Crane slewing brake control system, crane and control method

Abstract

The application discloses an engineering machinery technical field, a crane slewing brake control system, a crane and a control method, wherein the control system comprises: a slewing change-over valve, a slewing motor, a slewing brake, a change-over identifier and a brake control valve; the slewing change-over valve is connected with the slewing motor and is used for changing the inlet and outlet oil way of the slewing motor through a change-over action; the change-over identifier is arranged on the slewing change-over valve and is used for identifying a change-over state; the brake control valve is connected with the slewing brake and is used for driving the slewing brake to act according to the change-over state; the slewing brake is arranged on the slewing motor and is used for starting or closing the brake of the slewing motor; the control method comprises: when the change-over identifier identifies that the slewing change-over valve is left-right change-over, the brake control valve is electrified, and the slewing brake is unlocked; when the change-over is reset, the brake control valve is de-energized, and the slewing brake is locked; the application can control the mechanical control type crane slewing brake to start and close automatically and solve the slewing self-rotation problem.

Description

Technical Field

[0001] This invention relates to the field of engineering machinery technology, and in particular to a crane slewing braking control system, a crane, and a control method. Background Technology

[0002] Currently, many medium and large tonnage cranes on the market can achieve 360-degree rotation. These improvements in crane performance greatly facilitate cargo handling. However, in environments with tilted frames or strong winds, self-rotation during slewing can easily occur, posing certain safety hazards. Hydraulically and electrically controlled cranes are equipped with automatic slewing brake opening and closing functions. This means that the slewing brake automatically opens during slewing and automatically closes after the slewing motion stops, locking the slewing mechanism and preventing self-rotation. Due to the mechanical reversing characteristics of mechanically controlled cranes, the slewing brake is always in a normally open mode during onboard operation. Unlike pilot-operated and electrically controlled cranes, which use pilot control pressure and handle output signals for slewing recognition and automatic slewing brake opening and closing, mechanically controlled cranes cannot automatically open and close the slewing brake, thus posing a certain safety hazard. Summary of the Invention

[0003] The purpose of this invention is to overcome the shortcomings of the prior art and provide a crane slewing braking control system, a crane and a control method to solve the technical problem that mechanically operated cranes cannot perform effective slewing braking.

[0004] To achieve the above objectives, the present invention is implemented using the following technical solution:

[0005] In a first aspect, the present invention provides a crane slewing braking control system, including a slewing reversing valve, a slewing motor, a slewing brake, a reversing identifier, and a brake control valve;

[0006] The slewing reversing valve is connected to the slewing motor and is used to change the inlet and outlet oil circuits of the slewing motor through a reversing action;

[0007] The reversing identifier is disposed on the reversing valve and is used to identify the reversing status;

[0008] The brake control valve is connected to the rotary brake and is used to drive the rotary brake to operate according to the reversing state.

[0009] The slewing brake is mounted on the slewing motor and is used to start or stop the braking of the slewing motor.

[0010] Optionally, the directional valve is a mechanical directional valve, which includes a valve core, an oil port, and a lever. The lever is located at one end of the valve core, and the valve core is driven to move by the lever, thereby changing the conduction relationship of the oil port to achieve directional switching.

[0011] Optionally, the mechanical slewing valve is a three-position four-way valve, with an inlet, an outlet, and two working ports. The inlet and outlet of the mechanical slewing valve are respectively connected to the oil supply end P1 and the oil return end of the hydraulic system, and the two working ports of the mechanical slewing valve are respectively connected to the two working ports of the rotary motor.

[0012] Optionally, the two working ports of the mechanical directional valve are also connected to the oil supply end P1 and the oil return end of the hydraulic system via check valves.

[0013] Optionally, the reversing identifier includes a housing, a slide rail inside the housing, a slider slidably mounted on the slide rail, a slide rod connected to the slider, and the slide rod coaxially connected to the valve core; a proximity sensor is provided on one side of the slider; when the valve core moves, the slider is driven to move by the slide rod, and the reversing state is identified by detecting the movement of the slider by the proximity sensor.

[0014] Optionally, the slide is a circular groove, the slider is an annular, its inner wall is connected to the slide rod, its outer wall is slidably connected to the slide, and a groove is also provided in the middle of the outer wall.

[0015] Optionally, the inner wall of the slider is slidably connected to the slide rod, and the slider and the slide rod are fixed in the groove by fastening screws.

[0016] Optionally, the brake control valve is a two-position three-way solenoid valve, with an oil port including an inlet, an outlet, and a working port. The inlet and outlet of the brake control valve are respectively connected to the oil supply end P2 and the oil return end of the hydraulic system, and the working port of the brake control valve is connected to the working port of the rotary brake.

[0017] Secondly, the present invention provides a crane including the above-described crane slewing braking control system.

[0018] Thirdly, the present invention provides a control method for a crane slewing braking control system, employing the crane slewing braking control system as described above, the control method comprising:

[0019] When the reversing identifier detects that the slewing reversing valve is reversing to left or right, the brake control valve is energized, and pressurized oil enters the slewing brake through the brake control valve, thus unlocking the slewing brake.

[0020] When the reversing identifier detects that the slewing reversing valve is reversing and resetting, it de-energizes the brake control valve, cuts off the pressure oil by the brake control valve, and locks the slewing brake.

[0021] Compared with the prior art, the beneficial effects achieved by the present invention are as follows:

[0022] The present invention provides a crane slewing braking control system, a crane and a control method. When the control system is applied to a mechanically operated crane, a reversing identifier is added to the original mechanical slewing reversing valve to identify the reversing state and provide a control signal to the brake control valve, thereby realizing the same slewing braking function as pilot-operated and electrically operated cranes. Attached Figure Description

[0023] Figure 1 This is a connection diagram of the crane slewing braking control system provided in an embodiment of the present invention;

[0024] Figure 2 This is a schematic diagram of the commutation identifier provided in an embodiment of the present invention;

[0025] Figure 3 This is a schematic diagram illustrating the identification of the directional valve in the neutral position according to an embodiment of the present invention;

[0026] Figure 4 This is a schematic diagram illustrating the identification of the directional valve switching to the left according to an embodiment of the present invention;

[0027] Figure 5 This is a schematic diagram illustrating the identification of the directional valve switching to the right direction provided in an embodiment of the present invention;

[0028] The diagram is marked as follows:

[0029] 1. Reversing valve; 2. Reversing motor; 3. Reversing brake; 4. Reversing identifier; 41. Housing; 42. Slide rail; 43. Slider; 44. Slide rod; 45. Proximity sensor; 46. Fastening screw; 47. Groove; 5. Brake control valve; 6. Check valve. Detailed Implementation

[0030] The present invention will be further described below with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and should not be used to limit the scope of protection of the present invention.

[0031] Example 1:

[0032] like Figure 1As shown, this embodiment of the invention provides a crane slewing braking control system, including a slewing reversing valve 1, a slewing motor 2, a slewing brake 3, a reversing identifier 4, and a brake control valve 5; the slewing reversing valve 1 is connected to the slewing motor 2 and is used to change the inlet and outlet oil circuits of the slewing motor 2 through reversing actions; the reversing identifier 4 is disposed on the slewing reversing valve 1 and is used to identify the reversing state; the brake control valve 5 is connected to the slewing brake 3 and is used to drive the slewing brake 3 to act according to the reversing state; the slewing brake 3 is disposed on the slewing motor 2 and is used to start or stop braking the slewing motor 2.

[0033] The directional control valve 1 is a three-position four-way mechanical directional control valve. The mechanical directional control valve includes a valve core, oil ports, and a lever. The lever is located at one end of the valve core, and the valve core is driven to move via the lever, thereby changing the conduction relationship of the oil ports to achieve directional control. The oil ports include an inlet port, an outlet port, and two working ports. The inlet and outlet ports of the mechanical directional control valve are respectively connected to the oil supply end P1 and the oil return end of the hydraulic system. The two working ports of the mechanical directional control valve are respectively connected to the two working ports of the rotary motor 2.

[0034] When the left working port of the mechanical directional valve is connected to the inlet and the right working port is connected to the outlet, the pressure oil at the supply end P1 enters the rotary motor 2 through the inlet and the left working port, and the rotary motor 2 rotates to the left; when the right working port of the mechanical directional valve is connected to the inlet and the left working port is connected to the outlet, the pressure oil at the supply end P1 enters the rotary motor 2 through the inlet and the right working port, and the rotary motor 2 rotates to the right.

[0035] The two working ports of the mechanical directional valve are also connected to the hydraulic system's supply end P1 and return end via check valves 6, respectively, to provide pressure relief protection for the rotary motor 2. In other optional embodiments, a relief valve can also be used for protection.

[0036] The brake control valve 5 is a two-position three-way solenoid valve. Its oil ports include an inlet, an outlet, and a working port. The inlet and outlet of the brake control valve 5 are respectively connected to the oil supply end P2 and the oil return end of the hydraulic system. The working port of the brake control valve 5 is connected to the working port of the rotary brake 3.

[0037] When the brake control valve 5 is energized, the oil inlet and working port of the brake control valve 5 are connected, and the pressure oil at the oil supply end P2 enters the rotary brake 3 through the oil inlet and working port, thus unlocking the rotary brake 3; when the brake control valve 5 is de-energized, the working port and outlet of the brake control valve 5 are connected, and the pressure oil at the oil supply end P2 cannot be cut off, thus unlocking the rotary brake 3.

[0038] The reversing identifier 4 includes a housing 41, a slide rail 42 is provided inside the housing 41, a slider 43 is slidably arranged on the slide rail 42, a slide rod 44 is connected to the slider 43, and the slide rod 44 is coaxially connected to the valve core; a proximity sensor 45 is provided on one side of the slider 43; when the valve core moves, the slide rod 44 drives the slider 43 to move, and the proximity sensor 45 detects the movement of the slider 43 to identify the reversing state.

[0039] During setup, to avoid the sliding rod 44 interfering with the operation of the pull rod, the sliding rod 44 and the pull rod are respectively positioned at both ends of the valve core. The slide rail 42 is a circular groove, and the slider 43 is an annular shape. Its inner wall is connected to the sliding rod 44, and its outer wall is slidably connected to the slide rail 42. A groove 47 is also provided in the middle of the outer wall. The outer walls of the slider 43 on both sides of the groove 47 are higher than the outer walls of the slider 43 at the groove 47, thereby facilitating detection by the proximity sensor 45.

[0040] To facilitate the calibration of the proximity sensor 45 and the slider 43, the inner wall of the slider 43 is also slidably connected to the slide rod 44. When the valve core is in the reset state, the slider 43 is adjusted to the position directly opposite the proximity sensor 45 and then fixed by the fastening screw 46. The fastening screw 46 is set in the groove 47 to avoid affecting the sliding of the slider 43.

[0041] The housing 41 has a through hole. Depending on its size, the proximity sensor 45 can be placed inside the through hole with its acquisition end facing the slider 43, or it can be placed on the outer wall of the housing 41 with its acquisition end facing the slider 43 through the through hole.

[0042] like Figure 3 , Figure 4 , Figure 5 The diagrams shown illustrate the identification of the directional valve 1 in the neutral position, when switching to the left, and when switching to the right. The control logic is as follows:

[0043] (1) Pull the lever on the mechanical slewing valve, the valve core moves to the left, and the valve core drives the slider 43 to move through the slide bar 44. The proximity sensor 45 detects the edge protrusion of the slider 43 and generates an induction signal. At the same time, an electrical signal is transmitted to energize the brake control valve 5 to switch directions. The pressure oil at the oil supply end P2 is connected to the small chamber of the slewing brake 3 and the slewing brake 3 is opened.

[0044] (2) After the rotary brake 3 is opened, continue to pull the lever on the mechanical rotary reversing valve. The valve core continues to move to the left, and the oil supply end P1 is connected to port A of the rotary motor 2, driving the rotary motor 2 to rotate. In order to ensure that the proximity sensor 45 continuously generates a sensing signal during this process, the length of the edge protrusion of the slider 43 should be reasonably set.

[0045] (3) When it is necessary to stop the slewing motion, operate the lever on the mechanical slewing reversing valve to reset, the valve core moves to the right, and the valve core drives the slider 43 to move through the slide rod 44. When the proximity sensor 45 cannot detect the edge protrusion of the slider 43, no sensing signal is generated, the brake control valve 5 is de-energized and reversed, the pressure oil at the oil supply end P2 is cut off from the small chamber of the slewing brake 3, and the slewing brake is closed. When the valve core reaches the neutral position, the oil supply end P1 is cut off from the A port of the slewing motor 2.

[0046] Example 2:

[0047] Based on the crane slewing braking control system provided in Embodiment 1, this embodiment of the invention provides a crane including the aforementioned crane slewing braking control system.

[0048] Example 3:

[0049] Based on the crane slewing braking control system provided in Embodiment 1, this embodiment of the invention provides a control method for the crane slewing braking control system, the control method comprising:

[0050] When the reversing identifier detects that the slewing reversing valve is reversing to the left or right, it energizes the brake control valve, and the pressurized oil enters the slewing brake through the brake control valve, thus unlocking the slewing brake.

[0051] When the reversing identifier detects that the slewing reversing valve is reversing and resetting, it de-energizes the brake control valve, cuts off the pressure oil by the brake control valve, and locks the slewing brake.

[0052] Those skilled in the art will understand that embodiments of the present invention can be provided as methods, systems, or computer program products. Therefore, the present invention can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects.

[0053] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A crane swing brake control system, characterized by, This includes a slewing reversing valve, a slewing motor, a slewing brake, a slewing recognition device, and a brake control valve; The slewing reversing valve is connected to the slewing motor and is used to change the inlet and outlet oil circuits of the slewing motor through a reversing action. The slewing reversing valve is a mechanical slewing reversing valve, which includes a valve core, an oil port, and a pull rod. The pull rod is located at one end of the valve core, and the valve core is driven to move by the pull rod, thereby changing the conduction relationship of the oil port to achieve reversing. The reversing identifier is disposed on the reversing valve and is used to identify the reversing state. The reversing identifier includes a housing, a slide rail is disposed inside the housing, a slider is slidably disposed on the slide rail, a slide rod is connected to the slider, and the slide rod is coaxially connected to the valve core. A proximity sensor is disposed on one side of the slider. When the valve core moves, the slider is driven to move by the slide rod, and the reversing state is identified by detecting the movement of the slider by the proximity sensor. The brake control valve is connected to the rotary brake and is used to drive the rotary brake to operate according to the reversing state. The slewing brake is mounted on the slewing motor and is used to start or stop the braking of the slewing motor. When the reversing identifier detects that the slewing reversing valve is reversing left or right, the brake control valve is energized, and pressurized oil enters the slewing brake through the brake control valve, thus unlocking the slewing brake. When the reversing identifier detects that the slewing reversing valve is reversing and resetting, the brake control valve is de-energized, the pressurized oil is cut off by the brake control valve, and the slewing brake is locked.

2. The crane swing brake control system of claim 1, wherein, The mechanical slewing valve is a three-position four-way valve, with an inlet, an outlet, and two working ports. The inlet and outlet of the mechanical slewing valve are respectively connected to the oil supply end P1 and the oil return end of the hydraulic system, and the two working ports of the mechanical slewing valve are respectively connected to the two working ports of the rotary motor.

3. The crane swing brake control system according to claim 2, characterized in that, The two working ports of the mechanical directional valve are also connected to the oil supply end P1 and the oil return end of the hydraulic system via check valves.

4. The crane slewing braking control system according to claim 1, characterized in that, The slide is a circular groove, and the slider is a circular ring. Its inner wall is connected to the slide rod, and its outer wall is slidably connected to the slide. A groove is also provided in the middle of the outer wall.

5. The crane slewing braking control system according to claim 4, characterized in that, The inner wall of the slider is slidably connected to the slide rod, and the slider and the slide rod are fixed in the groove by fastening screws.

6. The crane slewing braking control system according to claim 1, characterized in that, The brake control valve is a two-position three-way solenoid valve, with an oil port including an inlet, an outlet, and a working port. The inlet and outlet of the brake control valve are respectively connected to the oil supply end P2 and the oil return end of the hydraulic system, and the working port of the brake control valve is connected to the working port of the rotary brake.

7. A crane, characterized in that, Including the crane slewing brake control system as described in any one of claims 1-6.

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