Hydraulic loading and protection system

Abstract

The invention relates to a hydraulic loading and protection system, belongs to the technical field of hydraulic loading, and solves the problems of poor stability and reliability of a hydraulic loading system in the prior art. Comprising a main loading hydraulic cylinder, a vertical loading control valve block and an emergency lifting valve block, the vertical loading control valve block is used for controlling the loading working condition of the system according to an external function instruction so as to control the main loading hydraulic cylinder to work; wherein the loading conditions comprise a working condition, a pressing loading condition and a lifting loading condition; the emergency lift valve block is used for storing energy when the system is powered on; the main loading hydraulic cylinder is also used for carrying out lifting loading control on the main loading hydraulic cylinder when the system has an emergency situation; wherein the emergency situation comprises system power failure and system power failure.

Description

Technical Field

[0001] The present invention relates to the technical field of hydraulic loading, and in particular to a hydraulic loading and protection system. Background Art

[0002] In the test loading equipment, lifting, forging and other industries, there are strict requirements for the loading speed, control accuracy and emergency protection of the hydraulic loading system, especially for the fast-response test loading equipment and lifting industries. In the traditional hydraulic loading system, the hydraulic oil source directly loads the actuator cylinder after passing through the control valve. If an emergency occurs, the hydraulic system is locked, and then the loaded hydraulic oil is released through a switch valve. However, these all have some shortcomings to a greater or lesser extent. For example, the hydraulic oil source directly loads the actuator cylinder after passing through the control valve. This method has problems such as the actuator cylinder shaking when the loading pressure is insufficient; and the loading system cannot quickly escape from the dangerous state when an emergency occurs.

[0003] At present, in the test loading equipment, lifting, forging and pressing industries, especially in the test loading and lifting equipment, the hydraulic oil source is used to directly load the actuator after passing through the control valve. If an emergency occurs, the hydraulic system is locked, and then a switch valve is used to release the loaded hydraulic oil. This cannot solve the loading stability and reliability functions well. Summary of the invention

[0004] In view of the above analysis, an embodiment of the present invention aims to provide a hydraulic loading and protection system to solve the problem of poor stability and reliability of the existing hydraulic loading system.

[0005] The embodiment of the present invention provides a hydraulic loading and protection system, including a main loading hydraulic cylinder, a vertical loading control valve block and an emergency lifting valve block;

[0006] The vertical loading control valve block is used to control the loading condition of the system according to the external function instruction, and then control the operation of the main loading hydraulic cylinder; wherein the loading condition includes the working condition, the downward pressure loading condition and the lifting loading condition;

[0007] The emergency lifting valve block is used to store energy when the system is powered on; it is also used to control the lifting and loading of the main loading hydraulic cylinder when an emergency occurs in the system; wherein the emergency includes system power failure and system power outage.

[0008] Further,

[0009] The oil inlet and oil return port of the vertical loading control valve block are respectively connected to the oil inlet and oil return port of the loading pump source; the first working oil port and the second working oil port of the vertical loading control valve block are respectively connected to the rodless chamber and the rod chamber of the main loading hydraulic cylinder; the emergency oil port of the vertical loading control valve block is connected to the oil inlet of the emergency lifting valve block;

[0010] The working oil port of the emergency lifting valve block is communicated with the rod chamber of the main loading hydraulic cylinder; the oil return port of the emergency lifting valve block is communicated with the oil return port of the loading pump source.

[0011] Furthermore, the loading condition in the vertical loading control valve block also includes a debugging condition; the system also includes a debugging valve block;

[0012] The debugging valve block is used to control the debugging working condition of the system according to the received debugging instructions when the system is in the debugging working condition, thereby controlling the operation of the main loading hydraulic cylinder; wherein the adjustment working condition includes debugging the pressing loading working condition and debugging the lifting loading working condition;

[0013] The first working oil port and the second working oil port of the debugging valve block are respectively connected to the rodless chamber and the rod chamber of the main loading hydraulic cylinder; the oil inlet of the debugging valve block is connected to the emergency oil port of the vertical loading control valve block; the oil return port of the debugging valve block is connected to the oil return port of the loading pump source.

[0014] Further, the vertical loading control valve block includes a filter, a first three-position four-way solenoid valve, a first one-way two-position two-way hydraulic control valve, a second one-way two-position two-way hydraulic control valve, a third one-way two-position two-way hydraulic control valve, a three-position three-way solenoid valve, a third adjustable one-way throttle valve, a first overflow valve and a second overflow valve;

[0015] The oil inlet of the filter serves as the oil inlet of the vertical loading control valve block, and the oil outlet is connected to the oil inlet of the first three-position four-way solenoid valve; the oil return port of the first three-position four-way solenoid valve is connected to the oil return port of the loading pump source;

[0016] The A working oil port of the first three-position four-way solenoid valve is connected to the oil inlet of the first one-way two-position two-way hydraulic control valve, and the B working oil port is connected to the oil inlet of the second one-way two-position two-way hydraulic control valve;

[0017] The working oil ports of the first one-way two-position two-way hydraulic control valve and the second one-way two-position two-way hydraulic control valve serve as the first working oil port and the second working oil port of the vertical loading control valve block respectively; the control oil inlet of the first one-way two-position two-way hydraulic control valve is connected to the control oil inlet of the second one-way two-position two-way hydraulic control valve; the control oil outlet of the first one-way two-position two-way hydraulic control valve and the control oil outlet of the second one-way two-position two-way hydraulic control valve are connected to the oil return port of the first three-position four-way solenoid valve;

[0018] The oil inlet of the three-position three-way solenoid valve is connected to the oil return port of the first three-position four-way solenoid valve, the working oil port is connected to the control oil inlet of the first one-way two-position two-way hydraulic control valve, and the oil return port is connected to the oil inlet of the first three-position four-way solenoid valve, and serves as the emergency oil port of the vertical loading control valve block;

[0019] The oil inlet of the third adjustable one-way throttle valve is communicated with the oil return port of the first three-position four-way solenoid valve, and the oil outlet is communicated with the oil inlet of the third one-way two-position two-way hydraulic control valve; the working oil port of the third one-way two-position two-way hydraulic control valve is communicated with the working oil port of the first one-way two-position two-way hydraulic control valve, the control oil outlet is communicated with the oil return port of the first three-position four-way solenoid valve, and the control oil inlet is communicated with the working oil port of the three-position three-way solenoid valve;

[0020] The oil inlet of the first overflow valve is connected to the oil return port of the first three-position four-way solenoid valve, and the oil drain port is connected to the working oil port of the first one-way two-position two-way hydraulic control valve; the oil inlet of the second overflow valve is connected to the oil return port of the first three-position four-way solenoid valve, and the oil drain port is connected to the working oil port of the second one-way two-position two-way hydraulic control valve.

[0021] Further, the emergency lift valve block includes a first stop valve, a second stop valve, an accumulator, a first one-way two-position two-way solenoid valve, and a second one-way two-position two-way solenoid valve;

[0022] The oil inlet of the second one-way two-position two-way solenoid valve serves as the oil inlet of the emergency lift valve block, and the working oil port is connected to the oil inlet of the first stop valve; the oil outlet of the first stop valve is connected to the oil inlet of the accumulator;

[0023] The oil inlet of the first one-way two-position two-way solenoid valve is connected to the oil inlet of the first stop valve, and the working oil port serves as the working oil port of the emergency lifting valve block;

[0024] The oil inlet end of the second stop valve is communicated with the oil inlet port of the first stop valve, and the oil outlet end serves as the oil return port of the emergency lifting valve block.

[0025] Further, the debugging valve block includes a second three-position four-way solenoid valve, a first adjustable one-way throttle valve, a second adjustable one-way throttle valve, a first hydraulically controlled one-way valve and a second hydraulically controlled one-way valve;

[0026] The oil inlet and oil outlet of the second three-position four-way solenoid valve serve as the oil inlet and oil return port of the debugging valve block respectively; the A working oil port of the second three-position four-way solenoid valve is connected to the oil inlet of the first adjustable one-way throttle valve; the B working oil port of the second three-position four-way solenoid valve is connected to the oil inlet of the second adjustable one-way throttle valve;

[0027] The oil outlet of the first adjustable one-way throttle valve is communicated with the oil inlet of the first hydraulically controlled one-way valve; the oil outlet of the first hydraulically controlled one-way valve serves as the first working oil port of the debugging valve block, and the control oil port is communicated with the oil inlet of the second hydraulically controlled one-way valve;

[0028] The oil outlet of the second adjustable one-way throttle valve is connected to the oil inlet of the second hydraulically controlled one-way valve; the oil outlet of the second hydraulically controlled one-way valve serves as the second working oil port of the debugging valve block, and the control oil port is connected to the oil inlet of the first hydraulically controlled one-way valve.

[0029] Furthermore, the middle position of the first three-position four-way solenoid valve is O-type, the springs of the first one-way two-position two-way hydraulic control valve and the second one-way two-position two-way hydraulic control valve are in the normally open position; the spring of the third one-way two-position two-way hydraulic control valve is in the normally closed position;

[0030] The middle position of the three-position three-way solenoid valve is a low-pressure oil circuit state, and the left position is a vertical loading control oil circuit connection state; wherein, the low-pressure oil circuit state is that the oil inlet is connected to the working oil port and the oil return port is closed, and the vertical loading control oil circuit connection state is that the oil return port is connected to the working oil port and the oil inlet is closed.

[0031] Furthermore, the spring of the first one-way two-position two-way solenoid valve is in a normally closed position, and the spring of the second one-way two-position two-way solenoid valve is in a normally open position; the first stop valve is in a connected state when the power is off, and the second stop valve is in a cut-off state when the power is off.

[0032] Furthermore, the middle position of the second three-position four-way solenoid valve is Y-shaped.

[0033] Furthermore, the third adjustable one-way throttle valve is provided with a backup power supply.

[0034] Compared with the prior art, the present invention can achieve at least one of the following beneficial effects:

[0035] A hydraulic loading and protection system provided by the present invention comprises a main loading hydraulic cylinder, a vertical loading control valve block and an emergency lifting valve block; the vertical loading control valve block is used to control the loading condition of the system according to external functional instructions, thereby controlling the operation of the main loading hydraulic cylinder; the loading condition includes working condition, downward pressure loading condition and lifting loading condition; the emergency lifting valve block is used to store energy when the system is powered on, and is also used to lift and load the main loading hydraulic cylinder when an emergency occurs in the system; emergency situations include system power failure and system power outage, which solves the problem of poor stability and reliability of the existing hydraulic loading system. When the system is working, the hydraulic control oil circuit is controlled by the solenoid valve, and the hydraulic control oil circuit is connected Then open the hydraulic control switch valve. At this time, the loading solenoid valve is operated. Since the loading solenoid valve is a precision equipment, a single debugging oil circuit is set up for debugging when debugging the loading system. After the hydraulic control oil circuit is connected, open the hydraulic control switch valve, and then operate the debugging solenoid valve. In addition, in order to prevent emergencies such as load loss or power outages, the system is equipped with an emergency protection oil circuit. When an emergency occurs, the emergency oil circuit automatically starts to protect the loading system, which can well solve the problems of loading stability and emergency protection of emergencies. Moreover, this type of system belongs to the hydraulic control structure, and its reliability is greatly enhanced, which is conducive to the use of hydraulic loading in test loading equipment, lifting, and forging environments, and reduces the use and maintenance costs of the system.

[0036] In the present invention, the above-mentioned technical solutions can also be combined with each other to achieve more preferred combination solutions. Other features and advantages of the present invention will be described in the subsequent description, and some advantages can become obvious from the description, or can be understood by practicing the present invention. The purpose and other advantages of the present invention can be realized and obtained through the contents particularly pointed out in the description and the drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] The drawings are only for the purpose of illustrating particular embodiments and are not to be considered limiting of the present invention. Like reference symbols denote like components throughout the drawings.

[0038] Figure 1 A schematic diagram of the structure of a hydraulic loading and protection system provided in an embodiment of the present invention;

[0039] Reference numerals:

[0040] 1-filter; 2-first three-position four-way solenoid valve; 31-first one-way two-position two-way hydraulically controlled valve; 32-second one-way two-position two-way hydraulically controlled valve; 4-third one-way two-position two-way hydraulically controlled valve; 5-third adjustable one-way throttle valve; 6-three-position three-way solenoid valve; 71-first overflow valve; 72-second overflow valve; 8-second three-position four-way solenoid valve; 91-first adjustable one-way throttle valve; 92-second adjustable one-way throttle valve; 101-first hydraulically controlled one-way valve; 102-second hydraulically controlled one-way valve; 11-first one-way two-position two-way solenoid valve; 12-first stop valve; 13-accumulator; 14-second stop valve; 15-second one-way two-position two-way solenoid valve. DETAILED DESCRIPTION

[0041] The preferred embodiments of the present invention are described in detail below in conjunction with the accompanying drawings, wherein the accompanying drawings constitute a part of this application and are used together with the embodiments of the present invention to illustrate the principles of the present invention, but are not used to limit the scope of the present invention.

[0042] A specific embodiment of the present invention discloses a hydraulic loading and protection system, such as Figure 1 As shown, it includes a main loading hydraulic cylinder, a vertical loading control valve block and an emergency lifting valve block;

[0043] The vertical loading control valve block is used to control the loading condition of the system according to the external function instruction, and then control the operation of the main loading hydraulic cylinder; wherein the loading condition includes the working condition, the downward pressure loading condition and the lifting loading condition;

[0044] The emergency lifting valve block is used to store energy when the system is powered on; it is also used to control the lifting and loading of the main loading hydraulic cylinder when an emergency occurs in the system; wherein the emergency includes system power failure and system power outage.

[0045] During implementation, the oil inlet and oil return port of the vertical loading control valve block are respectively connected to the oil inlet and oil return port of the loading pump source; the first working oil port and the second working oil port of the vertical loading control valve block are respectively connected to the rodless chamber and the rod chamber of the main loading hydraulic cylinder; the emergency oil port of the vertical loading control valve block is connected to the oil inlet of the emergency lifting valve block;

[0046] The working oil port of the emergency lifting valve block is communicated with the rod chamber of the main loading hydraulic cylinder; the oil return port of the emergency lifting valve block is communicated with the oil return port of the loading pump source.

[0047] Preferably, the loading condition in the vertical loading control valve block also includes a debugging condition; the system also includes a debugging valve block;

[0048] The debugging valve block is used to control the debugging working condition of the system according to the received debugging instructions when the system is in the debugging working condition, thereby controlling the operation of the main loading hydraulic cylinder; wherein the adjustment working condition includes debugging the pressing loading working condition and debugging the lifting loading working condition;

[0049] The first working oil port and the second working oil port of the debugging valve block are respectively connected to the rodless chamber and the rod chamber of the main loading hydraulic cylinder; the oil inlet of the debugging valve block is connected to the emergency oil port of the vertical loading control valve block; the oil return port of the debugging valve block is connected to the oil return port of the loading pump source.

[0050] In specific implementation, the vertical loading control valve block includes a filter 1, a first three-position four-way solenoid valve 2, a first one-way two-position two-way hydraulic control valve 31, a second one-way two-position two-way hydraulic control valve 32, a third one-way two-position two-way hydraulic control valve 4, a three-position three-way solenoid valve 6, a third adjustable one-way throttle valve 5, a first overflow valve 71 and a second overflow valve 72;

[0051] The oil inlet of the filter 1 serves as the oil inlet of the vertical loading control valve block, and the oil outlet is connected to the oil inlet of the first three-position four-way solenoid valve 2; the oil return port of the first three-position four-way solenoid valve 2 is connected to the oil return port of the loading pump source;

[0052] The A working oil port of the first three-position four-way solenoid valve 2 is connected to the oil inlet of the first one-way two-position two-way hydraulic control valve 31, and the B working oil port is connected to the oil inlet of the second one-way two-position two-way hydraulic control valve 32;

[0053] The working oil ports of the first one-way two-position two-way hydraulic control valve 31 and the second one-way two-position two-way hydraulic control valve 32 serve as the first working oil port and the second working oil port of the vertical loading control valve block respectively; the control oil inlet of the first one-way two-position two-way hydraulic control valve 31 is connected to the control oil inlet of the second one-way two-position two-way hydraulic control valve 32; the control oil outlet of the first one-way two-position two-way hydraulic control valve 31 and the control oil outlet of the second one-way two-position two-way hydraulic control valve 32 are connected to the oil return port of the first three-position four-way solenoid valve 2;

[0054] The oil inlet of the three-position three-way solenoid valve 6 is connected to the oil return port of the first three-position four-way solenoid valve 2, the working oil port is connected to the control oil inlet of the first one-way two-position two-way hydraulic control valve 31, and the oil return port is connected to the oil inlet of the first three-position four-way solenoid valve 2, and serves as the emergency oil port of the vertical loading control valve block;

[0055] The oil inlet of the third adjustable one-way throttle valve 5 is connected with the oil return port of the first three-position four-way solenoid valve 2, and the oil outlet is connected with the oil inlet of the third one-way two-position two-way hydraulic control valve 4; the working oil port of the third one-way two-position two-way hydraulic control valve 4 is connected with the working oil port of the first one-way two-position two-way hydraulic control valve 31, the control oil outlet is connected with the oil return port of the first three-position four-way solenoid valve 2, and the control oil inlet is connected with the working oil port of the three-position three-way solenoid valve 6;

[0056] The oil inlet of the first overflow valve 71 is connected to the oil return port of the first three-position four-way solenoid valve 2, and the oil drain port is connected to the working oil port of the first one-way two-position two-way hydraulic control valve 31; the oil inlet of the second overflow valve 72 is connected to the oil return port of the first three-position four-way solenoid valve 2, and the oil drain port is connected to the working oil port of the second one-way two-position two-way hydraulic control valve 32.

[0057] In a specific implementation, the emergency lift valve block includes a first stop valve 12, a second stop valve 14, an accumulator 13, a first one-way two-position two-way solenoid valve 11, and a second one-way two-position two-way solenoid valve 15;

[0058] The oil inlet of the second one-way two-position two-way solenoid valve 15 serves as the oil inlet of the emergency lift valve block, and the working oil port is connected to the oil inlet of the first stop valve 12; the oil outlet of the first stop valve 12 is connected to the oil inlet of the accumulator 13;

[0059] The oil inlet of the first one-way two-position two-way solenoid valve 11 is connected to the oil inlet of the first stop valve 12, and the working oil port serves as the working oil port of the emergency lifting valve block;

[0060] The oil inlet end of the second stop valve 14 is communicated with the oil inlet port of the first stop valve 12, and the oil outlet end serves as the oil return port of the emergency lift valve block.

[0061] In specific implementation, the debugging valve block includes a second three-position four-way solenoid valve 8, a first adjustable one-way throttle valve 91, a second adjustable one-way throttle valve 92, a first hydraulically controlled one-way valve 101 and a second hydraulically controlled one-way valve 102;

[0062] The oil inlet and oil outlet of the second three-position four-way solenoid valve 8 serve as the oil inlet and oil return port of the debugging valve block respectively; the A working oil port of the second three-position four-way solenoid valve 8 is connected to the oil inlet of the first adjustable one-way throttle valve 91; the B working oil port of the second three-position four-way solenoid valve 8 is connected to the oil inlet of the second adjustable one-way throttle valve 92;

[0063] The oil outlet of the first adjustable one-way throttle valve 91 is connected to the oil inlet of the first hydraulically controlled one-way valve 101; the oil outlet of the first hydraulically controlled one-way valve 101 serves as the first working oil port of the debugging valve block, and the control oil port is connected to the oil inlet of the second hydraulically controlled one-way valve 102;

[0064] The oil outlet of the second adjustable one-way throttle valve 92 is connected to the oil inlet of the second hydraulically controlled one-way valve 102; the oil outlet of the second hydraulically controlled one-way valve 102 serves as the second working oil port of the debugging valve block, and the control oil port is connected to the oil inlet of the first hydraulically controlled one-way valve 101.

[0065] Specifically, the middle position of the first three-position four-way solenoid valve 2 is O-type, the springs of the first one-way two-position two-way hydraulic control valve 31 and the second one-way two-position two-way hydraulic control valve 32 are in the normally open position; the spring of the third one-way two-position two-way hydraulic control valve 4 is in the normally closed position;

[0066] The middle position of the three-position three-way solenoid valve 6 is a low-pressure oil circuit state, and the left position is a vertical loading control oil circuit connection state; wherein, the low-pressure oil circuit state is that the oil inlet is connected to the working oil port and the oil return port is closed, and the vertical loading control oil circuit connection state is that the oil return port is connected to the working oil port and the oil inlet is closed.

[0067] It should be noted that the right position of the three-position three-way solenoid valve 6 is also a low-pressure oil circuit state.

[0068] Specifically, the spring of the first one-way two-position two-way solenoid valve 11 is in the normally closed position, and the spring of the second one-way two-position two-way solenoid valve 15 is in the normally open position; the first stop valve 12 is in the connected state when the power is off, and the second stop valve 14 is in the cut-off state when the power is off.

[0069] Specifically, the middle position of the second three-position four-way solenoid valve 8 is Y-shaped.

[0070] Furthermore, the third adjustable one-way throttle valve 5 is provided with a backup power supply.

[0071] During implementation, the system is in an initial state when not powered on, wherein the first three-position four-way solenoid valve 2 is in a normally open state (i.e., a middle position), the three-position three-way solenoid valve 6 is in a low-pressure oil circuit state (i.e., a middle position), the third one-way two-position two-way hydraulic control valve 4 is in a low-pressure normally closed connected state (i.e., a normally closed position), the first one-way two-position two-way hydraulic control valve 31 and the second one-way two-position two-way hydraulic control valve 32 are in a low-pressure normally open state (i.e., a normally open position), the second one-way two-position two-way solenoid valve 15 is in a normally open state (i.e., a normally open position), the first one-way two-position two-way solenoid valve 11 is in a normally closed connected state (i.e., a normally closed position), the stop valve 12 is in a connected state, the second three-position four-way solenoid valve 8 is in a Y-direction connection oil return low pressure state (i.e., a middle position), the first hydraulically controlled one-way valve 101 and the second hydraulically controlled one-way valve 102 are in a cut-off state, and the second stop valve 14 is in a cut-off state.

[0072] During implementation, the loading conditions include working conditions, downward pressure loading conditions and lifting loading conditions; specifically:

[0073] Working conditions: the loading pump source starts and enters the working state, the three-position three-way solenoid valve 6 switches to the vertical loading control oil circuit connection state (i.e., the left position), and the main control oil circuit enters the third one-way two-position two-way hydraulic control valve 4, the first one-way two-position two-way hydraulic control valve 31 and the second one-way two-position two-way hydraulic control valve 32. At this time, the third one-way two-position two-way hydraulic control valve 4 switches to the disconnected state (i.e., the normally open position), and the first one-way two-position two-way hydraulic control valve 31 and the second one-way two-position two-way hydraulic control valve 32 switch to the closed connection state (i.e., the normally closed position); at the same time, the second three-position four-way solenoid valve 8 is in the middle Y connection return oil low pressure state (i.e., the middle position), and the debugging valve block is in the disconnected state.

[0074] Downward pressure loading condition: switch the first three-position four-way solenoid valve 2 to the left-side loading closed state (i.e., the left-side parallel position), connect the main control oil circuit, and the hydraulic oil source flows through the first one-way two-position two-way hydraulic control valve 31 and then enters the rodless chamber of the main loading hydraulic cylinder. The return oil source flows from the rod chamber of the hydraulic cylinder through the second one-way two-position two-way hydraulic control valve 32 and the first three-position four-way solenoid valve 2 and enters the oil tank.

[0075] Lifting and loading condition: switch the first three-position four-way solenoid valve 2 to the right-side loading and lifting closed state (i.e., the right-side cross position), the main oil circuit is connected, the hydraulic oil source flows through the second one-way two-position two-way hydraulic control valve 32 and then enters the rod chamber of the main loading hydraulic cylinder, and the return oil source flows from the rodless chamber of the hydraulic cylinder through the first one-way two-position two-way hydraulic control valve 31 and the first three-position four-way solenoid valve 2 and enters the oil tank; at the same time, the overpressure oil source of the main control hydraulic cylinder, the first one-way two-position two-way hydraulic control valve 31, and the second one-way two-position two-way hydraulic control valve 32 is relieved through the first overflow valve 71 and the second overflow valve 72 to prevent overpressure of the working hydraulic pressure.

[0076] Debugging conditions: switch the three-position three-way solenoid valve 6 to the low-pressure oil circuit state (i.e., the middle position), and the first three-position four-way solenoid valve 2 is in the normally open state (i.e., the middle position). It can be understood that at this time, the vertical loading control valve block stops working and is debugged by the debugging valve block.

[0077] During implementation, the adjustment of working conditions includes debugging the downward pressure loading condition and debugging the upward loading condition; specifically:

[0078] Debug the downward pressure loading condition: the second three-position four-way solenoid valve 8 is switched to the left-side downward pressure loading state (i.e. the left-side parallel position), and the oil source flows through the first adjustable one-way throttle valve 91 and the first hydraulically controlled one-way valve 101, and enters the rodless chamber of the main loading hydraulic cylinder; at the same time, the oil source passing through the first adjustable one-way throttle valve 91 is led to the second hydraulically controlled one-way valve 102, which is opened, and the downward pressure loading oil circuit is opened for debugging, and flows back to the oil tank through the second hydraulically controlled one-way valve 102, the second adjustable one-way throttle valve 92 and the second three-position four-way solenoid valve 8 for downward pressure loading debugging.

[0079] Debugging the lifting and loading conditions: the second three-position four-way solenoid valve 8 is switched to the right-side lifting and loading state (i.e. the right-side cross position), and the oil source flows through the second adjustable one-way throttle valve 92 and the second hydraulically controlled one-way valve 102, and enters the rod chamber of the main loading hydraulic cylinder; at the same time, the oil source passing through the second adjustable one-way throttle valve 92 is led to the first hydraulically controlled one-way valve 101, which is opened, and the debugging lifting and loading oil circuit is opened, and the oil flows back to the oil tank through the first hydraulically controlled one-way valve 101, the first adjustable one-way throttle valve 91 and the second three-position four-way solenoid valve 8 for lifting and loading debugging.

[0080] It can be understood that the three-position four-way solenoid valve in the vertical loading control valve block is a precision device. Directly using the valve block to debug external functions will cause damage and be very costly. In this embodiment, a single debugging valve block is provided to debug external functions. The three-position four-way solenoid valve in the debugging valve block is of ordinary type. After the debugging is completed, the vertical loading control valve block can be used, which is more convenient and avoids damage to the precision solenoid valve.

[0081] During implementation, after the system is powered on, the emergency lift valve block is in an energy storage state; specifically:

[0082] The first one-way two-position two-way solenoid valve 11 switches to a normally open state (i.e., normally open position) after being energized, and the second one-way two-position two-way solenoid valve 15 switches to a normally closed connected state (i.e., normally closed position) after being energized, and the emergency lifting valve block is in an energy storage state.

[0083] During implementation, the emergency lifting valve block performs lifting and loading control on the main loading hydraulic cylinder when an emergency occurs in the system, specifically:

[0084] When power is cut off or blackout occurs, the three-position three-way solenoid valve 6 is powered off, the main control oil circuit is in a disconnected state, and the system is in a locked state; the third one-way two-position two-way hydraulic control valve 4 is restored to the normally closed connected state (i.e., normally closed position), and the first one-way two-position two-way hydraulic control valve 31 and the second one-way two-position two-way hydraulic control valve 32 are restored to the normally open cut-off state (i.e., normally open position); the first three-position four-way solenoid valve 2 is restored to the normally open cut-off state (i.e., middle position) due to power cut; at the same time, the second three-position four-way solenoid valve 8 is in the middle Y-connected oil return low pressure state (i.e., middle position), and the debugging valve block is in a disconnected state;

[0085] At the same time, the first one-way two-position two-way solenoid valve 11 is restored to the normally closed connected state when the power is off (i.e., the normally closed position), and the second one-way two-position two-way solenoid valve 15 is restored to the normally open cut-off state (i.e., the normally open position); the pressure oil source of the accumulator 13 flows to the rod chamber of the main loading hydraulic cylinder through the first one-way two-position two-way solenoid valve 11, and lifts the hydraulic cylinder in the reverse direction, and the return oil source of the main loading hydraulic cylinder passes through the third one-way two-position two-way hydraulic control valve 4, enters the third adjustable one-way throttle valve 5, and then flows back to the pump source tank; among them, the third adjustable one-way throttle valve 5 controls the lifting speed.

[0086] It should be noted that in the emergency lifting valve block, the first one-way two-position two-way solenoid valve 11 is restored to the normally closed connected state when the power is off (i.e., the normally closed position), and the second one-way two-position two-way solenoid valve 15 is restored to the normally open cut-off state (i.e., the normally open position), and automatically switches when the power is off, without the need for a backup power supply; the third adjustable one-way throttle valve 5 needs a backup power supply for control because it needs to control the flow rate.

[0087] Compared with the prior art, this embodiment provides a hydraulic loading and protection system, including a main loading hydraulic cylinder, a vertical loading control valve block and an emergency lifting valve block; the vertical loading control valve block is used to control the loading condition of the system according to external functional instructions, thereby controlling the operation of the main loading hydraulic cylinder; the loading condition includes working condition, downward pressure loading condition and lifting loading condition; the emergency lifting valve block is used to store energy when the system is powered on, and is also used to lift and load the main loading hydraulic cylinder when an emergency occurs in the system; emergency situations include system power failure and system power outage, which solves the problem of poor stability and reliability of the existing hydraulic loading system. When the system is working, the hydraulic control oil circuit is controlled by the solenoid valve, and the hydraulic After the hydraulic control oil circuit is connected, the hydraulic control switch valve is opened. At this time, the loading solenoid valve is operated. Since the loading solenoid valve is a precision device, a single debugging oil circuit is set up for debugging when debugging the loading system. After the hydraulic control oil circuit is connected, the hydraulic control switch valve is opened, and then the debugging solenoid valve is operated. In addition, in order to prevent emergencies such as loss of control of loading or power outages, the system is equipped with an emergency protection oil circuit. When an emergency occurs, the emergency oil circuit automatically starts to protect the loading system, which can well solve the problems of loading stability and emergency protection of emergencies. Moreover, this type of system belongs to the hydraulic control structure, and its reliability is greatly enhanced, which is conducive to the use of hydraulic loading in test loading equipment, lifting, and forging environments, reducing the use and maintenance costs of the system.

[0088] Those skilled in the art will appreciate that all or part of the processes of the above-mentioned embodiments can be implemented by instructing related hardware through a computer program, and the program can be stored in a computer-readable storage medium, wherein the computer-readable storage medium is a disk, an optical disk, a read-only storage memory, or a random access memory, etc.

[0089] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by any technician familiar with the technical field within the technical scope disclosed by the present invention should be covered within the protection scope of the present invention.

Claims

1. A hydraulic loading and protection system, characterized in that: It includes main loading hydraulic cylinder, vertical loading control valve block and emergency lifting valve block; The vertical loading control valve block is used to control the loading condition of the system according to the external function instruction, and then control the operation of the main loading hydraulic cylinder; wherein the loading condition includes the working condition, the downward pressure loading condition and the lifting loading condition; The emergency lifting valve block is used to store energy when the system is powered on; it is also used to control the lifting and loading of the main loading hydraulic cylinder when an emergency occurs in the system; wherein the emergency includes system power failure and system power outage.

2. The hydraulic loading and protection system according to claim 1, characterized in that: The oil inlet and oil return port of the vertical loading control valve block are respectively connected to the oil inlet and oil return port of the loading pump source; the first working oil port and the second working oil port of the vertical loading control valve block are respectively connected to the rodless chamber and the rod chamber of the main loading hydraulic cylinder; the emergency oil port of the vertical loading control valve block is connected to the oil inlet of the emergency lifting valve block; The working oil port of the emergency lifting valve block is communicated with the rod chamber of the main loading hydraulic cylinder; the oil return port of the emergency lifting valve block is communicated with the oil return port of the loading pump source.

3. The hydraulic loading and protection system according to claim 2, characterized in that: The loading condition in the vertical loading control valve block also includes a debugging condition; the system also includes a debugging valve block; The debugging valve block is used to control the debugging working condition of the system according to the received debugging instructions when the system is in the debugging working condition, thereby controlling the operation of the main loading hydraulic cylinder; wherein the adjustment working condition includes debugging the pressing loading working condition and debugging the lifting loading working condition; The first working oil port and the second working oil port of the debugging valve block are respectively connected to the rodless chamber and the rod chamber of the main loading hydraulic cylinder; the oil inlet of the debugging valve block is connected to the emergency oil port of the vertical loading control valve block; the oil return port of the debugging valve block is connected to the oil return port of the loading pump source.

4. The hydraulic loading and protection system according to claim 2, characterized in that: The vertical loading control valve block comprises a filter (1), a first three-position four-way solenoid valve (2), a first one-way two-position two-way hydraulic control valve (31), a second one-way two-position two-way hydraulic control valve (32), a third one-way two-position two-way hydraulic control valve (4), a three-position three-way solenoid valve (6), a third adjustable one-way throttle valve (5), a first overflow valve (71) and a second overflow valve (72); The oil inlet of the filter (1) serves as the oil inlet of the vertical loading control valve block, and the oil outlet is connected to the oil inlet of the first three-position four-way solenoid valve (2); the oil return port of the first three-position four-way solenoid valve (2) is connected to the oil return port of the loading pump source; The A working oil port of the first three-position four-way solenoid valve (2) is connected to the oil inlet of the first one-way two-position two-way hydraulic control valve (31), and the B working oil port is connected to the oil inlet of the second one-way two-position two-way hydraulic control valve (32); The working oil ports of the first one-way two-position two-way hydraulic control valve (31) and the second one-way two-position two-way hydraulic control valve (32) serve as the first working oil port and the second working oil port of the vertical loading control valve block respectively; the control oil inlet of the first one-way two-position two-way hydraulic control valve (31) is connected to the control oil inlet of the second one-way two-position two-way hydraulic control valve (32); the control oil outlet of the first one-way two-position two-way hydraulic control valve (31) and the control oil outlet of the second one-way two-position two-way hydraulic control valve (32) are connected to the oil return port of the first three-position four-way solenoid valve (2); The oil inlet of the three-position three-way solenoid valve (6) is communicated with the oil return port of the first three-position four-way solenoid valve (2), the working oil port is communicated with the control oil inlet of the first one-way two-position two-way hydraulic control valve (31), the oil return port is communicated with the oil inlet of the first three-position four-way solenoid valve (2), and serves as an emergency oil port of the vertical loading control valve block; The oil inlet of the third adjustable one-way throttle valve (5) is connected to the oil return port of the first three-position four-way solenoid valve (2), and the oil outlet is connected to the oil inlet of the third one-way two-position two-way hydraulic control valve (4); the working oil port of the third one-way two-position two-way hydraulic control valve (4) is connected to the working oil port of the first one-way two-position two-way hydraulic control valve (31), the control oil outlet is connected to the oil return port of the first three-position four-way solenoid valve (2), and the control oil inlet is connected to the working oil port of the three-position three-way solenoid valve (6); The oil inlet of the first overflow valve (71) is connected to the oil return port of the first three-position four-way solenoid valve (2), and the oil drain port is connected to the working oil port of the first one-way two-position two-way hydraulic control valve (31); the oil inlet of the second overflow valve (72) is connected to the oil return port of the first three-position four-way solenoid valve (2), and the oil drain port is connected to the working oil port of the second one-way two-position two-way hydraulic control valve (32).

5. The hydraulic loading and protection system according to claim 2, characterized in that: The emergency lift valve block comprises a first stop valve (12), a second stop valve (14), an accumulator (13), a first one-way two-position two-way solenoid valve (11), and a second one-way two-position two-way solenoid valve (15); The oil inlet of the second one-way two-position two-way solenoid valve (15) serves as the oil inlet of the emergency lift valve block, and the working oil port is communicated with the oil inlet of the first stop valve (12); the oil outlet of the first stop valve (12) is communicated with the oil inlet of the accumulator (13); The oil inlet of the first one-way two-position two-way solenoid valve (11) is connected to the oil inlet of the first stop valve (12), and the working oil port serves as the working oil port of the emergency lifting valve block; The oil inlet end of the second stop valve (14) is communicated with the oil inlet port of the first stop valve (12), and the oil outlet end serves as the oil return port of the emergency lift valve block.

6. The hydraulic loading and protection system according to claim 3, characterized in that: The debugging valve block comprises a second three-position four-way solenoid valve (8), a first adjustable one-way throttle valve (91), a second adjustable one-way throttle valve (92), a first hydraulically controlled one-way valve (101) and a second hydraulically controlled one-way valve (102); The oil inlet and the oil outlet of the second three-position four-way solenoid valve (8) serve as the oil inlet and the oil return port of the debugging valve block respectively; the working oil port A of the second three-position four-way solenoid valve (8) is connected to the oil inlet of the first adjustable one-way throttle valve (91); the working oil port B of the second three-position four-way solenoid valve (8) is connected to the oil inlet of the second adjustable one-way throttle valve (92); The oil outlet of the first adjustable one-way throttle valve (91) is communicated with the oil inlet of the first hydraulically controlled one-way valve (101); the oil outlet of the first hydraulically controlled one-way valve (101) serves as the first working oil port of the debugging valve block, and the control oil port is communicated with the oil inlet of the second hydraulically controlled one-way valve (102); The oil outlet of the second adjustable one-way throttle valve (92) is connected to the oil inlet of the second hydraulically controlled one-way valve (102); the oil outlet of the second hydraulically controlled one-way valve (102) serves as the second working oil port of the debugging valve block, and the control oil port is connected to the oil inlet of the first hydraulically controlled one-way valve (101).

7. The hydraulic loading and protection system according to claim 4, characterized in that: The middle position of the first three-position four-way solenoid valve (2) is O-type, the springs of the first one-way two-position two-way hydraulic control valve (31) and the second one-way two-position two-way hydraulic control valve (32) are in the normally open position; the spring of the third one-way two-position two-way hydraulic control valve (4) is in the normally closed position; The middle position of the three-position three-way solenoid valve (6) is a low-pressure oil circuit state, and the left position is a vertical loading control oil circuit connection state; wherein the low-pressure oil circuit state is that the oil inlet is connected to the working oil port and the oil return port is closed, and the vertical loading control oil circuit connection state is that the oil return port is connected to the working oil port and the oil inlet is closed.

8. The hydraulic loading and protection system according to claim 5, characterized in that: The spring of the first one-way two-position two-way solenoid valve (11) is in a normally closed position, and the spring of the second one-way two-position two-way solenoid valve (15) is in a normally open position; the first stop valve (12) is in a connected state when the power is off, and the second stop valve (14) is in a cut-off state when the power is off.

9. The hydraulic loading and protection system according to claim 6, characterized in that: The middle position of the second three-position four-way solenoid valve (8) is Y-shaped.

10. The hydraulic loading and protection system according to claim 4, characterized in that: The third adjustable one-way throttle valve (5) is provided with a backup power supply.

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