A deviation rectifying system of a hydraulic machine and the hydraulic machine

Abstract

The application provides a deviation rectifying system of a hydraulic machine and the hydraulic machine, and relates to the technical field of the hydraulic machine.The deviation rectifying system of the hydraulic machine comprises a first return cylinder, a second return cylinder, a first electromagnetic valve, a first control valve group, a second electromagnetic valve and a second control valve group.The first electromagnetic valve is connected with the first return cylinder and a main working pump respectively.The second electromagnetic valve is connected with the second return cylinder and the main working pump respectively.The first end of the first control valve group is connected with the oil port of the first return cylinder.The second end of the first control valve group is used for being connected with the oil tank of the hydraulic machine.The third end of the first control valve group is used for being connected with the deviation rectifying oil pump of the hydraulic machine.The first end of the second control valve group is connected with the oil port of the second return cylinder.The second end of the second control valve group is used for being connected with the oil tank.The third end of the second control valve group is used for being connected with the deviation rectifying oil pump.The fourth end of the first control valve group is connected with the fourth end of the second control valve group.The application can improve the machining precision of the hydraulic machine.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of hydraulic machines, in particular to a deviation rectifying system of a hydraulic machine and the hydraulic machine. BACKGROUND

[0002] A hydraulic machine is a device that uses hydraulic transmission principle to realize mechanical energy conversion, and is widely used in industrial manufacturing, metal forming, plastic processing and building fields. Due to its high efficiency, flexible operation and other advantages, the hydraulic machine plays an increasingly important role in modern production.

[0003] However, in the working process of the hydraulic machine, due to the deviation of the workpiece placement position or the abnormality of the system pressure, the movable cross beam may be unbalanced in force during the movement, resulting in deviation of the movable cross beam, thereby affecting the machining precision of the hydraulic machine. SUMMARY

[0004] The problem solved by the present application is how to improve the machining precision of the hydraulic machine.

[0005] To solve the above problems, the present application provides a deviation rectifying system of a hydraulic machine and the hydraulic machine.

[0006] In a first aspect, the present application provides a deviation rectifying system of a hydraulic machine, comprising a first return cylinder, a second return cylinder, a first electromagnetic valve, a first control valve group, a second electromagnetic valve and a second control valve group, the movable end of the first return cylinder and the movable end of the second return cylinder are respectively used for connecting with the movable cross beam of the hydraulic machine, and the first return cylinder and the second return cylinder are symmetrically arranged below the movable cross beam along the center line of symmetry of the movable cross beam, one end of the first electromagnetic valve is connected with the oil port of the first return cylinder, the other end of the first electromagnetic valve is used for connecting with the main working pump of the hydraulic machine, one end of the second electromagnetic valve is connected with the oil port of the second return cylinder, the other end of the second electromagnetic valve is used for connecting with the main working pump, the first end of the first control valve group is connected with the oil port of the first return cylinder, the second end of the first control valve group is used for connecting with the oil tank of the hydraulic machine, the third end of the first control valve group is used for connecting with the deviation rectifying oil pump of the hydraulic machine, the first end of the second control valve group is connected with the oil port of the second return cylinder, the second end of the second control valve group is used for connecting with the oil tank, the third end of the second control valve group is used for connecting with the deviation rectifying oil pump, and the fourth end of the first control valve group is connected with the fourth end of the second control valve group.

[0007] Optionally, the first control valve group comprises a first proportional flow valve, a first proportional servo valve and a third electromagnetic valve, one end of the first proportional flow valve is connected with the oil port of the first return cylinder, the other end of the first proportional flow valve is used for being connected with the oil tank, the first end of the first proportional servo valve is connected with the oil port of the first return cylinder, the second end of the first proportional servo valve is used for being connected with the oil tank, the third end of the first proportional servo valve is used for being connected with the deviation correcting oil pump, one end of the third electromagnetic valve is connected with the oil port of the first return cylinder, the other end of the third electromagnetic valve is connected with the fourth end of the second control valve group.

[0008] Optionally, the second control valve group comprises a second proportional flow valve, a second proportional servo valve and a fourth electromagnetic valve, one end of the second proportional flow valve is connected with the oil port of the second return cylinder, the other end of the second proportional flow valve is used for being connected with the oil tank, the first end of the second proportional servo valve is connected with the oil port of the second return cylinder, the second end of the second proportional servo valve is used for being connected with the oil tank, the third end of the second proportional servo valve is used for being connected with the deviation correcting oil pump, one end of the fourth electromagnetic valve is connected with the oil port of the second return cylinder, the other end of the fourth electromagnetic valve is connected with the other end of the third electromagnetic valve.

[0009] Optionally, the system further comprises a first pressure sensor and a second pressure sensor, the first pressure sensor is arranged at the oil port of the first return cylinder, and the second pressure sensor is arranged at the oil port of the second return cylinder.

[0010] Optionally, the system further comprises a third return cylinder, a fourth return cylinder, a fifth electromagnetic valve, a sixth electromagnetic valve, a third control valve group and a fourth control valve group, one end of the fifth electromagnetic valve is connected with the oil port of the third return cylinder, the other end of the fifth electromagnetic valve is used for being connected with the main working pump, one end of the sixth electromagnetic valve is connected with the oil port of the fourth return cylinder, the other end of the sixth electromagnetic valve is used for being connected with the main working pump, the first end of the third control valve group is connected with the oil port of the third return cylinder, the second end of the third control valve group is used for being connected with the oil tank, the third end of the third control valve group is used for being connected with the deviation correcting oil pump, the first end of the fourth control valve group is connected with the oil port of the fourth return cylinder, the second end of the fourth control valve group is used for being connected with the oil tank, the third end of the fourth control valve group is used for being connected with the deviation correcting oil pump, and the fourth end of the fourth control valve group is connected with the fourth end of the first control valve group, the fourth end of the second control valve group and the fourth end of the third control valve group respectively.

[0011] Optionally, the third control valve group comprises a third proportional flow valve, a third proportional servo valve and a seventh electromagnetic valve, one end of the third proportional flow valve is connected with the oil port of the third return cylinder, the other end of the third proportional flow valve is used for being connected with the oil tank, the first end of the third proportional servo valve is connected with the oil port of the third return cylinder, the second end of the third proportional servo valve is used for being connected with the oil tank, the third end of the third proportional servo valve is used for being connected with the deviation correcting oil pump, one end of the seventh electromagnetic valve is connected with the oil port of the third return cylinder, the other end of the seventh electromagnetic valve is connected with the fourth end of the first control valve group, the second control valve group and the fourth control valve group respectively.

[0012] Optionally, the fourth control valve group comprises a fourth proportional flow valve, a fourth proportional servo valve and an eighth electromagnetic valve, one end of the fourth proportional flow valve is connected with the oil port of the fourth return cylinder, the other end of the fourth proportional flow valve is used for being connected with the oil tank, the first end of the fourth proportional servo valve is connected with the oil port of the fourth return cylinder, the second end of the fourth proportional servo valve is used for being connected with the oil tank, the third end of the fourth proportional servo valve is used for being connected with the deviation correcting oil pump, one end of the eighth electromagnetic valve is connected with the oil port of the fourth return cylinder, the other end of the eighth electromagnetic valve is connected with the fourth end of the first control valve group and the second control valve group and the other end of the seventh electromagnetic valve.

[0013] Optionally, the system further comprises a third pressure sensor and a fourth pressure sensor, the third pressure sensor is arranged at the oil port of the third return cylinder, and the fourth pressure sensor is arranged at the oil port of the fourth return cylinder.

[0014] Optionally, the system further comprises an energy accumulator, and an oil port of the energy accumulator is used for being connected with the deviation correcting oil pump.

[0015] In the second aspect, the present application provides a hydraulic machine comprising the deviation correcting system of the hydraulic machine according to the first aspect.

[0016] The hydraulic machine deviation rectifying system and the hydraulic machine have the beneficial effects that the first return cylinder and the second return cylinder are connected with the main working pump by the corresponding first electromagnetic valve and the second electromagnetic valve respectively, the first electromagnetic valve and the second electromagnetic valve control the main working pump to deliver the hydraulic oil to the first return cylinder and the second return cylinder respectively, the action speed and the start and stop time of the first return cylinder and the second return cylinder can be adjusted by the cooperative control of the first electromagnetic valve and the second electromagnetic valve, and the flexibility and adaptability of the control of the return cylinder are improved. The first return cylinder and the second return cylinder are cooperatively controlled by the first control valve group and the second control valve group, that is, the first end of the first control valve group is connected with the oil port of the first return cylinder, the second end is connected with the oil tank, and the third end is connected with the deviation rectifying pump, and then the hydraulic oil of the oil tank is introduced into the return cylinder, so that the oil pressure in the return cylinder is increased, and the return cylinder can push and level the movable cross beam. The second ends of the first control valve group and the second control valve group are directly connected with the oil tank respectively, the first return cylinder and the second return cylinder can be controlled to discharge and depressurize, when the movable cross beam deviates during the descending process, the pressure in the first return cylinder and the second return cylinder needs to be cooperatively adjusted, the return cylinder at the higher end of the movable cross beam is discharged and depressurized, the corresponding end of the movable cross beam falls, so that the movable cross beam remains horizontal during the falling process. Through the cooperative matching of the first electromagnetic valve, the second electromagnetic valve, the first control valve group and the second control valve group, the positions in the first return cylinder and the second return cylinder can be dynamically adjusted during the working process of the hydraulic machine, the two return cylinders act cooperatively, when the movable cross beam deviates, the movable cross beam can be quickly rectified and adjusted, so that the movable cross beam remains in the horizontal state during the movement process, the pressure acts uniformly and vertically on the workpiece, the local deformation of the workpiece is avoided, the finished product shape is regular and closely attached under the processes of stamping and laminating, and the machining precision of the hydraulic machine on the workpiece is improved. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 FIG. 1 is a structural schematic diagram of a hydraulic machine deviation rectifying system according to an embodiment of the present application;

[0018] Figure 2 FIG. 2 is a sectional view of the hydraulic machine deviation rectifying system according to the embodiment of the present application; Figure 1 FIG. 3 is a sectional view of A in FIG. 2;

[0019] Figure 3 FIG. 4 is a structural schematic diagram of two return cylinders according to the embodiment of the present application;

[0020] Figure 4 FIG. 5 is a structural schematic diagram of four return cylinders according to the embodiment of the present application.

[0021] BRIEF DESCRIPTION OF DRAWINGS

[0022] A1 - first solenoid valve; A2 - second solenoid valve; A3 - third solenoid valve; A4 - fourth solenoid valve; A5 - fifth solenoid valve; A6 - sixth solenoid valve; A7 - seventh solenoid valve; A8 - eighth solenoid valve; B1 - first proportional flow valve; B2 - second proportional flow valve; B3 - third proportional flow valve; B4 - fourth proportional flow valve; C1 - first proportional servo valve; C2 - second proportional servo valve; C3 - third proportional servo valve; C4 - fourth proportional servo valve; D1 - first return cylinder; D2 - second return cylinder; D3 - third return cylinder; D4 - fourth return cylinder; F - main working pump; G - deviation correction oil pump; H - accumulator; P - oil tank; L - movable cross beam. DETAILED DESCRIPTION

[0023] In order to make the above objectives, features and advantages of the present application more clear and comprehensible, specific embodiments of the present application will be described in detail below with reference to the accompanying drawings. Although some embodiments of the present application are shown in the drawings, it should be understood that the present application can be implemented in various forms, and should not be interpreted as being limited to the embodiments set forth herein, but rather, these embodiments are provided so as to make the present application more thorough and complete. It should be understood that the drawings and embodiments of the present application are for exemplary purposes only, and are not intended to limit the scope of protection of the present application.

[0024] It should be understood that each of the steps recited in the method embodiments of the present application can be executed in different orders, and / or in parallel. In addition, the method embodiments can include additional steps and / or omit the execution of the steps shown. The scope of the present application is not limited in this respect.

[0025] The term "comprising" and variations thereof as used herein are open-ended, that is "including, but not limited to"; the term "based on" is "based, at least in part, on"; the term "one embodiment" means "at least one embodiment"; the term "another embodiment" means "at least one additional embodiment"; the term "some embodiments" means "at least some embodiments"; the term "optional" means "optional in at least some embodiments". Related definitions are given throughout the detailed description. It should be noted that the concepts mentioned in the present application are merely used for distinguishing different devices, modules or units, and are not intended to limit the functions of the devices, modules or units.

[0026] It should be noted that the terms "one", "multiple", "a number of" mentioned in the present application are illustrative rather than restrictive, and those skilled in the art should understand that, unless otherwise explicitly stated in the context, it should be understood as "one or more".

[0027] Names of messages or information exchanged between multiple devices in the embodiments of the present application are only for illustrative purposes, and are not used to limit the scope of the messages or information.

[0028] In the related art, when the hydraulic machine is working, the force imbalance of the movable cross beam may occur due to the influence of factors such as cylinder imbalance, hydraulic oil performance fluctuation, or eccentric placement of the workpiece, thereby affecting the machining precision of the hydraulic machine. For example, when the plate is punched by using the hydraulic machine, the movable cross beam with deflection drives the upper die to press down, the die cannot simultaneously contact the workpiece flat, one side contacts the workpiece first, and a large pressure is concentrated instantaneously, so that the part of the material starts to deform first; the other side contacts the workpiece later, and the pressure duration and degree of each part of the workpiece are greatly different, so that the thickness of the punched plate is uneven, and wrinkles and tears may occur at the edge, which seriously affects the appearance and quality of the product.

[0029] In view of the problems in the related art, the present embodiment provides a deviation correction system of a hydraulic machine and the hydraulic machine.

[0030] As shown in Figure 1 and 2 , the deviation correction system of the hydraulic machine provided by the present embodiment comprises a first return cylinder D1, a second return cylinder D2, a first electromagnetic valve A1, a first control valve group, a second electromagnetic valve A2, and a second control valve group, the movable end of the first return cylinder D1 and the movable end of the second return cylinder D2 are respectively used to be connected with a movable cross beam L of a hydraulic machine, and the first return cylinder D1 and the second return cylinder D2 are symmetrically arranged below the movable cross beam L along the center line of symmetry of the movable cross beam L, one end of the first electromagnetic valve A1 is connected with an oil port of the first return cylinder D1, the other end of the first electromagnetic valve A1 is used to be connected with a main working pump F of the hydraulic machine, one end of the second electromagnetic valve A2 is connected with an oil port of the second return cylinder D2, the other end of the second electromagnetic valve A2 is used to be connected with the main working pump F, a first end of the first control valve group is connected with the oil port of the first return cylinder D1, a second end of the first control valve group is used to be connected with a tank P of the hydraulic machine, a third end of the first control valve group is used to be connected with a deviation correction oil pump G of the hydraulic machine, a first end of the second control valve group is connected with the oil port of the second return cylinder D2, a second end of the second control valve group is used to be connected with the tank P, a third end of the second control valve group is used to be connected with the deviation correction oil pump G, and a fourth end of the first control valve group is connected with a fourth end of the second control valve group.

[0031] Specifically, as shown in Figure 3As shown, when two return cylinders are provided in the hydraulic machine, the first return cylinder D1 and the second return cylinder D2 are arranged at opposite corners of the movable cross beam L, and the movable ends of the first return cylinder D1 and the second return cylinder D2 are connected to the lower ends of the movable cross beam L. The box contains three working cylinders, each return cylinder is provided with a displacement sensor, which is built-in or external to the hydraulic cylinder, or the displacement sensor is installed on two symmetrical corners of the movable cross beam L to detect the displacement of the symmetrical corners of the movable cross beam L. One end of the first electromagnetic valve A1 is connected to the oil port of the first return cylinder D1, which is the oil inlet and outlet port of the first return cylinder D1. The other end of the first electromagnetic valve A1 is connected to the main working pump F, and the other end of the main working pump F is connected to the oil tank P. When it is necessary to deliver hydraulic oil to the first return cylinder D1, the hydraulic oil in the oil tank P can be pumped out through the main working pump F, and then flow into the first return cylinder D1 from the oil port of the first return cylinder D1 after passing through the first electromagnetic valve A1. The first electromagnetic valve A1 is used to control the opening and closing of the oil path between the main working pump F and the first return cylinder D1. Similarly, one end of the second electromagnetic valve A2 is connected to the oil port of the second return cylinder D2, and the other end of the second electromagnetic valve A2 is also connected to the main working pump F. When the second return cylinder D2 needs to deliver hydraulic oil, the second return cylinder D2 can be delivered with hydraulic oil through the main working pump F. The second electromagnetic valve A2 is used to control the opening and closing of the oil path between the main working pump F and the second hydraulic cylinder. In order to correct the deviation of the movable cross beam L of the hydraulic machine, first control valve group and second control valve group are added in the oil path of the first return cylinder D1 and the second return cylinder D2. The first end of the first control valve group is connected to the oil port of the first return cylinder D1, and the second end of the first control valve group is directly connected to the oil tank P of the hydraulic machine. When the first return cylinder D1 needs to discharge hydraulic oil for pressure relief, the discharged hydraulic oil can be introduced into the oil tank P through the second end of the first control valve group. The third end of the first control valve group is connected to the correction oil pump G. When the first return cylinder D1 needs to input hydraulic oil, the correction oil pump G can be used to deliver hydraulic oil to it, that is, the oil outlet of the correction oil pump G is connected to the third end of the first control valve group, and the oil inlet of the correction oil pump G is connected to the oil tank P. The fourth end of the first control valve group is in communication with the fourth end of the second control valve group. When there is a pressure difference between the hydraulic oil in the first return cylinder D1 and the second return cylinder D2, the pressure in them can be balanced through the connected port, so that the first return cylinder D1 and the second return cylinder D2 can push the movable cross beam L to be in a horizontal state. Similarly, the first end of the second control valve group is connected to the oil port of the second return cylinder D2, the second end of the second control valve group is connected to the oil tank P, and the third end of the second control valve group is connected to the correction oil pump G.

[0032] In this embodiment, the first return cylinder D1 and the second return cylinder D2 are connected to the main working pump F by corresponding first electromagnetic valve A1 and second electromagnetic valve A2, respectively. The first electromagnetic valve A1 and the second electromagnetic valve A2 control the delivery of hydraulic oil to the first return cylinder D1 and the second return cylinder D2, respectively. The first electromagnetic valve A1 and the second electromagnetic valve A2 can be cooperatively controlled to adjust the action speed and start-stop time of the first return cylinder D1 and the second return cylinder D2, thereby improving the flexibility and adaptability of the return cylinder control. The first control valve group and the second control valve group cooperatively control the first return cylinder D1 and the second return cylinder D2, i.e., the first end of the first control valve group is connected to the oil port of the first return cylinder D1, the second end is connected to the oil tank P, and the third end is connected to the correction pump G. Then, the hydraulic oil in the oil tank P is introduced into the return cylinder, increasing the oil pressure of the return cylinder, so that the return cylinder can push and level the movable cross beam L. The second ends of the first control valve group and the second control valve group are directly connected to the oil tank P, which can control the first return cylinder D1 and the second return cylinder D2 to discharge oil and relieve pressure. When the movable cross beam L deviates during the lowering process, the pressure in the first return cylinder D1 and the second return cylinder D2 needs to be cooperatively adjusted, the return cylinder at the higher end of the movable cross beam L is discharged to relieve pressure, and the corresponding end of the movable cross beam L falls, thereby keeping the movable cross beam L horizontal during the falling process. Through the cooperative action of the first electromagnetic valve A1, the second electromagnetic valve A2, the first control valve group and the second control valve group, the positions of the first return cylinder D1 and the second return cylinder D2 can be dynamically adjusted during the operation of the hydraulic machine, so that the two return cylinders act cooperatively. When the movable cross beam L deviates, it can be quickly corrected and adjusted to keep the movable cross beam L horizontal during movement, so that the pressure acts uniformly and vertically on the workpiece, avoiding local deformation of the workpiece, ensuring that the finished product is regular and closely fitted under stamping, laminating and other processes, thereby improving the machining accuracy of the hydraulic machine for the workpiece.

[0033] Optionally, as shown in Figure 1 and 2 , the first control valve group includes a first proportional flow valve B1, a first proportional servo valve C1 and a third electromagnetic valve A3. One end of the first proportional flow valve B1 is connected to the oil port of the first return cylinder D1, and the other end of the first proportional flow valve B1 is used to connect to the oil tank P. The first end of the first proportional servo valve C1 is connected to the oil port of the first return cylinder D1, the second end of the first proportional servo valve C1 is used to connect to the oil tank P, and the third end of the first proportional servo valve C1 is used to connect to the correction oil pump G. One end of the third electromagnetic valve A3 is connected to the oil port of the first return cylinder, and the other end of the third electromagnetic valve A3 is connected to the fourth end of the second control valve group.

[0034] Optionally, the second control valve group comprises a second proportional flow valve B2, a second proportional servo valve C2 and a fourth electromagnetic valve A4, one end of the second proportional flow valve B2 is connected with the oil port of the second return cylinder D2, the other end of the second proportional flow valve B2 is used to be connected with the oil tank P, the first end of the second proportional servo valve C2 is connected with the oil port of the second return cylinder D2, the second end of the second proportional servo valve C2 is used to be connected with the oil tank P, the third end of the second proportional servo valve C2 is used to be connected with the deviation oil pump G, one end of the fourth electromagnetic valve A4 is connected with the oil port of the second return cylinder, the other end of the fourth electromagnetic valve A4 is connected with the other end of the third electromagnetic valve A3.

[0035] Specifically, one end of the first proportional flow valve B1 can be connected with the first return cylinder D1 as the first end of the first control valve group, the other end of the first proportional flow valve B1 can be connected with the oil tank P as the second end of the first control valve group, that is, the first return cylinder D1 and the oil tank P are communicated through the first proportional flow valve B1, so that the discharge of the first return cylinder D1 is regulated and discharged through the first proportional flow valve B1. The first end of the first proportional servo valve C1 can also be connected with the first return cylinder D1 as the first end of the first control valve group, the second end of the first proportional servo valve C1 can be connected with the oil tank P as the second end of the first control valve group, and the third end of the first proportional servo valve C1 can also be connected with the deviation oil pump G as the third end of the first control valve group, that is, the first return cylinder D1 is connected with the oil tank P and the deviation oil pump G through the first proportional servo valve C1, so that the input and output of the first return cylinder D1 can be controlled through the first proportional servo valve C1, realizing the position closed loop of the servo valve and the displacement sensor. One end of the third electromagnetic valve A3 can also be connected with the first return cylinder D1 as the first end of the first control valve group, the other end of the third electromagnetic valve A3 can be connected with the fourth end of the second control valve group as the fourth end of the first control valve group, that is, the first return cylinder D1 is connected with the fourth end of the second control valve group through the third electromagnetic valve A3, that is, the movable cross beam L communicates the first return cylinder D1 and the second return cylinder D2 during the process of lowering and lifting in the idle stroke.

[0036] Similarly, the second return cylinder D2 and the oil tank P are communicated through the second proportional flow valve B2, so that the discharge pressure relief of the second return cylinder D2 is regulated through the second proportional flow valve B2. The second return cylinder D2 is connected with the oil tank P and the correction oil pump G through the second proportional servo valve C2, so that the input and output of the second return cylinder D2 can be controlled through the second proportional servo valve C2, realizing the position closed loop of the servo valve and the displacement sensor. The other end of the fourth electromagnetic valve A4 and the other end of the third electromagnetic valve A3 are connected, so that the oil ports of the first return cylinder D1 and the second return cylinder D2 can be communicated through the third electromagnetic valve A3 and the fourth electromagnetic valve A4 during the process of the movable cross beam L descending and lifting in the idle stroke.

[0037] Exemplarily, the forging process of the hydraulic machine needs to press and deform the workpiece to the required size. When the hydraulic machine works, the accurate position information of the movable cross beam L can be obtained through the detection result of the displacement sensor. When the movable cross beam L contacts the workpiece or is a certain distance away from the workpiece in the idle stroke, it is determined that the idle stroke ends, the main cylinder starts to pressurize, enters the forging stage, and the movable cross beam L continues to press and deform the workpiece downward until the workpiece is deformed to the required size, at which time the main cylinder stops pressurizing. The workpiece is placed on the workbench. Since the position of the workpiece is not necessarily at the center of the workbench, the movable cross beam L may be deflected during the forging process. After the deflection, the whole plane of the movable cross beam L cannot be kept in parallel with the plane of the workbench, which needs to be corrected by the return cylinder to adjust the movable cross beam L to the horizontal position and ensure the forging accuracy of the workpiece. In the idle stroke stage of the movable cross beam L, the main working cylinder is not pressurized, the movable cross beam L falls under the action of gravity, and the return cylinder supports the movable cross beam L to fall downward. During the falling, the hydraulic oil of the return cylinder is discharged back to the oil tank P. According to the falling speed of the movable cross beam L detected by the displacement sensor, the given value of the proportional flow valve is adjusted, and then the opening degree of the proportional flow valve is adjusted, so as to adjust the falling speed of the movable cross beam L. The larger the opening degree of the proportional flow valve, the faster the speed, and the smaller the opening degree of the proportional flow valve, the slower the speed. The corresponding operating handle can be set on the operating table. The electrical given value of the proportional flow valve changes with the size of the handle swing angle, the opening degree of the valve also changes, and then the falling speed of the movable cross beam L also changes. After the movable cross beam L contacts the workpiece, the main cylinder starts to pressurize and forge. At this time, the proportional flow valve is preset with an opening degree given value matched with the forging speed, and the pressure sensor is used for monitoring the pressure of the return cylinder to assist safety protection.

[0038] Optionally, as shown in Figure 1 the system further comprises a first pressure sensor and a second pressure sensor, the first pressure sensor is arranged at the oil port of the first return cylinder D1, and the second pressure sensor is arranged at the oil port of the second return cylinder D2.

[0039] In the optional embodiment, by arranging the first pressure sensor and the second pressure sensor at the oil ports of the first return cylinder D1 and the second return cylinder D2 respectively, the accurate pressure values in the first return cylinder D1 and the second return cylinder D2 can be obtained, so as to monitor the pressure in the first return cylinder D1 and the second return cylinder D2, and determine whether the pressure in the first return cylinder D1 and the second return cylinder D2 is overpressure, for example, for accident analysis when oil leakage and other accidents occur.

[0040] Optionally, as shown in Figure 1 and 2 , the system further comprises a third return cylinder D3, a fourth return cylinder D4, a fifth electromagnetic valve A5, a sixth electromagnetic valve A6, a third control valve group and a fourth control valve group, one end of the fifth electromagnetic valve A5 is connected with the oil port of the third return cylinder D3, the other end of the fifth electromagnetic valve A5 is used for being connected with the main working pump F, one end of the sixth electromagnetic valve A6 is connected with the oil port of the fourth return cylinder D4, the other end of the sixth electromagnetic valve A6 is used for being connected with the main working pump F, the first end of the third control valve group is connected with the oil port of the third return cylinder D3, the second end of the third control valve group is used for being connected with the oil tank P, the third end of the third control valve group is used for being connected with the deviation correcting oil pump G, the first end of the fourth control valve group is connected with the oil port of the fourth return cylinder D4, the second end of the fourth control valve group is used for being connected with the oil tank P, the third end of the fourth control valve group is used for being connected with the deviation correcting oil pump G, and the fourth end of the fourth control valve group is connected with the fourth end of the first control valve group, the second control valve group and the third control valve group respectively.

[0041] Optionally, the third control valve group comprises a third proportional flow valve B3, a third proportional servo valve C3 and a seventh electromagnetic valve A7, one end of the third proportional flow valve B3 is connected with the oil port of the third return cylinder D3, the other end of the third proportional flow valve B3 is used for being connected with the oil tank P, the first end of the third proportional servo valve C3 is connected with the oil port of the third return cylinder D3, the second end of the third proportional servo valve C3 is used for being connected with the oil tank P, the third end of the third proportional servo valve C3 is used for being connected with the deviation correcting oil pump G, one end of the seventh electromagnetic valve A7 is connected with the oil port of the third return cylinder, and the other end of the seventh electromagnetic valve A7 is connected with the fourth end of the first control valve group, the second control valve group and the fourth control valve group respectively.

[0042] Optionally, the fourth control valve group comprises a fourth proportional flow valve B4, a fourth proportional servo valve C4 and an eighth electromagnetic valve A8, one end of the fourth proportional flow valve B4 is connected with the oil port of the fourth return cylinder D4, the other end of the fourth proportional flow valve B4 is used to be connected with the oil tank P, the first end of the fourth proportional servo valve C4 is connected with the oil port of the fourth return cylinder D4, the second end of the fourth proportional servo valve C4 is used to be connected with the oil tank P, the third end of the fourth proportional servo valve C4 is used to be connected with the deviation correcting oil pump G, one end of the eighth electromagnetic valve A8 is connected with the oil port of the fourth return cylinder, the other end of the eighth electromagnetic valve A8 is connected with the fourth end of the first control valve group and the second control valve group and the other end of the seventh electromagnetic valve A7 respectively.

[0043] Specifically, as shown in Figure 4 When four return cylinders are arranged in the hydraulic machine, the first return cylinder D 1、 The second return cylinder D2, the third return cylinder D3 and the fourth return cylinder D4 are arranged at the four corners of the movable cross beam L, the movable ends of the four return cylinders are connected with the lower ends of the movable cross beam L, the square box is five working cylinders, the four return cylinders are provided with displacement sensors which are built-in or external to the hydraulic cylinders, or the displacement sensors are installed on the four corners of the movable cross beam L and are used to detect the displacement of the four corners of the movable cross beam L.

[0044] Further, the main working pump F and the third return cylinder D3 are communicated through the fifth electromagnetic valve A5, the main working pump F and the fourth return cylinder D4 are communicated through the sixth electromagnetic valve A6, and then the hydraulic oil of the main working pump F can enter the third return cylinder D3 and the fourth return cylinder D4 through the opening and closing control of the fifth electromagnetic valve A5 and the sixth electromagnetic valve A6, so that the first return cylinder D1, the second return cylinder D2, the third return cylinder D3 and the fourth return cylinder D4 can be controlled through the four electromagnetic valves to cooperate with the pushing of the movable cross beam L, so that the movable cross beam L can keep horizontal state in the lifting process. The third return cylinder D3 is communicated with the oil tank P through the third proportional flow valve B3, the fourth return cylinder D4 is communicated with the oil tank P through the fourth proportional flow valve B4, and then the discharge of the hydraulic oil in the third return cylinder D3 and the fourth return cylinder D4 is controlled through the opening and closing of the third proportional flow valve B3 and the fourth proportional flow valve B4, so that in the descending process of the movable cross beam L, through the cooperation of the first proportional flow valve B1, the second proportional flow valve B2, the third proportional flow valve B3 and the fourth proportional flow valve B4, the movable cross beam L can keep horizontal state in the descending process. The first end of the third proportional servo valve C3 is connected with the oil port of the third return cylinder D3, the third end of the third proportional servo valve C3 is connected with the deviation pump G, and then the hydraulic oil of the oil tank P is introduced into the third return cylinder D3 to increase the oil pressure of the third return cylinder D3, and the second end is connected with the oil tank P, the discharged hydraulic oil flows into the oil tank P from the second end, so as to realize the pressure relief of the third return cylinder D3. Similarly, the first end of the fourth proportional servo valve C4 is connected with the oil port of the fourth return cylinder D4, the second end of the fourth proportional servo valve C4 is connected with the oil tank P, when the fourth return cylinder D4 needs to be relieved, the fourth proportional servo valve C4 can control the fourth return cylinder D4 to discharge the hydraulic oil into the oil tank P, and the third end of the fourth proportional servo valve C4 is connected with the deviation oil pump G, so as to control the oil amount of the hydraulic oil entering the fourth return cylinder D4 through the fourth proportional servo valve C4. In the hydraulic machine of the four return cylinders, through the first proportional servo valve C1, the second proportional servo valve C2, the third proportional servo valve C3 and the fourth proportional servo valve C4, the displacement sensors of the four corresponding return cylinders are closed loop controlled, and then according to the data detected by the displacement sensor, the piston position in the four return cylinders is dynamically adjusted through the proportional servo valve, so as to achieve the purpose of leveling control of the movable cross beam L. When the movable cross beam is in the empty stroke descending and ascending, the first return cylinder D1, the second return cylinder D2, the third return cylinder D3 and the fourth return cylinder D4 are communicated through the third electromagnetic valve A3, the fourth electromagnetic valve A4, the seventh electromagnetic valve A7 and the eighth electromagnetic valve A8.

[0045] Exemplarily, when the movable cross beam L stops at the highest position, the first electromagnetic valve A1, the second electromagnetic valve A2, the fifth electromagnetic valve A5 and the sixth electromagnetic valve A6 are closed, the first proportional flow valve B1, the second proportional flow valve B2, the third proportional flow valve B3 and the fourth proportional flow valve B4 are closed, the third electromagnetic valve A3, the fourth electromagnetic valve A4, the seventh electromagnetic valve A7 and the eighth electromagnetic valve A8 are opened, the first proportional servo valve C1, the second proportional servo valve C2, the third proportional servo valve C3 and the fourth proportional servo valve C4 are closed; when the movable cross beam L is in the idle stroke descending, the first electromagnetic valve A1, the second electromagnetic valve A2, the fifth electromagnetic valve A5 and the sixth electromagnetic valve A6 continue to be closed, the first proportional flow valve B1, the second proportional flow valve B2, the third proportional flow valve B3 and the fourth proportional flow valve B4 are opened to adjust the speed of the idle stroke descending, the third electromagnetic valve A3, the fourth electromagnetic valve A4, the seventh electromagnetic valve A7 and the eighth electromagnetic valve A8 continue to be opened, the first proportional servo valve C1, the second proportional servo valve C2, the third proportional servo valve C3 and the fourth proportional servo valve C4 continue to be closed; after the movable cross beam L ends the idle stroke descending and the master cylinder starts to be pressurized, the movable cross beam L needs to enter into the synchronous leveling and deviation correcting state, the first electromagnetic valve A1, the second electromagnetic valve A2, the fifth electromagnetic valve A5 and the sixth electromagnetic valve A6 continue to be closed, the first proportional flow valve B1, the second proportional flow valve B2, the third proportional flow valve B3 and the fourth proportional flow valve B4 are opened to adjust the speed of the forging descending (or a pressure closed loop is formed with the pressure sensor, which is related to the process requirement of the product), the third electromagnetic valve A3, the fourth electromagnetic valve A4, the seventh electromagnetic valve A7 and the eighth electromagnetic valve A8 are closed to make the four return cylinders be controlled separately, the first proportional servo valve C1, the second proportional servo valve C2, the third proportional servo valve C3 and the fourth proportional servo valve C4 enter into the working state to be closed loop controlled with the displacement sensors of the four corresponding return cylinders, so as to achieve the leveling control purpose of the movable cross beam L; when the movable cross beam L reaches the forging end point and stops, the first electromagnetic valve A1, the second electromagnetic valve A2, the fifth electromagnetic valve A5 and the sixth electromagnetic valve A6 continue to be closed, the first proportional flow valve B1, the second proportional flow valve B2, the third proportional flow valve B3 and the fourth proportional flow valve B4 are closed, the third electromagnetic valve A3, the fourth electromagnetic valve A4, the seventh electromagnetic valve A7 and the eighth electromagnetic valve A8 are opened to make the four return cylinders be communicated, and the first proportional servo valve C1, the second proportional servo valve C2, the third proportional servo valve C3 and the fourth proportional servo valve C4 are controlled to be closed.When the movable cross beam L is rising, the first electromagnetic valve A1, the second electromagnetic valve A2, the fifth electromagnetic valve A5 and the sixth electromagnetic valve A6 are opened, the hydraulic oil of the system main working pump F is entered into the return cylinders to lift the movable cross beam L, the first proportional flow valve B1, the second proportional flow valve B2, the third proportional flow valve B3 and the fourth proportional flow valve B4 are closed, the third electromagnetic valve A3, the fourth electromagnetic valve A4, the seventh electromagnetic valve A7 and the eighth electromagnetic valve A8 continue to keep open, the first proportional servo valve C1, the second proportional servo valve C2, the third proportional servo valve C3 and the fourth proportional servo valve C4 continue to keep closed; the movable cross beam L stops rising after reaching the high point, and continues the next cycle action. The deviation correction principle of the movable cross beam L in the forging stage is mainly that a synchronous speed is coarsely adjusted by using the proportional flow valve, then the independent deviation correction pump is supplied with oil, and the proportional servo valve finely adjusts the displacement of the four return cylinders according to the position deviation, so that the synchronous leveling and deviation correction of the movable cross beam L are achieved.

[0046] Optionally, as shown in Figure 1 , the system further comprises a third pressure sensor and a fourth pressure sensor, the third pressure sensor is arranged at the oil port of the third return cylinder D3, and the fourth pressure sensor is arranged at the oil port of the fourth return cylinder D4.

[0047] In the optional embodiment, by arranging the third pressure sensor and the fourth pressure sensor at the oil ports of the third return cylinder D3 and the fourth return cylinder D4 respectively, accurate pressure values in the third return cylinder D3 and the fourth return cylinder D4 can be obtained, so that the pressure in the third return cylinder D3 and the fourth return cylinder D4 is monitored, and whether the pressure in the third return cylinder D3 and the fourth return cylinder D4 is overpressure is judged, when an oil leakage accident occurs in the four return cylinders of the hydraulic machine, the pressure value can be used for accident analysis.

[0048] Optionally, as shown in Figure 1 , the system further comprises an energy accumulator H, and an oil port of the energy accumulator H is used for being connected with the deviation correction oil pump G.

[0049] In the optional embodiment, when the deviation correction oil pump G is insufficient in energy supply or intermittently works, the stored hydraulic oil is released by the energy accumulator H, and the hydraulic oil is continuously delivered to the return cylinder, so that the movable cross beam L continues to keep the horizontal state.

[0050] The hydraulic machine provided by the embodiment of the application comprises the deviation correction system of the hydraulic machine.

[0051] The hydraulic machine of the embodiment has the same beneficial effects as the deviation correction system of the hydraulic machine of the prior art, and details are not repeated here.

[0052] Although the present application has been disclosed with reference to the above embodiments, the application is not limited to the above embodiments. It will be apparent to those skilled in the art that various changes and modifications can be made thereto without departing from the spirit and scope of the application, and it is intended to include all such changes and modifications as fall within the scope of the application.

Claims

1. A correction system for a hydraulic press, characterized by, The hydraulic system comprises a first return cylinder, a second return cylinder, a first electromagnetic valve, a first control valve group, a second electromagnetic valve and a second control valve group, the movable end of the first return cylinder and the movable end of the second return cylinder are respectively used for connecting with the movable cross beam of the hydraulic machine, and the first return cylinder and the second return cylinder are symmetrically arranged below the movable cross beam along the center line of symmetry of the movable cross beam, one end of the first electromagnetic valve is connected with the oil port of the first return cylinder, the other end of the first electromagnetic valve is used for connecting with the main working pump of the hydraulic machine, one end of the second electromagnetic valve is connected with the oil port of the second return cylinder, the other end of the second electromagnetic valve is used for connecting with the main working pump, the first end of the first control valve group is connected with the oil port of the first return cylinder, the second end of the first control valve group is used for connecting with the oil tank of the hydraulic machine, the third end of the first control valve group is used for connecting with the deviation correction oil pump of the hydraulic machine, the first end of the second control valve group is connected with the oil port of the second return cylinder, the second end of the second control valve group is used for connecting with the oil tank, the third end of the second control valve group is used for connecting with the deviation correction oil pump, the fourth end of the first control valve group is connected with the fourth end of the second control valve group. The first control valve group comprises a first proportional flow valve, a first proportional servo valve and a third electromagnetic valve, one end of the first proportional flow valve is connected with the oil port of the first return cylinder, the other end of the first proportional flow valve is used for connecting with the oil tank, the first end of the first proportional servo valve is connected with the oil port of the first return cylinder, the second end of the first proportional servo valve is used for connecting with the oil tank, the third end of the first proportional servo valve is used for connecting with the deviation correction oil pump, one end of the third electromagnetic valve is connected with the oil port of the first return cylinder, the other end of the third electromagnetic valve is connected with the fourth end of the second control valve group. The second control valve group comprises a second proportional flow valve, a second proportional servo valve and a fourth electromagnetic valve, one end of the second proportional flow valve is connected with the oil port of the second return cylinder, the other end of the second proportional flow valve is used for connecting with the oil tank, the first end of the second proportional servo valve is connected with the oil port of the second return cylinder, the second end of the second proportional servo valve is used for connecting with the oil tank, the third end of the second proportional servo valve is used for connecting with the deviation correction oil pump, one end of the fourth electromagnetic valve is connected with the oil port of the second return cylinder, the other end of the fourth electromagnetic valve is connected with the other end of the third electromagnetic valve.

2. The correction system of a hydraulic press according to claim 1, wherein The hydraulic system further comprises a first pressure sensor and a second pressure sensor, the first pressure sensor is arranged at the oil port of the first return cylinder, and the second pressure sensor is arranged at the oil port of the second return cylinder.

3. The correction system of a hydraulic press according to claim 1, wherein The third control valve group comprises a third proportional flow valve, a third proportional servo valve and a seventh electromagnetic valve, one end of the third proportional flow valve is connected with the oil port of the third return cylinder, the other end of the third proportional flow valve is used for being connected with the oil tank, the first end of the third proportional servo valve is connected with the oil port of the third return cylinder, the second end of the third proportional servo valve is used for being connected with the oil tank, the third end of the third proportional servo valve is used for being connected with the deviation correcting oil pump, one end of the seventh electromagnetic valve is connected with the oil port of the third return cylinder, the other end of the seventh electromagnetic valve is connected with the fourth end of the first control valve group, the second control valve group and the fourth control valve group respectively.

4. The correction system of a hydraulic press according to claim 3, wherein The fourth control valve group comprises a fourth proportional flow valve, a fourth proportional servo valve and an eighth electromagnetic valve, one end of the fourth proportional flow valve is connected with the oil port of the fourth return cylinder, the other end of the fourth proportional flow valve is used for being connected with the oil tank, the first end of the fourth proportional servo valve is connected with the oil port of the fourth return cylinder, the second end of the fourth proportional servo valve is used for being connected with the oil tank, the third end of the fourth proportional servo valve is used for being connected with the deviation correcting oil pump, one end of the eighth electromagnetic valve is connected with the oil port of the fourth return cylinder, the other end of the eighth electromagnetic valve is connected with the fourth end of the first control valve group and the second control valve group and the other end of the seventh electromagnetic valve.

5. The correction system of a hydraulic press according to claim 4, wherein The third control valve group comprises a third proportional flow valve, a third proportional servo valve and a seventh electromagnetic valve, one end of the third proportional flow valve is connected with the oil port of the third return cylinder, the other end of the third proportional flow valve is used for being connected with the oil tank, the first end of the third proportional servo valve is connected with the oil port of the third return cylinder, the second end of the third proportional servo valve is used for being connected with the oil tank, the third end of the third proportional servo valve is used for being connected with the deviation correcting oil pump, one end of the seventh electromagnetic valve is connected with the oil port of the third return cylinder, the other end of the seventh electromagnetic valve is connected with the fourth end of the first control valve group, the second control valve group and the fourth control valve group respectively.

6. The correction system of a hydraulic press according to claim 3, wherein The fourth control valve group comprises a fourth proportional flow valve, a fourth proportional servo valve and an eighth electromagnetic valve, one end of the fourth proportional flow valve is connected with the oil port of the fourth return cylinder, the other end of the fourth proportional flow valve is used for being connected with the oil tank, the first end of the fourth proportional servo valve is connected with the oil port of the fourth return cylinder, the second end of the fourth proportional servo valve is used for being connected with the oil tank, the third end of the fourth proportional servo valve is used for being connected with the deviation correcting oil pump, one end of the eighth electromagnetic valve is connected with the oil port of the fourth return cylinder, the other end of the eighth electromagnetic valve is connected with the fourth end of the first control valve group and the second control valve group and the other end of the seventh electromagnetic valve.

7. The correction system of a hydraulic press according to claim 1, wherein The third control valve group comprises a third proportional flow valve, a third proportional servo valve and a seventh electromagnetic valve, one end of the third proportional flow valve is connected with the oil port of the third return cylinder, the other end of the third proportional flow valve is used for being connected with the oil tank, the first end of the third proportional servo valve is connected with the oil port of the third return cylinder, the second end of the third proportional servo valve is used for being connected with the oil tank, the third end of the third proportional servo valve is used for being connected with the deviation correcting oil pump, one end of the seventh electromagnetic valve is connected with the oil port of the third return cylinder, the other end of the seventh electromagnetic valve is connected with the fourth end of the first control valve group, the second control valve group and the fourth control valve group respectively.

8. A hydraulic machine characterized by The fourth control valve group comprises a fourth proportional flow valve, a fourth proportional servo valve and an eighth electromagnetic valve, one end of the fourth proportional flow valve is connected with the oil port of the fourth return cylinder, the other end of the fourth proportional flow valve is used for being connected with the oil tank, the first end of the fourth proportional servo valve is connected with the oil port of the fourth return cylinder, the second end of the fourth proportional servo valve is used for being connected with the oil tank, the third end of the fourth proportional servo valve is used for being connected with the deviation correcting oil pump, one end of the eighth electromagnetic valve is connected with the oil port of the fourth return cylinder, the other end of the eighth electromagnetic valve is connected with the fourth end of the first control valve group and the second control valve group and the other end of the seventh electromagnetic valve. The third control valve group comprises a third proportional flow valve, a third proportional servo valve and a seventh electromagnetic valve, one end of the third proportional flow valve is connected with the oil port of the third return cylinder, the other end of the third proportional flow valve is used for being connected with the oil tank, the first end of the third proportional servo valve is connected with the oil port of the third return cylinder, the second end of the third proportional servo valve is used for being connected with the oil tank, the third end of the third proportional servo valve is used for being connected with the deviation correcting oil pump, one end of the seventh electromagnetic valve is connected with the oil port of the third return cylinder, the other end of the seventh electromagnetic valve is connected with the fourth end of the first control valve group, the second control valve group and the fourth control valve group respectively. The fourth control valve group comprises a fourth proportional flow valve, a fourth proportional servo valve and an eighth electromagnetic valve, one end of the fourth proportional flow valve is connected with the oil port of the fourth return cylinder, the other end of the fourth proportional flow valve is used for being connected with the oil tank, the first end of the fourth proportional servo valve is connected with the oil port of the fourth return cylinder, the second end of the fourth proportional servo valve is used for being connected with the oil tank, the third end of the fourth proportional servo valve is used for being connected with the deviation correcting oil pump, one end of the eighth electromagnetic valve is connected with the oil port of the fourth return cylinder, the other end of the eighth electromagnetic valve is connected with the fourth end of the first control valve group and the second control valve group and the other end of the seventh electromagnetic valve. The third control valve group comprises a third proportional flow valve, a third proportional servo valve and a seventh electromagnetic valve, one end of the third proportional flow valve is connected with the oil port of the third return cylinder, the other end of the third proportional flow valve is used for being connected with the oil tank, the first end of the third proportional servo valve is connected with the oil port of the third return cylinder, the second end of the third proportional servo valve is used for being connected with the oil tank, the third end of the third proportional servo valve is used for being connected with the deviation correcting oil pump, one end of the seventh electromagnetic valve is connected with the oil port of the third return cylinder, the other end of the seventh electromagnetic valve is connected with the fourth end of the first control valve group, the second control valve group and the fourth control valve group respectively. The fourth control valve group comprises a fourth proportional flow valve, a fourth proportional servo valve and an eighth electromagnetic valve, one end of the fourth proportional flow valve is connected with the oil port of the fourth return cylinder, the other end of the fourth proportional flow valve is used for being connected with the oil tank, the first end of the fourth proportional servo valve is connected with the oil port of the fourth return cylinder, the second end of the fourth proportional servo valve is used for being connected with the oil tank, the third end of the fourth proportional servo valve is used for being connected with the deviation correcting oil pump, one end of the eighth electromagnetic valve is connected with the oil port of the fourth return cylinder, the other end of the eighth electromagnetic valve is connected with the fourth end of the first control valve group and the second control valve group and the other end of the seventh electromagnetic valve. The third control valve group comprises a third proportional flow valve, a third proportional servo valve and a seventh electromagnetic valve, one end of the third proportional flow valve is connected with the oil port of the third return cylinder, the other end of the third proportional flow valve is used for being connected with the oil tank, the first end of the third proportional servo valve is connected with the oil port of the third return cylinder, the second end of the third proportional servo valve is used for being connected with the oil tank, the third end of the third proportional servo valve is used for being connected with the deviation correcting oil pump, one end of the seventh electromagnetic valve is connected with the oil port of the third return cylinder, the other end of the seventh electromagnetic valve is connected with the fourth end of the first control valve group, the second control valve group and the fourth control valve group respectively. The fourth control valve group comprises a fourth proportional flow valve, a fourth proportional servo valve and an eighth electromagnetic valve, one end of the fourth proportional flow valve is connected with the oil port of the fourth return cylinder, the other end of the fourth proportional flow valve is used for being connected with the oil tank, the first end of the fourth proportional servo valve is connected with the oil port of the fourth return cylinder, the second end of the fourth proportional servo valve is used for being connected with the oil tank,

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