Tightness adjusting device for telescopic arm rope of lorry-mounted crane

Abstract

A tightness adjusting device for a boom-retracting rope of a lorry-mounted crane belongs to the technical field of cranes, and is characterized by comprising a fixed wheel, a fixed wheel, a fixed wheel and a fixed wheel, and the boom-retracting rope is wound around the fixed wheel; the fixed wheel is fixedly mounted on the guide wheel frame; the fixed plate is fixedly mounted on a suspension arm cylinder of the crane; the transmission mechanism is connected with the fixing plate and the guide wheel frame; the rocker drives the transmission mechanism through the rocker to drive the guide wheel frame to move, and tensioning of the arm retracting rope is achieved. According to the utility model, the rocker can adjust the tightness of the arm retracting rope outside the arm body, so that the problem that the position of the arm retracting rope is inconvenient to adjust is solved, and the adjusting space is wider and more comfortable; through gear meshing transmission, the problem that adjustment of the arm retracting rope is strenuous is solved, the large transmission ratio range is achieved, more labor is saved, and the adjusting efficiency is higher; the fixing plate is arranged at the position close to the boom head of the boom cylinder, the problem that the adjusting amount of the boom retracting rope is small is solved, and the adjustable stroke of the boom retracting rope is increased.

Description

Technical Field

[0001] The utility model relates to a device for adjusting the tightness of a retractable boom rope of a truck-mounted crane, belonging to the technical field of cranes. Background Art

[0002] In a truck-mounted crane, after the telescopic boom has been telescoped relative to the basic boom for many times, the elongation rate of the retractable boom rope changes, resulting in a decrease in the tightness of the retractable boom rope. This not only makes the retractable boom rope loose, but also affects the smoothness of the telescopic boom during retraction. Unstable retraction will affect work efficiency and may even cause damage to the lifted equipment.

[0003] Since the retractable boom rope is fixed inside the boom cylinder, and the internal space of the boom cylinder is limited and belongs to a semi-closed cylinder, it is extremely difficult to adjust the tightness of the retractable boom rope. For the adjustment of the tightness of the retractable boom rope, traditional adjustment methods require a wrench to be inserted into the boom cylinder or special tools to be used in cooperation with power tools for adjustment, which is extremely laborious and inconvenient for the user. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a device for adjusting the tightness of a retractable boom rope of a truck-mounted crane in view of the above-mentioned deficiencies of the prior art, which provides a larger operating space for adjusting the tightness of the retractable boom rope, is convenient and fast, guarantees the smoothness of the telescopic boom during retraction, and improves work efficiency.

[0005] In order to provide a larger operating space for adjusting the tightness of the retractable boom rope, the utility model provides a device for adjusting the tightness of a retractable boom rope of a truck-mounted crane, which is characterized by including:

[0006] A fixed pulley around which the retractable boom rope passes;

[0007] A guide pulley frame on which the fixed pulley is fixedly installed;

[0008] A fixing plate fixedly installed on the boom cylinder of the crane;

[0009] A transmission mechanism connecting the fixing plate and the guide pulley frame;

[0010] A rocker arm that drives the transmission mechanism through the rocker arm to drive the displacement of the guide pulley frame to achieve the tensioning of the retractable boom rope.

[0011] In the above solution, when the retractable boom rope is installed, it passes around the fixed pulley. The fixed pulley is installed on the guide pulley frame, and the guide pulley frame is located in the internal space of the boom cylinder. The fixing plate is welded at a position close to the boom head of the boom cylinder, which can increase the adjustment amount of the retractable boom rope. The rocker arm is located outside the boom cylinder, so a larger operating space can be obtained. The transmission mechanism is driven by the rocker arm to cause the guide pulley frame to undergo a linear displacement, driving the fixed pulley to move linearly accordingly, and finally adjusting the tightness of the retractable boom rope passing around the fixed pulley.

[0012] To achieve the linear displacement of the guide wheel frame with higher operating efficiency, further, the transmission mechanism includes:

[0013] A main gear, rotatably assembled with the fixed plate and assembled with the rocker;

[0014] A pair of gear rods, arranged in parallel and each provided with a driven gear, and the two driven gears are respectively meshed with the main gear for transmission; the pair of gear rods are respectively rotatably assembled with the fixed plate, pass through the guide wheel frame respectively, and are threadedly connected with the guide wheel frame.

[0015] In the above solution, the main gear is simultaneously meshed with the driven gears of the two gear rods. When the main gear rotates, it will drive the two gear rods to rotate simultaneously and ensure the consistency of the rotation direction; since both gear rods are threadedly connected to the vertical plate of the guide wheel frame, and the vertical plate of the guide wheel frame is rectangular and restricted by the boom cylinder, when the two gear rods rotate simultaneously, the guide wheel frame can only linearly displace along the axial direction of the gear rods to tighten the retracting arm rope. Using two gear rods can make the force on the guide wheel frame more uniform and the displacement more stable.

[0016] To enable the retracting arm rope to be locked after the tightness adjustment and improve the stability of the entire structure, further, the fixed plate is provided with a retaining bar, the retaining bar is threadedly connected to the fixed plate through bolts, and two teeth are provided at the bottom of the retaining bar, and the two teeth are respectively stuck in the tooth gaps of the two driven gears.

[0017] In the above solution, before adjusting the tightness of the retracting arm rope, it is necessary to unscrew the bolts and remove the retaining bar; after the tightness of the retracting arm rope is adjusted, the retaining bar is installed on the fixed plate, and the two protruding teeth on the retaining bar are respectively stuck in the tooth gaps of the two driven gears to prevent them from rotating or reversing when the tightness of the retracting arm rope does not need to be adjusted.

[0018] To save effort and improve efficiency when adjusting the tightness of the retracting arm rope, further, the number of teeth of the main gear is greater than that of the driven gear, and the gear transmission ratio is less than 1, which can improve the efficiency of the main gear driving the two gear rods to rotate.

[0019] To make the support and rotation of the gear rod more stable, further, the fixed plate is provided with guide sleeves that cooperate with the gear rods, and the two gear rods pass through the guide sleeves. The guide sleeves can well ensure the consistency of the force direction and prevent the force from being dispersed and causing the two gear rods to twist.

[0020] For more convenient adjustment, further, the rocker is designed to be detachable. A hexagonal groove is provided at the center of the main gear, and a hexagonal cylinder matching the hexagonal groove is provided at the end of the rocker. During adjustment, the rocker is inserted into the hexagonal groove of the main gear through the hexagonal cylinder, and the rocker is rotated to make the main gear rotate. After the adjustment is completed, the rocker can be directly removed. When adjusting the tightness of the retracting arm rope, the rocker extends out of the semi-closed opening of the boom cylinder body, providing a wider adjustment space and more convenient adjustment. The rocker is designed in a Z shape, increasing the force arm and also increasing the hand force application area, which is more convenient than adjusting with a wrench in the prior art.

[0021] The beneficial effects of the present utility model are as follows:

[0022] 1) The rocker can adjust the tightness of the retracting arm rope outside the arm body, solving the problem of inconvenient adjustment position of the retracting arm rope, and providing a wider and more comfortable adjustment space;

[0023] 2) The rocker is in a Z shape, increasing the rocker force arm, making it more labor-saving. The hand-held part of the rocker is provided with a handle ball head, increasing the hand force application area and making the operation more comfortable;

[0024] 3) Through gear meshing transmission, the problem of laborious adjustment of the retracting arm rope is solved, having a large transmission ratio range, being more labor-saving and having a higher adjustment efficiency;

[0025] 4) The fixing plate is arranged at a position close to the boom head of the boom cylinder body, solving the problem of small adjustment amount of the retracting arm rope and increasing the adjustable stroke of the retracting arm rope;

[0026] 5) Manual operation is more rapid and convenient, reducing the adjustment and maintenance costs. Description of the Drawings

[0027] Figure 1 It is a schematic structural diagram of the retracting arm rope tightness adjustment device of the truck-mounted crane of the present utility model;

[0028] Figure 2 It is a schematic connection diagram among the fixing plate, the guide sleeve and the gear rod of the present utility model;

[0029] Figure 3 It is a schematic connection diagram among the guide wheel frame, the fixed wheel and the retracting arm rope of the present utility model;

[0030] Figure 4 It is a schematic structural diagram of the stop bar of the present utility model;

[0031] Figure 5 It is a schematic structural diagram of the rocker of the present utility model;

[0032] Figure 6 It is a schematic structural diagram of the gear rod of the present utility model;

[0033] Figure 7Front schematic view of the main gear in the present utility model;

[0034] Figure 8 Back schematic view of the main gear in the present utility model;

[0035] In the figure: telescopic arm rope 1; fixed pulley 2; guide pulley frame 3, cross plate 3-1, vertical plate 3-2; gear rod 4, driven gear 4-1, threaded rod part 4-2, smooth rod part 4-3; stop bar 5, locking teeth 5-1; main gear 6, hexagonal groove 6-1, protruding shaft 6-2, annular groove 6-3; rocker 7, handle ball head 7-1, hexagonal cylinder 7-2; fixing plate 8; boom cylinder 9; guide sleeve 10; pin shaft 11; circlip 12. Specific embodiments

[0036] A telescopic arm rope tension adjustment device for a truck-mounted crane, as Figure 1 shown, includes: telescopic arm rope 1, fixed pulley 2, guide pulley frame 3, a pair of parallel gear rods 4 (driven gears 4-1 are provided on the gear rods), stop bar 5, main gear 6, rocker 7, fixing plate 8, boom cylinder 9.

[0037] When the telescopic arm rope 1 is installed, it winds around the fixed pulley 2. The fixed pulley 2 is fixedly installed on the guide pulley frame 3. The fixing plate 8 is welded at a position close to the boom head of the boom cylinder 9; the main gear 6 is rotatably assembled with the fixing plate 8. A pair of gear rods 4 are respectively rotatably assembled with the fixing plate and are respectively threadedly connected to the guide pulley frame. Two driven gears 4-1 are respectively meshed and driven with the main gear, ensuring that when the main gear rotates, it drives the two gear rods to rotate in the same direction; the rocker 7 extends out of the semi-closed opening of the boom cylinder and cooperates with the main gear 6. By rotating the rocker, through gear meshing transmission and threaded transmission, the guide pulley frame is driven to linearly displace, realizing the tensioning of the telescopic arm rope.

[0038] As Figure 4 shown, the stop bar 5 is threadedly connected to the fixing plate through two bolts, and two locking teeth 5-1 are provided at the bottom of the stop bar. The two locking teeth are respectively stuck in the tooth gaps of the two driven gears, realizing the locking of the adjustment device.

[0039] In an embodiment of the present utility model, the number of teeth of the main gear is greater than the number of teeth of the driven gear, and the gear transmission ratio is less than 1, improving the efficiency of the main gear driving the two gear rods to rotate.

[0040] In an embodiment of the present utility model, as Figure 2 shown, a guide sleeve 10 cooperating with the gear rod is welded on the fixing plate 8. The two gear rods pass through the guide sleeve, and the guide sleeve can well ensure the consistency of the force direction and prevent the force from being dispersed and causing the two gear rods to twist.

[0041] In an embodiment of the present utility model, as Figure 5As shown, the rocker is Z-shaped to increase the force arm. The hand-held part of the rocker is provided with a handle ball head 7-1, which increases the hand force application area.

[0042] In an embodiment of the present utility model, the rocker is designed to be separable. A hexagonal groove 6-1 is provided at the center of the main gear, and a hexagonal cylinder 7-2 matching the hexagonal groove is provided at the end of the rocker. The rocker drives the main gear by inserting the hexagonal cylinder into the hexagonal groove of the main gear.

[0043] In an embodiment of the present utility model, as Figure 3 shown, the guide wheel frame 3 includes two parallel horizontal plates 3-1 and a vertical plate 3-2. The fixed wheel 2 is installed between the two horizontal plates of the guide wheel frame 3 through a stepped pin 11, and the other end of the pin 11 is limited by a circlip.

[0044] In an embodiment of the present utility model, as Figure 6 shown, the gear rod 4 further includes a threaded rod part 4-2 and a smooth rod part 4-3. The driven gear 4-1 is located at the end of the gear rod. Two gear rods pass through the light holes on the fixed plate and the light holes on the guide sleeve (the smooth rod parts are in clearance fit with the corresponding light holes to achieve rotation), and the threaded rod part is connected and matched with the threaded holes on the guide wheel frame.

[0045] In an embodiment of the present utility model, as Figures 7-8 shown, a hexagonal groove 6-1 is provided at the center of the front surface of the main gear 6, and a protruding shaft 6-2 is provided at the center of the back surface. An annular groove 6-3 is provided on the protruding shaft. The protruding shaft of the main gear is in clearance fit with the corresponding light hole on the fixed plate to achieve rotational fit. A circlip 12 is arranged in the annular groove to fix the main gear on the fixed plate.

Claims

1. A telescopic boom rope tightness adjusting device for a truck-mounted crane, characterized in that, Including: A fixed pulley around which the boom retraction rope is wound; A guide pulley frame on which the fixed pulley is fixedly mounted; A fixed plate fixedly mounted on the boom cylinder of the crane; A transmission mechanism connecting the fixed plate and the guide pulley frame; A rocker arm that drives the transmission mechanism through the rocker arm to drive the displacement of the guide pulley frame to achieve the tensioning of the boom retraction rope.

2. The telescopic boom rope tightness adjusting device for a truck-mounted crane according to claim 1, wherein The transmission mechanism includes: A main gear rotatably assembled with the fixed plate and assembled with the rocker arm; A pair of gear rods arranged in parallel and each provided with a driven gear, and the two driven gears are respectively meshed and driven with the main gear; the pair of gear rods are respectively rotatably assembled with the fixed plate, pass through the guide pulley frame respectively, and are threadedly connected with the guide pulley frame.

3. The telescopic boom rope tension adjustment device for a truck-mounted crane according to claim 2, wherein A stop bar is further provided; the stop bar is threadedly connected with the fixed plate through a bolt, and two locking teeth are provided at the bottom of the stop bar, and the two locking teeth are respectively stuck in the tooth gaps of the two driven gears.

4. An outrigger crane telescopic boom rope tightness adjusting device according to claim 2 or 3, characterized in that, The number of teeth of the main gear is greater than the number of teeth of the driven gear.

5. The telescopic boom rope tightness adjusting device for a truck-mounted crane according to claim 2, characterized in that, A guide sleeve cooperating with the gear rod is provided on the fixed plate.

6. The telescopic boom rope tightness adjusting device for a truck-mounted crane according to claim 2, wherein A hexagonal groove is provided at the center of the main gear, and a hexagonal cylinder matching the hexagonal groove is provided at the end of the rocker arm.

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