An air-operated system for a hydraulic pile hammer and its working method

Abstract

The present invention introduces a pneumatic system for a hydraulic pile hammer and its working method. A first ball valve is arranged on the pipeline between the air compressor and the gas cylinder assembly, a safety valve is arranged on the pipeline between the first ball valve and the gas cylinder assembly, and the gas cylinder assembly outlet is connected to the sewage collection tank through the pipeline via the second ball valve; the gas filter outlet is connected to the upper cylinder of the hammer body through the pipeline and the third ball valve, fourth ball valve, and fifth ball valve arranged in sequence on the pipeline; the sixth ball valve, the first-stage pressure reducing valve, the first check valve, and the seventh ball valve are arranged in sequence on the first pipeline; the second pressure transmitter is arranged between the third ball valve and the fourth ball valve; the ninth ball valve, the solenoid valve, and the tenth ball valve are arranged in sequence on the second pipeline; and the third pressure transmitter is arranged between the end of the second pipeline and the fifth ball valve. The system of the present invention is equipped with preventive protection measures such as high-pressure interlocking and automatic exhaust of overpressure to ensure system safety; it can serve as a gas source for multiple gas-using locations, realizing multiple uses of one system.

Description

Technical Field

[0001] The present invention relates to the technical field of hydraulic pile hammers, and in particular to a pneumatic system for a hydraulic pile hammer and a working method thereof. Background Art

[0002] There are currently two main hydraulic drive structures for offshore hydraulic pile hammers. One is liquid-gas drive, in which the hydraulic system only controls one oil chamber, with oil inlet lifting and oil outlet dropping. There is compressed air with a certain pressure in the upper chamber, and the hammer core strikes under the action of compressed air and its own weight; the other is liquid-liquid drive, in which the oil cylinder is divided into upper and lower chambers in the hydraulic system. The upper and lower chambers are connected to form a differential circuit, and the hammer core quickly descends under the action of oil pressure and its own weight to strike.

[0003] In the above-mentioned liquid-gas drive structure, if the pile driving work is carried out solely by the deadweight of the hammer core, the relatively low striking energy and the large overshoot distance when the hammer core is lifted make it impossible to accurately control the striking energy. Filling the upper chamber with air at a certain pressure can greatly increase the striking energy. In addition, it can also effectively increase the overshoot resistance of the hammer core and reduce the overshoot distance of the hammer core. Therefore, a safe, reliable, and stable air compression system and working method are crucial. Summary of the Invention

[0004] The purpose of the present invention is to overcome the shortcomings of the prior art and provide a pneumatic system for a hydraulic pile hammer and a working method thereof, which can safely and reliably provide compressed air to the hammer core for striking, increase the striking energy of the hammer core, and have a wide range of system functions.

[0005] The technical solution adopted in the present invention is:

[0006] A pneumatic system for a hydraulic pile hammer, comprising an air compressor, a first ball valve, a gas cylinder assembly, a second ball valve, a safety valve, an air filter, a first pressure transmitter, a pressure switch, a third ball valve, a fourth ball valve, a fifth ball valve, a second pressure transmitter, a sixth ball valve, a first pressure reducing valve, a first check valve, a seventh ball valve, an eighth ball valve, a second pressure reducing valve, a second check valve, a ninth ball valve, a solenoid valve, a tenth ball valve, and a third pressure transmitter;

[0007] The air compressor outlet is connected to the gas filling port of the gas cylinder assembly through a pipeline, the first ball valve is arranged on the pipeline between the air compressor and the gas cylinder assembly, the safety valve is arranged on the pipeline between the first ball valve and the gas cylinder assembly, and the gas cylinder assembly outlet is connected to the sewage collecting tank through the pipeline via the second ball valve; the air compressor outlet is also connected to the air filter inlet through a pipeline; the first pressure transmitter and the pressure switch are arranged in sequence on the pipeline between the air compressor outlet and the air filter inlet; the air filter outlet is connected to the upper cylinder of the hammer through a pipeline and the third ball valve, the fourth ball valve, and the fifth ball valve arranged in sequence on the pipeline; the second pressure transmitter is arranged on the third ball valve. valve and the fourth ball valve; a first pipeline is arranged in parallel between the inlet and outlet ends of the third ball valve; the sixth ball valve, the first-level pressure reducing valve, the first one-way valve and the seventh ball valve are arranged in sequence on the first pipeline; the outlet end of the seventh ball valve is also connected to the hydraulic system return oil supply port and the tool air supply port through pipelines respectively; the eighth ball valve, the second-level pressure reducing valve and the second one-way valve are arranged in sequence on the pipeline between the outlet end of the seventh ball valve and the tool air supply port; a second pipeline is arranged in parallel at both ends of the fourth ball valve; the ninth ball valve, the solenoid valve and the tenth ball valve are arranged in sequence on the second pipeline; the third pressure transmitter is arranged between the end of the second pipeline and the fifth ball valve.

[0008] Specifically, two air compressors are connected in parallel, with one in use and one as a backup.

[0009] Specifically, the air filter outlet is further connected to the system pressure relief port through a pipeline, and an eleventh ball valve is provided on the pipeline between the air filter outlet and the pressure relief port.

[0010] Specifically, bypass pipelines are arranged in parallel at both ends of the fourth ball valve, and the twelfth ball valve and the thirteenth ball valve are arranged on the bypass pipeline. The pipeline between the twelfth ball valve and the thirteenth ball valve is connected to the sewage collecting tank; the twelfth ball valve and the thirteenth ball valve are used for pressure relief and sewage discharge of the first pipeline and the second pipeline.

[0011] Specifically, the first pressure transmitter, the pressure switch, the second pressure transmitter, the solenoid valve and the third pressure transmitter are all electrically connected to the control system of the pneumatic system.

[0012] Specifically, a pressure gauge is also provided on the outlet end of the second pipeline.

[0013] A working method of a pneumatic system for a hydraulic pile hammer, specifically:

[0014] S1: First, ensure that the second to thirteenth ball valves in the system are all closed, open the first ball valve, and then start one of the air compressors to inflate the gas cylinder assembly. The pressure in the gas cylinder assembly continues to increase until it reaches the system set pressure. The air compressor stops running and the system inflation is completed.

[0015] S2: When the hydraulic pile hammer is working: the sixth ball valve, the seventh ball valve, the fourth ball valve and the fifth ball valve are opened in sequence, and the high-pressure air in the system passes through the first-stage pressure reducing valve and the first non-return valve to the upper part of the hammer core in the upper cylinder of the hydraulic pile hammer, providing energy for the hammer core to fall and strike; or the sixth ball valve, the seventh ball valve, the ninth ball valve, the tenth ball valve and the fifth ball valve are opened in sequence, and the opening and closing of the solenoid valve are remotely controlled manually or automatically to realize the opening and closing of the upper pipeline route leading to the hammer core in the upper cylinder of the hydraulic pile hammer;

[0016] S3: When maintaining and overhauling the pile hammer: open the sixth and seventh ball valves in sequence. The high-pressure air in the system passes through the first-stage pressure reducing valve and the first non-return valve to the oil return line of the hydraulic system of the hydraulic pile hammer. The valve installed on the oil return line controls the flow of high-pressure air into the oil return line, and blows the oil in the hydraulic system back to the oil tank, ensuring that the site environment is clean when the hydraulic pile hammer is disassembled.

[0017] S4: When providing power to pneumatic tools: open the sixth, seventh, and eighth ball valves in sequence, and the high-pressure air in the system passes through the first-stage pressure reducing valve, the first check valve, the second-stage pressure reducing valve, and the second check valve to provide power to various pneumatic tools;

[0018] S5: When used for system unloading: open the eleventh ball valve, and the high-pressure air in the system is released to the atmosphere;

[0019] S6: When there is liquefied water at the bottom of the gas cylinder of the gas cylinder assembly, open the second valve to drain the water into the sewage collecting tank; the water in each pipeline is discharged into the sewage collecting tank through the pipeline between the twelfth ball valve and the thirteenth ball valve.

[0020] Due to the adoption of the above technical solution, the present invention has the following advantages:

[0021] The air compressor of the present invention is used in one and is reserved in the other, which can improve the reliability of the system and enhance the risk resistance of the system; the system is provided with preventive protection measures such as high-pressure interlocking and automatic exhaust of overpressure to ensure the safety of the system; when supplying air to the upper cylinder of the hydraulic pile hammer, the air can be turned on and off manually, or the air supply on and off values can be set according to the required pressure in the upper cylinder, and the system automatically turns on and off the air by controlling the solenoid valve; a gas cylinder assembly is provided in the system for energy storage, reducing the frequent start and stop times of the air compressor caused by insufficient gas pressure in the upper cylinder; it can be used as a gas source for a variety of gas-using places, realizing multiple uses of one system. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the overall connection of the present invention.

[0023] In the figure: 1-air compressor, 2-first ball valve, 3-gas cylinder assembly, 4-second ball valve, 5-safety valve, 6-air filter, 7-first pressure transmitter, 8-pressure switch, 9-third ball valve, 10-fourth ball valve, 11-fifth ball valve, 12-second pressure transmitter, 13-sixth ball valve, 14-first pressure reducing valve, 15-first check valve, 16-seventh ball valve, 17-eighth ball valve, 18-second pressure reducing valve, 19-second check valve, 20-ninth ball valve, 21-solenoid valve, 22-tenth ball valve, 23-eleventh ball valve, 24-twelfth ball valve, 25-third pressure transmitter, 26-thirteenth ball valve, 27-pressure gauge. DETAILED DESCRIPTION

[0024] The present invention will be further explained below with reference to the accompanying drawings and embodiments, which should not be used to limit the scope of protection of the present invention. The purpose of disclosing the present invention is to protect all technical improvements within the scope of the present invention.

[0025] Combined with attachment Figure 1 The pneumatic system shown is for a hydraulic pile hammer, comprising an air compressor 1, a first ball valve 2, a gas cylinder assembly 3, a second ball valve 4, a safety valve 5, an air filter 6, a first pressure transmitter 7, a pressure switch 8, a third ball valve 9, a fourth ball valve 10, a fifth ball valve 11, a second pressure transmitter 12, a sixth ball valve 13, a first pressure reducing valve 14, a first check valve 15, a seventh ball valve 16, an eighth ball valve 17, a second pressure reducing valve 18, a second check valve 19, a ninth ball valve 20, a solenoid valve 21, a tenth ball valve 22, and a third pressure transmitter 26.

[0026] The air outlet of the air compressor 1 is connected to the charging port of the gas cylinder assembly 3 through a pipeline. Two air compressors 1 are set in parallel, one for use and one for backup; the first ball valve 2 is arranged on the pipeline between the air compressor 1 and the gas cylinder assembly 3, and the safety valve 5 is arranged on the pipeline between the first ball valve 2 and the gas cylinder assembly 3. The air outlet of the gas cylinder assembly 3 is connected to the sewage collecting tank through the second ball valve 4 through the pipeline; the air outlet of the air compressor 1 is also connected to the inlet of the air filter 6 through a pipeline; the first pressure transmitter 7 and the pressure switch 8 are arranged in sequence on the pipeline between the air outlet of the air compressor 1 and the inlet of the air filter 6; the outlet of the air filter 6 is connected to the upper cylinder of the hammer through a pipeline and the third ball valve 9, the fourth ball valve 10, and the fifth ball valve 11 arranged in sequence on the pipeline. The outlet of the air filter 6 is also connected to the system pressure relief port through a pipeline. An eleventh ball valve 23 is provided on the pipeline between the outlet of the air filter 6 and the system pressure relief port; the second pressure transmitter 12 is arranged between the third ball valve 9 and the fourth ball valve 10.

[0027] A first pipeline is provided in parallel between the inlet and outlet ends of the third ball valve 9; a sixth ball valve 13, a first-stage pressure-reducing valve 14, a first check valve 15, and a seventh ball valve 16 are provided in sequence on the first pipeline; the outlet end of the seventh ball valve 16 is also connected to the hydraulic system return oil supply port and the tool air supply port via pipelines, respectively; an eighth ball valve 17, a second-stage pressure-reducing valve 18, and a second check valve 19 are provided in sequence on the pipeline between the outlet end of the seventh ball valve 16 and the tool air supply port; a second pipeline and a bypass pipeline are provided in parallel at both ends of the fourth ball valve 10; a ninth ball valve 20, a solenoid valve 21, and a tenth ball valve 22 are provided in sequence on the second pipeline; a twelfth ball valve 24 and a thirteenth ball valve 25 are provided on the bypass pipeline, and the pipeline between the twelfth and thirteenth ball valves 24 and 25 is connected to a sewage collecting tank; the twelfth and thirteenth ball valves 24 and 25 are used to relieve pressure and drain sewage from the first and second pipelines; a third pressure transmitter 26 is provided between the end of the second pipeline and the fifth ball valve 11.

[0028] Preferably, the first pressure transmitter 7, the pressure switch 8, the second pressure transmitter 12, the solenoid valve 21 and the third pressure transmitter 26 are all electrically connected to the control system of the pneumatic system.

[0029] Preferably, a pressure gauge 27 is further provided on the outlet end of the second pipeline.

[0030] A working method of a pneumatic system for a hydraulic pile hammer, specifically:

[0031] S1: First, ensure that the second ball valve 4 to the thirteenth ball valve 25 in the system are all closed, open the first ball valve 2, and then start one of the air compressors 1 to inflate the gas cylinder assembly 3. The pressure in the gas cylinder assembly 3 continues to increase until the air compressor 1 stops running when the system set pressure is reached, and the system inflation is completed;

[0032] S2: When the hydraulic pile hammer is working: the sixth ball valve 13, the seventh ball valve 16, the fourth ball valve 10 and the fifth ball valve 11 are opened in sequence, and the high-pressure air in the system passes through the first-stage pressure reducing valve 14 and the first non-return valve 15 to the upper part of the hammer core in the upper cylinder of the hydraulic pile hammer, providing energy for the hammer core to fall and strike; or the sixth ball valve 13, the seventh ball valve 16, the ninth ball valve 20, the tenth ball valve 22 and the fifth ball valve 11 are opened in sequence, and the solenoid valve 21 is remotely manually or automatically controlled to be on and off, so as to realize the connection and disconnection of the upper pipeline route to the hammer core in the upper cylinder of the hydraulic pile hammer;

[0033] S3: During maintenance and overhaul of the pile hammer: open the sixth ball valve 13 and the seventh ball valve 16 in sequence. The high-pressure air in the system passes through the first-stage pressure reducing valve 14 and the first non-return valve 15 to the oil return line of the hydraulic system of the hydraulic pile hammer. The valve provided on the oil return line controls the flow of high-pressure air into the oil return line, and blows the oil in the hydraulic system back to the oil tank, ensuring a clean site environment when the hydraulic pile hammer is disassembled.

[0034] S4: When providing power to other pneumatic tools: open the sixth ball valve 13, the seventh ball valve 16, and the eighth ball valve 17 in sequence. The high-pressure air in the system passes through the first pressure reducing valve 14, the first check valve 15, the second pressure reducing valve 18, and the second check valve 19 to provide power to various pneumatic tools.

[0035] S5: When used for system unloading: open the eleventh ball valve 23, and the high-pressure air in the system is released to the atmosphere;

[0036] S6: When there is liquefied water at the bottom of the gas cylinder of the gas cylinder assembly 3, open the second valve to drain the water into the sewage collecting tank; the water in each pipeline is discharged into the sewage collecting tank through the pipeline between the twelfth ball valve 24 and the thirteenth ball valve 25.

[0037] The first pressure transmitter 7, pressure switch 8, and solenoid valve 21 of the present invention are interlocked with the control system of the pneumatic system. The second pressure transmitter 12 and the third pressure transmitter 26 respectively send the pressure value signal of the pipeline after the first-stage pressure reducing valve 14 and the pressure value signal of the upper high-pressure air entering the hammer core in the upper cylinder of the pile hammer to the control system for remote monitoring; the gas cylinder assembly 3 is composed of multiple gas cylinders connected in parallel, which plays the role of energy storage. The appropriate number of gas cylinders is selected according to the energy required by the system to provide stable pressurized air to the outside; when the air compressor 1 is started, the gas cylinder assembly 3 is first inflated. After the control system monitors that the value of the first pressure transmitter 7 reaches the set value, that is, when the system pressure rises to the rated set value, the air compressor 1 automatically stops running. At this time, the pressure in the gas cylinder assembly 3 is much higher than the operating pressure, and because the gas cylinder assembly 3 has a large capacity, Therefore, when the pneumatic system is in use, if the required amount of gas is small, the pneumatic system air compressor 1 will not run, and only the energy stored in the gas cylinder assembly 3 will be used; if the required amount of gas is large, when the pressure in the gas cylinder assembly 3 drops to the set value, the air compressor 1 will automatically start to replenish gas into the system; the pressure of the energy pre-stored in the gas cylinder assembly 3 is stable, and after the pneumatic system outlet pressure is set, air with stable pressure can be provided to the outside; when the system pressure exceeds the rated set value, that is, the alarm value range, the control system will automatically alarm, but the air compressor 1 will not stop running; when the system pressure exceeds the alarm value range, that is, reaches the shutdown value, the control system will automatically alarm, and the air compressor 1 will stop running.

[0038] Controlling the opening and closing of the outlet gas source of the first-stage pressure reducing valve 14 can realize remote control, manual control or automatic control; through the first-stage pressure reducing valve 14 and the second-stage pressure reducing valve 18, the stored air pressure in the gas cylinder assembly 3 is much higher than the use pressure, and the high-pressure air is reduced in pressure by the pressure reducing valve, so that the output air can reach the actual required pressure; a mechanical safety valve 5 is configured, and when other automatic control and monitoring systems have problems, the safety valve 5 serves as the last line of defense to prevent overpressure.

[0039] The parts not described in detail in this invention are prior art.

[0040] The embodiments selected herein for the purpose of disclosing the invention are presently considered suitable, but it should be understood that the invention is intended to include all variations and modifications of the embodiments that fall within the scope of the concept and invention.

Claims

1. A pneumatic system for a hydraulic pile hammer, characterized in that: It includes an air compressor, a first ball valve, a gas cylinder assembly, a second ball valve, a safety valve, an air filter, a first pressure transmitter, a pressure switch, a third ball valve, a fourth ball valve, a fifth ball valve, a second pressure transmitter, a sixth ball valve, a first pressure reducing valve, a first check valve, a seventh ball valve, an eighth ball valve, a second pressure reducing valve, a second check valve, a ninth ball valve, a solenoid valve, a tenth ball valve and a third pressure transmitter; The air compressor outlet is connected to the gas filling port of the gas cylinder assembly through a pipeline, the first ball valve is arranged on the pipeline between the air compressor and the gas cylinder assembly, the safety valve is arranged on the pipeline between the first ball valve and the gas cylinder assembly, and the gas cylinder assembly outlet is connected to the sewage collecting tank through the pipeline via the second ball valve; the air compressor outlet is also connected to the air filter inlet through a pipeline; the first pressure transmitter and the pressure switch are arranged in sequence on the pipeline between the air compressor outlet and the air filter inlet; the air filter outlet is connected to the upper cylinder of the hammer through a pipeline and the third ball valve, the fourth ball valve, and the fifth ball valve arranged in sequence on the pipeline, the air filter outlet is also connected to the system pressure relief port through a pipeline, and an eleventh ball valve is arranged on the pipeline between the air filter outlet and the pressure relief port; the second pressure transmitter is arranged between the third ball valve and the fourth ball valve; the inlet and outlet of the third ball valve A first pipeline is arranged in parallel between the two ends; the sixth ball valve, the first-level pressure reducing valve, the first one-way valve and the seventh ball valve are arranged in sequence on the first pipeline; the outlet end of the seventh ball valve is also connected to the hydraulic system return oil supply port and the tool air supply port through pipelines respectively; the eighth ball valve, the second-level pressure reducing valve and the second one-way valve are arranged in sequence on the pipeline between the outlet end of the seventh ball valve and the tool air supply port; a second pipeline and a bypass pipeline are arranged in parallel at both ends of the fourth ball valve; the ninth ball valve, the solenoid valve and the tenth ball valve are arranged in sequence on the second pipeline; the twelfth ball valve and the thirteenth ball valve are arranged on the bypass pipeline, and the pipeline between the twelfth ball valve and the thirteenth ball valve is connected to the sewage collecting tank; the twelfth ball valve and the thirteenth ball valve are used for pressure relief and sewage discharge of the first pipeline and the second pipeline; the third pressure transmitter is arranged between the end of the second pipeline and the fifth ball valve.

2. The pneumatic system for a hydraulic pile hammer according to claim 1, characterized in that: The air compressors are arranged in parallel in two, with one in use and one as a backup.

3. The pneumatic system for a hydraulic pile hammer according to claim 1, characterized in that: The first pressure transmitter, the pressure switch, the second pressure transmitter, the solenoid valve and the third pressure transmitter are all electrically connected to the control system of the pneumatic system.

4. The pneumatic system for a hydraulic pile hammer according to claim 1, characterized in that: A pressure gauge is also provided on the outlet end of the second pipeline.

5. A method for operating a pneumatic system for a hydraulic pile hammer according to any one of claims 1 to 4, characterized in that: include: S1: First, ensure that the second to thirteenth ball valves in the system are all closed, open the first ball valve, and then start one of the air compressors to inflate the gas cylinder assembly. The pressure in the gas cylinder assembly continues to increase until it reaches the system set pressure. The air compressor stops running and the system inflation is completed. S2: When the hydraulic pile hammer is working: the sixth ball valve, the seventh ball valve, the fourth ball valve and the fifth ball valve are opened in sequence, and the high-pressure air in the system passes through the first-stage pressure reducing valve and the first non-return valve to the upper part of the hammer core in the upper cylinder of the hydraulic pile hammer, providing energy for the hammer core to fall and strike; or the sixth ball valve, the seventh ball valve, the ninth ball valve, the tenth ball valve and the fifth ball valve are opened in sequence, and the opening and closing of the solenoid valve are remotely controlled manually or automatically to realize the opening and closing of the upper pipeline route leading to the hammer core in the upper cylinder of the hydraulic pile hammer; S3: When maintaining and overhauling the pile hammer: open the sixth and seventh ball valves in sequence. The high-pressure air in the system passes through the first-stage pressure reducing valve and the first non-return valve to the oil return line of the hydraulic system of the hydraulic pile hammer. The valve installed on the oil return line controls the flow of high-pressure air into the oil return line, and blows the oil in the hydraulic system back to the oil tank, ensuring that the site environment is clean when the hydraulic pile hammer is disassembled. S4: When providing power to pneumatic tools: open the sixth, seventh, and eighth ball valves in sequence, and the high-pressure air in the system passes through the first-stage pressure reducing valve, the first check valve, the second-stage pressure reducing valve, and the second check valve to provide power to various pneumatic tools; S5: When used for system unloading: open the eleventh ball valve, and the high-pressure air in the system is released to the atmosphere; S6: When there is liquefied water at the bottom of the gas cylinder of the gas cylinder assembly, open the second valve to drain the water into the sewage collecting tank; the water in each pipeline is discharged into the sewage collecting tank through the pipeline between the twelfth ball valve and the thirteenth ball valve.

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