Marine main engine cylinder head pressure test system and control method thereof

Abstract

The invention relates to a marine main engine cylinder head pressure test system and a control method thereof, and relates to the technical field of marine main engine cylinder head pressure test.The marine main engine cylinder head pressure test system comprises a pressure test table, a water supply pool and a waste water pool, a plurality of pressure test tools are placed on the pressure test table, a water supply main pipe is arranged on the water supply pool in a communicating mode, and a pipe body of the water supply main pipe is fixedly installed on the side wall of the pressure test table; the water supply main pipe is communicated with a plurality of water supply branch pipes, and the plurality of water supply branch pipes are respectively communicated with the water inlets of the plurality of pressure test tools; a pneumatic liquid pump is installed on the water supply main pipe and externally connected with an air source, and branch pipe valves are installed on the water supply branch pipes respectively. A pressure relief pipeline is arranged on the water supply main pipe in a communicating mode, an outlet of the pressure relief pipeline is communicated with the waste water pool, and a pressure relief valve is installed on the pressure relief pipeline. The hydraulic test efficiency of the marine main engine cylinder head can be effectively improved.

Description

Technical Field

[0001] The present application relates to the field of ship main engine cylinder head pressure testing technology, and in particular to a ship main engine cylinder head pressure testing system and a control method thereof. Background Art

[0002] The main engine of a ship is the heart of the ship. The main engine cylinder head and generator cylinder head are the main sources of ship manufacturing power, so the cylinder head is an important heart component in the ship. The main engine cylinder head, generator cylinder head and piston head and other components that burn at high temperatures all day long are bound to be worn or damaged during long-term use. Therefore, during the maintenance and repair of the ship, it is often necessary to disassemble the cylinder head and accessories to determine whether there are cracks or defects in the cylinder head.

[0003] The maintenance of the main engine cylinder head of a ship is generally to remove the cylinder head from the crude oil main engine of the offshore platform and transfer it to the land workshop for maintenance, so as to reduce the limited manpower and space occupation of the offshore platform and shorten the maintenance cycle. When the cylinder head is repaired, it is necessary to perform a water pressure test on the cylinder head to determine whether there is any leakage in the cylinder head.

[0004] In the prior art, a water pressure test bench is mainly used to test the main engine cylinder head. The water pressure test platform mainly includes a pressure test bench body, a pressure test fixture and a water supply system. The pressure test fixture includes an outer sealing ring and an inner sealing ring, and the pressure test fixture is connected to a water inlet for connecting to a water supply pipe. The pressure test fixture is fixedly installed on the surface of the pressure test bench body. The operator can install and fix the cylinder head on the pressure test bench body through the pressure test fixture, and then connect the cylinder head to the water supply system. Through the pressure gauge on the water supply system pipeline, the operator can judge whether there is pressure relief in the cylinder head by observing the pressure gauge value to evaluate the air tightness of the main engine cylinder head of the ship.

[0005] However, the existing test platform can only perform pressure testing on one cylinder head at a time, and usually a large number of cylinder heads need to be pressure tested. The repeated installation-pipeline connection-disassembly of the cylinder heads requires a lot of time and effort, and is inefficient. Summary of the invention

[0006] In order to improve the efficiency of pressure testing the cylinder head of a ship main engine, the present application provides a ship main engine cylinder head pressure testing system and a control method thereof.

[0007] The present application provides a ship main engine cylinder head pressure test system and a control method thereof, which adopts the following technical solutions:

[0008] A pressure test system for a cylinder head of a main engine of a ship, comprising a pressure test platform, a water supply tank and a wastewater tank, wherein a plurality of pressure test fixtures are placed on the pressure test platform, a water supply main pipe is connected to the water supply tank, a pipe body of the water supply main pipe is fixedly installed on the side wall of the pressure test platform, a plurality of water supply branch pipes are connected to the water supply main pipe, and the plurality of water supply branch pipes are connected to the water inlets of the plurality of pressure test fixtures respectively;

[0009] A pneumatic liquid pump is installed on the water supply main pipe, and the pneumatic liquid pump is connected to an external air source. Branch pipe valves are installed on several of the water supply branch pipes respectively.

[0010] The water supply branches are respectively connected with pressure relief pipes, the outlets of the pressure relief pipes are connected with the wastewater pool, and the pressure relief pipes are respectively installed with pressure relief valves; and:

[0011] A control console, located beside the pressure test bench, for inputting a set test pressure signal, a set pressure holding time signal, and a start signal;

[0012] A plurality of water pressure sensors are respectively installed on a plurality of the water supply branch pipes, and the signal input ends are connected to the signal output ends of the control console, and are used to receive the start signal and output the current test pressure signals respectively;

[0013] A plurality of alarms are fixedly mounted on the side walls of the pressure test platform, and are respectively arranged corresponding to the plurality of pressure test fixtures;

[0014] A pressure test control module, whose signal input end is signal-connected to the signal output end of the console, is used to receive the start signal, the set test pressure signal, and the set pressure holding time signal, and control the filling of water in a plurality of the pressure test fixtures, and output a first control signal when the test water pressure reaches the set test pressure and the pressure holding time reaches the set pressure holding time;

[0015] The pressure relief verification module has a signal input end connected to the signal output end of the pressure test control module, and a signal output end connected to a plurality of the alarm signals, and is used to receive the first control signal and calculate the pressure relief coefficient of the cylinder head respectively, and control the corresponding alarm to send a warning signal when the pressure relief coefficient of any of the pressure test tooling exceeds the set value.

[0016] By adopting the above technical scheme, when the operator uses the pressure test system to perform a water pressure test on the cylinder head of the main engine of the ship, the operator can continuously lift multiple cylinder heads to the pressure test fixture on the pressure test table through the lifting tool. After the operator connects the multiple cylinder heads to the pressure test fixture respectively, the operator can connect the water supply branch pipe and the water inlet of the pressure test fixture through a hose; then, the operator can input the set test pressure signal and the set pressure holding time signal according to the test water pressure and pressure holding time requirements of the cylinder head to be tested, and then input the start signal; the pneumatic liquid pump on the water supply main and the branch pipe valves on the water supply branch pipes are opened after receiving the start signal, and the water in the water supply tank passes through the water supply main and the water supply branch pipe to fill the pressure test fixture with water; when the test water body is pressurized to the set test pressure, the start liquid pump and the branch pipe valves are closed, so that the water body in the pressure test fixture maintains the pressure for the required set time. When the pressure holding time is reached, the pressure relief verification module measures the current test pressure according to the water pressure sensor on the water supply branch pipe and compares it with the set test pressure to calculate the pressure relief coefficient of the cylinder head. When the pressure relief coefficient exceeds the set pressure relief value, the corresponding alarm is controlled to send a warning signal to remind the on-site operator that the cylinder head has cracks and defects. Through the multiple pressure test fixtures and multiple water supply branches set on the pressure test table, multiple cylinder heads can be tested for water pressure at the same time, which can effectively improve the efficiency of the cylinder head water pressure test. At the same time, through the mutual matching and use of the control console, the pressure test control module, and the pressure relief verification module, the water pressure test of multiple cylinder heads can be automatically controlled at the same time according to the set test pressure and set pressure holding time set by the operator, and the current test pressure of multiple cylinder heads is automatically verified at the same time after the pressure holding time is reached, and the cylinder head whose pressure relief coefficient exceeds the set value is alarmed. The operator only needs to observe the state of the alarm to determine whether the corresponding cylinder head has cracks and defects, which avoids the operator from observing the pressure holding time difference caused by the water pressure gauge one by one, and ensures the accuracy and convenience of the water pressure test. When the test is completed, the operator can connect the pressure relief pipe by controlling the pressure relief valve of the pressure relief pipe, and at the same time control the branch valve to open, so that the water inside the pressure test tooling pipe flows to the wastewater pool through the pressure relief pipe and is transported to the wastewater treatment system, which can effectively ensure the cleanliness of the water pressure test working environment and improve the working environment.

[0017] Preferably, the pressure test control module includes:

[0018] A boost control unit, whose signal input end is signal-connected to the signal output end of the console, and whose signal output end is signal-connected to the pneumatic liquid pump and the signal input ends of the plurality of branch valves, for receiving the start signal and the set test pressure signal and starting water filling, and stopping water filling after the test water pressure of the pressure test fixture reaches the set test pressure;

[0019] A pressure holding control unit, whose signal input terminal is connected to the signal output terminal of the console, is used to receive the set pressure holding time signal and control the set pressure holding time of several pressure test fixtures.

[0020] By adopting the above technical scheme, when the operator inputs the set test pressure, sets the pressure holding time and starts the pressure test system through the console, the boost control unit controls the pneumatic liquid pump and the branch valve to fill the pressure test fixture with water. When the test water pressure of the pressure test fixture reaches the set test pressure, the boost control unit controls the pneumatic liquid pump and the branch valve to close, and the pressure holding control unit controls the test water body in the pressure test fixture to maintain the set pressure holding time, thereby achieving the technical effects of automatic pressure boost and automatic pressure holding.

[0021] Preferably, the boost control unit comprises:

[0022] A first single chip microcomputer, whose signal input end is signal-connected to the signal output end of the console, whose signal output end is signal-connected to the signal input ends of the pneumatic liquid pump and the plurality of branch pipe valves, for receiving the start signal and controlling the start of the pneumatic liquid pump and the plurality of branch pipe valves;

[0023] The signal input end of the first single chip microcomputer is also signal-connected to the signal output ends of the plurality of water pressure sensors, and the first single chip microcomputer receives the plurality of current test pressure signals and outputs a first control signal when the plurality of current test pressures all reach the set test pressure;

[0024] The signal input ends of the starting liquid pump and the branch pipe valves are signal-connected to the signal output ends of the first single-chip microcomputer, and the starting liquid pump and the branch pipe valves receive the first control signal and are closed.

[0025] By adopting the above technical scheme, when the operator inputs the start signal through the console, the first single-chip microcomputer recognizes the start signal and controls the pneumatic liquid pump and the branch valve to open, so as to fill water for the multiple pressure test fixtures on the pressure test bench, and the pressure test system enters the pressure boosting state; in this process, the water pressure sensor detects the water pressure of the water body inside each water supply branch pipe. When the water pressure in each water supply branch pipe reaches the set test pressure, it can be determined that the test water pressure in the pipeline system reaches the required set test pressure, and the first single-chip microcomputer controls the pneumatic liquid pump and each branch valve to close, so as to achieve the technical effect of automatic pressure boost and control of the test pressure.

[0026] Preferably, the pressure-maintaining control unit comprises:

[0027] A timer, whose signal input terminal is signal-connected to the signal input terminal of the first single-chip computer, and is used to receive the first control signal, time, and output a current pressure-holding duration signal;

[0028] The second single chip microcomputer has a signal input end connected to the signal output end of the timer and the console, and is used to receive and compare the current pressure holding time signal and the set pressure holding time signal, and output a second control signal when the current pressure holding time reaches the set pressure holding time.

[0029] By adopting the above technical solution, the timer and the second single-chip computer are matched and used with each other, and the pressure holding time can be controlled according to the set pressure holding time input by the operator, thereby achieving the technical effect of automatic pressure holding.

[0030] Preferably, the pressure relief verification module includes:

[0031] An ARM signal processor, whose signal input end is signal-connected to the control console, the second single-chip microcomputer and the signal output ends of the plurality of water pressure sensors, is used to receive the second control signal and respectively compare the current test pressure with the set test pressure, and respectively output a pressure relief coefficient signal;

[0032] A plurality of comparator chips, whose signal input terminals are connected to the signal output terminals of the ARM signal processor, wherein the plurality of comparator chips receive and compare the pressure relief coefficient signals, and output high-level signals when the pressure relief coefficient is greater than a set value;

[0033] The signal input ends of the plurality of alarms are respectively connected to the signal output ends of the plurality of comparator chips in a one-to-one correspondence, and the alarms receive the high-level signals and send out warning signals.

[0034] By adopting the above technical solution, through the ARM signal processor, when the set pressure holding time is reached, the ARM signal processor collects the water pressure after pressure holding and compares it with the set test pressure to calculate the pressure relief coefficient of each cylinder head. The comparator chip compares the pressure relief values, and can judge the pressure relief state of each cylinder head respectively, and judge whether each cylinder head has cracks or defects. When the pressure holding time is reached, each cylinder head can be automatically calibrated at the same time, which can save the operator from comparing the water pressure sensor readings on each water supply branch one by one to judge whether the cylinder head has cracks or defects, thereby further improving the convenience of the operator in using the pressure test system, and further improving the efficiency of the pressure test system in performing water pressure tests on cylinder heads.

[0035] Preferably, some of the alarms include a buzzer and a flashlight, the buzzer receives the warning signal and emits a warning sound, and the flashlight receives the warning signal and emits a warning flash.

[0036] By adopting the above technical solution, when the cylinder head is inspected abnormally, the buzzer corresponding to the cylinder head emits a warning sound and the flash light emits a warning flash, which can assist the operator to quickly locate the cylinder head with cracks or defects.

[0037] Preferably, the wastewater pool is located underground beside the pressure test platform, the wastewater pool is connected to the wastewater treatment system, and a water pass plate is fixedly installed on the top of the pool mouth of the wastewater pool, and a plurality of water holes for wastewater to flow in are opened on the water pass plate.

[0038] By adopting the above technical solution, when cracks or defects exist in the cylinder head and cause the water in the pressure test tooling to overflow through the cracks in the cylinder head, the overflowing water can flow out through the pressure test platform and then directly penetrate into the wastewater pool through the water pass plate, which can reduce the situation where the water flows to the ground and causes the ground to be slippery and affects the working environment, and can further improve the working environment at the water pressure test site.

[0039] Preferably, a rotating nozzle is fixedly mounted on the top inner wall of the wastewater tank, and a cleaning pipe is provided in communication between the water supply tank and the rotating nozzle.

[0040] By adopting the above technical solution, after the operator completes the water pressure test operation, the operator can flush the wastewater pool through the rotating nozzle, which can effectively reduce the situation where the oil in the pressure test wastewater adheres to the wastewater pool and causes the working environment to stink.

[0041] A control method for a cylinder head pressure test system of a ship main engine comprises the following steps:

[0042] S1: Install multiple cylinder heads on the pressure test fixtures on the pressure test bench respectively;

[0043] S2: Connect the water inlet of the pressure test fixture to the water supply branch pipe through a hose;

[0044] S3: Control the pressure test system through the console to increase the pressure of the pressure test tooling, maintain the pressure, and then verify the water pressure in the pressure test tooling;

[0045] S4: After waiting for a while, observe the buzzer and the flash light on the pressure test table, and judge whether the cylinder head installed on the corresponding pressure test tooling has defects according to the status of the buzzer and the flash light;

[0046] S5: Remove the cylinder head.

[0047] By adopting the above technical solution, during the process of conducting a water pressure test on multiple cylinder heads, the operator can use the lifting tool to place the multiple cylinder heads on the pressure test fixture in advance, and then the operator installs the multiple light heads on the pressure test fixture and connects the water supply branch pipe to the water inlet on the pressure test fixture; then the operator controls the pressure test system through the console to automatically perform a pressure test on the cylinder head, and after waiting for a period of time, the operator can judge whether the corresponding cylinder head has cracks or defects by whether the buzzer and flash light on the pressure test table are running. While conducting a water pressure test on multiple cylinder heads at the same time, it is unnecessary for the staff to observe the readings of the water pressure sensor one by one to judge whether the cylinder head has cracks or defects, which can effectively improve the efficiency of the pressure test. After the test is completed, the operator removes the multiple cylinder heads on the pressure test table and then performs a water pressure test on the next batch of cylinder heads.

[0048] Preferably, S3 comprises the following steps:

[0049] S31: input the test pressure signal through the console;

[0050] S32: Input a pressure holding time setting signal through the console;

[0051] S33: Input the start signal through the console.

[0052] By adopting the above technical solution, the test pressure and pressure holding time are set through the console and then the start signal is input. The pressure test system can be controlled to automatically fill the pressure test tooling with water according to the set test pressure, and at the same time, the pressure test tooling is automatically controlled to perform the pressure holding operation when the test pressure is reached.

[0053] In summary, the present application provides a ship main engine cylinder head pressure test system and a control method thereof, which include at least one of the following beneficial technical effects:

[0054] 1. Through the coordination and use of the control console, water supply tank, water supply main pipe, water supply branch pipe, pneumatic liquid pump and branch pipe valve, the operator can set the test pressure and the pressure holding time through the control console to start the pneumatic pressure test system. The pneumatic liquid pump and the branch pipe valve are automatically started by the first single-chip microcomputer, and are closed after the pressure is increased to the set test pressure. The timer and the second single-chip microcomputer count the pressure holding time and control the ARM signal processor and several comparator chips to perform pressure calibration on each cylinder head at the same time after the pressure holding time reaches the set pressure holding time. When the cylinder head is abnormally depressurized, the corresponding buzzer and flash light are controlled to operate to remind the on-site operator that the cylinder head has cracks and defects. It can realize water pressure testing and calibration of multiple cylinder heads at the same time, and can automatically alarm the cylinder heads with cracks and defects, which can effectively improve the efficiency and convenience of operators in performing water pressure testing on cylinder heads;

[0055] 2. Through the setting of wastewater pool and water-passing plate, the wastewater generated during the hydraulic pressure test and the wastewater escaping from the cylinder head or the pressure test tooling and flowing out from the pressure test platform can be collected, which can avoid the slippery and dirty working environment and ensure the clean working environment at the hydraulic pressure test site;

[0056] 3. By setting the rotating nozzle in the wastewater pool, the operator can flush the wastewater pool through the rotating nozzle, which can effectively reduce the situation where the oil in the pressure test wastewater adheres to the wastewater pool and causes the working environment to stink. BRIEF DESCRIPTION OF THE DRAWINGS

[0057] Figure 1 It is a schematic diagram of an embodiment of the present application for demonstrating the overall structure of a pressure test system.

[0058] Figure 2 It is a schematic diagram of an embodiment of the present application for demonstrating the overall structure of the pressure test bench.

[0059] Figure 3 It is a schematic diagram of the piping system of the pressure test system used in the embodiment of the present application.

[0060] Figure 4 It is a schematic diagram used in the embodiment of the present application to show the internal structure of the wastewater pool.

[0061] Figure 5 It is a schematic diagram of an embodiment of the present application for demonstrating the internal signal transmission of a pressure test system.

[0062] Figure 6 It is a schematic diagram of an embodiment of the present application for demonstrating a method for controlling a pressure test system.

[0063] Explanation of the reference numerals in the accompanying drawings: 1. Water supply tank; 2. Pressure test bench; 21. Pressure test tooling; 22. Water supply main pipe; 221. Pneumatic liquid pump; 23. Water supply branch pipe; 231. Branch pipe valve; 24. Pressure relief pipe; 241. Pressure relief valve; 25. Water pressure sensor; 26. Alarm; 261. Buzzer; 262. Flashing light; 27. Cleaning pipe; 3. Wastewater tank; 31. Water flow plate; 32. Rotating nozzle; 4. Control console. DETAILED DESCRIPTION

[0064] The following is combined with Figure 1-6 This application is described in further detail.

[0065] Example

[0066] The present application embodiment discloses a ship main engine cylinder head pressure test system and a control method thereof. Figure 1 , Figure 2 as well as Figure 3 The pressure test system is mainly composed of a pressure test platform, a water supply tank and a wastewater tank.

[0067] In an embodiment of the present application, six pressure testing fixtures are placed on the pressure testing platform, a water supply main is provided on the upper part of the water supply tank, and the pipe body of the water supply main is fixedly installed on the side wall of the pressure testing platform by means of clips and screws, and six water supply branches are provided on the upper part of the water supply main, and the six water supply branches correspond to the six pressure testing fixtures respectively.

[0068] Reference Figure 1 and Figure 3 A pneumatic liquid pump is installed on the water supply main pipe, branch valves and water pressure sensors are installed on the six water supply branch pipes, and alarms are installed on the side wall surfaces of the pressure test bench corresponding to the six pressure test fixtures.

[0069] Among them, six water supply branches are respectively connected with pressure relief pipes, the water outlets of the pressure relief pipes extend into the wastewater pool, and pressure relief valves are respectively installed on the six pressure relief pipes.

[0070] The pressure test system also includes a control console, a pressure test control module and a pressure relief verification module. The operator inputs the set test pressure signal, the set pressure holding time signal and the start signal through the control console installed next to the pressure test table.

[0071] Among them, the signal input end of the pressure test control module is connected to the signal output end of the control console. The pressure test control module receives the start signal, sets the test pressure signal, sets the pressure holding time signal, and controls the pneumatic liquid pump and the branch valve to start filling the pressure test tooling with water and maintaining the pressure, and outputs the first control signal when the pressure holding time reaches the set pressure holding time.

[0072] The signal input end of the pressure relief verification module is connected to the signal output end of the pressure test control module, and the signal output end is connected to the signal input ends of six alarms. The pressure relief verification module can automatically verify the difference between the current test water pressure and the set test pressure after reaching the set pressure holding time to calculate the cylinder head pressure relief coefficient respectively, and control the corresponding alarm to send a warning signal when the cylinder head pressure relief coefficient is abnormal.

[0073] For example, in the embodiment of the present application, the test pressure of the cylinder head of the main engine of the ship is 0.7 MPa, and the pressure relief coefficient of the cylinder head with normal function is less than 8% when the pressure is maintained at a water pressure of 0.7 MPa for 30 minutes.

[0074] Among them, the pressure relief coefficient is a, the set test pressure is P1, the water pressure in the pressure test tooling after 30 minutes of pressure maintenance is P2, a = (P1-P2) / P1, if the pressure relief coefficient is less than 8%, it is judged that the cylinder head is normal; if the pressure relief coefficient is greater than 8%, it is judged that the cylinder head has cracks and damage.

[0075] When the operator uses the pressure test system to conduct a water pressure test on the cylinder head of the ship's main engine, he can use the lifting tool to continuously lift multiple cylinder heads to the pressure test fixture on the pressure test table. After the operator connects the multiple cylinder heads to the pressure test fixture respectively, he can connect the water supply branch pipe to the water inlet of the pressure test fixture through a hose; then, the operator can input the set test pressure signal to 0.7MPa and the set pressure holding time to 30min according to the test water pressure and pressure holding time required for the cylinder head to be tested, and then input the start signal.

[0076] The pneumatic liquid pump on the water supply main and the branch valves on several water supply branches are turned on after receiving the start signal, and the water in the water supply pool is filled with water for the pressure test fixture after passing through the water supply main and water supply branches; when the pressure of the test water body is increased to 0.7MPa, the start liquid pump and several branch valves are closed, so that the water in the pressure test fixture is kept under pressure for 30 minutes. After 30 minutes when the pressure is maintained, the pressure relief verification module calculates the pressure relief coefficient of the cylinder head based on the current test pressure measured by the water pressure sensor on the water supply branch and compares it with 0.7MPa, and controls the corresponding alarm to send a warning signal when the pressure relief coefficient exceeds 8%, prompting the on-site operator that the cylinder head has cracks and defects.

[0077] Through the multiple pressure test fixtures and multiple water supply branches set on the pressure test table, multiple cylinder heads can be tested for water pressure at the same time, which can effectively improve the efficiency of the cylinder head water pressure test. At the same time, through the mutual coordination and use of the control console, the pressure test control module, and the pressure relief verification module, the water pressure test of multiple cylinder heads can be automatically controlled according to the set test pressure and the set pressure holding time set by the operator. After the pressure holding time is reached, the current test pressure of multiple cylinder heads is automatically checked at the same time, and the cylinder head whose pressure relief coefficient exceeds the set value is alarmed. The operator only needs to observe the status of the alarm to determine whether the corresponding cylinder head has cracks or defects, eliminating the operator from observing the pressure holding time difference caused by the water pressure gauge one by one, ensuring the accuracy and convenience of the water pressure test.

[0078] It should be noted that, in the embodiment of the present application, the air source of the pneumatic liquid pump is installed on the side of the pressure test bench, and the air source of the pneumatic liquid pump is mainly composed of an air bottle, an air compressor and a fixed pump pressure tooling.

[0079] Reference Figure 1 and Figure 3 The wastewater pool is located below the ground in front of the pressure test platform. The wastewater pool is connected to the wastewater treatment system through a wastewater pipe. A water-passing plate is installed at the pool mouth, and a number of water-passing holes are opened on the water-passing plate. A pressure relief pipe is connected to the pipe body of the water supply main pipe. The outlet end of the pressure relief pipe extends into the wastewater pool, and a pressure relief valve is installed on the pressure relief pipe.

[0080] When the test is completed, the operator can connect the pressure relief pipe by controlling the pressure relief valve of the pressure relief pipe, so that the water inside the pressure test tooling flows to the wastewater pool through the pressure relief pipe and is transported to the wastewater treatment system, which can effectively ensure the cleanliness of the water pressure test working environment and improve the working environment.

[0081] At the same time, when there are cracks or defects in the cylinder head and the water in the pressure test tooling overflows through the cracks in the cylinder head, the overflowing water can flow out through the pressure test platform and then directly seep into the wastewater pool through the water pass plate, which can reduce the situation where the water flows to the ground and causes the ground to be slippery and affect the working environment, and can further improve the working environment at the water pressure test site.

[0082] Reference Figure 4 A rotating nozzle is fixedly installed on the top inner wall of the wastewater pool, and a cleaning pipe is connected to the water supply pool, through which water can be supplied to the rotating nozzle.

[0083] After the operator completes the water pressure test, he can flush the wastewater pool through the rotating nozzle, which can effectively reduce the oil in the pressure test wastewater adhering to the wastewater pool and causing the working environment to stink.

[0084] Reference Figure 5 In an embodiment of the present application, the pressure test control module includes a pressure boost control unit and a pressure maintaining control unit.

[0085] The boost control unit uses a first single chip microcomputer, whose signal input terminal is connected to the signal output terminal of the control console, and whose signal output terminal is connected to the signal input terminals of the pneumatic liquid pump and six branch valves.

[0086] When the operator inputs a start signal through the console, the first single-chip microcomputer receives and identifies the start signal, and controls the start liquid pump and the branch valve to open, so as to fill water into the pressure test tooling on the pressure test bench.

[0087] The signal input end of the first single-chip microcomputer is also connected to the signal output end of the water pressure sensor on the six water supply branches. During the water filling process, the six water pressure sensors are simultaneously activated and detect the water pressure of the water bodies in the six water supply branches in real time and output the current test pressure signal. When the test pressure signal is fed back to the first single-chip microcomputer, when the current test pressure reaches 0.7MPa, the first single-chip microcomputer controls the pneumatic liquid pump and the six branch pipe valves to close, which can achieve the technical effect of automatically increasing the pressure and controlling the test pressure.

[0088] Reference Figure 5 In the embodiment of the present application, the pressure holding control unit includes a timer and a second single chip microcomputer. The signal input end of the timer is connected to the signal output end of the first single chip microcomputer. After receiving the first control signal, the timer pneumatically counts and outputs the current pressure holding time signal.

[0089] The signal input end of the second single-chip microcomputer is connected to the signal output end of the timer and the control console. The second single-chip microcomputer receives the current pressure holding time signal and the set pressure holding time signal and compares them. When the current pressure holding time reaches 30 minutes, the second single-chip microcomputer outputs a second control signal.

[0090] Reference Figure 5The pressure relief verification module includes an ARM signal processor and six comparator chips. The signal input end of the ARM signal processor is connected to the control console, the second single-chip microcomputer and the signal output end of several water pressure sensors. After receiving the second control signal, the ARM signal processor compares the current test pressure of the six pressure test fixtures with 0.7MPa to calculate the pressure relief coefficient of each main engine cylinder head.

[0091] The signal output ends of the six comparator chips are respectively connected to the corresponding signals of the six alarms on the pressure test bench, and the signal input ends of the six comparator chips are connected to the signal output ends of the ARM signal processor. The six comparator chips respectively receive the pressure relief coefficient signals of the six cylinder heads and compare them. When the pressure relief coefficient is greater than 8%, the comparator chip controls the corresponding alarm to send a warning signal to remind on-site operators that the cylinder head has cracks or defects.

[0092] Through the ARM signal processor, when the set pressure holding time is reached, the ARM signal processor collects the water pressure after pressure holding and compares it with 0.7MPa to calculate the pressure relief coefficient of each cylinder head. The comparator chip compares the pressure relief values, and can judge the pressure relief status of each cylinder head respectively, and judge whether each cylinder head has cracks or defects. When 30 minutes is reached, each cylinder head can be automatically calibrated at the same time, which can save the operator from comparing the water pressure sensor readings on each water supply branch one by one to judge whether the cylinder head has cracks or defects, further improving the convenience of operators using the pressure test system, and further improving the efficiency of the pressure test system in performing water pressure tests on cylinder heads.

[0093] Reference Figure 2 and Figure 5 In the embodiment of the present application, the alarm is composed of a buzzer and a flash light, and the buzzer and the flash light are respectively located beside the six water supply branches.

[0094] When the cylinder head calibration is abnormal, the buzzer corresponding to the cylinder head will sound a warning sound and the flash light will emit a warning flash, which can assist the operator to quickly locate the cylinder head with cracks or defects.

[0095] Reference Figure 6 The present application also proposes a control method for a ship main engine cylinder head pressure test system, which mainly includes the following steps:

[0096] S1: Install multiple cylinder heads on the pressure test fixtures on the pressure test bench respectively;

[0097] S2: Connect the water inlet of the pressure test fixture to the water supply branch pipe through a hose;

[0098] S3: Control the pressure test system through the console to increase the pressure of the pressure test tooling, maintain the pressure, and then verify the water pressure in the pressure test tooling;

[0099] S4: After waiting for a while, observe the buzzer and the flash light on the pressure test table, and judge whether the cylinder head installed on the corresponding pressure test tooling has defects according to the status of the buzzer and the flash light;

[0100] S5: Remove the cylinder head.

[0101] Wherein, step S3 comprises the following steps:

[0102] S31: input the test pressure signal through the console;

[0103] S32: Input a pressure holding time setting signal through the console;

[0104] S33: Input the start signal through the console.

[0105] During the water pressure test on multiple cylinder heads, the operator can use the lifting tool to place the multiple cylinder heads on the pressure test fixture in advance, and then the operator installs the multiple heads on the pressure test fixture and connects the water supply branch pipe to the water inlet on the pressure test fixture; then the operator controls the pressure test system through the console to automatically perform a pressure test on the cylinder head, and after waiting for a period of time, the operator can judge whether the corresponding cylinder head has cracks or defects by whether the buzzer and flash light on the pressure test table are running. The water pressure test can be performed on multiple cylinder heads at the same time, eliminating the need for the staff to observe the readings of the water pressure sensor one by one to judge whether the cylinder head has cracks or defects, which can effectively improve the efficiency of the pressure test.

[0106] By setting the test pressure and pressure holding time through the console and inputting the start signal, the pressure test system can be controlled to automatically fill the pressure test fixture with water according to the set test pressure, and at the same time, the pressure test fixture is automatically controlled to perform the pressure holding operation when the test pressure is reached.

[0107] The implementation principle of a ship main engine cylinder head pressure test system and its control method in the embodiment of the present application is as follows: through the mutual coordination and use of a control console, a water supply tank, a water supply main pipe, a water supply branch pipe, a pneumatic liquid pump and a branch pipe valve, an operator can set the test pressure and the pressure holding time through the control console to start the pneumatic pressure test system. The pneumatic liquid pump and the branch pipe valve are automatically started by the first single-chip microcomputer, and are closed after the pressure is increased to the set test pressure. The timer and the second single-chip microcomputer count the pressure holding time and control the ARM signal processor and several comparator chips to perform pressure calibration on each cylinder head at the same time after the pressure holding time reaches the set pressure holding time. When the cylinder head pressure relief is abnormal, the corresponding buzzer and flash light are controlled to run to remind the on-site operator that the cylinder head has cracks and defects. It can realize water pressure testing and calibration of multiple cylinder heads at the same time, and automatically alarm the cylinder heads with cracks and defects, which can effectively improve the efficiency and convenience of the operator's water pressure test operation on the cylinder head.

[0108] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A ship main engine cylinder head pressure test system, characterized in that: It includes a pressure test platform, a water supply tank and a wastewater tank. A plurality of pressure test fixtures are placed on the pressure test platform. A water supply main pipe is connected to the water supply tank. The pipe body of the water supply main pipe is fixedly installed on the side wall of the pressure test platform. A plurality of water supply branch pipes are connected to the water supply main pipe. The plurality of water supply branch pipes are connected to the water inlets of the plurality of pressure test fixtures respectively. A pneumatic liquid pump is installed on the water supply main pipe, and the pneumatic liquid pump is connected to an external air source. Branch pipe valves are installed on several of the water supply branch pipes respectively. The water supply branch pipes are respectively connected with pressure relief pipes, the outlets of the pressure relief pipes are connected with the wastewater tank, and the pressure relief pipes are respectively installed with pressure relief valves; as well as: A control console, located beside the pressure test bench, for inputting a set test pressure signal, a set pressure holding time signal, and a start signal; A plurality of water pressure sensors are respectively installed on a plurality of the water supply branch pipes, and the signal input ends are connected to the signal output ends of the control console, and are used to receive the start signal and output the current test pressure signals respectively; A plurality of alarms are fixedly mounted on the side walls of the pressure test platform, and are respectively arranged corresponding to the plurality of pressure test fixtures; A pressure test control module, whose signal input end is signal-connected to the signal output end of the console, is used to receive the start signal, the set test pressure signal, and the set pressure holding time signal, and control the filling of water in a plurality of the pressure test fixtures, and output a first control signal when the test water pressure reaches the set test pressure and the pressure holding time reaches the set pressure holding time; The pressure relief verification module has a signal input end connected to the signal output end of the pressure test control module, and a signal output end connected to a plurality of the alarm signals, and is used to receive the first control signal and calculate the pressure relief coefficient of the cylinder head respectively, and control the corresponding alarm to send a warning signal when the pressure relief coefficient of any of the pressure test tooling exceeds the set value.

2. A ship main engine cylinder head pressure test system according to claim 1, characterized in that: The pressure test control module comprises: A boost control unit, whose signal input end is signal-connected to the signal output end of the console, and whose signal output end is signal-connected to the pneumatic liquid pump and the signal input ends of the plurality of branch valves, for receiving the start signal and the set test pressure signal and starting water filling, and stopping water filling after the test water pressure of the pressure test fixture reaches the set test pressure; A pressure holding control unit, whose signal input terminal is connected to the signal output terminal of the console, is used to receive the set pressure holding time signal and control the set pressure holding time of several pressure test fixtures.

3. A ship main engine cylinder head pressure test system according to claim 2, characterized in that: The boost control unit comprises: A first single chip microcomputer, whose signal input end is signal-connected to the signal output end of the console, whose signal output end is signal-connected to the signal input ends of the pneumatic liquid pump and the plurality of branch pipe valves, for receiving the start signal and controlling the start of the pneumatic liquid pump and the plurality of branch pipe valves; The signal input end of the first single chip microcomputer is also signal-connected to the signal output ends of the plurality of water pressure sensors, and the first single chip microcomputer receives the plurality of current test pressure signals and outputs a first control signal when the plurality of current test pressures all reach the set test pressure; The signal input ends of the starting liquid pump and the branch pipe valves are signal-connected to the signal output ends of the first single-chip microcomputer, and the starting liquid pump and the branch pipe valves receive the first control signal and are closed.

4. A ship main engine cylinder head pressure test system according to claim 3, characterized in that: The pressure maintaining control unit comprises: A timer, whose signal input terminal is signal-connected to the signal input terminal of the first single-chip computer, and is used to receive the first control signal, time, and output a current pressure-holding duration signal; The second single chip microcomputer has a signal input end connected to the signal output end of the timer and the console, and is used to receive and compare the current pressure holding time signal and the set pressure holding time signal, and output a second control signal when the current pressure holding time reaches the set pressure holding time.

5. A ship main engine cylinder head pressure test system according to claim 4, characterized in that: The pressure relief verification module comprises: An ARM signal processor, whose signal input end is signal-connected to the control console, the second single-chip microcomputer and the signal output ends of the plurality of water pressure sensors, is used to receive the second control signal and respectively compare the current test pressure with the set test pressure, and respectively output a pressure relief coefficient signal; A plurality of comparator chips, whose signal input terminals are connected to the signal output terminals of the ARM signal processor, wherein the plurality of comparator chips receive and compare the pressure relief coefficient signals, and output high-level signals when the pressure relief coefficient is greater than a set value; The signal input ends of the plurality of alarms are respectively connected to the signal output ends of the plurality of comparator chips in a one-to-one correspondence, and the alarms receive the high-level signals and send out warning signals.

6. A ship main engine cylinder head pressure test system according to claim 5, characterized in that: Some of the alarms include a buzzer and a flashlight. The buzzer receives the warning signal and emits a warning sound, and the flashlight receives the warning signal and emits a warning flash.

7. A ship main engine cylinder head pressure test system according to claim 6, characterized in that: The wastewater pool is located underground beside the pressure test platform, the wastewater pool is connected to the wastewater treatment system, and a water flow plate is fixedly installed on the top of the pool mouth of the wastewater pool, and a plurality of water flow holes for wastewater to flow into are opened on the water flow plate.

8. A ship main engine cylinder head pressure test system according to claim 7, characterized in that: A rotating nozzle is fixedly installed on the top inner wall of the wastewater pool, and a cleaning pipeline is connected between the water supply pool and the rotating nozzle.

9. A control method for a ship main engine cylinder head pressure test system, characterized in that: The following steps are involved: S1: Install multiple cylinder heads on the pressure test fixtures on the pressure test bench respectively; S2: Connect the water inlet of the pressure test fixture to the water supply branch pipe through a hose; S3: Control the pressure test system through the console to increase the pressure of the pressure test tooling, maintain the pressure, and then verify the water pressure in the pressure test tooling; S4: After waiting for a while, observe the buzzer and the flash light on the pressure test table, and judge whether the cylinder head installed on the corresponding pressure test tooling has defects according to the status of the buzzer and the flash light; S5: Remove the cylinder head.

10. A method for controlling a cylinder head pressure test system for a ship main engine according to claim 9, characterized in that: The S3 comprises the following steps: S31: input the test pressure signal through the console; S32: Input a pressure holding time setting signal through the console; S33: Input the start signal through the console.

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