Hydraulic cylinder control characteristics test bench for heave compensation

Abstract

The present invention provides a test bench for the control characteristics of a heave compensation hydraulic cylinder, comprising: a base, a hydraulic cylinder system, a load-bearing latch, and a load mass. The base is installed within a test site, the hydraulic cylinder system is mounted on the base, the load-bearing latch is fixed to the load-bearing structure of the test site, and the load mass is mounted on the load-bearing latch. The hydraulic cylinder system is used to lift the load mass. The present invention replaces the hydraulic cavity of the piston rod of a vertical piston hydraulic cylinder with a matching cavity, shortening the stroke of the vertical piston hydraulic cylinder and significantly reducing the height requirement of the test site for the heave compensation hydraulic servo cylinder test bench.

Description

Technical Field

[0001] The present invention relates to the technical field of marine machinery, in particular to a wave compensation hydraulic cylinder control characteristic test bench. Background Art

[0002] The site for long-stroke wave compensation hydraulic cylinder experiments has high requirements for site height. The existing hydraulic cylinder control characteristic test bench cannot conduct long-stroke vertical hydraulic cylinder experiments in a limited indoor environment. In addition, the existing wave compensation hydraulic cylinder test bench requires additional equipment or manpower to install and remove the load mass block when loading and unloading equivalent mass, which increases the experimental cost and cannot guarantee the safety of the experimenters.

[0003] Patent document CN115184059A discloses a winch-type heave compensation test bench based on a four-quadrant motor and its operating method. This patent document belongs to the field of marine engineering technology and equipment technology and includes a test bench, a mother ship simulation hydraulic cylinder, a disturbance simulation hydraulic cylinder, a cable storage winch, a four-quadrant motor, a passive motor, a load, a fixed pulley mechanism, a spring mechanism, a controller, and a pump station system. The cable of the cable storage winch passes through the fixed pulley mechanism and is connected to a tension sensor at its end, the lower end of which is connected to the load via a spring mechanism. The MRU attitude sensor, tension sensor, cable displacement sensor, and pump station system are all connected to the controller signal. However, the disturbance simulation hydraulic cylinder disclosed in this patent document is a traditional design and does not propose an innovative design for the hydraulic cylinder to reduce experimental costs, which is different from the technical solution of the present application. Summary of the Invention

[0004] In view of the defects in the prior art, the purpose of the present invention is to provide a hydraulic cylinder control characteristics test bench for wave compensation.

[0005] According to the present invention, a wave compensation hydraulic cylinder control characteristic test bench comprises: a base, a hydraulic cylinder system, a load-bearing pin and a load mass block;

[0006] The base is installed in the experimental site, the hydraulic cylinder system is installed on the base, the load-bearing pin is fixed on the load-bearing structure of the experimental site, and the load mass block is installed on the load-bearing pin; the hydraulic cylinder system is used to lift the load mass block.

[0007] Preferably, the hydraulic cylinder system includes a piston, a piston rod, a piston chamber and a matching chamber;

[0008] The piston and the piston rod are fixedly mounted, and the piston and the piston rod are slidably arranged in the piston cavity; the piston cavity and the matching cavity are connected, and hydraulic oil flows between the piston cavity and the matching cavity;

[0009] When the piston rod moves upward and the height of the piston rod exceeds the height of the load-bearing pin, the load mass block is lifted up by the piston rod;

[0010] When the piston rod moves downward and the height of the piston rod is lower than the height of the load-bearing pin, the load mass block is lifted up by the load-bearing pin.

[0011] Preferably, the load-bearing pins are provided in plurality, and the plurality of load-bearing pins are installed in the load-bearing structure of the experimental site at intervals according to preset heights.

[0012] Preferably, the load mass block includes a plurality of mass blocks of different masses, and the plurality of load mass blocks are respectively mounted on a plurality of the load-bearing pins from high to low;

[0013] When the piston rod moves upward, and the height of the piston rod exceeds the heights of the plurality of load-bearing pins in sequence, the plurality of load masses are lifted up in sequence by the piston rod;

[0014] When the piston rod moves downward, the height of the piston rod is successively lower than the heights of the plurality of load-bearing pins, and a plurality of the load mass blocks are successively lifted up by the load-bearing pins.

[0015] Preferably, the hydraulic cylinder system further includes an oil pipe and an oil tank, and the piston chamber is connected to the oil tank through the oil pipe;

[0016] A hydraulic pump and motor is provided in the oil tank, and the hydraulic pump and motor is used to pump the hydraulic oil in the oil tank into the piston chamber.

[0017] Preferably, the piston chamber is installed vertically, the piston chamber and the base are fixed by bolts, and the base and the ground of the experimental site are fixed by anchor bolts.

[0018] Preferably, the matching cavity is installed vertically, and the matching cavity is fixed to the ground of the experimental site by anchor bolts;

[0019] The piston cavity and the matching cavity are connected via an oil pipe;

[0020] The matching chamber is communicated with the oil tank, and the matching chamber can extract hydraulic oil from the oil tank.

[0021] Preferably, the inner size of the matching cavity is equal to that of the piston cavity, and the matching cavity and the piston cavity are located at the same height.

[0022] Preferably, the load mass block includes four mass blocks, the four mass blocks are respectively arranged in a U-shape with different inner width dimensions, and the four mass blocks can be stacked in sequence in the height direction;

[0023] The load-bearing pins are provided in four pairs, and the four pairs of the load-bearing pins are fixed sequentially on the wall of the experimental site. The load-bearing pins can bear the weight of the corresponding mass block and the mass block stacked thereon.

[0024] Preferably, the piston and the piston rod are fixedly mounted via a threaded connection, and the piston can move along the axis in the piston cavity.

[0025] Compared with the prior art, the present invention has the following beneficial effects:

[0026] 1. This invention replaces the hydraulic cavity of the piston rod of the vertical piston hydraulic cylinder with a matching cavity, shortening the stroke of the vertical piston hydraulic cylinder and significantly reducing the height requirement of the test site for the heave compensation hydraulic servo cylinder test bench. The equivalent mass is automatically loaded upward and unloaded downward, eliminating the need for any additional lifting equipment when replacing the mass during the experiment.

[0027] 2. The present invention uses a matching cavity to create an equivalent hydraulic rod container, which reduces the required site height for long-stroke wave compensation hydraulic cylinder testing by half, making it possible to conduct long-stroke vertical hydraulic cylinder testing in a limited indoor environment.

[0028] 3. By adopting a design of segmented U-shaped mass blocks and load-bearing pins, the present invention enables the heave compensation hydraulic cylinder test bench to automatically load and unload equivalent mass. During the experiment, no additional equipment or manpower is required to install and remove the load mass blocks, thus reducing experimental costs and ensuring the safety of experimenters.

[0029] 4. Given that the lowest hydraulic stiffness of the cylinder is near the middle of the cylinder stroke, the influence of the upper half of the cylinder stroke on the cylinder control characteristics can be reflected in the volume of the piston rod cavity. Therefore, the hydraulic cylinder control characteristics test bench and its working method provided by the present invention use the lower half of the stroke of the traditional hydraulic cylinder as the experimental range, and replace the piston rod cavity of the upper half of the stroke with a matching cavity at the same height as the piston cavity, thereby reducing the height of the hydraulic cylinder system while ensuring the accuracy of the hydraulic cylinder control characteristics test results. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Other features, objects and advantages of the present invention will become more apparent upon reading the detailed description of non-limiting embodiments with reference to the following drawings:

[0031] Figure 1 This is a schematic structural diagram of a wave compensation hydraulic cylinder control characteristic test bench according to the present invention;

[0032] Figure 2 This is a cross-sectional view of the control characteristics test bench of the hydraulic cylinder for wave compensation of the present invention.

[0033] The figure shows:

[0034] Base 1 lower end latch 301

[0035] Hydraulic cylinder system 2 intermediate pin 302

[0036] Piston 201 upper end pin 303

[0037] Piston rod 202 Load mass block 4

[0038] Piston cavity 203 First mass block 401

[0039] Matching cavity 204 Second mass block 402

[0040] Oil pipe 205 Third mass block 403

[0041] Fuel tank 206 Fourth mass block 404

[0042] Load-bearing pin 3 DETAILED DESCRIPTION

[0043] The present invention will be described in detail below with reference to specific embodiments. The following examples will help those skilled in the art to further understand the present invention, but are not intended to limit the present invention in any form. It should be noted that, for those skilled in the art, several changes and improvements can be made without departing from the scope of the present invention. These all fall within the scope of protection of the present invention.

[0044] Example 1:

[0045] like Figure 1 and Figure 2 As shown, this embodiment provides a hydraulic cylinder control characteristic test bench for wave compensation, including: a base 1, a hydraulic cylinder system 2, a load-bearing pin 3 and a load mass block 4. The base 1 is installed in the experimental site, the hydraulic cylinder system 2 is installed on the base 1, the load-bearing pin 3 is fixed on the load-bearing structure of the experimental site, the load mass block 4 is installed on the load-bearing pin 3, and the hydraulic cylinder system 2 is used to lift the load mass block 4.

[0046] The hydraulic cylinder system 2 includes a piston 201, a piston rod 202, a piston chamber 203, and a matching chamber 204. The piston 201 and the piston rod 202 are fixedly mounted and slideably arranged within the piston chamber 203. The piston chamber 203 and the matching chamber 204 are connected, and hydraulic oil flows between the piston chamber 203 and the matching chamber 204. When the piston rod 202 moves upward and its height exceeds the height of the load-bearing pin 3, the load mass 4 is lifted by the piston rod 202. When the piston rod 202 moves downward and its height falls below the height of the load-bearing pin 3, the load mass 4 is supported by the load-bearing pin 3. The piston 201 and the piston rod 202 are fixedly mounted via a threaded connection, and the piston 201 can move along its axis within the piston chamber 203.

[0047] The hydraulic cylinder system 2 also includes an oil pipe 205 and an oil tank 206 . The piston chamber 203 is connected to the oil tank 206 via the oil pipe 205 . A hydraulic pump motor is provided in the oil tank 206 for pumping the hydraulic oil in the oil tank 206 into the piston chamber 203 .

[0048] Piston chamber 203 is mounted vertically and secured to base 1 with bolts, which in turn are secured to the experimental site's floor with anchor bolts. Matching chamber 204 is mounted vertically and secured to the experimental site's floor with anchor bolts. Piston chamber 203 and matching chamber 204 are connected by oil pipe 205. Matching chamber 204 is also connected to oil tank 206, from which it draws hydraulic oil. Matching chamber 204 has the same internal dimensions as piston chamber 203 and is located at the same height as piston chamber 203.

[0049] A plurality of load-bearing pins 3 are provided, and the plurality of load-bearing pins 3 are installed in the load-bearing structure of the experimental site at predetermined height intervals. The load mass 4 includes a plurality of masses of different masses, and the plurality of load mass blocks 4 are respectively supported on the plurality of load-bearing pins 3 from high to low. When the piston rod 202 moves upward and the height of the piston rod 202 successively exceeds the height of the plurality of load-bearing pins 3, the plurality of load mass blocks 4 are successively lifted by the piston rod 202. When the piston rod 202 moves downward and the height of the piston rod 202 successively falls below the height of the plurality of load-bearing pins 3, the plurality of load mass blocks 4 are successively supported by the load-bearing pins 3.

[0050] The load mass 4 comprises four masses, each arranged in a U-shape with varying inner widths. The four masses can be stacked vertically. Four pairs of load-bearing pins 3 are secured to the walls of the experimental site. These pins are capable of bearing the weight of the corresponding mass and any stacked masses above it. The four masses are a first mass 401, a second mass 402, a third mass 403, and a fourth mass 404. The mass of the first mass 401 is 557g (including the piston rod), the mass of the second mass 402 is 118kg, the mass of the third mass 403 is 539kg, and the mass of the fourth mass 404 is 1286kg.

[0051] The load-bearing pins 3 are provided in three forms, namely the lower pin 301 , the middle pin 302 and the upper pin 303 . The second mass block 402 is mounted on the lower pin 301 , the third mass block 403 is mounted on the middle pin 302 , and the fourth mass block 404 is mounted on the upper pin 303 .

[0052] Working principle:

[0053] When the piston rod 202 of the hydraulic cylinder system 2 moves upward and reaches the corresponding stroke position, it lifts up the corresponding mass block, so that the hydraulic cylinder system is subjected to an equivalent load mass. As the stroke increases, the mass block originally supported on the load-bearing pin 3 is lifted up by the mass block below, so that the equivalent mass of the hydraulic cylinder system 2 increases; when the piston rod 202 of the hydraulic cylinder system 2 moves downward, the height of the load mass block 4 drops to the height of the load-bearing pin, so that it is lifted up by the load-bearing pin again, and the equivalent mass of the hydraulic cylinder system 2 decreases; by changing the stroke, the hydraulic cylinder system can obtain the corresponding equivalent mass, so as to carry out the dynamic characteristics experiment of the hydraulic cylinder under different equivalent mass loads, and in the process of applying and releasing the load mass block, it only relies on the hydraulic cylinder system itself and the load-bearing pin to bear the load, without the need for additional lifting equipment, reducing the experimental cost and improving safety.

[0054] Example 2:

[0055] Those skilled in the art may understand this embodiment as a more specific description of Embodiment 1.

[0056] This embodiment provides a wave compensation hydraulic cylinder control characteristics test bench, including a base, a hydraulic cylinder system, a load-bearing pin, and a load mass block.

[0057] The base is installed in the experimental site, the hydraulic cylinder system is installed on the base, and the load-bearing pin is fixed on the load-bearing structure of the experimental site.

[0058] The hydraulic cylinder system includes a piston, a piston rod, a piston chamber, and a matching chamber. The piston and the piston rod are fixedly mounted, and the piston and the piston rod are slidable within the piston chamber. The piston chamber and the matching chamber are connected by a pipeline to enable the flow of hydraulic oil between the piston chamber and the matching chamber.

[0059] Given that the lowest hydraulic stiffness of the cylinder is near the middle of the cylinder stroke, the influence of the upper half of the cylinder stroke on the cylinder control characteristics can be reflected in the volume of the piston rod cavity. Therefore, the hydraulic cylinder control characteristics test bench provided in this embodiment uses the lower half of the stroke of the traditional hydraulic cylinder as the experimental range, and replaces the piston rod cavity of the upper half of the stroke with a matching cavity at the same height as the piston cavity, thereby reducing the height of the hydraulic cylinder system while ensuring the accuracy of the hydraulic cylinder control characteristics experimental results.

[0060] The purpose of the test load mass matching is to set the natural frequency of the hydraulic cylinder. The hydraulic cylinder control characteristics test bench provided in this embodiment is characterized in that the load mass block is divided into several blocks of different masses, and the load-bearing pins are installed in the load-bearing structure of the experimental site at certain height intervals, and the load mass blocks are respectively mounted on the load-bearing pins from high to low.

[0061] When the piston rod of the hydraulic cylinder system moves upward, the height of the piston rod exceeds the height of the load-bearing pin, the load mass block is lifted up in sequence by the piston rod, the mass of the lifted load mass block is borne by the piston rod, and the equivalent mass of the hydraulic cylinder system increases; when the piston rod of the hydraulic cylinder system moves downward, the height of the piston rod is lower than the height of the load-bearing pin in sequence, the load mass block is again supported by the load-bearing pin, the equivalent mass of the hydraulic cylinder system is reduced, and the characteristic changes of the hydraulic cylinder system are tested.

[0062] According to changes in experimental requirements, the piston rod of the hydraulic cylinder system can test the influence of the equivalent mass corresponding to different load mass blocks on the control characteristics of the hydraulic cylinder system within different stroke heights. Since the load-bearing pin is permanently fixed to the load-bearing structure of the experimental site, the loading and unloading process of the equivalent mass does not rely on any additional manpower or material resources, reducing the load loading and unloading costs of the hydraulic cylinder control characteristics experiment process and ensuring the safety of the experimenters.

[0063] Furthermore, the hydraulic cylinder system includes a piston, a piston rod, a piston chamber, an oil pipe, an oil tank, and a matching chamber. The piston chamber is installed vertically and fixed to the base by bolts. The base is fixed to the ground by anchor bolts. The piston chamber is connected to the oil tank. The oil tank is equipped with a hydraulic pump motor to pump the hydraulic oil in the oil tank to both ends of the piston chamber to push the piston. The piston and the piston rod are fixedly installed by threaded connection, and the piston can move along the axis in the piston chamber. The matching chamber is connected to the piston chamber by an oil pipe. The inner cavity size of the matching chamber is equal to that of the piston chamber. It is installed vertically at the same height as the piston chamber and fixed to the ground by anchor bolts. The matching chamber is connected to the oil tank, and hydraulic oil can be extracted from the oil tank.

[0064] When the piston moves within the stroke provided by the piston chamber, the oil volume of the matching chamber also changes due to the communication between the piston chamber and the matching chamber oil circuit, causing the overall characteristics of the hydraulic system to exhibit the characteristics of a hydraulic cylinder with a stroke twice the size of the piston chamber. This enables the hydraulic cylinder system to simulate a hydraulic cylinder with a stroke twice its own size, thereby reducing the height requirements of the experimental site.

[0065] Furthermore, the load mass block is divided into four blocks, each of which has a U-shaped design with different inner width dimensions and can be stacked in sequence in the height direction. The load-bearing pins are divided into four pairs and are fixed in sequence on the wall of the experimental site. The load-bearing pins can bear the weight of the corresponding mass block and the mass block above it.

[0066] When the piston rod of the hydraulic cylinder system moves upward, it lifts the corresponding mass block after reaching the corresponding stroke position, causing the hydraulic cylinder system to be subjected to an equivalent load mass. As the stroke increases, the load mass block originally supported on the load-bearing pin is lifted up by the mass block below, causing the equivalent mass of the hydraulic cylinder system to increase. When the piston rod of the hydraulic cylinder system moves downward, the height of the load mass block drops to the height of the load-bearing pin, causing it to be lifted up by the load-bearing pin again, and the equivalent mass of the hydraulic cylinder system decreases. By changing the stroke, the hydraulic cylinder system can obtain the corresponding equivalent mass, so as to conduct dynamic characteristic experiments of the hydraulic cylinder under different equivalent mass loads. In the process of applying and releasing the load mass block, it only relies on the hydraulic cylinder system itself and the load-bearing pin to carry out the load, without the need for additional lifting equipment, reducing the experimental cost and improving safety.

[0067] The present invention changes the hydraulic cavity of the piston rod of the vertical piston hydraulic oil cylinder into a matching cavity, shortens the stroke of the vertical piston hydraulic oil cylinder, and greatly reduces the requirements of the hydraulic servo oil cylinder test bench for wave compensation on the height of the test site.

[0068] In the description of this application, it should be understood that the terms "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and 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, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application.

[0069] The above describes specific embodiments of the present invention. It should be understood that the present invention is not limited to the specific embodiments described above, and those skilled in the art may make various changes or modifications within the scope of the claims, which do not affect the essence of the present invention. The embodiments of this application and the features in the embodiments may be combined with each other in any manner unless there is a conflict.

Claims

1. A wave compensation hydraulic cylinder control characteristics test bench, characterized in that: include: A base (1), a hydraulic cylinder system (2), a load-bearing pin (3), and a load mass block (4); The base (1) is installed in the experimental site, the hydraulic cylinder system (2) is installed on the base (1), the load-bearing pin (3) is fixed on the load-bearing structure of the experimental site, and the load mass block (4) is installed on the load-bearing pin (3); the hydraulic cylinder system (2) is used to lift the load mass block (4); The hydraulic cylinder system (2) comprises a piston (201), a piston rod (202), a piston chamber (203), a matching chamber (204), an oil pipe (205), and an oil tank (206); The piston (201) and the piston rod (202) are fixedly mounted, and the piston (201) and the piston rod (202) are slidably arranged in the piston cavity (203); the piston cavity (203) and the matching cavity (204) are connected, and hydraulic oil flows between the piston cavity (203) and the matching cavity (204); When the piston rod (202) moves upward and the height of the piston rod (202) exceeds the height of the load-bearing pin (3), the load mass block (4) is lifted up by the piston rod (202); When the piston rod (202) moves downward and the height of the piston rod (202) is lower than the height of the load-bearing pin (3), the load mass block (4) is lifted by the load-bearing pin (3); The piston chamber (203) is installed vertically, the piston chamber (203) is fixed to the base (1) by bolts, and the base (1) is fixed to the ground of the experimental site by anchor bolts; The matching cavity (204) is installed vertically, and the matching cavity (204) is fixed to the ground of the experimental site via anchor bolts; The piston cavity (203) and the matching cavity (204) are connected via an oil pipe (205); The matching cavity (204) and the oil tank (206) are arranged in communication, and the matching cavity (204) is capable of extracting hydraulic oil from the oil tank (206); When the piston rod (202) of the hydraulic cylinder system (2) moves upward, after reaching the corresponding stroke position, the corresponding mass block is lifted, so that the hydraulic cylinder system is subjected to an equivalent load mass. As the stroke increases, the mass block originally supported on the load-bearing pin (3) is lifted by the mass block below, so that the equivalent mass of the hydraulic cylinder system (2) increases; when the piston rod (202) of the hydraulic cylinder system (2) moves downward, the height of the load mass block (4) drops to the height of the load-bearing pin, so that it is supported by the load-bearing pin again, and the equivalent mass of the hydraulic cylinder system (2) decreases.

2. The heave compensation hydraulic cylinder control characteristic test bench according to claim 1 is characterized in that: The load-bearing pins (3) are provided in plurality, and the plurality of load-bearing pins (3) are installed in the load-bearing structure of the experimental site at intervals according to preset heights.

3. The heave compensation hydraulic cylinder control characteristic test bench according to claim 2 is characterized in that: The load mass block (4) includes a plurality of mass blocks with different masses, and the plurality of load mass blocks (4) are respectively mounted on the plurality of load-bearing pins (3) from high to low; When the piston rod (202) moves upward, and the height of the piston rod (202) exceeds the heights of the plurality of load-bearing pins (3) in sequence, the plurality of load mass blocks (4) are lifted up in sequence by the piston rod (202); When the piston rod (202) moves downward, the height of the piston rod (202) is successively lower than the heights of the plurality of the load-bearing pins (3), and a plurality of the load mass blocks (4) are successively lifted up by the load-bearing pins (3).

4. The heave compensation hydraulic cylinder control characteristic test bench according to claim 1 is characterized in that: The piston chamber (203) is connected to the oil tank (206) via the oil pipe (205); A hydraulic pump motor is provided in the oil tank (206), and the hydraulic pump motor is used to pump the hydraulic oil in the oil tank (206) into the piston chamber (203).

5. The heave compensation hydraulic cylinder control characteristic test bench according to claim 1 is characterized in that: The inner dimensions of the matching cavity (204) are equal to those of the piston cavity (203), and the matching cavity (204) and the piston cavity (203) are located at the same height.

6. The heave compensation hydraulic cylinder control characteristic test bench according to claim 3 is characterized in that: The load mass block (4) comprises four mass blocks, the four mass blocks are respectively arranged in a U-shape with different inner widths, and the four mass blocks can be stacked in sequence in the height direction; The load-bearing pins (3) are arranged in four pairs, and the four pairs of the load-bearing pins (3) are fixed in sequence on the wall of the experimental site. The load-bearing pins (3) can bear the weight of the corresponding mass block and the mass block stacked thereon.

7. The heave compensation hydraulic cylinder control characteristic test bench according to claim 1 is characterized in that: The piston (201) and the piston rod (202) are fixedly mounted via a threaded connection, and the piston (201) is capable of moving along an axis within the piston chamber (203).

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