Dynamic braking system for rotation of offshore platform crane

Abstract

The utility model discloses a rotary dynamic brake system of an offshore platform crane. A normally open rotary brake device, a pressure reducing valve, a pedal control mechanism, an adjustable flow valve, a shuttle valve and a manual drawing mechanism are arranged in a loop of the brake system. The normally-open type rotary brake device is connected with the platform crane and comprises a hydraulic control pump, and the brake system further comprises a redundant safety loop connected with the hydraulic control pump and the redundant safety loop. According to the braking system, a normally-open type rotary braking device is used for replacing a normally-closed type rotary braking device, multi-path matched braking is achieved through the path with the pedal control mechanism and the redundant safety loop and the normally-open type rotary braking device, stable pressure supply is guaranteed, and collaboration and stability of rotary braking are guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of cranes, in particular to a rotary dynamic brake system for an offshore platform crane. Background Art

[0002] Due to the special working environment at sea, unfavorable factors such as ocean currents, wind, ship rotation, ship swaying and limited working space have brought severe challenges to offshore lifting operations. Therefore, offshore platform cranes are generally equipped with a slewing brake system to control the operation of the crane. During operation, the operator needs to perform slewing operation control according to the lifting requirements and environmental conditions to ensure the safety and smooth progress of the lifting operation.

[0003] However, most existing offshore platform cranes use normally closed slewing brake devices, and the oil pump oil circuit is controlled by a single one-handed operation, resulting in insufficient pressure and poor coordination. Multiple pressurization is required to achieve slewing braking, which makes manual operation of the brake inconvenient. Moreover, the control accuracy of the slewing brake by a single operation is insufficient, which can easily lead to excessive rotation or reverse braking. In addition, when the operator is nervous or fatigued, it is easy to operate too hastily, resulting in large hoisting shakes and unstable parking, which increases the risk of hoisting operations. Utility Model Content

[0004] The technical problem to be solved by the utility model is to provide a rotary dynamic brake system for an offshore platform crane.

[0005] The technical solution adopted by the utility model to solve its technical problems is: constructing a rotary dynamic brake braking system for an offshore platform crane, the braking system comprising a normally open rotary brake device, a pressure reducing valve, a foot control mechanism, an adjustable flow valve, a shuttle valve and a manual pulling mechanism; the normally open rotary brake device is connected to the platform crane, and the normally open rotary brake device comprises a hydraulic control pump; the hydraulic control pump is connected to the pressure reducing valve, the pressure reducing valve is connected to the foot control mechanism, the foot control mechanism is connected to the adjustable flow valve, the adjustable flow valve is connected to the manual pulling mechanism through the shuttle valve, and the foot control mechanism and the pressure reducing valve are both connected to the return oil tank of the platform crane; the braking system also comprises a redundant safety circuit, the redundant safety circuit comprises a redundant safety valve, and the redundant safety valve is respectively connected to the normally open rotary brake device, the shuttle valve and the return oil tank.

[0006] Preferably, the foot control mechanism comprises a foot switch, a foot proportional control valve and a push rod; the foot proportional control valve is connected to the foot switch via the push rod.

[0007] Preferably, the T port of the redundant safety valve is connected to the return oil tank, and the 6 port of the redundant safety valve is respectively connected to the normally open rotary brake device and the K port of the shuttle valve; the B port of the shuttle valve is connected to the manual pulling mechanism, and the A port of the shuttle valve is connected to the 5 port of the adjustable flow valve; the 4 port of the adjustable flow valve is connected to the A port of the foot-operated proportional control valve; the T port of the foot-operated proportional control valve is connected to the return oil tank, and the P port of the foot-operated proportional control valve is connected to the 1 port of the pressure reducing valve; the 2 port of the pressure reducing valve is connected to the P port of the hydraulic control pump of the normally open rotary brake device, the hydraulic control pump is connected to the return oil tank, and the 3 port of the pressure reducing valve is connected to the return oil tank.

[0008] Preferably, a pressure gauge is provided at the connection between the normally open slewing brake device and the redundant safety valve.

[0009] Preferably, the platform crane is also provided with a cab, in which a driving seat, a control box and a control panel are provided; the control box and the control panel are arranged in front of the driving seat, and the control box is connected to the control panel; the control box is respectively connected to the normally open slewing brake device, the manual pulling mechanism, the redundant safety valve, the shuttle valve, the adjustable flow valve, the manual pulling mechanism, the foot control mechanism and the pressure reducing valve.

[0010] Preferably, the redundant safety valve is arranged in the control box.

[0011] Preferably, the shuttle valve is arranged in a control box of the cab.

[0012] Preferably, the adjustable flow valve is arranged on one side of the control panel.

[0013] Preferably, the manual pulling mechanism and the foot control mechanism are arranged in front of the driving seat.

[0014] Preferably, the pressure reducing valve is arranged at an outlet position of the hydraulic control pump of the foot control mechanism.

[0015] The implementation of the utility model has the following beneficial effects: the braking system of the utility model uses a normally open rotary brake device instead of a normally closed rotary brake device, and realizes multi-path coordinated braking with the normally open rotary brake device through a path with a foot control mechanism and a redundant safety circuit, thereby ensuring stable pressure supply and ensuring the coordination and stability of the rotary brake.

[0016] The utility model can accurately control the rotation speed through the pedal control mechanism, and can also accurately adjust the delay time of the brake through the adjustable flow valve.

[0017] The utility model can automatically activate when the brake fails through a redundant safety circuit, provide safe pressure for the brake system, and ensure the safety of braking. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solution of the utility model, the utility model will be further described below in conjunction with the accompanying drawings and embodiments. It should be understood that the following drawings only show certain embodiments of the utility model, and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without creative work. In the drawings:

[0019] Figure 1 It is a circuit diagram of the braking system of the utility model;

[0020] Figure 2 It is a schematic diagram of the pressure reducing valve of the utility model;

[0021] Figure 3 It is a schematic diagram of a pedal proportional control valve of the utility model;

[0022] Figure 4 It is a schematic diagram of the shuttle valve of the utility model;

[0023] Figure 5 It is a schematic diagram of the redundant safety valve of the utility model.

[0024] Explanation of the reference numerals in the accompanying drawings: 1-normally open slewing brake device; 2-pressure reducing valve; 3-foot proportional control valve; 4-adjustable flow valve; 5-shuttle valve; 6-manual pulling mechanism; 11-hydraulic control pump; 7-redundant safety valve; 8-return oil tank; 9-pressure gauge. DETAILED DESCRIPTION

[0025] In order to have a clearer understanding of the technical features, purposes and effects of the present invention, the specific implementation methods of the present invention are now described in detail with reference to the accompanying drawings. In the following description, it should be understood that the directions or positional relationships indicated by "front", "rear", "upper", "lower", "inner", "outer", etc. are based on the directions or positional relationships shown in the accompanying drawings, are constructed and operated in specific directions, and are only for the convenience of describing the present technical solution, rather than indicating that the device or element referred to must have a specific direction, and therefore cannot be understood as a limitation on the present invention.

[0026] It should also be noted that, unless otherwise clearly specified and limited, the terms such as "installation", "connection", "setting" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. When an element is referred to as being "on" or "under" another element, the element can be "directly" or "indirectly" located on the other element, or there may be one or more intermediate elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to the specific circumstances.

[0027] In the following description, specific details such as specific system structures and technologies are provided for the purpose of illustration rather than limitation, so as to provide a thorough understanding of the embodiments of the present invention. However, it should be clear to those skilled in the art that the present invention can also be implemented in other embodiments without these specific details. In other cases, detailed descriptions of well-known systems, devices, circuits, and methods are omitted to avoid unnecessary details that hinder the description of the present invention.

[0028] Embodiment 1:

[0029] See also Figure 1-Figure 5 The utility model shows a rotary dynamic brake system for an offshore platform crane, the brake system includes a normally open rotary brake device 1, a pressure reducing valve 2, a pedal control mechanism, an adjustable flow valve 4, a shuttle valve 5 and a manual pulling mechanism 6; the normally open rotary brake device 1 is connected to the platform crane, and the normally open rotary brake device 1 includes a hydraulic control pump 11; the hydraulic control pump 11 is connected to the pressure reducing valve 2, the pressure reducing valve 2 is connected to the pedal control mechanism, the pedal control mechanism is connected to the adjustable flow valve 4, the adjustable flow valve 4 is connected to the manual pulling mechanism 6 through the shuttle valve 5, and the pedal control mechanism and the pressure reducing valve 2 are both connected to the return oil tank 8 of the platform crane; the brake system also includes a redundant safety circuit, the redundant safety circuit includes a redundant safety valve 7, and the redundant safety valve 7 is respectively connected to the normally open rotary brake device 1, the shuttle valve 5 and the return oil tank 8.

[0030] Among them, the rotary dynamic brake is a type of rotary brake. The operator controls the torque generated by the speed and the distance from the center of the operation according to the braking required during the rotary sliding. The operation is simple, fast and practical. The normally open rotary brake device 1 is provided with a disc and a piston structure. The disc is connected to the piston structure. The disc uses pressure to push the friction force to achieve braking on the piston structure. The greater the pressure, the greater the friction force, and the tighter the brake becomes. The disc includes a rotor disc and a stator disc. When the brake disc spring force is greater than the control pressure, the rotation is in a free rotation state; when the control pressure is greater than the brake spring force, the rotor disc and the stator disc brake as the friction increases. The normally open rotary brake device 1 in this application can use existing technology, which will not be described here.

[0031] Among them, the pressure reducing valve 2 is used to control the hydraulic pressure entering the pedal control mechanism, so as to set the maximum pressure of the brake system, and achieve stable pressure output through its own pressure stabilizing performance, ensuring that the pressure parameters required by the brake function are met, and can achieve precise control of the hydraulic oil flow by adjusting the movement of the valve core of the pressure reducing valve 2, thereby ensuring the normal operation of the brake function. In addition, when the pressure in the pipeline drops to the set threshold, the pressure reducing valve 2 will automatically close to keep the pipeline pressure within the normal range, thereby protecting the safe operation of the pipeline equipment and system. In this embodiment, preferably, the pressure reducing valve 2 can use a direct-acting pressure reducing valve.

[0032] Among them, the pedal control mechanism is used to accurately control the speed of the rotary brake. Specifically, the piston structure provided in the normally open rotary brake device 1 can be pushed by hydraulic pressure, and the stroke of the piston structure can be controlled to achieve dynamic rotary brake and control the speed of the rotary slide. The pedal control mechanism cooperates with other mechanisms to work, with good synergy and strong mechanical stability. Further, in this embodiment, the pedal control mechanism includes a foot switch, a foot proportional control valve 3 and a push rod; the foot proportional control valve 3 is connected to the foot switch through the push rod. The foot switch is driven to move, and the valve core and the return spring in the foot proportional control valve 3 are driven to move through the push rod. When the valve core moves downward under the action of the driving force, the return spring inside the foot proportional control valve 3 is driven to move and compress until it is connected with the working port of the foot proportional control valve 3 and the pressure reducing valve 2. When the working port rises, the force acting on the valve core needs to be balanced with the force of the return spring, so as to achieve the effect of proportional pressure reduction. The pressure change of the circuit can be controlled through proportional pressure reduction, so as to accurately control the speed of the rotary brake. Preferably, the pedal proportional control valve 3 in this embodiment can be a single-hole pedal proportional control valve. Preferably, the foot switch in this embodiment can use a foot pedal.

[0033] The adjustable flow valve 4 is used to adjust the pressure impact of the pedal control mechanism during braking, and plays the role of forward throttling and reverse conduction, thereby extending the braking time and alleviating the impact force. And by adjusting the size of the valve opening, the size of the flow of the hydraulic oil can be adjusted, thereby changing the braking delay time and realizing the precise adjustment of the braking delay time. Preferably, the adjustable flow valve 4 in this embodiment can be a one-way throttle valve.

[0034] The shuttle valve 5 is used to connect the manual pulling mechanism 6 and the automatic switching switch of the pedal control mechanism to the circuit of the rotary brake.

[0035] Among them, the manual pulling mechanism 6 can use the manual pulling mechanism in the prior art, such as a pull rod, a hand pump, etc. Like the foot control mechanism, it has a built-in piston structure and realizes dynamic rotary braking by pushing the piston stroke through hydraulic pressure.

[0036] The oil return tank 8 is a part of the hydraulic system in the crane. The hydraulic system includes a pipeline system connected to various mechanisms and valves of the braking system, and hydraulic oil is built in the pipeline.

[0037] The circuit connection structure of the brake system in this embodiment is further described below. Figure 1 As shown, the T port of the redundant safety valve 7 is connected to the return oil tank 8, and the 6 port of the redundant safety valve 7 is respectively connected to the normally open rotary brake device 1 and the K port of the shuttle valve 5; the B port of the shuttle valve 5 is connected to the manual pulling mechanism 6, and the A port of the shuttle valve 5 is connected to the 5 port of the adjustable flow valve 4; the 4 port of the adjustable flow valve 4 is connected to the A port of the foot proportional control valve 3; the T port of the foot proportional control valve 3 is connected to the return oil tank 8, and the P port of the foot proportional control valve 3 is connected to the 1 port of the pressure reducing valve 2; the 2 port of the pressure reducing valve 2 is connected to the P port of the hydraulic control pump 11 of the normally open rotary brake device, the hydraulic control pump 11 is connected to the return oil tank 8, and the 3 port of the pressure reducing valve 2 is connected to the return oil tank 8.

[0038] In this embodiment, the normally closed swing brake device is replaced with a normally open swing brake device 1 to increase the multi-path pressure supply, introduce the hydraulic pressure of the hydraulic control pump 11, and connect it to the 2 ports of the pressure reducing valve 2. By adjusting the pressure reducing valve 2, the maximum pressure required by the brake system can be obtained.

[0039] In this embodiment, as shown in the attached Figure 1 As shown, a pressure gauge 9 is provided at the connection between the normally open swing brake device and the redundant safety valve 7. The brake tightening effect is judged according to the oil pressure change value of the pressure gauge 9. When the pressure exceeds the set value, the redundant safety valve 7 opens to provide safety oil pressure to ensure the safety of the brake device.

[0040] The workflow of this embodiment is as follows:

[0041] When the brake is on and needs to be turned back, the manual pulling mechanism 6 is turned on to open the path of the braking system and cause the brake to stop.

[0042] By operating the foot switch to control the foot proportional pressure reducing valve 2, the pressure of the hydraulic control pump 11 passes through the pressure reducing valve 2 and the adjustable flow valve 4, and is transmitted to the adjustable flow valve 4 in proportion. The flow rate is limited by the adjustable flow valve 4 to relieve the impact force, delay the braking time, and delay the stroke movement of the piston structure. The shuttle valve 5 automatically switches to the control loop of the manual drawing mechanism 6. At this time, the foot switch is controlled to achieve coordinated cooperation and control the pressure changes in the path. The operation is convenient and dynamic rotary braking can be achieved.

[0043] As the pedal pressure increases, the pressure output to the brake system by the pedal proportional control valve 3 also gradually increases, the friction between the brake disc and the brake drum increases, and the brakes gradually become tighter. When the operator releases the pedal switch, the pressure in the hydraulic system is released from the T port of the pedal proportional control valve 3 to the oil tank, and the friction on the brake disc is reduced, so that the brakes are quickly released, ensuring smooth control of the swing brake.

[0044] When the manual pulling mechanism 6 and the foot switch are turned on, the normally open brake is in the open state. When the rotation operation stops, the rotation is still in the sliding stage under the action of inertia, and the speed of the rotation sliding can be controlled by the foot switch. By adjusting the valve opening size of the adjustable flow valve 4, the braking time can be extended and the impact force can be alleviated. Through the redundant safety circuit, it can be automatically activated when the brake fails, providing a stable hydraulic pressure for the brake system to ensure safety.

[0045] In the existing single hand oil pump oil circuit, the pressure is generally less than 80psi (PSI is a unit of pressure, the full name is Pounds per square inch, meaning pounds per square inch), which means that in actual operation, the left hand is required to control the slewing and auxiliary hook linkage operations, and the right hand is required to operate the main hook and boom luffing linkage operations, leaving no hands to control the slewing handbrake, and causing the crane to swing more than or equal to 2 to 5 meters, and the slewing sliding speed is difficult to control and the parking is unstable (the vibration force generated by the collision and impact between gears when the car is reversed). However, through the braking system of the present application, when implemented, such as Figure 1 As shown, the hydraulic control pump 11 can be controlled to output 350psi, and then the working pressure of 260psi is given to the swing brake system through pressure reduction and control.

[0046] Furthermore, the swing dynamic brake pressure is between 70 and 260 psi; the adjustable flow range of the adjustable flow valve 4 is between 0 and 40 L / min (liters per minute), and the maximum working pressure is 2000 psi; the overflow pressure range of the redundant safety valve 7 is between 50 and 500 psi, preferably 180 psi; and the maximum measurement value of the pressure gauge is 1000 psi.

[0047] Embodiment 2:

[0048] This embodiment is based on the first embodiment, and the platform crane is also provided with a cab, in which a driving seat, a control box and a control panel are arranged; the control box and the control panel are arranged in front of the driving seat, and the control box is connected to the control panel; the control box is respectively connected to the normally open slewing brake device 1, the manual pulling mechanism 6, the redundant safety valve 7, the shuttle valve 5, the adjustable flow valve 4, the manual pulling mechanism 6, the foot control mechanism and the pressure reducing valve 2.

[0049] In this embodiment, the redundant safety valve 7 is arranged in the control box; the shuttle valve 5 is arranged in the control box of the cab; the adjustable flow valve 4 is arranged on one side of the control panel; the manual pulling mechanism 6 and the foot control mechanism are arranged in front of the driving seat.

[0050] It can be understood that the platform crane can also use existing technology, and its detailed structure will not be described in detail here.

[0051] It can be understood that the above embodiments only express the preferred implementation methods of the utility model, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the patent scope of the utility model. It should be pointed out that, for ordinary technicians in this field, without departing from the concept of the utility model, the above-mentioned technical features can be freely combined, and several deformations and improvements can be made, which all belong to the protection scope of the utility model. Therefore, all equivalent changes and modifications made to the scope of the claims of the utility model should fall within the scope of the claims of the utility model.

Claims

1. A dynamic braking system for slewing crane of an offshore platform, characterized in that: The braking system includes a normally open slewing brake device, a pressure reducing valve, a foot control mechanism, an adjustable flow valve, a shuttle valve and a manual pulling mechanism; the normally open slewing brake device is connected to the platform crane, and the normally open slewing brake device includes a hydraulic control pump; the hydraulic control pump is connected to the pressure reducing valve, the pressure reducing valve is connected to the foot control mechanism, the foot control mechanism is connected to the adjustable flow valve, the adjustable flow valve is connected to the manual pulling mechanism through the shuttle valve, and the foot control mechanism and the pressure reducing valve are both connected to the return oil tank of the platform crane; the braking system also includes a redundant safety circuit, the redundant safety circuit includes a redundant safety valve, and the redundant safety valve is respectively connected to the normally open slewing brake device, the shuttle valve and the return oil tank.

2. The offshore platform crane slewing dynamic brake system according to claim 1, characterized in that: The foot control mechanism comprises a foot switch, a foot proportional control valve and a push rod; the foot proportional control valve is connected to the foot switch via the push rod.

3. The offshore platform crane slewing dynamic brake system according to claim 2, characterized in that: The T port of the redundant safety valve is connected to the return oil tank, and the 6 port of the redundant safety valve is respectively connected to the normally open rotary brake device and the K port of the shuttle valve; the B port of the shuttle valve is connected to the manual pulling mechanism, and the A port of the shuttle valve is connected to the 5 port of the adjustable flow valve; the 4 port of the adjustable flow valve is connected to the A port of the foot-operated proportional control valve; the T port of the foot-operated proportional control valve is connected to the return oil tank, and the P port of the foot-operated proportional control valve is connected to the 1 port of the pressure reducing valve; the 2 port of the pressure reducing valve is connected to the P port of the hydraulic control pump of the normally open rotary brake device, the hydraulic control pump is connected to the return oil tank, and the 3 port of the pressure reducing valve is connected to the return oil tank.

4. The offshore platform crane slewing dynamic brake system according to claim 1, characterized in that: A pressure gauge is provided at the connection between the normally open swing brake device and the redundant safety valve.

5. The offshore platform crane slewing dynamic brake system according to claim 1, characterized in that: The platform crane is also provided with a cab, in which a driving seat, a control box and a control panel are provided; the control box and the control panel are arranged in front of the driving seat, and the control box is connected to the control panel; the control box is respectively connected to the normally open slewing brake device, the manual pulling mechanism, the redundant safety valve, the shuttle valve, the adjustable flow valve, the manual pulling mechanism, the foot control mechanism and the pressure reducing valve.

6. The offshore platform crane slewing dynamic brake system according to claim 5, characterized in that: The redundant safety valve is arranged in the control box.

7. The offshore platform crane slewing dynamic brake system according to claim 5, characterized in that: The shuttle valve is arranged in a control box in the cab.

8. The offshore platform crane slewing dynamic brake system according to claim 5, characterized in that: The adjustable flow valve is arranged on one side of the control panel.

9. The offshore platform crane slewing dynamic brake system according to claim 5, characterized in that: The manual pulling mechanism and the foot control mechanism are arranged in front of the driving seat.

10. The offshore platform crane slewing dynamic brake system according to claim 5, characterized in that: The pressure reducing valve is arranged at an outlet position of the hydraulic control pump of the foot control mechanism.

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