An intelligent hydraulic press with equal stiffness for bidirectional loading

Abstract

The present invention discloses an equal-stiffness bidirectional loading intelligent hydraulic press, which includes a reaction structure frame. A vertical-axis pressurizing jack is fixed on the top surface of the reaction structure frame, and a left-side clamping jack of the horizontal axis and a right-side clamping jack of the horizontal axis are fixed on the left and right sides of the reaction frame respectively. The vertical-axis pressurizing jack is controlled by a variable-frequency speed-regulating direct-drive vertical-axis pressurizing pump and a control valve group. The clamping jacks on the left and right sides of the horizontal axis are controlled by two sets of independent variable-frequency speed-regulating direct-drive horizontal-axis clamping pumps and high-pressure switch control valve groups. The variable-frequency speed-regulating direct-drive horizontal-axis clamping pump and the control valve group are controlled by a first real-time controller, and the variable-frequency speed-regulating direct-drive vertical-axis pressurizing pump and the control valve group are controlled by a second real-time controller. The first real-time controller and the second real-time controller are connected to a PLC controller. Through the control of the first real-time controller and the second real-time controller, the clamping force of the horizontal axis will automatically increase or decrease in proportion synchronously with the applied pressure of the vertical axis.

Description

Technical Field

[0001] The present invention relates to an equal-stiffness bidirectional loading intelligent hydraulic press, belonging to the technical field of hydraulic mechanical equipment. Background Art

[0002] A hydraulic press is a machine that uses hydrostatic pressure to process products such as metals, plastics, rubbers, woods, powders, etc. It is commonly used in pressing processes and press-forming processes, such as forging, stamping, cold extrusion, straightening, bending, flanging, sheet metal drawing, powder metallurgy, press-fitting, and so on.

[0003] Currently, the mainstream hydraulic presses mainly focus on uniaxial compression and uniaxial tension. To improve the one-time forming of an object, in practical engineering applications, in most cases, the forming of an object usually requires biaxial synchronous compression, uniaxial compression, and lateral mechanical positioning, and cannot present a plane stress loading state, and the formed structural shape is incomplete. To improve the forming efficiency of an object and the structural stability after forming, existing bidirectional loading devices are all modified based on existing uniaxial hydraulic presses. Due to limited modification conditions, although the production efficiency of forming has been improved, these testing machines all have common drawbacks: relatively small stiffness and unequal bidirectional stiffness, so it is impossible to perform stable bidirectional equal-stiffness loading on the compressed object. Summary of the Invention

[0004] To overcome the above problems, the present invention proposes an equal-stiffness bidirectional loading intelligent hydraulic press, which realizes simultaneous perpendicular loading in two directions of an object component, a bidirectional equal-stiffness loading system, can perform separate or synchronous proportional loading in two orthogonal directions to a set maximum loading force value or displacement value, and can perform uniaxial or biaxial compression loading on a structural member; the two mutually perpendicular loading directions are controlled by a hydraulic servo through a control system, and can automatically adjust the loading speed and various loading combinations that can automatically adapt to the change of the bidirectional mutual force value. At the same time, the system integrates a hydraulic pump station and an electrical automatic control into an integrated structure.

[0005] To achieve the above object, the present invention is realized by the following technical solutions:

[0006] In a first aspect, an embodiment of the present invention provides an equal-stiffness bidirectional loading intelligent hydraulic press, which includes a reaction structure frame. A vertical-axis pressurizing jack is fixed on the top surface of the reaction structure frame, a left-side clamping jack of the horizontal axis is fixed on the left side of the reaction frame, and a right-side clamping jack of the horizontal axis is fixed on the right side of the reaction frame. The vertical-axis pressurizing jack is controlled by a variable-frequency speed-regulating direct-drive vertical-axis pressurizing pump and a control valve group. The left-side clamping jack of the horizontal axis and the right-side clamping jack of the horizontal axis are controlled by two sets of independent variable-frequency speed-regulating direct-drive horizontal-axis clamping pumps and high-pressure switch control valve groups. The variable-frequency speed-regulating direct-drive horizontal-axis clamping pumps and the high-pressure switch control valve group are controlled by a first real-time controller, and the variable-frequency speed-regulating direct-drive vertical-axis pressurizing pump and the control valve group are controlled by a second real-time controller. The first real-time controller and the second real-time controller are connected to a PLC controller, and the PLC controller communicates with an industrial control operation controller. Through the control of the first real-time controller and the second real-time controller, the horizontal-axis clamping force provided by the left-side clamping jack of the horizontal axis and the right-side clamping jack of the horizontal axis will automatically adapt to the vertical-axis pressing force output by the vertical-axis pressurizing jack and increase or decrease synchronously in proportion, enabling the object component to present a plane stress stress state and improving the structural stability after forming.

[0007] As a further technical solution, during the pressurization and load-holding pressure maintenance process of the vertical-axis pressurizing jack, the left-side clamping jack of the horizontal axis, and the right-side clamping jack of the horizontal axis on the object component, the changes in pressure and displacement are all adjusted in real time with low rotational speed through closed-loop control, without the need for full-flow operation throughout the process. In this way, unnecessary energy consumption will not be generated, the hydraulic oil in the system will not generate too high a temperature, greatly reducing energy consumption and extending the service life of the entire device.

[0008] As a further technical solution, multiple independent pressurizing jacks are provided on the vertical axis, meeting the forming pressurization requirements of object components with different sizes and shapes. At the same time, the hydraulic control systems of the multiple independent pressurizing jacks have a synchronous proportional loading characteristic, and can be programmed through real-time controllers, PLC controllers, and industrial control operation controllers to achieve preset stress and displacement curve loading for the pressurizing jacks.

[0009] As a further technical solution, multiple left-side clamping jacks of the horizontal axis and right-side clamping jacks of the horizontal axis are arranged along the horizontal axis, meeting the requirements for clamping and then pressurizing object components with different sizes and shapes. At the same time, their hydraulic control systems have a synchronous proportional loading characteristic, and can be programmed through real-time controllers, PLC controllers, and industrial control operation controllers to achieve preset stress and displacement curve loading for the left-side clamping jack of the horizontal axis and the right-side clamping jack of the horizontal axis.

[0010] As a further technical solution, a displacement sensor and a pressure sensor are installed on the vertical vertical-axis pressure jack. The signals of the displacement sensor and the pressure sensor are collected by a real-time controller and transmitted to a PLC controller, and form a closed-loop control with the pressure application command signal issued by the PLC controller to complete the real-time control of the deformation displacement and loading pressure of the vertical vertical-axis pressure jack on the object component.

[0011] As a further technical solution, in order to improve the signal stability and accuracy of the pressure sensor, a signal digital filter for the pressure sensor is installed in the real-time controller to eliminate the pressure pulsation and interference in the high-pressure pipeline and improve the stability and accuracy of pressure monitoring.

[0012] As a further technical solution, the variable-frequency speed-regulating direct-drive vertical vertical-axis pressure pump is driven by a variable-frequency speed-regulating controller to drive a variable-frequency motor. The motor shaft of the variable-frequency motor is directly connected to an ultra-high-pressure radial piston pump, and through the real-time controller, continuous flow changes (displacement changes) and pressure changes (loading pressure changes) of the pressure pump are realized.

[0013] As a further technical solution, the variable-frequency speed-regulating direct-drive horizontal-axis clamping pump is driven by a variable-frequency speed-regulating controller to drive a variable-frequency motor. The motor shaft of the variable-frequency motor is directly connected to an ultra-high-pressure radial piston pump, and through the real-time controller, continuous flow changes (displacement changes) and pressure changes (clamping pressure changes) of the clamping pump are realized.

[0014] As a further technical solution, displacement sensors and pressure sensors are also installed on the horizontal-axis clamping jack and the horizontal-axis clamping jack. The signals of the displacement sensors and the pressure sensors are collected by a real-time controller and transmitted to a PLC controller, and form a closed-loop control with the clamping command signal issued by the PLC controller to complete the real-time control of the deformation displacement and clamping pressure of the vertical vertical-axis pressure jack on the object component.

[0015] As a further technical solution, a spherical saddle is provided on each loading jack, so that the uneven force on the structural member caused by slight non-parallelism between the pressure application surfaces of the structural members can be eliminated.

[0016] As a further technical solution, the pressure sensors installed on the left horizontal-axis clamping jack and the right horizontal-axis clamping jack eliminate the pressure pulsation and interference in the high-pressure pipeline through the signal digital filter installed in the real-time controller, and improve the stability and accuracy of pressure monitoring.

[0017] The beneficial effects of the above embodiments of the present invention are as follows:

[0018] An equal-stiffness bidirectional loading intelligent hydraulic press proposed by the present invention realizes vertical loading in two directions of an object component. The bidirectional equal-stiffness loading system can perform separate or synchronous proportional loading to a set maximum loading value in two orthogonal directions, and can perform uniaxial or biaxial compression loading on structural components. The two mutually perpendicular loading directions are hydraulically servo-controlled by a control system, which can automatically adjust the loading speed and various loading combinations in two different directions to achieve linear and curved loading. At the same time, in the present invention, the variable-frequency speed-regulating direct-drive horizontal-axis clamping pump and the high-pressure switch control valve group are controlled by the first real-time controller, and the variable-frequency speed-regulating direct-drive vertical-axis pressurizing pump and the control valve group are controlled by the second real-time controller. By separately controlling the first real-time controller and the second real-time controller and combining their respective pressure sensors and displacement sensors, the horizontal-axis clamping force provided by the left clamping jack on the horizontal axis and the right clamping jack on the horizontal axis will automatically adapt to the vertical-axis pressurizing force output by the vertical-axis pressurizing jack on the vertical axis and increase or decrease synchronously in proportion, enabling the object component to present a plane stress stress state and improving the structural stability after forming. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is the main hydraulic principle view of an embodiment of the present invention;

[0020] Figure 2 is the left view of the combination of hydraulics and control of the present invention;

[0021] Figure 3 is the internal structure diagram of the variable-frequency speed-regulating direct-drive pump control system of the present invention.

[0022] In the figure: 1 - reaction structure frame, 2 - pressure sensor, 3 - vertical-axis pressurizing jack, 4 - displacement sensor, 5 - object component, 6 - left clamping jack on the horizontal axis, 7 - displacement sensor, 8 - pressure sensor, 9 - displacement sensor, 10 - left clamping jack on the horizontal axis, 11 - pressure sensor, 12 - high-pressure switch control valve group, 13 - variable-frequency speed-regulating direct-drive horizontal-axis clamping pump, 14 - variable-frequency speed-regulating direct-drive vertical-axis pressurizing pump, 141 - variable-frequency speed-regulating controller, 142 - drive variable-frequency motor, 143 - ultra-high-pressure radial piston pump, 15 - control valve group, 16 - real-time controller, 17 - digital filter, 18 - wireless data transmission interface, 19 - industrial control operation controller, 20 - PLC controller. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0023] It should be noted that the following detailed description is illustrative and is intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used in the present invention have the same meaning as commonly understood by those of ordinary skill in the technical field to which the present invention belongs.

[0024] It should be noted that the terms used herein are for the purpose of describing specific embodiments only and are not intended to limit the exemplary embodiments of the present invention. As used herein, unless the present invention clearly indicates otherwise, the singular forms are also intended to include the plural forms. In addition, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they specify the presence of features, steps, operations, devices, components, and / or combinations thereof;

[0025] As introduced in the background art, there are deficiencies in the prior art. To solve the above technical problems, the present invention proposes an equal-stiffness bidirectional loading intelligent hydraulic press.

[0026] In a typical embodiment of the present invention, as Figure 1 shown, an equal-stiffness bidirectional loading intelligent hydraulic press proposed in this embodiment includes a testing machine comprising a reaction structure frame 1, a vertical-axis pressurizing jack 3, a left-side clamping jack 6 for the horizontal axis, a right-side clamping jack 10 for the horizontal axis, a variable-frequency speed-regulating direct-drive vertical-axis pressurizing pump 14 and a control valve group 15, a variable-frequency speed-regulating direct-drive horizontal-axis clamping pump 13 and a high-pressure switch control valve group 12, a real-time controller 16, a PLC controller 20, an industrial control operation controller 19, and a wireless data transmission interface 18. At the same time, the intelligent hydraulic press integrates a hydraulic pump station and electrical automatic control. Among them, there are two real-time controllers 16, namely the first real-time controller and the second real-time controller.

[0027] The vertical-axis pressurizing jack 3 is fixed on the top surface of the reaction structure frame 1, the left-side clamping jack 6 for the horizontal axis is fixed on the left side of the reaction frame, and the right-side clamping jack 10 for the horizontal axis is fixed on the right side of the reaction frame. The vertical-axis pressurizing jack 3 is controlled by the variable-frequency speed-regulating direct-drive vertical-axis pressurizing pump 14 and the control valve group 15. The left-side clamping jack and the right-side clamping jack for the horizontal axis are controlled by two sets of independent variable-frequency speed-regulating direct-drive horizontal-axis clamping pumps 13 and high-pressure switch control valve groups 12. The variable-frequency speed-regulating direct-drive horizontal-axis clamping pump 13 and the high-pressure switch control valve group 12 are controlled by the first real-time controller, and the variable-frequency speed-regulating direct-drive vertical-axis pressurizing pump 14 and the control valve group 15 are controlled by the second real-time controller. The first real-time controller and the second real-time controller are connected to the PLC controller, and the PLC controller 20 communicates with the industrial control operation controller 19. Through the control of the first real-time controller and the second real-time controller, the horizontal-axis clamping force provided by the left-side clamping jack and the right-side clamping jack for the horizontal axis will automatically adapt to the vertical-axis pressing force output by the vertical-axis pressurizing jack and increase or decrease synchronously in proportion, enabling the object component to present a plane stress stress state and improving the structural stability after forming.

[0028] In this embodiment, the hydraulic control system adopted is a variable-frequency speed-regulating direct-drive pump control system. During the pressurization and load-holding pressure of the object component 5 by the vertical vertical-axis pressurizing jack 3, the left clamping jack 6 of the horizontal axis, and the right clamping jack 10 of the horizontal axis, the changes in pressure and displacement are both adjusted in small amounts at low speeds through closed-loop control, without the need for full-flow operation throughout the process. In this way, unnecessary energy losses will not occur, and the hydraulic oil in the system will not generate excessive temperatures, greatly reducing energy consumption and extending the service life of the entire equipment.

[0029] Furthermore, as Figure 2 shown, in this embodiment, 4 independent pressurizing jacks are provided on the vertical vertical axis, meeting the forming pressurization requirements of object components 5 of different sizes and shapes. At the same time, its hydraulic control system has a synchronous proportional loading characteristic. The 4 independent pressurizing jacks are respectively controlled by four variable-frequency speed-regulating direct-drive vertical vertical-axis pressurizing pumps 14 and control valve groups 15, that is, one pressurizing jack corresponds to one variable-frequency speed-regulating direct-drive vertical vertical-axis pressurizing pump 14 and control valve group 15. The four variable-frequency speed-regulating direct-drive vertical vertical-axis pressurizing pumps 14 and control valve groups 15 are all controlled by the first real-time controller. By programming the first real-time controller, the PLC controller 20, and the industrial control operation controller 19, preset pressure or displacement curve loading of the four pressurizing jacks is achieved.

[0030] Furthermore, in this embodiment, 4 independent clamping jacks are respectively provided on the left and right sides of the horizontal axis, meeting the requirements for pressurization after clamping of object components of different sizes and shapes. At the same time, its hydraulic control system has a synchronous proportional loading characteristic, and preset pressure or displacement curve loading of the clamping jack 6 can be achieved through programming of the real-time controller 16, the PLC controller 20, and the industrial control operation controller 19.

[0031] In this embodiment, there are 2 groups of variable-frequency speed-regulating direct-drive horizontal-axis clamping pumps 13 and high-pressure switch control valve groups 12. One group controls the left clamping jack 6 of the horizontal axis, and the other group controls the right clamping jack 10 of the horizontal axis; 4 clamping jacks are provided on each of the left and right sides of the horizontal axis. According to the clamping characteristics of the horizontal axis on the object component 5, the clamping jacks on each side are divided into two paths of equal displacement and equal pressure clamping, as Figure 2As shown in the figure, the four clamping jacks on the left side are divided into two groups (two in each group). The two groups of clamping jacks are controlled by a variable frequency speed regulation direct drive horizontal axis clamping pump 13 and two groups of high-pressure switch control valve groups 12. Therefore, the four clamping jacks on the left side of the horizontal axis are controlled by a variable frequency speed regulation direct drive horizontal axis clamping pump 13, and the four clamping jacks on the right side of the horizontal axis are controlled by another variable frequency speed regulation direct drive horizontal axis clamping pump 13. The PWM pulse width modulation command signals sent by the PLC controller 20 and the real-time controller 16 are used to control the two groups of high-pressure switch control valve groups 12 on each side, and the two groups of horizontal clamping jacks on each side are clamped and held. In this embodiment, there is a specific design in the arrangement of the horizontal axis clamping jacks, that is, to satisfy the locking and fixing of the unilateral horizontal axis clamping jacks, and the other side applies a tightening force to the object component 5 synchronously according to the vertical vertical pressure jacks. It can also satisfy the synchronous pushing and clamping of the object component 5 on both sides of the horizontal axis and automatically adapt to the synchronous force application following the vertical vertical pressure jacks.

[0032] Furthermore, in this embodiment, a displacement sensor 2 and a pressure sensor 4 are installed on the vertical vertical axis pressure jack 3. The signals of the displacement sensor 2 and the pressure sensor 4 are collected by the real-time controller 16 and transmitted to the PLC controller 20, and form a closed-loop control with the pressure command signal sent by the PLC controller 20 to complete the real-time control of the deformation displacement and loading pressure of the vertical vertical axis pressure jack on the object component 5.

[0033] Furthermore, in this embodiment, by independently controlling the vertical vertical axis pressure jack 3 and programming according to the industrial control operation controller 19, the driving of each group of vertical vertical axis pressure jacks 3 can be controlled, thereby meeting the pressurization requirements of various modes for the forming of object components 5 with different sizes and shapes (not limited to equal pressure and equal force pressurization and proportional curve pressurization here).

[0034] Since the equal stiffness bidirectional loading intelligent hydraulic press has relatively high requirements for the loading pressure and real-time performance of the vertical vertical axis pressure jack 3, which is an important index for the stability of the forming of the object component 5, the signal stability and accuracy of the pressure detection pressure sensor 4 of the vertical vertical axis pressure jack 3 are very crucial. In order to improve the signal stability and accuracy of the pressure sensor 4, a signal digital filter 17 of the pressure sensor 4 is installed in the real-time controller 16 to eliminate the pressure pulsation and interference in the high-pressure pipeline and improve the stability and accuracy of pressure monitoring.

[0035] Furthermore, the variable frequency speed regulation direct drive vertical vertical axis pressure pump 14 is driven by a variable frequency speed regulation controller 141 to drive a variable frequency motor 142. The motor shaft of the variable frequency motor 142 is directly connected to an ultra-high pressure radial piston pump 143, and through the real-time controller 16, continuous flow changes (displacement changes) and pressure changes (loading pressure changes) of the pressure pump are achieved.

[0036] Preferably, the variable-frequency motor 142 drives a vertical vertical-axis pressurizing pump, which can steplessly adjust the output oil volume and pressure. The vertical vertical-axis pressurizing pump is of the structure of an ultra-high-pressure radial piston pump 143, which is a valve-distributed piston pump with an output efficiency of over 0.98. It can meet the requirement that the variable-frequency motor 142 drives the ultra-high-pressure radial piston pump 143 at a low speed to also achieve high-efficiency and accurate oil volume, thereby realizing the functions of high-precision displacement or force loading.

[0037] Furthermore, there are 4 groups of variable-frequency speed-regulating direct-drive vertical vertical-axis pressurizing pumps 14 in the system disclosed in this embodiment. Each group independently controls a vertical vertical-axis pressurizing jack 3 and is programmed according to the industrial control operation controller 19 to drive and control each vertical vertical-axis pressurizing jack 3, so as to meet the pressurizing requirements of various modes for forming object components 5 of different sizes and shapes (here it is not limited to equal-pressure and equal-force pressurization and proportional curve pressurization).

[0038] In this embodiment, the variable-frequency speed-regulating direct-drive horizontal-axis clamping pump 13 is also driven by a variable-frequency speed-regulating controller to drive a variable-frequency motor. The motor shaft of the variable-frequency motor is directly connected to the ultra-high-pressure radial piston pump 143. Through the real-time controller 16, continuous flow changes (displacement changes) and pressure changes (clamping pressure changes) of the clamping pump are realized.

[0039] In this embodiment, a displacement sensor 7 and a pressure sensor 8 are also installed on the left-side clamping jack 6 of the horizontal axis; a displacement sensor 9 and a pressure sensor 11 are also installed on the right-side clamping jack 10 of the horizontal axis. The signals of each displacement sensor and pressure sensor are collected by the real-time controller and transmitted to the PLC controller 20, and form a closed-loop control with the clamping command signal issued by the PLC controller 20 to complete the real-time control of the deformation displacement and clamping pressure of the vertical vertical-axis pressurizing jack for clamping the object component 5.

[0040] In this embodiment, the pressure sensors 8 and 11 installed on the left-side clamping jack 6 and the right-side clamping jack 10 of the horizontal axis also eliminate the pressure pulsation and interference in the high-pressure pipeline through the signal digital filter 17 installed in the real-time controller 16, improving the stability and accuracy of pressure monitoring.

[0041] The control method of the electrical control system of the medium-stiffness bidirectional loading intelligent hydraulic press in this embodiment is as follows: The industrial control operation controller 19 installed in the system issues a horizontal axis pre-clamping pressure control instruction, and controls the variable frequency speed regulation controller through the outputs of the PLC controller 20 and the real-time controller 16, driving the variable frequency speed regulation direct-drive horizontal axis clamping pump 13, which forms a force closed-loop control with the pressure sensors installed on the clamping jacks on the left side and the right side of the horizontal axis. The pressure control adjustment is carried out by adjusting the rotational speed of the variable frequency motor on the variable frequency speed regulation direct-drive horizontal axis clamping pump 13.

[0042] After the pre-clamping is in place, the industrial control operation controller 19 issues a pressure control instruction for pre-pressing the vertical axis pressurizing jack 3, and controls the variable frequency speed regulation controller 141 through the outputs of the PLC controller 20 and the real-time controller 16, driving the direct-drive vertical axis pressurizing pump, which forms a force closed-loop control with the pressure sensor installed on the vertical axis pressurizing jack 3. The pressure control adjustment is carried out by adjusting the rotational speed of the variable frequency motor 142.

[0043] After the pre-pressing of the vertical axis pressurizing jack 3 is completed, the industrial control operation controller 19 operates the pressurizing process according to the forming pressurizing characteristics of the object component 5 preset by the user. Through the outputs of the PLC controller 20 and the real-time controller 16, it controls the variable frequency speed regulation direct-drive vertical axis pressurizing pump 14 and the control valve group 15, the variable frequency speed regulation direct-drive horizontal axis clamping pump 13 and the high-pressure switch control valve group 12, driving the vertical axis pressurizing jack 3, the horizontal axis clamping jack 6, and the horizontal axis clamping jack 10 to perform a predetermined attitude synchronous control, realizing the full-automatic control of the entire process of pressing and forming the object component 5.

[0044] Further, an operational amplifier and an integral arithmetic unit are provided in the above-mentioned real-time controller 16. The signal data of the displacement sensor and the pressure sensor are collected in the operation center in real time, and are operated with the displacement instruction and the pressure instruction issued by the PLC controller 20. After being processed by the amplifier and the integral arithmetic unit, they are output to the corresponding variable frequency speed regulation controller, thereby controlling the variable frequency speed regulation direct-drive vertical axis pressurizing pump 14 and the variable frequency speed regulation direct-drive horizontal axis clamping pump 13 to supply oil to the vertical axis pressurizing jack and the horizontal axis clamping jack. The operational amplifier also generates a PWM pulse width control circuit, thereby controlling the high-pressure switch control valve group 12 to control the horizontal axis clamping jack. The specific working principle is described in the attached drawings.

[0045] Further, the above-mentioned wireless data transmission interface 18 is installed inside the electrical control box, and transmits the vertical vertical pressing force, displacement, horizontal axis clamping force, displacement and all parameters of the intelligent hydraulic press collected by the real-time controller 16 to the computer client or mobile phone client of the operating user in real time through the wireless WIFI-4G network, so as to meet the real-time monitoring of the operating process of the equal stiffness bidirectional loading intelligent hydraulic press by the user.

[0046] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. An equal-stiffness bidirectional loading intelligent hydraulic press, characterized in that, It includes a reaction force structure frame, on the top surface of which a vertical axis pressure jack is fixed. On the left side of the reaction frame, a horizontal axis left clamping jack is fixed, and on the right side of the reaction frame, a horizontal axis right clamping jack is fixed. The vertical axis pressure jack is controlled by a variable frequency speed regulation direct drive vertical axis pressure pump and a control valve group. The horizontal axis left clamping jack and the horizontal axis right clamping jack are controlled by two sets of independent variable frequency speed regulation direct drive horizontal axis clamping pumps and high-pressure switch control valve groups. The variable frequency speed regulation direct drive horizontal axis clamping pumps and the high-pressure switch control valve groups are controlled by a first real-time controller, and the variable frequency speed regulation direct drive vertical axis pressure pump and the control valve group are controlled by a second real-time controller. The first real-time controller and the second real-time controller are connected to a PLC controller, and the PLC controller communicates with an industrial control operation controller. Through the control of the first real-time controller and the second real-time controller, the horizontal axis clamping force provided by the horizontal axis left clamping jack and the horizontal axis right clamping jack will automatically increase or decrease in synchronization with the vertical axis pressure of the vertical axis pressure jack output in proportion.

2. The equal-stiffness bi-directional loading intelligent hydraulic press according to claim 1, wherein During the pressurization and load-bearing pressure maintenance process of the object component by the vertical axis pressure jack, the horizontal axis left clamping jack, and the horizontal axis right clamping jack, the changes in pressure and displacement are all adjusted in real time with low revolutions in a micro amount through closed-loop control.

3. The equal-stiffness bidirectional loading intelligent hydraulic press according to claim 1, wherein, Multiple vertical axis pressure jacks are provided. The multiple independent vertical axis pressure jacks are synchronously loaded by a variable frequency speed regulation direct drive vertical axis pressure pump and a control valve group in a certain proportion of pressure and displacement mode to achieve preset stress and displacement curve loading for the vertical axis pressure jacks.

4. The equal-stiffness bi-directional loading intelligent hydraulic press according to claim 1, characterized in that, Multiple horizontal axis left clamping jacks and multiple horizontal axis right clamping jacks are provided respectively. The multiple independent horizontal axis left clamping jacks and horizontal axis right clamping jacks are controlled by a variable frequency speed regulation direct drive horizontal axis clamping pump and a high-pressure switch control valve group to be synchronously loaded in a certain proportion of pressure and displacement mode to achieve preset stress and displacement curve loading for the horizontal axis left clamping jacks and the horizontal axis right clamping jacks.

5. The equal-stiffness bidirectional loading intelligent hydraulic press according to claim 1, characterized in that, A displacement sensor and a pressure sensor are installed on the vertical axis pressure jack. The signals of the displacement sensor and the pressure sensor are collected by the first real-time controller and transmitted to the PLC controller, and form a closed-loop control with the pressurization command signal issued by the PLC controller to complete real-time control of the deformation displacement and loading pressure of the vertical axis pressure jack on the object component. A signal digital filter of the pressure sensor is installed in the first real-time controller to improve the stability and accuracy of pressure monitoring.

6. The equal-stiffness bidirectional loading intelligent hydraulic press according to claim 1, wherein, The variable frequency speed regulation direct drive vertical axis pressure pump is driven by a variable frequency speed regulation controller to drive a variable frequency motor. The motor shaft of the variable frequency motor is directly connected to an ultra-high pressure radial piston pump, and through the first real-time controller, continuous flow change and pressure change of the pressure pump are achieved.

7. The equal-stiffness bidirectional loading intelligent hydraulic press according to claim 1, characterized in that, The described variable-frequency speed-regulating direct-drive horizontal-axis clamping pump is driven by a variable-frequency speed-regulating controller to drive a variable-frequency motor. The motor shaft of the variable-frequency motor is directly connected to an ultra-high-pressure radial piston pump. Through a second real-time controller, continuous flow rate changes and pressure changes of the clamping pump are achieved.

8. The equal-stiffness bidirectional loading intelligent hydraulic press according to claim 1, wherein Displacement sensors and pressure sensors are installed on both the left clamping jack of the horizontal axis and the right clamping jack of the horizontal axis. Signals from the displacement sensors and pressure sensors are collected through a real-time controller and transmitted to a PLC controller, forming a closed-loop control with the clamping command signal issued by the PLC controller to complete real-time control of the deformation displacement and clamping pressure of the vertical vertical-axis pressurizing jack for clamping an object component.

9. The equal-stiffness bidirectional loading intelligent hydraulic press according to claim 1, wherein, A spherical deviation-correcting saddle is provided on each jack to achieve automatic deviation-correcting adjustment of the unevenness of the force-receiving surface and the reaction surface.

10. The equal-stiffness bidirectional loading intelligent hydraulic press according to claim 1, characterized in that, The pressure sensors installed on the left clamping jack of the horizontal axis and the right clamping jack of the horizontal axis eliminate pressure pulsation and interference in the high-pressure pipeline through a signal digital filter installed in the real-time controller, improving the stability and accuracy of pressure monitoring.

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