A logic control valve

Abstract

The utility model provides a kind of logic control valve.The logic control valve package oil tank, first normally open solenoid valve, hydraulic pump, first energy accumulator, normally closed solenoid valve, shuttle valve, second normally open solenoid valve and brake;First oil circuit is connected with hydraulic pump and second normally open solenoid valve, second oil circuit is connected with second normally open solenoid valve and first normally open solenoid valve, third oil circuit is connected with first normally open solenoid valve and clutch mechanism, and the second oil circuit is connected with the first energy accumulator;Fourth oil circuit is connected with second normally open solenoid valve and normally closed solenoid valve, fifth oil circuit is connected with normally closed solenoid valve and brake, and the fifth oil circuit is connected with shuttle valve, and the fourth oil circuit is connected with second energy accumulator;Eighth oil circuit is connected with first normally open solenoid valve and oil tank, ninth oil circuit is connected with second normally open solenoid valve and oil tank, and tenth oil circuit is connected with normally closed solenoid valve and oil tank connection.The utility model can realize composite control, and improve the safety of dynamic compactor.

Description

Technical Field

[0001] This utility model relates to the field of dynamic compaction machine technology, and in particular to a logic control valve. Background Technology

[0002] The dynamic compaction machine is equipped with a winch, and a tamping hammer is mounted on the winch wire rope. During the compaction operation, the winch system controls the tension of the wire rope, which, in conjunction with the impact force of the tamping hammer, compacts the foundation in layers.

[0003] like Figure 2 As shown, the winch 15 of the dynamic compaction machine is driven to lower or stop by a hydraulic motor 16. A clutch mechanism 6 is provided on the winch 15. When the clutch mechanism 6 is activated to engage the hydraulic motor 16 with the winch 15, the hydraulic motor 16 drives the winch 15 to operate. A direct-acting disc brake 28 is provided on the winch 15, which brakes the winch 15 by pressing the brake pedal.

[0004] The existing control method for lowering the ram is to use the clutch control of the winch. In case of an emergency (such as a power outage in the electrical system), the winch cannot be effectively controlled, which can easily lead to safety accidents. Utility Model Content

[0005] The purpose of this invention is to provide a logic control valve that can achieve composite control and improve the safety of dynamic compaction machines.

[0006] The technical solution of this utility model is: a logic control valve, including an oil tank, a first normally open solenoid valve, a hydraulic pump, a first accumulator, a normally closed solenoid valve, a shuttle valve, a second normally open solenoid valve, and a brake disposed adjacent to the winch;

[0007] The hydraulic pump is connected to the second normally open solenoid valve through the first oil circuit, the second normally open solenoid valve is connected to the first normally open solenoid valve through the second oil circuit, the first normally open solenoid valve is connected to the clutch mechanism through the third oil circuit, and the first accumulator is connected to the second oil circuit.

[0008] The second normally open solenoid valve is connected to the normally closed solenoid valve through the fourth oil circuit. The normally closed solenoid valve is connected to the brake through the fifth oil circuit. A shuttle valve is connected to the fifth oil circuit. A second accumulator is connected to the fourth oil circuit.

[0009] The first normally open solenoid valve is connected to the oil tank through the eighth oil circuit, the second normally open solenoid valve is connected to the oil tank through the ninth oil circuit, and the normally closed solenoid valve is connected to the oil tank through the tenth oil circuit.

[0010] Preferably, a pressure reducing valve is connected to the second oil circuit, and the pressure reducing valve is connected to the eighth oil circuit. The pressure reducing valve reduces the high-pressure hydraulic oil to a set pressure before inputting the hydraulic oil into the clutch mechanism.

[0011] Preferably, the second oil circuit is further provided with a check valve, and an overflow valve is connected to the second oil circuit. The overflow valve is located between the check valve and the first normally open solenoid valve, and the overflow valve is connected to the eighth oil circuit.

[0012] Preferably, a pressure transmitter is connected to the shuttle valve. The pressure transmitter has a built-in sensor for sensing the pressure parameters of the hydraulic fluid in the logic control valve and converting them into electrical signals to be sent to the control system.

[0013] Preferably, a check valve is provided on the fourth oil line.

[0014] Preferably, the logic control valve further includes a brake pedal assembly, which includes a three-position valve and a pedal connected to the three-position valve and driving the three-position valve to operate. The three-position valve is connected to a shuttle valve through a sixth oil passage and to a second accumulator through a seventh oil passage.

[0015] Compared with related technologies, the beneficial effects of this utility model are as follows:

[0016] I. This utility model adopts a composite control mode of electric control and manual control, and realizes electrical logic composite control. Even in the event of electrical system failure, the winch can still be controlled, thereby improving the safety of the dynamic compaction machine.

[0017] Second, this utility model adds a brake pedal assembly to ensure that the winch can be braked by pressing the brake pedal even when the power is off, thus achieving safe control.

[0018] Third, this utility model can perform composite control of the winch clutch and brake in the dynamic compaction mode. Attached Figure Description

[0019] Figure 1 A schematic diagram of the logic control valve provided by this utility model;

[0020] Figure 2 This is a schematic diagram of the hoist structure.

[0021] In the attached diagram: 1. First normally open solenoid valve; 2. Hydraulic pump; 3. First accumulator; 4. Normally closed solenoid valve; 5. Shuttle valve; 6. Clutch mechanism; 7. Brake; 8. Brake pedal assembly; 81. Pedal; 82. Three-position valve; 9. Second normally open solenoid valve; 10. Second accumulator; 11. Pressure transmitter; 12. Relief valve; 13. Pressure reducing valve; 14. Check valve; 15. Winch; 16. Hydraulic motor; 17. First hydraulic circuit; 18. Second hydraulic circuit; 19. Third hydraulic circuit; 20. Fourth hydraulic circuit; 21. Fifth hydraulic circuit; 22. Sixth hydraulic circuit; 23. Seventh hydraulic circuit; 24. Eighth hydraulic circuit; 25. Ninth hydraulic circuit; 26. Tenth hydraulic circuit; 27. Oil tank; 28. Direct-acting disc brake. Detailed Implementation

[0022] The present invention will be described in detail below with reference to the accompanying drawings and embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in the embodiments of the present invention can be combined with each other. For ease of description, the terms "upper," "lower," "left," and "right" appearing below only indicate that they correspond to the upper, lower, left, and right directions in the accompanying drawings and do not limit the structure.

[0023] like Figure 1 , Figure 2 As shown, this embodiment provides a logic control valve for controlling the engagement or disengagement of the clutch mechanism 6 with the winch 15, and for braking the winch 15. The logic control valve includes an oil tank 27, a first normally open solenoid valve 1, a hydraulic pump 2, a first accumulator 3, a normally closed solenoid valve 4, a shuttle valve 5, a brake pedal assembly 8, a second normally open solenoid valve 9, and a brake 7 disposed adjacent to the winch 15.

[0024] The hydraulic pump 2 is connected to the second normally open solenoid valve 9 via the first oil circuit 17. The second normally open solenoid valve 9 is connected to the first normally open solenoid valve 1 via the second oil circuit 18. The first normally open solenoid valve 1 is connected to the clutch mechanism 6 via the third oil circuit 19. The first accumulator 3 is connected to the second oil circuit 18. A pressure reducing valve 13 and a check valve 14 are connected to the second oil circuit 18. The pressure reducing valve 13 is connected to the eighth oil circuit 24. A relief valve 12 is connected to the second oil circuit 18. The relief valve 12 is located between the check valve 14 and the first normally open solenoid valve 1, and the relief valve 12 is connected to the eighth oil circuit 24.

[0025] The second normally open solenoid valve 9 is connected to the normally closed solenoid valve 4 via the fourth oil circuit 20. The normally closed solenoid valve 4 is connected to the brake 7 via the fifth oil circuit 21. A shuttle valve 5 is connected to the fifth oil circuit 21, and a second accumulator 10 is connected to the fourth oil circuit 20. A pressure transmitter 11 is connected to the shuttle valve 5. A check valve 14 is provided on the fourth oil circuit 20.

[0026] The first normally open solenoid valve 1 is connected to the oil tank 27 via the eighth oil passage 24, the second normally open solenoid valve 9 is connected to the oil tank 27 via the ninth oil passage 25, and the normally closed solenoid valve 4 is connected to the oil tank 27 via the tenth oil passage 26. The eighth oil passage 24, the ninth oil passage 25, and the tenth oil passage 26 form a return oil passage.

[0027] The brake pedal assembly 8 includes a three-position valve 82 and a pedal 81 connected to the three-position valve 82 and driving the three-position valve 82 to operate. The three-position valve 82 is connected to the shuttle valve 5 through a sixth oil passage 22 and to the second accumulator 10 through a seventh oil passage 23.

[0028] The operating mode of winch 15 is as follows: Hydraulic pump 2 is started to charge and store energy in the first accumulator 3. Hydraulic oil flows sequentially from the first oil circuit 17, the second normally open solenoid valve 9 (P to A), the second oil circuit 18, the pressure reducing valve 13, the check valve 14, and the first normally open solenoid valve 1 to the clutch mechanism 6, engaging the winch 15 with the hydraulic motor 16, at which point the winch 15 begins to operate. The stopping of the winch 15 is controlled by the hydraulic motor 16. The winch 15 has two operation modes: manual and automatic. In manual mode, the winch 15 is operated via a handle. In automatic mode, a control program is set and executed to control the winch 15's operation. During normal operation, the first normally open solenoid valve 1, the second normally open solenoid valve 9, and the normally closed solenoid valve 4 are prohibited from being energized to avoid the risk of clutch mechanism 6 malfunctioning and brake release if energized.

[0029] The normally closed solenoid valve 4 is a Y-type solenoid valve, and the first normally open solenoid valve 1 and the second normally open solenoid valve 9 are C-type solenoid valves.

[0030] When braking in manual mode, the second normally open solenoid valve 9 is energized, followed by the first normally open solenoid valve 1. This disconnects the operating circuit of the winch 15, and the clutch mechanism 6 disengages the winch 15 from the hydraulic motor 16, thus braking the winch 15. The first normally open solenoid valve 1 can only be energized and switched to the same configuration (A-to-T, P-to-B) after the second normally open solenoid valve 9 is energized. This is to prevent the winch 15 from falling or overturning during ascent due to a power outage.

[0031] During braking in automatic dynamic compaction mode, hydraulic pump 2 is activated to charge and store energy in the second accumulator 10. At this time, the second normally open solenoid valve 9 is energized and switched, followed by the normally closed solenoid valve 4. Hydraulic oil flows sequentially from the first oil circuit 17, the second normally open solenoid valve 9, the fourth oil circuit 20, the check valve 14, the normally closed solenoid valve 4, the fifth oil circuit 21, and the shuttle valve 5 into the brake 7. The brake pads (unlabeled) on the brake 7 extend and grip the drum of the winch 15, achieving braking. In this mode, the normally closed solenoid valve 4 can only be energized and switched to the following configuration: port A connects to port T, and port P connects to port B. This prevents a sudden power outage during wire rope release, which could cause the clutch mechanism 6 to engage with the winch 15, potentially leading to the equipment overturning.

[0032] Emergency braking mode: Depressing pedal 81 actuates the three-position valve 82 downwards. Figure 1 (Direction), so that the uppermost valve position is connected to the sixth oil circuit 22 and the seventh oil circuit 23. At this time, the hydraulic oil in the second accumulator 10 is output into the seventh oil circuit 23, and after entering the three-position valve 82, it is output from the sixth oil circuit 22, and then enters the shuttle valve 5 to reach the brake 7, activating the brake 7 to brake the winch 15.

[0033] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made based on the content of this utility model specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A logic control valve for controlling the engagement or disengagement of a clutch mechanism (6) with a winch (15) and for braking the winch (15), characterized in that, Includes an oil tank (27), a first normally open solenoid valve (1), a hydraulic pump (2), a first accumulator (3), a normally closed solenoid valve (4), a shuttle valve (5), a second normally open solenoid valve (9), and a brake (7) disposed adjacent to the winch (15); The hydraulic pump (2) is connected to the second normally open solenoid valve (9) through the first oil circuit (17), the second normally open solenoid valve (9) is connected to the first normally open solenoid valve (1) through the second oil circuit (18), the first normally open solenoid valve (1) is connected to the clutch mechanism (6) through the third oil circuit (19), and the first accumulator (3) is connected to the second oil circuit (18). The second normally open solenoid valve (9) is connected to the normally closed solenoid valve (4) through the fourth oil circuit (20). The normally closed solenoid valve (4) is connected to the brake (7) through the fifth oil circuit (21). A shuttle valve (5) is connected to the fifth oil circuit (21). A second accumulator (10) is connected to the fourth oil circuit (20). The first normally open solenoid valve (1) is connected to the oil tank (27) through the eighth oil circuit (24), the second normally open solenoid valve (9) is connected to the oil tank (27) through the ninth oil circuit (25), and the normally closed solenoid valve (4) is connected to the oil tank (27) through the tenth oil circuit (26).

2. The logic control valve according to claim 1, characterized in that, A pressure reducing valve (13) is connected to the second oil circuit (18), and the pressure reducing valve (13) is connected to the eighth oil circuit (24).

3. The logic control valve according to claim 2, characterized in that, The second oil circuit (18) is also provided with a check valve (14), and an overflow valve (12) is connected to the second oil circuit (18). The overflow valve (12) is located between the check valve (14) and the first normally open solenoid valve (1). The overflow valve (12) is connected to the eighth oil circuit (24).

4. The logic control valve according to claim 1, characterized in that, A pressure transmitter (11) is connected to the shuttle valve (5).

5. The logic control valve according to claim 1, characterized in that, The fourth oil circuit (20) is equipped with a check valve (14).

6. The logic control valve according to claim 1, characterized in that, It also includes a brake pedal assembly (8), which includes a three-position valve (82) and a pedal (81) connected to the three-position valve (82) and driving the three-position valve (82) to operate. The three-position valve (82) is connected to the shuttle valve (5) through a sixth oil passage (22) and to the second accumulator (10) through a seventh oil passage (23).

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