Winch mechanism hydraulic system, winch system and engineering machinery

Abstract

The present disclosure relates to a winch mechanism hydraulic system, a winch system and engineering machinery, wherein the winch mechanism hydraulic system comprises: a hydraulic pump (1); a reversing valve (2) provided on an oil supply oil circuit of the hydraulic pump (1); a hydraulic motor (3) provided on a working oil circuit of the reversing valve (2) and configured to provide a driving force to the winch mechanism, the hydraulic motor (3) having a lifting chamber (31) and a lowering chamber (32); a balancing valve (4) provided on a working oil circuit between the reversing valve (2) and the lifting chamber (31); a starting control valve (5) provided with a control oil circuit (51) therein, the control oil circuit (51) being configured to provide hydraulic oil of a first preset pressure to a first oil circuit (41) between the lifting chamber (31) and the balancing valve (4) during a process in which the winch mechanism performs a lowering action; and an accumulator (6) connected to the first oil circuit (41) via an oil circuit inside the starting control valve (5).

Description

Technical Field

[0001] The present disclosure relates to the technical field of mobile lifting equipment, and in particular to a winch mechanism hydraulic system, a winch system and engineering machinery. Background Art

[0002] The hydraulic system of the winch mechanism of a hydraulic crane is the power and control means for the winch mechanism to work. The quality of its performance has a great impact on the performance of the crane, and directly affects the safety, reliability and efficiency of the crane's operation.

[0003] In the prior art known to the inventors, during the operation of the hoisting mechanism of large-scale construction machinery such as cranes and rammers, heavy-load starting will occur. At the moment of heavy-load starting, the energy of the hoisting mechanism will be instantly loaded to the motor and the balance valve, and eventually a corresponding pressure will be formed between the motor and the balance valve to lift the heavy object. Due to the instantaneous loading of energy, the motor and the balance valve will be subjected to an instantaneous high-pressure shock, and the extent of the shock is determined by the load energy of the hoisting mechanism. This shock can be quickly transmitted to the hoisting mechanism and cause vibration. If the mechanism is installed on a structure with a vibration amplification effect, such as an arm, the vibration will be more obvious. This vibration will reduce the life of the hydraulic seal, reduce the comfort of the operator, and in extreme cases, it will also cause safety problems. Summary of the Invention

[0004] The embodiments of the present disclosure provide a hoisting mechanism hydraulic system, a hoisting system, and engineering machinery, which can eliminate the hydraulic shock at the moment of heavy-load startup of the hoisting mechanism.

[0005] According to a first aspect of the present disclosure, a winch mechanism hydraulic system is provided, comprising:

[0006] Hydraulic pumps;

[0007] The reversing valve is installed on the oil supply line of the hydraulic pump;

[0008] A hydraulic motor is provided in the working oil circuit of the reversing valve and is configured to provide driving force to the hoisting mechanism. The hydraulic motor has a lifting chamber and a lowering chamber.

[0009] The balancing valve is located in the working oil circuit between the reversing valve and the lifting chamber;

[0010] A start-up control valve having a control oil circuit therein, the control oil circuit being configured to supply hydraulic oil of a first preset pressure to a first oil circuit between the lifting chamber and the balance valve during a lowering action of the hoisting mechanism; and

[0011] The accumulator is connected to the first oil circuit via the oil circuit inside the starting control valve.

[0012] In some embodiments, the starting control valve has a first oil port, a second oil port, a third oil port and a fourth oil port, the first oil port is connected to the lifting chamber, the second oil port is connected to the end of the balancing valve away from the reversing valve, the third oil port is arranged on the control oil circuit, and the fourth oil port is connected to the accumulator; the first oil port, the second oil port, the third oil port and the fourth oil port are all connected to the node, and the node is located inside the starting control valve.

[0013] In some embodiments, the startup control valve includes an explosion-proof valve, which is provided between the accumulator and the first oil circuit and is configured to prevent leakage of hydraulic oil in the first oil circuit in the event of failure of the accumulator.

[0014] In some embodiments, the explosion-proof valve includes a two-position, two-way valve. When the accumulator is working normally, the two-position, two-way valve is in the first position and is configured to connect the accumulator and the first oil circuit; when the accumulator fails, the two-position, two-way valve is in the second position and is configured to prevent the hydraulic oil in the first oil circuit from leaking.

[0015] In some embodiments, a working oil port of the two-position two-way valve communicates with the accumulator to lead out control oil to act on the outer end of the first position.

[0016] In some embodiments, the start-up control valve further includes a first throttle valve, which is disposed between the explosion-proof valve and the first oil circuit and is configured to adjust the flow of hydraulic oil flowing from the first oil circuit to the accumulator.

[0017] In some embodiments, the starting control valve further includes a second throttle valve, which is disposed in the control oil circuit.

[0018] In some embodiments, the startup control valve further includes a first one-way valve, which is disposed on the control oil circuit and configured to only allow the hydraulic oil to flow from the control oil circuit to the first oil circuit.

[0019] In some embodiments, the start-up control valve further includes a pressure measuring joint connected to the first oil circuit and configured to measure the pressure of the hydraulic oil in the first oil circuit.

[0020] According to a second aspect of the present disclosure, a hoisting system is provided, comprising:

[0021] reel;

[0022] a wire rope, one end of which is wound on a drum; and

[0023] The hydraulic system of the hoisting mechanism of the above embodiment;

[0024] Wherein, the hydraulic motor is configured to drive the reel to rotate.

[0025] According to a third aspect of the present disclosure, an engineering machine is provided, comprising the hoisting mechanism hydraulic system of the above embodiment or the hoisting system of the above embodiment.

[0026] Based on the above technical solution, the hydraulic system of the hoisting mechanism in the embodiment of the present invention can eliminate the hydraulic shock at the moment of heavy-load starting of the hoisting mechanism by arranging a starting control valve and an accumulator to absorb the impact of the first oil circuit, so that the hoisting mechanism can achieve smooth heavy-load starting during the lifting and lowering actions; at the same time, the accumulator can also effectively absorb other pressure shocks of the hydraulic system, making the hoisting mechanism move more smoothly, and can increase the life of the hydraulic seal, thereby improving the comfort of the operator and improving the safety of the hoisting mechanism and engineering machinery. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The drawings described herein are used to provide a further understanding of the present disclosure and constitute a part of this application. The illustrative embodiments of the present disclosure and their descriptions are used to explain the present disclosure and do not constitute an improper limitation of the present disclosure. In the drawings:

[0028] Figure 1 Schematic diagram of some embodiments of the hydraulic system of the hoisting mechanism disclosed herein.

[0029] Figure 2 Schematic diagram of some embodiments of the start control valve and accumulator of the winch mechanism hydraulic system disclosed in the present invention.

[0030] Description of Reference Numerals

[0031] 1. Hydraulic pump; 2. Reversing valve; 3. Hydraulic motor; 4. Balancing valve; 5. Starting control valve; 6. Accumulator; 7. Brake; 8. Shuttle valve; 31. Lifting chamber; 32. Lowering chamber; 41. First oil circuit; 42. Second one-way valve; 43. First relief valve; 51. Control oil circuit; 52. Explosion-proof valve; 521. First position; 522. Second position; 53. First throttle valve; 54. Second throttle valve; 55. First one-way valve; 56. Pressure measuring connector; A. First oil port; B. Second oil port; C. Third oil port; D. Fourth oil port; O. Node. DETAILED DESCRIPTION

[0032] The present disclosure is described in detail below. In the following paragraphs, various aspects of the embodiments are defined in more detail. Each aspect defined in this manner may be combined with any other aspect or aspects unless expressly stated not to be combinable. In particular, any feature considered to be preferred or advantageous may be combined with one or more other features considered to be preferred or advantageous.

[0033] The terms "first" and "second" appearing in this disclosure are only for the convenience of description to distinguish different components with the same name, and do not indicate a priority or primary and secondary relationship.

[0034] In the description of the present disclosure, it should be understood that the terms "inside", "outside", "up", "down", "left" and "right" indicate directions or positional relationships that are defined based on the starting control valve, control oil circuit or hydraulic system, etc., and are only for the convenience of describing the present disclosure, and do not indicate or imply that the device referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, it should not be understood as a limitation on the scope of protection of the present disclosure.

[0035] First, this disclosure proposes a hydraulic system for a hoisting mechanism, hereinafter referred to as the "hydraulic system." This hydraulic system can be used in hydraulic cranes, as well as in any other construction machinery, such as dynamic rammers, where the hydraulic system provides a power source for the hoisting mechanism. Some of the subsequent embodiments will be described using a hydraulic crane as an example. To clarify the content of this disclosure and to facilitate its description, definitions of certain abbreviations and key terms are provided herein. These definitions do not limit the scope of this disclosure:

[0036] Hydraulic motor: An actuator that drives the load to lift and lower.

[0037] Heavy load start: After the lifting or lowering action of the hoisting mechanism has been implemented and the action has stopped, but the hoisting mechanism is still carrying a load, the operation of lifting or lowering the hoisting mechanism again is implemented.

[0038] In some exemplary embodiments, Figure 1 and Figure 2 As shown, the present disclosure proposes a winch mechanism hydraulic system, comprising:

[0039] Hydraulic pump 1;

[0040] The reversing valve 2 is provided on the oil supply line of the hydraulic pump 1;

[0041] The hydraulic motor 3 is provided in the working oil circuit of the reversing valve 2 and is configured to provide driving force to the hoisting mechanism. The hydraulic motor 3 has a lifting chamber 31 and a lowering chamber 32;

[0042] The balancing valve 4 is provided in the working oil path between the reversing valve 2 and the lifting chamber 31;

[0043] A start-up control valve 5 is provided with a control oil circuit 51 therein, wherein the control oil circuit 51 is configured to supply hydraulic oil of a first preset pressure to a first oil circuit 41 between the lifting chamber 31 and the balancing valve 4 during the process of the hoisting mechanism performing a falling action; and

[0044] The accumulator 6 is connected to the first oil passage 41 via the oil passage inside the startup control valve 5 .

[0045] Specifically, the hydraulic pump 1 is the power element of the hydraulic system, providing flow and pressure output for the hydraulic system. Specifically, the balancing valve 4 includes a second one-way valve 42 and a first relief valve 43 arranged in parallel. Specifically, the balancing valve 4 can actively control negative loads while not affecting the execution of positive loads. Specifically, the pressure of the accumulator 6 is selected to match the hydraulic system. Optionally, the first preset pressure can be less than 10 bar. Optionally, the balancing valve 4 and the start-up control valve 5 can be structurally integrated.

[0046] Specifically, the winch mechanism hydraulic system also includes a brake 7 and a shuttle valve 8. The two oil ports of shuttle valve 8 are connected to the two working oil circuits of the reversing valve 2, respectively. The outlet of shuttle valve 8 is connected to the oil inlet of brake 7. When the oil pressure entering brake 7 exceeds a preset pressure, it overcomes the spring resistance and releases the brake. Specifically, the control oil at the end of the first relief valve 43 is connected to the working oil circuit on the side of the descending chamber 32.

[0047] Specifically, at the moment the brake 7 is released, the starting control valve 5 and the accumulator 6 cooperate to absorb the starting impact of the load energy transmitted to the hoisting mechanism, and also absorb the high-pressure impact between the hydraulic motor 3 and the balancing valve 4, that is, the high-pressure impact of the first oil circuit.

[0048] Specifically, the control oil circuit 51 can increase the stiffness of the oil between the hydraulic motor 3 and the counterbalance valve 4, thereby improving the shock resistance of the oil between the hydraulic motor 3 and the counterbalance valve 4. Specifically, it improves the shock resistance of the oil in the first oil circuit 41, and helps to extend the life of components such as the hydraulic motor 3. Specifically, during heavy-load startup, the energy of the hoisting mechanism is instantly applied to the hydraulic motor 3 and the counterbalance valve 4. Due to this instantaneous energy loading, the first oil circuit 41 generates a transient high-pressure shock, which the accumulator 6 can effectively absorb.

[0049] More specifically, during the process of the hoisting mechanism performing the lifting action, the reversing valve 2 is in the left position, and the hydraulic oil of the hydraulic pump 1 enters the first oil circuit 41 through the second one-way valve 42 of the balancing valve 4, or the A\B port oil circuit of the starting control valve 5, and finally enters the lifting chamber 31 of the hydraulic motor 3. Before the brake 7 is opened, a certain pressure is established between the hydraulic motor 3 and the balancing valve 4, and then the brake 7 is opened (the brake is released), and the load energy of the hoisting mechanism is instantaneously transferred to the hydraulic motor 3. The pressure that has been established between the balancing valve 4 and the hydraulic motor 3 and the accumulator 6 can absorb the pressure shock caused by the instantaneous transfer of load energy, thereby enabling the hoisting mechanism to achieve a smooth heavy-load start. After the lifting action is smoothly started, the accumulator 6 can also effectively absorb the pressure shock of the hydraulic system, making the lifting action smoother.

[0050] More specifically, during the lowering process of the hoisting mechanism, the reversing valve 2 is in the right position, and the hydraulic oil from the hydraulic pump 1 passes through the reversing valve 2 directly into the lowering chamber 32 of the hydraulic motor 3. At the same time, the control oil circuit 51 provides pressure oil of less than 10 bar at the start control valve C port to enter the lifting chamber 31 of the hydraulic motor 3, thereby establishing back pressure to reduce impact. The pressure oil in the lowering chamber 32 of the hydraulic motor 3 activates the brake 7 and then opens the balancing valve 4. If the hoisting mechanism is already loaded, the impact caused by the instantaneous transfer of load energy when the brake 7 is opened can be absorbed by the accumulator 6, and the energy is transferred smoothly, thereby achieving a smooth heavy-load start of the hoisting mechanism and a smooth lowering operation. If there is no load, no instantaneous impact will be generated between the hydraulic motor 3 and the balancing valve 4 when the brake 7 is opened, and the lowering operation will proceed smoothly. After the lowering operation is smoothly started, the accumulator 6 can also effectively absorb the pressure impact of the hydraulic system, making the lowering operation even smoother.

[0051] The hydraulic system of the hoisting mechanism of this embodiment can eliminate the hydraulic shock at the moment of heavy-load starting of the hoisting mechanism by arranging a starting control valve and an accumulator to absorb the impact of the first oil circuit, so that the hoisting mechanism can achieve smooth heavy-load starting during both the lifting and lowering actions; at the same time, the accumulator can also effectively absorb other pressure shocks of the hydraulic system, making the hoisting mechanism move more smoothly, and can increase the life of the hydraulic seal, thereby improving the comfort of the operator and improving the safety of the hoisting mechanism and engineering machinery.

[0052] In some embodiments, as Figure 1 and Figure 2 As shown, the starting control valve 5 has a first oil port A, a second oil port B, a third oil port C and a fourth oil port D. The first oil port A is connected to the lifting chamber 31, the second oil port B is connected to the end of the balancing valve 4 away from the reversing valve 2, the third oil port C is arranged on the control oil circuit 51, and the fourth oil port D is connected to the accumulator 6; the first oil port A, the second oil port B, the third oil port C and the fourth oil port D are all connected to the node O, and the node O is located inside the starting control valve 5.

[0053] Specifically, the first oil circuit 41 between the lifting chamber 31 and the balancing valve 4 is the oil circuit between the first oil port A and the second oil port B of the start control valve 5. Specifically, the control oil circuit 51 can extend outside the start control valve 5 through the third oil port C.

[0054] The starting control valve 5 of this embodiment can be conveniently installed in the hydraulic system of the hoisting mechanism through various oil ports, so that the hydraulic system has better operating performance, while improving the working environment of the hydraulic components and increasing the life of the components. By matching and controlling the starting control valve 5 with the accumulator 6 and the balancing valve 4, brake 7, shuttle valve 8 and other components, smooth control of the heavy-load starting of the hoisting mechanism can be achieved.

[0055] In some embodiments, as Figure 1 and Figure 2 As shown, the start control valve 5 includes an explosion-proof valve 52 , which is provided between the accumulator 6 and the first oil circuit 41 and is configured to prevent the hydraulic oil in the first oil circuit 41 from leaking out in the event of failure of the accumulator 6 .

[0056] Specifically, the explosion-proof valve 52 can be provided between the fourth oil port D and the node O. Specifically, in the event of failure of the accumulator 6, including extreme cases such as the accumulator losing its function or falling off, if the explosion-proof valve 52 is not provided, the hydraulic oil between the balancing valve 4 and the hydraulic motor 3 will leak out from the fourth oil port D.

[0057] The explosion-proof valve of this embodiment can prevent the hydraulic oil from leaking out after the accumulator of the hydraulic system fails or falls off, thereby improving the safety of the hydraulic system.

[0058] In some embodiments, as Figure 1 and Figure 2 As shown, the explosion-proof valve 52 includes a two-position two-way valve. When the accumulator 6 is working normally, the two-position two-way valve is in the first position 521 and is configured to connect the accumulator 6 and the first oil circuit 41; when the accumulator 6 fails, the two-position two-way valve is in the second position 522 and is configured to prevent the hydraulic oil in the first oil circuit 41 from leaking.

[0059] Specifically, when the two-position two-way valve is in the second position 522 , hydraulic oil cannot flow out of the fourth oil port D. Specifically, a one-way valve can be provided in the second position 522 to prevent the hydraulic oil in the first oil circuit 41 from leaking when the two-position two-way valve is switched to the second position 522 .

[0060] The two-position, two-way valve of this embodiment switches from the first position to the second position when the accumulator fails, thereby preventing the hydraulic oil in the first oil circuit from leaking out and improving the safety of the hydraulic system.

[0061] In some embodiments, as Figure 1 and Figure 2 As shown, the working oil port of the two-position two-way valve connected to the accumulator 6 leads out the control oil to act on the outer end of the first position 521.

[0062] Specifically, in the event of failure or detachment of the accumulator, the control oil pressure disappears, and the two-position two-way valve automatically switches from the first position 521 to the second position 522 .

[0063] This embodiment drives the two-position two-way valve by hydraulic control. In the event of accumulator failure, the control oil pressure disappears and the two-position two-way valve automatically switches its working position, thereby improving the safety of the hydraulic system.

[0064] In some embodiments, as Figure 1 and Figure 2As shown, the start control valve 5 further includes a first throttle valve 53 , which is provided between the explosion-proof valve 52 and the first oil circuit 41 and is configured to adjust the flow of hydraulic oil flowing from the first oil circuit 41 to the accumulator 6 .

[0065] Specifically, the first throttle valve 53 may be provided between the explosion-proof valve 52 and the node O. Specifically, the first throttle valve 53 is an adjustable throttle valve.

[0066] This embodiment adjusts the flow rate of hydraulic oil from the first oil passage to the accumulator through the first throttle valve, thereby improving the stability and safety of the hydraulic system.

[0067] In some embodiments, as Figure 1 and Figure 2 As shown, the starting control valve 5 further includes a second throttle valve 54 , which is provided on the control oil circuit 51 .

[0068] Specifically, the second throttle valve 54 may be provided between the node O and the third oil port C. Specifically, the second throttle valve 54 is a fixed damping throttle valve for delaying the pressure buildup between the first oil port A and the second oil port B when the control pressure is input to the third oil port C.

[0069] This embodiment provides a second throttle valve in the control oil circuit, so that when the control oil circuit inputs control pressure from the third oil port, the pressure in the first oil circuit is delayed and built up.

[0070] In some embodiments, as Figure 1 and Figure 2 As shown, the start control valve 5 further includes a first one-way valve 55 , which is provided on the control oil circuit 51 and configured to only allow the hydraulic oil to flow from the control oil circuit 51 to the first oil circuit 41 .

[0071] Specifically, the first one-way valve 55 may be disposed between the node O and the third oil port C to control the direction of pressure transmission between the third oil port C and the first oil circuit 41, that is, hydraulic oil can only flow from the third oil port C to the first oil circuit 41. More specifically, the first one-way valve 55 may be disposed between the second throttle valve 54 and the third oil port C.

[0072] This embodiment can control the pressure transmission direction between the control oil circuit and the first oil circuit by providing a first one-way valve on the control oil circuit.

[0073] In some embodiments, as Figure 1 and Figure 2 As shown, the start control valve 5 further includes a pressure measuring joint 56 , which is connected to the first oil circuit 41 and is configured to measure the pressure of the hydraulic oil in the first oil circuit 41 .

[0074] Specifically, the pressure measuring joint 56 is connected to the node O, and the pressure measuring joint 56 can measure the pressure between the first oil port A and the second oil port B. Specifically, the pressure measuring joint 56 can be connected to the node O through a one-way valve to prevent leakage of hydraulic oil.

[0075] The pressure measuring joint of this embodiment can measure the pressure of the hydraulic oil at the first oil circuit, thereby providing data reference for the stable operation of the hydraulic system, which is beneficial to improving the safety of the hydraulic system.

[0076] Secondly, the present disclosure proposes a winch system, comprising:

[0077] reel;

[0078] a wire rope, one end of which is wound on a drum; and

[0079] The hydraulic system of the hoisting mechanism of the above embodiment;

[0080] The hydraulic motor 3 is configured to drive the reel to rotate.

[0081] Specifically, the other end of the wire rope is wound around the load.

[0082] The winch system of this embodiment can eliminate the hydraulic shock at the moment of heavy-load start-up of the winch mechanism through the winch mechanism hydraulic system, so that the winch mechanism can achieve smooth heavy-load start-up during both the lifting and lowering actions; at the same time, the accumulator can also effectively absorb other pressure shocks of the hydraulic system, making the winch mechanism move more smoothly, thereby improving the operator's comfort and improving the safety of the winch system.

[0083] In addition, the present disclosure also proposes an engineering machine, including the hoisting mechanism hydraulic system of the above embodiment or the hoisting system of the above embodiment.

[0084] Optionally, the construction machinery may be a crane or a compactor.

[0085] The hydraulic system of the winch mechanism of the engineering machinery in this embodiment can eliminate the hydraulic shock at the moment of heavy-load start-up of the winch mechanism, so that the winch mechanism can achieve smooth heavy-load start-up during both the lifting and lowering actions; at the same time, it can also effectively absorb other pressure shocks of the hydraulic system, making the winch mechanism move more smoothly, thereby improving the comfort of the operator and the safety of the engineering machinery.

[0086] The above is a detailed introduction to a winch mechanism hydraulic system, a winch system, and engineering machinery provided by the present disclosure. Specific embodiments are used herein to illustrate the principles and implementation methods of the present disclosure. The description of the above embodiments is only intended to help understand the method and core concept of the present disclosure. It should be noted that for ordinary technicians in this technical field, without departing from the principles of the present disclosure, several improvements and modifications can be made to the present disclosure, and these improvements and modifications also fall within the scope of protection of the claims of the present disclosure.

Claims

1. A winch mechanism hydraulic system, characterized in that: include: Hydraulic pump (1); A reversing valve (2) is provided on the oil supply line of the hydraulic pump (1); A hydraulic motor (3) is provided in the working oil circuit of the reversing valve (2) and is configured to provide driving force to the hoisting mechanism. The hydraulic motor (3) has a lifting chamber (31) and a lowering chamber (32); A balancing valve (4) is provided on the working oil circuit between the reversing valve (2) and the lifting chamber (31); A start-up control valve (5) is provided with a control oil circuit (51) therein, wherein the control oil circuit (51) is configured to provide hydraulic oil of a first preset pressure to a first oil circuit (41) between the lifting chamber (31) and the balancing valve (4) during the process of the hoisting mechanism performing a falling action; and an accumulator (6) connected to the first oil circuit (41) via an oil circuit inside the start control valve (5); The starting control valve (5) has a first oil port (A), a second oil port (B), a third oil port (C) and a fourth oil port (D), wherein the first oil port (A) is connected to the lifting chamber (31), the second oil port (B) is connected to the end of the balancing valve (4) away from the reversing valve (2), the third oil port (C) is arranged on the control oil circuit (51), and the fourth oil port (D) is connected to the accumulator (6); the first oil port (A), the second oil port (B), the third oil port (C) and the fourth oil port (D) are all connected to a node (O), and the node (O) is located inside the starting control valve (5).

2. The winch mechanism hydraulic system according to claim 1, characterized in that: The start control valve (5) includes an explosion-proof valve (52), which is provided between the accumulator (6) and the first oil circuit (41) and is configured to prevent the hydraulic oil in the first oil circuit (41) from leaking out in the event of failure of the accumulator (6).

3. The winch mechanism hydraulic system according to claim 2, characterized in that: The explosion-proof valve (52) comprises a two-position two-way valve. When the accumulator (6) is working normally, the two-position two-way valve is in the first position (521) and is configured to connect the accumulator (6) and the first oil circuit (41). When the accumulator (6) fails, the two-position two-way valve is in the second position (522) and is configured to prevent the hydraulic oil in the first oil circuit (41) from leaking out.

4. The winch mechanism hydraulic system according to claim 3, characterized in that: The working oil port of the two-position two-way valve in communication with the accumulator (6) leads out control oil to act on the outer end of the first position (521).

5. The winch mechanism hydraulic system according to claim 2, characterized in that: The start control valve (5) further includes a first throttle valve (53), which is provided between the explosion-proof valve (52) and the first oil circuit (41) and is configured to adjust the flow rate of hydraulic oil flowing from the first oil circuit (41) to the accumulator (6).

6. The winch mechanism hydraulic system according to any one of claims 1 to 5, characterized in that: The startup control valve (5) further includes a second throttle valve (54), and the second throttle valve (54) is provided on the control oil circuit (51).

7. The winch mechanism hydraulic system according to any one of claims 1 to 5, characterized in that: The start control valve (5) further comprises a first one-way valve (55), which is provided on the control oil circuit (51) and is configured to only allow hydraulic oil to flow from the control oil circuit (51) to the first oil circuit (41).

8. The winch mechanism hydraulic system according to any one of claims 1 to 5, characterized in that: The start control valve (5) further comprises a pressure measuring joint (56), wherein the pressure measuring joint (56) is connected to the first oil circuit (41) and is configured to measure the pressure of the hydraulic oil in the first oil circuit (41).

9. A winch system, characterized in that: include: reel; a steel wire rope, one end of which is wound around the drum; and The winch mechanism hydraulic system according to any one of claims 1 to 8; Wherein, the hydraulic motor (3) is configured to drive the reel to rotate.

10. An engineering machine, characterized in that: It comprises the hoisting mechanism hydraulic system according to any one of claims 1 to 8 or the hoisting system according to claim 9.

Images