Automatic following pulley wire rope pressing device and crane

Abstract

The present invention discloses an automatic following pulley wire rope pressing device and a crane, which relate to the technical field of lifting equipment, solve the problem that the rope pressing point of the existing rope pressing device cannot adapt to change during the working process, and improve the service life of the wire rope. The specific scheme is as follows: it includes a rope pressing wheel arranged at the middle position of the top of the pulley, the rope pressing wheel is connected to the ear plates on both sides of the pulley through a mounting frame, the pulley is rotatably connected to the ear plate through a first rotating shaft, the rope pressing wheel is rotatably arranged on the mounting frame, the mounting frame and the ear plate are hinged to drive the rope pressing wheel to swing following the change of the wire rope angle, a block is fixed on the ear plate to limit the swing angle of the mounting frame, and the mounting frame is connected to the ear plate through a tension spring.

Description

Technical Field

[0001] The present invention relates to the technical field of lifting equipment, in particular to an automatic following pulley wire rope pressing device and a crane. Background Art

[0002] The crane equipment boom head pulley serves as the end winding device for the wire rope. When the four-link boom and single arm perform luffing motion, the wrap angle of the wire rope on the head pulley relative to the pulley will change significantly. When performing rotational motion, the wire rope has a more obvious tendency to slip out of the pulley groove laterally. Based on this, the wire rope must still have a rope pressing device to press the wire rope at the tangent position to the pulley circumference when the wrap angle changes to ensure that the wire rope will not slip out of the pulley groove.

[0003] The traditional rope pressing device can only ensure that the wire rope at one of the tangent points is pressed. The side cover is designed to surround the round steel along the circumference of the pulley rope groove to block the wire rope laterally (vertical to the pulley end face) to prevent it from slipping out (such as Figure 1 shown).

[0004] The inventors found that the wire rope will also be retracted and released while swinging sideways. The position of the rope pressing point in the above-mentioned existing rope pressing method is fixed, and it is impossible to ensure that the movement trajectory of the rope pressing point is an accurate arc line, which causes rapid wear of the fixed round steel and a certain degree of wear of the wire rope, affecting the service life of the wire rope. The existing rope pressing device with adjustable rope pressing wheel position (such as a grab ship unloader winch drum wire rope anti-disorder device - CN209177909U) can adjust the rope pressing point position, but requires manual cooperation, which is not suitable for use on the boom head of crane equipment. Summary of the Invention

[0005] In view of the shortcomings of the existing technology, the purpose of the present invention is to provide an automatic following pulley wire rope clamping device and a crane, in which a rotatable rope clamping wheel is arranged on the pulley, and the rope clamping wheel is rotatably connected to the ear plates on both sides of the pulley through a mounting frame, so that the rope clamping wheel can change its position according to the change of the angle of the wire rope, thereby ensuring that the wire rope is clamped at all times, solving the problem that the rope clamping point of the existing rope clamping device cannot adapt to the change during the working process.

[0006] In order to achieve the above object, the present invention is implemented through the following technical solutions:

[0007] In the first aspect, the present invention provides an automatic following pulley wire rope pressing device, comprising a rope pressing wheel arranged at the middle position of the top of the pulley, the rope pressing wheel being connected to the ear plates on both sides of the pulley through a mounting frame, the pulley being rotatably connected to the ear plates through a first rotating shaft, the rope pressing wheel being rotatably arranged on the mounting frame, the mounting frame and the ear plates being hinged to drive the rope pressing wheel to swing following the change in the angle of the wire rope, a block for limiting the swing angle of the mounting frame being fixed on the ear plates, and the mounting frame being connected to the ear plates through a tension spring.

[0008] As a further implementation method, the rope pressing wheel is a groove wheel structure, and a circumferential groove for limiting the wire rope is provided on the outer surface.

[0009] As a further implementation method, the mounting frame is composed of two mounting frame units arranged opposite to each other on both sides of the pulley, each mounting frame unit is composed of a first crank, a second crank and a third crank, the first crank and the second crank are arranged opposite to each other and the bottom ends of both are rotatably connected to the ear plate through the second rotating shaft, and the two ends of the third crank are respectively hinged to the top ends of the first crank and the second crank.

[0010] As a further implementation method, the second rotating shaft is fixedly connected to the ear plate by a threaded connection, and a protrusion is provided along its circumferential direction at the position where the second rotating shaft is connected to the first crank / second crank. The protrusion is rotatably connected to the mounting hole on the first crank / second crank, and threaded holes are provided on both sides of the protrusion for fixing the end plate.

[0011] As a further implementation, the end plates are relatively arranged on both sides of the first crank / second crank and are in close contact with the adjacent first crank / second crank.

[0012] As a further implementation method, the two third cranks are connected by a connecting shaft, both ends of the connecting shaft are fixedly connected to the third cranks, a bearing is fixedly provided on the connecting shaft, and the inner ring of the rope pressure wheel is fixedly connected to the outer ring of the bearing.

[0013] As a further implementation, two baffles are fixedly provided on the connecting shaft, and the two baffles are arranged on both sides of the bearing opposite to each other.

[0014] As a further implementation method, two first stops are fixed on the ear plate, and the two first stops are relatively arranged on both sides of the first crank / second crank. A second stop that cooperates with the first stop is fixed on the first crank / second crank, and the second stop is located between the two first stops.

[0015] As a further implementation manner, the first crank and / or the second crank is connected to the ear plate via a tension spring.

[0016] In the second aspect, an embodiment of the present invention provides a crane, including a pulley, which is fixedly arranged on the head of the crane equipment boom through an ear plate to serve as an end winding device of the wire rope, the pulley is rotatably connected to the ear plate through a first rotating shaft, and the automatic following pulley wire rope pressing device is rotatably connected to the ear plate through a second rotating shaft.

[0017] The beneficial effects of the present invention are as follows:

[0018] (1) The present invention provides a rotatable rope-pressing wheel on the pulley, and rolling friction occurs between the rope-pressing wheel and the wire rope. The rope-pressing wheel is rotatably connected to the ear plates on both sides of the pulley through the mounting frame, so that the rope-pressing wheel can change its position as the angle of the wire rope changes, so that the rope-pressing wheel always presses the tangent point of the wire rope outlet and the rope groove circle of the pulley, ensuring that the movement trajectory of the rope-pressing point is a precise circular arc line, that is, during the working process, the rope-pressing mechanism is always ensured in the lateral direction and the normal direction of the rope groove circumference, effectively avoiding the shedding and side swing of the wire rope, and improving the service life of the wire rope and the pulley and other structures.

[0019] (2) The present invention connects the mounting frame and the ear plate through a tension spring, so that the mounting frame can automatically follow the swing of the wire rope. At the same time, a stopper is provided to limit the swing angle of the mounting frame, thereby effectively avoiding damage to the tension spring and ensuring the self-following ability of the mounting frame.

[0020] (3) The stopper of the present invention can not only limit the swing angle of the mounting frame, but also play an emergency role. When the tension spring is damaged, the stopper can make the steel wire rope only push the mounting frame to the extreme position of swinging, effectively preventing the steel wire rope from escaping from the restriction of the rope pulley when the tension spring is damaged.

[0021] (4) The present invention utilizes the end plate to limit the axial movement of the second rotating shaft, effectively preventing the second rotating shaft from falling off from the first crank / second crank, and ensuring the installation stability of the mounting frame.

[0022] (5) The present invention provides a baffle on the connecting shaft, which is used to limit the axial movement of the bearing along the connecting shaft, thereby limiting the position of the rope-pressing wheel and ensuring that the rope-pressing wheel can effectively press and limit the wire rope.

[0023] (6) The second rotating shaft of the present invention is arranged on the ear plate and is not coaxial with the first rotating shaft, which effectively avoids interference with and obstruction of the lubricating oil hole of the first rotating shaft and facilitates the maintenance of the first rotating shaft. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The accompanying drawings, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0025] Figure 1It is a structural diagram of a traditional rope pressing device improved in the background technology of the present invention;

[0026] Figure 2 1 is a schematic diagram of the main structure of an automatic following pulley wire rope pressing device according to one or more embodiments of the present invention;

[0027] Figure 3 1 is a schematic side view of an automatic follow-up pulley wire rope pressing device according to one or more embodiments of the present invention;

[0028] Figure 4 is a schematic structural diagram of a second rotating shaft according to one or more embodiments of the present invention;

[0029] Figure 5 is a schematic structural diagram of an end plate according to one or more embodiments of the present invention;

[0030] Figure 6 1 is a schematic structural diagram of a working state of an automatic following pulley wire rope pressing device according to one or more embodiments of the present invention;

[0031] Figure 7 2. It is a schematic structural diagram of another working state of an automatic following pulley wire rope pressing device according to one or more embodiments of the present invention;

[0032] In the figure: the distances or sizes between parts are exaggerated to show the positions of the parts, and the diagram is for illustration only;

[0033] Among them, 1. pulley; 2. ear plate; 3. clamping shaft plate; 4. first rotating shaft; 5. wire rope; 6. second rotating shaft; 601. threaded hole; 602. threaded shaft; 7. end plate; 8. first crank; 9. second crank; 10. third crank; 11. bearing; 12. rope pressure wheel; 13. tension spring; 14. first stop; 15. connecting shaft; 16. tension spring fixing seat; 17. second stop; 18. cover. DETAILED DESCRIPTION

[0034] It should be noted that the following detailed description is illustrative and is intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used in the present invention have the same meaning as commonly understood by those skilled in the art to which the present invention belongs.

[0035] As introduced in the background technology, the wire rope will also have a retraction and extension action while swinging sideways. The position of the rope pressing point of the above-mentioned existing rope pressing method is fixed, and it is impossible to ensure that the movement trajectory of the rope pressing point is an accurate circular arc, which causes the fixed round steel to wear quickly, and the wire rope will also be subject to a certain degree of wear, affecting the service life of the wire rope; and the existing rope pressing device with adjustable rope pressing wheel position, although it can adjust the position of the rope pressing point, requires manual cooperation, which is not suitable for the use of the boom head of the crane equipment. In order to solve the above technical problems, the present invention proposes an automatic following pulley wire rope pressing device and a crane.

[0036] Example 1

[0037] In a typical embodiment of the present invention, Figure 2-Figure 7 As shown, an automatic following pulley wire rope pressing device is proposed, including a rope pressing wheel 12 arranged at the middle position of the top of the pulley 1, and the rope pressing wheel 12 is connected to the ear plate 2 on the side of the pulley 1 through a mounting frame. The rope pressing wheel 12 is rotatably set on the mounting frame to be used for pressing and limiting the wire rope 5 on the pulley 1. The mounting frame and the ear plate 2 are hinged and can swing according to the angle change of the wire rope 5 to ensure that the rope pressing wheel 12 always presses the wire rope 5. A first stopper 14 is fixedly provided on the ear plate 2, and a second stopper 17 cooperating with the first stopper is fixedly provided on the mounting frame to limit the swinging angle of the mounting frame. The mounting frame is also connected to the ear plate 2 on the pulley 1 through a tension spring 13, so that the mounting frame has the ability to automatically follow.

[0038] Specifically, the ear plates 2 are fixed on both sides of the pulley 1, and the pulley 1 is fixed on the boom head of the crane equipment through the ear plates 2. The ear plates 2 and the pulley 1 are rotatably connected through the first rotating shaft 4, so that the pulley 1 can rotate around the axis.

[0039] The rope-pressing wheel 12 is arranged at the middle position of the top of the pulley 1. The rope-pressing wheel 12 is a groove wheel structure, and a circumferential groove for limiting the position of the wire rope 5 is provided on the outer surface. The wire rope 5 is located directly below the circumferential groove on the rope-pressing wheel 12 to limit the position of the wire rope 5 through the circumferential groove to prevent it from swinging sideways.

[0040] Under normal working conditions, the rope-pressing wheel 12 is not in contact with the pulley 1. When the wire rope 5 hits the rope-pressing wheel 12, the rope-pressing wheel 12 will swing along with the mounting frame, and when the wire rope 5 is pulled, the rope-pressing wheel 12 will rotate around the axis.

[0041] The mounting frame is rotatably connected to the ear plate 2 via the second rotating shaft 6 , the position of the second rotating shaft 6 is limited by the clamping shaft plate 3 , and the clamping shaft plate 3 is fixedly connected to the ear plate 2 by welding, bolting, or the like.

[0042] The mounting frame consists of a first crank 8, a second crank 9 and a third crank 10. There are two of each of the first crank 8, the second crank 9 and the third crank 10. One first crank 8, one second crank 9 and one third crank 10 together constitute a mounting frame unit, and the two mounting frame units are relatively arranged on both sides of the pulley 1.

[0043] Among them, the first crank 8 and the second crank 9 in each mounting frame unit are arranged opposite to each other, the bottom ends of the first crank 8 and the second crank 9 are rotatably connected to the ear plate 2 through the second rotating shaft 6, and the top ends of the first crank 8 and the second crank 9 are connected through the third crank 10, and the third crank 10 is hinged to the first crank 8 and the second crank 9 to form a crank-connecting rod mechanism.

[0044] The end of the second rotating shaft 6 connected to the ear plate 2 is limited in position by the clamping shaft plate 3, and the end of the second rotating shaft 6 connected to the first crank 8 / second crank 9 is limited in position by the end plate 7 to prevent the second rotating shaft 6 from falling off.

[0045] like Figure 4 As shown, one end of the second rotating shaft 6 connected to the ear plate 2 is a threaded shaft 602, which is fixedly connected to the ear plate 2 by a threaded connection. A protrusion is provided along its circumferential direction at the position where the second rotating shaft 6 is connected to the first crank 8 / second crank 9. A mounting hole for installing the protrusion is provided on the first crank 8 / second crank 9. The protrusion and the mounting hole are rotatably connected. Threaded holes 601 are provided on both sides of the protrusion for fixed installation of the end plate 7.

[0046] like Figure 5 As shown, the end plate 7 is a boss structure, and a threaded hole is also provided on the end plate 7. The threaded holes on the end plate 7 correspond one-to-one to the threaded holes 601 on the second rotating shaft 6. An end plate 7 is provided on both sides of the protrusion on each second rotating shaft 6. The end plate 7 and the second rotating shaft 6 are fixed by bolts to limit the position of the second rotating shaft 6. The two end plates 7 are relatively arranged on both sides of the first crank 8 / second crank 9 and are tightly attached to the adjacent first crank 8 / second crank 9 to prevent the second rotating shaft 6 from moving axially and falling off.

[0047] It should be noted that the second rotating shaft 6 is arranged on the ear plate 2 and is not coaxial with the first rotating shaft 4 to avoid interference with or blocking the lubricating oil hole of the first rotating shaft 4 .

[0048] The two mounting frame units are connected by a connecting shaft 15. Specifically, the two third cranks 10 are connected by a connecting shaft 15. Both ends of the connecting shaft 15 are fixedly connected to the third cranks 10. A bearing 11 is fixedly provided at the middle position of the connecting shaft 15, and the rope pressure wheel 12 is installed on the bearing 11.

[0049] Among them, the inner ring of the bearing 11 is fixedly connected to the outer surface of the connecting shaft 15, and the outer ring of the bearing 11 is fixedly connected to the inner ring of the rope pressing wheel 12, so that the rope pressing wheel 12 can rotate around the axial direction of the connecting shaft 15.

[0050] In order to limit the axial movement of the rope pulley 12, baffles are fixed on both sides of the rope pulley 12, and the baffles are fixed on the connecting shaft 15. At the same time, a boss is processed on the inner ring of the rope pulley 12, and a groove that cooperates with the boss is processed on the outer ring of the bearing 11. The axial movement of the rope pulley 12 is prevented by the cooperation between the boss and the groove and the limitation of the baffle.

[0051] A tension spring fixing seat 16 is fixed on the inner surface of the first crank 8 and the second crank 9, that is, on the surface of the first crank 8 and the second crank 9 close to the pulley 1, for installing the tension spring 13. Similarly, a tension spring fixing seat 16 is also provided on the ear plate 2. The first crank 8 and / or the second crank 9 is connected to the ear plate 2 through the tension spring 13, so that the mounting frame can automatically swing with the wire rope to ensure that the pressure wheel and the wire rope are always close.

[0052] Two first stops 14 are also fixedly provided on the ear plate 2 . The two first stops 14 are fixedly provided on both sides of the first crank 8 / the second crank 9 to limit the swing angle of the first crank 8 / the second crank 9 .

[0053] Correspondingly, a second stop 17 that cooperates with the first stop 14 is fixed on the inner surface of the first crank 8 / the second crank 9. The second stop 17 is located between the two first stops 14. When the first crank 8 and the second crank 9 swing, the swing angle of the second stop 17 can be limited by the first stop 14, thereby limiting the swing angle of the entire mounting frame.

[0054] It is understandable that the setting positions of the two first blocks 14 are determined according to the circumferential range of the tangent point between the wire rope and the pulley 1, and can be specifically set according to actual needs, and no excessive restrictions are imposed here.

[0055] Since both mounting frame units of the mounting frame are crank-connecting rod structures, the rope-pressing wheel 12 can always press the tangent point between the wire rope outlet and the rope groove circle of the pulley 1, ensuring that the movement trajectory of the rope-pressing point is a precise arc line, that is, during the working process, the rope-pressing mechanism is always present in the lateral direction and the normal direction of the rope groove circumference, effectively avoiding the falling off and lateral swing of the wire rope 5, and avoiding damage to the structures such as the wire rope 5 and the pulley 1.

[0056] At the same time, in this embodiment, the wire rope 5 is compressed and limited by the rope pressing wheel 12, and the friction mode of the contact position with the wire rope 5 is rolling friction. No wear occurs between the rope pressing wheel 12 and the wire rope 6, which effectively ensures the service life of the wire rope 5.

[0057] Example 2

[0058] In a typical embodiment of the present invention, a crane is proposed, comprising the automatic following pulley wire rope pressing device described in Example 1, wherein the automatic following pulley wire rope pressing device is arranged at the pulley 1 at the head of the crane equipment boom.

[0059] Specifically, the pulley 1 at the head of the crane equipment boom serves as the end winding device of the wire rope. The pulley 1 is fixedly set at the head of the crane equipment boom through the ear plate 2. The pulley 1 is rotatably connected to the ear plate 2 through the first rotating shaft 4, and the mounting frame is rotatably connected to the ear plate 2 through the second rotating shaft 6.

[0060] The rope-pressing wheel 12 is arranged at the middle position of the top of the pulley 1 (in the non-working state), and the wire rope 5 is located just below the circumferential groove on the rope-pressing wheel 12, so as to limit the position of the wire rope 5 through the circumferential groove to prevent it from swinging sideways.

[0061] The foregoing description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention are intended to be within the scope of protection of the present invention.

Claims

1. An automatic follow-up pulley wire rope pressing device, characterized in that: The pulley comprises a rope-pressing wheel arranged at the middle position of the top of the pulley, the rope-pressing wheel is connected to the ear plates on both sides of the pulley through a mounting frame, the pulley is rotatably connected to the ear plates through a first rotating shaft, the rope-pressing wheel is rotatably arranged on the mounting frame, the mounting frame and the ear plates are hinged to drive the rope-pressing wheel to swing following the change of the angle of the wire rope, a block is fixed on the ear plate to limit the swing angle of the mounting frame, and the mounting frame is connected to the ear plate through a tension spring; The mounting frame is composed of two mounting frame units arranged opposite to each other on both sides of the pulley, each mounting frame unit is composed of a first crank, a second crank and a third crank, the first crank and the second crank are arranged opposite to each other and the bottom ends of the first crank and the second crank are rotatably connected to the ear plate through the second rotating shaft, and the two ends of the third crank are respectively hinged to the top ends of the first crank and the second crank; The second rotating shaft is fixedly connected to the ear plate by a threaded connection. A protrusion is provided along its circumferential direction at the position where the second rotating shaft is connected to the first crank / second crank. The protrusion is rotatably connected to the mounting hole on the first crank / second crank. Threaded holes for fixing the end plate are provided on both sides of the protrusion. The end plates are arranged opposite to each other on both sides of the first crank / second crank and are in close contact with the adjacent first crank / second crank; The two third cranks are connected via a connecting shaft, both ends of the connecting shaft are fixedly connected to the third cranks, a bearing is fixedly provided on the connecting shaft, and the inner ring of the rope pressure wheel is fixedly connected to the outer ring of the bearing.

2. The automatic following pulley wire rope pressing device according to claim 1, characterized in that: The rope pressing wheel is a groove wheel structure, and a circumferential groove for limiting the position of the steel wire rope is provided on the outer surface.

3. The automatic following pulley wire rope pressing device according to claim 1, characterized in that: Two baffles are fixedly provided on the connecting shaft, and the two baffles are arranged oppositely on both sides of the bearing.

4. The automatic following pulley wire rope pressing device according to claim 1, characterized in that: Two first stops are fixedly provided on the ear plate, and the two first stops are arranged oppositely on both sides of the first crank / second crank. A second stop that cooperates with the first stop is fixedly provided on the first crank / second crank, and the second stop is located between the two first stops.

5. The automatic following pulley wire rope pressing device according to claim 1, characterized in that: The first crank and / or the second crank are connected to the lug plate via a tension spring.

6. A crane utilizing an automatic following pulley wire rope pressing device according to any one of claims 1 to 5, characterized in that: It includes a pulley, which is fixedly arranged on the head of the crane equipment boom through an ear plate to serve as an end winding device for the wire rope. The pulley is rotatably connected to the ear plate through a first rotating shaft, and the automatic following pulley wire rope pressing device mounting frame is rotatably connected to the ear plate through a second rotating shaft.

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