Multifunctional rubber diaphragm fatigue life measuring device

Abstract

The application relates to a multifunctional rubber diaphragm fatigue life measuring device applied to a large diaphragm pump. The application provides a multifunctional rubber diaphragm fatigue life measuring device which is simple in structure and convenient and practical. The application comprises a rack, characterized in that a heating oil tank is arranged in the rack through a lifting mechanism, an installation platform is arranged at the top of the rack, a driving motor is arranged on the installation platform, an output shaft of the driving motor is connected with a crankshaft, a connecting rod is rotatably arranged on the crankshaft, one end of the connecting rod is connected with one end of a medium rod, the medium rod is matched with a guide sleeve on the rack, the other end of the medium rod is provided with a diaphragm inner clamp matched with a diaphragm inner circle, a diaphragm outer clamp matched with a diaphragm outer circle is arranged on the outside of the diaphragm inner clamp on the rack, and the diaphragm inner clamp and the diaphragm outer clamp correspond to the opening position at the top of the heating oil tank.

Description

Technical Field

[0001] The invention relates to a multifunctional rubber diaphragm fatigue life measuring device applied to a large diaphragm pump. Background Art

[0002] The slurries conveyed by diaphragm pumps are currently experiencing increasing temperatures and pH levels. This makes lifespan testing of rubber diaphragms of varying diameters and process technology under various conditions particularly important during diaphragm pump design. Designing and manufacturing a comprehensive, well-structured rubber diaphragm fatigue testing device has become a key challenge in diaphragm pump design.

[0003] This is not only helpful in providing an experimental basis for improving the structural design of rubber diaphragms, but also helpful in comparing the effects of different impulse times, different temperatures and pH slurry environments on the fatigue life of diaphragms, so as to find the causes affecting the fatigue life of diaphragms and improvement measures.

[0004] Feedback from on-site users indicates that fatigue failure of rubber diaphragms is primarily caused by two factors: medium corrosion and fatigue cracking. Therefore, the design of the diaphragm fatigue life measurement device ensures that the test environment is consistent with the on-site operating environment of the diaphragm pump. This ensures that the drive mode, stroke, stroke frequency, and test rubber diaphragm thickness reflect the actual diaphragm performance of the user's on-site prototype, enabling accurate prediction of rubber diaphragm life. Summary of the Invention

[0005] The present invention aims to solve the above problems and provides a multifunctional rubber diaphragm fatigue life measuring device which is simple in structure, convenient and practical.

[0006] In order to achieve the above-mentioned purpose of the present invention, the present invention adopts the following technical scheme, which includes a frame, characterized in that: a heating oil tank is arranged in the frame through a lifting mechanism, a mounting platform is arranged on the top of the frame, a driving motor is arranged on the mounting platform, the output shaft of the driving motor is connected to a crankshaft, a connecting rod is rotatably arranged on the crankshaft, the end of the connecting rod is connected to one end of an intermediate rod, and the middle part of the intermediate rod is matched with the guide sleeve on the frame; the other end of the intermediate rod is provided with a diaphragm inner clamp that matches the inner circle of the diaphragm, and a diaphragm outer clamp that matches the outer circle of the diaphragm is provided on the outside of the diaphragm inner clamp on the frame; the diaphragm inner clamp and the diaphragm outer clamp correspond to the opening position of the top of the heating oil tank.

[0007] As a preferred solution of the present invention, a signal generating device is provided at the end of the crankshaft, and a proximity switch of the signal generating device is provided on the mounting platform.

[0008] As another preferred solution of the present invention, a fixing frame is provided on the frame, the guide sleeve is provided at the center of the fixing frame, and the diaphragm outer clamp is provided at the bottom of the fixing frame.

[0009] As a third preferred solution of the present invention, a temperature sensor, a heater and an oil level indicator are provided in the heating oil tank; the temperature sensor, the heater and the oil level indicator are all connected to a PLC controller.

[0010] The beneficial effects of the present invention are as follows: 1. The present invention has a novel structure, is easy to use and operate.

[0011] 2. The present invention has strong operational stability and can simulate the operating conditions (high temperature, strong pH) of the user's on-site slurry environment, thereby accurately evaluating the service life of the rubber diaphragm.

[0012] 3. In addition to the crankshaft and connecting rod, the main structure of the present invention can be made of welded steel plates and annealed to eliminate internal stress, which is low in cost and convenient for replacing the support sleeve. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic structural diagram of the folded state of the present invention.

[0014] In the accompanying drawings, 1 is a lifting mechanism, 2 is a frame, 3 is a heating oil tank, 4 is a diaphragm outer clamp, 5 is a fixing frame, 6 is a guide sleeve, 7 is a driving motor, 8 is a crankshaft, 9 is a connecting rod, 10 is an intermediate rod, 11 is a diaphragm inner clamp, 12 is a test piece diaphragm, 13 is a handle, 14 is a lifting frame, 15 is a folding frame, 16 is a mounting platform, 17 is a signal generating device, and 18 is a proximity switch. DETAILED DESCRIPTION

[0015] The present invention includes a frame 2, which is characterized in that: a heating oil tank 3 is arranged in the frame 2 through a lifting mechanism 1, a mounting platform 16 is arranged on the top of the frame 2, a driving motor 7 is arranged on the mounting platform 16, the output shaft of the driving motor 7 is connected to a crankshaft 8, a connecting rod 9 is rotatably arranged on the crankshaft 8, the end of the connecting rod 9 is connected to one end of an intermediate rod 10, and the middle part of the intermediate rod 10 is matched with the guide sleeve 6 on the frame 2; the other end of the intermediate rod 10 is provided with a diaphragm inner clamp 11 that matches the inner circle of the diaphragm, and a diaphragm outer clamp 4 that matches the outer circle of the diaphragm is provided on the outside of the diaphragm inner clamp 11 on the frame 2; the diaphragm inner clamp and the diaphragm outer clamp 4 correspond to the opening position of the top of the heating oil tank 3.

[0016] As a preferred solution of the present invention, a signal generating device 17 is provided at the end of the crankshaft 8 , and a proximity switch 18 of the signal generating device 17 is provided on the mounting platform 16 .

[0017] As another preferred solution of the present invention, a fixing frame 5 is provided on the frame 2 , the guide sleeve 6 is provided at the center of the fixing frame 5 , and the diaphragm outer clamp 4 is provided at the bottom of the fixing frame 5 .

[0018] As a third preferred solution of the present invention, a temperature sensor, a heater and an oil level indicator are provided in the heating oil tank 3; the temperature sensor, the heater and the oil level indicator are all connected to a PLC controller.

[0019] The lifting mechanism 1 includes a lifting frame 14, a screw rod is provided in the middle of the lifting frame 14, a handle 13 connected to the screw rod is provided on the outside of the lifting frame 14, a fixed sleeve and a movable nut are provided on the screw rod, a folding frame 15 is provided on the fixed sleeve and the movable nut, the upper part of the lifting frame 14 is connected to the upper end of the folding frame 15, and the lower end of the folding frame 15 is connected to the lower part of the lifting frame 14.

[0020] The present invention is a multifunctional rubber diaphragm fatigue life measuring device for large diaphragm pumps. Figure 1 shown.

[0021] The present invention utilizes a slider-crank mechanism. The rotational motion output by the main shaft of the drive motor 7 is converted into linear reciprocating motion via the crankshaft 8 and connecting rod 9. This reciprocating motion is then transmitted to the internal diaphragm fixture 11 of the test diaphragm via an intermediate rod 10, which guides the slider. This driving force causes the test diaphragm to reciprocate up and down in a sinusoidal manner. The ball head on the outer circumference of the test diaphragm is mounted and fixed to the frame 2 via the external diaphragm fixture and placed in the oil tank, simulating actual operating conditions. The frame 2 can be welded from steel plates, annealed after welding to eliminate internal stresses, resulting in low cost and easy welding and machining.

[0022] The motor can be a 6-pole, three-phase AC asynchronous variable-frequency motor. The set test stroke value can be achieved by adjusting the frequency. The motor can be mounted horizontally, and the working connecting rod 9's force is composed of the weight and resistance of the entire set of kinematic pairs. The crankshaft 8 can adopt a single-bend support structure with eccentric counterweights to align the center of mass of the entire set of kinematic pairs on the horizontal X-axis to ensure smooth operation. Strength analysis is performed to control maximum stress and flexural deformation.

[0023] A signal generating device 17 is provided at the end of the crankshaft 8, and a proximity switch 18 collects signals. The counting can be controlled by a PLC to realize the data collection function, that is, to obtain the service life of the test piece diaphragm.

[0024] The clamping and pressing of the test piece diaphragm of the present invention completely simulates the actual installation method of the diaphragm, and two diaphragm test pieces can be tested at one time, which is convenient for accumulating test data.

[0025] The fuel tank of this invention provides a high-temperature medium transport environment for the experiment. It is equipped with two 3kW heaters, a temperature sensor, and an oil level indicator. The PLC uses the temperature sensor to control the heater's start and stop, maintaining the operating temperature within the range of 200-220°C. A layer of aluminosilicate cotton insulation can be wrapped around the tank to reduce heat exchange between the tank and the external environment.

[0026] The present invention is provided with a lifting mechanism 1, which facilitates the replacement of the test piece diaphragm and enables the inspection of the test piece state without contacting the high-temperature zone.

[0027] In addition, the present invention can adopt electrical control to realize functions such as remote control of start and stop, frequency modulation, automatic temperature control and data acquisition.

[0028] The precautions before starting are as follows.

[0029] (1) Manual turning to ensure the flexibility of moving parts.

[0030] (2) The detection control signal and feedback signal are stable and sensitive.

[0031] (3) Fill the bearings and joints with grease.

[0032] (4) Ensure that the oil level reaches the height specified by the cursor.

[0033] (5) All safety covers must be installed before operation.

[0034] It can be understood that the above specific description of the present invention is only used to illustrate the present invention and is not limited to the technical solutions described in the embodiments of the present invention. Those skilled in the art should understand that the present invention can still be modified or replaced by equivalents to achieve the same technical effects; as long as the use requirements are met, they are within the scope of protection of the present invention.

Claims

1. A multifunctional rubber diaphragm fatigue life measuring device, comprising a frame (2), characterized in that: A heating oil tank (3) is provided in the frame (2) through a lifting mechanism (1), a mounting platform (16) is provided on the top of the frame (2), a driving motor (7) is provided on the mounting platform (16), an output shaft of the driving motor (7) is connected to a crankshaft (8), a connecting rod (9) is rotatably provided on the crankshaft (8), an end of the connecting rod (9) is connected to one end of an intermediate rod (10), a middle portion of the intermediate rod (10) is matched with a guide sleeve (6) on the frame (2); a diaphragm inner clamp (11) matched with the inner circle of the diaphragm is provided at the other end of the intermediate rod (10), a diaphragm outer clamp (4) matched with the outer circle of the diaphragm is provided on the outside of the diaphragm inner clamp (11) on the frame (2); the diaphragm inner clamp and the diaphragm outer clamp (4) correspond to the opening position of the top of the heating oil tank (3); The crankshaft (8) is provided with a signal generating device (17) at its end, and a proximity switch (18) of the signal generating device (17) is provided on the mounting platform (16); A fixing frame (5) is provided on the frame (2), the guide sleeve (6) is provided at the center of the fixing frame (5), and the diaphragm outer clamp (4) is provided at the bottom of the fixing frame (5); The heating oil tank (3) is provided with a temperature sensor, a heater and an oil level indicator; the temperature sensor, the heater and the oil level indicator are all connected to a PLC controller.

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