An oil liquid ferromagnetic impurity adsorption and monitoring alarm device and its working method

Abstract

The invention discloses an oil ferromagnetic impurity adsorption and monitoring alarm device, which comprises an outer shell, a filtering mechanism and a monitoring alarm device, wherein the filtering mechanism comprises a shell, a magnet and a connecting block, and the monitoring alarm device comprises an electrical box, a power supply, a switch, an upper plate, a lower plate, a current sensing resistor, a temperature sensor, a PLC controller and an alarm, wherein the upper plate and the lower plate are respectively located on the inner side of the upper and lower sides of the shell, the magnet is located between the upper plate and the lower plate, and the right end face of the magnet, the upper plate, the lower plate, the front right side and the rear right side of the shell form a space. The working method thereof is as follows: (1) the oil ferromagnetic impurity adsorption and monitoring alarm device is connected to the downstream pipeline of the hydraulic system oil suction filter; (2) the switch is closed and the circuit works; (3) the magnet resistance value, the iron filings resistance value and the circuit current value are obtained; (4) the current value is monitored to see whether it is greater than a threshold value, and if it is greater than the threshold value, it indicates that the iron filings have reached the adsorption limit, and an alarm is given; otherwise, normal monitoring is performed in real time.

Description

Technical Field

[0001] The invention relates to an oil ferromagnetic impurity adsorption and monitoring alarm device and a working method thereof. Background Art

[0002] The quality of hydraulic oil has a great impact on the performance of the hydraulic system. Many faults are caused by it. To prevent oil contamination, install oil cleaning devices in appropriate places to intercept pollutants in the oil, keep the oil clean, and ensure the normal operation of the oil system. Inside the hydraulic system, the wear of metal components increases with the increase of usage time, and will also be accompanied by a certain degree of rust. The iron filings produced by the wear and rust of metal components will mix into the hydraulic oil, aggravating the wear of internal components and even affecting the normal operation of the entire hydraulic system.

[0003] The prior art has related designs for hydraulic oil filtering devices. For example, the Chinese invention patent number CN201210177687.7 proposes a magnetic filtering device for the high-pressure oil circuit of an excavator hydraulic system, which contains a cylinder, one end of which is closed, and a pipe joint is provided on the closed end. The other end of the cylinder has a closed screw cap, and a pipe joint is provided on the screw cap. There is a magnet bracket inside the cylinder, and a magnetic ring is inlaid on the outer ring of the magnet bracket. A filter screen and an oil filter pan are installed at the end of the magnet bracket inside the cylinder. The magnetic filtering device can adsorb fine metal particles in the hydraulic oil, so that the metal particles will not enter the oil cylinder and the system to cause wear or blockage, which prolongs the service life of the flip oil cylinder and reduces the pollution of the hydraulic oil. However, the magnetic filtering device cannot monitor the content of iron filings that have been adsorbed and cannot obtain information on whether the adsorption is saturated. Often, when it is necessary to clean the magnetic ring and / or the filter screen, it cannot be cleaned in time.

[0004] Use new content

[0005] The technical problem to be solved by the present invention is to provide an oil ferromagnetic impurity adsorption and monitoring alarm device and its working method, which can not only ensure the cleanliness of the hydraulic oil in the hydraulic system, but also monitor iron filings in real time, and alarm when the adsorption limit is reached, prompting timely disassembly and cleaning.

[0006] In order to solve the above technical problems, the present invention provides an oil ferromagnetic impurity adsorption and monitoring alarm device, which comprises an outer shell, a filtering mechanism and a monitoring alarm device. The outer shell is a through-hole structure, and the through-hole is used for circulating hydraulic oil. The two ends of the outer shell are respectively provided with an oil inlet pipe joint and an oil outlet pipe joint. The filtering mechanism comprises a shell, a magnet, and a connecting block. The shell is a cylindrical structure, the left end of the cylindrical structure is closed, and the right end is an opening. The cylindrical structure comprises an upper side, a lower side, a left side, a front side and a back side. The magnet is located in the shell, and the left end face of the magnet is against the inner side of the left side of the shell. There is a gap between the right end face of the magnet and the opening. The lower end of the connecting block is arranged on the outer side of the upper side of the shell, and the upper end of the connecting block is arranged on the upper part of the inner wall of the through-hole of the outer shell; the monitoring alarm device comprises an electrical box, a power supply, a switch, an upper pole plate, a lower pole plate, a current sensing resistor, a temperature sensor, a PLC controller and an alarm. The upper pole plate and the lower pole plate are respectively located on the inner sides of the upper side and the lower side of the shell, and the magnet is located between the upper pole plate and the lower pole plate. The right end face of the magnet, the upper pole plate, The lower electrode plate, the front right side portion and the rear right side portion of the shell form a space, one end of the switch is connected to the positive plate of the power supply through a wire, the other end of the switch is connected to the upper electrode plate through a wire, the lower electrode plate is connected to one end of the current-sensing resistor through a wire, the other end of the current-sensing resistor is connected to the negative electrode of the power supply, the current-sensing resistor is used to protect the circuit and obtain the current value of the circuit, the output end of the detection resistor is connected to the input end of the PLC controller, and the signal is transmitted to the PLC controller; the temperature sensor is used to measure the oil temperature, the output end of the temperature sensor is connected to the input end of the PLC controller, and the signal is transmitted to the PLC controller, the PLC controller is used to determine whether the current value is greater than a threshold value, if it is greater than the threshold value, the signal is transmitted to the alarm device, the alarm device is used to alarm when receiving the signal from the PLC controller, the probe of the temperature sensor is located in the through hole of the outer shell, the switch and the alarm device are arranged on the electrical box, the power supply, the current-sensing resistor and the PLC controller are all arranged inside the electrical box, and the electrical box is arranged on the outer shell.

[0007] Preferably, the connection block is a T-shaped structure, with the lower end arranged on the outer side of the shell, and the upper end of the connection block arranged on the upper part of the inner wall of the through hole of the outer shell, and the connection block and the shell are both made of plastic.

[0008] Preferably, the magnet is a neodymium iron boron magnet.

[0009] Preferably, the upper electrode plate and the lower electrode plate have the same structure and are both metal plates.

[0010] Preferably, a plurality of oil holes are provided on the front right side portion and the rear right side portion of the shell, and an oil outlet pipe is provided at the inner end of the oil inlet pipe joint, and the outlet of the oil pipe is located at the opening at the right end of the shell.

[0011] Preferably, the alarm device is a buzzer or a loudspeaker.

[0012] Based on the above-mentioned oil ferromagnetic impurity adsorption and monitoring alarm device, the present invention also provides a working method of the oil ferromagnetic impurity adsorption and monitoring alarm device, comprising the following steps:

[0013] (1) Connect the oil inlet and outlet pipe joints of the oil ferromagnetic impurity adsorption and monitoring alarm device to the downstream pipeline of the hydraulic system oil suction filter respectively:

[0014] (2) The switch is closed and the circuit starts working;

[0015] (3) The magnet resistance value calculation unit is set on the PLC controller. When the PLC controller receives the temperature signal transmitted from the temperature sensor, it obtains the current temperature value t. The PLC controller calculates the magnet resistance value R at the current time through the formula mt , the calculation formula is as follows:

[0016]

[0017] Among them, ρ m0 is the resistivity of the magnet at 0°C, a m is the temperature coefficient of magnet resistivity, l is the longitudinal distance between the upper plate and the lower plate, S m is the axial cross-sectional area of ​​the magnet from top to bottom;

[0018] The iron chip resistance limit value calculation unit is set on the PLC controller. When the PLC controller receives the temperature signal transmitted from the temperature sensor, it obtains the current temperature value t. The PLC controller calculates the current iron chip resistance limit value R by the formula it , the calculation formula is as follows:

[0019]

[0020] Among them, the axial cross-sectional area S of the iron chips at the limit of iron chips accumulation is i , ρ i0 is the resistivity of iron filings at 0°C, a i is the temperature coefficient of resistivity of iron chips;

[0021] (4) The current threshold calculation unit is set on the PLC controller. When the PLC controller calculates the current threshold I at the current time through the formula itmax , the calculation formula is as follows:

[0022]

[0023] Among them, R oth is the internal resistance of the circuit, and U is the voltage value of the circuit.

[0024] The current comparison unit set on the PLC controller, when the PLC controller receives the current signal transmitted from the current sensing resistor, obtains the current value I of the circuit at the current time, compares the circuit current value with the threshold value, and if I≤I itmax , it means that the magnet has not reached the adsorption limit at this time; if I ≥ I itmax , it means that the magnet has reached its adsorption limit and can no longer adsorb iron filings in the oil. The alarm device connected to the output end of the PLC controller transmits a signal to cause it to alarm. The alarm device sounds an alarm to remind the user to stop the hydraulic system and clean up the iron filings adsorbed on the filter mechanism in time.

[0025] The beneficial effect of the present invention is that the iron chips in the oil are filtered and purified by the filtering mechanism, and the iron chips are concentrated and adsorbed together, and the iron chips adsorbed together are monitored in real time by the monitoring and alarm device. When a certain amount is reached, an alarm is issued to remind the disassembly and cleaning in time. Therefore, the deficiency of the prior art that the amount of iron chips cannot be monitored in real time is overcome, thereby ensuring the cleanliness of the hydraulic system, reducing the wear of the internal components of the hydraulic system, and ensuring the normal operation of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a schematic diagram of the structure of a device for adsorbing and monitoring ferromagnetic impurities in oil according to the present invention;

[0027] Figure 2 yes Figure 1 A-direction structural diagram in FIG.

[0028] Figure 3 It is a structural diagram of the filtering mechanism;

[0029] Figure 4 It is a wiring diagram of the power supply, switch, upper plate, lower plate and current-sensing resistor;

[0030] Figure 5 is a control block diagram of the present invention;

[0031] Figure 6 It is a monitoring alarm flow chart of the present invention. DETAILED DESCRIPTION

[0032] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further explained below in conjunction with specific implementation methods.

[0033] In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "front end", "rear end", "two ends", "one end", "the other end" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0034] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "provided with", "connected", etc. should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0035] Please refer to Figure 1-5 As shown, the present invention provides an oil ferromagnetic impurity adsorption and monitoring alarm device, which includes an outer shell 2, a filtering mechanism and a monitoring alarm device. The outer shell 2 is a through-hole structure, and the through-hole is used to circulate hydraulic oil. The two ends of the outer shell 2 are respectively provided with an oil inlet pipe joint 6 and an oil outlet pipe joint 1. Figure 3 As shown, the filter mechanism includes a housing 13, a magnet 7, and a connecting block 8. The housing 13 is a cylindrical structure, the left end of which is closed and the right end is open. The cylindrical structure includes a top, a bottom, a left side, a front, and a back. The magnet 7 is located in the housing 13, the left end face of the magnet 7 is against the inner side of the left side of the housing 13, and there is a gap between the right end face of the magnet 7 and the opening. The lower end of the connecting block 8 is arranged on the outer side of the top of the housing 13, and the upper end of the connecting block 8 is arranged on the upper part 10 of the inner wall of the through hole of the outer housing 2. In this embodiment, the longitudinal cross-sectional area of ​​the housing 13 is a square, and the diagonal length thereof is one-half of the diameter of the through hole of the outer housing 2. The thickness of the top, bottom, left side, front, and back of the housing 13 is equal. The monitoring alarm device includes an electrical box 4, a power supply 17, a switch 3, an upper plate 11, a lower plate 12, a current sensing resistor 15, a temperature sensor 9, a PLC controller 16, and an alarm 5. The upper pole plate 11 and the lower pole plate 12 are respectively located on the inner side of the upper and lower sides of the housing 13, and the magnet 7 is located between the upper pole plate 11 and the lower pole plate 12. The right end surface of the magnet 7, the upper pole plate 11, the lower pole plate 12, the front right side portion and the rear right side portion of the housing 13 form a space. In this embodiment, the length of the magnet 7 is five sixths of the length of the housing 13, that is, the length of the above space is one sixth of the length of the housing 13. Figure 3 As shown. Figure 4 As shown, one end of the switch 3 is connected to the positive plate of the power supply 17 through a wire, the other end of the switch 5 is connected to the upper plate 11 through a wire, the lower plate 12 is connected to one end of the current-sensing resistor 15 through a wire, and the other end of the current-sensing resistor 15 is connected to the negative electrode of the power supply 17. The current-sensing resistor 15 is used to protect the circuit and obtain the current value of the circuit. The output end of the detection resistor 15 is connected to the input end of the PLC controller 16 to transmit the signal to the PLC controller 16. The temperature sensor 9 is used to measure the oil temperature. The output end of the temperature sensor 9 is connected to the input end of the PLC controller 16 to transmit the signal to the PLC controller 16. The PLC controller 16 is used to determine whether the current value is greater than a threshold value. If it is greater than the threshold value, the signal is transmitted to the alarm device 5. The alarm device 5 is used to alarm when receiving a signal from the PLC controller 16. The probe of the temperature sensor 9 is located in the through hole of the outer shell 2, as shown in FIG. Figure 2 The switch 3 and the alarm device 5 are arranged on the electrical box 4 , the power supply 17 , the current sensing resistor 15 and the PLC controller 16 are arranged inside the electrical box 4 , and the electrical box 4 is arranged on the outer shell 2 .

[0036] To optimize the structure, the connecting block 8 is a T-shaped structure, the lower end of which is arranged on the outer side of the housing 13, and the upper end of the connecting block 8 is arranged on the upper part 10 of the inner wall of the through hole of the outer housing 13. The connecting block 8 and the housing 13 are both made of plastic. In fact, in order to facilitate assembly and reduce costs, the connecting block 8 and the housing 13 can be made into an integral structure.

[0037] In order to reduce the cost, the magnet 7 is a neodymium iron boron magnet.

[0038] In order to optimize the structure and reduce the cost, the upper plate 11 and the lower plate 12 have the same structure and are both metal plates, and can be common steel plates, aluminum alloy plates or other metal plates.

[0039] In order to further improve the filtering effect, a plurality of oil holes 14 are provided on the front right side and the rear right side of the housing 13, such as Figure 3 As shown, the inner end of the oil inlet pipe joint 6 is provided with an oil outlet pipe, and the outlet of the oil pipe is located at the right end opening of the housing 13. That is to say, the hydraulic oil flowing out of the oil inlet pipe joint 6 first enters a space formed by the right end surface of the magnet 7, the upper pole plate 11, the lower pole plate 12, the front right side and the rear right side of the housing 13, the iron filings in the hydraulic oil are absorbed by the magnet 7, and the hydraulic oil flows out from the plurality of oil holes 14, which further improves the filtering effect.

[0040] In order to reduce the cost, the alarm device is a buzzer or a loudspeaker.

[0041] Based on the above-mentioned oil liquid ferromagnetic impurity adsorption and monitoring alarm device, the present invention also provides a working method of the oil liquid ferromagnetic impurity adsorption and monitoring alarm device, see Figure 6 , including the following steps:

[0042] (1) Connect the oil inlet pipe joint 6 and the oil outlet pipe joint 1 of the oil ferromagnetic impurity adsorption and monitoring alarm device to the downstream pipeline of the hydraulic system oil suction filter respectively:

[0043] (2) Switch 3 is closed and the circuit starts working;

[0044] (3) The magnet resistance value calculation unit is set on the PLC controller 16. When the PLC controller 16 receives the temperature signal transmitted from the temperature sensor 9, the current temperature value t is obtained. The PLC controller 16 calculates the magnet resistance value R at the current time by the formula mt , the calculation formula is as follows:

[0045]

[0046] Among them, ρ m0 is the resistivity of the magnet at 0°C, a m is the temperature coefficient of magnet resistivity, l is the longitudinal distance between the upper plate 11 and the lower plate 12, S m is the axial cross-sectional area of ​​the magnet 7 from top to bottom;

[0047] The chip resistance limit value calculation unit is set on the PLC controller 16. When the PLC controller 16 receives the temperature signal transmitted from the temperature sensor 9, the current temperature value t is obtained. The PLC controller 16 calculates the chip resistance limit value R at the current time by the formula it , the calculation formula is as follows:

[0048]

[0049] Among them, the axial cross-sectional area S of the iron chips at the limit of iron chips accumulation is i , ρ i0 is the resistivity of iron filings at 0°C, a i is the temperature coefficient of resistivity of iron chips;

[0050] (4) The current threshold calculation unit is set on the PLC controller 16. When the PLC controller 16 calculates the current threshold I at the current time through the formula itmax , the calculation formula is as follows:

[0051]

[0052] Among them, R oth is the internal resistance of the circuit, and U is the voltage value of the circuit.

[0053] The current comparison unit provided on the PLC controller 16 obtains the current value I of the circuit at the current time when the PLC controller 16 receives the current signal transmitted from the current sensing resistor 15, compares the circuit current value with the threshold value, and if I≤I itmax , it means that the magnet 7 has not reached the adsorption limit at this time; if I≥I itmax , it means that the magnet 7 has reached the adsorption limit and can no longer adsorb the iron filings in the oil. The alarm device 5 connected to the output end of the PLC controller 16 transmits a signal to cause it to alarm. The alarm device 5 alarms and warns, reminding the user to stop the hydraulic system and clean up the iron filings adsorbed on the filter mechanism in time.

[0054] The above-mentioned oil ferromagnetic impurity adsorption and monitoring alarm device and its working method filter and purify the iron filings in the oil through the filtering mechanism, and adsorb the iron filings together, and monitor the iron filings adsorbed together in real time through the monitoring alarm device. When a certain amount is reached, an alarm is issued to remind the disassembly and cleaning in time. Compared with the prior art, the present invention overcomes the current deficiency of not being able to monitor the amount of iron filings in real time. The present invention ensures the cleanliness of the hydraulic system, reduces the wear of the internal components of the hydraulic system, ensures the normal operation of the system, increases the service life of the system, reduces the production cost, and avoids the occurrence of sudden accidents.

[0055] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. An oil ferromagnetic impurity adsorption and monitoring alarm device, characterized in that: It contains an outer shell, a filtering mechanism and a monitoring and alarm device. The outer shell is a through-hole structure, and the through-hole is used for circulating hydraulic oil. The two ends of the outer shell are respectively provided with an oil inlet pipe joint and an oil outlet pipe joint. The filtering mechanism contains a shell, a magnet, and a connecting block. The shell is a cylindrical structure. The left end of the cylindrical structure is closed and the right end is open. The cylindrical structure contains a top, a bottom, a left side, a front and a back. The magnet is located in the shell, and the left end face of the magnet is against the inner side of the left side of the shell. There is a gap between the right end face of the magnet and the opening. The lower end of the connecting block is arranged on the outer side of the shell, and the upper end of the connecting block is arranged on the upper part of the inner wall of the through-hole of the outer shell; the monitoring and alarm device contains an electrical box, a power supply, a switch, an upper pole plate, a lower pole plate, a current sensing resistor, a temperature sensor, a PLC controller and an alarm. The upper pole plate and the lower pole plate are respectively located on the inner sides of the upper and lower sides of the shell, and the magnet is located between the upper pole plate and the lower pole plate. The right end face of the magnet, the upper pole plate, the lower pole plate, the front right side and the back of the shell The right side forms a space, one end of the switch is connected to the positive plate of the power supply through a wire, the other end of the switch is connected to the upper plate through a wire, the lower plate is connected to one end of the current-sensing resistor through a wire, the other end of the current-sensing resistor is connected to the negative pole of the power supply, the current-sensing resistor is used to protect the circuit and obtain the current value of the circuit, the output end of the detection resistor is connected to the input end of the PLC controller, and the signal is transmitted to the PLC controller; the temperature sensor is used to measure the oil temperature, the output end of the temperature sensor is connected to the input end of the PLC controller, and the signal is transmitted to the PLC controller, the PLC controller is used to determine whether the current value is greater than the threshold value, if it is greater than the threshold value, the signal is transmitted to the alarm device, the alarm device is used to alarm when receiving the signal from the PLC controller, the probe of the temperature sensor is located in the through hole of the outer shell, the switch and the alarm device are arranged on the electrical box, the power supply, the current-sensing resistor and the PLC controller are all arranged inside the electrical box, and the electrical box is arranged on the outer shell.

2. The oil ferromagnetic impurity adsorption and monitoring alarm device according to claim 1, characterized in that: The connecting block is a T-shaped structure, the lower end of which is arranged on the outer side of the shell, and the upper end of which is arranged on the upper part of the inner wall of the through hole of the outer shell. The connecting block and the shell are both made of plastic.

3. The oil ferromagnetic impurity adsorption and monitoring alarm device according to claim 1, characterized in that: The magnet is a neodymium iron boron magnet.

4. The oil ferromagnetic impurity adsorption and monitoring alarm device according to claim 1, characterized in that: The upper plate and the lower plate have the same structure and are both metal plates.

5. The oil ferromagnetic impurity adsorption and monitoring alarm device according to claim 1, characterized in that: A plurality of oil holes are arranged on the front right side and the rear right side of the shell, and an oil outlet pipe is arranged at the inner end of the oil inlet pipe joint, and the outlet of the oil pipe is located at the opening at the right end of the shell.

6. A working method of an oil ferromagnetic impurity adsorption and monitoring alarm device, comprising the following steps: (1) Connect the oil inlet and outlet pipe joints of the oil ferromagnetic impurity adsorption and monitoring alarm device to the downstream pipeline of the hydraulic system oil suction filter respectively: (2) The switch is closed and the circuit starts working; (3) The magnet resistance value calculation unit is set on the PLC controller. When the PLC controller receives the temperature signal transmitted from the temperature sensor, it obtains the current temperature value t. The PLC controller calculates the magnet resistance value R at the current time through the formula mt , the calculation formula is as follows: in, ρ m0 is the resistivity of the magnet at 0°C, a m is the temperature coefficient of magnet resistivity, l is the longitudinal distance between the upper plate and the lower plate, S m is the axial cross-sectional area of ​​the magnet from top to bottom; The iron chip resistance limit value calculation unit is set on the PLC controller. When the PLC controller receives the temperature signal transmitted from the temperature sensor, it obtains the current temperature value t. The PLC controller calculates the current iron chip resistance limit value R by the formula it , the calculation formula is as follows: Among them, the axial cross-sectional area S of the iron chips at the limit of iron chip accumulation is i , ρ i0 is the resistivity of iron filings at 0°C, a i is the temperature coefficient of resistivity of iron chips; (4) The current threshold calculation unit is set on the PLC controller. When the PLC controller calculates the current threshold I at the current time through the formula itmax , the calculation formula is as follows: Among them, R oth is the internal resistance of the circuit, and U is the voltage value of the circuit; The current comparison unit set on the PLC controller, when the PLC controller receives the current signal transmitted from the current sensing resistor, obtains the current value I of the circuit at the current time, compares the circuit current value with the threshold value, and if I≤I itmax , it means that the magnet has not reached the adsorption limit at this time; if I ≥ I itmax , it means that the magnet has reached its adsorption limit and can no longer adsorb iron filings in the oil. The alarm device connected to the output end of the PLC controller transmits a signal to cause it to alarm. The alarm device sounds an alarm to remind the user to stop the hydraulic system and clean up the iron filings adsorbed on the filter mechanism in time.

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