The pin (14) connects the piston rod (12) of the hydraulic cylinder under test to the loading device (4) through the pin hole of the connecting lug (15) and the inner hole of the lug bolt (13); The retaining ring fastening screw (8) and retaining ring fastening nut (7) are used to fasten the retaining ring (9); The through screw (11) and adjusting nut (10) are used to adjust and fix the relative position of the hydraulic cylinder (2) under test and the loading device (4).

4. The passive, movable hydraulic cylinder loading device as described in claim 3, characterized in that, The connecting device (3) includes other connecting methods that keep the relative positions of the hydraulic cylinder (2) under test and the loading device (4) unchanged.

5. The passive, movable hydraulic cylinder loading device as described in claim 1, characterized in that, The monitoring device (1) includes a loading force sensor (6) and a piston rod displacement sensor (5) of the hydraulic cylinder under test, which are used to monitor the loading force of the loading device (4) and the displacement of the piston rod (12) of the hydraulic cylinder under test under the loading force.

6. A loading method applicable to the passive, movable hydraulic cylinder loading device as described in any one of claims 1-5, characterized in that, S1. Install the retaining ring (9) onto the hydraulic cylinder (2) to be tested; S2. Connect the adapter plate (16) to the loading device (4); S3. Use pin (14), lug bolt (13), and connecting lug (15) to connect the piston rod (12) of the hydraulic cylinder to be tested to the loading device (4); S4. Adjust the threaded screw (11) and the adjusting nut (10), connect the fixing ring (9) and the adapter plate (16), and adjust and fix the relative position of the hydraulic cylinder (2) to be tested and the loading device (4); S5. Use a ratchet wrench to rotate the piston rod (24) of the loading device (4) to apply a loading force to the piston rod (12) of the hydraulic cylinder under test. During the process, the magnitude of the loading force is monitored by the loading force sensor (6) and the displacement of the piston rod (12) of the hydraulic cylinder under test is monitored by the displacement sensor (5). S6. After the rated loading time, rotate the piston rod (24) of the loading device (4) in the reverse direction to remove the loading force; S6. Remove the connecting device (3) and end the test.

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