Three-section type connecting rod contact surface contact pressure testing system for ship

Abstract

The utility model provides a marine three-section connecting rod contact surface contact pressure test system, and belongs to the technical field of diesel engine detection. Comprising a hydraulic pump device, a test fluid channel is arranged in a three-section connecting rod, an oil outlet of the hydraulic pump device is connected with an oil inlet in one end of the test fluid channel on the three-section connecting rod through a high-pressure fluid delivery pipe, and the other end of the test fluid channel is communicated to a high-pressure contact surface in the three-section connecting rod; the hydraulic pump device supplies high-pressure liquid to the high-pressure contact surface in the three-section type connecting rod through the high-pressure liquid conveying pipe to measure the contact pressure. According to the system, the contact pressure between the contact surfaces of the parts is measured through high-pressure oil, so that the detection system is simple in connection operation, convenient to install and high in numerical value visualization degree, the contact surface pressure measurement efficiency and accuracy can be effectively improved, and a reliable basis is provided for testing and confirming the matching selection and assembly condition of fastening bolts of the three-section type connecting rod for the ship.

Description

Technical Field

[0001] The utility model belongs to the technical field of diesel engine detection, and particularly relates to a contact pressure test system for the contact surface of a marine three-piece connecting rod. Background Technique

[0002] In recent years, with the demand of the shipping industry for the enlargement of ships, marine diesel engines have also developed towards the direction of enlargement and high load. The enlarged diesel engines put forward higher requirements for the convenience of diesel engine disassembly and inspection. The three-piece connecting rod provides a more convenient disassembly and inspection method on the premise of meeting the load requirements, so it is more and more widely used in modern marine diesel engines. The three-piece connecting rod mainly consists of a connecting rod body, an upper bearing cap of the large end of the connecting rod, a lower bearing cap of the large end of the connecting rod, and two groups of fastening bolts and nuts. During the operation of the engine, the connecting rod body, the upper bearing cap of the large end, and the upper and lower bearing caps of the large end are subjected to the combined action of the pre-tightening force of the fastening bolts, the in-cylinder explosion pressure, and the reciprocating inertia force, etc. The force is complex and the working conditions are harsh. Especially, the pre-tightening of the large end of the connecting rod and the upper bearing cap of the large end involves the transportation and sealing of lubricating oil, and the contact pressure of the contact surface under various complex acting forces becomes particularly important. In order to ensure that the contact surfaces do not come off under high pressure and maintain a certain contact pressure, a reliable measurement system is required to measure the contact pressure of each contact surface of the three-piece connecting rod.

[0003] The traditional methods for detecting the contact pressure between component contact surfaces mainly include two methods: pasting strain gauges and pressure-sensitive papers. The strain gauge method evaluates the contact surface pressure by pasting strain gauges around the contact surface, and the pressure-sensitive paper method judges the discoloration of the pressure-sensitive paper by laying the pressure-sensitive paper on the pressure surface to roughly evaluate the pressure of the contact surface. However, in this traditional method for testing the contact surface pressure, using strain gauges to simply evaluate the contact pressure by measuring the material deformation around the contact surface cannot directly measure the pressure at the contact surface and has a large error; the measurement accuracy of the method using pressure-sensitive papers is low, and there are certain limitations for the test range of pressure and the accuracy of estimation, greatly reducing the measurement range. In view of the above existing defects, improvements are proposed. Content of the Utility Model

[0004] The technical problem solved by the utility model: Provide a contact pressure test system for the contact surface of a marine three-piece connecting rod. The purpose of the utility model is to measure the contact pressure between component contact surfaces through high-pressure oil, making the connection operation of the detection system simple, the installation convenient, and the visualization degree of the numerical value high, which can effectively improve the measurement efficiency and accuracy of the contact surface pressure, and provide a reliable basis for the matching selection of the fastening bolts of the marine three-piece connecting rod and the test confirmation of the assembly situation.

[0005] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0006] Marine three - section connecting rod contact surface contact pressure test system, including a hydraulic pump device. There is a test liquid channel in the three - section connecting rod. The oil outlet of the hydraulic pump device is connected to the oil inlet of one end of the test liquid channel on the three - section connecting rod through a high - pressure liquid delivery pipe. The other port of the test liquid channel leads to the high - pressure contact surface in the three - section connecting rod. The hydraulic pump device supplies high - pressure liquid to the high - pressure contact surface in the three - section connecting rod through the high - pressure liquid delivery pipe to measure the contact pressure.

[0007] Further limitation of the above - mentioned scheme: There is a high - pressure liquid pipe joint Ⅰ on the oil inlet of the test liquid channel on the three - section connecting rod, and there is a high - pressure liquid pipe joint Ⅱ on the oil outlet of the hydraulic pump device. The two ends of the high - pressure liquid delivery pipe are respectively connected to the high - pressure liquid pipe joint Ⅰ and the high - pressure liquid pipe joint Ⅱ.

[0008] Further limitation of the above - mentioned scheme: There is a sensor interface on the high - pressure liquid pipe joint Ⅱ, and a hydraulic sensor is connected to the sensor interface.

[0009] Further limitation of the above - mentioned scheme: There are a pressure gauge, a liquid level gauge, a pressure regulating knob and a pressure relief valve in front of the hydraulic pump device.

[0010] Further limitation of the above - mentioned scheme: There is a liquid inlet on the upper part of the hydraulic pump device.

[0011] Further limitation of the above - mentioned scheme: The three - section connecting rod includes a connecting rod body, an upper big - end bearing cap of the connecting rod and a lower big - end bearing cap of the connecting rod. The connecting rod body and the upper big - end bearing cap of the connecting rod are fixedly connected through a fastener between the rod body and the upper big - end bearing cap. The contact surface between the connecting rod body and the upper big - end bearing cap of the connecting rod forms a high - pressure contact surface. The upper big - end bearing cap of the connecting rod and the lower big - end bearing cap of the connecting rod are fixedly connected through a fastener between the upper and lower big - end bearing caps.

[0012] Advantages of the present utility model compared with the prior art:

[0013] 1. For the problems such as difficult test of the contact pressure between the contact surfaces of the connecting rod components and low test accuracy, this scheme proposes to directly and accurately measure the contact pressure by using the high - pressure oil pressure controlled by the hydraulic pump device, simplifies the difficulty of measuring the pressure of the high - pressure contact surface, can significantly improve the accuracy of the contact surface pressure test, the measurement method is simpler, and can greatly improve the efficiency and accuracy, providing a reliable means for the matching selection of the pre - tightening bolts of the three - section connecting rod and the detection of the installation state of the connecting rod.

[0014] 2. In this solution, the contact surface pressure test of the three-section connecting rod is based on the actual pressure of the contact surface. After the contact surface is pre-tightened, the oil supply test can be carried out according to different pressures. The pressure coverage range is not limited by the principle of the test system, and the measurement of the contact pressure is more accurate, which is more in line with the purpose of actual engineering applications. Compared with the pressure-sensitive paper measurement and strain gauge measurement methods in the prior art, it is convenient to install, has a wide measurement range, simple control, and high measurement accuracy;

[0015] 3. The measurement method of this solution system is based on the use purpose of the component, and accurately measures the contact surface pressure of the connecting rod through an indirect method, which can accurately reflect the pressure value between the contact surfaces;

[0016] 4. This solution can not only measure the maximum contact pressure between the contact surfaces, but also detect whether the contact pressure between the contact surfaces meets the use requirements according to the use requirements. At the same time, through the high-pressure pump system, the pressure can be selected according to the specifications of the pressure pump, so it has a variety of measurement methods and a wide measurement range;

[0017] 5. The measurement system of this solution can use an electric pump system, a starting pump system, or a manual pump system; at the same time, a pressure sensor can be added to the system for electronic display and recording of pressure, and the contact pressure can be measured more accurately and intuitively, and the scalability of the system is strong;

[0018] 6. In addition to being applied to the measurement of the contact pressure between the contact surfaces of the three-section connecting rod, the measurement system of this solution can also be used for the test and measurement of the contact pressure between the high-pressure contact surfaces of other similar components. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is a schematic structural diagram of a contact pressure test system for the contact surface of a marine three-section connecting rod provided by the present utility model;

[0020] Figure 2 is a cross-sectional view of the test liquid passage leading to the high-pressure contact surface in the three-section connecting rod of the present utility model. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0021] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present utility model.

[0022] It should be noted that in this text, the terms "comprising", "including" or any other variants thereof are intended to cover non-exclusive inclusion, such that a process, method, article or device comprising a series of elements not only includes those elements but also includes other elements not expressly listed, or elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "comprising one..." does not exclude the presence of additional identical elements in the process, method, article or device comprising said element.

[0023] Please refer to Figure 1-2 , and details of the embodiments of the present utility model will be described.

[0024] Embodiment: A marine three-section connecting rod contact surface contact pressure test system. Refer to Figure 1 as shown, it includes a hydraulic pump device 14. A test liquid passage 9 is provided in the three-section connecting rod 1. Refer to Figure 2 as shown, the oil outlet of the hydraulic pump device 14 is connected to the oil inlet of one end of the test liquid passage 9 on the three-section connecting rod 1 through a high-pressure liquid delivery pipe 10. The other port of the test liquid passage 9 leads to the high-pressure contact surface 7 in the three-section connecting rod 1; the hydraulic pump device 14 supplies high-pressure liquid to the high-pressure contact surface 7 in the three-section connecting rod 1 through the high-pressure liquid delivery pipe 10 to measure the contact pressure.

[0025] In this embodiment, the high-pressure oil pressure controlled by the hydraulic pump device is used to directly and accurately measure the contact pressure, which simplifies the difficulty of measuring the pressure of the high-pressure contact surface, can significantly improve the accuracy of the contact surface pressure test, the measurement method is simpler, and the efficiency and accuracy can be greatly improved, providing a reliable means for the matching selection of the pre-tightening bolts of the three-section connecting rod and the detection of the installation state of the connecting rod.

[0026] In this measurement system, the contact surface pressure test of the three-section connecting rod is based on the actual pressure of the contact surface. After the contact surface is pre-tightened, oil supply tests can be carried out according to different pressures. The pressure coverage range is not limited by the principle of the test system, and the measurement of the contact pressure is more accurate, which is more in line with the purpose of actual engineering applications.

[0027] In addition, the hydraulic pump device in this system can use an electric pump pressure system, a starting pump pressure system, or a manual pump pressure system.

[0028] In a specific embodiment: A high-pressure liquid pipe joint I 8 is provided at the oil inlet of the test liquid passage 9 on the three-section connecting rod 1, and a high-pressure liquid pipe joint II 17 is provided at the oil outlet of the hydraulic pump device 14. Both ends of the high-pressure liquid delivery pipe 10 are respectively connected to the high-pressure liquid pipe joint I 8 and the high-pressure liquid pipe joint II 17. This structure realizes the connection between the hydraulic pump device and the component to be measured, and the structure is simple and easy to implement.

[0029] In a specific embodiment: a sensor interface 18 is provided on the high-pressure liquid pipe joint II 17, and a hydraulic sensor is connected to the sensor interface 18.

[0030] By adding a pressure sensor to this system for electronic display and recording of pressure, the contact pressure can be measured more accurately and intuitively, and the system has strong scalability.

[0031] In a specific embodiment: a pressure gauge 11, a liquid level gauge 13, a pressure regulating knob 15 and a pressure relief valve 16 are provided in front of the hydraulic pump unit 14. An inlet port 12 is provided on the upper part of the hydraulic pump unit 14.

[0032] The above structure is arranged to facilitate the monitoring of the pressure and liquid level during the operation of the hydraulic pump unit and to be able to adjust the hydraulic pressure.

[0033] In a specific embodiment: the three-section connecting rod 1 includes a connecting rod body 2, an upper big-end bearing cap 4 of the connecting rod and a lower big-end bearing cap 5 of the connecting rod; the connecting rod body 2 and the upper big-end bearing cap 4 of the connecting rod are fixedly connected through a rod-body big-end upper-bearing-cap fastener 3, and a high-pressure contact surface 7 is formed on the contact surface between the connecting rod body 2 and the upper big-end bearing cap 4 of the connecting rod; the upper big-end bearing cap 4 of the connecting rod and the lower big-end bearing cap 5 of the connecting rod are fixedly connected through a big-end upper-and-lower-bearing-cap fastener 6.

[0034] In addition to being applied to the measurement of the contact pressure between the contact surfaces of the three-section connecting rod, this measurement system can also be used for the test measurement of the contact pressure between the high-pressure contact surfaces of other similar components.

[0035] When measuring the contact pressure in the three-section connecting rod, as Figure 1 shown, first, each component in the three-section connecting rod 1 of the component to be measured is pre-tightened using fasteners according to the component assembly conditions. Then, the tightened test component is placed on a tensile test bench, and the high-pressure liquid pipe joint I 8 leading to the test liquid channel of the internal contact surface of the component and the high-pressure liquid pipe joint II 17 on the hydraulic pump unit are installed, and the high-pressure liquid delivery pipe 10 between the test three-section connecting rod 1 and the hydraulic pump unit is connected. Apply a corresponding tensile force to the test piece on the tensile test bench according to the test requirements, and then maintain this tensile force. Start the hydraulic pump unit, and pump the pressure of the high-pressure contact surface 7 by closing the pressure regulating knob 15 and the pressure relief valve 16 on the hydraulic pump unit, and observe the change in the pressure indication of the pressure gauge 11 on the system.

[0036] When the pressure indication on the pressure gauge shows an inflection point, an inflection point of the pressure change rate, or there is pressure oil leakage at the contact surface, the pressure at this time is the pressure of the contact surface of the component under the test conditions. When it is required that the contact surface pressure reaches a certain value, pump the pressure to this required pressure value and keep it, and observe whether the pressure drops or there is leakage at the contact surface, then it can be judged whether the pressure at the contact surface meets the requirements.

[0037] This system uses a manual / electric / pneumatic hydraulic pump to supply high-pressure oil to the contact surface of the component through a high-pressure oil pipe to measure the contact pressure. This equipment system is simple to connect and operate, convenient to install, and has a high degree of numerical visualization. It can effectively improve the measurement efficiency and accuracy of the contact surface pressure, and provide a reliable basis for the research, design and optimization of high-pressure contact components.

[0038] For those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and without departing from the spirit or basic characteristics of the present invention, the present invention can be implemented in other specific forms. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present invention. Any reference signs in the claims should not be regarded as limiting the claimed invention.

[0039] In addition, it should be understood that although this specification is described according to embodiments, not every embodiment only contains an independent technical solution. This narrative way of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. Marine three-section connecting rod contact surface contact pressure test system, characterized in that: It includes a hydraulic pump device (14). A test liquid passage (9) is provided in the three-section connecting rod (1). The oil outlet of the hydraulic pump device (14) is connected to the inlet of one end of the test liquid passage (9) on the three-section connecting rod (1) through a high-pressure liquid delivery pipe (10). The other port of the test liquid passage (9) leads to the high-pressure contact surface (7) in the three-section connecting rod (1). The hydraulic pump device (14) supplies high-pressure liquid to the high-pressure contact surface (7) in the three-section connecting rod (1) through the high-pressure liquid delivery pipe (10) to measure the contact pressure.

2. The marine three-section connecting rod contact surface contact pressure testing system according to claim 1, characterized in that: A high-pressure liquid pipe joint Ⅰ (8) is provided at the inlet of the test liquid passage (9) in the three-section connecting rod (1). A high-pressure liquid pipe joint Ⅱ (17) is provided at the oil outlet of the hydraulic pump device (14). The two ends of the high-pressure liquid delivery pipe (10) are respectively connected to the high-pressure liquid pipe joint Ⅰ (8) and the high-pressure liquid pipe joint Ⅱ (17).

3. The marine three-section connecting rod contact surface contact pressure testing system according to claim 2, characterized in that: A sensor interface (18) is provided on the high-pressure liquid pipe joint Ⅱ (17), and a hydraulic sensor is connected to the sensor interface (18).

4. The marine three-stage connecting rod contact surface contact pressure testing system according to claim 1, characterized in that: A pressure gauge (11), a liquid level gauge (13), a pressure regulating knob (15) and a pressure relief valve (16) are provided in front of the hydraulic pump device (14).

5. The marine three-section connecting rod contact surface contact pressure testing system according to claim 1, characterized in that: A liquid inlet (12) is provided at the upper part of the hydraulic pump device (14).

6. The marine three-section connecting rod contact surface contact pressure test system according to claim 1, characterized in that: The three-section connecting rod (1) includes a connecting rod body (2), a connecting rod big-end upper shell (4) and a connecting rod big-end lower shell (5). The connecting rod body (2) and the connecting rod big-end upper shell (4) are fixedly connected through a rod body big-end upper shell fastener (3). The contact surface between the connecting rod body (2) and the connecting rod big-end upper shell (4) forms a high-pressure contact surface (7). The connecting rod big-end upper shell (4) and the connecting rod big-end lower shell (5) are fixedly connected through a big-end upper and lower shell fastener (6).

Images