Reciprocating engine piston fatigue test device

Abstract

The invention discloses a reciprocating engine piston fatigue test device, and relates to the technical field of piston fatigue tests.The reciprocating engine piston fatigue test device comprises a box body, a heater is fixedly installed at the top end of the box body, a sleeve cylinder is movably installed on the inner side face of a support, and an installation mechanism is arranged on the inner side face of the support; a protective shell is fixedly installed on the outer surface of the support, and a detection mechanism is arranged between the protective shell and the signal receiver. A piston body is movably installed on the inner side face of the sleeve cylinder, and an adjusting mechanism is arranged between the output shaft and the piston body. According to the reciprocating engine piston fatigue test device, the stepping motor works to drive the output shaft to rotate, the output shaft drives the adjusting mechanism to perform reciprocating operation on the piston body, so that a fatigue test is performed on the piston body, the detection mechanism is utilized to record the frequency of the piston body, and the wear resistance of the piston body is conveniently detected; and the sleeve cylinder is quickly replaced through the arranged mounting mechanism, so that the influence on the detection efficiency caused by manual disassembly of the sleeve cylinder is avoided.

Description

Technical Field

[0001] The invention relates to the technical field of piston fatigue testing, in particular to a reciprocating engine piston fatigue testing device. Background Art

[0002] The engine piston is one of the indispensable parts of a car engine. The reciprocating motion of the piston is converted into the rotational motion of the crankshaft, which outputs the effect to the outside. The connecting rod is subjected to the periodic action of alternating loads during operation. Therefore, high requirements are placed on the stiffness and strength of the piston. It is necessary to conduct random inspections on products of the same batch and perform fatigue tests on them.

[0003] However, the existing piston fatigue test device performs high temperature resistance test on the piston by directly heating it during use, but the heat cannot heat the piston uniformly, which affects the test data and reduces the practicality of the device.

[0004] To address the above-mentioned drawbacks, in the prior art, Chinese Patent Publication No. CN211824977U discloses a universal fatigue test device for engine pistons, comprising a pressure-bearing cylinder, an oil pipeline, and an oil nozzle. The pressure-bearing cylinder is provided with the oil pipeline along its inner wall, and the oil pipeline is connected to the pressure-bearing cylinder by a snap fastener. Piston sleeves are provided on both the left and right inner walls of the pressure-bearing cylinder, and the piston sleeves are connected to the pressure-bearing cylinder by screws. A fixing pin is provided on one side wall of the piston sleeve, and the fixing pin is plugged into the piston sleeve. The oil pipeline is provided with the oil nozzle, and the oil nozzle is connected to the oil pipeline by screws. By laying the oil pipeline along the inner wall of the pressure-bearing cylinder, the pressure-bearing cylinder and, in turn, the piston are heated evenly, thereby improving the accuracy of the test data and the practicality of the device. By providing a regulating valve, the opening of the connecting pipeline can be adjusted, thereby adjusting the amount of oil injection. This can simulate the effect of a sudden increase in the internal temperature of the cylinder caused by the throttle opening in real life on the piston, thereby improving the functionality of the device.

[0005] In the prior art, Chinese patent publication number CN221404680U discloses an engine piston fatigue test device, which includes a base, a support plate and a drive motor. Two support plates are fixedly installed on the top of the base, and a drive motor is installed on one side of the support plate. It also includes a rotating disk, a connecting rod, a piston body, a cylinder body, a fixing mechanism, a connecting rod body and a mounting mechanism. The top of the top plate is fixedly installed on the surface of the cylinder body. The tops of the four guide rods all pass through the top of the top plate and are threadedly installed with fastening bolts. The connecting rod bolts pass through the mounting holes of the connecting rod cover and the bottom of the connecting rod body and are threadedly installed, thereby facilitating the loading and unloading of the connecting rod body and the piston body. According to the different specifications of the piston body, the corresponding cylinder body is replaced, the surface hole portion of the top plate is installed on the four guide rods, and the top plate is fixed to the top of the two support plates with fastening bolts. Starting the drive motor drives the output end rotating disk to rotate, and drives the connecting rod to rotate, thereby driving the connecting rod body to swing, and realizing the reciprocating motion of the piston body in the cylinder body for testing.

[0006] During use, the above-mentioned device uses a connecting rod bolt to disassemble and assemble the connecting rod body, thereby facilitating the detection of pistons of different specifications. However, the cylinder body in the above-mentioned device will be worn by the piston during detection. In order to avoid affecting the detection results, the cylinder body needs to be continuously replaced. Manual disassembly of the cylinder body is relatively cumbersome, which affects the detection efficiency of the equipment. Summary of the Invention

[0007] The object of the present invention is to provide a reciprocating engine piston fatigue test device to solve the problem of low efficiency of manual disassembly and assembly of the cylinder body mentioned in the background art.

[0008] To achieve the above-mentioned objectives, the present invention provides the following technical solutions: a reciprocating engine piston fatigue test device, comprising a box body, a heater fixedly mounted on the top of the box body, an observation window movably mounted on the inner side surface of the box body, a bracket fixedly mounted on the inner side surface of the box body, a sleeve cylinder movably mounted on the inner side surface of the bracket, and a quick-change mounting mechanism provided on the inner side surface of the bracket; a protective shell fixedly mounted on the outer surface of the bracket, a signal receiver provided below the protective shell, and a detection mechanism for recording frequency provided between the protective shell and the signal receiver; an output shaft rotatably mounted on the inner side surface of the bracket, a piston body movably mounted on the inner side surface of the sleeve cylinder, and a reciprocating adjustment mechanism provided between the output shaft and the piston body.

[0009] Furthermore, a stepper motor is fixedly mounted on the outer surface of the box, an output shaft is rotatably mounted on the output end of the stepper motor, a cam 1 is fixedly mounted on the outer surface of the output shaft, and the output shaft and the cam 1 form a rotating structure.

[0010] Furthermore, the adjustment mechanism includes a piston body, which is movably abutted against one side of cam one, and the other side of the piston body is movably abutted against cam two, and a driving rod is fixedly mounted on the outer surface of cam two.

[0011] Furthermore, a positioning rod is provided on the inner side surface of the cam 1, a fastening bolt is provided on the inner side surface of the cam 2, and the cam 1 and the positioning rod are fixedly connected to the positioning rod via the fastening bolt.

[0012] Furthermore, a belt is rotatably mounted on the outer surface of the driving rod, a pulley is movably mounted on the inner side of the belt, a curved rod is fixedly mounted on the outer surface of the pulley, a protective shell is movably mounted on the outer surface of the pulley, and the belt and pulley form a rotating structure.

[0013] Furthermore, the detection mechanism includes a pressing rod, which is fixedly mounted on the outer surface of the curved rod, a buffer spring is fixedly mounted on the outer surface of the pressing rod, a pressing plate is fixedly mounted on the outer surface of the buffer spring, the pressing plate is fixedly mounted on the top of the signal receiver, and the pressing rod and the buffer spring form a telescopic structure.

[0014] Furthermore, a hydraulic pump is fixedly mounted on the inner end of the bracket, a telescopic rod is movably mounted on the outer surface of the hydraulic pump, a positioning plate is fixedly mounted on the outer surface of the telescopic rod, and the telescopic rod and the positioning plate form a telescopic structure.

[0015] Furthermore, a compression spring is fixedly mounted on the inner side surface of the telescopic rod, a connecting rod is fixedly mounted on the outer surface of the compression spring, and a positioning plate is movably mounted on the outer surface of the connecting rod.

[0016] Furthermore, the mounting mechanism includes a clamping plate, which is fixedly mounted on the outer surface of the positioning plate, the outer surface of the clamping plate is movably abutted against a sleeve cylinder, and the clamping plate is movably mounted on the inner side of the bracket, and a detector is fixedly mounted on the inner side of the bracket.

[0017] Furthermore, a limiting rod is fixedly installed on the outer surface of the clamping plate close to the positioning plate, and the limiting rod is movably installed on the inner side surface of the positioning plate.

[0018] Compared with the prior art, the present invention has the following beneficial effects: (1) The output shaft is driven by the stepper motor to rotate, and the output shaft drives the adjustment mechanism to reciprocate the piston body, thereby performing fatigue testing on the piston body. The frequency of the piston body is recorded by the detection mechanism, which facilitates the detection of the wear resistance of the piston body. The installation mechanism is used to achieve rapid replacement of the cylinder sleeve, avoiding manual disassembly of the cylinder sleeve to affect the detection efficiency; (2) The interior of the box is evenly heated by the heater installed on the top, and the heat is transferred to the inside of the box through the installed connecting pipes, which is convenient for testing the high temperature resistance of the piston body in a high temperature environment. The installed switchable observation window is used to observe the condition inside the box, which is convenient for personnel to detect and install. The control panel installed on the box simplifies the operation of personnel and reduces the workload of personnel; (3) By starting the stepper motor, the stepper motor drives the output shaft to rotate, the output shaft drives the cam 1 to rotate, and the cam 1 drives the piston body to move back and forth inside the cylinder for testing, and manually insert the positioning rod into the slots opened in the cam 1, the piston body and the cam 2, and fix it with the fastening bolts, so as to realize the coaxial rotation of the cam 1, the piston body and the cam 2, thereby increasing the stability of the test; (4) The driving rod is driven to rotate by the second cam, and the driving rod drives the belt to rotate. The pulley adapted to the belt is used to prevent the belt from slipping. The pulley drives the crankshaft to rotate, and the crankshaft drives the pressing rod to move up and down. The protective shell is used to protect the transmission belt and other components, thereby improving the safety of the equipment. (5) The pressing rod is driven to move up and down by the curved rod, and the pressing rod presses the pressing plate, and the buffer spring is used to alleviate the impact. The pressing plate transmits the pressing frequency to the signal receiver, and the signal receiver is an existing technology, which is not elaborated in detail in this scheme. The collected data is then transmitted to the controller installed in the box, which is convenient for personnel to monitor the reciprocating frequency of the piston body in real time and to detect the wear resistance of the piston body, thereby ensuring that the service life of the piston body is within the qualified range and the quality of the piston body meets the standards. The detector set is used to facilitate real-time monitoring of the internal piston body. The detector is an infrared detector, which is convenient for detecting the surface temperature of the piston body, thereby improving the accuracy of the detection; (6) The observation window is opened manually, and the cylinder to be installed is installed on the bracket. The hydraulic pump drives the telescopic rod to move the connecting rod, and the connecting rod drives the clamping plate to clamp and fix the cylinder. The clamping plate is provided with two sets of symmetrical plates, and the wear of the clamping plate on the surface of the cylinder is relieved by pressing the spring. The positioning plate is used to limit the limit rod, thereby realizing the rapid replacement of the cylinder and facilitating the replacement of the corresponding cylinder according to the size of the different piston body specifications. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the cross-sectional structure of the box body of the present invention; Figure 3 This is a schematic diagram of the three-dimensional structure of the bracket of the present invention; Figure 4 This is a schematic diagram of the three-dimensional structure of the piston body of the present invention; Figure 5 This is a schematic diagram of the three-dimensional structure of the cam of the present invention; Figure 6 This is a schematic diagram of the three-dimensional structure of the cam 2 of the present invention; Figure 7 This is a schematic diagram of the three-dimensional structure of the fastening bolt of the present invention; Figure 8 This is a schematic diagram of the three-dimensional structure of the pressing rod of the present invention; Figure 9 This is a schematic diagram of the three-dimensional structure of the positioning plate of the present invention; Figure 10 It is a schematic diagram of the cross-sectional structure of the clamping plate of the present invention.

[0020] In the figure: 1. Box body; 2. Heater; 3. Observation window; 4. Stepper motor; 5. Output shaft; 6. Cam 1; 7. Piston body; 8. Cam 2; 9. Drive rod; 10. Positioning rod; 11. Fastening bolt; 12. Belt; 13. Pulley; 14. Crank rod; 15. Protective shell; 16. Press rod; 17. Buffer spring; 18. Press plate; 19. Signal receiver; 20. Bracket; 21. Cylinder; 22. Hydraulic pump; 23. Telescopic rod; 24. Positioning plate; 25. Press spring; 26. Connecting rod; 27. Clamping plate; 28. Limit rod; 29. Detector. DETAILED DESCRIPTION

[0021] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0022] Example 1: Please refer to Figure 1-Figure 3 The present invention provides the following technical solutions: a reciprocating engine piston fatigue test device, comprising a box body 1, a heater 2 is fixedly mounted on the top of the box body 1, an observation window 3 is movably mounted on the inner side surface of the box body 1, a bracket 20 is fixedly mounted on the inner side surface of the box body 1, a sleeve cylinder 21 is movably mounted on the inner side surface of the bracket 20, and a quick-change mounting mechanism is provided on the inner side surface of the bracket 20; a protective shell 15 is fixedly mounted on the outer surface of the bracket 20, a signal receiver 19 is provided below the protective shell 15, and a detection mechanism for recording frequency is provided between the protective shell 15 and the signal receiver 19; an output shaft 5 is rotatably mounted on the inner side surface of the bracket 20, a piston body 7 is movably mounted on the inner side surface of the sleeve cylinder 21, and a reciprocating adjustment mechanism is provided between the output shaft 5 and the piston body 7.

[0023] The interior is evenly heated by the heater 2 installed on the top of the box body 1, and the heat is transferred to the interior of the box body 1 through the installed connecting pipes, which is convenient for detecting the high-temperature resistance test of the piston body 7 in a high-temperature environment. The installed switchable observation window 3 is used to observe the condition inside the box body 1, which is convenient for personnel to detect and install. The control panel installed on the box body 1 simplifies the operation of personnel and reduces the workload of personnel. The output shaft 5 is driven to rotate by the stepping motor 4, and the output shaft 5 drives the adjusting mechanism to reciprocate the piston body 7, thereby performing a fatigue test on the piston body 7. The frequency of the piston body 7 is recorded by the set detection mechanism, which is convenient for detecting the wear resistance of the piston body 7. The set installation mechanism can realize rapid replacement of the cylinder sleeve 21, avoiding manual disassembly of the cylinder sleeve 21 to affect the efficiency of detection.

[0024] Example 2: Based on Example 1, please refer to Figure 2-Figure 8 , a piston body 7 is also disclosed, and its specific structure is as follows: a stepper motor 4 is fixedly mounted on the outer surface of the box body 1, and an output shaft 5 is rotatably mounted on the output end of the stepper motor 4, a cam 6 is fixedly mounted on the outer surface of the output shaft 5, and the output shaft 5 and the cam 6 form a rotating structure, the adjusting mechanism includes a piston body 7, the piston body 7 is movably abutted on one side of the cam 6, and the other side of the piston body 7 is movably abutted on the cam 2 8, and a driving rod 9 is fixedly mounted on the outer surface of the cam 2 8, a positioning rod 10 is provided on the inner side surface of the cam 6, a fastening bolt 11 is provided on the inner side surface of the cam 2 8, and the cam 6 and the positioning rod 10 are fixedly connected to the positioning rod 10 by the fastening bolt 11, a belt 12 is rotatably mounted on the outer surface of the driving rod 9, a pulley 13 is movably mounted on the inner side surface of the belt 12, a curved rod 14 is fixedly mounted on the outer surface of the pulley 13, a protective shell 15 is movably mounted on the outer surface of the pulley 13, and the belt 12 and the pulley 13 form a rotating structure.

[0025] By starting the stepper motor 4, the stepper motor 4 drives the output shaft 5 to rotate, the output shaft 5 drives the cam 6 to rotate, and the cam 6 drives the piston body 7 to reciprocate inside the cylinder 21 for testing, and the positioning rod 10 is manually inserted into the slots provided by the cam 6, the piston body 7 and the cam 2 8, and fixed with the fastening bolt 11, so as to realize the coaxial rotation of the cam 6, the piston body 7 and the cam 2 8, thereby increasing the stability of the test, and the driving rod 9 is driven to rotate by the cam 2 8, and the driving rod 9 drives the belt 12 to rotate, and the pulley 13 adapted to the belt 12 is used to prevent the belt 12 from slipping, and the pulley 13 drives the curved rod 14 to rotate, and the curved rod 14 drives the pressing rod 16 to reciprocate up and down, and the protective shell 15 is used to protect the transmission belt 12 and other components, thereby improving the safety of the equipment.

[0026] Example 3: Based on Example 1, please refer to Figure 4-10, also discloses a clamping plate 27, whose specific structure is as follows: the detection mechanism includes a pressing rod 16, the pressing rod 16 is fixedly mounted on the outer surface of the bent rod 14, the outer surface of the pressing rod 16 is fixedly mounted with a buffer spring 17, the outer surface of the buffer spring 17 is fixedly mounted with a pressing plate 18, the pressing plate 18 is fixedly mounted on the top of the signal receiver 19, and the pressing rod 16 and the buffer spring 17 form a telescopic structure, the inner end of the bracket 20 is fixedly mounted with a hydraulic pump 22, the outer surface of the hydraulic pump 22 is movably mounted with a telescopic rod 23, the outer surface of the telescopic rod 23 is fixedly mounted with a positioning plate 24, and the telescopic rod 23 and the positioning plate 24 form a telescopic structure. Telescopic structure, the inner side surface of the telescopic rod 23 is fixedly installed with a pressing spring 25, the outer surface of the pressing spring 25 is fixedly installed with a connecting rod 26, the outer surface of the connecting rod 26 is movably installed with a positioning plate 24, the installation mechanism includes a clamping plate 27, the clamping plate 27 is fixedly installed on the outer surface of the positioning plate 24, the outer surface of the clamping plate 27 is movably abutted against the sleeve cylinder 21, and the clamping plate 27 is movably installed on the inner side surface of the bracket 20, and the inner side surface of the bracket 20 is fixedly installed with a detector 29, the clamping plate 27 is fixedly installed with a limiting rod 28 on the outer surface close to the positioning plate 24, and the limiting rod 28 is movably installed on the inner side surface of the positioning plate 24.

[0027] The pressing rod 16 is driven to move up and down by the curved rod 14, and the pressing rod 16 presses the pressing plate 18, and the buffer spring 17 is used to alleviate the impact. The pressing plate 18 transmits the pressing frequency to the signal receiver 19, and the signal receiver 19 is a prior art and is not elaborated in detail in this solution. The collected data is then transmitted to the controller installed in the box body 1, which is convenient for personnel to monitor the reciprocating frequency of the piston body 7 in real time, and to detect the anti-wear performance of the piston body 7, thereby ensuring that the service life of the piston body 7 is within the qualified range and the quality of the piston body 7 is up to standard. The detector 29 is provided to facilitate real-time monitoring of the internal piston body 7. The detector 29 is an infrared detector, which is convenient for detecting the surface temperature of the piston body 7, thereby improving the accuracy of the detection. The observation window 3 is manually opened, and the cylinder 21 to be installed is installed on the bracket. The telescopic rod 23 is driven by the hydraulic pump 22 to drive the connecting rod 26 to move. The connecting rod 26 drives the clamping plate 27 to clamp and fix the cylinder 21. The clamping plate 27 is provided with two sets of symmetrical ones, and the wear of the clamping plate 27 on the surface of the cylinder 21 is alleviated by pressing the spring 25. The positioning plate 24 is used to limit the limit rod 28, thereby realizing rapid replacement of the cylinder 21 and conveniently replacing the corresponding cylinder 21 according to the size of the different piston bodies 7.

[0028] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "connected" and "connection" should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integral connection; mechanical connection, electrical connection; direct connection, or indirect connection through an intermediary. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0029] Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A reciprocating engine piston fatigue test device, comprising a box (1), a heater (2) fixedly mounted on the top of the box (1), characterized in that: An observation window (3) is movably mounted on the inner side of the box (1), a bracket (20) is fixedly mounted on the inner side of the box (1), a sleeve cylinder (21) is movably mounted on the inner side of the bracket (20), and a quick-change mounting mechanism is provided on the inner side of the bracket (20); A protective shell (15) is fixedly mounted on the outer surface of the bracket (20), a signal receiver (19) is provided below the protective shell (15), and a detection mechanism for recording frequency is provided between the protective shell (15) and the signal receiver (19); An output shaft (5) is rotatably mounted on the inner side of the bracket (20), a piston body (7) is movably mounted on the inner side of the sleeve cylinder (21), and a reciprocating adjustment mechanism is provided between the output shaft (5) and the piston body (7).

2. A reciprocating engine piston fatigue testing device according to claim 1, characterized in that: A stepper motor (4) is fixedly mounted on the outer surface of the box body (1); an output shaft (5) is rotatably mounted on the output end of the stepper motor (4); a cam (6) is fixedly mounted on the outer surface of the output shaft (5); and the output shaft (5) and the cam (6) form a rotating structure.

3. The reciprocating engine piston fatigue testing device according to claim 1, characterized in that: The regulating mechanism comprises a piston body (7), wherein the piston body (7) is movably in contact with one side of the cam 1 (6), and the other side of the piston body (7) is movably in contact with the cam 2 (8), and a driving rod (9) is fixedly mounted on the outer surface of the cam 2 (8).

4. The reciprocating engine piston fatigue testing device according to claim 2, characterized in that: The inner side surface of the cam 1 (6) is provided with a positioning rod (10), the inner side surface of the cam 2 (8) is provided with a fastening bolt (11), and the cam 1 (6) and the positioning rod (10) are fixedly connected to the positioning rod (10) via the fastening bolt (11).

5. The reciprocating engine piston fatigue testing device according to claim 3, characterized in that: A belt (12) is rotatably mounted on the outer surface of the driving rod (9), a pulley (13) is movably mounted on the inner surface of the belt (12), a curved rod (14) is fixedly mounted on the outer surface of the pulley (13), a protective shell (15) is movably mounted on the outer surface of the pulley (13), and the belt (12) and the pulley (13) form a rotating structure.

6. The reciprocating engine piston fatigue testing device according to claim 1, characterized in that: The detection mechanism includes a pressing rod (16), the pressing rod (16) is fixedly mounted on the outer surface of the curved rod (14), a buffer spring (17) is fixedly mounted on the outer surface of the pressing rod (16), a pressing plate (18) is fixedly mounted on the outer surface of the buffer spring (17), the pressing plate (18) is fixedly mounted on the top end of the signal receiver (19), and the pressing rod (16) and the buffer spring (17) form a telescopic structure.

7. The reciprocating engine piston fatigue testing device according to claim 1, characterized in that: A hydraulic pump (22) is fixedly mounted on the inner end of the bracket (20), a telescopic rod (23) is movably mounted on the outer surface of the hydraulic pump (22), a positioning plate (24) is fixedly mounted on the outer surface of the telescopic rod (23), and the telescopic rod (23) and the positioning plate (24) form a telescopic structure.

8. The reciprocating engine piston fatigue testing device according to claim 7, characterized in that: A pressing spring (25) is fixedly mounted on the inner side of the telescopic rod (23), a connecting rod (26) is fixedly mounted on the outer surface of the pressing spring (25), and a positioning plate (24) is movably mounted on the outer surface of the connecting rod (26).

9. The reciprocating engine piston fatigue testing device according to claim 1, characterized in that: The mounting mechanism includes a clamping plate (27), the clamping plate (27) is fixedly mounted on the outer surface of the positioning plate (24), the outer surface of the clamping plate (27) is movably abutted against the sleeve cylinder (21), and the clamping plate (27) is movably mounted on the inner side surface of the bracket (20), and the inner side surface of the bracket (20) is fixedly mounted with a detector (29).

10. The reciprocating engine piston fatigue testing device according to claim 9, characterized in that: The clamping plate (27) is fixedly mounted with a limiting rod (28) close to the outer surface of the positioning plate (24), and the limiting rod (28) is movably mounted on the inner side of the positioning plate (24).

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