Hydraulic Synchronization Device Protection Circuit and Hydraulic Synchronization Device

Abstract

The present invention discloses a protection circuit for a hydraulic synchronization device, and also discloses a hydraulic synchronization device having the protection circuit for the hydraulic synchronization device. The protection circuit for the hydraulic synchronization device includes a detection signal processing module, a comparison module, and a switch control module. The detection signal processing module has a first detection signal input terminal and a second detection signal input terminal. The comparison module has a calibration value signal input terminal. The comparison module is electrically connected to the output terminal of the detection signal processing module. The switch control module has an external control signal input terminal. The switch control module is electrically connected to the output terminal of the comparison module. The switch control module outputs a switch signal for a hydraulic valve. The protection circuit for the hydraulic synchronization device of the present invention collects the state information of hydraulic cylinders in different paths of the hydraulic synchronization device, processes and compares it. When the synchronization of the hydraulic cylinders between different paths exceeds the limit, the operation of the hydraulic valve is stopped to prevent the load driven by the hydraulic synchronization device from being damaged.

Description

Technical Field

[0001] The present invention relates to the technical field of synchronization devices, and particularly relates to a protection circuit for a hydraulic synchronization device and a hydraulic synchronization device. Background Art

[0002] Hydraulic synchronization devices are often used to drive large loads or large eccentric loads. In a hydraulic synchronization device, the oil inlet volume of multiple hydraulic cylinders is controlled through components such as multiple hydraulic valves, and multiple hydraulic cylinders can be lifted / lowered synchronously. In the prior art, a hydraulic synchronization device usually electrically connects a position sensor to a hydraulic cylinder, detects the position of the hydraulic cylinder, and outputs the detected position data to a controller. The controller can adjust the corresponding hydraulic valves according to the position data of each hydraulic cylinder so that each hydraulic cylinder maintains synchronous driving. However, the synchronization efficiency of such a hydraulic synchronization device is affected by the control system inside the controller. In actual use, it is easy to cause an imbalance in the output drive between multiple hydraulic cylinders due to reasons such as cumulative deviation of the control system or the control system getting stuck, resulting in synchronization failure. After the synchronization fails, the controller cannot detect and stop the hydraulic cylinders in time, leading to inconsistent forces on each support point of the load driven by the hydraulic synchronization device and causing damage. Summary of the Invention

[0003] The present invention aims to at least solve one of the technical problems existing in the prior art. For this purpose, the present invention provides a protection circuit for a hydraulic synchronization device, which can stop the hydraulic cylinders in time when the hydraulic synchronization device fails to synchronize, preventing damage to the load driven by the hydraulic synchronization device.

[0004] The present invention also discloses a hydraulic synchronization device having the above protection circuit for a hydraulic synchronization device.

[0005] According to an embodiment of the first aspect of the present invention, the protection circuit for a hydraulic synchronization device includes: a detection signal processing module, which has a first detection signal input end and a second detection signal input end; a comparison module, which has a calibration value signal input end, and the comparison module is electrically connected to the output end of the detection signal processing module; a switch control module, which has an external control signal input end, the switch control module is electrically connected to the output end of the comparison module, and the switch control module outputs a switch signal for a hydraulic valve.

[0006] The hydraulic synchronization device protection circuit according to the embodiments of the present invention has at least the following beneficial effects: The first and second detection signal input ends of the detection signal processing module are respectively electrically connected to the detection components of different circuits of the hydraulic synchronization device. The detection components detect the corresponding states of the hydraulic cylinders. The detection signal processing module receives the electrical signals output by the corresponding detection components, processes the electrical signals to obtain the signals to be compared, and the signals to be compared are used to reflect the synchronization effect between different circuits of the hydraulic device. The signals to be compared are output to the comparison module. The comparison module has a calibrated value signal input end. When the signal to be compared is greater than the calibrated value signal, it indicates that the synchronization effect between different circuits of the hydraulic device exceeds the limit. The comparison module outputs an electrical signal indicating that the synchronization effect exceeds the limit to the switch control module. The switch control module thereby outputs a hydraulic valve closing signal to stop the operation of the hydraulic valve and prevent the load driven by the hydraulic synchronization device from being damaged.

[0007] According to some embodiments of the present invention, it further includes a signal shielding module electrically connected between the comparison module and the switch control module. The signal shielding module has a fault clearing signal input end.

[0008] By providing a signal shielding module between the comparison module and the switch control module, when an electrical signal is input to the fault clearing signal input end, the signal shielding module will shield the electrical signal output by the comparison module, avoiding the comparison module continuously outputting electrical signals to the switch control module when the synchronization effect exceeds the limit, resulting in the hydraulic valve being continuously locked. Through the electrical signals input by the signal shielding module and the external control signal input end, the switch control module can output a hydraulic valve opening signal to facilitate the flow rate adjustment of the hydraulic valve and restore the synchronization effect between the hydraulic cylinders of different circuits to normal.

[0009] According to some embodiments of the present invention, the signal shielding module includes: a timing trigger, the input end of the timing trigger is the fault clearing signal input end; an OR gate, the first input end of the OR gate is electrically connected to the timing trigger, the second input end of the OR gate is electrically connected to the comparison module, and the output end of the OR gate is electrically connected to the switch control module.

[0010] The timing trigger is used to limit the time for adjusting the flow rate of the hydraulic valve. If the synchronization of the hydraulic valve has not been completed after exceeding the time limit of the timing trigger, the signal shielding fails, and the electrical signal output by the comparison module is output to the switch control module through the OR gate. The switch module thereby outputs a hydraulic valve closing signal to lock the hydraulic valve again.

[0011] According to some embodiments of the present invention, the comparison module includes: a comparator, a first input end and a second input end of the comparator are electrically connected to an output end of the detection signal processing module respectively, a third input end of the comparator is the calibration value signal input end, and the comparator compares an electrical signal output by the detection signal processing module and an electrical signal input by the calibration value signal input end; a NOT gate, the NOT gate is electrically connected between the comparator and the signal shielding module.

[0012] The comparator compares the electrical signal output by the detection signal processing module with the calibration value signal. If the electrical signal output by the detection signal processing module is greater than the calibration value signal, it indicates that the synchronization effect between the hydraulic valves is out of limit. The comparator outputs a low level through the NOT gate. When no electrical signal is input at the fault clearing signal input end, this low level signal causes the switch control module to output a hydraulic valve closing signal to control the hydraulic valve to close.

[0013] According to some embodiments of the present invention, the switch control module includes an AND gate, a first input end of the AND gate is electrically connected to the signal shielding module, a second input end of the AND gate is the external control signal input end, and the AND gate outputs the switch signal of the hydraulic valve.

[0014] The AND gate performs a logical "AND" operation on the electrical signal output by the signal shielding module and the external control signal. If both are high levels, the hydraulic valve is opened, otherwise the hydraulic valve is closed.

[0015] According to some embodiments of the present invention, the detection signal processing module includes: a positive difference calculator, a first input end of the positive difference calculator is the first detection signal input end, a second input end of the positive difference calculator is the second detection signal input end, and an output end of the positive difference calculator is electrically connected to the comparison module; a negative difference calculator, a first input end of the negative difference calculator is the first detection signal input end, a second input end of the negative difference calculator is the second detection signal input end, and an output end of the negative difference calculator is electrically connected to the comparison module.

[0016] The positive difference calculator subtracts the second detection signal from the first detection signal and outputs the result to the comparison module. The negative difference calculator subtracts the first detection signal from the second detection signal and outputs the result to the comparison module. At the same time, performing positive difference operation and negative difference operation on the first detection signal and the second detection signal can obtain the absolute value of the difference between the first detection signal and the second detection signal, which is convenient for comparison with the calibration value.

[0017] According to some embodiments of the present invention, the comparison module includes: a comparator, wherein the first input terminal and the second input terminal of the comparator are electrically connected to the output terminal of the detection signal processing module respectively, the third input terminal of the comparator is the calibration value signal input terminal, and the comparator compares the electrical signal output by the detection signal processing module with the electrical signal input by the calibration value signal input terminal; and a NOT gate, wherein the NOT gate is electrically connected between the comparator and the switch control module.

[0018] The comparator compares the electrical signal output by the detection signal processing module with the calibration value signal. If the electrical signal output by the detection signal processing module is greater than the calibration value signal, it means that the synchronization effect between the hydraulic valves exceeds the limit. The comparator outputs a low level through the NOT gate, causing the switch control module to output a hydraulic valve closing signal to control the hydraulic valve to close.

[0019] According to some embodiments of the present invention, the switch control module includes an AND gate, a first input terminal of the AND gate is electrically connected to the comparison module, a second input terminal of the AND gate is connected to the external control signal input terminal, and the AND gate outputs a switch signal of the hydraulic valve.

[0020] The AND gate performs a logic "AND" operation on the electrical signal output by the comparison module and the external control signal. If both are high level, the hydraulic valve is opened, otherwise the hydraulic valve is closed.

[0021] The hydraulic synchronization device according to the second aspect of the present invention comprises the hydraulic synchronization device protection circuit of the first aspect.

[0022] The hydraulic synchronization device according to the embodiment of the present invention has at least the following beneficial effects: by setting the protection circuit, the hydraulic synchronization device is prevented from continuing to operate after synchronization failure, resulting in inconsistent force on the support points of the load driven by the hydraulic synchronization device and damage.

[0023] According to some embodiments of the present invention, a hydraulic structure is further included, wherein the hydraulic structure has a first lifting component and a second lifting component, wherein the first lifting component includes a first hydraulic cylinder, a first hydraulic valve transmission-connected to the first hydraulic cylinder, and a first detection component electrically connected to the first hydraulic cylinder, wherein the first detection component is electrically connected to the first detection signal input terminal, and the second lifting component includes a second hydraulic cylinder, a second hydraulic valve transmission-connected to the second hydraulic cylinder, and a second detection component electrically connected to the second hydraulic cylinder, wherein the second detection component is electrically connected to the second detection signal input terminal, and the output terminal of the switch control module is electrically connected to the first hydraulic valve and the second hydraulic valve, respectively.

[0024] Additional aspects and advantages of the present invention will be given in part in the following description, become apparent in part from the following description, or be learned through the practice of the present invention. Description of the Drawings

[0025] The above and / or additional aspects and advantages of the present invention will become apparent and be readily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0026] Figure 1 is a schematic block diagram of a protection circuit for a hydraulic synchronization device according to an embodiment of the present invention;

[0027] Figure 2 is a schematic diagram of a hydraulic protection device according to an embodiment of the present invention;

[0028] Figure 3 is a schematic block diagram of a protection circuit for a hydraulic synchronization device according to another embodiment of the present invention.

[0029] Reference Signs:

[0030] Detection signal processing module 100, positive difference calculator 110, negative difference calculator 120;

[0031] Comparison module 200, comparator 210, NOT gate 220;

[0032] Switch control module 300, AND gate 310;

[0033] Signal shielding module 400, timing flip-flop 410, OR gate 420. Detailed Description of the Embodiments

[0034] Embodiments of the present invention will be described in detail below. Examples of the embodiments are shown in the drawings, in which the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the drawings are exemplary only for explaining the present invention and should not be construed as limiting the present invention.

[0035] In the description of the present invention, the meaning of "a plurality of" is two or more. If the first and second are described, it is only for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features or implicitly indicating the sequence of the indicated technical features.

[0036] In the description of the present invention, unless otherwise clearly defined, terms such as "set", "installed", and "connected" should be understood in a broad sense. Those skilled in the art can reasonably determine the specific meanings of the above terms in the present invention in combination with the specific content of the technical solution.

[0037] Refer to Figure 1, the hydraulic synchronization device protection circuit according to the embodiment of the first aspect of the present invention includes a detection signal processing module 100, a comparison module 200, and a switch control module 300.

[0038] Among them, the detection signal processing module 100 has a first detection signal input terminal and a second detection signal input terminal. The comparison module 200 has a calibration value signal input terminal. The comparison module 200 is electrically connected to the output terminal of the detection signal processing module 100. The switch control module 300 has an external control signal input terminal. The switch control module 300 is electrically connected to the output terminal of the comparison module 200. The switch control module 300 outputs a switch signal of the hydraulic valve.

[0039] The first detection signal input terminal and the second detection signal input terminal of the detection signal processing module 100 are respectively electrically connected to the detection components of different paths of the hydraulic synchronization device. The detection components detect the working state of the hydraulic cylinder. The detection signal processing module 100 receives the electrical signals output by the corresponding detection components, and processes the electrical signals to obtain a signal to be compared. The signal to be compared is used to reflect the synchronization effect between different paths of the hydraulic device. The signal to be compared is output to the comparison module 200. The comparison module 200 has a calibration value signal input terminal. When the signal to be compared is greater than the calibration value signal, it indicates that the synchronization effect between different paths of the hydraulic synchronization device exceeds the limit. The comparison module 200 outputs an electrical signal indicating that the synchronization effect exceeds the limit to the switch control module 300. The switch control module 300 thereby outputs a hydraulic valve closing signal to stop the operation of the hydraulic valve and prevent the load driven by the hydraulic synchronization device from being damaged.

[0040] It is worth mentioning that the detection components can be common position sensors or pressure sensors in the hydraulic synchronization device. The position sensor can detect the position information of the hydraulic cylinder, and the pressure sensor can detect the pressure information of the hydraulic cylinder. When the detection component is a position sensor, the position sensors of different paths send the position information of the hydraulic cylinder they detect to the first detection signal input terminal and the second detection signal input terminal respectively. The detection signal processing module 100 processes the position information of different paths and sends it to the comparison module 200. The calibration value signal can be formulated according to the relationship between the torque received by the load driven by the hydraulic synchronization protection device and the position deviation of the hydraulic cylinders of different paths. The external control signal input terminal can be electrically connected to the controller of the hydraulic synchronization protection device to receive the control signal of the controller.

[0041] Similarly, when the detection component is a pressure sensor, the pressure sensors of different channels send the pressure information of the hydraulic cylinder detected by each of them to the first detection signal input end and the second detection signal input end. The detection signal processing module 100 processes the pressure information of different channels and sends it to the comparison module 200. The calibration value signal can be formulated according to the relationship between the torque received by the load driven by the hydraulic synchronization protection device and the pressure deviation of the hydraulic cylinders of different channels. The external control signal input end can be electrically connected to the controller of the hydraulic synchronization protection device to receive the control signal of the controller.

[0042] It can be conceived that the detection signal processing module 100 includes a positive difference calculator 110 and a negative difference calculator 120. The first input end of the positive difference calculator 110 is the first detection signal input end, the second input end of the positive difference calculator 110 is the second detection signal input end, and the output end of the positive difference calculator 110 is electrically connected to the comparison module 200. The first input end of the negative difference calculator 120 is the first detection signal input end, the second input end of the negative difference calculator 120 is the second detection signal input end, and the output end of the negative difference calculator 120 is electrically connected to the comparison module 200.

[0043] The positive difference calculator 110 subtracts the second detection signal from the first detection signal and outputs the result to the comparison module 200. The negative difference calculator 120 subtracts the first detection signal from the second detection signal and outputs the result to the comparison module 200. By performing positive difference operation and negative difference operation on the first detection signal and the second detection signal simultaneously, the absolute value of the difference between the first detection signal and the second detection signal can be obtained. The absolute value of the difference between the first detection signal and the second detection signal can intuitively show the working state of the hydraulic cylinders between different channels, which is convenient for comparison with the calibration value.

[0044] It is worth mentioning that both the positive difference calculator 110 and the negative difference calculator 120 can be implemented by a subtractor. The specific circuit design of the subtractor is common knowledge for those skilled in the art and will not be elaborated here.

[0045] It can be conceived that the comparison module 200 includes a comparator 210 and a NOT gate 220. The first input end and the second input end of the comparator 210 are respectively electrically connected to the output end of the detection signal processing module 100. The third input end of the comparator 210 is the calibration value signal input end. The comparator 210 compares the electrical signal output by the detection signal processing module 100 and the electrical signal input by the calibration value signal input end. The NOT gate 220 is electrically connected between the comparator 210 and the switch control module 300.

[0046] Comparator 210 compares the electrical signal output by the detection signal processing module 100 with the calibration value signal. If the electrical signal output by the detection signal processing module 100 is greater than the calibration value signal, it indicates that the synchronization effect between the hydraulic valves is out of limit. Comparator 210 outputs a low level through NOT gate 220, causing the switch control module 300 to output a hydraulic valve closing signal to control the closing of the hydraulic valve.

[0047] It is worth mentioning that the specific circuit designs of comparator 210 and NOT gate 220 are well-known attempts for those skilled in the art and will not be elaborated here.

[0048] It can be conceived that the switch control module 300 includes an AND gate 310. The first input terminal of the AND gate 310 is electrically connected to the comparison module 200, the second input terminal of the AND gate 310 is an external control signal input terminal, and the AND gate 310 outputs the switch signal of the hydraulic valve.

[0049] The AND gate 310 performs a logical "AND" operation on the electrical signal output by the comparison module 200 and the external control signal. If both are high levels, the hydraulic valve opens; otherwise, the hydraulic valve closes. Among them, the external control signal input terminal can be electrically connected to the controller of the hydraulic synchronization device to receive the control signal of the controller for the hydraulic valve. Among them, the control signal of the controller for the hydraulic valve is a high level signal or a low level signal. The high level signal is used to control the opening of the hydraulic valve, and the low level signal is used to control the closing of the hydraulic valve.

[0050] Specifically, when the signal to be compared is greater than the calibration value signal, the comparison module 200 outputs a low level, indicating that the synchronization effect between different circuits of the hydraulic synchronization device is out of limit. At this time, regardless of whether the controller outputs a high level signal or a low level signal, the AND gate 310 outputs a low level signal to control the closing of the hydraulic valve, making this protection circuit have a high priority and still being able to control the hydraulic valve when the controller fails; when the controller outputs a low level signal, regardless of whether the comparison module 200 outputs a high level signal or a low level signal, the AND gate 310 outputs a low level signal to control the closing of the hydraulic valve; only when the signal to be compared is less than the calibration value signal and the controller outputs a high level signal, the AND gate 310 outputs a high level signal to control the opening of the hydraulic valve. Through the dual control method, the failure risk of the controller or the protection circuit can be effectively reduced. When one of the controller or the protection circuit fails, the other can continue to detect and control the working state of the hydraulic cylinder, effectively avoiding damage to the load driven by the hydraulic cylinder.

[0051] Refer to Figure 3 As shown, based on the above embodiment, the protection circuit of the hydraulic synchronization device according to another embodiment of the present invention further includes a signal shielding module 400 electrically connected between the comparison module 200 and the switch control module 300, and the signal shielding module 400 has a fault clearing signal input terminal.

[0052] The signal shielding module 400 is used to shield the electrical signal output by the comparison module 200. By setting the signal shielding module 400 between the comparison module 200 and the switch control module 300, when an electrical signal is input at the fault clearing signal input terminal, the signal shielding module 400 will shield the electrical signal output by the comparison module 200, avoiding the comparison module 200 continuously outputting electrical signals to the switch control module 300 when the synchronization effect exceeds the limit, resulting in the hydraulic valve being locked all the time; through the signal shielding module 400 and the electrical signal input at the external control signal input terminal, the switch control module 300 can output a hydraulic valve opening signal, facilitating the flow regulation of the hydraulic valve and restoring the normal synchronization effect between different cylinders.

[0053] For example, if the comparison module 200 outputs a low-level signal when the synchronization effect exceeds the limit, when an electrical signal is input at the fault clearing signal input terminal, the signal shielding module 400 will output a high-level signal, thereby shielding the low-level signal output by the comparison module 200. The signal shielding module 400 outputs a high-level signal to the switch control module 300. When a high-level signal is also input at the external control signal input terminal, the switch control module 300 outputs a hydraulic valve opening signal, enabling the hydraulic valve to be temporarily opened when the synchronization effect between different cylinders exceeds the limit. The controller of the hydraulic synchronization device can regulate the flow of the hydraulic valve to restore the synchronization effect between different cylinders within the range.

[0054] It can be conceived that the signal shielding module 400 includes a timing trigger 410 and an OR gate 420. The input terminal of the timing trigger 410 is the fault clearing signal input terminal. The first input terminal of the OR gate 420 is electrically connected to the timing trigger 410. The second input terminal of the OR gate 420 is electrically connected to the comparison module 200. The output terminal of the OR gate 420 is electrically connected to the switch control module 300.

[0055] When the input terminal of the timing trigger 410 receives an electrical signal, the timing trigger 410 outputs a high-level signal to the OR gate 420 within a certain time, so that regardless of what electrical signal the comparison module 200 outputs, the OR gate 420 will output a high-level signal, thereby realizing the shielding of the synchronization effect over-limit signal. The high-level signal output by the OR gate 420 can cooperate with the electrical signal input at the external control signal input terminal to temporarily open the hydraulic valve. The controller of the hydraulic synchronization device can adjust the flow of the flow valve to restore the synchronization effect between different cylinders within the range.

[0056] Specifically, when both the OR gate 420 and the external control signal input terminal output high-level signals to the switch control module 300, the switch control module 300 outputs a hydraulic valve opening signal; otherwise, the switch control module 300 outputs a closing signal to the hydraulic valve.

[0057] The timing trigger 410 is used to limit the time for flow regulation of the hydraulic valve. If the synchronization of the hydraulic valve has not been completed after exceeding the time limit of the timing trigger 410, the signal shielding fails, and the electrical signal output by the comparison module 200 is output to the switch control module 300 through the OR gate 420. The switch module thus outputs a hydraulic valve closing signal to re-lock the hydraulic valve. By limiting the time for flow regulation of the hydraulic valve, it is possible to prevent the load torsional force driven by the hydraulic synchronization device from deteriorating further.

[0058] It can be conceived that the comparison module 200 includes a comparator 210 and a NOT gate 220. The first input terminal and the second input terminal of the comparator 210 are electrically connected to the output terminal of the detection signal processing module 100 respectively. The third input terminal of the comparator 210 is a calibration value signal input terminal. The comparator 210 compares the electrical signal output by the detection signal processing module 100 and the electrical signal input from the calibration value signal input terminal. The NOT gate 220 is electrically connected between the comparator 210 and the signal shielding module 400.

[0059] The comparator 210 compares the electrical signal output by the detection signal processing module 100 with the calibration value signal. If the electrical signal output by the detection signal processing module 100 is greater than the calibration value signal, it indicates that the synchronization effect between the hydraulic valves is exceeded. The comparator 210 outputs a low level through the NOT gate 220. When there is no electrical signal input at the fault clearing signal input terminal, this low level signal causes the switch control module 300 to output a hydraulic valve closing signal to control the hydraulic valve to close.

[0060] It can be conceived that the switch control module 300 includes an AND gate 310. The first input terminal of the AND gate 310 is electrically connected to the signal shielding module 400. The second input terminal of the AND gate 310 is an external control signal input terminal. The AND gate 310 outputs a switch signal of the hydraulic valve.

[0061] The AND gate 310 performs a logical "AND" operation on the electrical signal output by the signal shielding module 400 and the external control signal. If both are high levels, the hydraulic valve is opened; otherwise, the hydraulic valve is closed.

[0062] The hydraulic synchronization device according to the second aspect embodiment of the present invention includes the hydraulic synchronization device protection circuit of the first aspect embodiment above.

[0063] The hydraulic synchronization device according to the second aspect embodiment of the present invention can prevent the hydraulic synchronization device from continuing to operate after synchronization failure by setting up a protection circuit, which may cause damage due to inconsistent forces on each support point of the load driven by the hydraulic synchronization device.

[0064] It can be conceived that, such as Figure 2As shown, the hydraulic synchronization device also includes a hydraulic structure, the hydraulic structure has a first lifting component and a second lifting component, the first lifting component includes a first hydraulic cylinder, a first hydraulic valve transmission-connected to the first hydraulic cylinder, and a first detection component electrically connected to the first hydraulic cylinder, the first detection component is electrically connected to the first detection signal input terminal, the second lifting component includes a second hydraulic cylinder, a second hydraulic valve transmission-connected to the second hydraulic cylinder, and a second detection component electrically connected to the second hydraulic cylinder, the second detection component is electrically connected to the second detection signal input terminal, and the output end of the switch control module 300 is electrically connected to the first hydraulic valve and the second hydraulic valve, respectively.

[0065] The first lifting assembly and the second lifting assembly are different paths of the hydraulic synchronization device. The first detection member is connected to the first hydraulic cylinder, and is used to detect the working state of the first hydraulic cylinder and send it to the first detection signal input terminal. The second detection member is connected to the second hydraulic rod, and is used to detect the working state of the second hydraulic rod and send it to the second detection signal input terminal. The first hydraulic valve and the second hydraulic valve are respectively electrically connected to the output terminal of the switch control module 300, and are controlled by the switch control module 300. Through such a setting, the protection circuit of the hydraulic synchronization device can receive the electrical signals of the first detection member and the second detection member, and control the first hydraulic valve and the second hydraulic valve through the detection signal, so as to prevent the hydraulic synchronization device from continuing to operate after the synchronization fails, resulting in inconsistent force on each support point of the load driven by the hydraulic synchronization device and damage.

[0066] It is worth mentioning that the hydraulic synchronization device also includes a controller, and the controller can be electrically connected to the external control signal input terminal. In addition, a stroke limit can be set for each hydraulic cylinder to achieve stroke limit protection for the hydraulic cylinder, and a signal shielding module can also be used to shield the stroke limit signal. In addition, the first hydraulic valve and the second hydraulic valve mentioned above can both be proportional reversing valves. In addition, the number of detection signal processing modules 100 can be multiple, so as to realize the detection of three-way, four-way, five-way and other multi-way hydraulic synchronization devices. The solution of the embodiment of the present invention is applicable to multi-way hydraulic synchronization devices.

[0067] The embodiments of the present invention are described in detail above with reference to the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge scope of ordinary technicians in the relevant technical field without departing from the purpose of the present invention.

Claims

1. A protection circuit for a hydraulic synchronization device, characterized in that, include: A detection signal processing module, wherein the detection signal processing module has a first detection signal input terminal and a second detection signal input terminal; A comparison module having a calibration value signal input terminal, wherein the comparison module is electrically connected to an output terminal of the detection signal processing module; A switch control module, wherein the switch control module has an external control signal input terminal, the switch control module is electrically connected to the output terminal of the comparison module, and the switch control module outputs a switch signal of the hydraulic valve; It also includes a signal shielding module electrically connected between the comparison module and the switch control module, and the signal shielding module has a fault clearing signal input terminal; The signal shielding module includes: a timing trigger, the input end of the timing trigger is the fault clearing signal input end; an OR gate, the first input end of the OR gate is electrically connected to the timing trigger, the second input end of the OR gate is electrically connected to the comparison module, and the output end of the OR gate is electrically connected to the switch control module; The comparison module includes: a comparator, wherein the first input terminal and the second input terminal of the comparator are electrically connected to the output terminal of the detection signal processing module respectively, the third input terminal of the comparator is the calibration value signal input terminal, and the comparator compares the electrical signal output by the detection signal processing module with the electrical signal input by the calibration value signal input terminal; and a NOT gate, wherein the NOT gate is electrically connected between the comparator and the signal shielding module.

2. The hydraulic synchronization device protection circuit according to claim 1, wherein, The switch control module includes an AND gate, a first input end of the AND gate is electrically connected to the signal shielding module, a second input end of the AND gate is the external control signal input end, and the AND gate outputs a switch signal of the hydraulic valve.

3. The hydraulic synchronization device protection circuit according to any one of claims 1-2, characterized in that, The detection signal processing module comprises: A positive difference operator, wherein the first input end of the positive difference operator is the first detection signal input end, the second input end of the positive difference operator is the second detection signal input end, and the output end of the positive difference operator is electrically connected to the comparison module; A contrast operator, wherein the first input end of the contrast operator is the first detection signal input end, the second input end of the contrast operator is the second detection signal input end, and the output end of the contrast operator is electrically connected to the comparison module.

4. A hydraulic synchronization device, characterized in that, It comprises a hydraulic synchronization device protection circuit according to any one of claims 1-3.

5. The hydraulic synchronization device according to claim 4, characterized in that: It also includes a hydraulic structure, which has a first lifting component and a second lifting component, the first lifting component includes a first hydraulic cylinder, a first hydraulic valve transmission-connected to the first hydraulic cylinder, and a first detection component electrically connected to the first hydraulic cylinder, the first detection component is electrically connected to the first detection signal input terminal, the second lifting component includes a second hydraulic cylinder, a second hydraulic valve transmission-connected to the second hydraulic cylinder, and a second detection component electrically connected to the second hydraulic cylinder, the second detection component is electrically connected to the second detection signal input terminal, and the output terminal of the switch control module is electrically connected to the first hydraulic valve and the second hydraulic valve, respectively.

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