A luffing trolley tensioning device

Abstract

This utility model relates to the field of crane technology, specifically a luffing trolley cable tensioning device. A bracket is rotatably mounted with a first clamp; a ratchet is rotatably mounted on the bracket via a first pin, and the ratchet cooperates with the first clamp to prevent the ratchet from rotating in a first direction; a rocker arm has a first end and a second end that are far apart from each other, the first end being rotatably connected to the first pin, and a second clamp rotatably mounted between the first and second ends, cooperating with the ratchet to push the ratchet to rotate in a second direction; one end of a tension spring is connected to the bracket, and the other end is connected to the rocker arm; a mechanical limit block is connected to a drive device to reciprocate between a first position and a second position. In the first position, the mechanical limit block contacts the second end; in the second position, the mechanical limit block disengages from the second end. This utility model can prevent the wire rope from being too loose or too tight.

Description

Technical Field

[0001] This utility model relates to the field of crane technology, specifically to a luffing trolley tensioning device. Background Technology

[0002] The luffing trolley is a device in boom cranes that moves back and forth along the boom. Its core function is to adjust the position of the lifted load by changing the horizontal distance between the hook and the crane's rotation center. The luffing trolley's movement is driven by the winding and unwinding of a traction wire rope. If this rope is slack, the rotation of the motor drum cannot be translated into timely and accurate trolley movement, resulting in sluggish trolley movement, vibration, or even failure to start. Therefore, the traction wire rope needs to be tensioned.

[0003] Currently, the tensioner for luffing trolleys includes a helical tensioning device, which adjusts the position of the tensioning wheel by adjusting the nut on the screw, thereby tightening the wire rope. This method requires regular manual inspection and adjustment, and cannot achieve automatic compensation. If maintenance is inadequate, the wire rope may become too loose or too tight. Utility Model Content

[0004] In view of the deficiencies of the prior art, this utility model provides a luffing trolley rope tightening device, which can drive the ratchet to rotate by the reciprocating movement of the mechanical limit block. During this process, the tension spring applies a pre-tension force to achieve the purpose of tightening the wire rope. Since the tension provided by the tension spring can be automatically adjusted, it can prevent the wire rope from being too loose or too tight.

[0005] To achieve the above objectives, the present invention provides a luffing trolley rope tightening device, comprising a bracket, a ratchet, a rocker arm, a tension spring, and a mechanical limiting block. The bracket is rotatably equipped with a first retainer. The ratchet is rotatably mounted on the bracket via a first pin, and the ratchet cooperates with the first retainer to prevent the ratchet from rotating in a first direction. The rocker arm has a first end and a second end that are far apart from each other. The first end is rotatably connected to the first pin, and a second retainer is rotatably mounted between the first end and the second end. The second retainer cooperates with the ratchet to push the ratchet to rotate in a second direction. One end of the tension spring is connected to the bracket, and the other end is connected to the rocker arm. The mechanical limiting block is connected to a driving device to reciprocate between a first position and a second position. In the first position, the mechanical limiting block contacts the second end; in the second position, the mechanical limiting block disengages from the second end.

[0006] Furthermore, the second card holder is positioned near the midpoint of the line connecting the first end and the second end.

[0007] Furthermore, the bracket is provided with a second connecting plate, and one end of the tension spring is detachably connected to the second connecting plate; the rocker arm is provided with a third connecting plate, and the other end of the tension spring is detachably connected to the third connecting plate.

[0008] Furthermore, the third connecting plate is disposed between the second end and the second card holder.

[0009] Furthermore, a roller is rotatably connected to the second end, and the roller is used to make rolling contact with the mechanical limiting block.

[0010] Furthermore, the angle between the plane containing the axis of the first pin and the axis of the roller and the horizontal plane is greater than or equal to 70°.

[0011] Furthermore, the first card holder includes a second pin disposed on the bracket, two first connecting plates connected to the second pin and arranged parallel to each other, and a first connecting rod disposed between the two first connecting plates, the first connecting rod cooperating with the ratchet.

[0012] Furthermore, when the bracket is placed horizontally, the angle between the plane containing the axis of the second pin and the axis of the first connecting rod and the horizontal plane is 33°.

[0013] Furthermore, the driving device includes a variable frequency drive motor and a lead screw and nut mechanism connected to the variable frequency drive motor, and the output end of the lead screw and nut mechanism is connected to the mechanical limit block.

[0014] The beneficial effects of this utility model are: it can drive the ratchet to rotate by the reciprocating movement of the mechanical limit block, and the tension spring applies pre-tension force during this process to achieve the purpose of tightening the wire rope. Because the force provided by the tension spring can be automatically adjusted, the wire rope is prevented from being too loose or too tight. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of a luffing trolley tensioning device in one embodiment of the present invention; Figure 2 This is a top view of a luffing trolley tensioning device according to one embodiment of the present invention; Figure 3 for Figure 1 Sectional view of AA; Figure 4 This is a schematic diagram showing the switching between two states of a luffing trolley tensioning device in one embodiment of the present invention; In the picture: 100. Bracket; 110. First bracket; 111. Second pin; 1111. First spacer; 112. First connecting plate; 113. First connecting rod; 120. Second connecting plate. 200. Ratchet; 210. First pin; 211. Second spacer. 300. Joystick; 310. First end; 320. Second end; 321. Roller; 3211. Shaft; 3212. Shaft retaining ring; 330. Second bracket; 340. Third connecting plate; 350. Main body; 360. Upper bracket. 400. Tension spring. 500. Mechanical limit stop block. 10. First position, 20. Second position. Detailed Implementation

[0016] To make the above-mentioned objects, features, and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a full understanding of this utility model. However, this utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this utility model. Therefore, this utility model is not limited to the specific embodiments disclosed below.

[0017] See Figure 1 The diagram shows a structural schematic of a luffing trolley tensioning device, which includes a bracket 100, a ratchet 200, a rocker arm 300, a tension spring 400, and a mechanical limit stop 500. The bracket 100 is rotatably equipped with a first retainer 110. The ratchet 200 is rotatably mounted on the bracket 100 via a first pin 210. The ratchet 200 cooperates with the first retainer 110 to prevent the ratchet 200 from rotating in a first direction, which in this embodiment is clockwise. The rocker arm 300 has a first end 310 and a second end 320 that are far apart from each other. The first end 310 is rotatably connected to the first pin 210. A second bracket 330 is rotatably disposed between the first end 310 and the second end 320. The second bracket 330 cooperates with the ratchet 200 to push the ratchet 200 to rotate in a second direction, which is counterclockwise in this embodiment. One end of the tension spring 400 is connected to the bracket 100, and the other end is connected to the rocker arm 300. The mechanical limit block 500 is connected to the drive device to reciprocate between the first position 10 and the second position 20. In the first position 10, the mechanical limit block 500 contacts the second end 320, and in the second position 20, the mechanical limit block 500 disengages from the second end 320.

[0018] In use, when the mechanical limit block 500 is in the second position 20 and is not in contact with the second end 320, the tension spring 400 is in its natural state. Under the action of the drive device, the mechanical limit block 500 moves horizontally from the second position 20 to the first position 10. During this process, the mechanical limit block 500 contacts and presses against the second end 320, the tension spring 400 is stretched, the second bracket 330 falls into the next ratchet 200 tooth, the mechanical limit block 500 moves horizontally, the mechanical limit block 500 disengages from the second end 320, and moves from the first position 10 to the second position 20. The tension spring 400 contracts, the rocker arm 300 swings counterclockwise, and the second bracket 330 pushes the ratchet 200 to rotate in the second direction, i.e., counterclockwise. The rotation of the ratchet 200 can drive the wire rope to tighten, completing the luffing trolley rope tightening operation.

[0019] The aforementioned luffing trolley tensioning device can drive the ratchet 200 to rotate by the reciprocating movement of the mechanical limit stop 500. During this process, the tension spring 400 applies a pre-tension force to achieve the purpose of tightening the wire rope. Since the force provided by the tension spring 400 can be automatically adjusted, the wire rope is prevented from being too loose or too tight.

[0020] See Figure 3 In one embodiment, the second holder 330 is positioned near the midpoint of the line connecting the first end 310 and the second end 320. Specifically, the rocker arm 300 includes a main body 350 and an upper bracket 360 fixed to the upper part of the main body 350. The second end 320 is the top of the upper bracket 360, and the second holder 330 is rotatably mounted on the main body 350 via a pin. In this embodiment, rollers 321 are independently provided for the second holder 330 and the second end 320. The upper bracket 360 is used to pull the second holder 330 and the second end 320 apart by a reasonable distance, that is, to increase the distance between the second holder 330 and the mechanical limit stop 500, thereby providing space for parts disassembly and maintenance. In addition, when the drive device is set in a higher position, a higher upper bracket 360 can be installed to raise the position of the second end 320 to accommodate the position of the mechanical limit stop 500.

[0021] In one embodiment, the bracket 100 is provided with a second connecting plate 120, and one end of the tension spring 400 is detachably connected to the second connecting plate 120; the rocker arm 300 is provided with a third connecting plate 340, and the other end of the tension spring 400 is detachably connected to the third connecting plate 340. This arrangement increases the distance between the second end 320 and the second bracket 330, which in turn increases the distance between the mechanical limit stop 500 and the ratchet 200. This makes the parts of the entire device more dispersed, providing space and convenience for maintenance and replacement. For example, when the tension spring 400 or the ratchet 200 is fatigued and needs to be replaced, there is sufficient space between the tension spring 400, the ratchet 200, and the mechanical limit stop 500 for the operator to move around, facilitating maintenance and replacement.

[0022] In one embodiment, the third connecting plate 340 is disposed between the second end 320 and the second card holder 330.

[0023] like Figure 3 In one embodiment, a roller 321 is rotatably connected to the second end 320, and the roller 321 is used to roll into contact with the mechanical limit stop 500. Specifically, the roller 321 is connected to the second end 320 via a shaft 3211, and a shaft retaining ring 3212 is provided between the end of the shaft 3211 and the second end 320 of the rocker arm 300. In this embodiment, the shaft retaining ring 3212 acts as a barrier between the shaft 3211 and the rocker arm 300, preventing wear from relative movement between them.

[0024] In one embodiment, the angle between the plane containing the axis of the first pin 210 and the axis of the roller 321 and the horizontal plane is greater than or equal to 70°.

[0025] See Figure 2 In one embodiment, the first card holder 110 includes a second pin 111 rotatably mounted on the bracket 100, two first connecting plates 112 connected to the second pin 111 and arranged parallel to each other, and a first connecting rod 113 disposed between the two first connecting plates 112, the first connecting rod 113 cooperating with a ratchet 200. Specifically, a first spacer 1111 is sleeved on the second pin 111, the first spacer 1111 being disposed between the first connecting plates 112 and the side wall of the bracket 100, serving as a spacer and limiting element. Further, in a specific configuration, such as... Figure 1 As shown, a second spacer 211 is fitted onto the first pin 210. The second spacer 211 is located between the ratchet 200 and the side wall of the bracket 100, and also serves to separate and limit the movement.

[0026] In one embodiment, when the bracket 100 is placed horizontally, the angle between the plane containing the axis of the second pin 111 and the axis of the first connecting rod 113 and the horizontal plane is 33°.

[0027] In one embodiment, the drive device includes a variable frequency drive motor and a lead screw and nut mechanism connected to the variable frequency drive motor, and the output end of the lead screw and nut mechanism is connected to a mechanical limit block 500.

[0028] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0029] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0030] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0031] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature. It should be noted that when an element is referred to as "fixed to" or "set on" another element, it can be directly on the other element or there may be an intermediate element present. When an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be an intermediate element present. The terms "vertical," "horizontal," "above," "below," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible embodiments.

Claims

1. A luffing carriage tight line device, characterized by: include The bracket is rotatably equipped with a first card holder; A ratchet is rotatably mounted on the bracket via a first pin. The ratchet engages with the first card holder to prevent the ratchet from rotating in a first direction. A rocker arm has a first end and a second end that are far apart from each other. The first end is rotatably connected to a first pin. A second bracket is rotatably disposed between the first end and the second end. The second bracket cooperates with the ratchet to push the ratchet to rotate in a second direction. A tension spring, one end of which is connected to the bracket and the other end of which is connected to the rocker arm; A mechanical limit block is connected to a drive device to reciprocate between a first position and a second position. In the first position, the mechanical limit block is in contact with the second end, and in the second position, the mechanical limit block is disengaged from the second end.

2. A tight line device for a luffing carriage according to claim 1, characterized in that The second card holder is positioned near the midpoint of the line connecting the first end and the second end.

3. A tight line device for a luffing carriage according to claim 2, characterized in that: The bracket is provided with a second connecting plate, and one end of the tension spring is detachably connected to the second connecting plate; the rocker arm is provided with a third connecting plate, and the other end of the tension spring is detachably connected to the third connecting plate.

4. A tight line device for a luffing carriage according to claim 3, characterized in that: The third connecting plate is disposed between the second end and the second card holder.

5. A tight line device for a yoke according to any one of claims 1 to 3, wherein: The second end is rotatably connected to a roller, which is used to make rolling contact with the mechanical limit block.

6. A tight line device for a tilt-up carriage as defined in claim 5, wherein: The angle between the plane containing the axis of the first pin and the axis of the roller and the horizontal plane is greater than or equal to 70°.

7. A tight line device for a yoke according to any one of claims 1 to 3, wherein: The first card holder includes a second pin disposed on the bracket, two first connecting plates connected to the second pin and arranged parallel to each other, and a first connecting rod disposed between the two first connecting plates, the first connecting rod cooperating with the ratchet.

8. The luffing trolley tensioning device according to claim 7, characterized in that: When the bracket is placed horizontally, the angle between the plane containing the axis of the second pin and the axis of the first connecting rod and the horizontal plane is 33°.

9. A tight line device for a yoke according to any one of claims 1-3, characterized in that: The drive device includes a variable frequency drive motor and a lead screw and nut mechanism connected to the variable frequency drive motor. The output end of the lead screw and nut mechanism is connected to the mechanical limit block.

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