CN214935542U - Transfer arm, folding arm support and crane - Google Patents

Abstract

The utility model relates to a hoist technical field provides a switching arm, folding cantilever crane and hoist. The adapter arm comprises a first side surface and a second side surface along the length direction of the adapter arm, the first side surface and the second side surface are arranged oppositely, the width of the first side surface is larger than that of the second side surface, and a first support rod is installed at one end of the second side surface along the length direction. The two ends of the first side face are respectively used for being rotatably connected with a lower knuckle arm and a middle knuckle arm of the folding arm support, a first driving device is installed on the lower knuckle arm, a second driving device is installed on the middle knuckle arm, and the two ends of the second side face are respectively used for being rotatably connected with the first driving device and the second driving device. When the foldable boom is installed on a crane, the sectional installation or dismantling of the boom is not needed, the assembly and disassembly efficiency of the boom is greatly improved, and the labor and the transportation cost are saved.

Description

Transfer arm, folding arm support and crane

Technical Field

The utility model relates to a hoist technical field especially relates to a switching arm, folding cantilever crane and hoist.

Background

At present, the engineering machinery industry has higher and higher requirements on the transportation of the crawler crane, and certain requirements are provided for the convenience and simplicity of transportation and installation of the crawler crane after the crawler crane is disassembled. When the traditional crawler crane boom is installed and dismantled, a plurality of sections of the boom need to be installed and dismantled in a segmented mode by cooperation of a plurality of persons on site, generally, at least half a day or even several days are needed from starting to completing installation, the same long time is needed from shutdown to dismantling and loading, the assembling and disassembling process is complex and low in efficiency, and therefore transition efficiency is very low, and working efficiency is affected.

SUMMERY OF THE UTILITY MODEL

The utility model provides a switching arm, folding cantilever crane and hoist for solve the crawler crane among the prior art and need install and remove the segmentation to the cantilever crane and lead to installing and removing inefficiency, influence work efficiency's problem.

The utility model provides a switching arm, include the edge the length direction's of switching arm first side and second side, first side with the second side sets up relatively, the width of first side is greater than the width of second side, the second side is followed first vaulting pole is installed to the length direction's of switching arm one end.

The utility model provides a folding cantilever crane, including lower section arm, middle section arm and above-mentioned switching arm, rotatable mounting has first drive arrangement on the lower section arm, rotatable mounting has second drive arrangement on the middle section arm, the both ends of first side respectively with lower section arm with middle section arm rotatable coupling, the both ends of second side respectively with first drive arrangement with second drive arrangement's drive end rotatable coupling, lower section arm with middle section arm can dismantle the connection through first round pin axle, so that middle section arm can be relative lower section arm is folded and is expanded.

According to the utility model provides a pair of folding cantilever crane, one side of lower section arm is fixed with the second vaulting pole, the second vaulting pole is used for working as middle section arm is relative the switching arm rotates to support behind the fold condition in lower section arm with between the middle section arm.

According to the utility model provides a folding arm frame, install first limit switch and second limit switch on the lower arm, first limit switch is used for detecting when folding the arm frame that the drive end of first drive arrangement stretches out in place, second limit switch is used for detecting when extending the arm frame that the drive end of first drive arrangement contracts in place;

and/or a third limit switch and a fourth limit switch are mounted on the middle arm, the third limit switch is used for detecting that the driving end of the second driving device extends out to the first position when the arm support is folded, and the fourth limit switch is used for detecting that the driving end of the second driving device retracts to the first position when the arm support is extended.

According to the utility model provides a pair of folding cantilever crane still includes extra long festival arm and upper segment arm, the both ends of extra long festival arm respectively with middle festival arm with the upper segment arm is connected, one side of extra long festival arm with middle festival arm rotatable coupling, the opposite side of extra long festival arm with middle festival arm can dismantle the connection through second round pin axle, so that extra long festival arm can be relative middle festival arm is folded and is expanded.

According to the utility model provides a pair of folding cantilever crane, install fifth limit switch on the middle section arm, fifth limit switch is used for detecting add long section arm with it is folding to target in place to add the section arm.

The utility model also provides a crane, including host computer and any kind of above-mentioned folding cantilever crane, lower festival arm with host computer rotatable coupling.

According to the utility model provides a pair of hoist still includes the third vaulting pole, the third vaulting pole is used for working when lower section arm is in the horizontality support in the host computer with between the lower section arm.

According to the utility model provides a pair of crane, install sixth limit switch on the host computer, the one end of third vaulting pole with lower festival arm fixed connection, the host computer is equipped with the constant head tank, works as when lower festival arm is in the horizontality, the other end of third vaulting pole is located in the constant head tank, sixth limit switch is used for detecting the other end of third vaulting pole is located in the constant head tank.

According to the utility model provides a crane, still include A type frame, seventh limit switch and eighth limit switch, A type frame with host computer rotatable coupling, seventh limit switch is used for detecting when folding the cantilever crane A type frame and folds to target in place, eighth limit switch is used for detecting when extending the cantilever crane A type frame and expandes to target in place;

and/or a ninth limit switch is mounted on the middle arm, and the ninth limit switch is used for detecting that the driving end of the second driving device extends out to a second position when the arm support is folded;

and/or a tenth limit switch is installed on the middle section arm and used for detecting that the driving end of the second driving device retracts to a third position when the arm support extends.

Drawings

In order to more clearly illustrate the technical solutions of the present invention or the prior art, the following briefly introduces the drawings required for the embodiments or the prior art descriptions, and obviously, the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

Fig. 1 is a schematic structural diagram of a transfer arm in a foldable arm support provided by the present invention;

fig. 2 is a schematic structural diagram of the folding arm support provided by the present invention;

FIG. 3 is a schematic view of the connection between the lower arm and the middle arm in FIG. 1;

fig. 4 is a schematic structural diagram of a middle joint arm of the crane provided by the invention in a first state;

fig. 5 is a schematic structural diagram of the middle joint arm of the crane provided by the invention in a second state;

FIG. 6 is a schematic structural diagram of a lower arm of a crane according to the present invention in a horizontal state;

fig. 7 is a schematic structural view of the intermediate arm of the crane provided by the present invention in a final folded state;

FIG. 8 is a schematic view of a positioning groove of the crane according to the present invention;

reference numerals:

1. folding the arm support; 11. A lower knuckle arm; 111. A second stay bar;

112. a support leg; 12. A transfer arm; 121. A first side surface;

122. a second side surface; 123. A first stay bar; 13. A middle joint arm;

14. a first driving device; 15. A second driving device; 16. A first pin shaft;

17. lengthening the knuckle arm; 18. An upper knuckle arm; 2. A host;

21. a type A frame; 22. A third stay bar; 23. A fourth brace bar;

24. and (6) positioning a groove.

Detailed Description

To make the objects, technical solutions and advantages of the present invention clearer, the drawings of the present invention are combined to clearly and completely describe the technical solutions of the present invention, and obviously, the described embodiments are some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

In the description of the embodiments of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "first," "second" … … "tenth" are used for the purpose of clearly indicating the numbering of the product parts and do not represent any substantial difference. The specific meaning of the above terms in the embodiments of the present invention can be understood by those skilled in the art according to specific situations.

The following describes the transfer arm, the folding boom and the crane provided by the present invention with reference to fig. 1 to 8.

As shown in fig. 1, which is a schematic structural diagram of the transfer arm provided by the present invention, the transfer arm 12 is used to connect the lower arm 11 and the middle arm 13 of the foldable arm support 1. Fig. 2 is a schematic structural view of the foldable boom support provided by the present invention, and fig. 3 is a schematic structural view of the connection between the lower arm and the middle arm in fig. 2.

The utility model provides an adapter arm 12 includes first side 121 and second side 122 along the length direction of adapter arm 12. The first side 121 and the second side 122 are disposed opposite to each other, the width of the first side 121 is greater than that of the second side 122, and a first stay 123 is installed at one end of the second side 122 along the length direction of the adapting arm 12. Further, the length of the first side 121 is smaller than the length of the second side 122. The second side surface 122 has one end extending into the interior of the lower arm 11 and the other end extending into the interior of the middle arm 13.

The length direction of the adapter arm 12 is the same as the length direction of the folded arm support in the unfolded state, the length directions of the first side surface 121 and the second side surface 122 are the same as the length direction of the adapter arm 12, and the width directions of the first side surface 121 and the second side surface 122 are perpendicular to the length direction of the adapter arm 12.

The first side 121 has two ends for rotatably connecting to the lower arm 11 and the middle arm 13, respectively. So that the intermediate link arm 13 can be folded or unfolded with respect to the lower link arm 11. One end of the first stay 123 is rotatably or fixedly connected to one end of the second side surface 122 near the lower link arm 11. When the intermediate link arm 13 is folded into position relative to the lower link arm 11, the other end of the first stay 123 is connected to the lower link arm 11 such that the first stay 123 is supported between the lower link arm 11 and the adaptor arm 12. The utility model provides a switching arm 12 can rotate folding back and form between the lower section arm 11 and support and be connected relatively lower section arm 11, improves the stability of folding cantilever crane transportation.

The utility model provides a folding cantilever crane, as shown in fig. 1 and fig. 2, this folding cantilever crane 1 includes lower festival arm 11, middle festival arm 13 and switching arm 12 of any one of the above-mentioned embodiments. A first drive means 14 is rotatably mounted on the lower arm 11 and a second drive means 15 is rotatably mounted on the intermediate arm 13. The first side surface 121 has both ends rotatably connected to the lower joint arm 11 and the middle joint arm 13, respectively, and the second side surface 122 has both ends rotatably connected to the driving ends of the first driving unit 14 and the second driving unit 15, respectively. Lower arm segment 11 and intermediate arm segment 13 are removably connected by a first pin 16 to allow intermediate arm segment 13 to fold and unfold relative to lower arm segment 11.

Specifically, as shown in fig. 1, the adapter arm 12 includes a first side 121 and a second side 122 opposite to each other, and as shown in fig. 3, the end joint on the upper side of the lower arm 11 and the end joint on the upper side of the middle arm 13 are hinged to the end joints on both ends of the first side 121, respectively. The end fitting on the underside of the lower arm segment 11 and the end fitting on the underside of the intermediate arm segment 13 are directly detachably connected by means of a first pin 16. When the arm support is in the extended state as shown in fig. 2, the middle joint arm 13 and the lower joint arm 11 are locked in rotation by the first pin 16. The fixed end of the first drive means 14 is rotatably mounted to the lower knuckle arm 11 and the fixed end of the second drive means 15 is rotatably mounted to the middle knuckle arm.

The distance between the first side 121 and the second side 122 is smaller than the widths of the lower arm 11 and the middle arm 13, that is, the second side 122 is located in the space surrounded by the connection of the lower arm 11 and the middle arm 13. The width of the first side surface 121 in the direction perpendicular to the length direction of the arm support corresponds to the width of the lower arm 11 and the middle arm 13, and the width of the second side surface 122 in the direction perpendicular to the length direction of the arm support is smaller than the width of a space defined by the lower arm 11 and the middle arm 13, and the second side surface can be deformed into a rod, that is, the section of the adapter arm 12 in the direction perpendicular to the length direction of the arm support can be trapezoidal or triangular.

The utility model also provides a hoist of installing this folding cantilever crane to this hoist explains its folding cantilever crane's step for example. When the crane carries out the cantilever crane folding, dismantle first round pin axle 16 earlier, then rotate around its pin joint with lower knuckle arm 11 through first drive arrangement 14 drive switching arm 12, drive middle knuckle arm 13 and overturn to first state relatively lower knuckle arm 11, as shown in fig. 4 do the utility model provides a middle knuckle arm of crane is in the schematic structure of first state. Then, the second driving device 15 drives the middle arm 13 to rotate around the hinge point with the transfer arm 12 to the second state, as shown in fig. 5, the middle arm of the crane is in the second state. Then, the folding is completed by the action of the lower knuckle arm 11 and the A-shaped frame 21. As shown in fig. 7, the utility model provides a structural schematic diagram of the intermediate arm of the crane in the final folded state, wherein the intermediate arm 13 is driven by the second driving device 15 from the first state to the final folded state, and the intermediate arm 13 is rotated many times. The process of extending the arm support is opposite to the process of folding the arm support, and is not described in detail herein.

The embodiment of the utility model provides a folding cantilever crane rotates with lower festival arm and middle festival arm respectively through the switching arm and is connected for middle festival arm can rotate in order to realize folding lower festival arm relatively. The crane provided with the folding arm support does not need to be installed or dismantled in sections. When the transition transportation is needed, the middle knuckle arm is rotated to a folded state relative to the lower knuckle arm; when the arm support is required to be used for operation, the middle knuckle arm can be unfolded to be in butt joint with the lower knuckle arm. Folding and extension are driven by the driving device, so that the assembly and disassembly efficiency of the arm support is greatly improved, and the labor and the transportation cost are saved. In addition, when the arm support is in an extension state, a stable triangular support structure is formed among the lower knuckle arm, the switching arm and the middle knuckle arm.

In the embodiment of the present invention, after the middle arm 13 is turned over to the first state relative to the lower arm 11, the first stay 123 is supported between the lower arm 11 and the adapting arm 12. One end of the first stay 123 can be rotatably or fixedly connected with the end joint of the adapter arm 12. After the transfer arm 12 rotates to the right position relative to the lower arm 11, the first driving device 14 stops driving the transfer arm 12 to rotate relative to the lower arm 11, and at this time, the other end of the first stay 123 is connected to the lower arm 11 through the pin.

If the first brace 123 is fixedly connected to the transfer arm 12, when the middle arm 13 is rotated to a certain position relative to the lower arm 11, the end of the first brace 123 far away from the transfer arm 12 is exactly opposite to a connection joint on the lower arm 11. After the middle joint arm 13 rotates to a certain position relative to the lower joint arm 11, one end of the first stay 123 far away from the transfer arm 12 is fixed to the lower joint arm 11 through a pin shaft, so that the first stay 123 is supported between the lower joint arm 11 and the transfer arm 12, and stable support is provided.

As shown in fig. 3, in the embodiment of the present invention, a second stay 111 is fixed to one side of the lower arm 11, and the second stay 111 is used for supporting between the lower arm 11 and the middle arm 13 when the middle arm 13 rotates to the folded state relative to the joint arm 12. When the second driving device 15 drives the middle joint arm 13 to rotate to be in a state of being parallel to the axis of the lower joint arm 11, the end of the second support rod 111 far away from the lower joint arm 11 is just against the side surface of the middle joint arm 13 so as to provide support for the middle joint arm 13 during transportation.

As shown in fig. 3, in the embodiment of the present invention, a leg 112 is fixed to one side of the lower arm 11, and the leg 112 is used for supporting between the ground and the lower arm 11 when the adapter arm 12 rotates relative to the lower arm 11. Wherein, the second stay 111 and the leg 112 are respectively disposed on two opposite sides of the lower arm 11.

Specifically, when the arm support needs to be folded, the first pin shaft 16 is firstly detached, the first driving device 14 drives the transfer arm 12 to enable the middle joint arm 13 to tend to be horizontal, the supporting leg 112 can be supported on the ground, and then the first driving device 14 continues to drive the transfer arm 12 to rotate until the middle joint arm 13 is turned to the first state. When the second driving device 15 is used to drive the middle joint arm 13 to rotate relative to the joint arm to the second state, the supporting leg 112 can still be supported on the ground.

In the embodiment of the present invention, the first driving device 14 and the second driving device 15 are linear driving devices, such as a linear oil cylinder, a linear air cylinder or an electric push rod.

The embodiment of the utility model provides an in, install first limit switch and second limit switch on the lower arm 11, first limit switch is used for detecting first drive arrangement's drive end when folding cantilever crane and stretches out and targets in place, and second limit switch is used for detecting when extending the cantilever crane first drive arrangement's drive end shrink targets in place. That is, the first limit switch is used to limit the rotation angle of the transfer arm 12 relative to the lower arm 11 when the arm support is folded, and the second limit switch is used to limit the rotation angle of the transfer arm 12 relative to the lower arm 11 when the arm support is extended.

As shown in fig. 4, in the process of folding the arm support, when the driving end of the first driving device 14 extends out to drive the middle arm 13 to turn over to the first state, the first limit switch is triggered, and the first driving device 14 is controlled to stop driving according to a signal of the first limit switch. In the process of extending the arm support, when the driving end of the first driving device 14 retracts to drive the middle joint arm 13 to rotate reversely to the first state, the second limit switch is triggered, and the first driving device 14 is controlled to stop driving according to a signal of the second limit switch.

The embodiment of the utility model provides an in, install third limit switch and fourth limit switch on the middle section arm 13, third limit switch is used for detecting second drive arrangement's drive end when folding cantilever crane and stretches out the first position, and fourth limit switch is used for detecting second drive arrangement's drive end when extending the cantilever crane and contracts the first position. When the driving end of the second drive is in the first position, the intermediate link arm 13 is in the second state.

As shown in fig. 5, in the process of folding the boom, when the driving end of the second driving device 15 extends out to drive the middle joint arm 13 to turn over to the second state, the third limit switch is triggered, and the second driving device 15 is controlled to stop driving according to a signal of the third limit switch, so that the first rotation of the middle joint arm 13 relative to the joint arm 12 in the process of folding the boom is completed. In the process of extending the arm support, when the driving end of the second driving device 15 retracts to drive the middle joint arm 13 to rotate reversely to the second state, the fourth limit switch is triggered, the second driving device 15 is controlled to stop driving according to a signal of the fourth limit switch, and the second rotation in the process of extending the arm support is completed. Wherein the second state is an intermediate state from the first state and the final folded state.

As shown in fig. 2, the utility model provides a folding cantilever crane still includes extra long festival arm 17 and upper segment arm 18, and the both ends of extra long festival arm 17 are connected with middle festival arm 13 and upper segment arm 18 respectively, and one side and middle festival arm 13 rotatable coupling of extra long festival arm 17, the opposite side and the middle festival arm 13 of extra long festival arm 17 can dismantle through the second round pin axle and be connected to make extra long festival arm can fold and expand middle festival arm 13 relatively. When the arm support is in the stretching state, the lengthened knuckle arm 17 and the middle knuckle arm 13 are rotationally locked through the second pin shaft.

The plane of rotation of the elongated knuckle arm 17 relative to the intermediate knuckle arm 13 is perpendicular to the plane of rotation of the intermediate knuckle arm 13 relative to the lower knuckle arm 11. For example, as shown in fig. 4, the plane of rotation of the intermediate link arm 13 with respect to the lower link arm 11 is parallel to the plane of the paper, and the plane of rotation of the elongated link arm 17 with respect to the intermediate link arm 13 is perpendicular to the plane of the paper. When the arm support is folded, the lengthened knuckle arm 17 can be folded laterally, then the first driving device 14 drives the transfer arm 12 to drive the middle knuckle arm 13, the lengthened knuckle arm 17 and the upper knuckle arm 18 to turn over to the state shown in fig. 4 in the anticlockwise direction, at this time, the transfer arm 12 rotates in place, and the middle knuckle arm 13 is in the first state. When the first limit switch is provided, the first limit switch is also triggered to control the first driving device 14 to stop driving.

Further, a fifth limit switch is mounted on the middle arm 13 and used for detecting that the lengthened arm 17 and the upper arm 18 are folded in place. Specifically, the fifth limit switch is installed on the folding side of the middle arm 13, and when the lengthened arm 17 and the upper arm 18 are folded laterally to a set distance and close to the fifth limit switch, the fifth limit switch is triggered, and the arm folding of the arm support is started according to a signal of the fifth limit switch, that is, the first driving device 14 is started to drive the transfer arm 12 to rotate.

Further, the utility model provides a folding cantilever crane still includes third drive arrangement (not shown in the figure), and third drive arrangement installs in middle section arm 13 for drive extension festival arm 17 rotates for middle section arm 13. The connection mode of the lengthened knuckle arm 17 and the middle knuckle arm 13 is the same as that of the middle knuckle arm 13 and the lower knuckle arm 11 through the transfer arm 12, and the details are not repeated herein.

The utility model also provides a hoist, this hoist include host computer 2 and above-mentioned arbitrary embodiment folding cantilever crane 1, lower festival arm 11 and host computer 2 rotatable coupling. The crane further comprises an A-shaped frame 21, the A-shaped frame 21 is rotatably connected with the main machine 2, and one end, far away from the main machine 2, of the lower knuckle arm 11 is connected with a front supporting arm of the A-shaped frame 21 through a pull rope.

After the intermediate knuckle arm 13 rotates to the second state relative to the adapter arm 12, the amplitude variation operation is performed, and the lower knuckle arm 11 is lifted through the a-shaped frame 21. Fig. 6 is a schematic structural view of the lower arm of the crane according to the present invention in a horizontal state. The state of the intermediate link arm 13 with respect to the lower link arm 11 shown in fig. 5 and 6 is the same, and is considered as the second state of the intermediate link arm 13.

The embodiment of the utility model provides a hoist still includes third vaulting pole 22, and third vaulting pole 22 is used for supporting when lower section arm 11 is in the horizontality between host computer 2 and lower section arm 11. From the state shown in fig. 5 to the state shown in fig. 6, the operation steps are that the main luffing is firstly performed, and the lower knuckle arm 11 is lifted to the horizontal state through the a-shaped frame 21 to prepare for the horizontal bending of the rear middle knuckle arm 13. When the lower arm 11 reaches the horizontal state, the luffing is stopped, and the third stay 22 is supported between the main unit 2 and the lower arm 11, so that the lower arm 11 is stabilized in the horizontal state.

The third stay bar 22 may be an independent component, the lower arm 11 and the main body 2 are both provided with stay bar connecting portions, and after the lower arm 11 is lifted, the third stay bar 22 is connected between the stay bar connecting portions of the main body 2 and the lower arm 11 through manual work.

The embodiment of the utility model provides an in, install sixth limit switch on the host computer 2, the one end and the lower festival arm 11 fixed connection of third vaulting pole 22, host computer 2 is equipped with constant head tank 24. As shown in fig. 8, the positioning groove structure of the crane according to the present invention is schematically shown, when the lower arm 11 is in the horizontal state, the other end of the third stay 22 is located in the positioning groove 24, and the sixth limit switch is used for detecting the other end of the third stay 22 is located in the positioning groove 24. When the other end of the third support rod 22 is located in the positioning groove 24, the sixth limit switch is triggered, the main amplitude of oscillation stops being received according to a signal of the sixth limit switch, the amplitude of oscillation is properly released, the other end of the third support rod 22 abuts against the bottom of the positioning groove 24, the gravity of the arm support is borne on the third support rod 22, and preparation is made for folding the A-shaped frame 21 at the back. In order to avoid interference between the middle knuckle arm 13 and a pull rope for connecting the A-shaped frame 21 and the lower knuckle arm 11 caused by continuously overturning the middle knuckle arm 13, the lower knuckle arm 11 is kept in a horizontal state through the third support rod 22 and then is subjected to amplitude releasing to enable the A-shaped frame 21 to lie prone downwards. After the a-shaped frame 21 is flatly laid to the hood of the main machine 2, the second driving device 15 continues to drive the middle knuckle arm 13 to rotate relative to the joint arm 12 until the middle knuckle arm 13 reaches the final folded state shown in fig. 7, that is, the middle knuckle arm 13 and the lower knuckle arm 11 are in the horizontal folded state.

Further, the crane provided by the embodiment further includes a seventh limit switch and an eighth limit switch, the a-frame 21 is rotatably connected to the main machine 2, the seventh limit switch is used for detecting that the a-frame 21 is folded to the position when the boom is folded, and the eighth limit switch is used for detecting that the a-frame 21 is unfolded to the position when the boom is extended.

In the process of folding the arm support, when the lower arm 11 is in a horizontal state, the A-shaped frame 21 is made to lie prone under the hood through amplitude amplification and amplitude amplification, and when the seventh limit switch is triggered, the amplitude amplification is stopped according to a signal of the seventh limit switch, so that the A-shaped frame 21 is folded.

In the process of extending the arm support, when the lower knuckle arm 11 is in a horizontal state, the second driving device 15 drives the middle knuckle arm 13 to rotate reversely to a second state, the A-shaped frame 21 is unfolded through amplitude contraction, when the eighth limit switch is triggered, the amplitude contraction is stopped according to a signal of the eighth limit switch, at this time, the pull rope between the A-shaped frame 21 and the lower knuckle arm 11 bears the gravity of the arm support, the unfolding operation of the A-shaped frame 21 is considered to be completed, at this time, the support of the third support rod 22 can be released, and the subsequent arm support unfolding operation is continued.

The ninth limit switch is installed on the middle arm 13, and is used for detecting that the driving end of the second driving device extends out to the second position when the arm support is folded, and at the moment, the middle arm 13 is in a final folded state. In the process of folding the arm support, when the intermediate arm 13 rotates relative to the joint arm 12 from the second state to the final folded state, the ninth limit switch is triggered, the second driving device 15 is controlled to stop driving according to a signal of the ninth limit switch, and the second rotation of the intermediate arm 13 relative to the joint arm 12 is completed, that is, the folding of the whole arm support is completed.

Further, a tenth limit switch is installed on the middle arm 13, and the tenth limit switch is used for detecting that the driving end of the second driving device retracts to the third position when the arm support extends, and at this time, the middle arm 13 is in the first state. In the process of extending the arm support, when the middle knuckle arm 13 rotates reversely relative to the joint arm 12, the tenth limit switch is triggered, and the second driving device 15 is controlled to stop driving according to a signal of the tenth limit switch. Wherein the first position is located between the second position and the third position.

Further, a plurality of fourth support rods 23 are fixed on the hood of the main machine 2 or the front support arm of the a-shaped frame 21, and after the arm frame is folded, the arm frame is supported between the hood and the middle knuckle arm 13, the lengthened knuckle arm 17 or the upper knuckle arm 18 through the plurality of fourth support rods 23.

When the crane provided by the utility model is used for folding the arm support, the rotation angle of the transfer arm 12 relative to the lower knuckle arm 11 is limited by the first limit switch, so as to position the middle knuckle arm 13 in the first state; the third limit switch and the ninth limit switch limit the rotation angle of the middle joint arm 13 relative to the joint arm 12, and the middle joint arm 13 is positioned in the second state and the final folding state respectively. Between the two folding steps of the middle knuckle arm 13, the lower knuckle arm 11 is lifted and leveled through the cooperation of the lower knuckle arm 11, the sixth limit switch and the third stay bar 22, and the lower knuckle arm 11 is kept in a horizontal state through the third stay bar 22; then through the cooperation of A type frame 21 and seventh limit switch, the operation of lying prone of A type frame 21 carries out, prevents that middle festival arm 13 from taking place to interfere with A type frame 21 and stay cord, realizes the automatic folding of cantilever crane. After the middle arm 13 is folded, the first stay bar 123 is supported between the lower arm 11 and the transfer arm 12, the second stay bar 111 is supported between the lower arm 11 and the middle arm 13, and the fourth stay bar 23 is supported between the hood and the middle arm 13, the lengthened arm 17 and the upper arm 18, so as to ensure the stability of the arm support in the transportation process.

In the extending process of the arm support, the middle joint arm 13 is limited to rotate reversely to the second state sequentially through the fourth limit switch, the A-shaped frame 21 is limited to extend to the right position through the eighth limit switch, the middle joint arm 13 is limited to rotate reversely to the first state through the tenth limit switch, the second limit switch is used for limiting the transfer arm 12 to drive the middle joint arm 13 to rotate reversely to be in butt joint with the lower joint arm 11, and the middle joint arm 13 is unfolded.

When the length of the arm support is short, the folding and the stretching steps can complete the folding and the stretching of the arm support, and the full-automatic folding of the arm support can be realized. When the length of the arm support is long, that is, when the lengthened knuckle arm 17 exists, before the arm support folding step, the lengthened knuckle arm 17 and the upper knuckle arm 18 can be folded towards the lateral direction of the middle knuckle arm 13 manually, and the fact that the lengthened knuckle arm 17 and the upper knuckle arm 18 are folded in place is judged through a fifth limit switch. After the arm support extending step, the lengthened joint arm 17 and the upper joint arm 18 are manually turned reversely to be in butt joint with the middle joint arm 13, and the whole arm support is unfolded.

The utility model provides a crane need not to demolish the cantilever crane from the host computer, can realize the bicycle transportation, is favorable to reducing the cost of transportation. In addition, the full-automatic folding of the arm support with a certain length can be met, the extending and folding operations of the arm support can be completed by one person, the labor cost is greatly reduced, each step of overturning operation can be automatically and accurately controlled, and the assembling and disassembling efficiency of the arm support is improved.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention in its corresponding aspects.

Claims (10)

1. The utility model provides a switching arm, its characterized in that includes and follows the length direction's of switching arm first side and second side, first side with the second side sets up relatively, the width of first side is greater than the width of second side, the second side is followed the length direction's of switching arm one end is installed first vaulting pole.

2. The foldable arm support is characterized by comprising a lower arm, a middle arm and the switching arm according to claim 1, wherein a first driving device is rotatably mounted on the lower arm, a second driving device is rotatably mounted on the middle arm, two ends of the first side face are respectively rotatably connected with the lower arm and the middle arm, two ends of the second side face are respectively rotatably connected with the first driving device and the driving end of the second driving device, and the lower arm and the middle arm are detachably connected through a first pin shaft, so that the middle arm can be folded and unfolded relative to the lower arm.

3. The folding arm support of claim 2, wherein a second stay is fixed to one side of the lower arm, and the second stay is used for being supported between the lower arm and the middle arm when the middle arm rotates to a folding state relative to the transfer arm.

4. The folding arm support according to claim 2, wherein a first limit switch and a second limit switch are mounted on the lower arm, the first limit switch is used for detecting that the driving end of the first driving device extends to the right position when the arm support is folded, and the second limit switch is used for detecting that the driving end of the first driving device retracts to the right position when the arm support is extended;

and/or a third limit switch and a fourth limit switch are mounted on the middle arm, the third limit switch is used for detecting that the driving end of the second driving device extends out to the first position when the arm support is folded, and the fourth limit switch is used for detecting that the driving end of the second driving device retracts to the first position when the arm support is extended.

5. The folding arm support of claim 2, further comprising an elongated knuckle arm and an upper knuckle arm, wherein two ends of the elongated knuckle arm are respectively connected with the middle knuckle arm and the upper knuckle arm, one side of the elongated knuckle arm is rotatably connected with the middle knuckle arm, and the opposite side of the elongated knuckle arm is detachably connected with the middle knuckle arm through a second pin shaft, so that the elongated knuckle arm can be folded and unfolded relative to the middle knuckle arm.

6. The folding arm support of claim 5, wherein a fifth limit switch is mounted on the middle arm, and the fifth limit switch is used for detecting that the lengthened arm and the upper arm are folded in place.

7. A crane, characterized by comprising a main machine and a folding arm support according to any one of claims 2-6, wherein the lower arm is rotatably connected with the main machine.

8. The crane of claim 7 further comprising a third brace for supporting between the main machine and the lower knuckle arm when the lower knuckle arm is in a horizontal position.

9. The crane according to claim 8, wherein a sixth limit switch is installed on the main frame, one end of the third stay bar is fixedly connected with the lower arm, the main frame is provided with a positioning groove, when the lower arm is in a horizontal state, the other end of the third stay bar is located in the positioning groove, and the sixth limit switch is used for detecting that the other end of the third stay bar is located in the positioning groove.

10. The crane according to claim 8, further comprising an a-frame rotatably connected to the main frame, a seventh limit switch for detecting that the a-frame is folded in place when the boom is folded, and an eighth limit switch for detecting that the a-frame is unfolded in place when the boom is extended;

and/or a ninth limit switch is mounted on the middle arm, and the ninth limit switch is used for detecting that the driving end of the second driving device extends out to a second position when the arm support is folded;

and/or a tenth limit switch is installed on the middle section arm and used for detecting that the driving end of the second driving device retracts to a third position when the arm support extends.

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