A hydraulic oil oxidation life measuring device

Abstract

This utility model relates to the field of hydraulic oil testing technology for engineering machinery, specifically a hydraulic oil oxidation life testing device. The device includes a main body with an outer frame. An equipment cavity is formed inside the outer frame, and an oil tank is fixed to the bottom of the equipment cavity. In this utility model, during a circulation simulation process in a circulating pipeline, a plunger pump, in conjunction with this testing device, can simulate the operating conditions of engineering machinery equipment. Hydraulic oil oxidation durability tests are conducted under high temperature, high pressure, ventilation, and the presence of a Cu catalyst. By examining indicators such as changes in oil viscosity, increase in acid value, sludge formation, and remaining oxidation life, the device can monitor the performance change trend during oil degradation, comprehensively evaluate the oxidation durability of the hydraulic oil, predict the service life of the oil in the equipment, thereby reflecting the true lifespan of the oil, improving evaluation efficiency, and also enabling comparative experiments with multiple samples, which is more conducive to the screening of oil formulations.

Description

Technical Field

[0001] This utility model relates to the field of hydraulic oil testing technology for engineering machinery, specifically a hydraulic oil oxidation life testing device. Background Technology

[0002] Currently, hydraulic systems in construction machinery are trending towards higher pressure, smaller size, higher power, and longer lifespan. Hydraulic systems generally operate in high-pressure and high-temperature environments, where the hydraulic fluid continuously endures mechanical shear and thermal stress, accelerating molecular chain breakage and free radical generation. Under oxygen-containing conditions, when the hydraulic fluid comes into contact with metal catalysts, it triggers a chain oxidation reaction, producing acidic substances such as carboxylic acids and ketones, as well as colloidal precipitates. This causes the hydraulic oil circulation speed to increase and the oil temperature to rise, placing higher demands on the performance and lifespan of the hydraulic oil. Modern industry demands long-cycle and high-reliability hydraulic systems, while traditional experience-based oil change strategies are prone to resource waste or equipment damage. Therefore, oxidation life testing can quantify the remaining antioxidant capacity of the hydraulic fluid and reduce the risk of unplanned downtime caused by oil oxidation.

[0003] Currently, the main methods for testing hydraulic oils are to measure parameters such as acid value and viscosity index changes, as well as to quantify the degree of oxidation. The methods for assessing the oxidation life of oils often include the rotating oxygen bomb method, the oxidation method, and the differential pressure scanning calorimetry. The rotating oxygen bomb method detects the oxidation process of oil by placing the oil sample in an oxygen-filled sealed oxygen bomb. After heating, the oil sample is accelerated to contact with oxygen by rotating the oxygen bomb, simulating the oxidation process of oil under high temperature, oxygen, and metal catalysis. By detecting the pressure change inside the oxygen bomb, the oxidation induction period, that is, the time when the oil undergoes a significant oxidation reaction, is recorded.

[0004] The rotating oxygen bomb method used in the above-mentioned oil testing can clearly distinguish different types of antioxidants, but it is difficult to reflect the true life of the oil. It only relies on the rotation of the oxygen bomb instrument to fully contact oxygen with the oil to simulate exposure to high temperature and oxygen, which is difficult to intuitively reflect the performance changes of the oil during use.

[0005] To address the aforementioned problems, we propose a hydraulic oil oxidation life testing device. Utility Model Content

[0006] The purpose of this invention is to provide a hydraulic oil oxidation life testing device to solve the problems mentioned in the background art.

[0007] In view of this, the purpose of this utility model is to provide a hydraulic oil oxidation life testing device. By using a testing device equipped with a plunger pump to operate the oil circuit circulation structure, the normal operating state of hydraulic engineering machinery is simulated. In this way, the testing method can be used to accurately detect and judge the hydraulic oil, comprehensively evaluate the oxidation durability of the hydraulic oil, and predict the service life of the oil in the equipment.

[0008] To achieve the above objectives, this utility model provides the following technical solution: a hydraulic oil oxidation life testing device, characterized in that: it includes a main body, the main body includes an outer frame, the outer frame has an internal equipment cavity, a protective door is engaged with one side of the equipment cavity, an oil tank is fixed to the bottom of the equipment cavity, an oil inlet is provided on one side of the top surface of the oil tank, an oil outlet is provided on the other side of the top surface of the oil tank, an oil storage chamber is provided inside the oil tank, a copper catalytic coil is provided inside the oil storage chamber, and an electric heating rod is provided on the top surface of the copper catalytic coil. One end of the electric heating rod is connected to a control panel. A circulation pipe is fixed to the top surface of the oil tank. A baffle is fixed to the top of the circulation pipe. An air flow regulator is connected to the top of the circulation pipe in sequence. A plunger pump is installed on the top of the air flow regulator. A motor is shaft-connected to one side of the plunger pump. A pressure gauge is connected to the top of the plunger pump through the circulation pipe. An overflow valve is installed on one side of the pressure gauge. A pressure relief pipe is connected to the bottom of the overflow valve. A filter is connected to one end of the overflow valve. A cooler is connected to the bottom of the filter.

[0009] Furthermore, the bottom of the outer frame is fixedly connected to the oil tank, and the electric heating rods are arranged at equal intervals along the oil storage cavity inside the oil tank.

[0010] Furthermore, the top surface of the oil tank is connected to the circulation pipeline on both sides, and the circulation pipeline is fixedly connected to the inner wall of the outer frame through the baffle platform.

[0011] Furthermore, the circulation pipeline is sequentially connected to the air flow regulator, plunger pump, overflow valve, filter, and cooler.

[0012] Furthermore, the measuring mechanism includes a fixed frame, one end of which is fixed to one side of the circulation pipeline, and the other end of which is fixed to a rotating oxygen bomb measuring instrument. The bottom end of the rotating oxygen bomb measuring instrument is connected to a sampling tube, and a timed pump is connected inside the sampling tube. The bottom end of the sampling tube is connected to an oil tank.

[0013] Furthermore, the rotating oxygen bomb measuring instrument is connected to the inside of the oil tank via a sampling tube, and the sampling tube is fixedly connected to the timed pump.

[0014] Compared with the prior art, the beneficial effects of this utility model are:

[0015] In this invention, during the circulation simulation of the circulating pipeline, the testing device equipped with a plunger pump can simulate the working conditions of engineering machinery equipment. Hydraulic oil oxidation durability tests are conducted under high temperature, high pressure, ventilation, and the presence of a catalyst. By examining indicators such as changes in oil viscosity, increase in acid value, sludge formation, and remaining oxidation life, the performance change trend during oil degradation can be monitored, comprehensively evaluating the hydraulic oil oxidation durability and predicting the oil's service life in the equipment, thus reflecting the oil's true lifespan. Compared to traditional oxygen bomb instrument simulation, its simulation conditions are more comprehensive, allowing for a more complete evaluation of the actual parameters of the tested oil, improving evaluation efficiency. It also allows for comparative experiments with multiple samples, facilitating the selection of oil formulations.

[0016] In this invention, the bottom of the sampling tube is connected to the oil tank, allowing for intermittent sampling of oil samples during the cyclic simulation process, in conjunction with the set time of the timed pump. The oil samples are then tested in conjunction with the rotating oxygen bomb detector connected at the top, completing the auxiliary testing process during the cyclic simulation, achieving both simulation and rapid testing effects, and reducing the frequency of manual operation.

[0017] In this invention, the cyclic simulation method of the device can be used not only for testing the oxidation life of finished oil products, but also for formula screening in oil product research and development, and the overall cyclic structure is stable. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the three-dimensional structure of the main body of this utility model;

[0019] Figure 2 This is a schematic diagram of the three-dimensional structure of the circulating oil circuit of this utility model;

[0020] Figure 3 This is a schematic diagram of the three-dimensional internal structure of the fuel tank of this utility model;

[0021] Figure 4 This is a three-dimensional structural diagram of the measuring mechanism of this utility model.

[0022] Reference numerals: 1. Main body; 101. Outer frame; 102. Equipment cavity; 103. Protective gantry; 104. Oil tank; 105. Oil inlet; 106. Oil outlet; 107. Oil storage chamber; 108. Copper catalytic coil; 109. Electric heating rod; 110. Control panel; 111. Circulation pipeline; 112. Baffle platform; 113. Air flow regulator; 114. Plunger pump; 115. Motor; 116. Pressure gauge; 117. Overflow valve; 118. Pressure relief pipe; 119. Filter; 120. Cooler; 2. Measuring mechanism; 201. Fixing frame; 202. Rotating oxygen bomb measuring instrument; 203. Sampling tube; 204. Timer pump. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0024] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0025] The features and performance of this utility model will be further described in detail below with reference to the embodiments.

[0026] As attached Figure 1-4 As shown, a hydraulic oil oxidation life testing device includes a main body 1, which includes an outer frame 101. An equipment cavity 102 is provided inside the outer frame 101. A protective door 103 is engaged with one side of the equipment cavity 102. An oil tank 104 is fixed to the bottom of the equipment cavity 102. An oil inlet 105 is provided on one side of the top surface of the oil tank 104, and an oil outlet 106 is provided on the other side of the top surface of the oil tank 104. An oil storage chamber 107 is provided inside the oil tank 104. A copper catalytic coil 108 is installed inside the oil storage chamber 107. An electric heating rod 109 is installed on the top surface of the copper catalytic coil 108. One end of the electric heating rod 109 is connected to a control panel 1. 10. A circulation pipe 111 is fixed on the top surface of the oil tank 104. A baffle platform 112 is fixed at the top of the circulation pipe 111. An air flow regulator 113 is connected to the top of the circulation pipe 111 in sequence. A plunger pump 114 is installed at the top of the air flow regulator 113. A motor 115 is shaft-connected to one side of the plunger pump 114. A pressure gauge 116 is connected to the top of the plunger pump 114 through the circulation pipe 111. An overflow valve 117 is installed on one side of the pressure gauge 116. A pressure relief pipe 118 is connected to the bottom of the overflow valve 117. A filter 119 is connected to one end of the overflow valve 117. A cooler 120 is connected to the bottom of the filter 119.

[0027] The aforementioned hydraulic oil oxidation life testing equipment consists of an outer frame 101 and an internal oil circuit circulation structure. The oil circuit circulation structure is mainly provided with a mounting environment through the equipment cavity 102 opened in the outer frame 101. A protective gantry 103 is installed at the external opening of the equipment cavity 102. The protective gantry 103 is woven with wire mesh to protect the internal oil circuit structure. One side of the protective gantry 103 can be connected by a snap-fit ​​or shaft joint to facilitate opening and closing, and to extract and test hydraulic oil samples in the internal circulation oil circuit.

[0028] The oil circuit circulation structure component mentioned above is mainly composed of an air flow regulator 113, a plunger pump 114, an overflow valve 117, a filter 119, and a cooler 120 connected in series on the circulation pipeline 111. The oil tank 104 connected to the bottom of the circulation pipeline 111 is kept in a connected state to provide a simulated operating environment for the simulated hydraulic use of the oil circuit. The oil tank 104 itself is fixed to the bottom of the outer frame 101. By setting it at the bottom, the bottom is kept stable and it is convenient to add and extract sample hydraulic oil.

[0029] To simulate the actual application of hydraulic oil under different temperature conditions, such as Figure 3 As shown, multiple sets of electric heating rods 109 are arranged in the oil storage chamber 107 inside the oil tank 104, and each set of electric heating rods 109 is connected to the control panel 110. By connecting to an external power supply, the heating of the electric heating rods 109 can be adjusted through the control panel 110 to provide the temperature of the hydraulic oil inside the oil tank 104, thereby simulating the circulation of hydraulic oil under different temperature environments. The copper catalytic coil 108 set inside the oil tank 104 can accelerate the oxidation reaction, thereby simulating actual working conditions. At the same time, in this oil testing system, the copper coil is used as a standardized catalyst, which can achieve the repeatability and controllability of experimental conditions, and provide a unified benchmark for comparing the thermal stability of hydraulic oils with different formulations.

[0030] To ensure safety during the cyclic operation, such as Figure 2 As shown, in the circulation pipeline 111 connected to the top surface of the oil tank 104, the circulation pipeline 111 forms a partition section in the upper structure through a fixed baffle platform 112, which separates the air flow regulator 113, plunger pump 114, overflow valve 117, filter 119 and cooler 120 connected in series at the top of the circulation pipeline 111 from the oil tank 104 connected to the bottom, forming two spaces. This provides protection for the operation and control of the equipment and the sampling inspection of hydraulic oil samples, and reduces interference.

[0031] During the circulation simulation process of the aforementioned circulation pipeline 111, the working conditions of engineering machinery equipment can be simulated by using the plunger pump 114, in conjunction with the test bench and testing methods of this circulation oil system. Under high temperature, high pressure, ventilation and catalyst conditions, hydraulic oil oxidation durability tests can be conducted. By examining indicators such as changes in oil viscosity, increase in acid value, sludge formation, and remaining oxidation life, the performance change trend during oil degradation can be monitored, the oxidation durability of hydraulic oil can be comprehensively evaluated, and the service life of the oil in the equipment can be predicted, thereby reflecting the true life of the oil, improving the evaluation efficiency, and allowing for comparative experiments of multiple samples, which is more conducive to the screening of oil formulations.

[0032] The above-mentioned cyclic simulation method can be used not only for testing the oxidation life of finished oil products, but also for formula screening in oil product research and development. In addition, this bench test can also be used to examine the shear stability of multi-stage hydraulic oils during the decay process.

[0033] As attached Figure 2-4 The measuring mechanism 2 includes a fixed frame 201. One end of the fixed frame 201 is fixed to one side of the circulation pipeline 111, and the other end of the fixed frame 201 is fixed with a rotating oxygen bomb measuring instrument 202. The bottom end of the rotating oxygen bomb measuring instrument 202 is connected to a sampling tube 203. The sampling tube 203 is connected to a timed pump 204. The bottom end of the sampling tube 203 is connected to an oil tank 104.

[0034] The above structure is connected to the oil tank 104 through the bottom of the sampling tube 203. During the cyclic simulation, the oil sample can be sampled intermittently in conjunction with the set time of the timer pump 204. The oil sample is then tested in conjunction with the rotating oxygen bomb tester 202 connected at the top, thus completing the auxiliary detection process during the cyclic simulation, achieving simulation and rapid detection effects, and reducing the frequency of manual operation.

[0035] In summary, the hydraulic oil oxidation life testing device provided by this utility model first requires the user to add hydraulic oil to the tank 104 through the inlet 105, with an initial oil volume of 13L. Then, the inlet 105 and outlet 106 are sealed. The electric heating rod 109 is then powered via the control panel 110 to heat and simulate the oil temperature in the reservoir 107, maintaining the temperature within (80±5)℃. Subsequently, the plunger pump 114 is started at a speed of 1500 r / min, with a displacement of 10.3 cm³ / min. 3The hydraulic oil sample is extracted from the reservoir 107 and discharged through the circulation pipeline 111. Upon passing through the air flow regulator 113, it is replenished according to the set air flow rate of 1.0 L / h. Then, it is continuously pumped under pressure and enters the overflow valve 117. The user can monitor the pressure gauge 116 to ensure the circulation pressure remains stable within the threshold. When the pressure increases, the overflow valve 117 discharges a portion of the hydraulic oil back to the reservoir 107 through the pressure relief pipe 118, maintaining a stable circulation process. The hydraulic oil then enters the filter 119 for filtration, and after cooling by the cooler 120, it returns to the oil tank 104, completing the simulated use of the hydraulic oil. Following the experimental measurement method, a specified actual circulation process is performed, and then the measurement experiment can be conducted. The timed pump 204 can be activated during the set operating time period. The timed pump 204 creates suction, drawing the circulating hydraulic oil from the bottom oil tank 104 through the sampling pipe 203 to the rotating oxygen bomb detector 202 for testing.

[0036] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A hydraulic oil oxidation life testing device, characterized in that: The device includes a main body (1), an internal measuring mechanism (2) connected to the main body (1), an outer frame (101) inside the outer frame (101), an equipment cavity (102) inside the outer frame (101), a protective door frame (103) engaged on one side of the equipment cavity (102), an oil tank (104) fixed to the bottom of the equipment cavity (102), an oil inlet (105) on one side of the top surface of the oil tank (104), an oil outlet (106) on the other side of the top surface of the oil tank (104), an oil storage chamber (107) inside the oil tank (104), a copper catalytic coil (108) inside the oil storage chamber (107), an electric heating rod (109) on the top surface of the copper catalytic coil (108), and a control panel connected to one end of the electric heating rod (109). 110), the top surface of the oil tank (104) is fixed with a circulation pipe (111), the top end of the circulation pipe (111) is fixed with a baffle platform (112), the top of the circulation pipe (111) is connected in sequence with an air flow regulator (113), the top of the air flow regulator (113) is provided with a plunger pump (114), a motor (115) is shaft-connected to one side of the plunger pump (114), the top of the plunger pump (114) is connected with a pressure gauge (116) through the circulation pipe (111), an overflow valve (117) is provided on one side of the pressure gauge (116), a pressure relief pipe (118) is connected to the bottom end of the overflow valve (117), a filter (119) is connected to one end of the overflow valve (117), and a cooler (120) is connected to the bottom end of the filter (119).

2. The hydraulic oil oxidation life measuring apparatus according to claim 1, characterized by: The bottom of the outer frame (101) is fixedly connected to the oil tank (104), and the electric heating rods (109) are arranged at equal intervals along the oil storage chamber (107) inside the oil tank (104).

3. The apparatus for measuring the oxidation life of hydraulic oil according to claim 1, wherein: The top surface of the oil tank (104) is connected to the circulation pipeline (111) on both sides, and the circulation pipeline (111) is fixedly connected to the inner wall of the outer frame (101) through the baffle platform (112).

4. The hydraulic oil oxidation life testing device according to claim 1, characterized in that: The circulation pipeline (111) is sequentially connected to the air flow regulator (113), the plunger pump (114), the overflow valve (117), the filter (119), and the cooler (120).

5. The apparatus for measuring the oxidation life of hydraulic oil according to claim 1, wherein: The measuring mechanism (2) includes a fixed frame (201), one end of which is fixed to one side of the circulation pipeline (111), and the other end of the fixed frame (201) is fixed to a rotating oxygen bomb measuring instrument (202). The bottom end of the rotating oxygen bomb measuring instrument (202) is connected to a sampling tube (203), and the inside of the sampling tube (203) is connected to a timed pump (204). The bottom end of the sampling tube (203) is connected to an oil tank (104).

6. The apparatus for measuring the oxidation life of hydraulic oil according to claim 5, wherein: The rotating oxygen bomb tester (202) is connected to the inside of the oil tank (104) through the sampling tube (203), and the sampling tube (203) is fixedly connected to the timed pump (204).

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