A double-acting hydraulic pile hammer striking energy measurement system

Abstract

The invention discloses a double-acting hydraulic pile hammer striking energy measurement system, which relates to the technical field of pile hammers. The system comprises: a controller, a hydraulic cylinder, a hydraulic reversing valve, an electromagnetic reversing valve, a pressure sensor, a first displacement sensor, a second displacement sensor and a hammer core; the hydraulic cylinder is connected to the hydraulic reversing valve, and the hydraulic reversing valve is connected to the electromagnetic reversing valve; the electromagnetic reversing valve, the pressure sensor, the first displacement sensor and the second displacement sensor are all connected to the controller; the pressure sensor is used to collect the pressure of the rodless cavity in the hydraulic cylinder, the first displacement sensor is used to collect the lifting displacement of the hammer core, and the second displacement sensor is used to collect the falling displacement of the hammer core; the controller is used to control the reversing of the hydraulic reversing valve through the electromagnetic reversing valve according to the lifting displacement and the falling displacement, and calculate the striking energy of the hammer core according to the pressure and the lifting displacement of the rodless cavity in the hydraulic cylinder. The invention improves the measurement accuracy of the striking energy and the pile driving efficiency at the same time.

Description

Technical Field

[0001] The invention relates to the technical field of pile hammers, in particular to a double-acting hydraulic pile hammer striking energy measurement system. Background Art

[0002] Double-acting hydraulic pile hammer is an indispensable key equipment for offshore wind power and other marine engineering construction, mainly used to drive wind power pile foundations into the seabed. As the offshore distance increases, in offshore wind power projects, the unit capacity of wind turbines, pile foundation diameter, and pile foundation depth will all increase simultaneously, posing new challenges to the improvement of offshore wind power equipment construction capabilities.

[0003] The core control device of the double-acting hydraulic pile hammer adopts hydraulic transmission. During the piling process, in addition to the free fall motion of the hammer core due to gravity, the hydraulic cylinder of the hydraulic transmission system also works on the hammer core, causing the hammer core to move downward with an acceleration greater than the free fall, thereby increasing the impact speed of the hammer core, that is, increasing the striking energy of the hammer core. Under the hammering force of the hammer core, the pile foundation overcomes the resistance of the soil around the pile foundation and penetrates into the soil, thereby achieving piling.

[0004] Striking energy is a very important technical indicator of a double-acting hydraulic pile hammer. According to the striking energy indicator, the striking energy transmission efficiency can be evaluated, the parameter matching of the hydraulic transmission system can be adjusted, the dynamic characteristics of the hydraulic transmission system can be optimized, etc., thereby improving the piling efficiency and extending the service life of the hydraulic pile hammer.

[0005] The striking energy of a hydraulic pile hammer is the kinetic energy of the speed of the hammer core striking the anvil. Since the falling striking of the hammer core is a dynamic process of the free fall of the hammer core and the acceleration of the falling striking by the hydraulic oil, it has the characteristics of fast dynamic response, large striking energy and fast striking speed. It is difficult for existing hydraulic pile hammer equipment to accurately measure the instantaneous speed of the hammer core striking the anvil, and thus it is difficult to accurately measure the striking energy of a hydraulic pile hammer. In addition, there are also methods to calculate the striking energy through mathematical modeling and theoretical analysis of hydraulic pile hammers, but due to the inaccurate parameters of the hydraulic pile hammer model or the neglect of some influencing factors in the modeling, this leads to a large error between the theoretically calculated striking energy and the actual energy. Summary of the invention

[0006] The purpose of the present invention is to provide a double-acting hydraulic pile hammer striking energy measurement system, which improves the measuring accuracy of striking energy and simultaneously improves the pile driving efficiency.

[0007] To achieve the above object, the present invention provides the following solutions:

[0008] A double-acting hydraulic pile hammer striking energy measurement system, comprising: a controller, a hydraulic cylinder, a hydraulic reversing valve, an electromagnetic reversing valve, a pressure sensor, a first displacement sensor, a second displacement sensor and a hammer core; the hammer core is connected to the piston rod of the hydraulic cylinder, the hydraulic cylinder is connected to the hydraulic reversing valve, and the hydraulic reversing valve is connected to the electromagnetic reversing valve; the electromagnetic reversing valve, the pressure sensor, the first displacement sensor and the second displacement sensor are all connected to the controller; the pressure sensor is used to collect the pressure of the rodless cavity in the hydraulic cylinder, the first displacement sensor is used to collect the lifting displacement of the hammer core, and the second displacement sensor is used to collect the falling displacement of the hammer core;

[0009] The controller is used to control the switching of the hydraulic reversing valve through the electromagnetic reversing valve according to the lifting displacement and the falling displacement, and calculate the striking energy of the hammer core according to the pressure of the rodless chamber in the hydraulic cylinder and the lifting displacement.

[0010] Optionally, it further comprises a hydraulic oil source and an oil tank, the electromagnetic reversing valve is a two-position four-way electromagnetic reversing valve, and the hydraulic reversing valve is a two-position three-way hydraulic reversing valve;

[0011] The P port of the hydraulic reversing valve is connected between the hydraulic oil source and the rod chamber of the hydraulic cylinder, the A port of the hydraulic reversing valve is connected to the rodless chamber of the hydraulic cylinder, and the T port of the hydraulic reversing valve is connected to the oil tank; the B port of the electromagnetic reversing valve is connected to the P port of the hydraulic reversing valve, the C port of the electromagnetic reversing valve is connected to the oil tank, the D port of the electromagnetic reversing valve is connected to the springless control chamber of the hydraulic reversing valve, and the E port of the electromagnetic reversing valve is connected to the spring control chamber of the hydraulic reversing valve.

[0012] Optionally, it further comprises a high-pressure accumulator and a low-pressure accumulator, wherein the high-pressure accumulator is connected to the hydraulic oil source, and the low-pressure accumulator is connected to the oil tank.

[0013] Optionally, the controller is used to control the switching of the hydraulic reversing valve through the electromagnetic reversing valve according to the lifting displacement and the falling displacement, specifically including:

[0014] The controller controls the electromagnetic reversing valve to be energized, starts the hydraulic oil source, and causes the piston rod of the hydraulic cylinder to drive the hammer core to lift upward;

[0015] When the piston rod of the hydraulic cylinder is lifted upward to reach the top position of the hydraulic cylinder, the controller controls the first displacement sensor to collect the lifting displacement, and controls the electromagnetic reversing valve to be powered off;

[0016] After the controller controls to cut off the power to the electromagnetic reversing valve, the piston of the rodless chamber of the hydraulic cylinder drives the hammer core to strike downward with an acceleration greater than the free fall under the action of high-pressure oil. During the downward striking movement, the controller obtains the first falling displacement of the second displacement sensor at the second sampling time and the second falling displacement of the second displacement sensor at the third sampling time, and calculates the reversing time when the piston rod of the hydraulic cylinder reaches the low position according to the first falling displacement, the second falling displacement and the striking height, and controls the power supply to the electromagnetic reversing valve according to the reversing time.

[0017] Optionally, the calculation formula for the reversing time when the piston rod reaches the low position is:

[0018] ;

[0019] ;

[0020] ;

[0021] Among them, t 23 represents the reversing time, t2 represents the time when the piston rod of the hydraulic cylinder reaches the low position, t3 represents the set hammer core holding time, h represents the striking height of the hammer core, s2 represents the first falling displacement, s3 represents the second falling displacement, v2 represents the falling speed of the hammer core, and T represents the difference between the third sampling time and the second sampling time.

[0022] Optionally, the controller is used to calculate the striking energy of the hammer core according to the pressure of the rodless chamber in the hydraulic cylinder and the lifting displacement, specifically including:

[0023] According to the formula Calculating the striking energy of the hammer core;

[0024] Wherein, E represents the striking energy, m represents the mass of the hammer core, g represents the acceleration of gravity, h represents the striking height of the hammer core, p1 represents the pressure of the rodless chamber in the hydraulic cylinder, A1 represents the piston area of ​​the hydraulic cylinder, and A2 represents the piston area of ​​the hydraulic cylinder minus the area of ​​the piston rod.

[0025] Optionally, a manual unloading valve is further included, wherein an inlet of the manual unloading valve is connected to the hydraulic oil source, and an outlet of the manual unloading valve is connected to the oil tank.

[0026] Optionally, a safety valve is further included, wherein the inlet of the safety valve is connected to the hydraulic oil source, and the outlet of the safety valve is connected to the oil tank.

[0027] According to the specific embodiments provided by the present invention, the present invention discloses the following technical effects:

[0028] The present invention controls the reversing of the hydraulic reversing valve through the electromagnetic reversing valve according to the lifting displacement and the falling displacement, thereby improving the timeliness of the reversing of the hydraulic cylinder piston rod movement, thereby improving the pile driving efficiency; the striking energy of the hammer core is calculated according to the pressure of the rodless chamber in the hydraulic cylinder and the lifting displacement, thereby improving the measurement accuracy of the striking energy. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0030] Figure 1 A schematic structural diagram of a double-acting hydraulic pile hammer striking energy measurement system provided in an embodiment of the present invention.

[0031] Explanation of symbols: 1-hydraulic oil source, 2-oil tank, 3-safety valve, 4-manual unloading valve, 5-high-pressure accumulator, 6-low-pressure accumulator, 7-electromagnetic reversing valve, 8-controller, 9-hydraulic reversing valve, 10-pressure sensor, 11-hydraulic cylinder, 12-hammer core, 13-first displacement sensor, 14-second displacement sensor, 15-anvil, 16-pile foundation. DETAILED DESCRIPTION

[0032] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0033] The purpose of the present invention is to provide a double-acting hydraulic pile hammer striking energy measurement system, which improves the measuring accuracy of striking energy and simultaneously improves the pile driving efficiency.

[0034] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0035] like Figure 1As shown, a double-acting hydraulic pile hammer striking energy measurement system provided by the present invention comprises: a controller 8, a hydraulic cylinder 11, a hydraulic reversing valve 9, an electromagnetic reversing valve 7, a pressure sensor 10, a first displacement sensor 13 (upper end displacement sensor), a second displacement sensor 14 (lower end displacement sensor) and a hammer core 12; the hammer core 12 is connected to the piston rod of the hydraulic cylinder 11, and the hammer core 12 falls to strike the anvil 15, the hydraulic cylinder 11 is connected to the hydraulic reversing valve 9, and the hydraulic reversing valve 9 is connected to the electromagnetic reversing valve 7; the electromagnetic reversing valve 7, the pressure sensor 10, the first displacement sensor 13 and the second displacement sensor 14 are all connected to the controller 8; the pressure sensor 10 is used to collect the pressure of the rodless chamber in the hydraulic cylinder 11, the first displacement sensor 13 is used to collect the lifting displacement of the hammer core 12, and the second displacement sensor 14 is used to collect the falling displacement of the hammer core 12.

[0036] The pressure sensor 10 specifically converts the pressure P into a voltage U and transmits it to the controller 8 , that is, the pressure sensor 10 uses voltage to represent the pressure signal.

[0037] A double-acting hydraulic pile hammer striking energy measurement system also includes a high-pressure accumulator 5 and a low-pressure accumulator 6, wherein the inlet of the high-pressure accumulator 5 is connected to the hydraulic oil source 1, and the inlet of the low-pressure accumulator 6 is connected to the oil tank 2. The high-pressure accumulator 5 can store and release hydraulic energy. The low-pressure accumulator 6 can absorb the pressure shock of the hydraulic oil return pipeline.

[0038] A double-acting hydraulic pile hammer striking energy measurement system further includes a manual unloading valve 4 and a safety valve 3, wherein the inlet of the manual unloading valve 4 is connected to the hydraulic oil source 1, and the outlet of the manual unloading valve 4 is connected to the oil tank 2. The manual unloading valve 4 can unload the hydraulic oil source 1.

[0039] The inlet of the safety valve 3 is connected to the hydraulic oil source 1, and the outlet of the safety valve 3 is connected to the oil tank 2. The safety valve 3 can provide safety protection for the working pressure of the hydraulic oil source 1.

[0040] The controller 8 collects the pressure signal of the pressure sensor 10, the controller 8 collects the signals of the upper displacement sensor and the lower displacement sensor, the controller 8 calculates the striking energy of the hammer core 12 striking the anvil 15, and the control signal output by the controller 8 is used to control the power on and off of the two-position four-way electromagnetic reversing valve 7. Specifically, the controller 8 is used to control the reversing of the hydraulic reversing valve 9 through the electromagnetic reversing valve 7 according to the lifting displacement and the falling displacement, and calculate the striking energy of the hammer core 12 according to the pressure of the rodless chamber in the hydraulic cylinder 11 and the lifting displacement.

[0041] The anvil 15 is located on the top of the pile foundation 16. The hammer core 12 falls and hits the anvil 15. The anvil 15 transmits the impact force to the pile foundation 16. The pile foundation 16 penetrates into the soil under the impact force, thereby achieving piling.

[0042] A double-acting hydraulic pile hammer striking energy measurement system also includes a hydraulic oil source 1 and an oil tank 2, the electromagnetic reversing valve 7 is a two-position four-way electromagnetic reversing valve 7, and the hydraulic reversing valve 9 is a two-position three-way hydraulic reversing valve 9.

[0043] The hydraulic oil source 1 is connected to the rod chamber of the hydraulic cylinder 11, the P port of the hydraulic reversing valve 9 is connected between the hydraulic oil source 1 and the rod chamber of the hydraulic cylinder 11, the A port of the hydraulic reversing valve 9 is connected to the rodless chamber of the hydraulic cylinder 11, and the T port of the hydraulic reversing valve 9 is connected to the oil tank 2. The hydraulic reversing valve 9 controls the hydraulic cylinder 11 to drive the hammer core 12 to perform falling striking and lifting movements.

[0044] The B port of the electromagnetic reversing valve 7 is connected to the P port of the hydraulic reversing valve 9, the C port of the electromagnetic reversing valve 7 is connected to the oil tank 2, the D port of the electromagnetic reversing valve 7 is connected to the springless control chamber of the hydraulic reversing valve 9, and the E port of the electromagnetic reversing valve 7 is connected to the spring control chamber of the hydraulic reversing valve 9. The electromagnetic reversing valve 7 performs reversing control on the hydraulic reversing valve 9.

[0045] In the aspect that the controller 8 is used to control the reversing of the hydraulic reversing valve 9 through the electromagnetic reversing valve 7 according to the lifting displacement and the falling displacement, and calculate the striking energy of the hammer core 12 according to the pressure of the rodless chamber in the hydraulic cylinder 11 and the lifting displacement, it specifically includes: (1) the controller 8 controls the electromagnetic reversing valve 7 to be energized, starts the hydraulic oil source 1, and makes the piston rod of the hydraulic cylinder 11 drive the hammer core 12 to lift upward. (2) when the piston rod of the hydraulic cylinder 11 is lifted upward to the top position of the hydraulic cylinder 11, the controller 8 records the first sampling time T1, controls the first displacement sensor 13 to collect the lifting displacement, that is, the striking height h, and controls the electromagnetic reversing valve 7 to be powered off.

[0046] The controller 8 controls the electromagnetic reversing valve 7 to be energized, starts the hydraulic oil source 1, and causes the piston rod of the hydraulic cylinder 11 to drive the hammer core 12 to lift upward. Specifically, it includes:

[0047] The controller 8 outputs a control voltage signal to the electromagnet of the two-position four-way electromagnetic reversing valve 7, the electromagnet of the two-position four-way electromagnetic reversing valve 7 is energized, and the two-position four-way electromagnetic reversing valve 7 works in the left position.

[0048] Start the hydraulic oil source 1, and the high-pressure oil of the hydraulic oil source 1 is supplied to the spring control chamber of the two-position three-way hydraulic reversing valve 9 through the B port and E port of the two-position four-way electromagnetic reversing valve 7. The oil in the springless control chamber of the two-position three-way hydraulic reversing valve 9 flows to the oil tank 2 through the D port and C port of the two-position four-way electromagnetic reversing valve 7, so that the two-position three-way hydraulic reversing valve 9 works in the upper position.

[0049] The hydraulic oil source 1 supplies oil to the rod chamber of the hydraulic cylinder 11 and the inlet of the high-pressure accumulator 5. The oil in the rodless chamber of the hydraulic cylinder 11 flows to the oil tank 2 through the A port and the T port of the two-position three-way hydraulic reversing valve 9. The piston rod of the hydraulic cylinder 11 drives the hammer core 12 to lift upward, and the high-pressure accumulator 5 is filled with liquid to store energy.

[0050] When the piston rod of the hydraulic cylinder 11 is lifted upward to the top position of the hydraulic cylinder 11, the controller 8 records the first sampling time T1, controls the first displacement sensor 13 to collect the lifting displacement, that is, the striking height h, and controls the electromagnetic reversing valve 7 to be powered off. Specifically, it includes:

[0051] When the piston rod of the hydraulic cylinder 11 moves upward and reaches the top position of the hydraulic cylinder 11, at sampling time T1, the controller 8 reads the signal s1 of the displacement sensor 13.

[0052] According to the signal s1 of the displacement sensor 13, the controller 8 outputs a zero voltage signal to the electromagnet of the two-position four-way electromagnetic reversing valve 7, and the electromagnet of the two-position four-way electromagnetic reversing valve 7 is powered off, so that the two-position four-way electromagnetic reversing valve 7 is switched to the right position.

[0053] The high-pressure oil from the hydraulic oil source 1 is supplied to the springless control chamber of the two-position three-way hydraulic reversing valve 9 through the B port and the D port of the two-position four-way electromagnetic reversing valve 7. The oil in the spring control chamber of the two-position three-way hydraulic reversing valve 9 flows to the oil tank 2 through the E port and the C port of the two-position four-way electromagnetic reversing valve 7, so that the two-position three-way hydraulic reversing valve 9 works in the lower position.

[0054] The high-pressure oil of the hydraulic oil source 1, the high-pressure oil of the high-pressure accumulator 5, and the oil discharged from the rod chamber of the hydraulic cylinder 11 are connected to the rodless chamber of the hydraulic cylinder 11 through the P port and A port of the two-position three-way hydraulic reversing valve 9, and the signal p1 of the pressure sensor 10 is read through the controller 8.

[0055] According to the principle of energy conservation, the kinetic energy E of the hammer core 12 striking the anvil 15 is equal to the sum of the potential energy of the hammer core 12 at the starting striking height and the pressure energy applied by the hydraulic cylinder 11. The signal p1 of the pressure sensor 10 and the signal s1 of the displacement sensor 13 are calculated in the controller 8 as follows to obtain the striking energy E of the hammer core 12.

[0056] .

[0057] Wherein m is the mass of the hammer core 12, h is the striking height of the hammer core 12, p1 is the pressure of the rodless chamber and the rod chamber of the hydraulic cylinder 11, A1 is the piston area of ​​the hydraulic cylinder 11, and A2 is the piston area of ​​the hydraulic cylinder 11 minus the area of ​​the piston rod.

[0058] After the controller 8 controls the electromagnetic reversing valve 7 to be powered off, the piston of the rodless chamber of the hydraulic cylinder 11 drives the hammer core 12 to strike downward with an acceleration greater than the free fall under the action of high-pressure oil. During the downward striking movement, the controller 8 obtains the first falling displacement of the second displacement sensor 14 at the second sampling time and the second falling displacement of the second displacement sensor 14 at the third sampling time, and calculates the reversing time when the piston rod of the hydraulic cylinder 11 reaches the low position according to the first falling displacement, the second falling displacement and the striking height, and controls the electromagnetic reversing valve 7 to be powered on according to the reversing time, so that the two-position four-way electromagnetic reversing valve 7 is switched to work in the left position.

[0059] The calculation formula for the reversing time when the piston rod reaches the low position is:

[0060] .

[0061] .

[0062] .

[0063] Among them, t 23 represents the reversing time, t2 represents the time when the piston rod of the hydraulic cylinder reaches the low position (lowest end), t3 represents the set hammer core holding time, h represents the striking height of the hammer core, s2 represents the first falling displacement, s3 represents the second falling displacement, v2 represents the falling speed of the hammer core, and T represents the difference between the third sampling time and the second sampling time.

[0064] By continuing to repeat the above steps, the reciprocating motion of the hammer core 11 lifting and falling to strike can be achieved.

[0065] The present invention can accurately evaluate the striking energy transmission efficiency according to the measured striking energy of the hammer core striking the anvil, provide guidance for the matching and adjustment of the hydraulic transmission system parameters, optimize the dynamic characteristics of the hydraulic transmission system, etc., thereby improving the pile driving efficiency and extending the service life of the hydraulic pile hammer.

[0066] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0067] The principles and implementation methods of the present invention are described in this article using specific examples. The description of the above embodiments is only used to help understand the method and core idea of ​​the present invention. At the same time, for those skilled in the art, according to the idea of ​​the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A double-acting hydraulic pile hammer striking energy measurement system, characterized in that: include: A controller, a hydraulic cylinder, a hydraulic reversing valve, an electromagnetic reversing valve, a pressure sensor, a first displacement sensor, a second displacement sensor and a hammer core; the hammer core is connected to the piston rod of the hydraulic cylinder, the hydraulic cylinder is connected to the hydraulic reversing valve, and the hydraulic reversing valve is connected to the electromagnetic reversing valve; the electromagnetic reversing valve, the pressure sensor, the first displacement sensor and the second displacement sensor are all connected to the controller; the pressure sensor is used to collect the pressure of the rodless cavity in the hydraulic cylinder, the first displacement sensor is used to collect the lifting displacement of the hammer core, and the second displacement sensor is used to collect the falling displacement of the hammer core; The controller is used to control the reversing of the hydraulic reversing valve through the electromagnetic reversing valve according to the lifting displacement and the falling displacement, and calculate the striking energy of the hammer core according to the pressure of the rodless chamber in the hydraulic cylinder and the lifting displacement; The double-acting hydraulic pile hammer striking energy measurement system further includes a hydraulic oil source and an oil tank, the electromagnetic reversing valve is a two-position four-way electromagnetic reversing valve, and the hydraulic reversing valve is a two-position three-way hydraulic reversing valve; The P port of the hydraulic reversing valve is connected between the hydraulic oil source and the rod chamber of the hydraulic cylinder, the A port of the hydraulic reversing valve is connected to the rodless chamber of the hydraulic cylinder, and the T port of the hydraulic reversing valve is connected to the oil tank; the B port of the electromagnetic reversing valve is connected to the P port of the hydraulic reversing valve, the C port of the electromagnetic reversing valve is connected to the oil tank, the D port of the electromagnetic reversing valve is connected to the springless control chamber of the hydraulic reversing valve, and the E port of the electromagnetic reversing valve is connected to the spring control chamber of the hydraulic reversing valve; In the aspect that the controller is used to control the switching of the hydraulic reversing valve through the electromagnetic reversing valve according to the lifting displacement and the falling displacement, it specifically includes: The controller controls the electromagnetic reversing valve to be energized, starts the hydraulic oil source, and causes the piston rod of the hydraulic cylinder to drive the hammer core to lift upward; When the piston rod of the hydraulic cylinder is lifted upward to reach the top position of the hydraulic cylinder, the controller controls the first displacement sensor to collect the lifting displacement, and controls the electromagnetic reversing valve to be powered off; After the controller controls to cut off the power to the electromagnetic reversing valve, the piston of the rodless chamber of the hydraulic cylinder drives the hammer core to strike downward with an acceleration greater than the free fall under the action of high-pressure oil. During the downward striking movement, the controller obtains the first falling displacement of the second displacement sensor at the second sampling time and the second falling displacement of the second displacement sensor at the third sampling time, and calculates the reversing time when the piston rod of the hydraulic cylinder reaches the low position according to the first falling displacement, the second falling displacement and the striking height, and controls the power supply to the electromagnetic reversing valve according to the reversing time.

2. The double-acting hydraulic pile hammer striking energy measurement system according to claim 1, characterized in that: It also includes a high-pressure accumulator and a low-pressure accumulator, wherein the high-pressure accumulator is connected to the hydraulic oil source, and the low-pressure accumulator is connected to the oil tank.

3. The double-acting hydraulic pile hammer striking energy measurement system according to claim 1, characterized in that: The calculation formula for the reversing time when the piston rod reaches the low position is: ； ； ； in, t 23 represents the commutation time, t 2 represents the time when the piston rod of the hydraulic cylinder reaches the low position, t 3 indicates the set hammer core pressure holding time. h Indicates the striking height of the hammer core, s 2 represents the first drop displacement, s 3 represents the second drop displacement, v 2 represents the falling speed of the hammer core, T Represents the difference between the third sampling time and the second sampling time.

4. The double-acting hydraulic pile hammer striking energy measurement system according to claim 1, characterized in that: In terms of the controller being used to calculate the striking energy of the hammer core according to the pressure of the rodless chamber in the hydraulic cylinder and the lifting displacement, it specifically includes: According to the formula Calculating the striking energy of the hammer core; in, E represents the striking energy, m represents the mass of the hammer core, g represents the acceleration due to gravity, h Indicates the striking height of the hammer core, p 1 represents the pressure of the rodless chamber in the hydraulic cylinder, A 1 represents the piston area of ​​the hydraulic cylinder, A 2 represents the piston area of ​​the hydraulic cylinder minus the area of ​​the piston rod.

5. The double-acting hydraulic pile hammer striking energy measurement system according to claim 1, characterized in that: It also includes a manual unloading valve, the inlet of which is connected to the hydraulic oil source, and the outlet of which is connected to the oil tank.

6. The double-acting hydraulic pile hammer striking energy measurement system according to claim 1, characterized in that: It also includes a safety valve, the inlet of which is connected to the hydraulic oil source, and the outlet of which is connected to the oil tank.

Images