CN113003442A

CN113003442A - Automatic tensioning device for traction rope of tower crane load-carrying trolley and tower crane

Info

Publication number: CN113003442A
Application number: CN202110327325.0A
Authority: CN
Inventors: 伍伟; 李桂芳; 宾英
Original assignee: Zoomlion Heavy Industry Science and Technology Co Ltd; Zoomlion Construction Crane Co Ltd
Current assignee: Zoomlion Heavy Industry Science and Technology Co Ltd; Zoomlion Construction Crane Co Ltd
Priority date: 2021-03-26
Filing date: 2021-03-26
Publication date: 2021-06-22

Abstract

The invention relates to the field of tower cranes, and discloses an automatic tensioning device for a traction rope of a tower crane load-carrying trolley and a tower crane. Wherein the automatic tensioning device comprises: the ratchet mechanism is arranged on the load-carrying trolley and is used for winding the traction rope; the movable collision block is hinged on an arm support of the tower crane; the movable collision block and the ratchet mechanism are configured to drive the ratchet mechanism to tension the traction rope when the load-carrying trolley moves along the forward direction of the arm support and the ratchet mechanism is in contact with the movable collision block; when the load-carrying trolley moves reversely along the arm support and the ratchet mechanism is in contact with the movable collision block, the ratchet mechanism can drive the movable collision block to rotate so as to prevent the movable collision block from preventing the load-carrying trolley from moving reversely. The technical scheme provided by the invention improves the operation safety and convenience of the tensioning operation of the traction rope.

Description

Automatic tensioning device for traction rope of tower crane load-carrying trolley and tower crane

Technical Field

The invention relates to the field of tower cranes, in particular to an automatic tensioning device for a traction rope of a load trolley of a tower crane, and further relates to the tower crane.

Background

The tower crane comprises an arm support and a load-carrying trolley arranged on the arm support, after the load-carrying trolley is used for a period of time, a traction rope (generally an amplitude-variable steel wire rope) on the load-carrying trolley is easy to loosen, and when the traction rope is loosened to a certain degree, a safety brake of the load-carrying trolley swings upwards to interfere with a boom web member, so that the load-carrying trolley and the boom web member are easy to damage. And after the hauling cable is loosened, the amplitude limiting of the load-carrying trolley is inaccurate, so that the accurate positioning of the amplitude of the load-carrying trolley is influenced, and the accurate positioning of the hoisted object is further influenced.

Therefore, after the tension device is used for a period of time, the traction rope needs to be manually tensioned, a worker needs to climb the tower crane, detach the tension wrench and the ratchet lock pin of the lower trolley and manually tension the ratchet of the load-carrying trolley, and the tension device is unsafe to operate and wastes time and labor. The existing tensioning methods therefore have the problem of being inconvenient and unsafe.

Disclosure of Invention

The invention aims to overcome the technical problems in the prior art, and provides an automatic traction rope tensioning device for a tower crane load-carrying trolley, which is used for improving the operation safety and convenience of traction rope tensioning operation.

In order to achieve the above object, a first aspect of the present invention provides an automatic tensioning device for a hauling rope of a tower crane load-carrying trolley, comprising:

the ratchet mechanism is arranged on the load-carrying trolley and is used for winding the traction rope;

the movable collision block is hinged on an arm support of the tower crane;

the movable collision block and the ratchet mechanism are configured to drive the ratchet mechanism to tension the traction rope when the load-carrying trolley moves along the forward direction of the arm support and the ratchet mechanism is in contact with the movable collision block; when the load-carrying trolley moves reversely along the arm support and the ratchet mechanism is in contact with the movable collision block, the ratchet mechanism can drive the movable collision block to rotate so as to prevent the movable collision block from preventing the load-carrying trolley from moving reversely.

Preferably, the ratchet mechanism comprises:

the ratchet wheel is hinged to a first position which is static relative to the load-carrying trolley and is used for winding the traction rope;

a first pawl in contact with the ratchet and configured to urge the ratchet to rotate forwardly about the first position to tension the pull-cord upon actuation of the movable striker.

Preferably, the ratchet mechanism further comprises:

a tensioning link hinged in a second position stationary relative to the load trolley to be rotatable about the second position;

one end of the first pawl is connected with the tensioning connecting rod, and the other end of the first pawl is in contact with the ratchet wheel and is used for pushing the ratchet wheel to rotate around the first position in the forward direction when the tensioning connecting rod rotates in the forward direction, so that the traction rope is tensioned;

the tensioning connecting rod is configured to be capable of contacting the movable collision block so as to rotate in the positive direction under the driving of the movable collision block or drive the movable collision block to rotate.

Preferably, the ratchet mechanism is configured such that the tension link can be automatically maintained in an initial state without the tension link contacting the movable striker.

Preferably, the ratchet mechanism comprises:

the fixed limiting structure is static relative to the load trolley;

a reset structure configured to reset the tension link to the initial state without the tension link contacting the movable bump;

and in an initial state, the fixed limiting structure resists against the tensioning connecting rod to prevent the tensioning connecting rod from reversely rotating around the second position under the action of the resetting structure.

Preferably, the resetting structure is a first balancing weight connected with one longitudinal side of the tensioning connecting rod; the fixed limiting structure is positioned on the other longitudinal side of the tensioning connecting rod.

Preferably, the bottom end of the tensioning connecting rod is connected with a second balancing weight, and the top end of the tensioning connecting rod is connected with the first pawl; the middle between the top end and the bottom end of the tensioning connecting rod is hinged to a second position which is stationary relative to the load-carrying trolley.

Preferably, the tensioning link and the ratchet wheel are hinged at different locations on the same pin that is stationary relative to the load carrying trolley.

Preferably, the tension link comprises a first link and a second link hinged on the pin and parallel and spaced apart from each other; the ratchet is located between and spaced apart from the first and second links.

Preferably, the tensioning connecting rod further comprises a connecting shaft, the first connecting rod and the second connecting rod are fixedly connected through the connecting shaft, one end of the first pawl is hinged to the connecting shaft, and the other end of the first pawl is in contact with the ratchet wheel.

Preferably, the tensioning connecting rod further comprises a fixed collision block for contacting the movable collision block so that the movable collision block drives the tensioning connecting rod to rotate in the forward direction or drives the movable collision block to rotate in the reverse direction, and the fixed collision block is mounted on the connecting shaft.

Preferably, a fixed lug plate is installed on the load-carrying trolley, and the pin shaft is positioned on the fixed lug plate;

the pin shaft is further provided with a limiting part for preventing the tensioning connecting rod and the ratchet wheel from axially translating along the pin shaft.

Preferably, the ratchet mechanism further comprises:

a second pawl hinged in a third position stationary relative to the load carrying trolley and in contact with the ratchet wheel for preventing reverse rotation of the ratchet wheel.

Preferably, a limiting block and a mounting lug plate are fixed on an arm support of the tower crane, the movable collision block is hinged on the mounting lug plate and is configured to be automatically kept in an initial state under the condition that the movable collision block is not in contact with the ratchet mechanism or the load-carrying trolley moves forward along the arm support and the movable collision block is in contact with the ratchet mechanism, and the limiting block abuts against the movable collision block to prevent the movable collision block from rotating forward under the initial state;

the movable collision block is also configured to be capable of driving the movable collision block to rotate reversely by the ratchet mechanism under the condition that the load-carrying trolley moves reversely along the arm support and the ratchet mechanism is in contact with the movable collision block, so that the movable collision block is prevented from preventing the load-carrying trolley from moving reversely.

Preferably, a part of the limiting block, which is close to the movable collision block, is provided with a first edge parallel to the longitudinal direction of the arm support and a second edge perpendicular to the longitudinal direction of the arm support, and the first edge and the second edge are adjacent to each other;

in an initial state, the movable collision block abuts against the second edge of the limiting block, and a part of the movable collision block, which is close to the limiting block, extends downwards relative to a part of the movable collision block, which is far away from the limiting block, so that when the load-carrying trolley moves along the forward direction of the arm support and the ratchet mechanism is in contact with the movable collision block, the movable collision block can be kept in the initial state and drive the ratchet mechanism to tension the traction rope;

in an initial state, the movable collision block abuts against the second edge of the limiting block, and the top of the movable collision block, which is close to the limiting block, is formed into a rounded angle, so that when the load-carrying trolley moves reversely along the arm support and the ratchet mechanism is in contact with the movable collision block, the ratchet mechanism can drive the movable collision block to rotate reversely, and the movable collision block is prevented from preventing the load-carrying trolley from moving reversely.

Based on the automatic traction rope tensioning device for the tower crane load-carrying trolley provided by the first aspect of the invention, the second aspect of the invention provides a tower crane, and the tower crane comprises the automatic traction rope tensioning device for the tower crane load-carrying trolley provided by the first aspect of the invention.

The technical scheme provided by the invention has the following beneficial effects:

according to the embodiment of the invention, the movable collision block is hinged on the arm support, and the movable collision block and the ratchet mechanism are configured to be in a way that when the load-carrying trolley moves forwards along the arm support, if the load-carrying trolley moves to the position of the movable collision block, the movable collision block can be in contact with the ratchet mechanism on the load-carrying trolley, and along with the movement of the load-carrying trolley on the arm support, the movable collision block can drive the ratchet mechanism to tension the traction rope; when the load-carrying trolley moves reversely along the arm support, and when the load-carrying trolley moves to the ratchet mechanism on the load-carrying trolley and is contacted with the movable collision block, the movable collision block is driven to rotate by the ratchet mechanism along with the continuous movement of the load-carrying trolley, so that the movable collision block is prevented from preventing the load-carrying trolley from passing through, and the normal passing of the load-carrying trolley on the arm support is ensured. Therefore, the technical scheme provided by the embodiment of the invention can realize the tensioning effect on the traction rope only by pulling the load-carrying trolley to move on the arm support of the tower crane. And the movement of the load-carrying trolley on the arm support can be completed in a cab of the tower crane, so that an operator does not need to hold a tool by hand to crawl on the tower crane, and the operation safety and the convenience of the tensioning operation of the traction rope are improved.

Drawings

FIG. 1 is a front view of a load-carrying trolley mounted on a boom of a tower crane according to an embodiment of the present invention;

FIG. 2 is a top view of a load-carrying trolley mounted on a boom of a tower crane according to an embodiment of the present invention;

FIG. 3 is a front view of a ratchet mechanism provided by an embodiment of the present invention;

FIG. 4 is a top view of the ratchet mechanism mounted on the load carrying cart provided in accordance with an embodiment of the present invention;

FIG. 5 is a sectional view A-A of FIG. 4;

FIG. 6 is a cross-sectional view B-B of FIG. 4;

FIG. 7 is a front view of a ratchet wheel provided by an embodiment of the present invention;

FIG. 8 is a longitudinal cross-sectional view of a ratchet wheel provided in accordance with an embodiment of the present invention;

FIG. 9 is a front view of a tension link provided by an embodiment of the present invention;

FIG. 10 is a longitudinal cross-sectional view of a tension link provided by an embodiment of the present invention;

FIG. 11 is a front view of a tower crane jib provided in an embodiment of the present invention when a movable bump is not in contact with a ratchet mechanism;

fig. 12 is a front view of a tower crane jib provided by an embodiment of the invention when a movable bump contacts and drives a ratchet mechanism to tension a traction rope.

Description of the reference numerals

1-a ratchet mechanism; 2-a traction rope; 3-fixing the ear plate; 4-limiting baffle plates; 5-arm support; 6-load trolley; 1-1-rope outlet; 1-2-a first locating bushing; 1-3-pin shaft; 1-4-a tension link; 1-41-a first link; 1-42-a second weight; 1-411-a first weight; 1-5-wedge; 1-6-locating pins; 1-7-a connecting shaft; 1-8-a second locating bushing; 1-9-fixing the collision block; 1-10-a first pawl; 1-11-a first ratchet plate; 1-12-reel; 1-13-wedge sleeve; 4-1-second pawl; 4-2-fixing a limit structure; 4-3-an auxiliary ear plate; 4-4-locating pins; 4-5-a third positioning sleeve; 4-6-articulated shaft; 5-1-installing an ear plate; 5-2-movable collision block; 5-3-articulated shaft; 5-4-a limiting block.

Detailed Description

In the present invention, the use of directional terms such as "upper, lower, left, right" generally means upper, lower, left, right with reference to the accompanying drawings, unless otherwise specified. "inner and outer" refer to the inner and outer contours of the component itself.

Referring to fig. 1-12, in a first aspect, the embodiment of the present invention provides an automatic tensioning device for a hauling rope 2 of a load-carrying trolley 6 of a tower crane, where the automatic tensioning device includes: the ratchet mechanism 1 is arranged on the load-carrying trolley 6 and used for winding the traction rope 2; the movable collision block 5-2, the movable collision block 5-2 is hinged on the arm support 5 of the tower crane; the movable collision block 5-2 and the ratchet mechanism 1 are configured such that when the load-carrying trolley 6 moves along the arm support 5 in the forward direction and the ratchet mechanism 1 is in contact with the movable collision block 5-2, the movable collision block 5-2 can drive the ratchet mechanism 1 to tension the traction rope 2; when the load-carrying trolley 6 moves reversely along the arm support 5 and the ratchet mechanism 1 is in contact with the movable collision block 5-2, the ratchet mechanism 1 can drive the movable collision block 5-2 to rotate so as to prevent the movable collision block 5-2 from preventing the load-carrying trolley 6 from moving reversely.

The ratchet mechanism 1 is a unidirectional clearance movement mechanism mainly composed of a ratchet wheel and a pawl, wherein the ratchet wheel can only rotate in a unidirectional mode.

The forward movement and the reverse movement mean that the two movement directions are opposite. For example, if it is defined that the load trolley 6 moves along the boom 5 of the tower crane towards the cab of the tower crane as a forward movement, the load trolley 6 moves along the boom 5 of the tower crane away from the cab of the tower crane as a reverse movement. On the contrary, if it is defined that the load-carrying trolley 6 moves towards the cab of the tower crane along the boom 5 of the tower crane as a reverse movement, the load-carrying trolley 6 moves away from the cab of the tower crane along the boom 5 of the tower crane as a forward movement.

As shown in fig. 12, the ratchet mechanism 1 can only rotate in one direction, and in the embodiment of the invention, the ratchet mechanism 1 and the movable collision block 5-2 are configured such that when the load-carrying trolley 6 moves in the forward direction, the movable collision block 5-2 contacts the ratchet mechanism 1, at this time, the movable collision block 5-2 remains stationary and can drive the ratchet wheel in the ratchet mechanism 1 to rotate in the forward direction, so as to tension the traction rope 2, and as the ratchet mechanism 1 is driven to rotate by the movable collision block 5-2, the position of the ratchet mechanism 1 is staggered with the position of the movable collision block 5-2, so that the movable collision block 5-2 is prevented from preventing the load-carrying trolley 6 from moving forward, and the load-carrying trolley 6 can normally pass through when moving in the forward direction; when the load-carrying trolley 6 moves reversely, the movable collision block 5-2 contacts the ratchet mechanism 1, at the moment, the ratchet mechanism 1 cannot rotate reversely, so that the ratchet mechanism 1 can drive the movable collision block 5-2 to rotate, and when the movable collision block 5-2 rotates to a certain degree, the movable collision block 5-2 cannot prevent the load-carrying trolley 6 from moving forwards, so that the load-carrying trolley 6 can normally pass when moving reversely on the arm support 5 of the tower crane.

In the ratchet mechanism 1 provided by the embodiment of the present invention, the ratchet wheel can only rotate clockwise, but cannot rotate counterclockwise, and the clockwise rotation direction is defined as forward rotation, and the counterclockwise rotation direction is defined as reverse rotation. Of course, in some other embodiments, the ratchet mechanism 1 may be configured such that the ratchet wheel can only rotate counterclockwise, but not clockwise.

In the embodiment of the invention, the movable collision block 5-2 is hinged on the arm support 5, and the movable collision block 5-2 and the ratchet mechanism 1 are configured in such a way that when the load-carrying trolley 6 moves along the forward direction of the arm support 5, if the load-carrying trolley 6 moves to the position of the movable collision block 5-2, the movable collision block 5-2 can be in contact with the ratchet mechanism 1 on the load-carrying trolley 6, and along with the movement of the load-carrying trolley 6 on the arm support 5, the movable collision block 5-2 can drive the ratchet mechanism 1 to tension the traction rope 2; when the load-carrying trolley 6 moves reversely along the arm support 5, and when the ratchet mechanism 1 on which the load-carrying trolley 6 moves contacts with the movable collision block 5-2, the movable collision block 5-2 is driven to rotate by the ratchet mechanism 1 along with the continuous movement of the load-carrying trolley 6, so that the movable collision block 5-2 is prevented from preventing the load-carrying trolley 6 from passing through, and the normal passing of the load-carrying trolley 6 on the arm support 5 is ensured. Therefore, the technical scheme provided by the embodiment of the invention can realize the tensioning effect on the traction rope 2 only by pulling the load-carrying trolley 6 to move on the arm support 5 of the tower crane. The movement of the load-carrying trolley 6 on the arm support 5 can be completed in a cab of the tower crane, an operator does not need to hold a tool by hand to crawl on the tower crane, and the operation safety and the convenience of the tensioning operation of the traction rope 2 are improved.

In the above embodiments, the ratchet mechanism 1 has various structural forms. In a preferred embodiment of the present invention, the ratchet mechanism 1 includes: the ratchet wheel is hinged on a first position which is static relative to the load-carrying trolley 6 and is used for winding the traction rope 2; a first pawl 1-10, the first pawl 1-10 being in contact with the ratchet wheel and configured to urge the ratchet wheel to rotate forward about the first position under the drive of the movable striker 5-2, thereby tensioning the traction rope 2. In this embodiment, the first pawl 1-10 may be directly hinged in a second position stationary relative to the load carrying trolley 6, and when the load carrying trolley 6 moves forward along the arm 5, the movable striker 5-2 may drive the first pawl 1-10 to rotate around the second position, thereby driving the ratchet to rotate forward and tensioning the traction rope 2.

In some other embodiments, said first pawl 1-10 may also be associated with a tensioning link 1-4, the tensioning link 1-4 being hinged in a second position stationary with respect to said load-carrying trolley 6 so as to be able to rotate about said second position; one end of the first pawl 1-10 is connected with the tensioning connecting rod 1-4, and the other end of the first pawl is in contact with the ratchet wheel, so that when the tensioning connecting rod 1-4 rotates in the forward direction, the ratchet wheel is pushed to rotate around the first position in the forward direction, and the traction rope 2 is tensioned; the tensioning connecting rod 1-4 is configured to contact the movable collision block 5-2 so as to rotate forward under the driving of the movable collision block 5-2 or drive the movable collision block 5-2 to rotate.

Specifically, when the load-carrying trolley 6 moves reversely along the arm support 5, the tensioning connecting rod 1-4 is in contact with the movable collision block 5-2, and at the moment, under the stopping action of the first pawl 1-10, the tensioning connecting rod 1-4 is kept still and can drive the movable collision block 5-2 to rotate, so that the movable collision block 5-2 is prevented from preventing the load-carrying trolley 6 from moving forwards.

When the load-carrying trolley 6 moves forwards along the arm support 5, the movable collision block 5-2 can drive the tensioning connecting rod 1-4 to rotate forwards around the second position, and when the tensioning connecting rod 1-4 rotates forwards, the first pawl 1-10 is driven to move, so that the ratchet wheel is driven to rotate forwards, and the traction rope 2 is tensioned. It should be noted here that the first pawl 1-10 may be fixedly connected to the tension link 1-4, i.e. the first pawl 1-10 and the tension link 1-4 maintain a relatively stationary positional relationship, or may be hingedly connected to the tension link 1-4.

With the rotation of the tensioning connecting rod 1-4 driven by the movable collision block 5-2, when the tensioning connecting rod 1-4 rotates to a position where the tensioning connecting rod is not in contact with the movable state, the load-carrying trolley 6 staggers the movable collision block 5-2 and continues to move forwards. At this point, the position of the tension link 1-4 has changed relative to before it does not contact the movable bump 5-2.

In a preferred embodiment of the present invention, the ratchet mechanism 1 is configured such that the tension link 1-4 can be automatically maintained in an initial state without the tension link 1-4 contacting the movable striker 5-2. Namely, after the load-carrying trolley 6 staggers the movable collision block 5-2, the tensioning connecting rod 1-4 can be automatically reset to an initial state, thereby ensuring that the tensioning connecting rod 1-4 always swings in a small amplitude range.

In order to achieve the above purpose, the configuration of the ratchet mechanism 1 may be various, for example, the ratchet mechanism 1 includes: the fixed limiting structure 4-2 is fixed on the load trolley 6, and the fixed limiting structure 4-2 is static relative to the load trolley 6; a reset structure configured with the fixed limit structure 4-2 to reset the tension link 1-4 to the initial state without the tension link 1-4 contacting the movable bump 5-2; in an initial state, the fixed limiting structure 4-2 resists against the tensioning connecting rod 1-4, so that the tensioning connecting rod 1-4 is prevented from reversely rotating around the second position under the action of the resetting structure.

Wherein, the reset mechanism can be a spring or a first balancing weight 1-411 arranged on the tension connecting rod. When the return structure is a spring, one end of the spring can be fixed in a stationary position relative to the load-carrying trolley 6, and the other end is connected with the tensioning connecting rods 1-4. When the tensioning connecting rod 1-4 is not contacted with the movable collision block 5-2 any more, the tensioning connecting rod 1-4 can be pulled by the stretched spring to rotate around the second position, when the tensioning connecting rod 1-4 rotates to be contacted with and abutted against the fixed limiting structure 4-2, the tensioning connecting rod 1-4 does not rotate continuously any more, the static initial state is kept, and the reset is realized through the elastic force after the spring is stretched.

If the first balancing weight 1-411 is adopted to realize the reset of the tensioning connecting rod 1-4, the reset is realized by the self gravity of the tensioning connecting rod 1-4. Specifically, a first balancing weight 1-411 is connected to one longitudinal side of the tension link 1-4, and the fixed limiting structure 4-2 is located on the other longitudinal side of the tension link 1-4. Namely, the first balancing weight 1-411 and the fixed limiting structure 4-2 are respectively positioned at the longitudinal two sides of the tensioning connecting rod 1-4. The difference is that the fixed limit structure 4-2 is fixed on the load-carrying trolley 6 and is separated from the tensioning connecting rod 1-4; the first balancing weight 1-411 is fixed on the tensioning connecting rod 1-4 and is connected with the tensioning connecting rod 1-4. In specific implementation, the first balancing weight 1 to 411 may be a part of the tensioning link 1 to 4, that is, the first balancing weight 1 to 411 and the tensioning link 1 to 4 are integrally formed, or may be a component manufactured separately from the tensioning link 1 to 4, and may be welded to one longitudinal side of the tensioning link 1 to 4 by welding, or may be fixed to one longitudinal side of the tensioning link 1 to 4 by plugging or connecting by a connector.

Referring to fig. 9-10, in a preferred embodiment of the present invention, the first weight member 1-411 is integrally formed with the tension link 1-4 as part of the tension link 1-4. The middle part of the tensioning connecting rod 1-4 is provided with a through hole which is hinged on a second position which is static relative to the load-carrying trolley 6 and can rotate around the second position. As the first balancing weight 1-411 is arranged on the left side of the tensioning connecting rod 1-4, under the condition that the tensioning connecting rod 1-4 is not contacted with the movable collision block 5-2, the tensioning connecting rod 1-4 has the property of rotating anticlockwise around the second position, and when the tensioning connecting rod 1-4 rotates to be contacted with the fixed limiting structure 4-2, the tensioning connecting rod is blocked by the fixed limiting structure 4-2 and keeps at the position contacted with the fixed limiting structure 4-2.

It will be appreciated that the arrangement of the fixed limit formation 4-2 and the tension link 1-4 may be varied. For example, the fixed limit structure 4-2 may be arranged at the left side of the hinge portion of the tension link 1-4, and at this time, the tension link 1-4 will form a certain inclined angle with the vertical direction perpendicular to the ground when in the initial state.

In the preferred embodiment of the present invention, the fixing stopper 4-2 is provided at the right side of the hinge portion of the tension link 1-4 and enables the tension link 1-4 to be maintained in the vertical direction when it is at the initial position.

Through the mutual matching of the fixed limiting structure 4-2 and the first balancing weight 1-411, on one hand, the reset action of the tensioning connecting rod 1-4 can be realized, and on the other hand, the ratchet wheel can be prevented from reversely rotating, so that the working reliability of the ratchet wheel is ensured.

In a further preferred embodiment of the present invention, in order to ensure better return of the tensioning connecting rods 1-4 to the vertical initial state, referring to fig. 10, the bottom ends of the tensioning connecting rods 1-4 are provided with second balancing weights 1-42, and the top ends of the tensioning connecting rods 1-4 are connected with the first pawls 1-10; the intermediate section between the top and bottom ends of the tensioning links 1-4 is articulated in a second position which is stationary relative to the load-carrying trolley 6. By arranging the second balancing weight 1-42 at the lower end of the tensioning connecting rod 1-4, the tensioning connecting rod 1-4 can be more stably kept in the vertical initial state when not contacting the movable collision block 5-2.

The second balancing weight 1-42 may be a separate component from the tensioning link 1-4, or may be integrally formed with the tensioning link 1-4.

As mentioned before, the ratchet wheel is articulated in a first position stationary relative to the load carrier 6 and the tensioning links 1-4 are articulated in a second position relative to the load carrier 6. Wherein the first position may be a position fixed to a first part on the load trolley 6 and the second position may be a position fixed to a second part on the load trolley 6. The first part and the second part may be two different parts.

In order to simplify the structure of the automatic tensioning device, in a preferred embodiment of the invention, the tensioning links 1-4 and the ratchet wheel are articulated in different positions on the same part that is stationary with respect to the trolley. For example, the tensioning links 1-4 and the ratchet wheel are hinged at different locations on the same pin 1-3 that is stationary relative to the load carrying trolley 6.

The pin shafts 1-3 can be fixed on the load-carrying trolley 6 in various ways, and the structural strength and the stability of the automatic tensioning device are improved. The pin shafts 1-3 are fixed on a load-carrying trolley 6 through fixed lug plates 3. Specifically, the fixed ear plate 3 may be welded to the load-carrying trolley 6, for example, and the fixed ear plate 3 is provided with a hinge hole, in which the pin 1-3 is inserted and fixed on the fixed ear plate 3 to keep a static state relative to the fixed ear plate 3. In a preferred embodiment, the pins 1-3 can be fixed to the fixing lugs 3, for example, by means of fixing pins 1-6.

The tensioning connecting rod 1-4 and the ratchet wheel are hinged on the pin shaft 1-3 and can rotate around the pin shaft 1-3. The hinge positions of the tension connecting rods 1-4 and the ratchet wheel on the pin shafts 1-3 can be various, for example, the tension connecting rods 1-4 and the ratchet wheel can be hinged on the left side and the right side of the pin shafts 1-3 along the axial direction of the pin shafts 1-3.

Referring to fig. 5, in order to improve the structural compactness and stability of the automatic tensioner, in a preferred embodiment of the present invention, the tension link 1-4 includes a first link 1-41 and a second link hinged to the pin 1-3 and parallel and spaced apart from each other; the ratchet is located between the first link 1-41 and the second link and spaced apart from the first link 1-41 and the second link.

The second balancing weight 1-42 is installed between the bottom ends of the first connecting rod 1-41 and the second connecting rod, and the first connecting rod 1-41, the second connecting rod and the ratchet wheel are axially limited through the limiting piece so as to avoid axial translation of the first connecting rod 1-41, the second connecting rod and the ratchet wheel along the pin shaft 1-3. I.e. the first links 1-41, the second links and the ratchet are restricted to rotation only along the articulation region.

Referring to fig. 5, the limiting member may be a positioning sleeve in a preferred embodiment of the present invention. The positioning shaft sleeve can comprise a first positioning shaft sleeve 1-2 arranged at the outer side of the first connecting rod 1-41 and the second connecting rod, and a second positioning shaft sleeve 1-8 arranged at the two ends of the ratchet wheel; the positioning shaft sleeve is coaxially sleeved outside the pin shaft 1-3. The first connecting rod 1-41, the second connecting rod and the ratchet wheel can be limited at a specific axial position of the pin shaft 1-3 through the limiting action of the first positioning shaft sleeve 1-2 and the second positioning shaft sleeve 1-8.

As described above, the tension link 1-4 is connected to the first pawl 1-10, and in order to facilitate connection of the first pawl 1-10, the tension link 1-4 further includes a connecting shaft 1-7, the first link 1-41 and the second link are fixedly connected by the connecting shaft 1-7, one end of the first pawl 1-10 is hinged to the connecting shaft 1-7, and the other end thereof is in contact with the ratchet.

Continuing to refer to fig. 5, the upper end portions of the first connecting rod 1-41 and the second connecting rod, which are opposite to each other, are provided with through holes, and the connecting shaft 1-7 penetrates through the through holes and is fixedly connected with the first connecting rod 1-41 and the second connecting rod through a positioning pin 4-4. That is, the connecting shaft 1-7 is maintained in a stationary state with respect to the first link 1-41 and the second link. One end of the first pawl 1-10 can be fixed on the connecting shaft 1-7 or hinged on the connecting shaft 1-7, and the other end is contacted with the ratchet wheel. When the first connecting rod 1-41 and the second connecting rod rotate around the pin shaft 1-3 in the positive direction, the first pawl 1-10 can be driven to push the ratchet wheel to rotate in the positive direction, and therefore the traction rope 2 is tensioned.

When the load-carrying trolley 6 moves along the arm support 5, the tension connecting rod 1-4 on the load-carrying trolley can be contacted with the movable collision block 5-2, so that the movable collision block 5-2 is driven to rotate, or the movable collision block 5-2 is driven to rotate. To achieve the object, the tension link 1-4 further includes a fixed bump 1-9 for contacting the movable bump 5-2 such that the movable bump 5-2 drives the tension link 1-4 to rotate in a forward direction or the tension link 1-4 drives the movable bump 5-2 to rotate in a reverse direction, the fixed bump 1-9 being mounted on the connecting shaft 1-7. As shown in fig. 5, the fixed striker 1-9 is fixed to the connecting shaft 1-7 at a position close to the first pawl 1-10.

When the load-carrying trolley 6 moves along the arm support 5, only the fixed collision blocks 1-9 on the tensioning connecting rods 1-4 are contacted with the movable collision blocks 5-2, and other parts are not contacted with the movable collision blocks 5-2. When the load-carrying trolley 6 moves forward, the movable collision block 5-2 can collide the fixed collision block 1-9, so that the fixed collision block 1-9 drives the first connecting rod 1-41 and the second connecting rod on the connecting shaft 1-7 to rotate forward around the pin shaft 1-3, and the traction rope 2 is tensioned. When the load-carrying trolley 6 moves reversely, the fixed collision block 1-9 can collide with the movable collision block 5-2, and the first connecting rod 1-41 and the second connecting rod cannot rotate reversely under the limiting action of the first pawl 1-10 and the fixed limiting structure 4-2, so that the fixed collision block 1-9 can drive the movable collision block 5-2 to rotate reversely, and the movable collision block 5-2 is prevented from preventing the load-carrying trolley 6 from moving forwards.

The ratchet wheel is used for winding the traction rope 2, and the structure form of the ratchet wheel is various. Referring to fig. 7-8, in the preferred embodiment of the present invention, the ratchet comprises a spool 1-12 and first and second ratchet plates 1-11 coaxially fixed at both ends of the spool 1-12; the winding drum 1-12 is used for winding the traction rope 2, the first ratchet wheel disc 1-11 or the second ratchet wheel disc is provided with a rope outlet hole 1-1 for leading out the traction rope 2, and the back of the first ratchet wheel disc 1-11 or the second ratchet wheel disc is also provided with a wedge piece for limiting the traction rope 2 on the ratchet wheel. The wedge members may be, for example, wedge sleeves 1-13 welded to the back of the first ratchet plate 1-11 or the second ratchet plate, and wedges 1-5 installed in the wedge sleeves 1-13. Wherein the back of the first ratchet disk 1-11 or the second ratchet disk is referred to as the side of the first ratchet disk 1-11 and the second ratchet disk facing away from each other.

The traction rope 2 is led into the ratchet wheel, is wound on the winding drum 1-12, is led out through the rope outlet hole 1-1 and is fixed on the ratchet wheel through the wedge, and when the ratchet wheel rotates in the forward direction, the traction rope 2 on the winding drum 1-12 is tensioned.

The ratchet wheel has the characteristic of unidirectional rotation, in the technical scheme provided by the embodiment of the invention, the ratchet wheel can only rotate clockwise (can also be regarded as forward rotation) but cannot rotate anticlockwise (can also be regarded as reverse rotation), and the characteristic of the ratchet wheel can be realized through the first pawls 1-10.

In the preferred embodiment of the present invention, the unidirectional rotation performance of the ratchet is ensured more reliably. The ratchet mechanism 1 further comprises a second pawl 4-1, said second pawl 4-1 being hinged in a third position stationary relative to the load carrying trolley 6 and being in contact with the ratchet for preventing reverse rotation of the ratchet.

In a preferred embodiment of the present invention, the third position is a position on the fixed tab. Namely, the hinge pin shaft 1-3 of the ratchet wheel and the tension connecting rod 1-4 and the hinge shaft 4-6 of the second pawl 4-1 are fixed on the fixed pole ear. This improves the compactness of the automatic tensioner.

In order to hinge the second pawl 4-1 to the fixed tab, referring to fig. 6, the ratchet mechanism 1 further includes an auxiliary tab, the auxiliary tab is located between two fixed tabs and is paired with one of the fixed tabs for fixing the hinge shaft 4-6, and the hinge shaft 4-6 is fixed between the auxiliary tab and the fixed tab by the positioning pin 4-4. The second pawl 4-1 is hinged on the hinge shaft 4-6, and the two sides of the hinged part are limited by a third positioning sleeve 4-5 to avoid the axial translation of the second pawl 4-1 along the hinge shaft 4-6.

Referring to fig. 3, when the movable collision block 5-2 drives the tension link rod 1-4 to rotate, the first pawl 1-10 drives the ratchet wheel to rotate clockwise, and the traction rope 2 on the ratchet wheel is tensioned. After rotating a certain angle, the second pawl 4-1 is clamped in the ratchet groove due to the action of self gravity, so that the ratchet is prevented from rotating reversely, and the limiting effect on the ratchet is achieved.

In addition, in order to limit the position of the second pawl 4-1, in a preferred embodiment of the present invention, a limit baffle 4 is further welded on the fixed ear plate 3, and the limit baffle 4 ensures that the second pawl 4-1 always swings in a small amplitude at the side of the ratchet wheel, so as to better ensure the unidirectional rotation of the ratchet wheel. In some other embodiments, the limit baffle 4 can be replaced by a spring, for example, a limit spring is arranged at the root of the second pawl 4-1 to limit the second pawl 4-1 to swing within a small amplitude range.

Through the arrangement of the second pawl 4-1, the second pawl 4-1 and the first pawl 1-10 act together to ensure that the ratchet wheel rotates in one direction for double limiting, and the working reliability of the ratchet mechanism 1 is improved. For example, when the second pawl 4-1 fails due to rusting and the like, and the second pawl 4-1 does not limit the rotation of the ratchet wheel, the fixed limit structure 4-2 limits the rotation of the tension connecting rod 1-4, the tension connecting rod 1-4 is provided with the first pawl 1-10, and the first pawl 1-10 plays a role in limiting the ratchet wheel. Therefore, the ratchet wheel can be ensured not to rotate anticlockwise, and the safety and the reliability of tensioning are improved.

As described above, the movable collision block 5-2 is configured such that when the load trolley 6 moves forward along the arm support 5 and the tension link 1-4 contacts the movable collision block 5-2, the movable collision block 5-2 can remain at the initial position and can drive the tension link 1-4 to rotate forward; when the load-carrying trolley 6 moves reversely along the arm support 5 and the tensioning connecting rod 1-4 is in contact with the movable collision block 5-2, the tensioning connecting rod 1-4 is kept at the initial position and can drive the movable collision block 5-2 to rotate reversely (for example, rotate anticlockwise), so that the movable collision block 5-2 is prevented from preventing the load-carrying trolley 6 from moving forwards.

To achieve this, the movable ram 5-2 is configured in a variety of ways, see figures 11-12, in the preferred embodiment of the invention, a limiting block 5-4 and a mounting lug plate 5-1 are fixed on an arm support 5 of the tower crane, the movable collision block 5-2 is hinged on the mounting ear plate 5-1 through a hinge shaft 5-3 and is configured to, under the condition that the movable collision block 5-2 is not contacted with the ratchet mechanism 1, or the load trolley 6 positively moves along the arm support 5, and the movable striking block 5-2 can be automatically kept in an initial state under the state that the movable striking block 5-2 contacts the ratchet mechanism 1, in an initial state, the limiting block 5-4 resists against the movable collision block 5-2 to prevent the movable collision block 5-2 from rotating in the forward direction;

the movable collision block 5-2 is further configured such that, in a state where the load-carrying trolley 6 moves in the reverse direction along the arm support 5 and the ratchet mechanism 1 is in contact with the movable collision block 5-2, the ratchet mechanism 1 can drive the movable collision block 5-2 to rotate in the reverse direction, so as to prevent the movable collision block 5-2 from preventing the load-carrying trolley 6 from moving in the reverse direction.

In specific implementation, the fixed collision blocks 1-9 on the tensioning connecting rods 1-4 of the ratchet mechanism 1 are in collision fit with the movable collision blocks 5-2 to realize the tensioning effect of the traction rope 2.

In order to achieve the above object of the movable striking block 5-2, in a preferred embodiment of the present invention, a portion of the stopper 5-4, which is close to the movable striking block 5-2, has a first edge parallel to the longitudinal direction of the arm support 5 and a second edge perpendicular to the longitudinal direction of the arm support 5, and the first edge and the second edge are adjacent to each other;

in an initial state, the movable striking block 5-2 abuts against a second edge of the limiting block 5-4, and a portion of the movable striking block 5-2 close to the limiting block 5-4 extends downward relative to a portion of the movable striking block 5-2 far from the limiting block 5-4, so that when the load-carrying trolley 6 moves along the forward direction of the arm support 5 and the ratchet mechanism 1 contacts with the movable striking block 5-2, the movable striking block 5-2 can be kept in the initial state and drive the ratchet mechanism 1 to tension the traction rope 2;

in an initial state, the movable collision block 5-2 abuts against the second edge of the limiting block 5-4, and the top of the movable collision block 5-2 close to the limiting block 5-4 is formed into a rounded corner, so that when the load-carrying trolley 6 moves reversely along the arm support 5 and the ratchet mechanism 1 contacts with the movable collision block 5-2, the ratchet mechanism 1 can drive the movable collision block 5-2 to rotate reversely, so as to prevent the movable collision block 5-2 from preventing the load-carrying trolley 6 from moving reversely.

Since the part of the movable collision block 5-2 close to the limit block 5-4 extends downwards relative to the part of the movable collision block 5-2 far from the limit block 5-4, the downwards extending part can be blocked by the limit block 5-4, so that when the load-carrying trolley 6 moves forwards and the fixed collision block 1-9 on the tensioning connecting rod 1-4 is contacted with the movable collision block 5-2, the movable collision block 5-2 is kept in a static state, and the tensioning connecting rod 1-4 is driven to rotate.

Moreover, because the top of the movable collision block 5-2 close to the limit block 5-4 is formed into a rounded corner, when the load-carrying trolley 6 moves reversely and the fixed collision block 1-9 on the tensioning connecting rod 1-4 contacts with the movable collision block 5-2, the tensioning connecting rod 1-4 is limited by the fixed limit structure 4-2 and the first pawl 1-10 and the second pawl 4-1 and is kept at the initial position, and the movable collision block 5-2 is not blocked by the limit block 5-4, so that the counterclockwise rotation is realized, and the situation that the downward extending part blocks the load-carrying trolley 6 to move forwards is avoided.

Taking fig. 11 as an example, the limiting block 5-4 is located at the left side of the movable collision block 5-2, it can be understood that, in order to make the movable collision block 5-2 rotate counterclockwise to a certain extent, and the movable collision block 5-2 can return to the initial state after the tension link rod 1-4 is not in contact with the movable collision block 5-2, the center of gravity of the movable collision block 5-2 is located at the right side of the hinge shaft 4-6 of the movable collision block 5-2.

Based on the automatic tensioning device for the traction rope 2 of the load-carrying trolley 6 of the tower crane provided by the first aspect of the embodiment of the invention, the second aspect of the embodiment of the invention provides the tower crane which comprises an arm support 5, the load-carrying trolley 6 arranged on the arm support 5 and the automatic tensioning device for the traction rope 2 of the load-carrying trolley 6. The automatic tensioning device is an automatic tensioning device for the traction rope 2 of the tower crane load-carrying trolley 6 according to the first aspect of the embodiment of the invention.

The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings, but the present invention is not limited thereto. Within the scope of the technical idea of the invention, many simple modifications can be made to the technical solution of the invention. Including each of the specific features, are combined in any suitable manner. The invention is not described in detail in order to avoid unnecessary repetition. Such simple modifications and combinations should be considered within the scope of the present disclosure as well.

Claims

1. The utility model provides a haulage rope automatic take-up device of tower machine load dolly which characterized in that, automatic take-up device includes:

the movable collision block is hinged on an arm support of the tower crane;

2. The automatic towline tensioning device of a tower crane load trolley according to claim 1, characterized in that the ratchet mechanism comprises:

3. The automatic towline tensioning device of a tower crane load-carrying trolley as claimed in claim 2, wherein the ratchet mechanism further comprises:

4. The automatic towline tensioning device for tower crane load-carrying trolleys according to claim 3, wherein the ratchet mechanism is configured such that the tension link can be automatically maintained in an initial state without the tension link contacting the movable bump.

5. The automatic towline tensioning device of a tower crane load trolley according to claim 4, wherein the ratchet mechanism comprises:

the fixed limiting structure is static relative to the load trolley;

6. The automatic traction rope tensioning device for the tower crane load-carrying trolley as claimed in claim 5, wherein the resetting structure is a first balancing weight connected to one longitudinal side of the tensioning connecting rod; the fixed limiting structure is positioned on the other longitudinal side of the tensioning connecting rod.

7. The automatic traction rope tensioning device for the tower crane load-carrying trolley as claimed in claim 6, wherein a second counterweight is connected to the bottom end of the tensioning connecting rod, and the top end of the tensioning connecting rod is connected to the first pawl; the middle between the top end and the bottom end of the tensioning connecting rod is hinged to a second position which is stationary relative to the load-carrying trolley.

8. The automatic towline tensioning device for tower crane load-carrying trolleys according to claim 3, wherein the tensioning connecting rod and the ratchet wheel are hinged at different positions of the same pin shaft which is stationary relative to the load-carrying trolleys.

9. The automatic towline tensioning device of a tower crane load-carrying trolley as claimed in claim 8, wherein the tensioning link comprises a first link and a second link hinged on the pin and parallel to and spaced apart from each other; the ratchet is located between and spaced apart from the first and second links.

10. The automatic towline tensioning device of the tower crane load-carrying trolley as claimed in claim 9, wherein the tensioning connecting rod further comprises a connecting shaft, the first connecting rod and the second connecting rod are fixedly connected through the connecting shaft, one end of the first pawl is hinged to the connecting shaft, and the other end of the first pawl is in contact with the ratchet wheel.

11. The automatic towline tensioning device of a tower crane load-carrying trolley according to claim 10, wherein the tensioning connecting rod further comprises a fixed collision block for contacting the movable collision block so that the movable collision block drives the tensioning connecting rod to rotate forward or the tensioning connecting rod drives the movable collision block to rotate reversely, and the fixed collision block is mounted on the connecting shaft.

12. The automatic traction rope tensioning device for the tower crane load-carrying trolley as claimed in claim 8, wherein the load-carrying trolley is provided with a fixed lug plate, and the pin shaft is positioned on the fixed lug plate;

13. The automatic towline tensioning device of a tower crane load-carrying trolley as claimed in claim 2, wherein the ratchet mechanism further comprises:

14. The automatic traction rope tensioning device for the tower crane load-carrying trolley as claimed in claim 1, wherein a limiting block and a mounting lug plate are fixed on the arm support of the tower crane, the movable collision block is hinged on the mounting lug plate and configured to be automatically kept in an initial state under the condition that the movable collision block is not in contact with the ratchet mechanism or the load-carrying trolley moves forward along the arm support and is in contact with the ratchet mechanism, and the limiting block abuts against the movable collision block to prevent the movable collision block from rotating forward under the initial state;

15. The automatic tow rope tensioning device for a tower crane load-carrying trolley according to claim 14, wherein the part of the limit block near the movable bump has a first edge parallel to the longitudinal direction of the arm support and a second edge perpendicular to the longitudinal direction of the arm support, the first edge and the second edge abutting each other;

16. A tower crane, characterized in that the tower crane comprises an automatic traction rope tensioning device of a load-carrying trolley of the tower crane according to any one of claims 1-15.