Hydraulic joint and hose pulse test bench

Abstract

The invention discloses a hydraulic joint and hose pulse test bench, and relates to the technical field of pipe fitting testing. The device comprises a test platform and a control system, wherein the control system is in signal connection with the test platform; the test platform comprises an oil tank, a hydraulic oil well pump, a pulse generating device, an energy accumulator and a pressure measuring connector, wherein the oil tank, the hydraulic oil well pump, the pulse generating device, the energy accumulator and the pressure measuring connector are connected through pipelines; the control system comprises a LabVIEW control program and a test system; the LabVIEW control program comprises a communication module and a library function; the test system comprises a sensing module, a data processing module and a PLC control module. The test frequency of the LabVIEW control program can be adjusted from 0.5 Hz to 100 Hz, the adjustment range can be simulated and adjusted at will, meanwhile, signals of the sensing module and sent control signals can be synchronously collected, follow-up signal processing is carried out, and therefore the convenience and operability of hose testing are improved, collected displacement signals, force signals and pressure signals are truly reflected, and the test efficiency is improved. And outputting parameters for the hydraulic system under the current given signal.

Description

Technical Field

[0001] The present invention relates to the technical field of pipe fitting testing, specifically a hydraulic joint and hose pulse test bench. Background Art

[0002] Hydraulic hoses, also known as hydraulic tubing, hydraulic hoses, high-pressure hoses, hydraulic pipes, steel wire high-pressure pipes, steel wire braided hoses, and steel wire wound hoses, are generally divided into steel wire braided hydraulic hoses and steel wire wound hydraulic hoses. A hydraulic hose mainly consists of a liquid-resistant inner rubber layer, a middle rubber layer, 2 or 4 or 6 layers of steel wire winding reinforcement layers, and an outer rubber layer. The inner rubber layer has the function of enabling the conveyed medium to bear pressure and protecting the steel wire from erosion. The outer rubber layer protects the steel wire from damage, and the steel wire layer is the skeleton material that plays a reinforcing role; Hydraulic pulse testing refers to the process of simulating the pressure fluctuation situation in the actual working environment and repeatedly pressurizing and depressurizing the hydraulic hose to detect its ability to withstand pulsating pressure. Through this test, the performance of the hose under extreme conditions can be evaluated, including its fatigue resistance, sealing performance, and the stability of the overall structure; However, there are still some defects in the existing hose hydraulic pulse test benches during the testing of hoses: 1. When the existing hose hydraulic pulse test bench tests a hose, most of the control systems carried by it are inconvenient to arbitrarily adjust the test frequency and cannot process the signals of sensors, resulting in inconvenient operation of hose testing; 2. At the same time, most of the control systems of the hose hydraulic pulse test bench are inconvenient to synchronously record the numbers and graphics during the test and the numbers and graphics after the test is completed, so no effective basis can be formed; 3. Most of the existing hose hydraulic pulse test benches cannot control the bending degree of the hose according to the inner diameter size of the hose to be tested. Since the test requirements for hoses with different inner diameter sizes are different, the flexibility of the hose hydraulic pulse test bench is poor; In view of the above problems, the inventor proposes a hydraulic joint and hose pulse test bench to solve the above problems. Summary of the Invention

[0003] In order to solve the above problems, the purpose of the present invention is to provide a hydraulic joint and hose pulse test bench.

[0004] To solve the above technical problems, the present invention adopts the following technical solutions: a hose pulse test bench, including a test platform and a control system, and the control system is signal-connected to the test platform; The test platform includes an oil tank, a hydraulic oil pump, a pulse generating device, an accumulator, and a pressure measuring joint, and the oil tank, the hydraulic oil pump, the pulse generating device, the accumulator, and the pressure measuring joint are connected by pipelines; The control system includes a LabVIEW control program and a test system; The LabVIEW control program includes a communication module and library functions; The test system includes a sensing module, a data processing module, and a PLC control module.

[0005] Preferably, a one-way valve is provided between the fuel tank and the hydraulic oil pump.

[0006] Preferably, a hydraulic direction valve is provided between the hydraulic oil pump and the pulse generating device.

[0007] Preferably, the communication module includes a data acquisition card and a counter card.

[0008] Preferably, the sensing module includes a displacement sensor, a torque sensor, a pressure sensor, a temperature sensor, and a counter.

[0009] Preferably, the data processing module is used for data display, data processing, data storage, and real-time display of the torque change curve.

[0010] The present invention also provides a hydraulic joint for a hose pulse test bench, including a joint pipe body. The outer wall of one end of the joint pipe body is provided with a number of uniformly distributed conical rings. A concave cavity is formed between the conical rings and the outer wall of the joint pipe body. The outside of the joint pipe body is provided with a number of uniformly distributed semi-circular limiting rings. The inner wall of the semi-circular limiting rings is provided with a wedge-shaped surface. The semi-circular limiting rings and the wedge-shaped surfaces are in movable contact with the concave cavity. Two ear plates are fixedly connected to each of the semi-circular limiting rings. A locking screw is threadedly rotatably installed between two adjacent ear plates. Nuts are threadedly rotatably installed at both ends of each of the locking screws. The outer wall of the other end of the joint pipe body is provided with a thread groove.

[0011] Preferably, a hexagonal seat is provided on the outer wall of the other end of the joint pipe body.

[0012] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. In the present invention, the test frequency of the LabVIEW control program is adjustable from 0.5 to 100 Hz, and the adjustment range can be arbitrarily simulated. The LabVIEW control program can synchronously collect the signals of the sensing module and the control signals sent out, and perform subsequent signal processing, thereby improving the convenience and operability of hose testing, and truly reflecting the collected displacement signals, force signals, and pressure signals, which are the output parameters of the hydraulic system under the current given signal; 2. In the present invention, the LabVIEW control program includes real-time digital and graphical displays during the test. Meanwhile, the LabVIEW control program can save the test data and test curves after the test to a specified path, where the test data is saved in the form of an Excel table and the test curves are saved in the jpeg format, thus providing a basis for subsequent data processing and test results during the hose test; 3. In the present invention, the test platform can control the bending degree during the hose test according to the inner diameter size of the hose to meet the tests of hoses with different inner diameter sizes, thereby improving the flexibility of the test platform; 4. In the present invention, by configuring a one-way valve and a hydraulic direction valve on the test platform, the one-way valve is used to prevent the pressure wave from being transmitted back to the oil source of the fuel tank, and the hydraulic direction valve controls the pulse frequency, pressure peak value, and rising gradient, thereby improving the accuracy of the hose test. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0014] Figure 1 It is a schematic diagram of the composition structure of the hose pulse test bench of the present invention.

[0015] Figure 2 It is a schematic diagram of the composition of the control system of the present invention.

[0016] Figure 3 It is a schematic diagram of the overall structure of the hydraulic joint of a hose pulse test bench of the present invention.

[0017] Figure 4 It is an exploded structure diagram of the hydraulic joint of a hose pulse test bench of the present invention.

[0018] Figure 5 It is a schematic diagram of the connection structure between the conical ring and the joint pipe body of the present invention.

[0019] Figure 6 It is a schematic diagram of the structure of the semi-circular limit ring of the present invention.

[0020] Figure 7 It is a schematic diagram of the installation of the hose assembly durability (pulse) test in the embodiment of the present invention.

[0021] Figure 8 It is a schematic diagram of the pressure cycle curve of the durability (pulse) test in the embodiment of the present invention.

[0022] In the figure: 100, control system; 200, test platform; 50, fuel tank; 60, hydraulic oil pump; 70, pulse generator; 80, accumulator; 90, pressure measuring joint; 61, check valve; 62, hydraulic direction valve; 10, LabVIEW control program; 40, test system; 20, communication module; 30, library function; 21, data acquisition card; 22, counter card; 41, sensing module; 42, data processing module; 43, PLC control module; 411, displacement sensor; 412, torque sensor; 413, pressure sensor; 414, temperature sensor; 415, counter; 1, joint body; 11, conical ring; 12, concave cavity; 13, semi-circular limit ring; 14, wedge surface; 15, ear plate; 16, locking screw; 17, nut; 18, thread groove; 19, hexagonal seat. Specific embodiments

[0023] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0024] Embodiment: As Figure 1-8 shown, the present invention provides a hose pulse test bench, including a test platform 200 and a control system 100, and the control system 100 is signal-connected to the test platform 200; The test platform 200 includes a fuel tank 50, a hydraulic oil pump 60, a pulse generator 70, an accumulator 80 and a pressure measuring joint 90. The fuel tank 50, the hydraulic oil pump 60, the pulse generator 70, the accumulator 80 and the pressure measuring joint 90 are connected by pipelines. A check valve 61 is arranged between the fuel tank 50 and the hydraulic oil pump 60, and a hydraulic direction valve 62 is arranged between the hydraulic oil pump 60 and the pulse generator 70. By providing the pressure measuring joint 90, the pressure measuring joint 90 is used for the assembly of the hose assembly to be tested. This test is carried out on the hose assembly that has not been used within 30 days after the joint is assembled. The hydraulic oil pump 60 is used to suck the hydraulic oil in the fuel tank 50, the pulse generator 70 is used to generate and output pulse waves, the check valve 61 is used to prevent the pressure wave from being transmitted back to the oil source of the fuel tank 50, and the accumulator 80 is used to supplement the instantaneous flow required during the pulse. In the rising section, the accumulator 80 releases the stored high-pressure liquid to generate the required rising slope and peak value. The hydraulic direction valve 62 controls the pulse frequency, the pressure peak value and the rising gradient; The test steps of the hose assembly are as follows: 1. Assemble both ends of the hose assembly through two pressure measuring connectors 90. Conduct this test on the unused hose assembly within 30 days after assembling the connectors. 2. Calculate the free length of the hose under the test and select the appropriate formula as follows according to the inner diameter of the hose: A: For hoses with an inner diameter of 22 mm (including 22 mm) or less: Bend 180°, free length ; B: For hoses with an inner diameter greater than 22 mm: Bend 90°, free length ; In the formula: is the minimum bending radius, is the outer diameter of the hose; Connect the hose assembly test piece to the pressure measuring connector 90 on the test platform 200 and install it as shown. When the nominal inner diameter of the hose assembly is 22 mm (including 22 mm) or less, it should be bent 180°. When it is greater than 22 mm, it should be bent 90°. Figure 7 ; 3. The test oil meets the requirements of viscosity grade ISO VG 46 ( ), and circulates inside the hose assembly at a sufficient speed to maintain the same temperature. 4. Apply a pulsed pressure inside the hose assembly, with a frequency between 0.5 Hz and 1.3 Hz (between 30 cycles per minute and 78 cycles per minute), and record the test frequency. 5. The pressure cycle diagram should be within the shaded area shown in Figure 8 , and make it as close as possible to the curve in the shown area. The actual rate of pressure rise should be between 100 MPa and 550 MPa / s. 6. Conduct a pulse test on the hose assembly at pressures of 100%, 125%, and 133% of the maximum working pressure of the hose assembly, and keep the test oil temperature at .

[0025] Figure 8 In , a is the tangent of the pressure rise rate, b is to determine the pressure rise rate between these two points, c is 45% - 55% of a complete pulse cycle, and d is a complete pulse cycle. The pressure rise tangent is a straight line drawn through two points on the pressure rise curve. One point is at 15% of the test pressure, and the other is at 85% of the test pressure. Point 0 is the intersection of the pressure rise tangent and the pressure of 0 MPa. The pressure rise rate is the slope of the pressure rise tangent, expressed in MPa / s, and the cycle speed should be consistent, within the range of 0.5 Hz to 1.3 Hz.

[0026] The control system 100 includes a LabVIEW control program 10 and a test system 40. The LabVIEW control program 10 is a graphical programming language. The LabVIEW control program 10 integrates all the functions of communicating with hardware and a data acquisition card 21 that meet the GPIB, VXI, RS-232, and RS-485 protocols. At the same time, it has built-in library functions 30 that facilitate the application of software standards such as TCP / IP and ActiveX. The LabVIEW control program 10 includes a communication module 20 and library functions 30. The communication module 20 includes a data acquisition card 21 and a counter card 22. The data acquisition card 21 uses a PCI-1713 data acquisition card, and the counter card 22 uses a PCL-836 counter card. The PCI-1713 data acquisition card: 32 single-ended or 16 differential analog input channels, 12-bit A / D conversion resolution, the sampling rate of the A / D converter can reach 100KS / s, and there is a 4096-sample FIFO buffer on the card. The PCL-836 counter card is a counter / timer and digital I / O card for ISA slots, providing 6 16-bit counter channels, and also having 16 digital outputs and 16 digital inputs. The combination of the two cards meets the acquisition requirements of the control system 100. The test system 40 includes a sensing module 41, a data processing module 42, and a PLC control module 43. The sensing module 41 includes a displacement sensor 411, a torque sensor 412, a pressure sensor 413, a temperature sensor 414, and a counter 415. The data processing module 42 is used for data display, data processing, data storage, and real-time display of the torque change curve. The sensing module 41 collects analog signals and transmits them to the data acquisition card 21 and the counter card 22. The data acquisition card 21 and the counter card 22 convert them into digital signals that can be used by the computer and transmit them into the LabVIEW control program 10. The data processing module 42 performs data display, data processing, data storage, and real-time display of the torque change curve. For the required test frequency, the LabVIEW control program 10 sends instructions to the PLC control module 43 through the RS-232 serial port, and the PLC control module 43 controls the test and test according to the test frequency and pressure.

[0027] The present invention also provides a hydraulic joint for a hose pulse test bench, which includes a joint pipe body 1. On the outer wall of one end of the joint pipe body 1, a number of uniformly distributed conical rings 11 are provided. A concave cavity 12 is formed between the conical rings 11 and the outer wall of the joint pipe body 1. By providing the conical rings 11 and the formed concave cavity 12 on the joint pipe body 1, when the hose to be tested is sleeved on the outer wall of the joint pipe body 1, the inner wall of the hose contacts the concave cavity 12, thereby improving the tightness between the hose and the joint pipe body 1. On the outside of the joint pipe body 1, a number of uniformly distributed semi-circular limiting rings 13 are provided. A wedge-shaped surface 14 is provided on the inner wall of the semi-circular limiting rings 13. The semi-circular limiting rings 13 and the wedge-shaped surface 14 are in movable contact with the concave cavity 12. By providing the semi-circular limiting rings 13, when the semi-circular limiting rings 13 are fixed in the concave cavity 12, the outer wall of the hose can be pressed, so that the hose is fixed on the outer wall of the joint pipe body 1. Two ear plates 15 are fixedly connected to each of the several semi-circular limiting rings 13. A locking screw 16 is rotatably installed by threads between two adjacent ear plates 15. Nuts 17 are rotatably installed by threads at both ends of several locking screws 16. By providing the locking screws 16 and the nuts 17, two adjacent semi-circular limiting rings 13 can be locked. A thread groove 18 is provided on the outer wall of the other end of the joint pipe body 1. By providing the thread groove 18, it is convenient to fix the joint pipe body 1 on the pipeline of the test platform 200. A hexagonal seat 19 is provided on the outer wall of the other end of the joint pipe body 1. By providing the hexagonal seat 19, it is convenient for the tester to use a wrench to rotate the joint pipe body 1 so that the joint pipe body 1 is fixed on the pipeline of the test platform 200.

[0028] Working principle: When it is necessary to test the hose assembly, first fix the hose assembly between two pressure measurement joints 90. Then, according to the inner diameter size of the hose, if the inner diameter of the hose is 22 mm (including 22 mm) or less, bend the hose between the two pressure measurement joints 90 by 180°. If the inner diameter of the hose is more than 22 mm, bend the hose between the two pressure measurement joints 90 by 90°. Subsequently, the hydraulic oil in the fuel tank 50 is sucked by the hydraulic oil pump 60. The pulse generator 70 outputs a pulse wave, and the accumulator 80 supplements the instantaneous flow required during the pulse. In the rising section, the accumulator 80 releases the stored high-pressure liquid to generate the required rising slope and peak value. During this process, the analog signal is collected by the sensing module 41 and transmitted to the data acquisition card 21 and the counter card 22. The data acquisition card 21 and the counter card 22 convert it into a digital signal available for the computer and transmit it to the LabVIEW control program 10. The data processing module 42 performs data display, data processing, data storage, and real-time display of the torque change curve. For the required test frequency, the LabVIEW control program 10 sends instructions to the PLC control module 43 through the RS-232 serial port, and the PLC control module 43 controls and tests the hose according to the test frequency and pressure. The test frequency of the LabVIEW control program 10 is adjustable from 0.5 to 100 Hz, and the adjustment range can be arbitrarily adjusted. To truly reflect the displacement signal, force signal, and pressure signal collected as the output parameters of the hydraulic system under the current given signal, the LabVIEW control program 10 can synchronously collect the signals of the sensing module 41 and the control signals sent, and perform subsequent signal processing, thereby improving the convenience and ease of operation of the hose test; The LabVIEW control program 10 includes real-time digital and graphical displays during the test. At the same time, the LabVIEW control program 10 can save the test data and test curves after the test to a specified path, where the test data is saved in the form of an Excel table, and the test curves are saved in the jpeg format, thereby providing a basis for subsequent data processing and test results during the hose test.

[0029] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and its equivalent technologies, the present invention is also intended to include these changes and modifications.

Claims

1. Hose pulse test bench, comprising a test platform (200) and a control system (100), characterized in that: The control system (100) is signal-connected to the test platform (200). The test platform (200) includes an oil tank (50), a hydraulic oil pump (60), a pulse generating device (70), an accumulator (80) and a pressure measuring joint (90), and the oil tank (50), the hydraulic oil pump (60), the pulse generating device (70), the accumulator (80) and the pressure measuring joint (90) are connected by pipelines. The control system (100) includes a LabVIEW control program (10) and a test system (40). The LabVIEW control program (10) includes a communication module (20) and a library function (30). The test system (40) includes a sensing module (41), a data processing module (42) and a PLC control module (43).

2. The hose pulse test bench according to claim 1, wherein, A check valve (61) is arranged between the oil tank (50) and the hydraulic oil pump (60).

3. The hose pulse test bench according to claim 1, characterized in that, A hydraulic directional valve (62) is arranged between the hydraulic oil pump (60) and the pulse generating device (70).

4. The hose pulse test bench according to claim 1, characterized in that, The communication module (20) includes a data acquisition card (21) and a counter card (22).

5. The hose pulse test bench according to claim 1, wherein The sensing module (41) includes a displacement sensor (411), a torque sensor (412), a pressure sensor (413), a temperature sensor (414) and a counter (415).

6. The hose pulse test bench according to claim 1, characterized in that, The data processing module (42) is used for data display, data processing, data storage and real-time display of the torque change curve.

7. A hydraulic joint applied to the hose pulse test bench according to any one of claims 1-6, comprising a joint pipe body (1), characterized in that, On the outer wall of one end of the joint pipe body (1), a number of uniformly distributed conical rings (11) are provided. A concave cavity (12) is formed between the conical rings (11) and the outer wall of the joint pipe body (1). On the outside of the joint pipe body (1), a number of uniformly distributed semi-circular limiting rings (13) are provided. A wedge-shaped surface (14) is provided on the inner wall of the semi-circular limiting ring (13). The semi-circular limiting ring (13) and the wedge-shaped surface (14) are in movable contact with the concave cavity (12). Two ear plates (15) are fixedly connected to each of the semi-circular limiting rings (13). A locking screw (16) is threadedly and rotatably installed between two adjacent ear plates (15). Nuts (17) are threadedly and rotatably installed at both ends of each of the locking screws (16). A threaded groove (18) is provided on the outer wall of the other end of the joint pipe body (1).

8. The hydraulic joint of the hose pulse test bench according to claim 7, characterized in that, A hexagonal seat (19) is provided on the outer wall of the other end of the joint pipe body (1).

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