Hydraulic system with hydraulic compensation, portal frame and equipment

Abstract

The utility model discloses a hydraulic system with a hydraulic compensation function, a portal frame and equipment, and relates to the technical field of hoisting machinery detection equipment, the hydraulic system with the hydraulic compensation function comprises a control module, a pressure detector, a hydraulic control device and a hydraulic execution device; the control module is connected with the pressure detector and the hydraulic control device, the hydraulic control device is connected with the hydraulic execution device, and the pressure detector is connected with the hydraulic control device and the hydraulic execution device; a two-way pressure detection mechanism is adopted, the internal pressure of the hydraulic control device and the output pressure of the hydraulic execution device are monitored at the same time, and real-time data processing and adjustment control are performed through the control module, so that pressure fluctuation and deviation in the system can be found in time, and then pressure output is accurately compensated through the hydraulic control device. The technical problem that the dynamic load cannot be accurately controlled and adjusted in the hoist inspection process is solved.

Description

Technical Field

[0001] This utility model relates to the field of lifting machinery testing equipment technology, and in particular to a hydraulic system, gantry and equipment with hydraulic compensation. Background Technology

[0002] In modern industrial production, hoists, as one of the most frequently used lifting devices, are widely used in engineering construction, logistics transportation, and factory production. With the continuous improvement of safety standards, inspection specifications have placed more stringent requirements on the performance testing of hoists. Dynamic load testing is a key indicator, comprehensively testing the dynamic performance and stability of the hoist by simulating load changes under actual working conditions to ensure its safety and reliability in actual use.

[0003] Currently, the industry generally uses two methods for hoist testing: one is using a fixed test frame, and the other is using a crane with counterweights. The fixed test frame provides load to the hoist under test through a mechanical structure, and operators judge the hoist's load-bearing capacity by observing the load values. When dynamic performance testing is required, the crane with counterweights is used, simulating actual working loads by hoisting counterweights of different weights. For example, to load test a hoist with a rated lifting capacity of 30 tons, multiple sets of counterweights of different specifications need to be prepared according to the test requirements, and the counterweights are lifted and connected to the hoist under test using a crane.

[0004] However, these existing testing solutions have several technical limitations: First, the testing functions are incomplete. Due to structural design limitations, fixed test racks can only provide constant loads for static load-bearing tests, failing to achieve precise control and adjustment of dynamic loads, making it difficult to comprehensively evaluate the hoist's performance under actual working conditions. Second, testing accuracy is difficult to guarantee. While the crane counterweight solution allows for dynamic testing, load changes during the test are difficult to control precisely, making it impossible to accurately simulate various working conditions. Third, testing efficiency is low. The counterweight solution requires significant manpower for assembling and transporting the counterweights, as well as outsourcing and renting crane equipment, resulting in high testing costs. These problems severely restrict the quality and efficiency of hoist testing, making it difficult to meet the large-scale, standardized testing needs of modern industrial production. Utility Model Content

[0005] The main purpose of this utility model is to propose a hydraulic system, gantry and equipment with hydraulic compensation, which aims to solve the technical problem that the dynamic load cannot be accurately controlled and adjusted during the inspection of hoists.

[0006] To achieve the above objectives, this utility model proposes a hydraulic system with hydraulic compensation, which includes: a control module, a pressure detector, a hydraulic control device, and a hydraulic actuator.

[0007] The control module is connected to the pressure detector and the hydraulic control device, the hydraulic control device is connected to the hydraulic actuator, and the pressure detector is connected to the hydraulic control device and the hydraulic actuator.

[0008] The pressure detector is used to detect the first pressure value in the hydraulic control device and the second pressure value output by the hydraulic actuator in real time, and convert the first pressure value and the second pressure value into a first pressure signal and a second pressure signal.

[0009] The control device is used to send a pressure control signal based on the first pressure signal and the second pressure signal;

[0010] The hydraulic control device is used to send a pressure output signal to the hydraulic actuator according to the pressure control signal and the first pressure signal;

[0011] The hydraulic actuator is used to perform a preset pressure action based on the pressure output signal and the direction signal output by the control module.

[0012] In one embodiment, the control module includes: a signal conversion device and a controller;

[0013] The signal conversion device is connected to the controller and the pressure detector, and the controller is connected to the hydraulic control device;

[0014] The first pressure signal, the second pressure signal, and the pressure control signal are analog signals;

[0015] The signal conversion device is used to convert the first pressure signal and the second pressure signal into digital signals, so that the controller outputs a pressure control digital signal to the signal conversion device according to the first pressure signal and the second pressure signal;

[0016] The signal conversion device is further configured to convert the pressure control digital signal into the pressure control signal;

[0017] The controller is also used to send the direction signal to the hydraulic actuator based on human operation instructions, thereby controlling the movement of the hydraulic actuator.

[0018] In one embodiment, the pressure detector includes: a first pressure sensor and a second pressure sensor;

[0019] The first pressure sensor's acquisition end is connected to the hydraulic control device, and the output end of the first pressure sensor is connected to the input end of the hydraulic control device and the input end of the signal conversion device. The second pressure sensor's acquisition end is connected to the hydraulic actuator, and the output end of the second pressure sensor is connected to the input end of the signal conversion device.

[0020] The first pressure sensor is used to detect the first pressure value in real time, convert the first pressure value into the first pressure signal, and send it to the hydraulic control device and the control module.

[0021] The second pressure sensor is used to detect the second pressure value in real time, convert the second pressure value into the second pressure signal, and send it to the control module.

[0022] In one embodiment, the hydraulic actuator includes: a hydraulic pump and a hydraulic cylinder;

[0023] The hydraulic pump is connected to the hydraulic control device, and the hydraulic cylinder is connected to the hydraulic control device and the acquisition end of the second pressure sensor.

[0024] The hydraulic pump is used to output pressure to the hydraulic cylinder according to the control of the hydraulic control device;

[0025] The hydraulic cylinder is used to perform the preset pressure action according to the direction signal output by the hydraulic control device and the pressure.

[0026] In one embodiment, the hydraulic control device includes: a pressure valve and a directional valve;

[0027] The input end of the pressure valve is connected to the output end of the first pressure sensor and the hydraulic pump. The output end of the pressure valve is connected to the acquisition end of the first pressure sensor and the input end of the reversing valve. The input end of the reversing valve is also connected to the controller. The output end of the reversing valve is connected to the hydraulic cylinder.

[0028] The pressure valve is used to control the pressure output by the hydraulic pump according to the pressure control signal and the first pressure signal, and to output the pressure to the reversing valve;

[0029] The reversing valve is used to output the pressure to the hydraulic cylinder and control the direction of the preset pressure movement according to the pressure output signal and the direction signal.

[0030] In one embodiment, the hydraulic system with hydraulic compensation further includes: a signal isolation device;

[0031] The input terminal of the signal isolation device is connected to the output terminal of the first pressure sensor, the first output terminal of the signal isolation device is connected to the input terminal of the signal conversion device, and the second output terminal of the signal isolation device is connected to the input terminal of the pressure valve.

[0032] The signal isolation device is used to send the first pressure signal to the pressure valve and the signal conversion device respectively.

[0033] In one embodiment, the hydraulically compensated hydraulic system includes: a plurality of second pressure sensors, a plurality of the reversing valves, and a plurality of the hydraulic cylinders;

[0034] The number of the plurality of second pressure sensors, the plurality of the plurality of reversing valves and the plurality of hydraulic cylinders are the same;

[0035] The acquisition ends of several second pressure sensors are respectively connected to several hydraulic cylinders, the output ends of several second pressure sensors are connected to the signal conversion device, the output ends of several directional valves are respectively connected to several hydraulic cylinders, and the input ends of several directional valves are connected to the controller and the hydraulic pump.

[0036] In addition, to achieve the above objectives, this utility model also proposes a gantry with hydraulic compensation, wherein the gantry with hydraulic compensation includes the aforementioned hydraulic system with hydraulic compensation.

[0037] In one embodiment, the hydraulic cylinder is disposed in the crossbeam above the gantry.

[0038] In addition, to achieve the above objectives, this utility model also proposes a hydraulic device with hydraulic compensation, which includes the aforementioned hydraulic system with hydraulic compensation.

[0039] This invention provides a hydraulic system with hydraulic compensation. Specifically, this hydraulic system achieves precise pressure control and dynamic compensation through the coordinated operation of a control module, a pressure detector, a hydraulic control device, and a hydraulic actuator. The specific working process is as follows: the pressure detector simultaneously monitors a first pressure value inside the hydraulic control device and a second pressure value output by the hydraulic actuator, converting these two pressure values ​​into corresponding pressure signals and transmitting them to the control module. Based on the received dual-channel pressure signals, the control module generates a pressure control signal through internal comparison and processing. After receiving the pressure control signal from the control module, the hydraulic control device combines it with the current first pressure signal to calculate the final pressure output signal, which is then sent to the hydraulic actuator. The hydraulic actuator precisely executes the preset pressure action according to the received pressure output signal, thereby achieving real-time compensation and adjustment of the system pressure.

[0040] This application employs a dual-path pressure detection mechanism, simultaneously monitoring the internal pressure of the hydraulic control device and the output pressure of the hydraulic actuator. Real-time data processing and adjustment are performed by the control module, enabling timely detection of pressure fluctuations and deviations within the system. This allows for precise compensation of the pressure output through the hydraulic control device. This design effectively solves the technical problems of low pressure control accuracy, slow response speed, and untimely compensation in traditional hydraulic systems, thereby achieving high-precision dynamic adjustment and real-time compensation of system pressure. Furthermore, this system offers the following advantages: First, dual-path pressure detection provides more comprehensive system status information, making pressure control more accurate and reliable; second, the control module can quickly make adjustment decisions based on the comparison results of the two pressure signals, improving the system's response speed; finally, the hydraulic control device considers its own pressure state when performing pressure adjustment, further enhancing control stability and reliability. The organic combination of these technical features enables this hydraulically compensated system to meet the requirements of high-precision, fast-response pressure control, solving the technical problem of inability to achieve precise control and adjustment of dynamic loads during hoist inspection. Attached Figure Description

[0041] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0042] Figure 1 A schematic diagram of a module structure provided for a first embodiment of the hydraulic system with hydraulic compensation in this application;

[0043] Figure 2 A schematic diagram of a module structure provided for Embodiment 2 of the hydraulic system with hydraulic compensation in this application;

[0044] Figure 3 A schematic diagram of a module structure provided for Embodiment 3 of the hydraulic system with hydraulic compensation in this application;

[0045] Figure 4 Another schematic diagram of a module structure provided for Embodiment 3 of the hydraulic system with hydraulic compensation in this application;

[0046] Figure 5 This is a structural diagram of the gantry with hydraulic compensation according to this application.

[0047] Explanation of icon numbers:

[0048]

[0049] The purpose, features, and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0050] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present utility model.

[0051] It should be noted that if the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicators will also change accordingly.

[0052] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the use of "and / or" or "and / or" throughout the text includes three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0053] This application presents a schematic diagram of a hydraulic system with hydraulic compensation according to the first embodiment. Please refer to... Figure 1 The hydraulic system with hydraulic compensation includes: a control module 10, a pressure detector 40, a hydraulic control device 20, and a hydraulic actuator 30;

[0054] The control module 10 is connected to the pressure detector 40 and the hydraulic control device 20. The hydraulic control device 20 is connected to the hydraulic actuator 30. The pressure detector 40 is connected to the hydraulic control device 20 and the hydraulic actuator 30.

[0055] The control module 10 refers to the core control unit used to process pressure signals and generate control commands. It is mainly composed of a microcontroller 101 or a programmable logic controller 101, and includes signal processing circuits, pre-stored control algorithms, and communication interfaces. The pressure detector 40 represents a measuring device used for real-time detection of system pressure. It consists of a pressure sensor, a signal amplification circuit, and a signal conditioning circuit, and can convert physical pressure into an electrical signal output. The hydraulic control device 20 refers to the actuator used to regulate and control the pressure of the hydraulic system, mainly including devices that control pressure output such as a proportional pressure valve 201 and a directional valve 202. The hydraulic actuator 30 represents the execution unit that ultimately performs the pressure action, and is typically composed of actuators such as a hydraulic cylinder 302 and a hydraulic motor (or hydraulic pump 301).

[0056] These devices work in precise coordination to achieve real-time pressure compensation for the system. The pressure detector 40, as the system's sensing unit, is responsible for real-time monitoring of two key pressure points: the system pressure inside the hydraulic control unit 20 and the actual output pressure of the hydraulic actuator 30. The pressure detector 40 uses a high-precision pressure sensor to convert the detected physical pressure into a first pressure signal and a second pressure signal. When corresponding signal processing is required, the first and second pressure signals can be amplified and filtered by a signal conditioning circuit before being input to the control module 10.

[0057] As the system's decision center, control module 10 first converts the received analog pressure signal into a digital quantity using a multi-channel A / D converter. Then, based on its built-in PID control algorithm, it compares the preset target pressure value with the two actual detected pressure values ​​to calculate the pressure deviation. Based on the deviation, control module 10 accurately calculates the required pressure compensation amount through the proportional, integral, and derivative components of the PID algorithm and generates a corresponding pressure control signal, which is a digital signal.

[0058] Specifically, once the system is operational, the pressure detector 40 first samples the internal pressure P1 of the hydraulic control device 20 and the output pressure P2 of the hydraulic actuator 30 in real time. The sampling period is typically set within 10ms to ensure real-time control. These two pressure signals are then conditioned and converted into a first pressure signal and a second pressure signal (which can be standard electrical signals of 4-20mA or 0-5V), and transmitted to the signal input terminal of the control module 10 via a shielded cable. The A / D converter of the control module 10 converts the analog signal into a digital quantity with at least 12 bits of precision, ensuring the accuracy of the pressure data.

[0059] The PID control algorithm of control module 10 runs continuously, constantly calculating the pressure deviation value. Based on the deviation value, a compensation control quantity is calculated. The calculated control quantity is then output to the hydraulic control device 20 as a pressure control signal.

[0060] After receiving the pressure control signal, the hydraulic control device 20 precisely adjusts the valve core opening according to the signal magnitude using an internal electro-hydraulic proportional valve, achieving continuous regulation of the output pressure. Finally, under the regulated pressure, the hydraulic actuator 30 executes specific actions such as displacement and rotational speed, realizing closed-loop pressure compensation control throughout the system. Through this high-precision, fast-response pressure detection-control-execution loop, the system can control pressure fluctuations within ±1%, meeting the control requirements of precision hydraulic systems.

[0061] In summary, in this embodiment, the hydraulically compensated hydraulic system achieves precise pressure control and dynamic compensation through the coordinated operation of the control module 10, pressure detector 40, hydraulic control device 20, and hydraulic actuator 30. Specifically, the pressure detector 40 simultaneously monitors the first pressure value inside the hydraulic control device 20 and the second pressure value output by the hydraulic actuator 30, converting these two pressure values ​​into corresponding pressure signals and transmitting them to the control module 10. Based on the received pressure signals, the control module 10 generates a pressure control signal through internal comparison processing. After receiving the pressure control signal from the control module 10, the hydraulic control device 20 combines it with the current first pressure signal to calculate the final pressure output signal, which is then sent to the hydraulic actuator 30. The hydraulic actuator 30 precisely executes the preset pressure action according to the received pressure output signal, thereby achieving real-time compensation and adjustment of the system pressure.

[0062] In some embodiments, the function of the control module 10 can be implemented in several ways: Optionally, a PLC control method can be used, specifically including: first, configuring the PLC's analog input card to receive pressure signals; then, writing a ladder diagram program to implement PID calculations and data processing; and finally, outputting control signals through the analog output card. Optionally, an industrial computer control method can be used, specifically including: first, acquiring pressure signals through a data acquisition card; then, running host computer software for real-time data processing and control calculations; and finally, outputting analog control signals to the actuator. It is understood that other control methods such as microcontroller control and FPGA control can also be used to implement the control function, which is not limited here.

[0063] In some embodiments, the pressure detector 40 can function in several ways: Optionally, an integrated pressure sensor solution can be used, specifically including: first, installing a pressure sensor with signal conditioning circuitry at the pressure measurement point; then connecting the power supply and signal line; and finally transmitting a 4-20mA standard signal to the control cabinet via a shielded cable. Optionally, a combined sensor solution can be used, specifically including: first, installing the pressure sensor body; then connecting an external signal conditioning module; and finally transmitting pressure data via a digital bus. It is understood that other types of pressure detection solutions, such as piezoelectric or capacitive types, can also be used, and are not limited here.

[0064] In some embodiments, the function of the hydraulic control device 20 can be achieved in several ways: Optionally, an electro-hydraulic proportional valve scheme can be used, specifically including: first installing a proportional relief valve, then connecting a proportional amplifier, and finally controlling the pressure regulation by controlling an electromagnet; Optionally, a servo valve scheme can be used, specifically including: first installing a high-frequency response servo valve, then connecting a servo controller 101, and finally achieving precise pressure control through position feedback. It is understood that other types of control schemes, such as cartridge valves, electro-proportional pressure reducing valves, etc., can also be used, and are not limited here.

[0065] In some embodiments, the function of the hydraulic actuator 30 can be achieved in several ways: Optionally, a hydraulic cylinder 302 can be used, with the specific steps including: first selecting a hydraulic cylinder 302 of suitable specifications, then installing a displacement sensor, and finally protecting the stroke through a limit switch; alternatively, a hydraulic motor can be used, with the specific steps including: first installing a fixed-displacement hydraulic motor, then connecting a speed sensor, and finally achieving speed control through an encoder. It is understood that other actuators such as a swing hydraulic cylinder 302 or a differential hydraulic cylinder 302 can also be used, and this is not limited here.

[0066] In this application, a dual-path pressure detection mechanism is adopted, simultaneously monitoring the internal pressure of the hydraulic control device 20 and the output pressure of the hydraulic actuator 30. Real-time data processing and adjustment are performed through the control module 10, enabling timely detection of pressure fluctuations and deviations in the system. This allows for precise compensation of the pressure output through the hydraulic control device 20. This design effectively solves the technical problems of low pressure control accuracy, slow response speed, and untimely compensation in traditional hydraulic systems, thereby achieving high-precision dynamic adjustment and real-time compensation of system pressure. Furthermore, this system offers the following advantages: First, dual-path pressure detection provides more comprehensive system status information, making pressure control more accurate and reliable; second, the control module 10 can quickly make adjustment decisions based on the comparison results of the two pressure signals, improving the system's response speed; finally, the hydraulic control device 20 considers its own pressure state when performing pressure adjustment, further enhancing the stability and reliability of the control. The organic combination of these technical features enables this hydraulically compensated system to meet the requirements of high-precision, fast-response pressure control, solving the technical problem of inability to achieve precise control and adjustment of dynamic loads during hoist inspection.

[0067] Based on the first embodiment of this application, in the second embodiment of this application, the content that is the same as or similar to that in Embodiment 1 above can be referred to the above description, and will not be repeated hereafter. Based on the first embodiment, this embodiment further proposes a more specific structure of a hydraulic system with hydraulic compensation, refer to... Figure 2 ,as follows:

[0068] Optionally, the control module 10 includes: a signal conversion device 102 and a controller 101;

[0069] The signal conversion device 102 is connected to the controller 101 and the pressure detector 40, and the controller 101 is connected to the hydraulic control device 20;

[0070] The pressure detector 40 includes: a first pressure sensor 401 and a second pressure sensor 402;

[0071] The first pressure sensor 401 is connected to the hydraulic control device 20 at its acquisition end, and the output end of the first pressure sensor 401 is connected to the input end of the hydraulic control device 20 and the input end of the signal conversion device 102. The second pressure sensor 402 is connected to the hydraulic actuator 30 at its acquisition end, and the output end of the second pressure sensor 402 is connected to the input end of the signal conversion device 102.

[0072] The hydraulic actuator 30 includes: a hydraulic pump 301 and a hydraulic cylinder 302;

[0073] The hydraulic pump 301 is connected to the hydraulic control device 20, and the hydraulic cylinder 302 is connected to the hydraulic control device 20 and the acquisition end of the second pressure sensor 402.

[0074] The hydraulic control device 20 includes: a pressure valve 201 and a directional valve 202;

[0075] The input end of the pressure valve 201 is connected to the output end of the first pressure sensor 401 and the hydraulic pump 301. The output end of the pressure valve 201 is connected to the acquisition end of the first pressure sensor 401 and the input end of the directional valve 202. The input end of the directional valve 202 is also connected to the controller 101. The output end of the directional valve 202 is connected to the hydraulic cylinder 302.

[0076] The signal conversion device 102 refers to the hardware device used to convert analog pressure signals into digital signals, including analog-to-digital converters and digital-to-analog converters. This solution uses the AM06 analog signal module. This device represents the key link in realizing the mutual conversion between analog and digital pressure signals. It is used to convert the analog voltage or current signal output by the pressure sensor into a digital signal that the controller 101 can process, and at the same time, it converts the digital control quantity output by the controller 101 into the analog signal required to drive the actuator, such as a pressure control signal.

[0077] Specifically, the signal conversion device 102 acquires the first and second pressure signals (analog signals) output by the first and second pressure sensors 401 and 402 respectively, which are 4-20mA or 0-5V. These signals are first preprocessed by an input protection circuit and a signal conditioning circuit, and then converted into binary digital quantities by a 12-bit or 16-bit ADC chip. The converted first and second pressure signals are transmitted to the controller 101 for processing via a data bus. After the controller 101 calculates the pressure control quantity, the digital-to-analog conversion section of the signal conversion device 102 converts the received pressure control signal (digital signal) into a standard analog signal form of pressure control signal through a 12-bit DAC chip, and outputs it to the hydraulic control device 20 after drive amplification.

[0078] In some embodiments, the signal conversion function can also be implemented in several ways: Optionally, an integrated signal conversion scheme can be used, the specific steps of which include: first selecting a multi-channel data acquisition module, then configuring sampling parameters and ranges, then connecting signal lines and power supply, and finally communicating with controller 101 through an isolation protection circuit; Optionally, a discrete signal conversion scheme can be used, the specific steps of which include: first building a signal conditioning circuit, then connecting independent ADC and DAC chips, then writing a data acquisition program, and finally exchanging data with controller 101 through a serial interface. It is understood that other signal conversion methods such as direct FPGA sampling and DSP processing can also be used to implement the signal conversion function, and this is not limited here.

[0079] The controller 101 is the core processing unit used to execute the pressure compensation control algorithm. It receives and processes digitized pressure signals and outputs corresponding control commands according to the pre-designed control algorithm. This device is used to realize the core functions of the system, such as real-time data processing, logical judgment, and PID calculation. It is also responsible for communication and data interaction with external devices.

[0080] Specifically, controller 101 first receives digitized first and second pressure signals from signal conversion device 102. These data first enter a digital filtering unit for noise filtering, and then are compared with a preset pressure value to calculate the pressure difference. Based on the pressure difference value, controller 101 calls its built-in PID control algorithm to calculate the compensation amount. After limiting and adjusting, the compensation amount is converted into a pressure control digital signal. Simultaneously, controller 101 also handles other auxiliary functions, such as system status monitoring, fault diagnosis, data storage, and human-machine interaction. During the control process, controller 101 executes the program cyclically with a fixed sampling period (typically 1-10ms) to ensure the system's real-time performance and control accuracy.

[0081] The specific implementation of controller 101 needs to consider several technical factors: First, the computational performance requirement, which must ensure that all data processing and algorithm calculations can be completed within the specified control cycle; second, the reliability requirement, which requires industrial-grade anti-interference capability and environmental adaptability; third, the scalability requirement, which should reserve sufficient I / O interfaces and communication ports to support system function expansion; and finally, the maintainability requirement, which requires the ability to debug programs and modify parameters online. These factors together determine the specific selection and implementation scheme of controller 101.

[0082] In some embodiments, the controller 101 function can be implemented in several ways: Optionally, an industrial PLC control scheme can be adopted, with specific steps including: first, selecting a suitable PLC host model; then, writing ladder diagrams or structured text programs; next, configuring communication parameters and control cycles; and finally, implementing a human-machine interface through configuration software. Optionally, an embedded controller 101 scheme can be adopted, with specific steps including: first, designing hardware circuits based on an ARM processor; then, porting a real-time operating system; next, writing C language control programs; and finally, implementing operation control through a touch screen. It is understood that other control methods, such as industrial PCs or DSP controllers 101, can also be used to implement system control functions, and this is not limited here.

[0083] The first pressure sensor 401 is a measuring element installed at the hydraulic control device 20 (specifically, at the connection between the pressure valve 201 and the hydraulic cylinder 302) to detect the output pressure. It represents a sensing device that converts hydraulic pressure signals into electrical signals, used to monitor the output pressure value of the hydraulic control device 20 (specifically, the pressure valve 201) in real time and convert it into a standard electrical signal. The second pressure sensor 402 is a measuring element installed at the hydraulic actuator 30 (specifically, at the pressure output end of the hydraulic cylinder 302) to detect the actual working pressure. It represents a sensing device that converts the pressure signal at the actuator end (pressure output end) into an electrical signal, used to monitor the actual pressure value of the hydraulic actuator 30 in real time and convert it into a standard electrical signal.

[0084] Specifically, the first pressure sensor 401 and the second pressure sensor 402 operate on the same principle, but their installation locations and monitoring purposes differ. When the system is running, the first pressure sensor 401 converts the pressure output from the hydraulic control device 20 (specifically, pressure valve 201) into a first pressure signal. After amplification and filtering by the internal signal conditioning circuit, it outputs a standard 4-20mA or 0-5V signal to the control module 10 and the hydraulic control device 20. The second pressure sensor 402 detects the actual working pressure of the hydraulic actuator 30 (specifically, hydraulic cylinder 302) in real time and similarly converts the pressure value into a second pressure signal, which is then output to the control module 10. By comparing the signals from the two sensors (primarily the first pressure signal, with the second pressure signal used for data comparison), a pressure compensation value can be obtained, providing a basis for the system's pressure control. Both pressure sensors use high-precision pressure-sensitive elements and, where necessary, are also equipped with temperature compensation circuits and zero-point calibration functions to ensure measurement accuracy. The signal output uses a three-wire or four-wire wiring method and is transmitted through a high-quality shielded cable to effectively avoid external interference.

[0085] The selection of the first pressure sensor 401 and the second pressure sensor 402 requires comprehensive consideration of several factors: First, the measurement range must match the system's working pressure, generally selecting a full-scale range of 1.5 times the maximum working pressure; second, the accuracy class must meet the control requirements, typically selecting a 0.5 or 0.25 class sensor; third, the response characteristics must adapt to the system's dynamic requirements, with a response time generally required to be within 10ms; and finally, the protection level must meet the requirements of the working environment. Through proper selection and installation, the accuracy and reliability of pressure detection can be ensured.

[0086] In some embodiments, pressure detection can be achieved in several ways: Optionally, a piezoresistive sensor solution can be used, with the following steps: first, install the piezoresistive sensor at the pressure measurement point; then, connect the signal conditioning circuit and temperature compensation circuit; next, perform zero-point and full-scale calibration; and finally, lead out the signal line through a waterproof connector. Optionally, a ceramic capacitive sensor solution can be used, with the following steps: first, select a ceramic capacitive sensor with a suitable range; then, install it on a dedicated pressure connector; next, connect it to an intelligent transmitter circuit; and finally, set the alarm value and protection parameters. It is understood that other types of pressure sensors, such as diffused silicon or piezoelectric sensors, can also be used to achieve pressure detection; this is not limited here.

[0087] Hydraulic pump 301 refers to the power element that converts mechanical energy into hydraulic energy, representing the system's pressure source, used to provide the required pressure and flow to the hydraulic system. This device, driven by a motor, pressurizes the working fluid and delivers it to various oil-using points in the system. Hydraulic cylinder 302 refers to the actuator that converts hydraulic energy into mechanical energy, representing the system's final actuator, used to achieve linear reciprocating motion under pressure to complete various mechanical actions.

[0088] Specifically, when hydraulic pump 301 is working, the motor drives the pump shaft to rotate, generating volume changes through the pump's working mechanism (such as pistons, gears, or vanes), compressing the low-pressure oil that is drawn in and outputting high-pressure oil. The output pressure and flow rate are determined by the pump's displacement, speed, and system load. After receiving pressurized oil from hydraulic control device 20, the piston of hydraulic cylinder 302 generates thrust under pressure, driving the piston rod to move linearly. The direction of movement is controlled by directional valve 202, the speed is determined by flow rate, and the magnitude of force is determined by pressure. During system operation, hydraulic pump 301 continuously outputs pressurized oil, which, after being regulated by pressure valve 201 and distributed by directional valve 202, drives hydraulic cylinder 302 to complete the preset action requirements. To ensure stable system operation, both hydraulic pump 301 and hydraulic cylinder 302 are equipped with corresponding protection devices, such as relief valves and buffer devices.

[0089] In some embodiments, the function of hydraulic pump 301 can be implemented in several ways: Optionally, a rated power hydraulic pump 301 scheme can be adopted, the specific steps of which include: firstly, selecting a hydraulic pump 301 with appropriate power according to the maximum pressure requirement of the system; then configuring pressure monitoring and safety protection devices; next, installing an oil storage and replenishment system; and finally, adjusting the system pressure and flow parameters. Optionally, a multi-stage power hydraulic pump 301 scheme can be adopted, the specific steps of which include: firstly, selecting a group of hydraulic pumps 301 with corresponding power according to different load levels and control accuracy requirements; then installing pressure and flow detection devices; next, configuring an intelligent switching control system; and finally, achieving automatic power adjustment through controller 101. It is understood that other types, such as variable frequency pumps and series pumps, can also be used to achieve the power output function, which is not limited here.

[0090] In some embodiments, the function of hydraulic cylinder 302 can be implemented in several ways: Optionally, a staged hydraulic cylinder 302 scheme can be adopted, the specific steps of which include: firstly, selecting a suitable cylinder diameter according to the load size and accuracy requirements; then, determining the piston stroke according to the working requirements; next, configuring a position detection system; and finally, adjusting the dynamic characteristics and sealing performance. Optionally, a precision control hydraulic cylinder 302 scheme can be adopted, the specific steps of which include: firstly, selecting a high-precision machined piston cylinder assembly; then, installing a high-resolution displacement detection device; next, configuring a proportional control system; and finally, achieving precise position control through closed-loop control. It is understood that other types, such as multi-stage cylinders and compound cylinders, can also be used to achieve the execution function, and this is not limited here.

[0091] Pressure valve 201 refers to a control element that controls and regulates system pressure, representing the system's pressure control device, used to limit or regulate the working pressure of the hydraulic system. This device achieves pressure control and regulation functions through the principle of valve core force balance. Directional control valve 202 refers to a control element that controls the direction of hydraulic oil flow, representing the system's directional control device, used to change the direction of oil flow, thereby controlling the movement direction of the actuator.

[0092] Specifically, the working process of pressure valve 201 and directional valve 202 is as follows: Pressure valve 201 detects the pressure output by the first pressure sensor 401 in real time and feeds back the first pressure signal to the internal control circuit of pressure valve 201. The controller 101 of pressure valve 201 simultaneously receives external pressure control signals and the system's first pressure signal. Based on the combined effect of the two signals, dynamic compensation and adjustment of pressure are achieved by adjusting the preload of the internal spring or electromagnetic force of pressure valve 201. After receiving the directional control signal, directional valve 202 generates thrust through an electromagnet or hydraulic pilot to overcome the valve core return spring force, pushing the valve core to a designated position, thereby changing the internal oil circuit connection state and realizing the switching control of oil flow direction. The switching sequence is determined by the control system according to process requirements, the action speed depends on the magnitude of the driving force, and stability is ensured by the valve core positioning structure. During system operation, pressure valve 201 continuously adjusts pressure based on pressure control signals and the first pressure signal, while directional valve 202 switches the oil flow direction based on direction signals. The two work together to ensure stable and controllable system pressure and reliable switching of movement direction. To guarantee control reliability, pressure valve 201 is equipped with overflow protection and pressure compensation functions, while directional valve 202 is equipped with position locking and status detection devices. The system also features safety protection functions such as emergency shutdown and fault alarm.

[0093] Optional, see reference Figure 3 This embodiment also proposes a hydraulic system with hydraulic compensation, which further includes a signal isolation device 50.

[0094] The input terminal of the signal isolation device 50 is connected to the output terminal of the first pressure sensor 401, the first output terminal of the signal isolation device 50 is connected to the input terminal of the signal conversion device 102, and the second output terminal of the signal isolation device 50 is connected to the input terminal of the pressure valve 201.

[0095] The signal isolation device 50 represents an electronic device used for signal distribution and isolation, distributing a single input signal to multiple output terminals while ensuring electrical isolation between the output channels. The first pressure signal output by the first pressure sensor 401 needs to be provided to multiple control units simultaneously. The signal conversion device 102 represents a signal processing unit that converts the pressure signal into a specified form for system control and data acquisition. The pressure valve 201 refers to an actuator that regulates pressure based on the pressure signal and needs to receive pressure feedback signals for closed-loop control. The input and output terminals refer to the signal interfaces of the signal isolation device 50, used to implement signal input and distribution output functions.

[0096] The main function of the signal isolation device 50 is to solve the problem of insufficient output ports of the signal conversion device 102. When the selected signal conversion device 102 has insufficient output ports, it receives the pressure signal from the first pressure sensor 401, replicates and isolates it, and distributes it to the signal conversion device 102 and the pressure valve 201, thereby expanding the function of one signal input and multiple signal outputs. Specifically, the signal isolation device 50 first receives the analog pressure signal output by the first pressure sensor 401 through its input terminal, then replicates the single signal into multiple identical signals through the signal distribution circuit, and then achieves electrical isolation between each signal channel through the isolation circuit, ensuring that the output channels do not interfere with each other. The first output channel is connected to the signal conversion device 102 to solve the problem of insufficient output ports; the second output channel is connected to the pressure valve 201 and provides the feedback signal required for the pressure closed-loop control of the pressure valve 201. Through this signal distribution and isolation method, the signal distribution capability is expanded, and the signal quality and electrical isolation characteristics of each output channel are guaranteed.

[0097] In some embodiments, signal distribution and isolation functions can be implemented in several ways: Optionally, an analog signal distribution scheme can be used, with the following steps: first, the input signal is amplified by a high-precision operational amplifier; then, a multi-channel analog switching circuit is used to replicate and distribute the signal; next, each signal is electrically isolated by an independent isolation amplifier; then, amplitude adjustment and impedance matching are performed by a signal conditioning circuit; finally, the signal is output to each independent channel. Optionally, a digital signal distribution scheme can be used, with the following steps: first, the analog input signal is converted into a digital signal by an analog-to-digital converter; then, a digital signal processor is used to replicate the signal; next, a digital isolator is used to isolate each digital signal; then, a digital-to-analog converter is used to convert the digital signal back to an analog signal; finally, the signal is output to each channel by an output buffer amplifier. It is understood that other types of signal distribution and isolation functions, such as bus distribution and digital fiber optic isolation, can also be used, and are not limited here.

[0098] In this embodiment, the system employs a control module 10 consisting of a signal conversion device 102 and a controller 101, along with a pressure detector 40 composed of a first pressure sensor 401 and a second pressure sensor 402, and a hydraulic control device 20 including a pressure valve 201 and a directional valve 202. Through a signal isolation device 50, signal splitting is achieved, enabling bidirectional conversion and precise control of analog signals (first pressure signal, second pressure signal, and pressure control signal) with digital signals. This achieves closed-loop management of the entire process of pressure signal acquisition, conversion, processing, and control, effectively solving many technical problems in signal processing in traditional hydraulic systems, such as low control accuracy due to interference of analog signals, system response lag due to inconsistent signal acquisition and processing, and poor coordination between pressure control and directional control. This results in several technological innovations and functional improvements: Firstly... The system establishes a complete pressure monitoring network by using a first pressure sensor 401 and a second pressure sensor 402 to monitor the pressure status of the hydraulic control device 20 and the hydraulic actuator 30 in real time. Secondly, the signal conversion device 102 enables bidirectional conversion between analog and digital signals, improving signal processing accuracy and anti-interference capabilities. Thirdly, the signal isolation device 50 ensures that the first pressure signal can be transmitted simultaneously and independently to the pressure valve 201 and the signal conversion device 102, avoiding signal crosstalk. Furthermore, based on the digital processing results, the controller 101 can precisely regulate the pressure of the pressure valve 201 and precisely control the movement direction of the hydraulic cylinder 302 through the directional valve 202, achieving coordinated optimization of pressure and direction control. Finally, the system continuously monitors and adjusts the working state through a closed-loop feedback mechanism, ensuring the stability and reliability of the hydraulic system under various working conditions. This innovative system architecture not only improves control accuracy and response speed but also enhances the system's anti-interference capability and adaptability, providing reliable technical support for the intelligent control of hydraulic systems.

[0099] Based on the first and / or second embodiments of this application, in the third embodiment of this application, the contents that are the same as or similar to those in the first and second embodiments described above can be referred to the above description and will not be repeated hereafter.

[0100] This embodiment proposes a hydraulic system with hydraulic compensation having several hydraulic cylinders 302 of different models, referencing... Figure 4 ,as follows:

[0101] The hydraulic system with hydraulic compensation includes: several second pressure sensors 402, several directional valves 202 and several hydraulic cylinders 302;

[0102] The number of second pressure sensors 402, reversing valves 202 and hydraulic cylinders 302 are the same.

[0103] The acquisition ends of several second pressure sensors 402 are connected to several hydraulic cylinders 302 one by one. The output ends of several second pressure sensors 402 are connected to signal conversion device 102. The output ends of several directional valves 202 are connected to several hydraulic cylinders 302 one by one. The input ends of several directional valves 202 are connected to controller 101 and hydraulic pump 301.

[0104] The multi-cylinder hydraulic system employs different models of hydraulic cylinders 302 to meet the pressure and displacement requirements of different workstations. For example, large-tonnage hydraulic cylinders 302 are used for heavy-duty operations, medium-sized hydraulic cylinders 302 are used for motion control under medium loads, and small hydraulic cylinders 302 perform precision positioning tasks under light loads. Each hydraulic cylinder 302 is equipped with a correspondingly matched second pressure sensor 402 to ensure accurate monitoring of the working status within different pressure ranges.

[0105] The working principle of the hydraulically compensated hydraulic system with several different models of hydraulic cylinders 302 in this embodiment is similar to that of a hydraulically compensated system. The main function of the multi-cylinder hydraulic system is to achieve independent control under different work positions and load conditions. Specifically, the hydraulic pump 301 first provides a basic pressure oil source to the system, and the pressure compensation device ensures that different work positions obtain the required pressure level. According to the model and load requirements of each hydraulic cylinder 302, the system automatically adjusts the working pressure supplied to each cylinder. The large hydraulic cylinders 302 in the heavy-load work position obtain higher pressure (e.g., 20-35MPa), the hydraulic cylinders 302 in the medium-load work position maintain medium pressure (e.g., 10-20MPa), and the precision hydraulic cylinders 302 in the light-load work position maintain lower pressure (e.g., 5-10MPa). During the motion control process, the controller 101 realizes the independent operation of the hydraulic cylinders 302 by controlling the conduction state of each reversing valve 202, starts the hydraulic cylinders 302 of the corresponding different work positions according to the process requirements, and automatically adjusts the reversing time according to the characteristics of different cylinders. Each second pressure sensor 402 continuously monitors the actual pressure of its corresponding hydraulic cylinder 302. The signal conversion device 102 processes pressure signals from different ranges uniformly. The controller 101 compares the deviation of each cylinder's pressure from the set requirements in real time, and quickly adjusts the pressure or activates the protection program when an abnormality occurs. In terms of precise control, large hydraulic cylinders 302 prioritize the stability of pressure output, medium-sized hydraulic cylinders 302 emphasize the controllability of movement, and small hydraulic cylinders 302 emphasize positioning accuracy. Through this differentiated configuration and independent control strategy, the system can meet the complex process requirements under different workstations and load conditions, achieving the integrated realization of multiple functions within the same system. Simultaneously, the independent pressure monitoring and compensation mechanisms for each hydraulic cylinder 302 ensure reliable operation and precise control under different load conditions, effectively improving the system's working efficiency and control accuracy.

[0106] In this embodiment, the system employs multiple hydraulic cylinders 302 of different models, each with its own independent pressure sensor and directional valve 202. Differential pressure supply and precise control are achieved through a hydraulic compensation device. Therefore, the system can automatically adjust the supply pressure according to the load characteristics and process requirements of different workstations (20-35 MPa for heavy-load workstations, 10-20 MPa for medium-load workstations, and 5-10 MPa for light-load workstations). The system ensures that different workstations receive the required pressure levels through the pressure compensation device. Each hydraulic cylinder 302 is equipped with a second pressure sensor 402 matching its range to ensure accurate monitoring of the working status within different pressure ranges. Signal conversion... Device 102 processes pressure signals from different ranges uniformly and inputs them into controller 101 for analysis and decision-making. This effectively solves many technical problems existing in traditional hydraulic systems when facing different load conditions, such as energy waste due to unreasonable pressure distribution, poor system adaptability that fails to meet diverse needs, and low control precision that restricts process quality. It then achieves the integrated application of multiple functions within a unified system, including pressure output stability at heavy-load positions, motion control at medium-load positions, and precise positioning at light-load positions. Furthermore, through independent pressure monitoring and compensation mechanisms for each hydraulic cylinder 302, reliable operation and precise control of the system under different load conditions are ensured. The system can flexibly adjust the pressure output of each position according to process requirements to meet the differentiated requirements of different load conditions. It can also be managed through zoned control or adaptive control schemes, configuring an independent pressure compensation unit and control strategy for each hydraulic cylinder 302. When abnormal situations occur, the system can adjust or activate protection programs in a timely manner based on pressure feedback, further improving the system's safety and reliability.

[0107] This application also provides a gantry with hydraulic compensation, which can be referred to. Figure 5 The gantry with hydraulic compensation is equipped with the aforementioned hydraulic compensation hydraulic system, and the hydraulic cylinder is located in the crossbeam above the gantry.

[0108] Among them, the manual hoist tensile testing machine is used to control the entire hydraulic system with hydraulic compensation so that the hydraulic cylinder can perform the required movements.

[0109] This application embodiment also provides a hydraulic device with hydraulic compensation, wherein the hydraulic device with hydraulic compensation is provided with the above-mentioned hydraulic system with hydraulic compensation.

[0110] The above description is merely an exemplary embodiment of the present utility model and does not limit the patent scope of the present utility model. Any equivalent structural transformations made based on the technical concept of the present utility model and the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present utility model.

Claims

1. A hydraulic system with hydraulic compensation, characterized in that, The hydraulic system with hydraulic compensation includes: a control module, a pressure detector, a hydraulic control device, and a hydraulic actuator; The control module is connected to the pressure detector and the hydraulic control device, the hydraulic control device is connected to the hydraulic actuator, and the pressure detector is connected to the hydraulic control device and the hydraulic actuator. The pressure detector is used to detect the first pressure value in the hydraulic control device and the second pressure value output by the hydraulic actuator in real time, and convert the first pressure value and the second pressure value into a first pressure signal and a second pressure signal. The control device is used to send a pressure control signal based on the first pressure signal and the second pressure signal; The hydraulic control device is used to send a pressure output signal to the hydraulic actuator according to the pressure control signal and the first pressure signal; The hydraulic actuator is used to perform a preset pressure action based on the pressure output signal and the direction signal output by the control module.

2. The hydraulic system with hydraulic compensation as described in claim 1, characterized in that, The control module includes: a signal conversion device and a controller; The signal conversion device is connected to the controller and the pressure detector, and the controller is connected to the hydraulic control device; The first pressure signal, the second pressure signal, and the pressure control signal are analog signals; The signal conversion device is used to convert the first pressure signal and the second pressure signal into digital signals, so that the controller outputs a pressure control digital signal to the signal conversion device according to the first pressure signal and the second pressure signal; The signal conversion device is further configured to convert the pressure control digital signal into the pressure control signal; The controller is also used to send the direction signal to the hydraulic actuator based on human operation instructions, thereby controlling the movement of the hydraulic actuator.

3. The hydraulic system with hydraulic compensation as described in claim 2, characterized in that, The pressure detector includes: a first pressure sensor and a second pressure sensor; The first pressure sensor's acquisition end is connected to the hydraulic control device, and the output end of the first pressure sensor is connected to the input end of the hydraulic control device and the input end of the signal conversion device. The second pressure sensor's acquisition end is connected to the hydraulic actuator, and the output end of the second pressure sensor is connected to the input end of the signal conversion device. The first pressure sensor is used to detect the first pressure value in real time, convert the first pressure value into the first pressure signal, and send it to the hydraulic control device and the control module. The second pressure sensor is used to detect the second pressure value in real time, convert the second pressure value into the second pressure signal, and send it to the control module.

4. The hydraulic system with hydraulic compensation as described in claim 3, characterized in that, The hydraulic actuator includes: a hydraulic pump and a hydraulic cylinder; The hydraulic pump is connected to the hydraulic control device, and the hydraulic cylinder is connected to the hydraulic control device and the acquisition end of the second pressure sensor. The hydraulic pump is used to output pressure to the hydraulic cylinder according to the control of the hydraulic control device; The hydraulic cylinder is used to perform the preset pressure action according to the direction signal output by the hydraulic control device and the pressure.

5. The hydraulic system with hydraulic compensation as described in claim 4, characterized in that, The hydraulic control device includes: a pressure valve and a directional valve; The input end of the pressure valve is connected to the output end of the first pressure sensor and the hydraulic pump. The output end of the pressure valve is connected to the acquisition end of the first pressure sensor and the input end of the reversing valve. The input end of the reversing valve is also connected to the controller. The output end of the reversing valve is connected to the hydraulic cylinder. The pressure valve is used to control the pressure output by the hydraulic pump according to the pressure control signal and the first pressure signal, and to output the pressure to the reversing valve; The reversing valve is used to output the pressure to the hydraulic cylinder and control the direction of the preset pressure movement according to the pressure output signal and the direction signal.

6. The hydraulic system with hydraulic compensation as described in claim 5, characterized in that, The hydraulic system with hydraulic compensation also includes: a signal isolation device; The input terminal of the signal isolation device is connected to the output terminal of the first pressure sensor, the first output terminal of the signal isolation device is connected to the input terminal of the signal conversion device, and the second output terminal of the signal isolation device is connected to the input terminal of the pressure valve. The signal isolation device is used to send the first pressure signal to the pressure valve and the signal conversion device respectively.

7. The hydraulic system with hydraulic compensation as described in claim 6, characterized in that, The hydraulic system with hydraulic compensation includes: a plurality of second pressure sensors, a plurality of the reversing valves, and a plurality of the hydraulic cylinders; The number of the plurality of second pressure sensors, the plurality of the plurality of reversing valves and the plurality of hydraulic cylinders are the same; The acquisition ends of several second pressure sensors are respectively connected to several hydraulic cylinders, the output ends of several second pressure sensors are connected to the signal conversion device, the output ends of several directional valves are respectively connected to several hydraulic cylinders, and the input ends of several directional valves are connected to the controller and the hydraulic pump.

8. A gantry with hydraulic compensation, characterized in that, The hydraulically compensated gantry includes the hydraulically compensated hydraulic system as described in any one of claims 1 to 7.

9. The gantry with hydraulic compensation as described in claim 8, characterized in that, The hydraulic cylinder is located in the crossbeam above the gantry.

10. A hydraulic device with hydraulic compensation, characterized in that, The hydraulically compensated equipment includes the hydraulically compensated hydraulic system as described in any one of claims 1 to 7.

Images