Differential pressure switch detection system for grease lubrication system

Abstract

A differential pressure switch detection system for a dry oil lubrication system comprises an oil inlet pipe and an oil outlet pipe, a dry oil pump is arranged on the oil outlet pipe, the oil inlet pipe is connected with the oil inlet side of a reversing valve, the oil inlet side of the reversing valve is connected with a second electromagnetic stop valve, and the oil outlet pipe is connected with the oil outlet side of the reversing valve. The oil outlet side of the reversing valve is connected with the first electromagnetic stop valve; the first electromagnetic stop valve is connected with the first pressure regulating valve and one end of the to-be-tested pressure difference switch, the second electromagnetic stop valve is connected with the second pressure regulating valve and the other end of the to-be-tested pressure difference switch, and the first pressure regulating valve and the second pressure regulating valve are connected to the storage oil cylinder. The technical problem to be solved by the utility model is to provide a differential pressure switch detection system for a dry oil lubrication system, and the problem that a differential pressure switch is inconvenient to detect before being installed and used is solved.

Description

Technical Field

[0001] This utility model relates to the field of dry oil lubrication technology for ship locks, and in particular to a differential pressure switch detection system for dry oil lubrication systems. Background Technology

[0002] Since its opening to navigation, the Gezhouba Dam ship lock has seen a continuous increase in cargo throughput, making a direct contribution to the development of Yangtze River shipping. However, with the lock operating at high efficiency 24 hours a day, the wear and tear on large mechanical equipment has intensified.

[0003] The dry grease lubrication system provides excellent lubrication for the miter gates and their opening and closing mechanisms, as well as the anti-arc gates and other large mechanical equipment in the Gezhouba Dam lock, forming the foundation for the lock's efficient and stable operation. The dry grease lubrication system of the Gezhouba Dam lock can be divided into a dual-line centralized lubrication system, a multi-line centralized lubrication system, and a single-line centralized lubrication system. The dual-line centralized lubrication system is the most complex, containing a large number of components, and most failures in the Gezhouba Dam lock's dry grease system originate from this system. This dual-line centralized lubrication system mainly consists of a BS-B dry grease pump, a two-position four-way directional valve, a differential pressure switch, a dual-line distributor, and two oil supply pipelines. When the BS-B pump starts, it delivers high-pressure grease to the lubrication system. When the two-position four-way directional valve receives a reversing electrical signal, it alternately injects grease into the two pipelines. The dual-line distributor is connected in parallel to the two pipelines, and through the two alternately supplied oil pipelines, it pushes its working piston and control piston, delivering grease into the branch pipelines and ultimately reaching each lubrication point. The differential pressure switch sends an electrical signal based on the pressure difference between the two pipelines. When the pressure reaches the set value, it sends a signal to control the directional valve to switch directions. The lubrication of the dual-line centralized lubrication system is achieved through the close cooperation of all components.

[0004] In routine maintenance of dual-line centralized lubrication systems, the sheer number of components involved and the inability to effectively test newly replaced spare parts make fault localization complex and repetitive. Differential pressure switch malfunctions are particularly problematic, with high failure rates, difficult adjustment, and a lack of testing facilities for newly purchased spare parts. Sometimes, even substandard spare parts can prevent maintenance from proceeding smoothly. Therefore, designing and manufacturing a dedicated maintenance system for differential pressure switches in dual-line centralized lubrication systems is crucial for resolving these issues. Summary of the Invention

[0005] The technical problem to be solved by this utility model is to provide a differential pressure switch detection system for dry oil lubrication systems, thereby solving the problem of inconvenience in testing differential pressure switches before installation and use.

[0006] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is: a differential pressure switch detection system for a dry oil lubrication system, including an oil inlet pipe and an oil outlet pipe, with a dry oil pump installed on the oil outlet pipe.

[0007] The oil inlet pipe is connected to the oil inlet side of the reversing valve, and the oil inlet side of the reversing valve is then connected to the second solenoid shut-off valve. The oil outlet pipe is connected to the oil outlet side of the reversing valve, and the oil outlet side of the reversing valve is then connected to the first solenoid shut-off valve.

[0008] The first electromagnetic shut-off valve is connected to one end of the first pressure regulating valve and the differential pressure switch to be measured, the second electromagnetic shut-off valve is connected to the other end of the second pressure regulating valve and the differential pressure switch to be measured, and the first pressure regulating valve and the second pressure regulating valve are then connected to the storage cylinder.

[0009] Preferably, the first electromagnetic shut-off valve and the second electromagnetic shut-off valve are connected to the buffer pipeline, and then connected to the differential pressure switch to be measured, the first pressure regulating valve and the second pressure regulating valve.

[0010] Preferably, the first electromagnetic shut-off valve and the second electromagnetic shut-off valve are also connected to the first shut-off valve and the second shut-off valve, respectively, and the first shut-off valve and the second shut-off valve are then connected to the storage cylinder.

[0011] Preferably, a third hydraulic transmitter and a second hydraulic transmitter are respectively connected between the first electromagnetic shut-off valve and the second electromagnetic shut-off valve and the buffer pipeline.

[0012] Preferably, a safety valve is provided between the oil inlet pipe and the oil outlet pipe.

[0013] Preferably, a first oil pressure transmitter is connected to the oil outlet pipe.

[0014] Preferably, the ends of the oil inlet pipe and the oil outlet pipe are connected to the oil storage cylinder.

[0015] Preferably, the differential pressure switch to be tested is connected to the detection system via a connector.

[0016] This utility model provides a differential pressure switch detection system for dry oil lubrication systems, which has the following advantages:

[0017] 1. Ensure that the differential pressure switch sends signals normally so that the directional valve can switch normally, thereby stabilizing the system pressure.

[0018] 2. Reduce the testing steps for differential pressure switches under normal operating conditions, thereby improving work efficiency.

[0019] 3. Ensure proper closure of the oil circuit to reduce safety hazards caused by excessive oil pressure and improve the safety of the dry oil lubrication system. Attached Figure Description

[0020] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0021] Figure 1 This is a schematic diagram of the structure of this utility model. Detailed Implementation

[0022] like Figure 1 As shown, a differential pressure switch detection system for a dry oil lubrication system includes an oil inlet pipe 1 and an oil outlet pipe 2, with a dry oil pump 10 installed on the oil outlet pipe 2.

[0023] The inlet pipe 1 is connected to the inlet side of the directional control valve 3, which in turn is connected to the second solenoid shut-off valve 5. The outlet pipe 2 is connected to the outlet side of the directional control valve 3, which in turn is connected to the first solenoid shut-off valve 4. The function of the directional control valve 3 is to control the direction of the oil circuit, realizing the switching between forward and reverse flow of the oil, thereby controlling the operation of the hydraulic system. The function of the first solenoid shut-off valve 4 and the second solenoid shut-off valve 5 is to control the on / off of the oil circuit, playing a role in controlling the oil flow rate and volume in the dry oil system.

[0024] The first electromagnetic shut-off valve 4 is connected to one end of the first pressure regulating valve 6 and the differential pressure switch 8 to be measured. The second electromagnetic shut-off valve 5 is connected to the other end of the second pressure regulating valve 7 and the differential pressure switch 8 to be measured. The first pressure regulating valve 6 and the second pressure regulating valve 7 are then connected to the storage cylinder 9. The first pressure regulating valve 6 and the second pressure regulating valve 7 are flow regulating devices for adjusting the oil pressure in the inlet and outlet oil circuits. When the oil circuit pressure is too high, the pressure is released through the pressure regulating valves to allow the oil to flow back to the cylinder, ensuring the safe and stable operation of the system.

[0025] Preferably, the first electromagnetic shut-off valve 4 and the second electromagnetic shut-off valve 5 are connected to the buffer pipeline 11, and then connected to the differential pressure switch 8 to be measured, the first pressure regulating valve 6 and the second pressure regulating valve 7.

[0026] Preferably, the first electromagnetic shut-off valve 4 and the second electromagnetic shut-off valve 5 are also connected to the first shut-off valve 12 and the second shut-off valve 13, respectively, and the first shut-off valve 12 and the second shut-off valve 13 are then connected to the storage cylinder 9. The functions of the first shut-off valve 12 and the second shut-off valve 13 are to unload and control the flow rate; they have an opening and closing function on the oil circuit and can adjust the system pressure value.

[0027] Preferably, a third hydraulic pressure transmitter 15 and a second hydraulic pressure transmitter 14 are respectively connected between the first electromagnetic shut-off valve 4 and the second electromagnetic shut-off valve 5 and the buffer pipeline 11. The oil circuits on both sides of the third hydraulic pressure transmitter 15 and the second hydraulic pressure transmitter 14 can be used alternately as oil outlet circuits and oil return circuits. The two transmitters can measure the oil circuit pressure on their respective sides to provide an overpressure relief signal for the reversing valve.

[0028] Preferably, a safety valve 17 is provided between the oil inlet pipe 1 and the oil outlet pipe 2. The safety valve 17 is mainly used to open when the system pressure exceeds the limit, allowing oil to return to the oil cylinder and ensuring the safe operation of the system.

[0029] Preferably, a first oil pressure transmitter 16 is connected to the oil outlet pipe 2. The function of the first oil pressure transmitter 16 is to measure the system oil pressure, promptly reflect the system pressure value, and provide information on the system operating status.

[0030] Preferably, the ends of the oil inlet pipe 1 and the oil outlet pipe 2 are connected to the oil storage cylinder 9.

[0031] Preferably, the differential pressure switch 8 to be tested is connected to the detection system via a connector. This facilitates the disassembly and replacement of the differential pressure switch.

[0032] The differential pressure switch is tested by checking whether it sends an electrical signal when the pressure difference between the two inlet oil lines reaches 5 MPa. This requires collecting the output signal of the differential pressure switch and the actual pressure difference between the two oil lines. The pressure value can be obtained from the differential pressure sensor before the differential pressure switch inlet, as mentioned above, and verified by a mechanical pressure gauge. The synchronization between the pressure difference value on the pressure gauge and the time it reaches the differential pressure switch's output signal can determine if the pressure switch is functioning correctly. When the pressure switch malfunctions, several phenomena may occur: First, after the pressure of the first oil pressure transmitter 16 reaches 5 MPa, the differential pressure switch outputs no signal. Under the continuous oil delivery from the dry oil pump, the pressure difference of the first oil pressure transmitter 16 continues to increase until it reaches the overflow pressure of the safety valve. This indicates that the differential pressure switch valve core is stuck or the conductive contacts are not making proper contact. Second, a reversing signal is issued when the pressure difference of the first oil pressure transmitter 16 has not reached or has already exceeded 5 MPa. In this case, the opening damping force of the differential pressure switch is not properly adjusted, while the contact is normal.

[0033] The above embodiments are merely preferred technical solutions of this utility model and should not be considered as limitations on this utility model. The protection scope of this utility model should be the technical solution described in the claims, including equivalent substitutions of the technical features described in the claims. That is, equivalent substitutions and improvements within this scope are also within the protection scope of this utility model.

Claims

1. A differential pressure switch detection system for a dry oil lubrication system, characterized in that: It includes an oil inlet pipe (1) and an oil outlet pipe (2), and a dry oil pump (10) is installed on the oil outlet pipe (2). The oil inlet pipe (1) is connected to the oil inlet side of the reversing valve (3), and the oil inlet side of the reversing valve (3) is then connected to the second solenoid shut-off valve (5). The oil outlet pipe (2) is connected to the oil outlet side of the reversing valve (3), and the oil outlet side of the reversing valve (3) is then connected to the first solenoid shut-off valve (4). The first electromagnetic shut-off valve (4) is connected to one end of the first pressure regulating valve (6) and the differential pressure switch (8) to be measured. The second electromagnetic shut-off valve (5) is connected to the other end of the second pressure regulating valve (7) and the differential pressure switch (8) to be measured. The first pressure regulating valve (6) and the second pressure regulating valve (7) are then connected to the storage cylinder (9).

2. The differential pressure switch detection system for a dry oil lubrication system according to claim 1, characterized in that: After the first electromagnetic shut-off valve (4) and the second electromagnetic shut-off valve (5) are connected to the buffer pipeline (11), they are then connected to the differential pressure switch (8), the first pressure regulating valve (6) and the second pressure regulating valve (7).

3. The differential pressure switch detection system for a dry oil lubrication system according to claim 1 or 2, characterized in that: The first electromagnetic shut-off valve (4) and the second electromagnetic shut-off valve (5) are also connected to the first shut-off valve (12) and the second shut-off valve (13) respectively, and the first shut-off valve (12) and the second shut-off valve (13) are then connected to the storage cylinder (9).

4. The differential pressure switch detection system for a dry oil lubrication system according to claim 2, characterized in that: The first electromagnetic shut-off valve (4) and the second electromagnetic shut-off valve (5) are respectively connected to the buffer pipeline (11) by a third hydraulic transmitter (15) and a second hydraulic transmitter (14).

5. The differential pressure switch detection system for a dry oil lubrication system according to claim 1, characterized in that: A safety valve (17) is provided between the oil inlet pipe (1) and the oil outlet pipe (2).

6. The differential pressure switch detection system for a dry oil lubrication system according to claim 1, characterized in that: The first oil pressure transmitter (16) is connected to the oil outlet pipe (2).

7. The differential pressure switch detection system for a dry oil lubrication system according to claim 1, characterized in that: The ends of the oil inlet pipe (1) and the oil outlet pipe (2) are connected to the storage oil cylinder (9).

8. The differential pressure switch detection system for a dry oil lubrication system according to claim 1, characterized in that: The differential pressure switch (8) to be tested is connected to the detection system via a connector.

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