A pressurized piston rod fatigue performance testing device

Abstract

The present invention discloses a pressurized piston rod fatigue performance detection device, which relates to the technical field of piston rod fatigue detection, comprising: a mounting frame and a mounting shaft rotatably connected in the mounting frame, the outer surface of the mounting shaft is fixedly sleeved with a mounting block, and a loading and unloading fixing mechanism, the loading and unloading fixing mechanism is arranged on the mounting block, the pressurized piston rod fatigue performance detection device drives the mounting shaft to rotate through a driving mechanism, so that it rotates to a pressurized detection position, thereby realizing fatigue monitoring of the lateral pressure and axial pressure of the piston rod, and then cooperates with the pressurized detection mechanism to perform fatigue detection on the piston rod. After the detection is completed, the loading and unloading fixing mechanism is driven to rotate to a belt conveyor mechanism for unloading to convey it out, thereby realizing fatigue monitoring of the lateral pressure and axial pressure of the piston rod, and at the same time, the piston rod is automatically loaded and unloaded during the detection process, which greatly improves the detection effect and efficiency of the fatigue resistance of the piston rod.

Description

Technical Field

[0001] The invention relates to the technical field of piston rod fatigue detection, and in particular to a pressurized piston rod fatigue performance detection device. Background Art

[0002] The hydraulic cylinder is a hydraulic actuator that converts hydraulic energy into mechanical energy and performs linear reciprocating motion. It has the advantages of simple structure and reliable operation. It is widely used in the hydraulic systems of large equipment such as engineering machinery and marine equipment. During the working process, the piston rod needs to perform frequent reciprocating telescopic motion, and its surface is in contact with the surrounding working environment medium for a long time. At the same time, due to the harsh working environment of large equipment, which generally contains corrosive media such as acidity, alkalinity, high salt, and high humidity, it is easy to cause pitting and rust on the surface of the piston rod, which in turn causes hydraulic cylinder oil leakage, jamming and other faults, affecting the working reliability and safety of large equipment. Therefore, in engineering applications, according to the actual working conditions, surface technology is often used to prepare a corrosion-resistant functional coating on the surface of the piston rod to improve its environmental adaptability. Common coating types include electroplated chrome layer, thermal spray WC and ceramic coating, laser cladding corrosion-resistant metal coating, etc. At the same time, in order to improve the performance of the piston rod surface against abrasive wear, sand erosion, and hard object collision, its surface coating is required to have a certain wear resistance and hardness. Generally, the hardness of electroplated chromium layer is ≥700HV, the hardness of thermal sprayed WC coating is ≥1200HV, the hardness of thermal sprayed ceramic coating is ≥1100HV, and the hardness of laser cladding corrosion-resistant metal coating is ≥800HV.

[0003] However, in actual use, in addition to contact with the surrounding working medium, the hydraulic cylinder also needs to withstand working loads. Under normal working conditions, the hydraulic cylinder mainly bears axial compression or tensile loads, but in some harsh environments, it also needs to withstand frequent reciprocating lateral loads. For example, the suspension cylinder for construction machinery needs to withstand the lateral load caused by the shaking of the vehicle body when the road is bumpy, and the marine hydraulic cylinder and water conservancy hydraulic cylinder need to withstand the frequent lateral impact of sea water and sea breeze on their surface. The cyclic reciprocating action of the lateral load causes the piston rod to undergo cyclic reciprocating lateral bending during the operation of the hydraulic cylinder, and generates cyclic bending stress inside the coating. Since the piston rod coating has a high hardness and its toughness is generally relatively low, as the cyclic bending stress continues to accumulate, the coating will fail due to bending fatigue and fatigue cracks will appear. After the coating cracks, it is easier for external corrosive media to penetrate into the substrate through the cracks, and then react with the substrate to produce corrosion and produce rust. More seriously, it can cause fatigue fracture of the substrate, leading to accidents.

[0004] The application number is 202011328543.8, which discloses a hydraulic cylinder piston rod coating bending fatigue performance test device and method, specifically disclosing: supporting the two ends of the piston rod by a V-shaped support seat, applying force to the piston rod by a load application system, and detecting the piston rod by a stress detection system and a crack monitoring system, so as to realize the detection and test of the fatigue performance of the piston rod; however, the above-mentioned invention patent still has the following defects in actual use: 1. When performing fatigue performance testing on the piston rod, it is necessary to manually carry and fix the piston rod, which affects the efficiency of fatigue performance testing and wastes a lot of manpower; 2. During the detection of multiple piston rods, only the side pressure of the piston rod can be tested, and the axial force applied to the piston rod during use cannot be used to test the fatigue of the piston rod, which causes damage to the surface coating, resulting in poor detection effect. Summary of the invention

[0005] The purpose of the present invention is to provide a pressurized piston rod fatigue performance detection device to solve the deficiencies in the above-mentioned background technology.

[0006] The purpose of the present invention can be achieved through the following technical solutions:

[0007] A pressurized piston rod fatigue performance detection device, characterized by comprising:

[0008] A mounting frame and a mounting shaft rotatably connected in the mounting frame, wherein a mounting block is fixedly sleeved on the outer surface of the mounting shaft, and a driving mechanism connected to the mounting frame is drivingly connected on the outer surface of the mounting shaft, and the driving mechanism is used to drive the mounting shaft to rotate;

[0009] A loading and unloading fixing mechanism, wherein the loading and unloading fixing mechanism is arranged on the mounting block, and the loading and unloading fixing mechanism is used to automatically load and fix the piston rod, and two belt conveying mechanisms are arranged on the mounting frame, and the belt conveying mechanisms are used to convey the piston rod;

[0010] A pressure detection mechanism is arranged in the mounting frame, and is used to pressurize the piston rod.

[0011] As a further solution of the present invention: the loading and unloading fixing mechanism comprises a supporting shaft rotatably connected to the mounting block, one end of the supporting shaft is fixedly connected to a first connecting plate, one side of the first connecting plate is fixedly connected to a first electric telescopic rod, one end of the first electric telescopic rod is fixedly connected to a second connecting plate, one side of the second connecting plate is fixedly connected to a first telescopic rod, one end of the first telescopic rod is fixedly connected to a clamping frame, a first spring connected to the clamping frame is fixedly sleeved on the outer surface of the first telescopic rod, a clamping mechanism is arranged in the clamping frame, and the clamping mechanism is used to clamp and fix piston rods of different sizes;

[0012] The outer surface of the support shaft is transmission-connected with a transmission mechanism connected to the mounting block, and the transmission mechanism is used to drive the support shaft to rotate.

[0013] As a further solution of the present invention: the clamping mechanism includes a first transmission motor fixedly connected to the clamping frame, the output end of the first transmission motor is fixedly connected to a bidirectional threaded rod rotatably connected to the clamping frame through a coupling, the outer surface of the bidirectional threaded rod is threadedly connected to two transmission blocks, one side of the transmission block is fixedly connected to a second telescopic rod, one end of the second telescopic rod is fixedly connected to a support frame, the outer surface of the second telescopic rod is fixedly sleeved with a second spring fixedly connected to the support frame, the top of the support frame is fixedly connected to a support plate, one side of the support plate is fixedly connected to a third telescopic rod, one end of the third telescopic rod is fixedly connected to a third connecting plate, the outer surface of the third telescopic rod is fixedly sleeved with a third spring fixedly connected to the third connecting plate, one side of the third connecting plate is fixedly connected to the clamping block by bolts, and a fixing groove is provided in the clamping block.

[0014] As a further solution of the present invention: the transmission mechanism includes a second transmission motor fixedly connected to the mounting block, the output end of the second transmission motor is fixedly connected to the transmission shaft through a coupling, the outer surface of the transmission shaft is fixedly sleeved with a first transmission gear, and the outer surface of the first transmission gear is meshingly connected with a second transmission gear fixedly sleeved with the support shaft.

[0015] As a further solution of the present invention: the belt conveying mechanism includes a belt conveyor, a plurality of mounting bars are fixedly connected to the belt of the belt conveyor, and a V-shaped placement block is fixedly connected to the top of the mounting bar.

[0016] As a further solution of the present invention: the pressure detection mechanism includes a first electric hydraulic rod fixedly connected to the mounting frame, the bottom end of the first electric hydraulic rod is fixedly connected to a pressure frame, a pressure block is fixedly connected to the pressure frame, a supporting mechanism is arranged in the mounting frame, the supporting mechanism is used to support the loading and unloading fixing mechanism, and a longitudinal pressure mechanism is arranged on one side of the mounting frame.

[0017] As a further solution of the present invention: the support mechanism includes a plurality of support blocks slidably connected to the mounting frame, and one side of the support block is fixedly connected to a second electric telescopic rod fixedly connected to the mounting frame via a connecting block.

[0018] As a further solution of the present invention: the longitudinal pressurizing mechanism includes two fourth connecting plates fixedly connected to the mounting frame, one side of the fourth connecting plate is fixedly connected to the second electric hydraulic rod, and one end of the second electric hydraulic rod is fixedly connected to the transmission frame.

[0019] As a further solution of the present invention: the driving mechanism includes a driving motor fixedly connected to the mounting frame, the output end of the driving motor is fixedly connected to the driving shaft through a coupling, the outer surface of the driving shaft is fixedly sleeved with a first driving gear, and the outer surface of the first driving gear is meshingly connected with a second driving gear fixedly sleeved with the mounting shaft.

[0020] As a further solution of the present invention: a rubber buffer pad is fixedly connected inside the V-shaped placement block.

[0021] Beneficial effects of the present invention:

[0022] (1) The piston rod is conveyed to the position of the loading and unloading fixing mechanism through the belt conveyor mechanism, and the piston rod is automatically clamped and loaded through the loading and unloading fixing mechanism. Then, the installation shaft is driven by the driving mechanism to rotate and rotate to the pressure detection position to realize the fatigue monitoring of the lateral pressure and axial pressure of the piston rod. Then, the fatigue detection of the piston rod is carried out in cooperation with the pressure detection mechanism. After the detection is completed, the loading and unloading fixing mechanism is driven to rotate to the belt conveyor mechanism for unloading and transported out, thereby realizing the fatigue monitoring of the lateral pressure and axial pressure of the piston rod. At the same time, the piston rod is automatically loaded and unloaded during the detection process, which greatly improves the detection effect and efficiency of the fatigue resistance of the piston rod.

[0023] (2) According to the diameter and width of the piston rod, the clamping block on the third connecting plate is replaced, and then the piston rod is transported to the loading position. Then, the transmission mechanism drives the support shaft and the clamping frame to rotate 90°, and the first electric telescopic rod drives the clamping frame to move so that the piston rod enters the clamping frame. Then, the clamping mechanism in the clamping frame drives the two clamping blocks to approach each other to clamp and fix the piston rod, and then drives the support shaft to rotate 90° in the opposite direction. When the detection is completed, the clamping frame is driven to rotate to the bottom, and then the clamped piston rod is automatically discharged, thereby realizing the clamping and loading and unloading of piston rods of different sizes, further improving the detection efficiency of the piston rod.

[0024] (3) The clamped piston rod is pressurized laterally and axially by a pressure detection mechanism to achieve lateral and axial fatigue detection of the piston rod. At the same time, during the detection process, the clamping frame is supported by the support mechanism, and the support frame cooperates with the extension and retraction of the first telescopic rod and the first spring to transfer the lateral pressure to the support mechanism, thereby reducing the loss of the detection device caused by the large lateral pressure. At the same time, when the axial pressure detection is performed, the transmission frame is driven to move by the second electric hydraulic rod, and the transmission frame supports and squeezes the third connecting plate, thereby reducing the damage to the detection device during the axial pressure detection. Thereby, when the piston rod is detected, the damage to the detection device caused by the monitoring pressure is avoided, thereby improving the stability of the detection device. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The present invention will be further described below in conjunction with the accompanying drawings.

[0026] Figure 1 is a first stereogram of the external structure of the present invention;

[0027] Figure 2 is a second stereoscopic diagram of the external structure of the present invention;

[0028] Figure 3 It is a three-dimensional diagram of the internal structure of the present invention;

[0029] Figure 4 is a first stereoscopic diagram of the external structure of the clamping structure of the present invention;

[0030] Figure 5 is a second stereoscopic diagram of the external structure of the clamping structure of the present invention;

[0031] Figure 6 The present invention Figure 3 A magnified view of middle;

[0032] Figure 7 The present invention Figure 3 Enlarged view of B.

[0033] In the figure: 1, mounting frame; 2, mounting shaft; 3, mounting block; 11, supporting shaft; 12, first connecting plate; 13, first electric telescopic rod; 14, second connecting plate; 15, first telescopic rod; 16, clamping frame; 17, first spring; 21, first transmission motor; 22, bidirectional threaded rod; 23, transmission block; 24, second telescopic rod; 25, supporting frame; 26, second spring; 27, supporting plate; 28, third telescopic rod; 29, third connecting plate; 290, third spring; 291, clamping block; 2 92. fixing groove; 31. second transmission motor; 32. transmission shaft; 33. first transmission gear; 34. second transmission gear; 41. belt conveyor; 42. mounting bar; 43. V-shaped placement block; 51. first electric hydraulic rod; 52. pressure frame; 53. pressure block; 54. support block; 55. second electric telescopic rod; 56. fourth connecting plate; 57. second electric hydraulic rod; 58. transmission frame; 61. drive motor; 62. drive shaft; 63. first drive gear; 64. second drive gear. DETAILED DESCRIPTION

[0034] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. 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 creative work are within the scope of protection of the present invention.

[0035] See also Figure 1-Figure 7 As shown, the present invention is a pressurized piston rod fatigue performance detection device, including a mounting frame 1, a mounting shaft 2 is rotatably connected inside the mounting frame 1, a mounting block 3 is fixedly sleeved on the outer surface of the mounting shaft, a driving mechanism connected to the mounting frame 1 is transmission-connected on the outer surface of the mounting shaft 2, the driving mechanism is used to drive the mounting shaft 2 to rotate, the driving mechanism includes a driving motor 61 fixedly connected to the mounting frame 1, the driving motor 61 is controlled by a PLC programming program, and the driving motor 61 can be controlled to rotate forward and reverse and rotate at an angle, the output end of the driving motor 61 is fixedly connected to a driving shaft 62 through a coupling, and the outer surface of the driving shaft 62 is fixedly sleeved The first driving gear 63, the outer surface of which is meshedly connected with the second driving gear 64 that is fixed to the mounting shaft 2, drives the driving shaft 62 to rotate through the driving motor 61, and the driving shaft 62 drives the mounting shaft 2 to rotate through the first driving gear 63 and the second driving gear 64. The outer surface of the mounting block 3 is provided with a plurality of loading and unloading fixing mechanisms, which are used for automatically loading and fixing the piston rod. Two belt conveyor mechanisms are provided on the mounting frame 1, which are used for conveying the piston rod. A pressure detection mechanism is provided in the mounting frame 1, which is used for pressurizing the piston rod.

[0036] The piston rod is automatically transported to one of the loading and unloading fixing mechanism positions on the mounting block 3 by a belt conveyor mechanism, and then the piston rod is clamped and loaded by the loading and unloading fixing mechanism. After loading, the mounting shaft 2 is driven to rotate by the driving mechanism, and the mounting shaft 2 drives the mounting block 3 to rotate, so that the clamped and loaded piston rod is rotated to the bottom of the pressure detection position, and then the outer surface of the piston rod is pressurized, and at the same time, the stress detection system and crack monitoring system connected to the mounting frame 1 are used to detect the piston rod. The stress detection system and crack monitoring system are used to detect the piston rod. These are all existing technologies, so we will not elaborate on them here. The fatigue performance of the piston rod is detected and tested, and the lateral and axial pressure fatigue resistance of the piston rod is tested. When the test is completed, the mounting shaft 2 is driven to rotate to the unloading position, and then the loading and unloading fixing mechanism automatically unloads the tested piston sleeve onto the belt conveyor mechanism for transportation, thereby realizing fatigue monitoring of the lateral pressure and axial pressure of the piston rod. At the same time, the piston rod is automatically loaded and unloaded during the test process, which greatly improves the detection effect and efficiency of the fatigue resistance of the piston rod.

[0037] Embodiment 2

[0038] Based on Example 1, please refer to Figure 3-Figure 7 As shown, the loading and unloading fixing mechanism includes a support shaft 11 rotatably connected to the mounting block 3, one end of the support shaft 11 is fixedly connected to a first connecting plate 12, one side of the first connecting plate 12 is fixedly connected to a first electric telescopic rod 13, one end of the first electric telescopic rod 13 is fixedly connected to a second connecting plate 14, one side of the second connecting plate 14 is fixedly connected to a first telescopic rod 15, one end of the first telescopic rod 15 is fixedly connected to a clamping frame 16, the outer surface of the first telescopic rod 15 is fixedly sleeved with a first spring 17 connected to the clamping frame 16, and a clamping mechanism is arranged in the clamping frame 16, and the clamping mechanism is used to clamp and fix piston rods of different sizes;

[0039] The outer surface of the support shaft 11 is transmission-connected with a transmission mechanism connected to the mounting block 3 , and the transmission mechanism is used to drive the support shaft 11 to rotate.

[0040] The clamping mechanism includes a first transmission motor 21 fixedly connected to the clamping frame 16. The first transmission motor 21 is controlled by a PLC programming program to control the first transmission motor 21 to rotate forward and backward and rotate at an angle. The output end of the first transmission motor 21 is fixedly connected to a bidirectional threaded rod 22 rotatably connected to the clamping frame 16 through a coupling. The outer surface of the bidirectional threaded rod 22 is threadedly connected to two transmission blocks 23. A second telescopic rod 24 is fixedly connected to one side of the transmission block 23. One end of the second telescopic rod 24 is fixedly connected to a support frame 25. The outer surface of the second telescopic rod 24 is fixedly sleeved with a second spring 26 fixedly connected to the support frame 25, the top of the support frame 25 is fixedly connected with a support plate 27, one side of the support plate 27 is fixedly connected with a third telescopic rod 28, one end of the third telescopic rod 28 is fixedly connected with a third connecting plate 29, the outer surface of the third telescopic rod 28 is fixedly sleeved with a third spring 290 fixedly connected to the third connecting plate 29, one side of the third connecting plate 29 is fixedly connected with a clamping block 291 by bolts, and a fixing groove 292 is opened in the clamping block 291.

[0041] The transmission mechanism includes a second transmission motor 31 fixedly connected to the mounting block 3. The second transmission motor 31 is controlled by a PLC programming program, and can be controlled to rotate forward and reverse and rotate at an angle. The output end of the second transmission motor 31 is fixedly connected to a transmission shaft 32 through a coupling. The outer surface of the transmission shaft 32 is fixedly sleeved with a first transmission gear 33, and the outer surface of the first transmission gear 33 is meshingly connected with a second transmission gear 34 fixedly sleeved with the support shaft 11.

[0042] The transmission shaft 32 is driven to rotate by the second transmission motor 31 , and the transmission shaft 32 drives the support shaft 11 to rotate through the first transmission gear 33 and the second transmission gear 34 .

[0043] The belt conveying mechanism comprises a belt conveyor 41 , on which a plurality of mounting bars 42 are fixedly connected, and on the top of the mounting bars 42 a V-shaped placement block 43 is fixedly connected, and inside the V-shaped placement block 43 a rubber buffer pad is fixedly connected.

[0044] The mounting bar 42 is driven to move by the belt conveyor 41, so that the piston rod placed on the V-shaped placement block 43 on the mounting bar 42 moves to the loading position on one side of the mounting frame 1, and then the support shaft 11 is driven to rotate by the transmission mechanism to rotate the clamping frame 16 to a horizontal position, and then the second connecting plate 14, the first telescopic rod 15 and the clamping frame 16 are driven to move by the first electric telescopic rod 13, so that the piston rod enters the clamping frame 16, and at this time, the first transmission motor 21 is operated, and the first transmission motor 21 drives the bidirectional threaded rod 22 to rotate, and the bidirectional threaded rod 22 drives the two transmission blocks 23 to approach each other, and the transmission block 23 drives the support frame 25 to move through the second telescopic rod 24, and then the support frame 25 moves through the third telescopic rod 28 and the third connecting plate 29, and the third connecting plate 29 drives the clamping block 291 to move, and the clamping block 291 passes through the fixed groove 29 2 clamps and fixes the two sides of the piston rod, and different clamping blocks 291 can be replaced according to the diameter of the piston rod, so as to realize automatic loading of piston rods of different sizes. After loading, the installation shaft 2 is driven to rotate by the driving mechanism, so that the clamped piston rod is rotated to the top, and then the lateral pressure detection is performed by the pressure detection mechanism. After the detection is completed, the piston rod is driven to rotate 90°, and then the piston rod is axially pressurized by the inspection and detection mechanism. After the detection is completed, the piston rod is driven to rotate to the bottom, and then the second connecting plate 14, the first telescopic rod 15 and the clamping frame 16 are driven downward by the first electric telescopic rod 13 to place the piston rod on the V-shaped placement block 43. Then the first transmission motor 21 drives the bidirectional threaded rod 22 to rotate, drives the two transmission blocks 23 away from each other, and puts down the piston sleeve rod, so as to realize automatic unloading of the piston sleeve rod after detection.

[0045] Embodiment 3

[0046] Based on Example 2, please refer to Figure 3-Figure 7 As shown, the pressure detection mechanism includes a first electric hydraulic rod 51 fixedly connected to the mounting frame 1, the bottom end of the first electric hydraulic rod 51 is fixedly connected to a pressure frame 52, and the pressure frame 52 is fixedly connected to a pressure block 53. A supporting mechanism is arranged in the mounting frame 1, and the supporting mechanism is used to support the loading and unloading fixing mechanism. A longitudinal pressure mechanism is arranged on one side of the mounting frame 1.

[0047] The supporting mechanism includes a plurality of supporting blocks 54 slidably connected to the mounting frame 1 , and a second electric telescopic rod 55 fixedly connected to the mounting frame 1 is fixedly connected to one side of the supporting block 54 via a connecting block.

[0048] After the piston sleeve is loaded to the bottom of the pressure block 53, the second electric telescopic rod 55 drives the support block 54 to move, and the support block 54 enters the bottom of the clamping frame 16, and then the first electric hydraulic rod 51 drives the pressure frame 52 to move downward, and the pressure frame 52 drives the pressure block 53 to move downward, and the pressure block 53 pressurizes the piston sleeve. At the same time, the stress detection system and the crack monitoring system are used to detect the piston rod. The stress detection system and the crack monitoring system are used to detect the piston rod. Both are existing technologies, so they will not be described in detail here, thereby realizing lateral fatigue detection of the piston rod. At the same time, during the pressurization detection process, when pressure is applied to the piston sleeve, the piston sleeve presses the clamping block 291 and the support frame 25. When pressure is applied downward, the support frame 25 drives the second telescopic rod 24 and the second spring 26 to contract, so that the support frame 25 abuts against the clamping frame 16, and the pressure is transmitted to the clamping frame 16. At the same time, the clamping frame 16 drives the first telescopic rod 15 and the first spring 17 to contract, and the clamping frame 16 moves downward, so that the clamping frame 16 abuts against the support block 54, thereby transmitting the pressure to the support block 54 on the mounting frame 1, preventing the support frame 25 from being subjected to excessive pressure, which may cause the bidirectional threaded rod 22 to bend, or transmitting the pressure to the mounting shaft 2, causing the mounting shaft 2 to be subjected to excessive pressure, causing the mounting shaft 2 to bend and be damaged, thereby reducing the damage to the detection device caused by the pressure during the pressurized detection process, and improving the stability of the detection device.

[0049] The longitudinal pressing mechanism includes two fourth connecting plates 56 fixedly connected to the mounting frame 1 , one side of the fourth connecting plate 56 is fixedly connected to a second electric hydraulic rod 57 , and one end of the second electric hydraulic rod 57 is fixedly connected to a transmission frame 58 .

[0050] When the lateral detection is completed, the mounting shaft 2 is then driven to rotate 90°, and then the transmission frame 58 is driven to move upward by the second electric hydraulic rod 57 below, and the transmission frame 58 supports the third connecting plate 29 on the clamping frame 16, and then the transmission frame 58 is driven downward by the second electric hydraulic rod 57 above, and the transmission frame 58 is against the third connecting plate 29, and then the third connecting plate 29 moves downward, the third telescopic rod 28 and the third spring 290 are opened and extended, and at the same time, the third connecting plate 29 drives the clamping block 291 to move downward, and the clamping block 291 applies longitudinal pressure to the piston rod. At the same time, the stress detection system and the crack monitoring system are used to detect the piston rod. The stress detection system and the crack monitoring system are used to detect the piston rod. Both are existing technologies, so they will not be described in detail here. A longitudinal fatigue test is performed. At the same time, during the detection process, the third connecting plate 29 is moved and the second electric hydraulic rod 57 drives the transmission frame 58 to support and squeeze, so that the pressure applied during the detection process does not apply pressure to the clamping frame 16 and the support frame 25, thereby reducing the damage to the detection device caused by the pressure and improving the stability of the detection device.

[0051] The working principle of the present invention is as follows: the piston rod is automatically transported to one of the loading and unloading fixing mechanism positions on the mounting block 3 by a belt conveyor mechanism, and then the piston rod is clamped and loaded by the loading and unloading fixing mechanism. After loading, the mounting shaft 2 is driven to rotate by a driving mechanism, and the mounting shaft 2 drives the mounting block 3 to rotate, so that the piston rod for clamping and loading is rotated to the bottom of the pressure detection position, and then the outer surface of the piston rod is pressurized, and at the same time, the stress detection system and crack monitoring system connected to the mounting frame 1 are used to detect the piston rod, and the stress detection system and crack monitoring system are used to detect the piston rod. The detection is all existing technology, so I will not go into details here. The fatigue performance of the piston rod is detected and tested, and the lateral and axial pressure fatigue resistance of the piston rod is tested. When the detection is completed, the mounting shaft 2 is driven to rotate to the unloading position, and then the loading and unloading fixing mechanism automatically unloads the tested piston sleeve onto the belt conveyor mechanism for transportation, thereby realizing fatigue monitoring of the lateral pressure and axial pressure of the piston rod. At the same time, the piston rod is automatically loaded and unloaded during the detection process, which greatly improves the detection effect and efficiency of the fatigue resistance of the piston rod.

[0052] The above is a detailed description of an embodiment of the present invention, but the content is only a preferred embodiment of the present invention and cannot be considered to limit the scope of implementation of the present invention. All equivalent changes and improvements made within the scope of the present invention should still fall within the scope of the patent coverage of the present invention.

Claims

1. A pressurized piston rod fatigue performance detection device, characterized in that: include: A mounting frame (1) and a mounting shaft (2) rotatably connected inside the mounting frame (1), a mounting block (3) being fixedly sleeved on the outer surface of the mounting shaft (2), a driving mechanism connected to the mounting frame (1) being drivingly connected on the outer surface of the mounting shaft (2), and the driving mechanism being used to drive the mounting shaft (2) to rotate; A loading and unloading fixing mechanism, the loading and unloading fixing mechanism is arranged on the mounting block (3), the loading and unloading fixing mechanism is used to automatically load and fix the piston rod, and the mounting frame (1) is provided with two belt conveying mechanisms, the belt conveying mechanisms are used to convey the piston rod; A pressure detection mechanism is provided in the mounting frame (1), and is used to pressurize the piston rod.

2. A pressurized piston rod fatigue performance detection device according to claim 1, characterized in that: The loading and unloading fixing mechanism comprises a support shaft (11) rotatably connected to the mounting block (3), one end of the support shaft (11) is fixedly connected to a first connecting plate (12), one side of the first connecting plate (12) is fixedly connected to a first electric telescopic rod (13), one end of the first electric telescopic rod (13) is fixedly connected to a second connecting plate (14), one side of the second connecting plate (14) is fixedly connected to a first telescopic rod (15), one end of the first telescopic rod (15) is fixedly connected to a clamping frame (16), the outer surface of the first telescopic rod (15) is fixedly sleeved with a first spring (17) connected to the clamping frame (16), and a clamping mechanism is arranged in the clamping frame (16), and the clamping mechanism is used to clamp and fix piston rods of different sizes; The outer surface of the support shaft (11) is transmission-connected to a transmission mechanism connected to the mounting block (3), and the transmission mechanism is used to drive the support shaft (11) to rotate.

3. A pressurized piston rod fatigue performance detection device according to claim 2, characterized in that: The clamping mechanism comprises a first transmission motor (21) fixedly connected to the clamping frame (16); an output end of the first transmission motor (21) is fixedly connected to a bidirectional threaded rod (22) rotatably connected to the clamping frame (16) via a coupling; an outer surface of the bidirectional threaded rod (22) is threadedly connected to two transmission blocks (23); one side of the transmission block (23) is fixedly connected to a second telescopic rod (24); one end of the second telescopic rod (24) is fixedly connected to a support frame (25); and an outer surface of the second telescopic rod (24) is fixedly sleeved with a support frame (25). A second spring (26) is fixedly connected, the top of the support frame (25) is fixedly connected to a support plate (27), one side of the support plate (27) is fixedly connected to a third telescopic rod (28), one end of the third telescopic rod (28) is fixedly connected to a third connecting plate (29), the outer surface of the third telescopic rod (28) is fixedly sleeved with a third spring (290) fixedly connected to the third connecting plate (29), one side of the third connecting plate (29) is fixedly connected to a clamping block (291) by bolts, and a fixing groove (292) is provided in the clamping block (291).

4. A pressurized piston rod fatigue performance detection device according to claim 2, characterized in that: The transmission mechanism comprises a second transmission motor (31) fixedly connected to the mounting block (3); an output end of the second transmission motor (31) is fixedly connected to a transmission shaft (32) via a coupling; a first transmission gear (33) is fixedly sleeved on an outer surface of the transmission shaft (32); and a second transmission gear (34) fixedly sleeved on an outer surface of the first transmission gear (33) is meshingly connected to a second transmission gear (34) fixedly sleeved on a support shaft (11).

5. The pressurized piston rod fatigue performance detection device according to claim 1 is characterized in that: The belt conveying mechanism comprises a belt conveyor (41), a plurality of mounting strips (42) are fixedly connected to the belt of the belt conveyor (41), and a V-shaped placement block (43) is fixedly connected to the top of the mounting strip (42).

6. A pressurized piston rod fatigue performance detection device according to claim 1, characterized in that: The pressurizing detection mechanism comprises a first electric hydraulic rod (51) fixedly connected to the mounting frame (1); the bottom end of the first electric hydraulic rod (51) is fixedly connected to a pressurizing frame (52); a pressurizing block (53) is fixedly connected to the pressurizing frame (52); a supporting mechanism is arranged in the mounting frame (1), the supporting mechanism is used to support the loading and unloading fixing mechanism; and a longitudinal pressurizing mechanism is arranged on one side of the mounting frame (1).

7. A pressurized piston rod fatigue performance detection device according to claim 6, characterized in that: The support mechanism comprises a plurality of support blocks (54) slidably connected to the mounting frame (1); one side of the support block (54) is fixedly connected to a second electric telescopic rod (55) fixedly connected to the mounting frame (1) via a connecting block.

8. A pressurized piston rod fatigue performance detection device according to claim 6, characterized in that: The longitudinal pressurizing mechanism comprises two fourth connecting plates (56) fixedly connected to the mounting frame (1), one side of the fourth connecting plate (56) being fixedly connected to a second electric hydraulic rod (57), and one end of the second electric hydraulic rod (57) being fixedly connected to a transmission frame (58).

9. The pressurized piston rod fatigue performance detection device according to claim 1 is characterized in that: The driving mechanism comprises a driving motor (61) fixedly connected to the mounting frame (1); the output end of the driving motor (61) is fixedly connected to a driving shaft (62) via a coupling; the outer surface of the driving shaft (62) is fixedly sleeved with a first driving gear (63); the outer surface of the first driving gear (63) is meshingly connected with a second driving gear (64) fixedly sleeved with the mounting shaft (2).

10. A pressurized piston rod fatigue performance detection device according to claim 5, characterized in that: A rubber buffer pad is fixedly connected inside the V-shaped placement block (43).

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