Construction crane with self-locking capability

Abstract

The application relates to a construction site crane with self-locking capability, which comprises a driving device arranged at the top of a tower; one end of a lifting rope is wound around the output end of the driving device; a self-locking device is arranged at the top of the tower, and the other end of the lifting rope is connected with a lifting object through the self-locking device; the self-locking device comprises a mounting frame, a first locking piece, a tension detection mechanism and a first elastic piece; the mounting frame is provided with a first through hole, the other end of the lifting rope passes through the first through hole and is connected with the lifting object; the first locking piece is sleeved outside the lifting rope, the first locking piece has a first position of being inserted into the first through hole to lock the lifting rope and a second position of being separated from the first through hole to unlock the lifting rope; the tension detection mechanism is used for abutting against the lifting rope to detect the tension of the lifting rope and fixing the first locking piece at the second position when the lifting rope has the tension; and the first elastic piece is used for providing elastic force to the first locking piece to drive the first locking piece to move from the second position to the first position.

Description

TECHNICAL FIELD

[0001] The application belongs to the field of tower crane, and particularly relates to a tower crane with self-locking capacity. BACKGROUND

[0002] The tower crane for construction site is the most commonly used hoisting equipment on the construction site. With the change of the times, people's requirements for the tower crane for construction site are also getting higher and higher. The existing tower crane has the risk of falling of the hoisted goods. Therefore, the application provides a tower crane with self-locking capacity. SUMMARY

[0003] In view of the above problems, the application provides a tower crane with self-locking capacity, which can have self-locking capacity when the hoisted object falls.

[0004] The application provides a tower crane with self-locking capacity, which comprises a tower, a driving device, a hoisting rope and a self-locking device. The driving device is arranged at the top of the tower. One end of the hoisting rope is wound around the output end of the driving device. The self-locking device is arranged at the top of the tower, and the other end of the hoisting rope passes through the self-locking device and is connected with the hoisted object. The self-locking device comprises a mounting frame, a first locking member, a tension detection mechanism and a first elastic member. The mounting frame is provided with a first through hole, and the other end of the hoisting rope passes through the first through hole and is connected with the hoisted object. The first locking member is sleeved outside the hoisting rope and is slidably arranged in the mounting frame along the direction of gravity. The first locking member has a first position in which the first locking member is inserted into the first through hole to lock the hoisting rope and a second position in which the first locking member is separated from the first through hole to unlock the hoisting rope. The tension detection mechanism is used to abut against the hoisting rope to detect the tension of the hoisting rope and fix the first locking member at the second position when the hoisting rope has tension. The first elastic member is used to provide an elastic force to the first locking member to drive the first locking member to move from the second position to the first position.

[0005] In the above technical solution, the tension detection mechanism is arranged to detect the tension of the hoisting rope, so that when the part of the hoisting rope between the driving device and the self-locking device is broken to cause the tension of the hoisting rope to rapidly decrease, the first locking member is inserted into the first through hole (i.e. the first locking member is located at the first position) to make the first locking member clamped between the first through hole and the hoisting rope, so as to provide a larger friction force to the hoisting rope, thereby completing the self-locking of the hoisting rope and reducing the risk of falling of the hoisted object.

[0006] In some embodiments, the mounting frame comprises a bottom plate and a vertical plate, the thickness direction of the bottom plate is perpendicular to the direction of gravity, the vertical plate is connected with the bottom plate and extends along the direction of gravity, and the first through hole is located on the bottom plate; the first locking member comprises a first mounting plate and a first clamping member, the first mounting plate is movably arranged on the vertical plate and above the bottom plate, the first mounting plate has a second through hole corresponding to the first through hole, and the lifting rope passes through the second through hole and the first through hole in sequence; the first clamping member comprises a plurality of first sub-clamping members arranged at intervals along the circumference of the second through hole, one end of the first sub-clamping member is located in the second through hole, and the other end of the first sub-clamping member is a free end that can deform along the radial direction of the second through hole, when the first locking member is located at the first position, one end of the first clamping member is inserted into the first through hole, and when the first locking member is located at the second position, one end of the first clamping member is separated from the first through hole, and the outer diameter of the first clamping member is greater than the hole diameter of the first through hole.

[0007] In the above technical solution, since the outer diameter of the first clamping member is greater than the hole diameter of the first through hole, when the other end of the first clamping member is inserted into the first through hole, the first clamping member can deform towards the direction close to the axis of the first through hole, thereby improving the friction between the first sub-clamping member and the lifting rope. At the same time, since the first mounting plate is located above the bottom plate, the friction force exerted by the lifting rope on the first sub-clamping member can drive the other end of the first sub-clamping member to further insert into the first through hole, thereby further increasing the friction between the first sub-clamping member and the lifting rope and further reducing the risk of the lifting object falling.

[0008] In some embodiments, the outer diameter of the first clamping member gradually increases in the direction from the bottom plate to the vertical plate.

[0009] In the above technical solution, the outer diameter of the first clamping member gradually increases in the direction from the bottom plate to the vertical plate, thereby guiding the free end of the first sub-clamping member to deform towards the direction close to the lifting rope when the first sub-clamping member enters the first through hole to abut against the lifting rope.

[0010] In some embodiments, the construction site crane with self-locking capability further comprises a first roller rotatably arranged on the vertical plate, and a first locking member is arranged between the first roller and the bottom plate. The hoisting rope comprises a first segment and a second segment located on opposite sides of the rotation axis of the first roller in a first direction, and the second segment passes through the second through hole, the first through hole and is connected with the hoisted object, and the first direction is perpendicular to the direction of gravity. The tension detection mechanism comprises an abutting member, a transmission member and a second elastic member. The abutting member is movably arranged on the vertical plate in the first direction, and the abutting member abuts against the first segment in the direction in which the first segment points to the second segment. The transmission member is movably arranged on the bottom plate in the first direction, one end of the transmission member is connected with the abutting member, the first mounting plate is provided with a avoiding hole, the transmission member has a third position and a fourth position, in the third position, the other end of the transmission member abuts against the side of the first mounting plate facing the bottom plate, and in the fourth position, the other end of the transmission member passes through the avoiding hole. The second elastic member is used to drive the abutting member and the transmission member to move from the third position to the fourth position.

[0011] Specifically, when the construction site crane with self-locking capability is working normally, at this time the hoisting rope drives the hoisting member to move in the direction of gravity under the action of the driving force of the driving device, at this time the tension of the hoisting rope is large, when the abutting member abuts against the first segment of the hoisting rope under the action of the elastic force of the second elastic member, the deformation of the hoisting rope is small, the abutting member and the transmission member are located at the third position, the other end of the transmission member abuts against the side of the first mounting plate facing the bottom plate, so that the first mounting plate is located at the second position, at this time the first elastic member is in a stretched state to provide an elastic force to the first locking member.

[0012] When the hoisting rope between the driving device and the self-locking device is broken, the tension of the hoisting rope rapidly decreases, causing the second elastic member to drive the abutting member and the transmission member to move to the fourth position, thereby causing the other end of the transmission member to be inserted into the avoiding hole, so that the transmission member no longer interferes with the movement of the first mounting plate from the second position to the first position, and further causing the first locking member to move to the first position under the action of the first elastic member to complete the self-locking of the hoisting rope.

[0013] In some embodiments, the side of the transmission member facing the second segment is provided with a guide surface, and the distance between the guide surface and the second segment gradually decreases in the direction of the bottom plate pointing to the vertical plate.

[0014] In the above technical solution, by arranging the guide surface on the side of the transmission member facing the second segment, when the transmission member moves to the fourth position, the guide surface can abut against the edge of the avoiding hole away from the bottom plate to further guide the first locking member to move to the first position.

[0015] In some embodiments, the side of the transmission member facing the second segment is provided with a stepped surface connected with the guide surface and located below the guide surface, and the stepped surface is perpendicular to the direction of gravity. In the fourth position, the stepped surface abuts against the side of the first mounting plate away from the bottom plate.

[0016] In the above technical solution, when the fourth position is reached, the stepped surface abuts against the side of the first mounting plate away from the bottom plate. This limits the first locking member from disengaging the first through hole, thereby preventing the risk of the first locking member disengaging the first through hole due to the shaking of the hoisting rope, which would cause the self-locking to fail.

[0017] In some embodiments, the self-locking device further comprises a stall detection mechanism, a driving member, and a second locking member. The second locking member is sleeved outside the hoisting rope and is slidably arranged on the mounting frame in the direction of gravity. The second locking member has a fifth position in which it is inserted into the first through hole to lock the hoisting rope and a sixth position in which it disengages the first through hole to unlock the hoisting rope. The stall detection mechanism is configured to detect the speed of the hoisting rope and provide a first instruction to the driving member when the speed of the hoisting rope exceeds a first threshold. The driving member is configured to drive the second locking member to move from the sixth position to the fifth position upon receiving the first instruction.

[0018] In the above technical solution, by providing the stall detection mechanism, the driving member, and the second locking member, the hoisting rope can be self-locked when the driving device is damaged and the speed of the hoisting rope is out of control, thereby further increasing the reliability of the self-locking of the construction site crane with self-locking capability.

[0019] In some embodiments, the second locking member comprises a second mounting plate and a second clamping member. The second mounting plate is arranged at the output end of the driving member. The second mounting plate has a third through hole corresponding to the first through hole, and the hoisting rope passes through the third through hole. The second clamping member comprises a plurality of second sub-clamping members arranged at intervals along the circumference of the third through hole. One end of the second sub-clamping member is located within the third through hole, and the other end of the second sub-clamping member is a free end that can deform radially along the third through hole. When the second locking member is in the fifth position, one end of the second clamping member is inserted into the first through hole. When the second locking member is in the sixth position, one end of the second clamping member disengages the second through hole, and the outer diameter of the second clamping member is greater than the hole diameter of the first through hole.

[0020] In the above technical solution, the outer diameter of the second clamping member is greater than the hole diameter of the first through hole, so that when the other end of the second clamping member is inserted into the first through hole, it can deform towards the direction close to the axis of the first through hole, thereby improving the friction between the second sub-clamping member and the hoisting rope.

[0021] In some embodiments, the first mounting plate is located between the second mounting plate and the bottom plate. The hoisting rope passes through the third through hole, the second through hole, and the first through hole in sequence. The other end of the second sub-clamping member passes through the second through hole and is located between two adjacent first sub-clamping members. Along the circumference of the second through hole, the first sub-clamping members and the second sub-clamping members are arranged at intervals.

[0022] In the technical scheme, the second mounting plate is located above the bottom plate, the friction force applied by the hoisting rope to the second sub-clamping piece can drive the other end of the second sub-clamping piece to further insert into the second through hole, thereby further increasing the friction force between the second sub-clamping piece and the hoisting rope, and further reducing the risk of the hoisting object falling. Meanwhile, the first sub-clamping piece and the second sub-clamping piece are staggered and spaced, so that the speed failure self-locking and the tension failure self-locking of the self-locking device jointly occupy a part of the space without interfering with each other, thereby reducing the space volume occupied by the self-locking device.

[0023] In some embodiments, the outer diameter of the second clamping piece gradually increases in the direction of the bottom plate pointing to the vertical plate.

[0024] In the technical scheme, the outer diameter of the second clamping piece gradually increases in the direction of the bottom plate pointing to the vertical plate, so that when the second sub-clamping piece enters the first through hole, the free end of the second sub-clamping piece can be deformed in the direction close to the hoisting rope to abut against the hoisting rope. BRIEF DESCRIPTION OF DRAWINGS

[0025] In order to more clearly illustrate the technical scheme in the embodiments of the present application or the prior art, the drawings needed in the following embodiment or prior art description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0026] Figure 1 The structural schematic diagram of the construction site crane with self-locking capability provided by the embodiment of the present application;

[0027] Figure 2 The structural schematic diagram of the self-locking device provided by the embodiment of the present application;

[0028] Figure 3 The cross-sectional view of the self-locking device when the first locking piece is located at the second position and the second locking piece is located at the fourth position;

[0029] Figure 4 The cross-sectional view of the self-locking device when the first locking piece is located at the first position and the second locking piece is located at the fourth position;

[0030] Figure 5 The cross-sectional view of the self-locking device when the first locking piece is located at the first position and the second locking piece is located at the third position;

[0031] Figure 6 The cross-sectional view of the self-locking device when the first locking piece is located at the second position and the second locking piece is located at the third position.

[0032] 1000 - construction crane with self-locking capability; 100 - self-locking device;

[0033] 10 - mounting frame; 11 - bottom plate; 111 - first through hole; 12 - vertical plate; 20 - first locking member; 21 - first mounting plate; 211 - second through hole; 212 - avoiding hole; 22 - first clamping member; 22A - first sub-clamping member; 30 - tension detection mechanism; 31 - abutting member; 32 - transmission member; 321 - guide surface; 322 - stepped surface; 33 - sleeve; 40 - first elastic member; 50 - second locking member; 51 - second mounting plate; 52 - second clamping member; 52A - second sub-clamping member; 200 - tower; 300 - driving device; 400 - hoisting rope; 410 - first section; 420 - second section; 500 - first roller; X - direction of gravity; Y - first direction; DETAILED DESCRIPTION

[0034] The embodiments of the present application will be described in detail below with reference to the drawings.

[0035] In the description of the present application, it needs to be understood that the terms "center", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application.

[0036] The terms "first", "second", "third", etc. are only used for descriptive purpose, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first", "second", etc. can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "a plurality of" is two or more, unless otherwise specified.

[0037] In the description of the present application, it needs to be explained that, unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connection" should be understood in a broad sense, for example, it can be fixed connection, or detachable connection, or integrally connected; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through intermediate medium, or the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0038] Reference Figures 1-6The embodiment of the present application provides a crane with self-locking capability for a construction site, which comprises a tower, a driving device, a lifting rope and a self-locking device. The driving device is arranged on the top of the tower. One end of the lifting rope is wound on the output end of the driving device. The self-locking device is arranged on the top of the tower, and the other end of the lifting rope passes through the self-locking device and is connected with a lifting object. The self-locking device comprises a mounting frame, a first locking member, a tension detection mechanism and a first elastic member. The mounting frame is provided with a first through hole, and the other end of the lifting rope passes through the first through hole and is connected with the lifting object. The first locking member is sleeved outside the lifting rope and is slidably arranged on the mounting frame along the direction of gravity. The first locking member has a first position for locking the lifting rope by being inserted into the first through hole and a second position for unlocking the lifting rope by being separated from the first through hole. The tension detection mechanism is used for abutting against the lifting rope to detect the tension of the lifting rope and fixing the first locking member at the second position when the lifting rope has the tension. The first elastic member is used for providing an elastic force to the first locking member to drive the first locking member to move from the second position to the first position.

[0039] The driving device can be a driving motor with a winding drum on the output shaft.

[0040] The first elastic member can be a spring.

[0041] In the technical solution, the tension detection mechanism is arranged to detect the tension of the lifting rope, so that when the tension of the lifting rope is rapidly reduced due to the fracture of the part of the lifting rope between the driving device and the self-locking device, the first locking member is inserted into the first through hole (i.e. the first locking member is located at the first position) to make the first locking member clamped between the first through hole and the lifting rope, so that a larger friction force is provided to the lifting rope, and the self-locking of the lifting rope is completed, thereby reducing the risk of the falling of the lifting object.

[0042] According to some embodiments of the present application, the mounting frame comprises a bottom plate and a vertical plate. The thickness direction of the bottom plate is perpendicular to the direction of gravity. The vertical plate is connected with the bottom plate and extends along the direction of gravity. The first through hole is located on the bottom plate. The first locking member comprises a first mounting plate and a first clamping member. The first mounting plate is movably arranged on the vertical plate and located above the bottom plate. The first mounting plate has a second through hole corresponding to the first through hole. The lifting rope passes through the second through hole and the first through hole in sequence. The first clamping member comprises a plurality of first sub-clamping members which are arranged at intervals along the circumference of the second through hole. One end of the first sub-clamping member is located in the second through hole. The other end of the first sub-clamping member is a free end which can be deformed along the radial direction of the second through hole. When the first locking member is located at the first position, one end of the first clamping member is inserted into the first through hole. When the first locking member is located at the second position, one end of the first clamping member is separated from the first through hole. The outer diameter of the first clamping member is greater than the hole diameter of the first through hole.

[0043] In some embodiments, the first elastic member is a tension spring. The two ends of the first elastic member are respectively arranged on the first mounting plate and the bottom plate.

[0044] In the technical solution, the outer diameter of the first clamping member is greater than the hole diameter of the first through hole, so that when the other end of the first clamping member is inserted into the first through hole, the first clamping member can be deformed towards the direction close to the axis of the first through hole, thereby improving the friction between the first sub-clamping member and the lifting rope. At the same time, since the first mounting plate is located above the bottom plate, the friction force exerted by the lifting rope on the first sub-clamping member can drive the other end of the first sub-clamping member to further insert into the first through hole, thereby further increasing the friction between the first sub-clamping member and the lifting rope and further reducing the risk of the lifting object falling.

[0045] According to some embodiments of the present application, the outer diameter of the first clamping member gradually increases in the direction from the bottom plate to the vertical plate.

[0046] In the technical solution, the outer diameter of the first clamping member gradually increases in the direction from the bottom plate to the vertical plate, so that when the first sub-clamping member enters the first through hole, the free end of the first sub-clamping member can be deformed towards the direction close to the lifting rope to abut against the lifting rope.

[0047] According to some embodiments of the present application, the construction site crane with self-locking capability further comprises a first roller. The first roller is rotatably arranged on the vertical plate, and the first locking member is located between the first roller and the bottom plate. The lifting rope comprises a first segment and a second segment located on opposite sides of the rotation axis of the first roller in the first direction, and the second segment passes through the second through hole and the first through hole and is connected with the lifting object. The first direction is perpendicular to the direction of gravity. The tension detection mechanism comprises an abutting member, a transmission member and a second elastic member. The abutting member is movably arranged on the vertical plate in the first direction, and the abutting member abuts against the first segment in the direction from the first segment to the second segment. The transmission member is movably arranged on the bottom plate in the first direction, one end of the transmission member is connected with the abutting member, the first mounting plate is provided with a avoiding hole, the transmission member has a third position and a fourth position, in the third position, the other end of the transmission member abuts against the side of the first mounting plate facing the bottom plate, and in the fourth position, the other end of the transmission member passes through the avoiding hole. The second elastic member is used to drive the abutting member and the transmission member to move from the third position to the fourth position.

[0048] The second elastic member can be a spring. In some embodiments, the tension detection mechanism comprises a sleeve, the sleeve is mounted on the vertical plate, the axis of the sleeve is parallel to the first direction, one end of the abutting member passes through the sleeve, the second elastic member is sleeved outside the abutting member and located in the sleeve, one end of the second elastic member is connected with the inner wall of the sleeve, and the other end of the second elastic member is connected with the abutting member.

[0049] Specifically, when the site crane with self-locking capability is in normal operation, at this time the lifting rope drives the lifting piece to move along the direction of gravity under the driving force of the driving device, at this time the tension of the lifting rope is large, when the abutting piece abuts against the first section of the lifting rope under the elastic force of the second elastic piece, the deformation of the lifting rope is small, the abutting piece and the transmission piece are located at the third position, the other end of the transmission piece abuts against the side of the first mounting plate facing the bottom plate, so that the first mounting plate is located at the second position, at this time the first elastic piece is in a stretched state to provide an elastic force to the first locking piece.

[0050] When the lifting rope between the driving device and the self-locking device is broken, the tension of the lifting rope rapidly decreases, causing the second elastic piece to drive the abutting piece and the transmission piece to move to the fourth position, thereby causing the other end of the transmission piece to be inserted into the avoiding hole, so that the transmission piece no longer interferes with the movement of the first mounting plate from the second position to the first position, and further causing the first locking piece to move to the first position under the action of the first elastic piece to complete the self-locking of the lifting rope.

[0051] According to some embodiments of the present application, the side of the transmission piece facing the second section is provided with a guide surface, and the distance between the guide surface and the second section gradually decreases in the direction of the vertical plate pointing to the bottom plate.

[0052] In the technical solution, the guide surface is arranged on the side of the transmission piece facing the second section, so that when the transmission piece moves to the fourth position, the guide surface can abut against the edge of the avoiding hole away from the bottom plate to further guide the first locking piece to move to the first position.

[0053] According to some embodiments of the present application, the side of the transmission piece facing the second section is provided with a stepped surface connected with the guide surface and located below the guide surface, and the stepped surface is perpendicular to the direction of gravity, and at the fourth position, the stepped surface abuts against the side of the first mounting plate away from the bottom plate.

[0054] In the technical solution, at the fourth position, the stepped surface abuts against the side of the first mounting plate away from the bottom plate. This limits the first locking piece from disengaging the first through hole, preventing the risk of self-locking failure caused by the first locking piece disengaging the first through hole due to the shaking of the lifting rope.

[0055] According to some embodiments of the present application, the self-locking device further comprises a stall detection mechanism (not shown in the figure), a driving piece (not shown in the figure) and a second locking piece, the second locking piece is sleeved outside the lifting rope and is slidably arranged on the mounting frame in the direction of gravity, the second locking piece has a fifth position in which the second locking piece is inserted into the first through hole to lock the lifting rope and a sixth position in which the second locking piece disengages the first through hole to unlock the lifting rope; the stall detection mechanism is used to detect the speed of the lifting rope, and when the speed of the lifting rope exceeds a first threshold value, the stall detection mechanism provides a first instruction to the driving piece, and the driving piece is used to drive the second locking piece to move from the sixth position to the fifth position after receiving the first instruction.

[0056] Exemplarily, the stall detection mechanism comprises a tachometer and a controller, the tachometer is installed on the vertical plate and used for measuring the speed of the hoisting rope and sending the measured real-time speed to the controller, and the controller is electrically connected with the driving member.

[0057] The driving member can be an electric telescopic rod or a magnetic attraction coil. Taking the magnetic attraction coil as an example, the core of the magnetic attraction coil is connected with the second mounting plate, and the core of the magnetic attraction coil controls the extension and retraction of the second mounting plate to control the movement of the second mounting plate along the direction of gravity.

[0058] In the technical solution, the stall detection mechanism, the driving member and the second locking member are arranged to self-lock the hoisting rope when the driving device is damaged and the speed of the hoisting rope is out of control, thereby further improving the reliability of the self-locking of the construction site crane with self-locking capability.

[0059] According to some embodiments of the present application, the second locking member comprises a second mounting plate and a second clamping member, the second mounting plate is arranged at the output end of the driving member, the second mounting plate has a third through hole corresponding to the first through hole, and the hoisting rope passes through the third through hole; the second clamping member comprises a plurality of second sub-clamping members arranged at intervals along the circumference of the third through hole, one end of the second sub-clamping member is located in the third through hole, and the other end of the second sub-clamping member is a free end that can deform along the radial direction of the third through hole, when the second locking member is located at the fifth position, one end of the second clamping member is inserted into the first through hole, when the second locking member is located at the sixth position, one end of the second clamping member is separated from the second through hole, and the outer diameter of the second clamping member is greater than the hole diameter of the first through hole.

[0060] In the technical solution, the outer diameter of the second clamping member is greater than the hole diameter of the first through hole, so that when the other end of the second clamping member is inserted into the first through hole, the second clamping member can deform towards the direction close to the axis of the first through hole, thereby improving the friction between the second sub-clamping member and the hoisting rope.

[0061] According to some embodiments of the present application, the first mounting plate is located between the second mounting plate and the bottom plate, the hoisting rope passes through the third through hole, the second through hole and the first through hole in sequence, the other end of the second sub-clamping member passes through the second through hole and is located between two adjacent first sub-clamping members, and the first sub-clamping members and the second sub-clamping members are arranged at intervals and staggered along the circumference of the second through hole.

[0062] In the technical solution, the friction force applied by the hoisting rope to the second sub-gripping piece can drive the other end of the second sub-gripping piece to further insert into the second through hole, thereby further increasing the friction force between the second sub-gripping piece and the hoisting rope, and further reducing the risk of the hoisting object falling. Meanwhile, the first sub-gripping piece and the second sub-gripping piece are staggered and spaced, so that the speed failure self-locking and the tension failure self-locking of the self-locking device jointly occupy a part of the space without interfering with each other, thereby reducing the space volume occupied by the self-locking device.

[0063] According to some embodiments of the present application, the outer diameter of the second gripping piece gradually increases in the direction of the vertical plate from the bottom plate.

[0064] In the technical solution, the outer diameter of the second gripping piece gradually increases in the direction of the vertical plate from the bottom plate, so that when the second sub-gripping piece enters the first through hole, the free end of the second sub-gripping piece can be deformed in the direction close to the hoisting rope to abut against the hoisting rope.

[0065] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict.

[0066] The above embodiments are only used to illustrate the technical solutions of the present application and are not used to limit the present application. For those skilled in the art, the present application can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A construction site crane with self-locking capability, characterized by, The crane includes: a tower; a driving device arranged at the top of the tower; a hoisting rope, one end of which is wound on the output end of the driving device; a self-locking device arranged at the top of the tower, the other end of the hoisting rope passing through the self-locking device and being connected with a hoisted object; the self-locking device includes a mounting frame, a first locking member, a tension detection mechanism and a first elastic member, the mounting frame is provided with a first through hole, the other end of the hoisting rope passes through the first through hole and is connected with the hoisted object; the first locking member is sleeved outside the hoisting rope and is slidably arranged in the mounting frame in the direction of gravity, the first locking member has a first position for inserting into the first through hole to lock the hoisting rope and a second position for disengaging from the first through hole to unlock the hoisting rope; the tension detection mechanism is used for abutting against the hoisting rope to detect the tension of the hoisting rope and fixing the first locking member at the second position when the hoisting rope has tension; the first elastic member is used for providing an elastic force to the first locking member to drive the first locking member to move from the second position to the first position; the mounting frame includes a bottom plate and a vertical plate, the thickness direction of the bottom plate is perpendicular to the direction of gravity, the vertical plate is connected with the bottom plate and extends in the direction of gravity, and the first through hole is located on the bottom plate; the first locking member includes a first mounting plate and a first clamping member, the first mounting plate is movably arranged on the vertical plate and located above the bottom plate, the first mounting plate has a second through hole corresponding to the first through hole, and the hoisting rope passes through the second through hole and the first through hole in sequence; the first clamping member includes a plurality of first sub-clamping members arranged at intervals in the circumferential direction of the second through hole, one end of the first sub-clamping member is located in the second through hole, the other end of the first sub-clamping member is a free end which can deform in the radial direction of the second through hole, when the first locking member is located at the first position, one end of the first clamping member is inserted into the first through hole, when the first locking member is located at the second position, one end of the first clamping member is disengaged from the first through hole, and the outer diameter of the first clamping member is greater than the hole diameter of the first through hole; the crane with self-locking capability further includes: a first roller rotatably arranged on the vertical plate, the first locking member is located between the first roller and the bottom plate, the hoisting rope includes a first section and a second section located on opposite sides of the rotation axis of the first roller in a first direction, the second section passes through the second through hole, the first through hole and is connected with the hoisted object, and the first direction is perpendicular to the direction of gravity; the tension detection mechanism includes: an abutting member movably arranged on the vertical plate in the first direction, the abutting member abuts against the first section in the direction of the first section pointing to the second section. A transmission member movably arranged on the bottom plate along the first direction, one end of the transmission member being connected with the abutting member, the first mounting plate being provided with a avoiding hole, the transmission member having a third position and a fourth position, at the third position, the other end of the transmission member abutting against the side of the first mounting plate facing the bottom plate, at the fourth position, the other end of the transmission member passing through the avoiding hole; A second elastic member for driving the abutting member and the transmission member to move from the third position to the fourth position.

2. A site crane with self-locking capability according to claim 1, characterized in that, The outer diameter of the first clamping member gradually increases along the direction of the bottom plate pointing to the vertical plate.

3. A site crane with self-locking capability according to claim 1, characterized in that, The side of the transmission member facing the second section is provided with a guide surface, the distance between the guide surface and the second section gradually decreasing along the direction of the bottom plate pointing to the vertical plate.

4. A site crane with self-locking capability according to claim 3, characterized in that, The side of the transmission member facing the second section is provided with a stepped surface connected with the guide surface and located below the guide surface, the stepped surface being perpendicular to the direction of gravity, at the fourth position, the stepped surface abutting against the side of the first mounting plate away from the bottom plate.

5. A site crane with self-locking capability according to claim 1, wherein The self-locking device further comprises: A stall detection mechanism, a driving member and a second locking member, the second locking member being sleeved on the hoisting rope and slidably arranged on the mounting frame along the direction of gravity, the second locking member having a fifth position in which the second locking member is inserted into the first through hole to lock the hoisting rope and a sixth position in which the second locking member is separated from the first through hole to unlock the hoisting rope, the stall detection mechanism being used for detecting the speed of the hoisting rope and providing a first instruction to the driving member when the speed of the hoisting rope exceeds a first threshold, the driving member being used for driving the second locking member to move from the sixth position to the fifth position after receiving the first instruction.

6. A site crane with self-locking capability according to claim 5, characterized in that, The second locking member comprises a second mounting plate and a second clamping member, the second mounting plate being arranged on the output end of the driving member, the second mounting plate having a third through hole corresponding to the first through hole, the hoisting rope passing through the third through hole; The second clamping member comprises a plurality of second sub-clamping members arranged at intervals along the circumference of the third through hole, one end of the second sub-clamping member being located in the third through hole, the other end of the second sub-clamping member being a free end capable of deforming along the radial direction of the third through hole, at the fifth position of the second locking member, one end of the second clamping member is inserted into the first through hole, at the sixth position of the second locking member, one end of the second clamping member is separated from the second through hole, and the outer diameter of the second clamping member is greater than the hole diameter of the first through hole.

7. A site crane with self-locking capability according to claim 6, characterized in that, The first mounting plate is located between the second mounting plate and the bottom plate, the hoisting rope sequentially passes through the third through hole, the second through hole and the first through hole, the other end of the second sub-clamping member passes through the second through hole and is located between two adjacent first sub-clamping members, along the circumference of the second through hole, the first sub-clamping members and the second sub-clamping members are arranged at intervals.

8. A site crane with self-locking capability according to claim 7, characterized in that, The outer diameter of the second clamping member gradually increases along the direction of the bottom plate pointing to the vertical plate.

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