Boom raising method and operating machine

Abstract

The present invention relates to the field of lifting machinery, and provides a boom raising method and an operating machine. First, the lifting rope is passed forward and passed around the top of the main arm and the auxiliary arm in turn. After passing around the head end of the auxiliary arm, the free end of the lifting rope is fixed. It can be fixed to the ground below the boom, or extended backward and fixed on the main body of the operating machine. Then, the lifting rope is recovered, and the lifting rope pulls the head end of the auxiliary arm to move in the direction close to the main body of the operating machine. The lifting rope drives the auxiliary arm to lift the head end of the main arm upward, thereby achieving the effect of lifting the main arm. The boom raising method provided by the present invention utilizes the characteristic of the lifting mechanism having a large lifting weight. In the early stage of boom raising, when the lifting force required for the main arm is large, the main arm is lifted by a lifting mechanism with a large pulling force, thereby reducing the dependence on the main luffing mechanism. During production, the design strength and lifting force of the main luffing mechanism can be appropriately reduced, thereby saving production costs.

Description

Technical Field

[0001] The present invention relates to the technical field of lifting machinery, and in particular to a boom raising method and an operating machinery. Background Art

[0002] Among the working machines provided with a boom, there is a crawler crane, which is composed of a chassis, a turntable, a main arm and a main luffing mechanism. The turntable is rotatably connected to the chassis, the main arm is hinged to the turntable, and the main luffing mechanism is arranged on the turntable and is used to drive the main arm to perform a pitching action. Under some working conditions, it is also necessary to install a jib at the head end of the main arm, and to set a secondary luffing mechanism between the main arm and the jib, the tail end of the jib is hinged to the head end of the main arm, and the secondary luffing mechanism is used to drive the jib to perform a pitching action.

[0003] For crawler cranes equipped with jibs, when raising the boom, the main luffing mechanism is first used to pull up the main boom, and then the auxiliary luffing mechanism is used to pull up the jib. The addition of the jib increases the total weight and total length of the boom, which requires the main luffing mechanism to provide a larger pulling force when the main boom is pulled up, thus placing higher requirements on the strength and performance of the main luffing mechanism. Summary of the invention

[0004] The present invention provides a boom raising method and an operating machine, which are used to solve the defect that a crawler crane with a secondary boom in the prior art has high requirements on the strength and performance of a main luffing mechanism in the initial stage of boom raising, and realize the effect of lifting the main boom by a lifting mechanism in the initial stage of boom raising.

[0005] The present invention provides an arm raising method for lifting the arm of an operating machine, wherein the arm includes a main arm and a secondary arm, and comprises: passing the free end of a lifting rope around the head end of the secondary arm and fixing the free end of the lifting rope; retrieving the lifting rope, wherein the lifting rope pulls the head end of the secondary arm to move toward a direction close to the main body of the operating machine, and the tail end of the secondary arm lifts the head end of the main arm upward.

[0006] According to the boom raising method provided by the present invention, while the lifting rope is being recovered, the following steps are performed: the main luffing mechanism of the working machine lifts the main boom.

[0007] According to the arm raising method provided by the present invention, when the angle between the main arm and the auxiliary arm reaches a preset angle, the following steps are performed: stop the action of recovering the lifting rope; fix the angle between the main arm and the auxiliary arm; release the free end of the lifting rope.

[0008] According to the boom raising method provided by the present invention, fixing the angle between the main boom and the auxiliary boom includes: a secondary luffing mechanism tightens the auxiliary boom so that the angle between the auxiliary boom and the main boom is greater than or equal to the preset angle.

[0009] According to the arm raising method provided by the present invention, after the auxiliary luffing mechanism tightens the auxiliary arm, the following steps are further performed: the main luffing mechanism drives the main arm and the auxiliary arm to move to the main arm working position; the auxiliary luffing mechanism drives the auxiliary arm to move to the auxiliary arm working position.

[0010] According to the boom raising method provided by the present invention, a supporting device is arranged below the main boom, and the supporting device is used to make the angle between the main boom and the ground greater than or equal to zero degree before the boom is raised.

[0011] According to the arm raising method provided by the present invention, before the arm is raised, the angle between the bottom surface of the auxiliary arm and the bottom surface of the main arm is less than 180 degrees.

[0012] According to the arm raising method provided by the present invention, a sliding mechanism is provided below the head end of the auxiliary arm.

[0013] According to the arm raising method provided by the present invention, the preset angle is greater than or equal to the limiting angle between the main arm and the auxiliary arm.

[0014] The present invention also provides an operating machine, including a chassis, a boom, a main luffing mechanism, an auxiliary luffing mechanism and a lifting mechanism, the boom including a main arm and a auxiliary arm, the tail end of the main arm is hinged to the chassis, the tail end of the auxiliary arm is hinged to the head end of the main arm, the main luffing mechanism is used to drive the main arm to perform a pitching action, the auxiliary luffing mechanism is used to drive the auxiliary arm to perform a pitching action, the free end of the lifting rope of the lifting mechanism is passed around the head end of the auxiliary arm, and the main arm uses the arm raising method as described in any of the above items to perform the arm raising action.

[0015] The arm raising method provided by the present invention is used for lifting the arm of an operating machine, and the arm includes a main arm and a jib. In the method, first, the free end of the lifting rope of the lifting mechanism used for lifting heavy objects in the operating machine is passed forward and passed around the top of the main arm and the top of the jib in turn, and after passing around the head end of the jib, the free end of the lifting rope is fixed, which can be fixed on the ground below the arm, or can be extended backward at the bottom of the arm and fixed on the main body of the operating machine. Then, the lifting mechanism is made to perform the action of recovering the lifting rope, and the length of the main arm and the jib is fixed. In the process of recovering the lifting rope, the lifting rope pulls the head end of the jib to move in the direction close to the main body of the operating machine, and the tail end of the jib pushes up the head end of the main arm, so as to achieve the effect of lifting the main arm. The arm raising method provided by the present invention utilizes the characteristic of the lifting mechanism with large lifting weight. In the early stage of arm raising, when the lifting force required by the main arm is large, the lifting mechanism with large pulling force is used to lift the main arm, thereby reducing the dependence on the main luffing mechanism. During production, the design strength and lifting force of the main luffing mechanism can be appropriately reduced, thereby saving production costs.

[0016] Furthermore, in the operating machine provided by the present invention, since the operating machine uses the above-mentioned boom raising method to lift the main boom in the initial stage of boom raising, it has the same advantages as the above-mentioned boom raising method. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 It is the state of the crawler crane provided by the present invention when the free end of the lifting rope is connected to the chassis and the boom is ready to be raised;

[0019] Figure 2 It is the state 1 of the crawler crane provided by the present invention when it is in the middle of the boom raising;

[0020] Figure 3 This is the second state of the crawler crane provided by the present invention when it is in the middle of the boom raising;

[0021] Figure 4 It is the state when the main arm and auxiliary arm of the crawler crane provided by the present invention reach a preset angle;

[0022] Figure 5 is a flow chart of the arm raising method provided by the present invention;

[0023] Reference numerals:

[0024] 100, chassis; 200, turntable; 310, main boom; 320, jib; 410, main luffing mast; 420, main boom traction member; 430, main boom traction rope; 510, first secondary luffing mast; 520, second secondary luffing mast; 530, first jib traction member; 540, second jib traction member; 550, jib traction rope; 600, lifting rope; 700, horse stool. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the drawings of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0026] Combine the following Figures 1 to 5 The arm raising method and working machine of the present invention are described.

[0027] See also Figure 1 to Figure 4 The working machine in the embodiments disclosed below may be a crawler crane, which includes a chassis 100, a turntable 200, a boom, a main luffing mechanism, an auxiliary luffing mechanism and a lifting mechanism.

[0028] The turntable 200 is disposed on the top of the chassis 100 . The turntable 200 is rotatably connected to the chassis 100 . A rotation driving device is disposed between the turntable 200 and the chassis 100 . The rotation axis of the turntable 200 is along the vertical direction.

[0029] The boom includes a main arm 310 and a secondary arm 320, wherein the end of the main arm 310 and the secondary arm 320 away from the chassis 100 is the head end, and the end close to the chassis 100 is the tail end. When connected, the tail end of the main arm 310 is rotatably connected to the turntable 200, and the rotation axis is in the horizontal direction. The tail end of the secondary arm 320 is rotatably connected to the head end of the main arm 310, and the rotation axis is in the horizontal direction.

[0030] The main luffing mechanism includes a main luffing mast 410, a main arm traction member 420 and a main luffing winch.

[0031] The bottom end of the main luffing mast 410 is hinged to the turntable 200 , and the rotation axis is along the horizontal direction, wherein the rotation axes of the main luffing mast 410 , the main arm 310 and the auxiliary arm 320 are parallel.

[0032] The main arm traction member 420 can be a pull plate or a steel wire rope, one end of which is connected to the top of the main luffing mast 410, and the other end is connected to the head end of the main arm 310. When the main luffing mast 410 rotates backward, the main arm traction member 420 drives the head end of the main arm 310 to move upward through the main arm traction member 420, thereby realizing the action of raising the main arm 310.

[0033] The main luffing winch is arranged at a position of the turntable 200 on the side of the main luffing mast 410 away from the main boom 310. A pulley block is arranged at the tail of the turntable 200 and the top of the main luffing mast 410. The free end of the main boom traction rope 430 of the main luffing winch is passed back and forth between the pulley blocks of the turntable 200 and the main luffing mast 410. When the main luffing winch rotates in the direction of tightening the main boom traction rope 430, the main boom traction rope 430 drives the main luffing mast 410 to rotate backward. When the main luffing winch rotates in the direction of loosening the main boom traction rope 430, under the action of the gravity of the main boom 310, the main luffing mast 410 is driven to rotate forward through the main boom traction member 420.

[0034] It should be noted that the aforementioned rear refers to a side of the main luffing mast 410 away from the main boom 310 , and the front refers to a side of the main luffing mast 410 close to the main boom 310 .

[0035] The auxiliary luffing mechanism comprises a first auxiliary luffing mast 510, a second auxiliary luffing mast 520 and an auxiliary luffing winch.

[0036] Among them, the first auxiliary boom mast 510 is a truss structure, and its bottom end is hinged to the head end of the main boom 310. A first auxiliary boom traction member 530 is arranged between the top of the first auxiliary boom mast 510 and the tail end of the main boom 310. The first auxiliary boom traction member 530 can be a pull plate or a steel wire rope.

[0037] The second auxiliary luffing mast 520 is also a truss structure, and its bottom end is hinged to the head end of the main boom 310. The angle between the second auxiliary luffing mast 520 and the main boom 310 is greater than the angle between the first auxiliary luffing mast 510 and the main boom 310. A second jib traction member 540 is provided between the second auxiliary luffing mast 520 and the head end of the jib 320, and the second jib traction member 540 can also be a pull plate or a wire rope.

[0038] The auxiliary luffing winch may be arranged at the tail end of the main arm 310 , and the auxiliary arm traction rope 550 of the auxiliary luffing winch sequentially passes around the bottom of the first auxiliary luffing mast 510 , the top of the first auxiliary luffing mast 510 , and the top of the second auxiliary luffing mast 520 .

[0039] The first jib pulling member 530 and the jib pulling rope 550 pull the first secondary luffing mast 510 in opposite directions and can be regarded as a pair of interacting forces, thereby ensuring that the angle between the first secondary luffing mast 510 and the main boom 310 is a fixed value.

[0040] When the auxiliary luffing winch rotates to retract the jib traction rope 550, the jib traction rope 550 drives the second auxiliary luffing mast 520 to rotate toward the first auxiliary luffing mast 510, and at the same time, the second auxiliary luffing mast 520 drives the jib 320 to rotate and unfold in a direction away from the main arm 310 through the second jib traction member 540. When the auxiliary luffing winch rotates to release the jib traction rope 550, the jib 320 rotates relative to the main arm 310 under the action of the gravity of the jib 320, and the rotation of the jib 320 drives the second auxiliary luffing mast 520 to rotate in a direction away from the first auxiliary luffing mast 510 through the second jib traction member 540.

[0041] The lifting mechanism is arranged on the turntable 200, and the lifting mechanism lifts the heavy object by means of the lifting rope 600. The lifting rope 600 sequentially passes around the top of the tail end of the main arm 310, the top of the head end of the main arm 310, the top of the tail end of the auxiliary arm 320 and the top of the head end of the auxiliary arm 320, and finally hangs freely downward at the front end of the auxiliary arm 320.

[0042] In the prior art, the arm raising action is as follows:

[0043] Before raising the arm, a support structure is provided below the main arm 310 to keep the main arm 310 approximately parallel to the ground, and a pulley or a pulley car is provided below the head end of the auxiliary arm 320.

[0044] When raising the arm, the main luffing winch tightens the main arm traction rope 430, so that the main arm traction rope 430 drives the main luffing mast 410 to rotate backward, and then the main luffing mast 410 drives the head end of the main arm 310 to move upward through the main arm traction member 420, thereby realizing the action of raising the main arm 310.

[0045] At the same time, the auxiliary luffing winch rotates to loosen the auxiliary arm traction rope 550, and the tail end of the auxiliary arm 320 moves upward with the head end of the main arm 310, and the head end of the auxiliary arm 320 moves on the ground toward the chassis 100 by means of a pulley or a pulley car.

[0046] When the main boom 310 is lifted to a certain height, the main boom 310 and the auxiliary boom 320 reach the position of the limit angle. At this time, the auxiliary luffing winch tightens the auxiliary boom traction rope 550 so that the angle between the main boom 310 and the auxiliary boom 320 does not continue to decrease, thereby preventing the main boom 310 and the auxiliary boom 320 from being damaged.

[0047] The main luffing winch continues to retract the main boom traction rope 430 and lifts the main boom 310 to a required height, and the lifting action of the main boom 310 is completed.

[0048] Then, the auxiliary luffing winch recovers the jib traction rope 550, so that the jib traction rope 550 drives the second auxiliary luffing mast 520 to rotate towards the direction close to the first auxiliary luffing mast 510, and then the second auxiliary luffing mast 520 drives the head end of the jib 320 to move upward through the jib traction member until the jib 320 is lifted to the required height, at which time the entire boom raising action is completed.

[0049] In the above-mentioned boom raising action, at the initial stage of boom raising, the required boom raising torque is relatively large, and the main luffing winch needs to provide a large pulling force, which places high requirements on the main luffing winch and requires the main luffing winch to have high strength, thereby increasing the cost of the main luffing winch. At the same time, the length and structural strength of the main luffing mast 410 need to be increased.

[0050] However, before the boom enters the working state, the lifting mechanism is in an idle state, and the existing technology cannot effectively utilize the large pulling force of the lifting mechanism, resulting in a waste of resources. The arm raising method provided by the present invention can make good use of the large lifting force of the lifting mechanism. When a large lifting pulling force is required in the initial stage of arm raising, the lifting mechanism is used to assist the main arm 310 in arm raising, thereby solving the above-mentioned technical problems.

[0051] The arm raising method provided by the present invention is as follows:

[0052] Step S100: Wrap the free end of the lifting rope 600 around the head end of the auxiliary arm 320, and fix the free end of the lifting rope 600.

[0053] This step is completed before raising the arm. The lifting rope 600 of the lifting mechanism has now passed around the top of the tail end of the main arm 310, the top of the head end of the main arm 310, the top of the tail end of the auxiliary arm 320 and the top of the head end of the auxiliary arm 320, and is in a freely hanging state after passing around the head end of the auxiliary arm 320.

[0054] At this time, the hoisting winch is made to loosen the hoisting rope 600, and the free end of the hoisting rope 600 is pulled toward the direction close to the crane body, and finally the free end of the hoisting rope 600 is connected to the crane body. Specifically, the crane body may include a chassis 100, a turntable 200, and a main arm 310, and the free end of the hoisting rope 600 may be connected to the chassis 100, the turntable 200, or the main arm 310.

[0055] In addition, the free end of the lifting rope 600 can also be fixed to the ground below the boom.

[0056] For example, the free end of the lifting rope 600 is connected to the chassis 100. When the free end of the lifting rope 600 is connected to the chassis 100, the main arm 310, the auxiliary arm 320 and the part of the lifting rope 600 located below the boom form a triangular structure.

[0057] Step S200, retrieving the lifting rope 600, the lifting rope 600 pulls the head end of the auxiliary arm 320 to move toward the direction close to the main body of the working machine, and the tail end of the auxiliary arm 320 pushes up the head end of the main arm 310.

[0058] In this step, the lifting winch is used to recover the lifting rope 600. Since the lengths of the main arm 310 and the auxiliary arm 320 are fixed, during the process of recovering the lifting rope 600, the portion of the lifting rope 600 located below the boom is shortened, and the lifting rope 600 drives the head end of the auxiliary arm 320 to move toward the direction close to the chassis 100 of the crawler crane. At the same time, the head end of the main arm 310 and the tail end of the auxiliary arm 320 move upward, and the angle between the main arm 310 and the auxiliary arm 320 becomes smaller, thereby realizing the action of raising the main arm 310.

[0059] At the same time, the main luffing winch in the main luffing mechanism tightens the main arm traction rope 430, so that the main luffing mast 410 always keeps the main arm traction member 420 in a tightened state. Alternatively, the main luffing winch can exert force at the same time, so that the main arm traction rope 430 pulls the main luffing mast 410 to rotate backward, and then the main arm traction member 420 drives the main arm 310 to lift. At this time, the main luffing mechanism and the lifting mechanism drive the main arm 310 to lift at the same time.

[0060] The arm raising method provided by the present invention, when a large pulling force is required at the initial stage of arm raising, utilizes the large pulling force of the lifting mechanism to make the lifting mechanism replace the main luffing mechanism to drive the main arm 310 to be raised alone, or perform the arm raising action together with the main luffing mechanism, so that the lifting mechanism is no longer in an idle state, and resources are reasonably used. Furthermore, the design pulling force of the main luffing mechanism can be appropriately reduced, so that the manufacturing cost of the main luffing mechanism is reduced.

[0061] In an embodiment provided by the present invention, when lifting the main arm 310, the lifting mechanism can play an auxiliary role to assist the main luffing mechanism in lifting the main arm 310. Therefore, step S100 also includes the main luffing mechanism of the working machine lifting the main arm 310.

[0062] In this embodiment, when the boom is raised, the main luffing mechanism still plays a major role. The boom raising process is as follows:

[0063] The main luffing winch recovers the main boom traction rope 430, and the main boom traction rope 430 drives the main luffing mast 410 to rotate backward, and the main luffing mast 410 drives the main boom 310 to rotate upward through the main boom traction member 420. At the same time, the lifting winch recovers the lifting rope 600, and together with the main luffing mechanism, lifts the main boom 310.

[0064] At this time, the main luffing mechanism and the lifting mechanism lift the main arm 310 at the same time. The lifting mechanism provides a part of the pulling force to lift the main arm 310, which can effectively avoid the main luffing mechanism providing all the arm-raising pulling force. It can also appropriately reduce the design pulling force of the main luffing mechanism and reduce the manufacturing cost of the main luffing mechanism.

[0065] Due to their own structures, the existing main arm 310 and the auxiliary arm 320 cannot rotate relative to each other to a state where they fit together, and there is a limit angle between them, for example, the limit angle can be 60 degrees. When the angle between the main arm 310 and the auxiliary arm 320 reaches the limit angle, if the main arm 310 and the auxiliary arm 320 continue to be forced to rotate in a direction close to each other, the main arm 310 and the auxiliary arm 320 will be damaged.

[0066] Therefore, in one embodiment provided by the present invention, when the lifting mechanism drives the main arm 310 to rotate until the main arm 310 and the auxiliary arm 320 reach a preset angle, the following steps are performed:

[0067] Step S300, stop the action of recovering the lifting rope 600;

[0068] Step S400, fixing the angle between the main arm 310 and the auxiliary arm 320;

[0069] Step S500: releasing the free end of the lifting rope 600.

[0070] First, in order to prevent the angle between the main arm 310 and the auxiliary arm 320 from continuing to narrow, the lifting winch is stopped to recover the lifting rope 600. At this time, the free end of the lifting rope 600 is still connected to the chassis 100, and the main arm 310 and the auxiliary arm 320 can still be restricted from rotating relative to each other in the direction of increasing the angle.

[0071] Then, the angles of the main arm 310 and the auxiliary arm 320 are fixed, and after fixing, the free end of the lifting rope 600 is separated from the ground or the crane body, and then the main arm 310 is pulled by the main luffing mechanism alone to continue lifting. At this time, since the center of the entire boom is close to the turntable 200, a large pulling force is not required to pull the main arm 310 to rotate, and the main luffing mechanism with reduced design pulling force can completely complete the remaining arm lifting action.

[0072] In this embodiment, an angle detection device can be set between the main arm 310 and the auxiliary arm 320. The angle detection device can be an angle sensor. The angle sensor is communicated with the control system of the crawler crane. When the angle sensor detects that the angle between the main arm 310 and the auxiliary arm 320 reaches a preset angle, the control system controls the lifting winch to stop recovering the lifting rope 600. The preset angle is greater than or equal to the limit angle to prevent the main arm 310 and the auxiliary arm 320 from excessive rotation, causing damage to the main arm 310 and the auxiliary arm 320.

[0073] At the same time, the control system also controls the main luffing mechanism to stop lifting the main arm 310. When the lifting action stops and the angle between the main arm 310 and the auxiliary arm 320 is fixed, the operator manually separates the free end of the lifting rope 600 from the ground or the crane body. After separation, the control system controls the main luffing mechanism to drive the main arm 310 and the auxiliary arm 320 to lift together until they are lifted to the main arm working position.

[0074] In addition, an electric control locking structure can be arranged between the free end of the hoist rope 600 and the crane body. When the control system receives an angle value less than or equal to a preset value from the angle sensor, the control system controls the electric control locking structure to automatically unlock, so that the free end of the hoist rope 600 is automatically separated from the chassis 100. The main luffing mechanism continues to work, which can effectively improve the boom raising efficiency.

[0075] In one embodiment of the present invention, the above-mentioned fixing of the angle between the main arm 310 and the auxiliary arm 320 includes the following steps:

[0076] Step S401: The auxiliary luffing mechanism tightens the auxiliary arm 320 so that the angle between the auxiliary arm 320 and the main arm 310 is greater than or equal to a preset angle.

[0077] After the auxiliary luffing mechanism tightens the auxiliary arm 320, when the main arm 310 is lifted, the auxiliary arm 320 no longer moves in the direction close to the crane body, but directly separates from the ground. At this time, the gravity on the auxiliary arm 320 and the pulling force provided by the auxiliary luffing mechanism form a pair of interaction forces, so that the angle between the auxiliary arm 320 and the main arm 310 is fixed, and when the main arm 310 is lifted, the auxiliary arm 320 is driven to move together. At this time, the angle between the main arm 310 and the auxiliary arm 320 is greater than the preset angle, which can prevent the auxiliary arm 320 from moving in the direction close to the main arm 310 under the action of gravity after separating from the ground, thereby causing the angle between the main arm 310 and the auxiliary arm 320 to continue to decrease, damaging the main arm 310 and the auxiliary arm 320.

[0078] In one embodiment of the present invention, after the auxiliary luffing mechanism tightens the auxiliary arm 320, the following steps need to be performed:

[0079] Step S600: the main luffing mechanism drives the main arm 310 and the auxiliary arm 320 to move to the main arm working position;

[0080] Step S700: The auxiliary luffing mechanism drives the auxiliary arm 320 to move to the auxiliary arm working position.

[0081] In this embodiment, the main luffing mechanism drives the main arm 310 and the auxiliary arm 320 to move together until they move to the main arm working position. At this time, the main luffing mechanism stops running and tightens the main arm 310 to keep the main arm 310 in the main arm working position.

[0082] When the main luffing mechanism stops working, the auxiliary luffing winch recovers the jib traction rope 550, so that the jib traction rope 550 drives the second auxiliary luffing mast 520 to rotate towards the first auxiliary luffing mast 510, and then the second auxiliary luffing mast 520 drives the head end of the jib 320 to move upward through the second jib traction member 540 until the jib 320 is lifted to the required height, at which time the entire boom raising action is completed.

[0083] In one embodiment of the present invention, a support device may be provided below the main arm 310. In the initial stage of raising the arm, the support device may be supported below the main arm 310, so that the main arm 310 remains substantially parallel to the ground, and the head end of the auxiliary arm 320 needs to extend forward and downward, so that the auxiliary arm 320 has a downward angle relative to the main arm 310. In other words, at this time, the angle between the bottom surface of the auxiliary arm 320 and the bottom surface of the main arm 310 is less than 180 degrees.

[0084] If the main arm 310 and the auxiliary arm 320 are both in a state parallel to the ground at this time, the main arm 310 and the auxiliary arm 320 are in a dead point position, and the lifting winch cannot drive the lifting rope 600 to be recovered, and thus the lifting action of the main arm 310 cannot be completed.

[0085] If the auxiliary arm 320 has an upward angle relative to the main arm 310 at this time, when the lifting rope 600 is recovered, the auxiliary arm 320 and the main arm 310 will rotate in the opposite directions relative to each other, causing the head end of the main arm 310 and the tail end of the auxiliary arm 320 to rotate downward. Not only will the lifting effect of the main arm 310 fail to be achieved, but in severe cases, the main arm 310 and the auxiliary arm 320 may be damaged.

[0086] In one embodiment of the present invention, the support device may be an external support device, such as a horse stool 700. By arranging the support device at the bottom of the arm frame, the angle between the auxiliary arm 320 and the ground can be increased. The larger the angle between the auxiliary arm 320 and the ground, the easier it is to raise the arm.

[0087] Alternatively, the support device may be a structure disposed below the main arm 310 , for example, the support device may be a support frame, the top of the support frame abuts against the main arm 310 , and the bottom of the support frame is used for supporting on the ground.

[0088] In order to ensure that the support frame can keep the main arm 310 parallel to the ground under various working conditions, the support frame may be a telescopic frame, and the support height of the support frame may be adjusted at any time.

[0089] Alternatively, the support frame may be slidably connected to the main arm 310 , and the support point may be adjusted by adjusting the relative position of the support frame and the main arm 310 , so that the main arm 310 is parallel to the ground.

[0090] At the same time, in order to prevent the extended support frame from hindering the lifting work during the normal operation of the crawler crane, the support frame can be set to a foldable structure. When it is necessary to support the main arm 310, the support frame is rotated to the working position. When the main arm 310 is lifted, the support frame is rotated to a position that fits the main arm 310.

[0091] In one embodiment of the present invention, in the early stage of boom raising, when the lifting height of the main arm 310 is low, the bottom end of the auxiliary arm 320 needs to slide along the ground. In order to reduce friction and prevent damage to the auxiliary arm 320, a sliding mechanism can be provided at the bottom of the head end of the auxiliary arm 320.

[0092] The sliding mechanism may be a pulley block provided at the bottom of the head end of the auxiliary arm 320, or may be an external trolley provided with pulleys.

[0093] The operating machinery provided by the present invention can be not only the above-mentioned crawler crane, but also any operating machinery including the above-mentioned boom structure, and can be raised using the above-mentioned boom raising method. For example, the operating machinery can also be a truck crane provided with the above-mentioned boom section structure.

[0094] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A boom raising method for raising a boom of an operating machine, wherein the boom comprises a main boom (310) and a secondary boom (320), wherein: include: The free end of the lifting rope (600) is passed forward and passed around the top of the main arm (310) and the top of the auxiliary arm (320) in turn, and then passed around the head end of the auxiliary arm (320), and then the free end of the lifting rope (600) is extended backward at the bottom of the boom and fixed to the main body of the working machine; The lifting rope (600) is recovered, and the lifting rope (600) pulls the head end of the auxiliary arm (320) to move in a direction close to the main body of the working machine, and the tail end of the auxiliary arm (320) pushes up the head end of the main arm (310); While the lifting rope (600) is being retrieved, the main luffing mechanism of the working machine lifts the main boom (310).

2. The arm raising method according to claim 1, characterized in that: When the angle between the main arm (310) and the auxiliary arm (320) reaches a preset angle, the following steps are performed: Stopping the action of recovering the lifting rope (600); Fixing the angle between the main arm (310) and the auxiliary arm (320); The free end of the lifting rope (600) is released.

3. The arm raising method according to claim 2, characterized in that: The fixing of the angle between the main arm (310) and the auxiliary arm (320) comprises: The auxiliary luffing mechanism tightens the auxiliary arm (320) so that the angle between the auxiliary arm (320) and the main arm (310) is greater than or equal to the preset angle.

4. The arm raising method according to claim 3, characterized in that: After the auxiliary luffing mechanism tightens the auxiliary arm (320), the following steps are also performed: The main luffing mechanism drives the main arm (310) and the auxiliary arm (320) to move to a main arm working position; The auxiliary luffing mechanism drives the auxiliary arm (320) to move to the auxiliary arm working position.

5. The arm raising method according to any one of claims 1 to 4, characterized in that: A supporting device is arranged below the main arm (310), and the supporting device is used to make the angle between the main arm (310) and the ground greater than or equal to zero before the arm is raised.

6. The arm raising method according to any one of claims 1 to 4, characterized in that: Before the arm is raised, the angle between the bottom surface of the auxiliary arm (320) and the bottom surface of the main arm (310) is less than 180 degrees.

7. The arm raising method according to any one of claims 1 to 4, characterized in that: A sliding mechanism is arranged below the head end of the auxiliary arm (320).

8. The arm raising method according to claim 2, characterized in that: The preset angle is greater than or equal to a limiting angle between the main arm (310) and the auxiliary arm (320).

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