A control system for detecting the rupture of the bladder of a bladder accumulator

Abstract

The present invention belongs to the field of hydraulic control detection, and relates to a control system for detecting the rupture of the bladder of a bladder accumulator, which includes a bladder rupture detection device, a control valve integration unit, and a control unit; the control valve integration unit integrates a cut-off valve, a relief valve, and a pressure detection element; when the pressure of the main pressure oil circuit of the hydraulic system is abnormal, the control unit switches from the normal working mode to the accumulator detection mode and sends a control signal to the control valve integration unit; the bladder rupture detection device collects the bladder expansion state signal of the accumulator and the oil pressure signal of the oil outlet pipeline of the bladder accumulator collected by the pressure detection element and returns them to the control unit together, and the oil pressure signal is compared with the pre-charged air pressure; the control unit performs logical calculation based on the signals to judge whether the bladder is ruptured. This system is integrated into the hydraulic system and can quickly and accurately assist in judging whether it is caused by the rupture of the bladder when the system pressure is abnormal, so as to more quickly eliminate the fault and enable the hydraulic system to resume normal operation as soon as possible.

Description

Technical Field

[0001] The present invention belongs to the field of hydraulic control detection, and relates to a control system for detecting the rupture of the bladder of a bladder accumulator. Background Art

[0002] As an indispensable component in modern fluid hydraulic technology, the bladder accumulator can play roles such as storing hydraulic energy, absorbing pressure shocks, maintaining a constant pressure, buffering pressure pulsations through a bladder filled with pre-charged nitrogen, and compensating for flow fluctuations in a hydraulic system, and is widely used in every hydraulic system that requires safety and reliability.

[0003] The bladder accumulator belongs to a liquid-gas isolation type accumulator. The bladder is placed inside a closed steel pressure vessel, and it uses the compressibility of the gas inside the bladder to absorb or release pressure energy. The bladder accumulator includes a housing, a bladder, an inflation valve, an oil inlet valve (mushroom valve), and an oil valve body for installing the oil inlet valve. The inflation valve and the oil valve body are fixedly connected to the housing. The open end of the bladder is connected to the inflation valve. The oil inlet valve is installed inside the oil valve body and remains normally open under the action of an oil inlet valve spring to regulate the oil flow rate through the housing. When the bladder is fully expanded, the oil inlet valve moves downward to close the inlet, and at this time, it is in a fully depressurized state. Affected by factors such as the aging of its material, pressure fatigue, temperature change, and oil cleanliness, the rupture of the bladder is an inevitable event, and there is a large difference in individual service life; the rupture of the bladder will bring about the failure of the accumulator function of the hydraulic system, and the working condition of whether it is ruptured has problems of "invisibility, unpredictability, and difficulty in diagnosis", especially this is more prominent in a hydraulic system equipped with multiple accumulators.

[0004] The rupture of the bladder is only one of the reasons for the decrease in the air pressure inside the accumulator, and the decrease in the air pressure inside the accumulator does not necessarily mean that the bladder is ruptured. At present, the working state of the bladder of the bladder accumulator is mainly detected and judged manually by an inspector. The detection efficiency is low, and when a problem occurs, it cannot be confirmed immediately whether the problem is caused by the rupture of the bladder, and a fault diagnosis cannot be made in time, resulting in an impact on the integrity of the function of the hydraulic system, so that the entire hydraulic system cannot work continuously and normally. Summary of the Invention

[0005] In view of this, the purpose of the present invention is to provide a bladder breakage detection control system for a bladder accumulator, which is integrated into a hydraulic system. Under normal circumstances, the common functions of the bladder accumulator can be realized without affecting the use of the hydraulic system. When the internal pressure of the bladder accumulator is detected to be abnormal, it can quickly and accurately judge whether the bladder of the bladder accumulator is damaged, and then assist in determining whether the failure of the bladder accumulator is caused by bladder breakage, quickly eliminating a major cause of failure, thereby improving the overall efficiency of troubleshooting and enabling the hydraulic system to resume processing and production as soon as possible.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] A bladder breakage detection control system for a bladder accumulator, comprising a bladder accumulator, a bladder breakage detection device, a control valve integration unit, a pressure detection device and a control unit; the bladder breakage detection device and the control valve integration unit are respectively electrically connected to the control unit;

[0008] The pressure detection device collects the oil pressure of the oil outlet pipeline of the bladder accumulator and sends the oil pressure detection value to the control unit;

[0009] The control unit receives the oil pressure detection value and judges whether the oil pressure detection value is greater than a preset air pressure value. If the oil pressure detection value is less than the preset air pressure value, a control signal is sent to the control valve integration unit and the bladder breakage detection device;

[0010] The control valve integration unit is provided with a cut-off valve, a unloading valve and a pressure switch; the cut-off valve, the unloading valve and the pressure switch receive the control signal and switch their respective on-off states according to the control signal;

[0011] After receiving the control signal, the bladder breakage detection device collects the stroke data generated by the movement of the inlet valve of the bladder accumulator and sends the stroke data to the control unit; the bladder breakage detection device is also connected with an output unit, and the bladder breakage detection device also judges whether the bladder of the bladder accumulator has an expansion action according to the stroke data, and sends the judgment result to the output unit for output.

[0012] Further, when the stroke data is zero, the judgment result is OFF; when the stroke data is not zero, the judgment result is ON.

[0013] Further, the output unit includes a display device and an alarm device; the display device displays the judgment result; the alarm device gives an alarm when the judgment result is OFF.

[0014] Further, the cut-off valve includes a pilot valve and a main valve; the pressure detection device respectively detects the oil pressure values at the oil inlet and the oil outlet of the main valve, and sends the oil pressure values to the control unit; the control unit compares the oil pressure values and selects the port with the maximum oil pressure value as the control oil port. This solution can maximize the reliability of the main valve closing.

[0015] Further, the control unit is provided with an accumulator bladder detection mode; in the accumulator bladder detection mode, the electrical interlock relationship among the cut-off valve, the unloading valve, and the pressure switch is: the cut-off valve is disconnected, the unloading valve is disconnected, and the pressure switch is connected. This solution enables electrical interlocks among the valves, thus quickly entering the maintenance state, stopping the operation of the hydraulic system, and improving the detection efficiency.

[0016] Further, the control unit is provided with an accumulator normal working mode; in the accumulator normal working mode, the electrical interlock relationship among the cut-off valve, the unloading valve, and the pressure switch is: the cut-off valve is connected, the unloading valve is connected, and the pressure switch is disconnected. This solution can quickly control the hydraulic system to return to the normal working state, and when used in conjunction with the accumulator bladder detection mode, it can verify the maintenance results during maintenance, confirm whether the fault is eliminated; and can quickly enter the operating state after confirming the completion of maintenance.

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

[0018] The detection and control system of the present invention is integrated into the hydraulic system. Under normal circumstances, the common functions of the bladder accumulator can be normally realized without affecting the hydraulic system; when it is detected that the internal pressure of the bladder accumulator is abnormal, the damage detection of the bladder accumulator is carried out by opening and cutting off different valves, quickly and accurately assisting in judging whether the fault of the bladder accumulator is caused by bladder damage, thereby being able to help eliminate the fault more quickly and enabling the hydraulic system to resume processing and production as soon as possible. At the same time, this solution can provide decision support for whether the manufacturer replaces the inflatable bladder, escort the normal operation and long-life operation of the production line equipment; improve the safety index of the front-line production workers in the factory and reduce the risks caused by the workers' contact with the working equipment.

[0019] The control system in the present invention lays a foundation for the detection of other fault causes of the accumulator, promotes the development of on-line detection of accumulator faults, is conducive to the realization of on-line health monitoring of the hydraulic system, and lays a foundation for the automation and intelligence of the hydraulic system.

[0020] Other advantages, objectives, and features of the present invention will be described to some extent in the subsequent specification, and to some extent, will be obvious to those skilled in the art based on the study of the following text, or can be taught from the practice of the present invention. The objectives and other advantages of the present invention can be achieved and obtained through the following specification. Brief Description of the Drawings

[0021] In order to make the objectives, technical solutions, and advantages of the present invention clearer, the present invention will be described in detail and preferably below in conjunction with the drawings, where:

[0022] Figure 1 is the system schematic diagram of the present invention;

[0023] Figure 2 is the installation schematic diagram of the bladder breakage detection device unit;

[0024] Figure 3 is the schematic diagram when the bladder accumulator is working normally;

[0025] Figure 4 is the schematic diagram of the intact bladder after the bladder accumulator is completely depressurized;

[0026] Figure 5 is the schematic diagram of the damaged bladder after the bladder accumulator is completely depressurized;

[0027] Figure 6 is the structural schematic diagram of the bladder breakage detection device.

[0028] Reference numerals: 11 - bladder accumulator, 12 - bladder breakage detection device, 13 - control valve integration unit, 14 - control unit, 15 - ball valve, 16 - bladder, 17 - pressure detection device, 21 - cut-off valve, 22 - pressure switch, 23 - damping, 24 - unloading valve, 25 - check valve, 31 - pilot valve, 32 - main valve, 33 - shuttle valve cover plate, P - main pressure oil circuit, L - drain oil circuit, 41 - curved slide rail, 42 - valve sleeve, 43 - ball, 44 - guide ring, 45 - valve core, 46 - pressure sleeve, 47 - fixing screw, 48 - detection element. Detailed Embodiments

[0029] The following uses specific specific examples to illustrate the embodiments of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments. The details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the drawings provided in the following embodiments only illustrate the basic concept of the present invention schematically. Without conflict, the following embodiments and the features in the embodiments can be combined with each other.

[0030] Among them, the attached drawings are only for illustrative purposes, showing only schematic diagrams rather than physical diagrams, and should not be construed as limiting the present invention; in order to better illustrate the embodiments of the present invention, some components in the attached drawings will be omitted, enlarged or reduced, which do not represent the dimensions of the actual product; for those skilled in the art, it is understandable that some well-known structures and their descriptions in the attached drawings may be omitted.

[0031] In the attached drawings of the embodiments of the present invention, the same or similar reference numerals correspond to the same or similar components; in the description of the present invention, it should be understood that if there are terms such as "upper", "lower", "left", "right", "front", "rear", etc. indicating the orientation or positional relationship, they are based on the orientation or positional relationship shown in the attached drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, the terms describing the positional relationship in the attached drawings are only for illustrative purposes and should not be construed as limiting the present invention. For those of ordinary skill in the art, the specific meanings of the above terms can be understood according to specific circumstances.

[0032] As Figures 1 to 5 shown, a control system for detecting the rupture of the bladder of a bladder accumulator includes a bladder accumulator 11, a bladder rupture detection device 12, a control valve integration unit 13, a pressure detection device 17 and a control unit 14; the bladder rupture detection device 12 and the control valve integration unit 13 are respectively electrically connected to the control unit 14; the pressure detection device 17 collects the oil pressure in the oil outlet pipeline of the bladder accumulator 11 and sends the oil pressure detection value to the control unit 14; the control unit 14 receives the oil pressure detection value and determines whether the oil pressure detection value is greater than a preset air pressure value. If the oil pressure detection value is less than the preset air pressure value, a control signal is sent to the control valve integration unit 13 and the bladder rupture detection device 12; the control valve integration unit 13 integrates a cut-off valve 21, a relief valve 24 and a pressure switch 22 (or a pressure sensor); the cut-off valve 21, the relief valve 24 and the pressure switch 22 receive the control signal and switch their on-off states according to the control signal; after receiving the control signal, the bladder rupture detection device 12 collects the stroke data generated by the movement of the inlet valve of the bladder accumulator 11 and sends the stroke data to the control unit 14; the bladder rupture detection device 12 is also connected to an output unit, and the bladder rupture detection device 12 also determines whether the bladder of the bladder accumulator 11 has an expansion action according to the stroke data and sends the judgment result to the output unit for output.

[0033] As Figure 1The schematic diagram of the system is shown as follows. The bladder breakage detection device 12 is fixedly connected to the bladder accumulator 11. The cut-off valve 21 is connected to the bladder accumulator 11 through a connecting pipeline and a control pipeline respectively. The control unit 14 is electrically connected to the cut-off valve 21, the unloading valve 24, the pressure switch 22 and the bladder breakage detection device 12 respectively. The cut-off valve 21 includes an oil outlet one and an oil outlet two. The oil outlet one is connected to the main pressure oil circuit through a connecting pipeline provided with a ball valve 15. The oil outlet two is connected to the inlet valve through a connecting pipeline provided with a stop valve. The inlet valve is connected to the drain oil circuit through a control pipeline provided with a relief valve. The oil outlet two is also connected to the unloading valve 24 through a communicating pipeline. The oil outlet two is also connected to the pressure switch 22 through a control pipeline. The pressure detection device 17 is a pressure gauge.

[0034] The bladder accumulator 11 in this embodiment is a prior art, which includes a shell, a bladder, an inflation valve, an inlet valve (mushroom valve) and an oil valve body for installing the inlet valve. The inflation valve and the oil valve body are fixedly connected to the shell. The open end of the bladder is connected to the inflation valve. The inlet valve is installed in the oil valve body. The inlet valve includes an inlet valve spring, a damping sleeve and a nut which are sleeved on the inlet valve body from top to bottom. The inlet valve remains normally open under the action of the inlet valve spring to regulate the oil flow through the shell. When the airbag is fully expanded, the inlet valve moves downward to close the inlet, and at this time, it is in a fully depressurized state. As Figure 5 shown, when the bladder is damaged, when the broken bladder performs the action of fully depressurizing again, the bladder cannot expand and thus cannot contact and push the inlet valve to make it move.

[0035] The bladder damage detection device 12 includes a guide piece, a valve assembly, and a detection element 48. The guide piece is fixedly connected to the oil inlet valve of the bladder accumulator 11 to move along with the oil inlet valve. One side of the guide piece is fixedly connected between the damping 23 sleeve and the nut to move up and down on the side of the oil valve body away from the housing along with the oil inlet valve. A curved slide rail 41 is provided at the other end of the guide piece, and the curved slide rail 41 is parallel to the axis of the oil inlet valve. The valve assembly includes a valve sleeve 42, a valve core 45, and an elastic element. The valve sleeve 42 penetrates and is fixedly and sealingly connected to the oil valve body of the bladder accumulator 11. The valve core 45 is sleeved inside the valve sleeve 42 and is slidably and sealingly connected to the valve sleeve 42. The elastic element is sleeved inside the valve sleeve 42, and one end of the elastic element is connected to the valve sleeve 42 and the other end is connected to the valve core 45 to apply an axial force to the valve core 45 and limit the axial stroke of the valve core 45. One end of the valve core 45 is slidably connected to the curved slide rail 41 in a direction perpendicular to the valve core 45, and the sliding stroke of the valve core 45 on the curved slide rail 41 is less than the movement stroke of the oil inlet valve, so that the valve core 45 has a normal state of being slidably connected to the curved slide rail 41 and a derailment state of disengaging from the curved slide rail 41. The other end of the valve core 45 is connected to a detection element 48 for detecting the displacement and / or force of the valve core 45. A ball 43 slidably connected to the valve sleeve is provided on the side of the valve core 45 close to the curved slide rail 41 to increase the connection flexibility between the valve core 45 and the curved slide rail 41. A guide ring 44 is sleeved on one end of the valve core 45 close to the curved slide rail 41, and the guide ring 44 limits the stroke of the valve core 45. The valve sleeve 42 is pressed against the oil valve body by fixing screws 47 arranged on the side of the valve sleeve 42 away from the curved slide rail 41, and the fixing screws 47 are of a hollow structure for installing the detection element 48. Sealing rings are provided between the valve sleeve and the oil valve body, between the valve sleeve and the gland 46, and between the gland 46 and the valve core 45 to ensure that hydraulic oil does not leak.

[0036] The above-mentioned bladder damage detection device 12 detects the displacement change of the oil inlet valve through the detection element 48, the valve assembly, and the guide piece. When the intact bladder 16 expands, it will push the oil inlet valve to displace, thereby driving the guide piece to displace downward. The valve core 45 changes from the normal state to the derailment state, and the detection element 48 detects the change signal due to the axial movement of the valve core 45, so it can be determined that the bladder 16 is intact. However, the damaged bladder 16 cannot expand and thus cannot contact and push the oil inlet valve to displace. Furthermore, the guide piece does not generate displacement, and the valve core 45 always maintains the normal state of being connected to the curved slide rail 41 without state change. Therefore, the detection element 48 cannot detect the change signal due to the inability of the valve core 45 to perform axial movement, and it can be determined that the bladder 16 is damaged. The detection element 48 includes a displacement sensor and / or a piezoelectric sensor.

[0037] The detection element of the leather bag damage detection device is electrically connected to the control unit 14 outside the device. In this embodiment, the control unit 14 can be a PLC local operation box or a PLC remote operation console, or a computer installed with the corresponding PLC control software.

[0038] As Figure 1 shown, the single-dotted line represents the overall unit, the double-dotted line represents the electrical connection, the dashed line represents the control pipeline or the oil discharge circuit, and the solid line represents the connection pipeline (i.e., the oil inlet and return oil pipelines). The control valve integration unit 13 is a hydraulic valve block. The hydraulic valve block is provided with a cut-off valve 21 and a unloading valve 24. The cut-off valve 21 is electrically connected to the control unit 14. The cut-off valve 21 includes a pilot valve 31, a main valve 32, and a shuttle valve cover plate 33 arranged between the pilot valve 31 and the main valve 32. The cut-off valve 21 is connected to the unloading valve 24; the unloading valve 24 is electrically connected to the control unit 14. Specifically, the A port of the main valve 32 is connected to the main pressure oil circuit P of the entire hydraulic system through a ball valve 15. The B port of the main valve 32 is connected to the bladder accumulator 11 through a globe valve. The bladder accumulator 11 is connected to the oil discharge circuit L of the entire hydraulic system through a control pipeline provided with a relief valve; the B port of the main valve 32 is connected to the ρ port of the unloading valve 24 through a connecting pipeline. A check valve 25 and a damper 23 are arranged on the connecting pipeline in the direction of the hydraulic oil flow before the ρ port. The check valve 25 can prevent the back pressure of the return oil from interfering, and the damper 23 can limit the unloading flow power limit and reduce the oil flow noise; the inlet port of the check valve 25 is electrically connected to the control unit 14 through a control pipeline provided with a pressure switch; the A port of the unloading valve 24 is connected to the oil discharge circuit L. In this embodiment, the accumulator connected to the hydraulic system can be an accumulator group composed of multiple bladder accumulators 11. The connection method of each bladder accumulator 11 to other components is the same and will not be elaborated. The pressure detection device uses an existing pressure gauge.

[0039] In a certain embodiment, the cut-off valve 21 can directly select an existing electromagnetic emergency cut-off valve, which internally integrates a pilot valve 31, a main valve 32, and a shuttle valve cover plate 33. This component is an existing technology.

[0040] In another preferred embodiment, the pilot valve 31 is a plate-type solenoid valve, the main valve 32 is a large-flow two-way cartridge valve, and the plate-type solenoid valve and the large-flow two-way cartridge valve are inserted into the hydraulic valve block; the unloading valve 24 is a direct-acting seat valve (electromagnetic lift valve) with a two-position switch control function to realize the connection and disconnection of the pressure oil side or the oil discharge circuit of the accumulator; the plate-type solenoid valve, the large-flow two-way cartridge valve, and the direct-acting seat valve are all existing technologies, and existing components of mainstream models on the market can be selected to implement.

[0041] The specific connection circuits of the control unit 14 with the pilot valve 31, the unloading valve 24, the bladder damage detection device 12, and the pressure switch 22 can all be implemented using existing technologies. For example, the power supply of the PLC local operation box is respectively connected to the above-mentioned components through four branches of relay switches with normally open contacts. When the power supply is turned on, the relay switches on the corresponding branches are energized and connected, and the corresponding components on the branch are also energized; when the relay switch on the corresponding branch loses power and disconnects, the corresponding components on the branch also lose power.

[0042] Specific control of the system:

[0043] When the stroke data is zero, the judgment result is OFF; when the stroke data is not zero, the judgment result is ON. The stroke data in this solution refers to the distance that the oil inlet valve moves downward. When the bladder 16 expands, the oil inlet valve of the bladder accumulator 11 moves downward, causing the ball 43 in the bladder damage device 12 to derail from the curved slide rail 41, so that the spool 45 in the bladder damage device 12 moves left and right, and at the same time, the pressure received by the spool 45 changes; when the stroke data is zero, that is, the bladder 16 has not expanded, and when the stroke data is not zero, that is, the bladder 16 has expanded.

[0044] The bladder damage detection device 12 sends the judgment result to the output unit for output. In this solution, the output unit includes a display device and an alarm device. For example, the judgment result is displayed by means of a liquid crystal display screen or light flashing, etc., and at the same time, an alarm is given through a speaker when the judgment result is OFF.

[0045] In this solution, when the cut-off valve 21 receives the control signal sent by the control unit 14, the oil pressure values of an oil inlet and two oil outlets of the main valve 32 are respectively detected by the pressure detection device 17, and the respective oil pressure values are sent to the control unit 14; the control unit 14 compares the magnitudes of the oil pressure values at different ports, selects the port with the largest oil pressure value as the control oil port, and discharges the control oil through the control oil port to maximize the reliable closing of the main valve 32 and avoid affecting other structures of the hydraulic system during the detection process.

[0046] The control unit can be composed of the I / O ports, software, and hardware of the PLC, and is an independent subsystem. All electrical signals are connected to the system, and the interlock relationship is established by the software. The electrical interlock states of each valve under the normal working state of the hydraulic system and the electrical interlock states of each valve under the bladder detection state are respectively saved to form two quick control operation work mode switching buttons, namely the accumulator bladder detection mode and the accumulator normal working mode.

[0047] Accumulator bladder detection mode; in the accumulator bladder detection mode, the electrical interlock relationship of the cut-off valve 21, unloading valve 24, and pressure switch 22 is as follows: the cut-off valve 21 is off, the unloading valve 24 is off, and the pressure switch 22 is on.

[0048] Accumulator normal working mode; in the accumulator normal working mode, the electrical interlock relationship of the cut-off valve 21, unloading valve 24, and pressure switch 22 is as follows: the cut-off valve 21 is on, the unloading valve 24 is on, and the pressure switch 22 is off.

[0049] This solution can quickly control the hydraulic system to return to the normal working state, and when used in conjunction with the accumulator bladder detection mode, it can verify the maintenance results during maintenance to confirm whether the fault has been eliminated. Specifically, refer to the following table:

[0050]

[0051] YVH1, YVH2, PT, and PS are electrical numbers.

[0052] Mode 1: The accumulator is normally put into operation in the hydraulic system (the oil side pressure of the accumulator is greater than the inflation pressure) (such as Figure 3 ).

[0053] The pilot valve 31 (YVH1) of the cut-off valve 21 is energized, the unloading valve 24 (YVH2) is energized, and the accumulator (group) is connected to the main pressure oil circuit of the hydraulic system (without pressure relief), realizing all functional requirements for the accumulator (group) to serve the hydraulic system. It is also possible to first shield the detection system and turn it on, and connect YVH1 and YVH2 to the PLC of the hydraulic system to achieve control.

[0054] Mode 2: The accumulator bladder is detected

[0055] Turn on the detection system of the accumulator 11 and shield the external control of YVH1 and YVH2; the pilot valve 31 (YVH1) of the cut-off valve 21 loses power, the unloading valve 24 (YVH2) loses power, and after the accumulator (group) is disconnected from the main pressure oil circuit of the hydraulic system, it is depressurized. When the oil side pressure of the accumulator (group) is less than the inflation pressure to 0, the pressure switch 22 (or pressure sensor) conducts a interlock confirmation ON. At this time: for a hydraulic system equipped with multiple bladder accumulators 11, if the PS signal of the bladder breakage detection device 12 corresponding to the accumulator is ON, it means that the bladder 16 is not damaged (see Figure 4 ); the PS signal of the corresponding bladder breakage detection device 12 is OFF, which means that the bladder 16 is damaged (see Figure 5 ), that is, the detection is completed, and the system obtains the detection result of the accumulator bladder breakage condition. This detection result can be displayed by connecting a display device to the control unit 14.

[0056] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit them. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified or equivalently replaced without departing from the spirit and scope of the present technical solution, and they should all be covered within the scope of the claims of the present invention.

Claims

1. A control system for detecting the rupture of the bladder of a bladder accumulator, including a bladder accumulator, characterized in that: It also includes a bladder damage detection device, a control valve integration unit, a pressure detection device and a control unit; the bladder damage detection device and the control valve integration unit are respectively electrically connected to the control unit; The pressure detection device collects the oil pressure in the oil outlet pipeline of the bladder accumulator and sends the oil pressure detection value to the control unit; The control unit receives the oil pressure detection value and determines whether the oil pressure detection value is greater than a preset air pressure value. If the oil pressure detection value is less than the preset air pressure value, a control signal is sent to the control valve integration unit and the bladder damage detection device; The control valve integration unit is provided with a cut-off valve, a relief valve and a pressure switch; the cut-off valve, the relief valve and the pressure switch receive the control signal and switch their respective on-off states according to the control signal; After receiving the control signal, the bladder damage detection device collects the stroke data generated by the movement of the inlet valve of the bladder accumulator and sends the stroke data to the control unit; the bladder damage detection device is also connected with an output unit, and the bladder damage detection device also judges whether the bladder of the bladder accumulator has an expansion action according to the stroke data and sends the judgment result to the output unit for output; The cut-off valve includes a pilot valve and a main valve; the pressure detection device respectively detects the oil pressure values at the oil inlet and oil outlet of the main valve and sends the oil pressure values to the control unit; the control unit compares the oil pressure values and selects the port with the largest oil pressure value as the control oil port.

2. The bladder breakage detection control system of a bladder accumulator according to claim 1, characterized in that: When the stroke data is zero, the judgment result is OFF; when the stroke data is not zero, the judgment result is ON.

3. The bladder breakage detection control system of a bladder accumulator according to claim 1, characterized in that: The output unit includes a display device and an alarm device; the display device displays the judgment result; the alarm device gives an alarm when the judgment result is OFF.

4. The bladder breakage detection control system of a bladder accumulator according to claim 1, characterized in that: The control unit is provided with a normal working mode of the accumulator; in the normal working mode of the accumulator, the electrical interlock relationship of the cut-off valve, the relief valve and the pressure switch is: the cut-off valve is connected, the relief valve is connected, and the pressure switch is disconnected.

5. The bladder breakage detection control system of a bladder accumulator according to claim 1, characterized in that: The control unit is provided with a bladder detection mode of the accumulator; in the bladder detection mode of the accumulator, the electrical interlock relationship of the cut-off valve, the relief valve and the pressure switch is: the cut-off valve is disconnected, the relief valve is disconnected, and the pressure switch is connected.

Images