A kind of control electromechanical hydraulic system and method of compactor hoist lifting and empty hook lowering

Abstract

The application discloses a kind of control electromechanical hydraulic system and method of strong rammer winch lifting and empty hook down, including parallelly connected lifting assembly and down component, further including control outer embrace work oil circuit, pressure switch P is equipped on the work oil circuit.By relay, the problem that long time press button is needed in lifting process is solved, and the outer embrace brake of normally closed type is used, by installing pressure switch on the work oil circuit of control outer embrace, the problem of low safety of misoperation is solved.

Description

Technical Field

[0001] This invention relates to the field of engineering machinery technology, and in particular to an electromechanical-hydraulic system and method for controlling the hoisting and lowering of the empty hook of a dynamic compaction machine. Background Technology

[0002] Dynamic compaction machines utilize the high impact energy generated by a heavy hammer falling from a great height to repeatedly compact soft ground. In current civil engineering projects, dynamic compaction typically involves using winches or hydraulic equipment to repeatedly lift the hammer to a specified height and then release it via a release device. The energy generated by the hammer's descent creates a powerful impact on the ground, thereby increasing its bearing capacity. This process requires the hammer to be released and re-engaged using the release device each time, repeating the lifting cycle. Dynamic compaction machines are widely used in siltation and land reclamation projects.

[0003] According to available data, the current dynamic compaction operation process of a dynamic compaction machine is as follows:

[0004] ① To perform the hoisting action, the operator must keep pressing the hoisting button and pulling the handle backward. If the hoisting button is released or the handle is not pulled backward during operation, the hoisting operation will be interrupted. When the hammer is raised to a certain height, the unhooking device will release the hook, and the hammer will fall almost freely.

[0005] ② Lower the empty hook by pressing the empty hook lowering button and pushing the handle forward. When the counterweight is on the ground, the unhooking device needs to be engaged with it, which requires lowering the unhooking device from mid-air using the empty hook lowering method.

[0006] Chinese patent document CN103288001A discloses an "automatic hammer-hanging winch mechanism for a dynamic compaction machine." It employs a hydraulic motor mounted on a bracket on one side of the winch base, and the winch drum mounted on a bracket on the other side of the winch base. The hydraulic motor and the winch drum are rotatably connected via an electromagnetic clutch. A hydraulic control valve assembly is mounted on the winch base. One end of a wire rope tension sensor is fixed to the winch base, and the other end senses the pressure roller pressing against a row of guide and positioning wire ropes wound on the winch drum. Hydraulic brakes, mounted on the winch base, are located on both sides of the winch drum turntable. This technical solution requires the operator to continuously press and hold the winch's lifting button and pull the handle backward, which is prone to misoperation. Summary of the Invention

[0007] This invention primarily addresses the technical problem of existing solutions requiring operators to continuously press and hold the hoist's lifting button while pulling the handle backward, which easily leads to misoperation. It provides an electromechanical-hydraulic system and method for controlling the hoisting and lowering of the empty hook of a dynamic compaction machine. Electrical self-locking via a relay solves the problem of needing to press the lifting button for an extended period during the lifting process. A normally closed external brake is employed, and a pressure switch is installed on the working oil circuit controlling the external brake to address issues of misoperation and low safety.

[0008] The above-mentioned technical problems of the present invention are mainly solved by the following technical solutions:

[0009] An electromechanical-hydraulic system for controlling the hoisting and lowering of a dynamic compaction machine includes a hoisting assembly and a lowering assembly connected in parallel, and a working oil circuit for controlling the outer hook, wherein a pressure switch P is provided on the working oil circuit.

[0010] Preferably, the lifting component includes a lifting button SB1, one end of which is connected to the power supply, and the other end is grounded via a relay KM1 and a lifting solenoid valve Y1 in sequence. A freewheeling diode is connected in parallel with the solenoid valve Y1.

[0011] Preferably, the relay KM1 includes a coil KA1 connected in parallel, a normally open contact K1 of the relay KM1, and a normally open contact K2 of the relay KM1. The coil KA1 is connected in parallel with a freewheeling diode. The normally open contact K1 of the relay KM1 is grounded through the lifting solenoid valve Y1, and the normally open contact K2 of the relay KM1 is connected to the lowering assembly.

[0012] Preferably, the lowering component includes a lowering button SB2, one end of which is connected to the power supply, and the other end is grounded through a relay KM2 and a lowering solenoid valve Y2. A freewheeling diode is connected in parallel with the solenoid valve Y2.

[0013] Preferably, the relay KM2 includes a coil KA2 and a normally closed contact K3. One end of the coil KA2 is connected to the release button SB2, and the other end is grounded through a pressure switch P. A freewheeling diode is connected in parallel with the coil KA2. The normally closed contact K3 of the relay KM2 is connected to the normally open contact K2 of the relay KM1.

[0014] Preferably, a fuse FU is provided between the lifting component and the lowering component and the power supply terminal.

[0015] A method for operating an electromechanical-hydraulic system for controlling the hoisting and lowering of the empty hook of a dynamic compaction machine includes the following steps:

[0016] S1 connects to the power supply and initializes the system;

[0017] S2 Press the lifting button SB1, pull the handle backward to start the hoisting and lifting;

[0018] After the S3 lifting operation is completed, the hammer is driven by the unhooker and smashes into the ground;

[0019] S4 Press and hold the lower button SB2, and push the handle forward to lower the hook without a load.

[0020] Preferably, step S2 specifically includes the following steps: when the lifting button SB1 is pressed, the coil KA1 of the relay KM1 is energized, its two normally open contacts K1 and K2 are closed, the lifting solenoid valve Y1 is activated, the handle is pulled back to perform the lifting operation, and the lifting button SB1 is released after being pressed. At this time, the contact K2 is in the closed state. Since the K2 contact of the relay KM1 is connected to the normally closed contact K3 of the relay KM2, and the other end of the K3 contact is a normally energized port, the relay KM1 is in the energized state. The state of the relay KM1 will not change after the lifting button SB1 is pressed and released. Its contacts K1 and K2 are always closed, and the lifting solenoid valve Y1 is always activated, thereby realizing electrical self-locking and thus realizing self-locking during the lifting process.

[0021] As a preferred option, if the lowering button SB2 is accidentally pressed during the hoisting process, since the pressure switch P is located in the working oil circuit of the control arm, the pressure switch P will only close when the handle is pushed forward. Therefore, the relay KM2 will not be energized, the contact K3 will remain closed, the handle will still be pulled backward, the hoist will remain in the hoisting state, and no lowering operation will be performed.

[0022] Preferably, step S4 specifically includes pressing down the release button SB2 and pushing the handle forward, allowing oil to enter the working oil circuit of the normally closed external brake. At this time, the release button SB2 is closed, the pressure switch P is closed, the coil KA2 of the relay KM2 is energized, causing the normally closed contact K3 to open, the relay KM1 is de-energized, and the contacts K1 and K2 change from the closed state to the open state, thereby de-energizing the lifting solenoid valve Y1. The lowering solenoid valve Y2 is directly controlled by the release button SB2, and the lowering solenoid valve Y2 is in operation.

[0023] The beneficial effects of this invention are: by using a relay to achieve electrical self-locking, the problem of needing to press the lifting button for a long time during the lifting process is solved; a normally closed external brake is used; and by installing a pressure switch in the working oil circuit of the external brake, the problems of misoperation and low safety are solved. Attached Figure Description

[0024] Figure 1 This is a circuit diagram of an initial state of the present invention.

[0025] Figure 2 This is a circuit diagram of the state of pressing the lift button according to the present invention.

[0026] Figure 3 This is a circuit diagram of the released state after the lifting button is pressed, according to the present invention.

[0027] Figure 4 This is a circuit diagram of pressing SB2 during the lifting process of the present invention.

[0028] Figure 5 This is a circuit diagram of the lifting process of the present invention, in which SB2 is pressed and the handle is pushed forward.

[0029] The diagram shows: FU fuse, SB1 lift button, SB2 lower button, KM1 relay, KM1 normally open contact, K2 relay, KM2 normally closed contact, K3 relay, Y1 lift solenoid valve, P pressure switch, KM2 relay, and Y2 lower solenoid valve. Detailed Implementation

[0030] The technical solution of the present invention will be further described in detail below through embodiments and in conjunction with the accompanying drawings.

[0031] Example: This example describes an electromechanical-hydraulic system and method for controlling the hoisting and lowering of the empty hook of a dynamic compaction machine, such as... Figure 1 As shown, including

[0032] The electromechanical-hydraulic system controlling the hoisting and lowering of the empty hook of the dynamic compaction machine includes: fuse FU, lifting button SB1, lowering button SB2, relay KM1, lifting solenoid valve Y1, pressure switch P, relay KM2, and lowering solenoid valve Y2.

[0033] One end of the lift button SB1 is connected to the power supply, and the other end is grounded via relay KM1 and lift solenoid valve Y1. A freewheeling diode is connected in parallel with solenoid valve Y1. Relay KM1 includes a coil KA1 connected in parallel, a normally open contact K1, and a normally open contact K2. A freewheeling diode is connected in parallel with coil KA1, and the normally open contact K1 is grounded via lift solenoid valve Y1. One end of the lower button SB2 is connected to the power supply, and the other end is grounded via relay KM2 and lower solenoid valve Y2. A freewheeling diode is connected in parallel with solenoid valve Y2. Relay KM2 includes a coil KA2 and a normally closed contact K3. One end of coil KA2 is connected to the lower button SB2, and the other end is grounded via pressure switch P. A freewheeling diode is connected in parallel with coil KA2, and the normally closed contact K3 is connected to the normally open contact K2 of relay KM1. A fuse FU is installed between the lift button SB1, the lower button SB2 and the power supply.

[0034] First, in this system, to stabilize the system circuit current, both the relays and solenoid valves are equipped with freewheeling diodes; the fuse FU is connected in series in the circuit to protect the system.

[0035] When the lifting button SB1 is pressed, the coil KA1 of the relay KM1 is energized, and its two normally open contacts K1 and K2 close, the lifting solenoid valve Y1 is activated, and the handle is pulled back to perform the lifting operation.

[0036] When the lifting button SB1 is pressed and released, contact K2 is closed because the button was previously pressed. Since contact K2 and normally closed contact K3 of relay KM1 are always connected, and the other end of contact K3 is a normally energized port, relay KM1 is energized. The state of relay KM1 remains unchanged after the lifting button SB1 is released. That is, when the lifting button SB1 is pressed and released, the coil KA1 of relay KM1 is also energized, and its contacts K1 and K2 remain closed. The lifting solenoid valve Y1 remains operational, thus achieving electrical self-locking and, consequently, self-locking during the lifting process. However, if the operator accidentally touches the lowering button SB2, the pressure switch P, located in the working oil circuit controlling the external winch, only closes when the handle is pushed forward. Therefore, relay KM2 is not energized, contact K3 remains closed, the handle remains pulled backward, and the winch remains in the lifting state, preventing a lowering operation and thus avoiding accidental operation.

[0037] After the dynamic compaction machine is lifted, the hammer is driven by the unhooking device and smashes into the ground. When it is necessary to lower the empty hook, the operator presses the lowering button SB2 and pushes the handle forward. Oil enters the working oil circuit of the normally closed external brake. At this time, the lowering button SB2 closes, the pressure switch P closes, the coil KA2 of the relay KM2 is energized, causing the normally closed contact K3 to open. Then, the relay KM1, which was originally energized, is de-energized, and the contacts K1 and K2 change from the closed state to the open state, thereby de-energizing the lifting solenoid valve Y1. The lowering solenoid valve Y2 is directly controlled by the lowering button SB2, so the lowering solenoid valve Y2 is working.

Claims

1. An electromechanical-hydraulic system for controlling the hoisting and lowering of the empty hook of a dynamic compaction machine, characterized in that, It includes a lifting assembly and a lowering assembly arranged in parallel, and also includes a working oil circuit for controlling the external bearing. The working oil circuit is equipped with a pressure switch P. The relay KM1 includes a coil KA1 connected in parallel, a normally open contact K1 of the relay KM1 and a normally open contact K2 of the relay KM1. The coil KA1 is connected in parallel with a freewheeling diode. The normally open contact K1 of the relay KM1 is grounded through the lifting solenoid valve Y1. The normally open contact K2 of the relay KM1 is connected to the lowering assembly. The lowering component includes a lowering button SB2. One end of the lowering button SB2 is connected to the power supply, and the other end is grounded through a relay KM2 and a lowering solenoid valve Y2. A freewheeling diode is connected in parallel with the solenoid valve Y2.

2. The electromechanical-hydraulic system for controlling the hoisting and lowering of the empty hook of a dynamic compaction machine according to claim 1, characterized in that, The lifting assembly includes a lifting button SB1. One end of the lifting button SB1 is connected to the power supply, and the other end is grounded through a relay KM1 and a lifting solenoid valve Y1 in sequence. A freewheeling diode is connected in parallel with the solenoid valve Y1.

3. The electromechanical-hydraulic system for controlling the hoisting and lowering of the empty hook of a dynamic compaction machine according to claim 1, characterized in that, The relay KM2 includes a coil KA2 and a normally closed contact K3. One end of the coil KA2 is connected to the release button SB2, and the other end is grounded through a pressure switch P. A freewheeling diode is connected in parallel with the coil KA2. The normally closed contact K3 of the relay KM2 is connected to the normally open contact K2 of the relay KM1.

4. The electromechanical-hydraulic system for controlling the hoisting and lowering of the empty hook of a dynamic compaction machine according to claim 1, characterized in that, If the operator accidentally touches the lowering button SB2, the pressure switch P is located in the working oil circuit of the control arm. The pressure switch P will only close when the handle is pushed forward. Therefore, the relay KM2 will not be energized, the contact K3 will remain closed, the handle will still be pulled back, the winch will remain in the lifting state, and no lowering operation will be performed.

5. The electromechanical-hydraulic system for controlling the hoisting and lowering of the empty hook of a dynamic compaction machine according to claim 1, characterized in that, A fuse FU is provided between the lifting component and the lowering component and the power supply terminal, and the fuse FU is connected in series in the circuit.

6. A method for operating an electromechanical-hydraulic system for controlling the hoisting and lowering of the empty hook of a dynamic compaction machine, characterized in that, Includes the following steps: S1 connects to the power supply and initializes the system; S2 presses the lifting button SB1, pulls the handle backward to perform hoisting and lifting. When the lifting button SB1 is pressed, the coil KA1 of the relay KM1 is energized, and its two normally open contacts K1 and K2 are closed. The lifting solenoid valve Y1 is activated, and the handle is pulled backward to perform the lifting operation. The lifting button SB1 is released after being pressed, and at this time the contact K2 is in the closed state. After the S3 lifting operation is completed, the hammer is driven by the unhooker and smashes into the ground; S4 Press and hold the lower button SB2 and push the handle forward to lower the empty hook. Pushing the handle forward will allow oil to enter the working oil circuit of the normally closed external brake. At this time, the lower button SB2 will close and the pressure switch P will close.

7. The working method of the electromechanical-hydraulic system for controlling the hoisting and lowering of the empty hook of a dynamic compaction machine according to claim 6, characterized in that, Step S2 specifically includes the following: Since the K2 contact of relay KM1 is connected to the normally closed contact K3 of relay KM2, and the other end of the K3 contact is a normally energized port, relay KM1 is in an energized state. The state of relay KM1 will not change after the lifting button SB1 is pressed and released. Its contacts K1 and K2 are always closed, and the lifting solenoid valve Y1 is always working, thereby realizing electrical self-locking and thus realizing self-locking during the lifting process.

8. The working method of the electromechanical-hydraulic system for controlling the hoisting and lowering of the empty hook of a dynamic compaction machine according to claim 6, characterized in that, If the lowering button SB2 is accidentally pressed during the hoisting process, the pressure switch P is located in the working oil circuit of the control arm. The pressure switch P will only close when the handle is pushed forward. Therefore, the relay KM2 will not be energized, the contact K3 will remain closed, the handle will still be pulled backward, the hoist will remain in the hoisting state, and the lowering operation will not be performed.

9. The working method of the electromechanical-hydraulic system for controlling the hoisting and lowering of the empty hook of a dynamic compaction machine according to claim 6, characterized in that, Step S4 specifically includes pressing down the release button SB2, energizing the coil KA2 of relay KM2, causing the normally closed contact K3 to open, de-energizing relay KM1, and switching contacts K1 and K2 from the closed state to the open state, thereby de-energizing the lifting solenoid valve Y1. The lowering solenoid valve Y2 is directly controlled by the release button SB2, and the lowering solenoid valve Y2 is activated.

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