Front anti-back-inclination structure of tower arm of crawler crane

Abstract

The utility model discloses a front anti-back-tilting structure of a tower arm of a crawler crane, one end of the front anti-back-tilting structure of the tower arm is rotatably connected to the bottom of a bottom section arm of the tower arm, the other end of the front anti-back-tilting structure of the tower arm slides on a slide way on a top section arm of a main arm through a slide block, and a support plate for limiting the slide block is arranged at the end part of the slide way. The sliding block slides towards the supporting plate along with rising of the tower arm bottom section arm till the sliding block makes contact with the supporting plate, and therefore the rotation angle of the tower arm bottom section arm is limited. The left-right integrated anti-back-tipping device is hinged by two coaxial pin shafts which are far away from each other, is used for solving the problem that the anti-back-tipping free end is large in swing amplitude in the working process of a crane, and is beneficial to anti-back-tipping stable rail injection. In addition, the anti-backward-inclination sliding block and the sliding way are in large-plane contact, the contact area is large, the error-tolerant rate is high, and the anti-backward-inclination reliability is improved. The anti-back-tipping main body structure is formed by splicing and welding the sectional materials, the sectional materials can be round pipes, rectangular pipes and the like, the cost is low, the anti-back-tipping structure is suitable for medium-tonnage products according to practice, and the back-tipping angle of the cantilever crane is controlled within 5 degrees.

Description

Technical Field

[0001] The utility model belongs to the field of crawler cranes, in particular to a crawler crane tower arm forward and backward tilting prevention structure. Background Art

[0002] Crawler cranes are mobile cranes that install the lifting part on a crawler chassis and travel on crawler devices. Crawler cranes have the advantages of strong lifting capacity, small ground pressure, small turning radius, and the ability to travel with loads. They are widely used in various fields such as petrochemicals, highways and railways, subways, electricity, bridges, municipal administration, and wind power hoisting.

[0003] The requirements for crawler cranes in the prior art include that cranes using wire rope luffing should be equipped with a device to prevent the boom, superlift mast, and jib mast from tipping backwards. The device can absorb the impact caused by the sudden release of the load due to a failure of the wire rope or the sling, and prevent the boom or mast from tipping backwards. Under the tower condition, the anti-tilt device of the tower arm is generally divided into the front anti-tilt device of the tower arm and the rear anti-tilt device of the tower arm. The front anti-tilt device of the tower arm is generally supported between the bottom arm of the tower arm and the top arm of the main arm, and is used to limit the backward tipping of the tower arm. The rear anti-tilt device of the tower arm is generally supported between the top arm of the main arm and the rear bracket of the tower arm, and is used to limit the backward tipping of the rear bracket of the tower arm. There is also a rear anti-tilt device of the tower arm installed between the top arm of the main arm and the front bracket of the tower arm, and is used to limit the backward tipping of the front bracket of the tower arm.

[0004] In the prior art, crawler crane tower arm front anti-tilt devices usually use weight hammer type, limit rope type, oil cylinder type, etc.; the weight hammer type anti-tilt structure is generally plagued by problems such as large swing of the free end of the anti-tilt device, difficulty in entering the track, long debugging cycle, and high requirements for processing and assembly precision. The limit rope type anti-tilt device uses a cable to connect the top arm of the main arm and the lower side of the bottom arm of the tower arm. Due to the fact that the angle of the main tower arm during the arm connection process is about 180°, the arm's backward flip angle will also be large. The oil cylinder type anti-tilt device has a high cost and is generally used for large tonnage and super-large tonnage products with high added value. Utility Model Content

[0005] Purpose of the utility model: The utility model aims to provide a crawler crane tower arm forward anti-backward tilting structure with high reliability and good safety.

[0006] Technical solution: The crawler crane tower arm front anti-tilt structure described in the utility model has one end of the tower arm front anti-tilt structure rotatably connected to the bottom of the tower arm bottom section arm, and the other end slides on the slideway on the main arm top section arm through a slider, and a support plate for limiting the slider is provided at the end of the slideway. As the tower arm bottom section arm rises, the slider slides toward the support plate until the two are in contact to limit the rotation angle of the tower arm bottom section arm.

[0007] The tower arm front anti-tilt structure includes a main structural member, a chain and a pin shaft. The bottom end of the main structural member is in sliding contact with the slideway through a slider, and the top end is rotationally connected to the tower arm bottom section arm through a pin shaft.

[0008] Among them, the main structural parts include sliders, sealing plates, main limbs, connecting rods, beams I, II, III, counterweights, rib plates I, II, limit plates, lifting ears, hanging points A and hinge points A; a slider is provided at one end of the main limb, and a hinge point A is provided at the other end, and hinge point A is connected to the ear plate on the bottom section arm of the tower arm through a pin; the connecting rod is connected to the main limb, and a counterweight is provided at the end of the connecting rod for changing the center of gravity position of the main structural parts.

[0009] Among them, crossbeam III, crossbeam II and crossbeam I are arranged between the main limb and the connecting rod in sequence, rib plate I is arranged between the main limb and crossbeam II, and rib plate II is arranged between the connecting rod and the counterweight block.

[0010] Wherein, the hanging point A on the cross beam I is connected with the hanging point B on the bottom section of the tower arm through a chain.

[0011] Among them, the main limb, connecting rod, beam I, beam II, and beam III are all round tubes.

[0012] Wherein, a rib plate II is provided between the connecting rod and the counterweight block.

[0013] Beneficial effects: Compared with the prior art, the utility model has the following advantages: The left and right integrated anti-tilt device provided by the utility model is hinged by two coaxial pins that are far apart, which is used to solve the problem of large swing amplitude of the free end of the anti-tilt device during the operation of the crane, and is conducive to the stable entry of the anti-tilt device into the track. In addition, the anti-tilt slider in the utility model is in contact with the slideway on a large plane, with a large contact area, high fault tolerance, and improved anti-tilt reliability. The anti-tilt main structure is made of profiles welded together, and the profiles can be round tubes, rectangular tubes, etc., with low cost. According to practice, the anti-tilt structure is more suitable for medium-tonnage products, and the boom backward tilt angle is controlled within 5°. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a schematic diagram of the working state of the tower arm forward anti-backward tilting structure of the utility model;

[0015] Figure 2 This is an axial side view of the tower arm front anti-backward tilt structure of the utility model in working state;

[0016] Figure 3 This is a schematic diagram of the tower arm forward anti-backward tilt structure of the utility model;

[0017] Figure 4 It is a schematic diagram of the main structural parts of the utility model;

[0018] Figure 5This is a schematic diagram of the structure of the anti-backward tilting slideway of the tower arm of the utility model;

[0019] Figure 6 This is a schematic diagram of the welding parts of the tower arm front anti-backward tilt structure of the utility model;

[0020] Figure 7 This is an enlarged view of the welding parts of the front anti-tilt structure of the tower arm of the utility model;

[0021] Figure 8 This is a schematic diagram of the working state of the anti-tilt limit surface of the utility model;

[0022] Fig. 9 This is an enlarged view of the working state of the anti-tilt limit surface of the utility model;

[0023] Fig.10 This is a schematic diagram of the installation state of the tower arm forward anti-backward tilting of the utility model;

[0024] Fig.11 This is an enlarged view of the installation state of the front anti-tilt tower arm of the utility model;

[0025] Fig.12 This is a schematic diagram of the tower arm of the utility model in the state of preventing the tower arm from tilting backwards;

[0026] Fig.13 It is a partial schematic diagram of the tower arm of the utility model in the state of anti-tilting backwards and flipping forward;

[0027] Fig.14 This is a schematic diagram of the tower arm front anti-backward tilting structure of the utility model in a deadlocked state;

[0028] Fig.15 It is a partial enlarged view of the deadlock state of the front anti-backward tilting structure of the tower arm of the utility model;

[0029] Fig.16 It is a schematic diagram of the tower arm's forward anti-backward tilting flipping state during the arm dropping process of the utility model;

[0030] Fig.17 It is an enlarged view of the tower arm of the utility model in the state of preventing the backward tilt from turning over. DETAILED DESCRIPTION

[0031] The utility model relates to a crawler crane tower arm forward backward tilting prevention structure, such as Figures 1-2 As shown, the tower arm front anti-tilt structure 1 is used for the tower arm working condition of the crawler crane, which is installed on the tower arm bottom section arm 2, and the slideway 5 is located on the main arm top section arm 6. As the tower arm flips backward, the anti-tilt slider 1101 moves backward along the slideway 5 on the main arm top section arm until the slider 1101 moves to the support plate 7 at the arc at the rear end of the slideway. The movement of the slider 1101 is restricted, the tower arm cannot continue to flip backward, and the anti-tilt function takes effect.

[0032] like Figure 3As shown, the tower arm front anti-backward tilt structure 1 includes a main structure 11, a chain 13 and a pin 12, wherein the chain 13 is used for limiting. Figures 10-11 As shown in the figure, the anti-tilt center of gravity of the tower arm in the state of boom installation must be located on the right side of the flip hinge A, ensuring that the anti-tilt falls to the bottom arm of the tower arm under the action of gravity. The specific position of its center of gravity on the right side needs to be limited according to the set anti-tilt flip angle, such as the anti-tilt flip when the tower arm is raised to the angle of 40° between the tower arm and the horizontal plane.

[0033] like Figure 4 As shown, the main structure 11 includes a slider 1101, a sealing plate 1102, a main limb 1103, a connecting rod 1111, a beam I 1113, a beam II 1106, a beam III 1104, a counterweight 1114, a rib plate I 1105, a rib plate II 1112, a limit plate 1108, a lifting lug 1110, a hanging point A 1109, a hinge point A 1107 and a limit plate 1115; Figure 7 As shown, a hanging point B21 is provided on the tower arm bottom section arm 2, and the hanging point B21 is connected to the hanging point A1109 by a chain 13; an ear plate 23 is also provided on the tower arm bottom section arm 2, and the ear plate 23 is connected to the hinge point A1107 at the end of the main limb 1103 by a pin 12, a slider 1101 is provided at the other end of the main limb 1103, and sealing plates 1112 are provided on both sides of the slider 1101, and a crossbeam III 1104, a crossbeam II 1106 and a crossbeam I 1113 are provided between the two main limbs 1103 and the two connecting rods 1111 in sequence, a rib plate I 1105 is provided between the main limb 1103 and the crossbeam II 1106, and a rib plate II 1112 is provided between the connecting rod 1111 and the counterweight block 1114.

[0034] like Figure 5 As shown, the main arm top section 6 is provided with a slideway adapted to the slider 1101 of the tower arm front anti-tilt structure, and the left and right sides are stacked and arranged, including a support plate 7 and a flat slideway 5. The flat slideway 5 cooperates with the slider 1101 to slide along with the rotation of the tower arm bottom section 2, and the support plate 7 is used to limit the further sliding of the slider 1101 at a specified position. The tower arm front anti-tilt structure 1 welded parts on the tower arm bottom section 2 are as shown in FIG. Figure 6 As shown, local details are as follows Figure 7 As shown, two groups of ear plates 23 are symmetrically welded, and the hanging point B21 is welded in the middle. The circular hole on the ear plate is used to be hinged with the hinge point A1109 on the anti-tilt through the pin 1112. The anti-tilt can rotate around the pin 1112. The upper side of the ear plate 23 is designed with a limited position surface 22, which is connected to the Figure 4 The limiting plate 1115 in the main structural member schematic diagram is used to limit the anti-tilt range of movement to prevent the anti-tilt from damaging the structural parts on the bottom section of the tower arm. Figure 8 shown.

[0035] When the tower arm is raised to the designed angle, the tower arm will tilt forward and backward. Fig.12 As shown, the local enlarged picture is as follows Fig.13 As shown in the figure, the anti-tilt chain will pull the anti-tilt during the flipping process, limiting the upper slider end from hitting the flat slideway on the top section of the main boom. During the tower boom lowering process, the front anti-tilt of the tower boom decreases with the angle between the tower boom and the horizontal plane, and the loose chain on the anti-tilt is straightened, and then the anti-tilt slider is lifted to leave the slideway on the top section of the main boom, until the center of gravity of the anti-tilt is transferred to the right side of the vertical plane of the hinge point, and the anti-tilt flips to the bottom section of the tower boom, and the anti-tilt limit plate is against the upper limit surface of the ear plate of the bottom section of the tower boom.

[0036] The tower arm front anti-tilt structure 1 in the utility model adopts a left-right integrated structure, with two main limbs 1103 spliced ​​by a crossbeam, and hinged to the tower arm bottom section arm 2 by two coaxial pins 1109 that are far apart, limiting the shaking of the anti-tilt free end and increasing the reliability of the anti-tilt rail entry; during the arm raising process, after the tower arm front anti-tilt structure 1 is flipped over from the tower arm bottom section arm 2, the tower arm front anti-tilt structure 1 is pulled by the chain 13 to prevent the tower arm front anti-tilt structure 1 from directly falling onto the slideway 5, causing damage to the structural parts. Figures 14 to 17 As shown, during the arm lowering process, the anti-tilt chain 13 changes from loose to tight, and then pulls up the slider 1101 of the tower arm front anti-tilt structure 1 to separate from the slideway 5 on the main arm top section arm 6, until the anti-tilt center of gravity is transferred to the right side of the vertical plane of the hinge point, and the anti-tilt is flipped to the tower arm bottom section arm 2, and the anti-tilt limit plate 1115 abuts against the upper limit surface 23 of the tower arm bottom section arm ear plate 22. The tower arm front anti-tilt structure 1 in the boom installation state (as shown in FIG. Fig.10 and Fig.11 The center of gravity of the anti-tilt bracket (as shown in the figure) needs to be located on the right side of the flip hinge A1109 to ensure that the anti-tilt bracket falls onto the tower arm bottom section 2 under the action of gravity. The specific position of the center of gravity on the right side needs to be limited according to the set anti-tilt flip angle.

Claims

1. A crawler crane tower arm forward anti-tilt structure, It is characterized in that One end of the tower arm forward anti-backward tilt structure (1) is rotatably connected to the bottom of the tower arm bottom section arm (2), and the other end slides on a slideway (5) on the main arm top section arm (6) through a slider (1101), and a support plate (7) for limiting the slider (1101) is provided at the end of the slideway (5). As the tower arm bottom section arm (2) rises, the slider (1101) slides toward the support plate (7) until the two contact each other, thereby limiting the rotation angle of the tower arm bottom section arm (2).

2. The crawler crane tower arm forward anti-backward tilt structure according to claim 1, It is characterized in that The tower arm front anti-backward tilt structure (1) comprises a main structural member (11), a chain (13) and a pin shaft (12); the bottom end of the main structural member (11) is in sliding contact with a slideway (5) via a slider (1101), and the top end is rotationally connected to the tower arm bottom section arm (2) via the pin shaft (12).

3. The crawler crane tower arm forward anti-backward tilt structure according to claim 2, It is characterized in that The main structural member (11) comprises a sliding block (1101), a sealing plate (1102), a main limb (1103), a connecting rod (1111), a cross beam I (1113), a cross beam II (1106), a cross beam III (1104), a counterweight (1114), a rib plate I (1105), a rib plate II (1112), a limit plate (1108), a lifting lug (1110), a hanging point A (1109), and a hinge point A ( 1107); a slider (1101) is provided at one end of the main limb (1103), and a hinge point A (1107) is provided at the other end, and the hinge point A (1107) is connected to the ear plate (23) on the tower arm bottom section arm (2) through a pin shaft (12); a connecting rod (1111) is connected to the main limb (1103), and a counterweight block (1114) is provided at the end of the connecting rod (1111) for changing the center of gravity position of the main structure (11).

4. The crawler crane tower arm forward anti-backward tilt structure according to claim 3, It is characterized in that A crossbeam III (1104), a crossbeam II (1106) and a crossbeam I (1113) are arranged in sequence between the main limb (1103) and the connecting rod (1111); a rib plate I (1105) is arranged between the main limb (1103) and the crossbeam II (1106); and a rib plate II (1112) is arranged between the connecting rod (1111) and the counterweight block (1114).

5. The crawler crane tower arm forward anti-backward tilt structure according to claim 3, It is characterized in that The hanging point A (1109) on the cross beam I (1113) is connected to the hanging point B (21) on the tower arm bottom section arm (2) via a chain (13).

6. The crawler crane tower arm forward anti-backward tilt structure according to claim 3, It is characterized in that The main limb (1103), connecting rod (1111), crossbeam I (1113), crossbeam II (1106), and crossbeam III (1104) are all round tubes.

7. The crawler crane tower arm forward anti-backward tilt structure according to claim 3, It is characterized in that A rib plate II (1112) is provided between the connecting rod (1111) and the counterweight block (1114).

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