CN115215236A

CN115215236A - Luffing rope tensioning system of tower crane and tower crane

Info

Publication number: CN115215236A
Application number: CN202210701667.9A
Authority: CN
Inventors: 宾英
Original assignee: Zoomlion Construction Crane Co Ltd
Current assignee: Zoomlion Construction Crane Co Ltd
Priority date: 2022-06-20
Filing date: 2022-06-20
Publication date: 2022-10-21

Abstract

The invention provides a luffing rope tensioning system of a tower crane and the tower crane, wherein the luffing rope tensioning system of the tower crane comprises a luffing trolley and a luffing drum, the luffing trolley comprises a frame which is detachably arranged at the root of a boom of the tower crane, and a tensioning device and a joint which are fixedly connected to the frame, and the tensioning device comprises a tensioning wheel; the two ends of the amplitude-variable winding drum are respectively connected with an amplitude-variable long rope and an amplitude-variable short rope, the amplitude-variable long rope penetrates through an arm tip pulley located at the arm tip of a crane arm of the tower crane to be connected with a joint, the amplitude-variable short rope penetrates through an arm root pulley located at the arm root of the crane arm to be connected with a tension pulley, and the tension pulley can rotationally tension the amplitude-variable short rope. The system uses the manually driven tensioning device to tension the luffing short rope, uses the mechanically driven luffing drum to tension the luffing long rope, effectively reduces the tensioning force required by manually tensioning the luffing short rope, and greatly reduces the labor intensity of an operator using the luffing rope tensioning system.

Description

Luffing rope tensioning system of tower crane and tower crane

Technical Field

The invention belongs to the technical field of tower cranes, and particularly relates to a luffing rope tensioning system of a tower crane and the tower crane.

Background

With the development of the construction industry, the convenience and safety of operation and control have become widely recognized and pursued in the tower crane industry. At present, a tensioning mode of a variable-amplitude long rope is generally adopted in the industry, a tensioning device of the variable-amplitude rope is an auxiliary component of a tower crane variable-amplitude trolley, and the variable-amplitude trolley and a lifting hook below the variable-amplitude trolley can move back and forth along the direction of a cargo boom by tensioning the variable-amplitude rope, so that the purpose of hoisting cargoes by a tower crane is achieved. The luffing rope is easy to elongate and droop after being stressed in use, and the luffing rope tensioning device prevents the luffing rope from loosening by tensioning the luffing rope so as to ensure that the luffing rope is always kept in a tensioning state, so that the luffing trolley of the tower crane can be normally used, but the existing tower crane luffing rope tensioning device not only needs to align and adjust the rotation angle of a tensioning wheel for many times in the rope tensioning process, consumes much time and has potential safety hazards in the process of using a crowbar; and the existing tower crane luffing rope tensioning device has high labor intensity in the rope tensioning process, is operated by single lever transmission, needs high tensioning force, is particularly labor-consuming in tensioning when the jib is long and the luffing rope is thick, and has very low humanization degree. Therefore, the existing tower crane luffing rope tensioning device cannot meet the requirements in practical use, so that an improved technology is urgently needed in the market to solve the problems.

Disclosure of Invention

The invention mainly aims to provide a luffing rope tensioning system of a tower crane and the tower crane, and aims to solve the technical problems that the tower crane luffing rope tensioning system in the prior art needs large tensioning force and has certain safety risk.

In order to achieve the above object, the present invention provides a horn tensioning system, wherein the horn tensioning system comprises:

the amplitude variation trolley comprises a frame, a tensioning device and a joint, wherein the frame is detachably arranged at the root of a cargo boom of the tower crane, and the tensioning device and the joint are fixedly connected to the frame and comprise tensioning wheels; and

the two ends of the amplitude-variable winding drum are respectively connected with an amplitude-variable long rope and an amplitude-variable short rope, the amplitude-variable long rope penetrates through an arm tip pulley located at the arm tip of a crane arm of the tower crane to be connected with a joint, the amplitude-variable short rope penetrates through an arm root pulley located at the arm root of the crane arm to be connected with a tension pulley, and the tension pulley can rotationally tension the amplitude-variable short rope.

In the embodiment of the invention, the first reel rotating direction of the amplitude-changing reel can pull the amplitude-changing trolley to move towards the arm tip pulley, and the rotation of the amplitude-changing reel along the first reel rotating direction can tension the amplitude-changing long rope.

In the embodiment of the invention, the tensioning device further comprises a rotating shaft and a U-shaped lug plate, the U-shaped lug plate comprises two side plates fixedly connected with the frame, the tensioning wheel is clamped in a U-shaped groove between the two side plates, and the rotating shaft penetrates through the tensioning wheel and the two side plates.

In the embodiment of the invention, the tensioning wheel comprises a ratchet wheel, a middle circular wheel and an outer circular wheel which are distributed along the axial direction, and the outer diameters of the ratchet wheel and the outer circular wheel are larger than that of the middle circular wheel, so that a rope winding ring groove surrounding the outer peripheral wall of the middle circular wheel is formed on the tensioning wheel.

In an embodiment of the invention, the tensioning device further comprises a ratchet stop, and the ratchet stop is matched with the ratchet to keep the short luffing rope tensioned.

In the embodiment of the invention, the tensioning device further comprises a spanner, one end of the spanner is sleeved on the rotating shaft, and the other end of the spanner extends out of a ratchet wheel push rod for pushing the gear teeth of the ratchet wheel to rotate.

In the embodiment of the invention, the outer side wall of the outer circular wheel is provided with a rope end fixing part and a rope through hole, and the end part of the variable-amplitude short rope wound in the rope winding ring groove passes through the rope through hole to be connected to the rope end fixing part.

In the embodiment of the invention, the rope end fixing part comprises a connecting block and a protective cover, the connecting block is fixedly arranged on the outer side wall of the outer circular wheel, and the protective cover covers the connecting block and is used for guiding the amplitude-variable short rope to pass through the rope through hole.

In an embodiment of the invention, the luffing rope tensioning system of the tower crane further comprises a riding wheel for preventing the luffing long rope or the luffing short rope from drooping, and the riding wheel is arranged between the luffing drum and the arm tip pulley or the arm root pulley.

In an embodiment of the present invention, a tower crane is also presented, which comprises the luffing line tensioning system of a tower crane as described above.

Through the technical scheme, the luffing rope tensioning system of the tower crane provided by the embodiment of the invention has the following beneficial effects:

before the luffing rope tensioning system of the tower crane works, a luffing short rope is required to pull a luffing trolley to reach and be fixed at the root of a crane boom of the tower crane through the rotation of a luffing drum, then a luffing long rope is tensioned through the rotation of the luffing drum, when the luffing long rope is close to a horizontal state, a luffing mechanism is stopped to complete the tensioning work of the luffing long rope, and finally a tensioning device is used to tension the luffing short rope. Because the tensioning force that becomes width of cloth rope needs is little, the tensioning force that becomes width of cloth rope needs is big to under the unable simultaneous tensioning of the winding drum that becomes width of cloth rope and the long rope that becomes width of cloth, this system will use manpower driven overspeed device tensioner to be used for tensioning becomes width of cloth rope, use mechanical drive's the winding drum that becomes width of cloth to be used for tensioning becomes width of cloth rope, the required tensioning force of the short rope that becomes width of cloth rope of manual tensioning has been reduced effectively, the intensity of labour that operating personnel used the tensioning system of the rope that becomes width of cloth rope has been reduced by a wide margin, and the simple structure that this system adopted arranges easily, and the cost is also lower.

Additional features and advantages of the invention will be set forth in the detailed description which follows.

Drawings

The accompanying drawings, which are included to provide an understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:

FIG. 1 is a schematic structural diagram of a luffing line tensioning system for a tower crane according to an embodiment of the present disclosure;

FIG. 2 is a schematic structural diagram of a luffing carriage according to an embodiment of the invention;

FIG. 3 is a schematic view of a tensioner according to an embodiment of the present invention;

FIG. 4 is a schematic illustration of the tensioner when attached to a luffing rope according to an embodiment of the invention;

FIG. 5 is a schematic view of a wrench according to an embodiment of the present invention;

fig. 6 is a schematic view of an assembly structure of the wrench according to an embodiment of the present invention.

Description of the reference numerals

Reference numerals	Name (R)	Reference numerals	Name (R)
				10	Vehicle frame	211	Ratchet wheel
31	Variable-amplitude long rope	212	Middle round wheel
				32	Amplitude variable short rope	213	External round wheel
30	Amplitude-variable winding drum	11	Spanner
				20	Tension device	24	Ratchet wheel stop block
21	Tension wheel	112	Short round steel
				22	Rotating shaft	40	Rope penetrating hole
23	Side plate	251	Connecting block
				50	Riding wheel	252	Protective cover
12	Joint	60	Arm root pulley
				70	Arm tip pulley	25	Rope end fixing part
13	Connecting plate	111	Ratchet push rod
				214	Rope winding ring groove

Detailed Description

The following detailed description of specific embodiments of the invention refers to the accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative and explanatory of the invention and are not restrictive thereof.

A luffing rope tensioning system of a tower crane according to the invention is described below with reference to the drawings.

As shown in fig. 1, in an embodiment of the present invention, a luffing rope tensioning system of a tower crane is provided, wherein the luffing rope tensioning system of the tower crane comprises a luffing trolley and a luffing drum 30, the luffing trolley comprises a frame 10 for being detachably mounted at a boom root of a boom of the tower crane, and a tensioning device 20 and a joint 12 fixedly connected to the frame 10, the tensioning device 20 comprises a tensioning wheel 21; the two ends of the amplitude-variable winding drum 30 are respectively connected with an amplitude-variable long rope 31 and an amplitude-variable short rope 32, the amplitude-variable long rope 31 passes through an arm tip pulley 70 at the arm tip of a crane arm of the tower crane to be connected with the joint 12, the amplitude-variable short rope 32 passes through an arm root pulley 60 at the arm root of the crane arm to be connected with the tension pulley 21, and the tension pulley 21 can rotationally tension the amplitude-variable short rope 32.

When the tower crane luffing mechanism works, the luffing drum 30 can lead the luffing trolley to move towards the direction close to the arm tip pulley 70 or the arm root pulley 60 by rotating and pulling the luffing long rope 31 or the luffing short rope 32. However, when the luffing rope tensioning system in the solution of the present invention tensions the short luffing rope 32 and the long luffing rope 31, the luffing trolley needs to be fixedly connected to the root of the jib through the connecting plate 13 on the frame 10, so that the luffing trolley does not move when the tension is applied to the long luffing rope 31 and the short luffing rope 32.

After the trolley is fixed, one end of the connecting arm root pulley 60 is provided with the amplitude-variable short rope 32, and the connecting arm tip pulleyOne end of 70 is a luffing rope 31, and since the luffing trolley is fixed at one end close to the arm root pulley 60, the rope length of the luffing rope 32 is shorter than that of the luffing rope 31, and the droop formula of the steel wire rope is as follows: f = qnL ² 8fh, wherein F is the tension of the steel wire rope; n is the number of the steel wire ropes; q is the linear density of the steel wire rope; fh is the sag of the steel cord. The rope sag formula can be used to derive that the tension required by the rope is proportional to the length of the rope, so that the tension required for tensioning the short luffing rope 32 is much less than the tension required for tensioning the long luffing rope 31. Under the condition that the amplitude-variable winding drum can not simultaneously tension the amplitude-variable short rope 32 and the amplitude-variable long rope 31, the system uses the tensioning device 20 driven by manpower to tension the amplitude-variable short rope 32, uses the amplitude-variable winding drum 30 driven by machinery to tension the amplitude-variable long rope 31, effectively reduces the tensioning force required by manually tensioning the amplitude-variable short rope 32, greatly reduces the labor intensity of operators using the amplitude-variable rope tensioning system, and has simple structure, easy arrangement and lower cost.

It should be noted that the luffing drum can only tension one of the short luffing rope 32 and the long luffing rope 31 by rotating, the short luffing rope 31 will loosen when the short luffing rope 32 is tensioned, and the short luffing rope 32 will loosen when the long luffing rope 31 is tensioned, so the short luffing rope must be tensioned by adding the tensioning device 20.

In the present embodiment, the first spool rotation direction of the luffing spool 30 enables the towing vehicle to move toward the arm-tip pulley 70, and rotation of the luffing spool 30 in the first spool rotation direction enables tensioning of the luffing rope 31. Specifically, when the luffing carriage is fixed at the root of the boom arm, the luffing drum 30 rotates in the first drum rotating direction to tension the luffing rope 31 because the luffing rope 31 cannot pull the frame 10; when the amplitude-variable trolley is not fixed, the amplitude-variable drum 30 can pull the amplitude-variable trolley to approach the arm tip of the crane arm by rotating along the first drum rotating direction, and similarly, the amplitude-variable drum 30 can pull the amplitude-variable trolley to approach the arm root of the crane arm by rotating along the first drum rotating direction.

In the embodiment of the present invention, as shown in fig. 3, the tensioning device 20 further includes a rotating shaft 22 and a U-shaped ear plate, the U-shaped ear plate includes two side plates 23 fixedly connected to the frame 10, the tensioning wheel 21 is clamped in a U-shaped groove between the two side plates 23, the rotating shaft 22 passes through the tensioning wheel 21 and the two side plates 23, and the U-shaped ear plate is used to hinge the tensioning wheel on the frame.

In the embodiment of the invention, the tensioning wheel 21 comprises a ratchet wheel 211, an intermediate circular wheel 212 and an outer circular wheel 213 which are distributed along the axial direction, the outer diameters of the ratchet wheel 211 and the outer circular wheel 213 are larger than the outer diameter of the intermediate circular wheel 212, so that a rope winding ring groove 214 surrounding the outer circumferential wall of the intermediate circular wheel 212 is formed on the tensioning wheel 21, and the existence of the rope winding ring groove 214 enables the variable-amplitude short rope 32 to be wound on the outer circumferential wall of the intermediate circular wheel 212 in a stable and orderly manner in a circle by circle manner, so that the variable-amplitude short rope 32 is prevented from falling off the tensioning wheel 21 to cause the rotation tensioning failure.

In an embodiment of the invention, the tensioning device 20 further comprises a ratchet stop 24, the ratchet stop 24 cooperating with a ratchet 211 to keep the luffing bridle 32 tensioned. Specifically, as shown in fig. 3, the ratchet wheel stopper 24 is pivotally mounted on the frame 10 and has a protrusion engaged with the ratchet wheel 211, and under the blocking of the ratchet wheel stopper 24, the ratchet wheel 211 can only rotate in the direction of tensioning the luffing short rope 32 and cannot rotate in the direction of loosening the luffing short rope 32, so that the luffing short rope 32 with tensioning force is prevented from pulling the tensioning wheel 21 to rotate in the direction of loosening and sagging of the luffing short rope 32, and the luffing short rope 32 is ensured to be in a continuously tensioned state.

In the embodiment of the present invention, the tensioning device 20 further includes a wrench 11, one end of the wrench 11 is sleeved on the rotating shaft 22, and the other end of the wrench extends out of a ratchet push rod 111 for pushing the teeth of the ratchet 211 to rotate. As shown in fig. 5 and 6, the wrench 11 further includes a round bar 112 capable of being engaged with the gear teeth of the ratchet wheel 211, and during specific operation, one end of the wrench 11 is sleeved on the rotating shaft 22, and the round bar 112 extends into the tooth space of the ratchet wheel 211 and abuts against the gear teeth, at this time, only the ratchet push rod 111 of the wrench 11 needs to be held to rotate the wrench 11 around the axis of the rotating shaft 22, and the round bar 112 pushes the gear teeth of the ratchet wheel 211 to enable the tensioning wheel 21 and the wrench 11 to rotate synchronously. In the above movement process, according to the basic theorem in physics, the torque of rotating the wrench 11 is equal to the torque of rotating the tensioning wheel 21, the radius of the tensioning wheel 21 is much smaller than the length of the wrench 11, and the length of the torque is determined by the inverse ratio of the torque to the stress, and the stress of the wrench 11 can be much smaller than the stress required by rotating the tensioning wheel 21.

In the embodiment of the invention, when the luffing rope tensioning system of the tower crane is in a non-working state, as shown in fig. 2, the wrench 11 is detachably mounted on the frame, and when the tensioning operation is required, an operator can take out the wrench 11 to assist in rotating the tensioning wheel 21.

In the embodiment of the present invention, the outer sidewall of the outer pulley 213 is provided with the rope end fixing portion 25 and the rope passing through hole 40, and the end portion of the short variable-amplitude rope 32 wound in the rope winding ring groove 214 passes through the rope passing through hole 40 and is connected to the rope end fixing portion 25, as shown in fig. 4, such a connection manner can enable the short variable-amplitude rope 32 to be more stably connected to the tensioning pulley 21, specifically, when the tensioning pulley 21 rotates to tension the short variable-amplitude rope 32, the reaction tension of the short variable-amplitude rope 32 to the tensioning pulley 21 will be mostly transferred to the outer circumferential wall of the rope passing through hole 40, and only a small portion of the reaction tension becomes the pressure between the end portion of the short variable-amplitude rope 32 and the rope end fixing portion 25, so as to reduce the tension of the short variable-amplitude rope 32 at the connection portion of the rope end fixing portion 25, prevent the unstable connection of the end portion caused by the excessive tension of the short variable-amplitude rope 32, and reduce the risk of the disconnection of the steel wire rope.

In the embodiment of the present invention, the rope end fixing part 25 includes a connecting block 251 and a protective cover 252, the connecting block 251 is fixedly disposed on the outer sidewall of the outer circular wheel 213, the protective cover 252 covers the connecting block 251 and is used for guiding the variable-amplitude short rope 32 through the rope through hole 40, and the protective cover 252 and the outer circular wheel 213 clamp the connecting block 251 and the end of the variable-amplitude short rope 32 together, so that the variable-amplitude short rope 32 cannot be disengaged from the clamping with the connecting block 251, thereby improving the connection stability of the variable-amplitude short rope 32.

In the embodiment of the invention, the luffing rope tensioning system of the tower crane further comprises a riding wheel 50 for preventing the luffing long rope 31 or the luffing short rope 32 from sagging, the riding wheel 50 is arranged between the luffing drum 30 and the arm tip pulley 70 or the arm root pulley 60, and when the tensioning force of the luffing long rope 31 or the luffing short rope 32 is insufficient, the riding wheel 50 supports the luffing rope to prevent the sagging of the luffing rope from interfering with components on the jib and influencing the normal operation of the jib.

In an embodiment of the present invention, a tower crane is further provided, which comprises the luffing rope tensioning system of the tower crane, and the crane has all the embodiments of the luffing rope tensioning system of the tower crane, so that the crane has the beneficial effects brought by all the embodiments.

In the description of the present invention, it is to be understood that the terms "first", "second" and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implying any number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless explicitly specified otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; may be mechanically coupled, may be electrically coupled or may be in communication with each other; they may be directly connected or indirectly connected through intervening media, or they may be interconnected within two elements or in a relationship where two elements interact with each other unless otherwise specifically limited. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.

Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.

Claims

1. A luffing rope tensioning system of a tower crane, comprising:

the amplitude variation trolley comprises a trolley frame (10) detachably mounted at the root of a boom of a tower crane, and a tensioning device (20) and a joint (12) which are fixedly connected to the trolley frame (10), wherein the tensioning device (20) comprises a tensioning wheel (21); and

the two ends of the amplitude-variable winding drum (30) are respectively connected with an amplitude-variable long rope (31) and an amplitude-variable short rope (32), the amplitude-variable long rope (31) penetrates through an arm tip pulley (70) located at the arm tip of a crane arm of the tower crane to be connected with the joint (12), the amplitude-variable short rope (32) penetrates through an arm root pulley (60) located at the arm root of the crane arm to be connected with the tension pulley (21), and the tension pulley (21) can rotationally tension the amplitude-variable short rope (32).

2. The luffing rope tensioning system of a tower crane according to claim 1, wherein a first reel rotation direction of the luffing reel (30) is capable of pulling the luffing carriage towards the jib tip pulley (70), and rotation of the luffing reel (30) in the first reel rotation direction is capable of tensioning the luffing rope (31).

3. The luffing rope tensioning system of a tower crane according to claim 1, wherein the tensioning device (20) further comprises a rotating shaft (22) and a U-shaped lug plate, the U-shaped lug plate comprises two side plates (23) fixedly connected with the frame (10), the tensioning wheel (21) is clamped in a U-shaped groove between the two side plates (23), and the rotating shaft (22) penetrates through the tensioning wheel (21) and the two side plates (23).

4. The luffing rope tensioning system of a tower crane according to claim 3, wherein the tensioning wheel (21) comprises a ratchet wheel (211), an intermediate circular wheel (212) and an outer circular wheel (213) which are distributed along the axial direction, and the outer diameters of the ratchet wheel (211) and the outer circular wheel (213) are larger than the outer diameter of the intermediate circular wheel (212), so that a rope winding ring groove surrounding the outer circumferential wall of the intermediate circular wheel (212) is formed on the tensioning wheel (21).

5. The luffing rope tensioning system of a tower crane according to claim 4, wherein the tensioning device (20) further comprises a ratchet dog (24), the ratchet dog (24) cooperating with the ratchet (211) to keep the luffing rope (32) tensioned.

6. The luffing rope tensioning system of a tower crane according to claim 4, wherein the tensioning device (20) further comprises a wrench (11), one end of the wrench (11) is sleeved on the rotating shaft (22), and the other end of the wrench extends out of a push rod (111) for pushing the gear teeth of the ratchet wheel (211) to rotate.

7. The luffing rope tensioning system of a tower crane according to claim 4, wherein the outer circumferential wheel (213) is provided at an outer circumferential wall thereof with a rope end fixing part (25) and a rope passing through hole (40), and an end of the luffing rope (32) wound in the rope winding ring groove is connected to the rope end fixing part (25) through the rope passing through hole (40).

8. The luffing line tensioning system of a tower crane according to claim 7, wherein the line end fixing part (25) comprises a connecting block (251) and a protective cover (252), the connecting block (251) being fixedly disposed on an outer sidewall of the outer round wheel (213), the protective cover (252) covering the connecting block (251) and serving to guide the luffing stub (32) to the line passing through hole (40).

9. The luffing rope tensioning system of a tower crane according to claim 1, further comprising an idler (50) for preventing the luffing rope (31) or the luffing rope (32) from sagging, the idler (50) being arranged between the luffing drum (30) and the jib tip pulley (70) or the jib root pulley (60).

10. A tower crane, characterized in that it comprises a luffing rope tensioning system of a tower crane according to any one of claims 1 to 9.