Crane winch emergency lowering device

Abstract

The invention discloses a crane winch emergency lowering device, which belongs to the technical field of mobile hoisting equipment, and comprises an oil tank, an oil pump, a power source, a winch mechanism, a reversing valve group, a plurality of balance valves and a connector group, the balance valves and the connector sets connected with the balance valves are used for providing external pressure for the hoisting mechanism of the crane to adapt to different types of hoisting equipment of the crane, the connector sets are connected with the branch connector sets, an oil way closed loop is formed between a hoisting oil way and the balance valves, a hoist falls under the gravity effect of heavy objects, and the hoisting equipment is protected. And the oil pump is only used for supplementing oil and providing control pressure, so that rapid lowering is facilitated, plug and play are realized, convenience and rapidness are realized, and the problems of difficulty in rapid lowering of heavy objects due to winch faults of the current crane and large potential safety hazards are solved.

Description

Technical Field

[0001] The invention relates to a crane hoisting emergency lowering device, belonging to the technical field of mobile lifting equipment. Background Art

[0002] Cranes inevitably malfunction during lifting operations, particularly power failures, which can leave the lifted load suspended in mid-air and unable to be safely lowered to the ground, resulting in economic losses and safety hazards. Currently, the main measures to address this situation include: 1) Using another crane to re-set the lifting point in the air and then lower the suspended load to the ground. However, this approach presents significant risks, and the cost of using another crane for emergency response is generally high, which also introduces certain inconveniences to the crane's operation. 2) Using an emergency lowering control device, however, the basic principle of existing emergency lowering control devices is to use a small pump as the power source to drive the winch down, which is extremely slow. Summary of the Invention

[0003] The purpose of the present invention is to overcome the shortcomings of the existing technology and provide a crane winch emergency lowering device. Without changing the internal oil circuit of the crane winch equipment, the device can adapt to different types of crane winches and facilitate rapid lowering, thus solving the problem that the current crane winch failure makes it difficult to quickly lower heavy objects, which poses a great safety hazard.

[0004] In order to solve the above technical problems, the present invention is implemented by adopting the following technical solutions: A crane winch emergency lowering device comprising: tank; an oil pump connected to the oil tank; The hoisting mechanism includes a lifting oil circuit, an oil supply oil circuit, a lowering oil circuit and a hoisting oil circuit; the hoisting oil circuit is provided with a branch interface group for connecting the lifting oil circuit, the oil supply oil circuit and the lowering oil circuit respectively; a power source connected to the oil pump and used to drive the oil pump; The reversing valve group is connected to the oil pump and the oil tank respectively; Multiple balancing valves connected to the reversing valve group; The joint group is connected to the balance valve and the reversing valve group; the joint group is adapted to the branch interface group and is used to form an oil circuit closed loop between the winch oil circuit and the balance valve, so that the winch falls under the action of gravity of the heavy object.

[0005] Furthermore, the reversing valve group includes an oil inlet P, an oil return port I, a relief valve, a reversing valve body, a one-way valve, a first oil outlet A and a second oil outlet B; The oil inlet P is connected to the oil pump, the overflow valve and the reversing valve body respectively; The reversing valve body is connected to the first oil outlet A through a one-way valve, and the first oil outlet A is connected to the balancing valve; The second oil outlet B is connected to the balancing valve and the reversing valve body respectively; The oil return port I is connected to the overflow valve, the reversing valve body and the oil tank respectively.

[0006] Furthermore, the branch interface group includes a first branch interface connected to the lifting oil circuit, a second branch interface connected to the oil replenishment oil circuit, and a third branch interface connected to the lowering oil circuit; The connector group includes a first connector and a second connector; wherein the first connector is adapted to the first branch interface, and the second connector is adapted to the second branch interface.

[0007] Furthermore, the balancing valve includes a first balancing valve body; the first balancing valve body is connected to the first connector and the second connector respectively.

[0008] Furthermore, the balancing valve also includes a second balancing valve body and a throttle valve for adjusting the flow rate of the hydraulic oil; the throttle valve is connected to the second balancing valve body and the first connector respectively, and the second balancing valve body is connected to the second connector.

[0009] Furthermore, the hoisting oil circuit includes a motor and an intermediate valve group; The motor is provided with an oil port A, an oil port B and an oil return port C; the oil port A is connected to the intermediate valve group, and the intermediate valve group is connected to the first branch interface and the oil port B; when the first branch interface is connected to the first joint, an external lifting oil circuit of the motor is formed at the oil port A; The oil return port C is connected to the oil tank; The oil port B is connected to the second branch interface; when the second branch interface is connected to the second connector, an external oil supply circuit for the motor is formed at the oil port B.

[0010] Furthermore, the intermediate valve group includes a winch balancing valve or an explosion-proof pipe valve.

[0011] Furthermore, the hoisting mechanism further includes a solenoid valve and a brake; The solenoid valve is connected to the oil port B, the oil return port C, and the brake respectively; The brake is provided on the motor and is used to decelerate the motor.

[0012] Compared with the prior art, the present invention has the following beneficial effects: 1. The present invention provides external pressure for the crane hoist mechanism by utilizing multiple balancing valves and a joint group connected thereto, adapting to different types of hoisting equipment of the crane. The joint group is connected to the branch interface group to form an oil circuit closed loop between the hoist oil circuit and the balancing valve, so that the hoist falls under the action of the gravity of the heavy object. The oil pump is only used for replenishing oil and providing control pressure, which facilitates rapid lowering. The plug-and-play design is convenient and quick, solving the current problem of crane winch failure that makes it difficult to quickly lower heavy objects and poses a great safety hazard.

[0013] 2. The present invention connects a throttle valve to the balance valve, and can adjust the size of the throttle opening of the throttle valve during the falling process of the heavy object to make the falling speed of the two winches of the crane consistent, thereby ensuring the synchronous lowering of the heavy object. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a structural schematic diagram of a crane winch emergency lowering device provided in Example 1 of the present invention; Figure 2 It is a structural schematic diagram of a crane winch emergency lowering device provided in Example 2 of the present invention.

[0015] In the figure: 1. Oil tank; 2. Oil pump; 3. Power source; 4. Winch mechanism; 401. Motor; 4011. Oil port A; 4012. Oil port B; 4013. Oil return port C; 402. Intermediate valve group; 403. Solenoid valve; 404. Brake; 5. Reversing valve group; 501. Oil port P; 502. Oil return port I; 503. Overflow valve; 504. Reversing valve body; 505. Check valve; 506. First oil outlet A; 507. Second oil outlet B; 601. First balancing valve body; 602. Second balancing valve body; 603. Throttle valve; 701. First connector; 702. Second connector; 801. First branch interface; 802. Second branch interface; 803. Third branch interface; 9. Motor check valve. DETAILED DESCRIPTION

[0016] The present invention will be further described below in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solutions of the present invention and are not intended to limit the scope of protection of the present invention.

[0017] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, features defined as "first", "second", etc. may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0018] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances. Example

[0019] like Figure 1 As shown, a crane winch emergency lowering device includes an oil tank 1, an oil pump 2, a power source 3, a winch mechanism 4, a reversing valve group 5, multiple balancing valves and a joint group; Among them, the oil pump 2 is connected to the oil tank 1, the oil tank 1 is used to provide hydraulic oil, and the output end of the power source 3 is connected to the oil pump 2 for providing power; in this embodiment, the power source 3 is an engine, and the oil tank 1 is a crane-mounted oil tank 1.

[0020] The reversing valve group 5 is connected to the oil pump 2 and the oil tank 1 respectively. Specifically: The reversing valve group 5 includes an oil inlet P501, an oil return port I502, a relief valve 503, a reversing valve body 504, a one-way valve 505, a first oil outlet A506 and a second oil outlet B507; the oil inlet P501 is connected to the oil pump 2, the relief valve 503 and the reversing valve body 504 respectively; the reversing valve body 504 is connected to the first oil outlet A506 through the one-way valve 505, and the first oil outlet A506 is connected to the balancing valve; the second oil outlet B507 is connected to the balancing valve and the reversing valve body 504 respectively; the oil return port I502 is connected to the relief valve 503, the reversing valve body 504 and the oil tank 1 respectively.

[0021] The hoisting mechanism 4 includes a lifting oil circuit (not shown), an oil replenishing oil circuit (not shown), a lowering oil circuit (not shown), and a hoisting oil circuit. The hoisting oil circuit is provided with a branch interface group for connecting the lifting oil circuit, the oil replenishing oil circuit, and the lowering oil circuit respectively; multiple balancing valves are connected to the reversing valve group 5, and a joint group is connected to the balancing valves and the reversing valve group 5; wherein the joint group is adapted to the branch interface group to form an oil circuit closed loop between the hoisting oil circuit and the balancing valve, so that the hoist falls under the action of gravity of the heavy object. Specifically: In this embodiment, the crane is a single winch type, so the number of the winch mechanism 4 is one, and the number of the balancing valve is also one; The branch interface group includes a first branch interface 801 connected to the lifting oil circuit, a second branch interface 802 connected to the oil replenishment oil circuit, and a third branch interface 803 connected to the lowering oil circuit; the joint group includes a first joint 701 and a second joint 702; the first joint 701 is adapted to the first branch interface 801, and the second joint 702 is adapted to the second branch interface 802; Before use, the first branch interface 801, the second branch interface 802 and the third branch interface 803 must be disconnected from the lifting oil circuit, the oil replenishing oil circuit and the falling oil circuit respectively, and then the first branch interface 801 must be connected to the first connector 701 and the second branch interface 802 must be connected to the second connector 702 respectively.

[0022] The balancing valve includes a first balancing valve body 601 ; the first balancing valve body 601 is connected to a first connector 701 and a second connector 702 ; The hoisting oil circuit includes a motor 401 and an intermediate valve group 402, wherein the intermediate valve group 402 includes a hoisting balance valve or an explosion-proof pipe valve; It should be noted that crane winches are divided into open system winches and closed system winches. In the open system winch, the intermediate valve group 402 uses a winch balancing valve, while in the closed system winch, the intermediate valve group 402 uses an explosion-proof pipe valve. In this embodiment, the crane winch is an open system winch. Motor 401 is provided with oil port A4011, oil port B4012, and oil return port C4013; oil port A4011 is connected to intermediate valve assembly 402, which is connected to first branch interface 801 and oil port B4012; when first branch interface 801 is connected to first connector 701, an external lifting oil circuit for motor 401 is formed at oil port A4011; The oil return port C4013 is connected to the oil tank 1; The oil port B4012 is connected to the second branch interface 802; when the second branch interface 802 is connected to the second connector 702, an external oil supply circuit for the motor 401 is formed at the oil port B4012; The hoisting mechanism 4 also includes a solenoid valve 403 and a brake 404; the solenoid valve 403 is respectively connected to the oil port B4012, the return oil port C4013, and the brake 404, and the brake 404 is installed at the power output end of the motor 401 to slow down the motor 401.

[0023] A motor one-way valve 9 is also installed at the connection between the oil port B4012 and the second branch interface 802, the intermediate valve group 402 and the solenoid valve 403, so as to allow the pressure oil to gather at the oil port B4012. Example

[0024] like Figure 2 As shown, a crane winch emergency lowering device includes an oil tank 1, an oil pump 2, a power source 3, a winch mechanism 4, a reversing valve group 5, multiple balancing valves and a joint group; Among them, the oil pump 2 is connected to the oil tank 1, the oil tank 1 is used to provide hydraulic oil, and the output end of the power source 3 is connected to the oil pump 2 for providing power; in this embodiment, the power source 3 is an engine, and the oil tank 1 is a crane-mounted oil tank 1.

[0025] The reversing valve group 5 is connected to the oil pump 2 and the oil tank 1 respectively. Specifically: The reversing valve group 5 includes an oil inlet P501, an oil return port I502, a relief valve 503, a reversing valve body 504, a one-way valve 505, a first oil outlet A506 and a second oil outlet B507; the oil inlet P501 is connected to the oil pump 2, the relief valve 503 and the reversing valve body 504 respectively; the reversing valve body 504 is connected to the first oil outlet A506 through the one-way valve 505, and the first oil outlet A506 is connected to the balancing valve; the second oil outlet B507 is connected to the balancing valve and the reversing valve body 504 respectively; the oil return port I502 is connected to the relief valve 503, the reversing valve body 504 and the oil tank 1 respectively.

[0026] The hoisting mechanism 4 includes a lifting oil circuit (not shown), an oil replenishing oil circuit (not shown), a lowering oil circuit (not shown), and a hoisting oil circuit. The hoisting oil circuit is provided with a branch interface group for connecting the lifting oil circuit, the oil replenishing oil circuit, and the lowering oil circuit respectively; multiple balancing valves are connected to the reversing valve group 5, and a joint group is connected to the balancing valves and the reversing valve group 5; wherein the joint group is adapted to the branch interface group to form an oil circuit closed loop between the hoisting oil circuit and the balancing valve, so that the hoist falls under the action of gravity of the heavy object. Specifically: In this embodiment, the crane is a double winch type, so the number of winch mechanisms 4 is two, and the number of balancing valves is also two; Take one of the winch mechanisms 4 as an example: The branch interface group includes a first branch interface 801 connected to the lifting oil circuit, a second branch interface 802 connected to the oil replenishment oil circuit, and a third branch interface 803 connected to the lowering oil circuit; the joint group includes a first joint 701 and a second joint 702; the first joint 701 is adapted to the first branch interface 801, and the second joint 702 is adapted to the second branch interface 802; Before use, the first branch interface 801, the second branch interface 802 and the third branch interface 803 need to be disconnected from the lifting oil circuit, the oil supply oil circuit and the falling oil circuit respectively, and then the first branch interface 801 is connected to the first connector 701, and the second branch interface 802 is connected to the second connector 702 respectively. Since the crane winch in this embodiment is a double winch, the remaining branch interface groups and connector groups are disconnected and reconnected in the above manner.

[0027] The balancing valve includes a second balancing valve body 602 and a throttle valve 603; The throttle valve 603 is connected to the second balancing valve body 602 and the first connector 701 respectively, and the second balancing valve body 602 is connected to the second connector 702; The hoisting oil circuit includes a motor 401 and an intermediate valve group 402, wherein the intermediate valve group 402 includes a hoisting balance valve or an explosion-proof pipe valve; It should be noted that crane winches are divided into open system winches and closed system winches; In the open system winch, the intermediate valve group 402 uses a winch balancing valve; For closed system winches, the intermediate valve group 402 uses an explosion-proof pipe valve; in this embodiment, the crane winch is an open system winch; Motor 401 is provided with oil port A4011, oil port B4012, and oil return port C4013; oil port A4011 is connected to intermediate valve assembly 402, which is connected to first branch interface 801 and oil port B4012; when first branch interface 801 is connected to first connector 701, an external lifting oil circuit for motor 401 is formed at oil port A4011; The oil return port C4013 is connected to the oil tank 1; The oil port B4012 is connected to the second branch interface 802; when the second branch interface 802 is connected to the second connector 702, an external oil supply circuit for the motor 401 is formed at the oil port B4012; The hoisting mechanism 4 also includes a solenoid valve 403 and a brake 404; the solenoid valve 403 is respectively connected to the oil port B4012, the return oil port C4013, and the brake 404, and the brake 404 is installed at the power output end of the motor 401 to slow down the motor 401.

[0028] A motor one-way valve 9 is also installed at the connection between the oil port B4012 and the second branch interface 802, the intermediate valve group 402 and the solenoid valve 403, so as to allow the pressure oil to gather at the oil port B4012.

[0029] How it works Start the power source 3, the oil pump 2 outputs pressurized oil, the overflow valve 503 works according to the preset pressure, and the reversing valve body 504 is opened to allow the pressurized oil to enter the intermediate valve group 402 through the connection between the first interface and the first branch interface 801. Taking the intermediate valve group 402 as a winch balance valve or a double winch as an example, the pressurized oil passes through the pilot chamber of the intermediate valve group 402 and gathers at the oil port B4012. At the same time, the pressurized oil enters the motor 401 through the control chamber of the intermediate valve group 402; the solenoid valve 403 is turned on, and the pressurized oil flowing out of the return oil port C4013 passes through the solenoid valve 403 and enters the brake 404. The crane winch rotates in the downward direction under the gravity of the weight. At this time, the motor 401 changes to a pumping mode under the action of the reducer and gravity-driven passive rotation; Motor 401 draws oil from oil port B4012, and then pressurizes the pressure oil out from oil port A4011. The pressed pressure oil returns to oil port B4012 through the oil circuit closed loop formed by the first branch interface 801, the first connector 701, the throttle valve 603, the second balancing valve, the second connector 702, and the second branch interface 802, thereby controlling the fall of the heavy object.

[0030] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A crane winch emergency lowering device, characterized in that: include: Fuel tank (1); An oil pump (2) connected to the oil tank (1); The hoisting mechanism (4) comprises a lifting oil circuit, an oil supply oil circuit, a lowering oil circuit and a hoisting oil circuit; the hoisting oil circuit is provided with a branch interface group for respectively connecting the lifting oil circuit, the oil supply oil circuit and the lowering oil circuit; a power source (3), connected to the oil pump (2) and used to drive the oil pump (2); The reversing valve group (5) is connected to the oil pump (2) and the oil tank (1) respectively; A plurality of balancing valves connected to the reversing valve group (5); The joint group is connected to the balance valve and the reversing valve group (5); the joint group is adapted to the branch interface group and is used to form an oil circuit closed loop between the winch oil circuit and the balance valve, so that the winch falls under the action of the gravity of the heavy object.

2. The crane hoisting emergency lowering device according to claim 1, characterized in that: The reversing valve assembly (5) comprises an oil inlet P (501), an oil return port I (502), a relief valve (503), a reversing valve body (504), a one-way valve (505), a first oil outlet A (506) and a second oil outlet B (507); The oil inlet P (501) is connected to the oil pump (2), the overflow valve (503) and the reversing valve body (504) respectively; The reversing valve body (504) is connected to the first oil outlet A (506) via a one-way valve (505), and the first oil outlet A (506) is connected to the balancing valve; The second oil outlet B (507) is connected to the balancing valve and the reversing valve body (504) respectively; The oil return port I (502) is respectively connected to the overflow valve (503), the reversing valve body (504) and the oil tank (1).

3. The crane hoisting emergency lowering device according to claim 1, characterized in that: The branch interface group comprises a first branch interface (801) connected to the lifting oil circuit, a second branch interface (802) connected to the oil replenishment oil circuit, and a third branch interface (803) connected to the lowering oil circuit; The connector group comprises a first connector (701) and a second connector (702); wherein the first connector (701) is adapted to the first branch interface (801), and the second connector (702) is adapted to the second branch interface (802).

4. The crane hoisting emergency lowering device according to claim 3, characterized in that: The balancing valve comprises a first balancing valve body (601); the first balancing valve body (601) is connected to a first connector (701) and a second connector (702) respectively.

5. The crane hoisting emergency lowering device according to claim 3, characterized in that: The balancing valve further comprises a second balancing valve body (602) and a throttle valve (603) for adjusting the flow rate of the hydraulic oil; the throttle valve (603) is respectively connected to the second balancing valve body (602) and the first connector (701), and the second balancing valve body (602) is connected to the second connector (702).

6. The crane hoisting emergency lowering device according to claim 3, characterized in that: The hoisting oil circuit includes a motor (401) and an intermediate valve group (402); The motor (401) is provided with an oil port A (4011), an oil port B (4012) and an oil return port C (4013); the oil port A (4011) is connected to the intermediate valve group (402), and the intermediate valve group (402) is connected to the first branch interface (801) and the oil port B (4012); when the first branch interface (801) is connected to the first joint (701), an external lifting oil circuit of the motor (401) is formed at the oil port A (4011); The oil port B (4012) is connected to the second branch interface (802); when the second branch interface (802) is connected to the second connector (702), an external oil supply circuit for the motor (401) is formed at the oil port B (4012).

7. The crane hoisting emergency lowering device according to claim 6, characterized in that: The intermediate valve group (402) includes a winch balancing valve or an explosion-proof pipe valve.

8. The crane hoisting emergency lowering device according to claim 6, characterized in that: The hoisting mechanism (4) further includes a solenoid valve (403) and a brake (404); The solenoid valve (403) is respectively connected to the oil port B (4012), the oil return port C (4013), and the brake (404); The oil return port C (4013) is connected to the oil tank (1); The brake (404) is provided on the motor (401) and is used to decelerate the motor (401).

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