A hydraulic slewing limit device for a marine crane and a method of using the same

Abstract

The invention discloses a hydraulic slewing limit device for a marine crane and a method for using the same, and relates to the field of crane limit technology, including a crane slewing device for controlling the crane to rotate left or right and a slewing device support cylinder located below the crane slewing device, and also includes a crane multi-way valve, including a plurality of left and right slewing pilot oil circuits; a crane control valve, connected to the crane slewing device, used to control the crane slewing device to rotate left or right; a slewing limit valve, fixed to the outside of the crane slewing device, so that the slewing limit valve rotates synchronously with the crane slewing device, and the slewing limit valve includes a left limit valve and a right limit valve. The slewing angle of the marine crane boom can be achieved to 360 degrees without using a slip ring with a relatively high cost, thereby expanding the working range of the crane.

Description

Technical Field

[0001] The invention relates to the technical field of crane limit technology, and in particular to a hydraulic rotary limit device for a marine crane and a use method thereof. Background Art

[0002] At present, there are two types of slewing angles for marine hydraulic slewing cranes during operation: the first is a slewing angle of less than 360 degrees (limited slewing), which is used to limit the slewing angle of the crane to prevent damage to cables or hydraulic hoses, etc., so as to achieve the purpose of safe operation of the crane. The angle limitation is achieved by setting a slewing limit. The second is full slewing, with a slewing angle of ≥360 degrees (unlimited slewing). There is no limit device for the angle, and any slewing can be achieved, which is achieved by installing an electric slip ring or hydraulic slip ring at the slewing center. For some marine cranes that are not frequently used, have a large working radius, and require a working angle of 360 degrees to achieve no dead angle operation, installing an electric slip ring or hydraulic slip ring alone will undoubtedly increase a lot of manufacturing and maintenance costs. Summary of the invention

[0003] The main purpose of the present invention is to provide a hydraulic slewing limit device for a marine crane and a method for using the same, so as to achieve a slewing angle of 360 degrees without using a slip ring, realize dead angle-free operation, and thereby reduce the manufacturing and maintenance costs of the slewing limit device.

[0004] The purpose of the present invention can be achieved by adopting the following technical solutions:

[0005] A hydraulic slewing limit device for a marine crane and a method for using the same, comprising a crane slewing device for controlling the crane to rotate left or right and a slewing device support cylinder located below the crane slewing device, and also comprising

[0006] The crane multi-way valve includes multiple left and right rotary pilot oil circuits;

[0007] A crane control valve connected to the crane slewing device and used to control the crane slewing device to rotate left or right;

[0008] A slewing limit valve is fixed to the outside of the crane slewing device, so that the slewing limit valve rotates synchronously with the crane slewing device, and the slewing limit valve includes a left limit valve and a right limit valve, the left limit valve is connected to the left slewing pilot oil circuit of the crane slewing device, and the right limit valve is connected to the right slewing pilot oil circuit of the crane slewing device;

[0009] A time-delay reversing valve is connected to the crane control valve and the left limit valve and the right limit valve through hydraulic pipelines, and the time-delay reversing valve is arranged between the swing limit valve and the left and right swing pilot oil circuits of the crane multi-way valve;

[0010] The left limit valve baffle plate and the right limit valve baffle plate are both fixed on the outer side of the support cylinder of the rotary device, and the left limit valve baffle plate and the right limit valve baffle plate are staggered in the upper and lower parts.

[0011] Preferably, a first fixing plate is connected between the left limit valve baffle and the rotating device supporting cylinder, and the first fixing plate is used to extend the position of the left limit valve baffle to cooperate with the left limit valve for use.

[0012] Preferably, a second fixing plate is connected between the right limit valve baffle and the rotating device supporting cylinder, and the second fixing plate is used to extend the position of the right limit valve baffle to cooperate with the right limit valve for use.

[0013] Preferably, both ends of the left limit valve baffle and the right limit valve baffle are bent downward.

[0014] Preferably, rollers are provided at the bottom ends of the left limit valve and the right limit valve.

[0015] Preferably, a left limit valve mounting plate is connected between the left limit valve and the crane slewing device.

[0016] Preferably, a right limit valve mounting plate is connected between the right limit valve and the crane slewing device.

[0017] Preferably, the left limit valve and the right limit valve are staggeredly distributed up and down.

[0018] A method for using a hydraulic slewing limiter for a marine crane, comprising the following steps:

[0019] Step A. The crane turns left and enters the "dead zone", and the crane is controlled to rotate right to make the crane leave the "dead zone" to the right;

[0020] Step B. The crane turns right and enters the "dead zone", and the crane is controlled to rotate left to move the crane out of the "dead zone" to the left.

[0021] Preferably, step A specifically comprises the following steps:

[0022] a1. When the crane is rotating to the left and reaches 0 degrees (360 degrees), the left limit valve hits the left limit valve baffle, and the right limit valve also hits the right limit valve baffle, and the crane enters the "dead zone";

[0023] a2. When the crane is in the left rotation process, under the pressure of the left control oil circuit that leads to the valve core inside the time-delay reversing valve, the valve core of the time-delay reversing valve is in the left position, the left rotation pilot oil circuit of the crane multi-way valve is connected, and the right rotation pilot oil circuit is disconnected;

[0024] a3. Control the crane to rotate right through the crane operating valve, so that the crane moves to the right out of the "dead zone" and works normally.

[0025] Preferably, step B specifically includes the following steps:

[0026] b1. When the crane rotates to the right and reaches 360 degrees (0 degrees), the right limit valve hits the right limit valve baffle, and the left limit valve also hits the left limit valve baffle, and the crane enters the "dead zone";

[0027] b2. When the crane is rotating right, under the pressure of the right control oil circuit that leads to the valve core inside the time-delay reversing valve, the valve core of the time-delay reversing valve is in the right position, the right rotation pilot oil circuit of the crane multi-way valve is connected, and the left rotation pilot oil circuit is disconnected;

[0028] b3. Control the crane to rotate left through the crane operating valve, so that the crane can move left out of the "dead zone" and work normally.

[0029] Beneficial technical effects of the present invention:

[0030] 1. The slewing angle of the marine crane arm can reach 360 degrees without using the high-cost slip ring, which expands the working range of the crane.

[0031] 2. The structure of the crane's rotating part is simplified, which reduces the manufacturing and maintenance costs and facilitates its assembly and use.

[0032] 3. The opening time of the delayed reversing valve core can be adjusted by replacing the damping screw inside the valve body to facilitate precise control of the rotation angle. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 It is a hydraulic principle diagram of a multi-way valve, a rotary limit valve and a time-delay limit valve according to an embodiment of the present invention;

[0034] Figure 2 is a structural schematic diagram of a rotation limiting device according to an embodiment of the present invention;

[0035] Figure 3 It is a schematic diagram of the travel path of the rotary limit valve according to an embodiment of the present invention.

[0036] In the figure: 1-crane multi-way valve, 2-rotation limit valve, 201-left limit valve, 202-right limit valve, 3-delay reversing valve, 4-left limit valve mounting plate, 5-right limit valve mounting plate, 6-left limit valve baffle, 7-right limit valve baffle, 8-crane slewing device, 9-crane operating valve, 10-first fixed plate, 11-second fixed plate, 12-rotating device supporting cylinder. DETAILED DESCRIPTION

[0037] In order to make the technical solution of the present invention more clear and specific to those skilled in the art, the present invention is further described in detail below in conjunction with embodiments and drawings, but the implementation manner of the present invention is not limited thereto.

[0038] like Figure 1-Figure 3 As shown, the hydraulic slewing limit device for a marine crane provided in this embodiment and the method for using the same include a crane slewing device 8 for controlling the crane to rotate left or right and a slewing device support cylinder 12 located below the crane slewing device 8. The crane slewing device 8 can rotate left or right under the drive of a motor.

[0039] The crane multi-way valve 1 includes multiple left and right rotary pilot oil circuits, such as Figure 1 As shown;

[0040] A crane control valve 9 is connected to the crane slewing device 8 and is used to control the crane slewing device 8 to rotate left or right;

[0041] The slewing limit valve 2 is fixed to the outside of the crane slewing device 8 so that the slewing limit valve 2 rotates synchronously with the crane slewing device 8. The slewing limit valve 2 includes a left limit valve 201 and a right limit valve 202. The left limit valve 201 is connected to the left slewing pilot oil circuit of the crane slewing device 8, and the right limit valve 202 is connected to the right slewing pilot oil circuit of the crane slewing device 8.

[0042] The time-delay reversing valve 3 is connected to the crane control valve 9 and the left limit valve 201 and the right limit valve 202 through hydraulic pipelines, and the time-delay reversing valve 3 is arranged between the left and right rotary pilot oil circuits of the rotary limit valve 2 and the crane multi-way valve 1;

[0043] The left limit valve baffle 6 and the right limit valve baffle 7 are both fixed on the outside of the rotary device support cylinder 12. The left limit valve baffle 6 and the right limit valve baffle 7 are both in a fixed state, and the left limit valve baffle 6 and the right limit valve baffle 7 are staggered up and down to prevent the left limit valve 201 from colliding with the right limit valve baffle 7 and the right limit valve 202 from colliding with the left limit valve baffle 6.

[0044] In this embodiment, if Figure 2 As shown, a first fixing plate 10 is connected between the left limit valve baffle 6 and the rotary device supporting cylinder 12 , and the first fixing plate 10 is used to extend the position of the left limit valve baffle 6 to cooperate with the position of the left limit valve 201 for use.

[0045] In this embodiment, if Figure 2 As shown, a second fixing plate 11 is connected between the right limit valve baffle 7 and the rotary device supporting cylinder 12 , and the second fixing plate 11 is used to extend the position of the right limit valve baffle 7 to cooperate with the position of the right limit valve 202 for use.

[0046] In this embodiment, if Figure 2 and Figure 3 As shown, both ends of the left limit valve baffle 6 and the right limit valve baffle 7 are bent downward, that is, the middle is convex, and rollers are provided at the bottom ends of the left limit valve 201 and the right limit valve 202 for the convenience of using the left limit valve baffle 6 and the right limit valve baffle 7.

[0047] In this embodiment, if Figure 2 As shown, a left limit valve mounting plate 4 is connected between the left limit valve 201 and the crane slewing device 8, and a right limit valve mounting plate 5 is connected between the right limit valve 202 and the crane slewing device 8, in order to fix the positions of the left limit valve 201 and the right limit valve 202 respectively.

[0048] In this embodiment, if Figure 2 As shown, the left limit valve 201 and the right limit valve 202 are staggered in the upper and lower parts to adapt to the positions of the left limit valve baffle 6 and the right limit valve baffle 7.

[0049] In this embodiment, when the operator is operating the crane to rotate, the slewing limit valve 2 rotates with the crane slewing device 8. When it hits the corresponding baffle, the limit valve roller presses the corresponding baffle, the limit valve changes direction, and the unloading oil circuit is connected, and the crane slewing device stops.

[0050] In this embodiment, when the crane rotates to 0 degrees (360 degrees) during the left rotation process, the left limit valve 201 hits the left limit valve baffle 6, and the right limit valve 202 also hits the right limit valve baffle 7, and the crane enters the "dead zone". During the left rotation process of the crane, due to the pressure of the left control oil (the left control oil circuit from the inside of the delay reversing valve 3 to the valve core), the valve core of the delay reversing valve 3 is in the left position, and the left rotation pilot oil circuit (left limit oil circuit - Figure 1 The LSa oil circuit in the right rotation oil circuit (the right limit oil circuit - Figure 1 The LSb oil circuit in the crane is disconnected. At this time, the crane is controlled to rotate right through the crane operating valve 9. (Although the valve core of the right limit valve 202 is in the open state under the action of the roller at this time, the right rotation pilot oil circuit is closed by the valve core of the delay reversing valve 3, and the right limit oil circuit still has pressure. The function of the delay reversing valve 3 is to make the crane leave the dead zone first and then open the control oil circuit for right rotation) to make the crane leave the "dead zone" to the right and make it work normally.

[0051] On the contrary, when the crane is rotating to the right, the valve core of the delayed reversing valve 3 is switched to the right position and can also leave the "dead zone" to the left to enable it to work normally.

[0052] A method for using a hydraulic slewing limit device for a marine crane, comprising the following steps:

[0053] Step A. The crane turns left and enters the "dead zone", and the crane is controlled to rotate right to make the crane leave the "dead zone" to the right;

[0054] Step B. The crane turns right and enters the "dead zone", and the crane is controlled to rotate left to move the crane out of the "dead zone" to the left.

[0055] In this embodiment, the specific steps of step A include the following

[0056] a1. When the crane rotates to 0 degrees (360 degrees) during the left rotation, the left limit valve 201 hits the left limit valve baffle 6, and the right limit valve 202 also hits the right limit valve baffle 7, and the crane enters the "dead zone";

[0057] a2. During the left rotation of the crane, under the pressure of the left control oil circuit of the delay reversing valve 3 which leads to the valve core, the valve core of the delay reversing valve 3 is in the left position, the left rotation pilot oil circuit of the crane multi-way valve 1 is connected, and the right rotation pilot oil circuit is disconnected;

[0058] a3. Control the crane to rotate right through the crane operating valve 9, so that the crane moves to the right out of the "dead zone" and works normally.

[0059] In this embodiment, the specific steps of step B include the following

[0060] b1. When the crane rotates to 360 degrees (0 degrees) during the right rotation, the right limit valve 202 hits the right limit valve baffle 7, and the left limit valve 201 also hits the left limit valve baffle 6, and the crane enters the "dead zone";

[0061] b2. During the right rotation of the crane, under the pressure of the right control oil circuit of the delay reversing valve 3 to the valve core, the valve core of the delay reversing valve 3 is in the right position, the right rotation pilot oil circuit of the crane multi-way valve 1 is connected, and the left rotation pilot oil circuit is disconnected;

[0062] b3. Control the crane to rotate left through the crane operating valve 9, so that the crane moves left out of the "dead zone" and works normally.

[0063] In summary, in this embodiment, the arm of the marine crane can be rotated to 360 degrees without using a slip ring with a relatively high cost, thereby expanding the working range of the crane. The structure of the rotating part of the crane is simplified, the manufacturing and maintenance costs are reduced, and the assembly and use thereof are convenient. The opening time of the valve core of the delayed reversing valve can be adjusted by replacing the damping screw inside the valve body to realize the adjustment of the reversing time, which is convenient for accurately controlling the rotation angle.

[0064] The above description is only a further embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical solutions and concepts of the present invention within the scope disclosed by the present invention, which belong to the protection scope of the present invention.

Claims

1. A hydraulic slewing limit device for a marine crane, characterized in that: It comprises a crane slewing device (8) for controlling the crane to rotate left or right and a slewing device supporting cylinder (12) located below the crane slewing device (8), and also comprises A crane multi-way valve (1) comprises a plurality of left-swing pilot oil circuits and a plurality of right-swing pilot oil circuits; A crane control valve (9) connected to the crane slewing device (8) and used to control the crane slewing device (8) to rotate left or right; A slewing limit valve (2) is fixed to the outside of the crane slewing device (8), so that the slewing limit valve (2) rotates synchronously with the crane slewing device (8), the slewing limit valve (2) comprising a left limit valve (201) and a right limit valve (202), the left limit valve (201) being connected to the left slewing pilot oil circuit of the crane slewing device (8), and the right limit valve (202) being connected to the right slewing pilot oil circuit of the crane slewing device (8); A time-delay reversing valve (3) is connected to the crane control valve (9) and the left limit valve (201) and the right limit valve (202) respectively through hydraulic pipelines, and the time-delay reversing valve (3) is arranged between the left and right slewing pilot oil circuits of the slewing limit valve (2) and the crane multi-way valve (1); The left limit valve baffle (6) and the right limit valve baffle (7) are both fixed on the outside of the rotary device support cylinder (12), and the left limit valve baffle (6) and the right limit valve baffle (7) are staggered in vertical arrangement; A first fixing plate (10) is connected between the left limit valve baffle (6) and the rotary device support cylinder (12), and the first fixing plate (10) is used to extend the position of the left limit valve baffle (6) so as to cooperate with the left limit valve (201) for use; A second fixing plate (11) is connected between the right limit valve baffle (7) and the rotary device supporting cylinder (12), and the second fixing plate (11) is used to extend the position of the right limit valve baffle (7) so as to cooperate with the right limit valve (202) for use.

2. The hydraulic rotation limit device for a marine crane according to claim 1, characterized in that: Both ends of the left limit valve baffle (6) and the right limit valve baffle (7) are bent downwards.

3. The hydraulic rotation limit device for a marine crane according to claim 1, characterized in that: Rollers are provided at the bottom ends of the left limit valve (201) and the right limit valve (202).

4. The hydraulic rotation limit device for a marine crane according to claim 1, characterized in that: A left limit valve mounting plate (4) is connected between the left limit valve (201) and the crane slewing device (8).

5. The hydraulic rotation limit device for a marine crane according to claim 1, characterized in that: A right limit valve mounting plate (5) is connected between the right limit valve (202) and the crane slewing device (8), and the left limit valve (201) and the right limit valve (202) are alternately arranged up and down.

6. A method for using a hydraulic slewing limiter for a marine crane, applied to a hydraulic slewing limiter for a marine crane as claimed in any one of claims 1 to 5, characterized in that: The following steps are included: Step A. The crane turns left and enters the "dead zone", and the crane is controlled to rotate right to make the crane move to the right out of the "dead zone"; Step A The specific steps include the following a1. When the crane rotates to the left and reaches 0 degrees, the left limit valve (201) hits the left limit valve baffle (6), and the right limit valve (202) also hits the right limit valve baffle (7), and the crane enters the "dead zone"; a2. When the crane is in the left rotation process, under the pressure of the left control oil circuit connected to the valve core inside the time delay reversing valve (3), the valve core of the time delay reversing valve (3) is in the left position, the left rotation pilot oil circuit of the crane multi-way valve (1) is connected, and the right rotation pilot oil circuit is disconnected; a3. The crane is controlled to rotate rightward by the crane control valve (9), so that the crane moves rightward out of the "dead zone" and operates normally; Step B. The crane rotates right and enters the "dead zone", and controls the crane to rotate left to make the crane leave the "dead zone" to the left; Step B The specific steps include the following b1. When the crane rotates to the right and reaches 360 degrees, the right limit valve (202) hits the right limit valve baffle (7). At this time, the left limit valve (201) also hits the left limit valve baffle (6), and the crane enters the "dead zone". b2. When the crane is rotating right, under the pressure of the right control oil circuit connected to the valve core inside the time-delay reversing valve (3), the valve core of the time-delay reversing valve (3) is in the right position, the right rotation pilot oil circuit of the crane multi-way valve (1) is connected, and the left rotation pilot oil circuit is disconnected; b3. Control the crane to rotate left through the crane control valve (9) so that the crane moves left out of the "dead zone" and works normally.

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