CN115266047A - A test device and test method for fuel injector spring housing - Google Patents

Abstract

The invention discloses a test device and a test method for a spring housing of an injector, and relates to the technical field of diesel engine testing, which solves the problem that the performance of the spring housing cannot be quantitatively determined, improves the testing efficiency and precision, and ensures the quality of the diesel engine. The scheme is as follows: including a control system, a hydraulic system connected to the control system, a test bench and a man-machine interface, the test bench is provided with a support, the bottom of the support is fixed with a hydraulic cylinder, and the hydraulic cylinder is connected with the hydraulic system , a sliding platform is fixed on the hydraulic rod at the top of the hydraulic cylinder, a number of support seats are fixed on the top of the sliding platform, and a pressure detection mechanism is correspondingly arranged on the top of each support seat, and the pressure detection mechanism is fixed on the top of the bracket, The side part of the bracket is fixedly provided with a position sensor connected with the sliding platform.

Description

A fuel injector spring casing testing device and testing method

technical field

The invention relates to the technical field of diesel engine testing, in particular to a testing device and testing method for a fuel injector spring housing.

Background technique

The statements herein merely provide background information related to the present invention and do not necessarily constitute prior art.

The spring housing is used for fixing the fuel injector and tensioning the chain, etc. where the preload is strictly required. It has the characteristics of high rigidity, strong cushioning and vibration absorption ability, and can withstand large loads with small deformation. The spring housing of the fixed fuel injector can ensure that the compressive stress between the fuel injector and the cylinder head mounting hole is relatively constant regardless of changes in the operator, diesel engine running time and working conditions (such as operating temperature).

The common failure of the spring housing is the reduction of the elastic force. When it fails, a certain cylinder will not inject fuel, the work of the diesel engine will suddenly drop, and the fuel injector will be damaged due to high stress, resulting in abnormal working performance of the diesel engine, and a slowdown or stop alarm. , which will endanger the normal navigation of the ship in severe cases.

The inventor found that a diesel engine cylinder contains several spring housings, and the consistency of the performance of the spring housings in the same cylinder cannot be guaranteed during diesel engine manufacturing or post-maintenance, and when a certain diesel engine cylinder fails, it is impossible to quickly and accurately search for it. Spring shells with performance changes are mostly solved by artificially increasing the pre-tightening force of the spring shells blindly, which may lead to yielding of the force-bearing surface, and in severe cases, gas blow-by in the cylinder.

Contents of the invention

Aiming at the deficiencies in the prior art, the object of the present invention is to provide a fuel injector spring housing testing device and testing method, using the control system to control the action of the reversing valve, and then controlling the action of the test bench to perform static testing on the spring housing. The characteristic test or reliability test solves the problem that the performance of the spring case cannot be quantitatively judged.

In order to achieve the above object, the present invention is achieved through the following technical solutions:

In a first aspect, the present invention provides a fuel injector spring casing test device, including a control system and a hydraulic system connected to the control system, a test bench and a human-computer interaction interface, the test bench is provided with a bracket, and the bracket The bottom of the hydraulic cylinder is fixed with a hydraulic cylinder, the hydraulic cylinder is connected with the hydraulic system, the hydraulic rod on the top of the hydraulic cylinder is fixed with a sliding platform, the top of the sliding platform is fixed with a number of support seats, and the top of each support seat is correspondingly provided with a A pressure detection mechanism, the pressure detection mechanism is fixedly arranged on the top of the bracket, and a position sensor connected to the sliding platform is fixedly installed on the side of the bracket.

As a further implementation, the hydraulic rod is located at the center of the sliding platform, and the support bases are relatively arranged on both sides of the hydraulic rod.

As a further implementation, the support seat is screwed to the sliding platform, and the top of the support seat is provided with a boss that is positioned and connected to the spring housing.

As a further implementation, the pressure detection mechanism is composed of a pressure head and a first pressure sensor, the first pressure sensor is fixedly arranged on the top of the bracket, the bottom of the first pressure sensor is fixedly connected with the pressure head, the first pressure sensor and The position sensors are all connected with the control system.

As a further implementation manner, the first pressure sensor is arranged coaxially with the indenter and the support seat.

As a further implementation, the hydraulic system is provided with a hydraulic oil tank, the oil inlet pipeline and the oil outlet pipeline of the hydraulic oil tank are connected to the hydraulic cylinder through a reversing valve, and the reversing valve is connected to the control system.

As a further implementation, the oil inlet pipeline is sequentially provided with a second filter, a hydraulic oil pump, a check valve, a second pressure sensor, and a first filter in the direction from the end close to the hydraulic oil tank to the end close to the hydraulic cylinder. and accumulators.

As a further implementation, the oil inlet pipeline is also connected with an overflow pipeline, the overflow pipeline communicates with the hydraulic oil tank, an overflow valve is arranged on the overflow pipeline, and a liquid level gauge is arranged in the hydraulic oil tank .

As a further implementation, the control system is provided with a static test module and a reliability test module, which can switch test modes.

In a second aspect, the present invention provides a method for testing a fuel injector spring housing, using the above-mentioned fuel injector spring housing testing device, specifically as follows:

According to the spring case to be tested, select the corresponding indenter and support seat and install them;

Control the upward movement of the sliding platform through the human-computer interaction interface until the lower surface of the indenter contacts the upper surface of the support seat, and mark the position at this time as the initial position;

Control the sliding platform to move down, and install the spring housing to be tested on the supporting base;

Select the test mode on the human-computer interaction interface and conduct the test;

After the test is completed, compare the elastic force-displacement curve or elastic attenuation curve obtained from the test with the design value.

The above-mentioned beneficial effects of the present invention are as follows:

(1) The present invention utilizes the action of control system control test bench to carry out static characteristic test or reliability test to spring casing, to obtain elastic force-displacement curve diagram, can intuitively judge the static characteristic and reliability of spring casing of diesel fuel injector Whether the performance is normal, improve the installed quality of diesel engine parts; it is convenient for turbine management personnel to do maintenance in advance, reduce the risk of diesel engine downtime, and reduce the high cost of blind replacement of new parts during maintenance.

(2) The present invention can test at least two spring housings at the same time, which not only greatly improves the test efficiency, but also can carry out pairing tests with multiple spring housings or compare their test results in combination to select the best spring housing. The close group guarantees the overall quality of the diesel engine.

(3) The present invention is equipped with an accumulator on the oil inlet pipeline, which can suppress the fluctuation of the hydraulic oil when the reversing valve is reversing, and play a role in stabilizing the pressure, so that the working pressure of the hydraulic cylinder is stable to ensure the accuracy of the measurement results. At the same time, the overflow pipeline is connected, which can effectively prevent the overpressure of the oil circuit and avoid the damage of the device.

(4) The hydraulic rod of the present invention is located at the central position of the sliding platform, which can effectively ensure that the sliding platform on both sides of the hydraulic rod is evenly stressed, and then the force of the multiple spring housings is the same, and the first pressure sensor, pressure head, spring The coaxial line arrangement between the housing and the corresponding support seat ensures the accuracy of the measurement results.

Description of drawings

The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention, and the schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations to the present invention.

FIG. 1 is a schematic diagram of the overall structure of a fuel injector spring housing testing device according to one or more embodiments of the present invention;

Fig. 2 is a schematic structural diagram of a test bench according to one or more embodiments of the present invention;

Fig. 3 is a structural schematic diagram of a hydraulic system according to one or more embodiments of the present invention;

In the figure: The distance or size between each part is exaggerated to show the position of each part, and the schematic diagram is for illustration only;

Among them, 1. Hydraulic system; 2. Test bench; 3. Human-machine interface; 4. Control system; 5. First pressure sensor; 6. Pressure head; 7. Spring shell; 8. Support seat; 9. Position Sensor; 10, sliding platform; 11, hydraulic cylinder; 12, bracket; 13, limit block; 14, first filter; 15, accumulator; 16, reversing valve; 17, overflow valve; 18, liquid 19. Hydraulic oil tank; 20. Second filter; 21. Hydraulic oil pump; 22. Check valve; 23. Second pressure sensor.

Detailed ways

It should be noted that the following detailed description is exemplary and intended to provide further explanation of the present invention. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.

As introduced in the background technology, during the manufacture of diesel engine oil and subsequent maintenance, the performance of the spring housing in the same cylinder cannot be guaranteed to be consistent. When a certain diesel engine cylinder fails, it is impossible to quickly and accurately find out the spring housing whose performance has changed. Most of them are solved by artificially increasing the pre-tightening force of the spring shell, which may lead to yielding of the force-bearing surface, and in severe cases, the problem of gas blow-by in the cylinder will be caused. In order to solve the above technical problems, the present invention proposes a fuel injection The invention relates to a testing device and a testing method for a device spring housing.

Example 1

In a typical implementation of the present invention, as shown in Figures 1-3, a fuel injector spring housing testing device is proposed, including a hydraulic system 1, a test bench 2, a man-machine interface 3 and a control system 4. Among them, the control system 4 is respectively connected with the hydraulic system 1, the test bench 2 and the man-machine interface 3.

As shown in Figure 2, the test bench 2 is composed of a first pressure sensor 5, a pressure head 6, a support seat 8, a position sensor 9, a sliding platform 10, a hydraulic cylinder 11, a bracket 12 and a limit block 13, wherein the bracket 12 is The main support components and functional components are all arranged on the bracket 12 .

Specifically, the bottom and top of the support 12 are closed by plates, the hydraulic cylinder 11 is fixed vertically on the plate at the bottom of the support 12, the telescopic rod at the top of the hydraulic cylinder 11 is fixedly connected to the sliding platform 10, and both sides of the sliding platform 10 are Slidingly connected with the side wall of the bracket 12, so that the sliding platform 10 can be driven to reciprocate vertically in the bracket 12 through the expansion and contraction of the hydraulic rod;

Wherein, the hydraulic rod is located at the center of the sliding platform 10 to ensure that the force on both sides of the sliding platform 10 is even.

Both sides of support 12 are also provided with limit block 13, each side limit block 13 is all provided with two, and two limit block 13 is arranged up and down oppositely, is used for limiting the moving distance of sliding platform 10, to prevent sliding The platform 10 overtravels causing component damage.

The top of the sliding platform 10 is fixedly provided with a number of support seats 8, and the support seats 8 are relatively arranged on both sides of the hydraulic rod, and the number of the support seats 8 on both sides of the hydraulic rod is the same. For ease of understanding, this embodiment uses two support seats 8 as an example.

The two support bases 8 are fixedly arranged on the sliding platform 10, and the two support bases 8 are relatively arranged on both sides of the hydraulic rod, so that when the hydraulic cylinder 11 exerts force on the sliding platform 10, it can ensure that the two support bases 8 are stressed. Equal, since a fuel injector contains at least two spring housings 7, multiple sets of support seats 8 with the same design can improve detection efficiency and can also optimally match the performance of multiple spring housings 7 to ensure that each fuel injector The working performance is as far as possible the same.

Wherein, the position where the sliding platform 10 is used to install the support base 8 is provided with a mounting hole, the mounting hole is provided with an internal thread, the bottom of the support base 8 is provided with an external thread, and the support base 8 and the sliding platform 10 are threaded. Fixed connection, so that when the specifications of the spring housing 7 to be tested are different, the support base 8 can be replaced to meet the test requirements. The top of the support base 8 has a boss, and the positioning connection with the spring housing 7 can be realized through the boss .

The top of each supporting base 8 is correspondingly provided with a pressure detection mechanism, the pressure detection mechanism is composed of a pressure head 6 and a first pressure sensor 5, wherein, the first pressure sensor 5 is fixedly arranged below the top plate of the bracket 12, the second The bottom of a pressure sensor 5 is fixedly connected with the pressure head 6 for pressure detection.

In practical application, the spring housing 7 is placed on the top of the support base 8, at this time, the spring housing 7 is located between the support base 8 and the indenter 6, the first pressure sensor 5, the indenter 6, the spring housing 7 and Corresponding support bases 8 are coaxially arranged, and when the sliding platform 10 moves upward, the top of the spring housing 7 will be in contact with the pressure head 6 and squeezed, so that the spring housing 7 and the pressure head 6 will be pressed against each other by using the first pressure sensor 5 . The pressure between the heads 6 is detected, ie the reaction force of the spring housing 7 .

Through the above arrangement, at least two spring casings 7 can be tested at the same time, which greatly improves the test efficiency, and can also be optimized to ensure the overall quality of the diesel engine.

The side of support 12 is also fixedly provided with a position sensor 9, and position sensor 9 is arranged vertically, and the measuring bar of position sensor 9 is fixedly connected with slide platform 10, can extend or shorten along with the movement of slide platform 10, with real-time feedback The position of the sliding platform 10.

Wherein, both the first pressure sensor 5 and the position sensor 9 are connected with the control system 4 to display the measured pressure value and displacement value through the man-machine interface 3 .

As shown in Figure 3, the hydraulic system consists of a first filter 14, an accumulator 15, a reversing valve 16, an overflow valve 17, a liquid level gauge 18, a hydraulic oil tank 19, a second filter 20, a hydraulic oil pump 21, a single Composed of directional valve 22 and second pressure sensor 23;

Wherein, the hydraulic oil tank 19 is connected with the hydraulic cylinder 11 through the oil inlet pipeline and the oil outlet pipeline respectively. The hydraulic oil for driving the hydraulic cylinder 11 is housed in the hydraulic oil tank 19. connected so that the oil inlet pipeline can supply oil to the upper chamber or lower chamber of the hydraulic cylinder 11 alone, and finally return the depressurized hydraulic oil to the hydraulic oil tank 19 through the oil outlet pipeline.

It can be understood that, in order to achieve the above purpose, the reversing valve 16 can be a three-position, four-way electromagnetic reversing valve.

On the oil inlet pipeline, a second filter 20, a hydraulic oil pump 21, a check valve 22, a second pressure sensor 23, a first filter 14 and accumulator 15;

Among them, the function of the hydraulic oil pump 21 is to pump the hydraulic oil into the hydraulic cylinder 11. The first filter 14 and the second filter 20 are used for filtering the hydraulic oil. The sensor 14 can suppress the fluctuation of the hydraulic oil when the reversing valve 16 is reversing, and play the role of stabilizing the pressure to ensure the accuracy of the measurement results. The second pressure sensor 23 is used to detect the inlet pressure of the hydraulic oil in the oil inlet pipeline .

The hydraulic oil tank 19 is provided with a liquid level gauge 18, which is used to detect the hydraulic oil level in the hydraulic oil tank 19; an overflow pipeline is also connected to the oil inlet pipeline, and the overflow pipeline is also connected with the hydraulic oil tank 19. An overflow valve 17 is provided on the pipeline, which can effectively prevent overpressure of the oil circuit.

The second pressure sensor 23, the hydraulic oil pump 21 and the reversing valve 16 are all connected to the control system 4, and the control system 4 can be based on the received pressure, reaction force and displacement information, as well as the initial parameters set by the tester through the man-machine interface 3 , control the start and stop of the hydraulic oil pump 21 in the hydraulic system 1, and drive the movement of the sliding platform 10 by controlling the work switching of the upper and lower electromagnetic valves of the reversing valve 16.

The human-computer interaction interface 3 is a control panel, which is connected with the control system 4, and its purpose is to monitor and control the working status of the entire test device, display, store and print the test results in charts, and set the initial test conditions.

Among them, the control system 4 is provided with a static test module and a reliability test module, which can perform selection control of the static test or the reliability test. When performing the static test, you can choose whether to follow the pressure mode or the displacement mode through the man-machine interface 3 , the pressure mode corresponds to detecting the displacement of the spring housing 7 under a given pressure; the displacement mode corresponds to detecting the magnitude of the elastic force when the spring housing 7 is compressed to a specified distance, and the static state of the spring housing 7 can be obtained. Precise elastic force-displacement relationship;

During the reliability test, the number or time of dynamic tests, the action frequency, the initial prestress or the size of the initial displacement can be flexibly set through the man-machine interface 3, so as to test the reliability of the spring housing 7 .

Example 2

In another typical implementation of the present invention, a method for testing a fuel injector spring housing is proposed, using the testing device described in Example 1, and the specific process is as follows:

According to the spring housing 7 to be tested, select the corresponding indenter 6 and support seat 8; screw the indenter 6 into the threaded hole of the first pressure sensor 5, and in the same way, screw the support seat 8 into the sliding platform 10 in the mounting hole;

Close the power supply of the control system 4, and now the hydraulic oil pump 21 in the hydraulic system 1 starts running;

Control the upward movement of the sliding platform 10 through the human-computer interaction interface 3 until the lower surface of the indenter 6 just contacts the upper surface of the support seat 8, and mark the position at this time as the initial position;

After the initial position calibration is completed, the sliding platform 10 is manipulated to move down through the man-machine interface 3, and several spring housings 7 to be tested are correspondingly installed on the matching support bases 8. Between the spring housing 7 and the support base 8 Reliable positioning through the boss;

Select whether the test mode is static test or reliability test on the human-computer interaction interface 3. If it is a static test, you also need to choose whether to follow the pressure mode or the displacement mode. After the mode is selected, the control system 4 automatically controls the test device and the hydraulic device. Work;

Wherein, the pressure mode corresponds to detecting the displacement of the spring housing 7 under a given pressure; the displacement mode corresponds to detecting the magnitude of the elastic force when the spring housing 7 is compressed to a specified distance; if the reliability test is selected, It is necessary to set the number or time of test actions, action frequency, initial prestress or initial displacement, so that the spring housing 7 is compressed and stretched at a given frequency, so as to monitor the change of the performance of the spring housing 7 with the length of service.

During the pumping process of hydraulic oil, the hydraulic oil pump 21 sucks hydraulic oil from the hydraulic oil tank 19, and the pressurized hydraulic oil reaches the reversing valve 16 through the check valve 22 and the first filter 14. When the reversing valve 16 When the lower solenoid valve is energized, the hydraulic oil enters the lower chamber of the hydraulic cylinder 11, and the hydraulic rod of the hydraulic cylinder 11 drives the sliding platform 10 to move upward; when the upper solenoid valve of the reversing valve 16 is energized, the hydraulic oil enters the hydraulic cylinder 11 The upper cavity of the hydraulic cylinder drives the sliding platform 10 to move down;

Click to start the test on the human-computer interaction interface 3, and wait for the test to complete;

Comparing the elastic force-displacement curve or elastic force attenuation curve obtained by the test with the design value, it can be obtained whether the static characteristics and reliability of the tested spring housing 7 are normal; multiple spring housings 7 are paired for testing or their If the test results are combined and compared, the group with the closest performance can be selected.

Through the above operations, it is possible to more intuitively judge whether the spring housing of the marine low-speed diesel engine fuel injector is normal, improve the quality of diesel engine parts; facilitate the maintenance of the engine management personnel in advance, reduce the risk of diesel engine shutdown; reduce blind replacement during maintenance High cost of new parts.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and changes. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims (10)

1. The utility model provides a sprayer spring housing testing arrangement, its characterized in that includes control system and the hydraulic system, testboard and the human-computer interaction interface who are connected with control system, the testboard is equipped with the support, the fixed pneumatic cylinder that is equipped with in bottom of support, the pneumatic cylinder is connected with hydraulic system, fixes being equipped with sliding platform on the hydraulic cylinder top hydraulic stem, and sliding platform's top is fixed to be equipped with a plurality of supporting seats, and the top correspondence of every supporting seat is equipped with a pressure measurement mechanism, pressure measurement mechanism is fixed to be set up at the top of support, and the fixed position sensor who is connected with sliding platform that is equipped with of lateral part of support.

2. The fuel injector spring case testing device according to claim 1, wherein the hydraulic rod is located at a center of the sliding platform, and the supporting seats are oppositely arranged on two sides of the hydraulic rod.

3. The fuel injector spring housing testing device according to claim 1, wherein the supporting seat is in threaded connection with the sliding platform, and a boss in positioning connection with the spring housing is arranged at the top of the supporting seat.

4. The fuel injector spring housing testing device according to claim 1, characterized in that the pressure detection mechanism is composed of a pressure head and a first pressure sensor, the first pressure sensor is fixedly arranged at the top of the support, the bottom of the first pressure sensor is fixedly connected with the pressure head, and the first pressure sensor and the position sensor are both connected with the control system.

5. The fuel injector spring case testing device of claim 4, wherein the first pressure sensor is coaxially disposed with the ram and the support base.

6. The fuel injector spring shell testing device according to claim 1, characterized in that the hydraulic system is provided with a hydraulic oil tank, an oil inlet pipeline and an oil outlet pipeline of the hydraulic oil tank are connected with the hydraulic cylinder through a reversing valve, and the reversing valve is connected with a control system.

7. The fuel injector spring shell testing device according to claim 6, wherein a second filter, a hydraulic oil pump, a one-way valve, a second pressure sensor, a first filter and an energy accumulator are sequentially arranged on the fuel inlet pipeline from one end close to the hydraulic oil tank to one end close to the hydraulic cylinder.

8. The fuel injector spring shell testing device according to claim 6, characterized in that an overflow pipeline is further connected to the fuel inlet pipeline, the overflow pipeline is communicated with a hydraulic fuel tank, an overflow valve is arranged on the overflow pipeline, and a liquid level meter is arranged in the hydraulic fuel tank.

9. The fuel injector spring housing testing device according to claim 1, characterized in that a static testing module and a reliability testing module are arranged in the control system, and the testing modes can be switched.

10. A fuel injector spring housing testing method, characterized by using a fuel injector spring housing testing device according to any one of claims 1-9, specifically as follows:

selecting a corresponding pressure head and a corresponding support seat according to the spring shell to be tested and installing;

controlling the sliding platform to move upwards through a human-computer interaction interface until the lower surface of the pressure head is contacted with the upper surface of the supporting seat, and calibrating the position at the moment as an initial position;

controlling the sliding platform to move downwards, and correspondingly installing the spring shell to be tested on the supporting seat;

selecting a test mode on a human-computer interaction interface, and testing;

and after the test is finished, comparing the elastic force-displacement curve or the elastic force attenuation curve obtained by the test with a design value.

Images