A gas supply system for an automatic unhooking spreader

Abstract

A kind of gas supply system for automatic unhooking spreader, including multiple gas supply cylinders mounted on hanger, multiple the gas supply cylinders are connected together by first three-way valve in series, the gas supply cylinder at the end is sequentially connected with multiple pneumatic switch after high-pressure pressure reducing valve, safety valve, pneumatic two-pairs and solenoid valve, each the pneumatic switch is opened or closed to control one hook;Second three-way valve is connected between the gas supply cylinder at the end and high-pressure pressure reducing valve, the second three-way valve is connected with inflation connector by gate valve, when needing to inflate, the inflation connector is connected by high-pressure compressor containing compressed air, and multiple the gas supply cylinders are inflated.The utility model does not need to change gas supply cylinder, to improve efficiency, reduce the security risk of operator, air source is replaced nitrogen gas source simultaneously, to save cost;In addition, the gas circuit is pressure maintained by energy storage pressure maintaining cylinder, to avoid that part hook cannot be opened automatically.

Description

Technical Field

[0001] This utility model relates to the field of hoisting operation technology, specifically to an air supply system for an automatic unhooking hoist. Background Technology

[0002] Existing automatic unhooking lifting devices use multiple nitrogen cylinders mounted on the lifting frame as a gas source to achieve automatic unhooking. In the gas supply system, multiple nitrogen cylinders are connected in parallel and take turns supplying gas. When the nitrogen is almost depleted, it will lead to insufficient gas pressure, and some hooks will be unable to be unhooked. Manual replacement of the gas requires manual climbing onto the roof of the vehicle, which reduces work efficiency and poses a great safety hazard to the operator. At the same time, using nitrogen as a gas source is costly. Utility Model Content

[0003] Based on this, the purpose of this utility model is to provide an air supply system for an automatic unhooking lifting device, which uses compressed air as the air source, does not require disassembling the air cylinder, and can directly replenish air during idle time, thereby improving efficiency and saving costs.

[0004] An air supply system for an automatic unhooking lifting device includes multiple air cylinders installed on a lifting frame. The multiple air cylinders are connected in series via a first three-way valve. The air cylinder at the end is connected to multiple pneumatic switches after passing through a high-pressure reducing valve, a safety valve, a pneumatic double-acting unit, and a solenoid valve in sequence. Each pneumatic switch controls the opening or closing of a lifting hook.

[0005] A second three-way valve is connected between the gas supply cylinder and the high-pressure pressure reducing valve at the end. The second three-way valve is connected to the inflation connector through a gate valve. When inflation is required, the inflation connector is connected through a high-pressure compressor containing compressed air, and the gate valve is opened to inflate multiple gas supply cylinders.

[0006] Preferably, a third three-way valve is connected between the high-pressure reducing valve and the safety valve, and the third three-way valve is connected to the energy storage and pressure-maintaining gas cylinder.

[0007] Preferably, the energy storage and pressure-maintaining gas cylinder and the gas supply cylinder have the same structure and capacity.

[0008] Preferably, the pressure inside the high-pressure compressor is not less than 30 MPa, and the pressure inside the gas supply cylinder is 10~12 MPa.

[0009] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0010] During off-peak hours, the gas cylinders are replenished by a high-pressure compressor, eliminating the need to replace them, thus improving efficiency and reducing safety hazards for operators. Additionally, air is used instead of nitrogen, saving costs.

[0011] When the high-pressure reducing valve is opened, the air pressure in the air circuit drops sharply and instantaneously. The air circuit is pressure maintained by the energy storage and pressure-maintaining gas cylinder to prevent some hooks from failing to open automatically. Attached Figure Description

[0012] Figure 1 This is the front view of the hanger of this utility model;

[0013] Figure 2 This is a top view of the hanger of this utility model;

[0014] Figure 3 This is a pneumatic schematic diagram of the air supply system of this utility model.

[0015] Explanation of key component symbols:

[0016] 11-Hanger; 12-Gas cylinder; 13-First three-way valve; 14-High pressure reducing valve; 15-Safety valve; 16-Pneumatic dual unit; 17-Solenoid valve; 18-Hook; 19-Second three-way valve; 20-Gate valve; 21-Inflation connector; 22-High pressure compressor; 23-Third three-way valve; 24-Storage and pressure-maintaining gas cylinder.

[0017] The following detailed description, in conjunction with the accompanying drawings, will further illustrate this utility model. Detailed Implementation

[0018] The following description is intended to disclose the present invention so that those skilled in the art can implement it. The preferred embodiments described below are merely examples, and other obvious variations will occur to those skilled in the art.

[0019] Please see Figures 1 to 3 An embodiment of this utility model provides an air supply system for an automatic unhooking lifting device, including multiple air supply cylinders 12 installed on a lifting frame 11. The multiple air supply cylinders 12 are connected in series through a first three-way valve 13. The air supply cylinder 12 at the end (with an internal pressure of 12MPa) passes sequentially through a high-pressure reducing valve 14 (reducing the internal pressure from 12MPa to about 0.8MPa), a safety valve 15, a pneumatic dual unit 16, and a solenoid valve 17, and is then connected to multiple pneumatic switches. Each pneumatic switch controls the opening or closing of a lifting hook 18.

[0020] A second three-way valve 19 is connected between the gas supply cylinder 12 at the end and the high-pressure reducing valve 14. The second three-way valve 19 is connected to the inflation connector 21 through the gate valve 20. When inflation is required, the inflation connector 21 is connected through the high-pressure compressor 22 containing compressed air, and the gate valve 20 is opened to inflate the multiple gas supply cylinders 12.

[0021] It should be noted that in this invention, since the gas supply cylinder 12 has a very high pressure (1-12 MPa) when it exits, the gas pressure is reduced to 0.8 MPa by the high-pressure reducing valve 14. The safety valve 15 prevents excessive pressure in the gas pipe and can automatically release pressure when it becomes too high, such as by setting the pressure to 1.0 MPa to prevent damage to the pneumatic coupling 16. The pneumatic coupling 16 reduces the pressure to the required 0.3-0.5 MPa for hook opening, performs oil-water separation of the gas, and lubricates the cylinder with oil mist. Multiple pneumatic switches are controlled by the solenoid valve 17, thereby controlling the opening and closing of all hooks 18. During idle periods, the high-pressure compressor 22 replenishes the gas supply cylinder 12. After it is full, the gate valve 20 is closed, and the connecting pipe of the high-pressure compressor 22 is disconnected. The entire process does not require replacing the gas supply cylinder 12, thus improving efficiency. Furthermore, an air source is used instead of a nitrogen source (the hook opening cylinder only requires 0.4 MPa compressed air), thereby saving costs.

[0022] Please see Figure 2 and Figure 3 In one embodiment of this utility model, a third three-way valve 23 is connected between the high-pressure reducing valve 14 and the safety valve 15, and the third three-way valve 23 is connected to the energy storage and pressure-maintaining gas cylinder 24.

[0023] It should be noted that when the high-pressure reducing valve 14 is opened, due to the activation and release of air by multiple pneumatic switches, the insufficient flow from the high-pressure reducing valve 14 will cause a sudden and significant drop in air pressure between the high-pressure reducing valve 14 and the solenoid valve 17. At this time, the energy storage and pressure-maintaining cylinder 24 can replenish the air pressure in the air circuit, that is, maintain the pressure of the air circuit through the energy storage and pressure-maintaining cylinder 24 to prevent some hooks 18 from failing to open automatically due to insufficient air pressure. After the high-pressure reducing valve 14 is opened, the high-pressure gas on the left side of the high-pressure reducing valve 14 enters and replenishes the gas in the energy storage and pressure-maintaining cylinder 24, so that the air pressure in the energy storage and pressure-maintaining cylinder 24 reaches the initial state.

[0024] In one embodiment of this utility model, the energy storage and pressure-maintaining gas cylinder 24 and the gas supply cylinder 12 have the same structure and capacity to facilitate installation.

[0025] In one embodiment of this utility model, the pressure inside the high-pressure compressor 22 is not less than 30 MPa, and the pressure inside the gas supply cylinder 12 is 10~12 MPa, so as to maintain sufficient pressure for easy use.

[0026] In summary, in this utility model, during idle periods, the high-pressure compressor 22 replenishes the gas supply cylinder 12, eliminating the need to replace the gas supply cylinder 12, thereby improving efficiency and reducing safety hazards for operators. At the same time, the use of an air source instead of a nitrogen source saves costs.

[0027] When the high-pressure reducing valve 14 is opened, the air pressure in the air circuit drops sharply and instantaneously. The air circuit is pressure maintained by the energy storage and pressure-maintaining gas cylinder 24 to prevent some hooks 18 from failing to open automatically.

[0028] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. An air supply system for an automatic unhooking lifting device, characterized in that, It includes multiple gas cylinders installed on the hanger, and the multiple gas cylinders are connected in series through a first three-way valve. The gas cylinder at the end is connected to multiple pneumatic switches after passing through a high-pressure reducing valve, a safety valve, a pneumatic double unit and a solenoid valve in sequence. Each pneumatic switch controls the opening or closing of a hanger. A second three-way valve is connected between the gas supply cylinder and the high-pressure pressure reducing valve at the end. The second three-way valve is connected to the inflation connector through a gate valve. When inflation is required, the inflation connector is connected through a high-pressure compressor containing compressed air, and the gate valve is opened to inflate multiple gas supply cylinders.

2. The air supply system for an automatic unhooking lifting device according to claim 1, characterized in that, A third three-way valve is connected between the high-pressure reducing valve and the safety valve, and the third three-way valve is connected to the energy storage and pressure-maintaining gas cylinder.

3. The air supply system for an automatic unhooking lifting device according to claim 2, characterized in that, The energy storage and pressure-maintaining gas cylinder and the gas supply cylinder have the same structure and capacity.

4. The air supply system for an automatic unhooking lifting device according to claim 1, characterized in that, The pressure inside the high-pressure compressor is not less than 30 MPa, and the pressure inside the gas supply cylinder is 10~12 MPa.

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