Crane girder hoisting clamp

Abstract

The utility model provides a crane girder hoisting clamp, which relates to the technical field of crane manufacturing and comprises a base, a screw rod rotationally connected onto the base and small arms symmetrically distributed about the screw rod, large arms rotationally connected onto the small arms and symmetrically distributed, and a driving box fixedly arranged on the base and guide rods symmetrically distributed about the screw rod. A driving assembly is arranged in the driving box and connected with a lead screw. According to the device, lifting lugs do not need to be welded to the main beam and then matched with a crane for transferring, stable clamping of the main beam can be achieved only by matching the corresponding number of lifting beams and lifting clamps according to the length of the main beam, the driving assembly drives the lead screws to rotate, finally, opening and closing movement of the two large arms can be achieved, and then clamping and fixing of the main beam are achieved; and the use effect is good, the problem of mutual interference between the main beam and related parts of the crane travelling trolley is avoided, the hoisting process operation is simple, hoisting belts of different specifications do not need to be frequently replaced, and the hoisting efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of crane manufacturing, in particular to a crane main beam hoisting fixture. Background Art

[0002] The main beam of a crane is generally a rectangular beam structure with upper and lower flanges. Depending on the actual usage scenario, its length ranges from 10 to 40 meters. The traditional manufacturing process is to weld two lifting ears on both sides of the main beam, and hang the main beam on the hook through a shackle and a lifting belt (or wire rope).

[0003] The use of lifting ears for lifting has high requirements on the welding of the lifting ears. Once the welding quality does not meet the standards, the lifting ears are prone to tearing. In addition, different specifications of lifting belts should be used for lifting according to the different widths of the main beams. During lifting, the processes of threading and removing the ropes need to be carried out in sequence, which is more troublesome. Moreover, these lifting ears used for lifting will remain on the main beam of the crane, which may easily cause mutual interference between the main beam and the related parts of the crane trolley. Utility Model Content

[0004] The purpose of the utility model is to solve the problems raised in the above background technology, and then propose a crane main beam hoisting fixture.

[0005] The technical solution adopted by the utility model to solve its technical problems is:

[0006] A crane main beam lifting fixture comprises a base, a screw rod and a small arm and two linkage rods symmetrically distributed about the screw rod are rotatably connected to the base, a symmetrically distributed large arm is rotatably connected to the small arm, one end of the two linkage rods are rotatably connected to the two large arms respectively, a driving box and guide rods symmetrically distributed about the screw rod are fixed on the base, a driving assembly is arranged in the driving box and the driving assembly is connected to the screw rod, a slider slidably matched with the guide rod is threadedly connected to the screw rod, and the two ends of the slider are rotatably connected to the two small arms respectively through two connecting rods.

[0007] This device does not need to weld lifting ears on the main beam and then cooperate with the crane for transfer. It only needs to match the corresponding number of lifting beams and lifting fixtures according to the length of the main beam to achieve stable clamping of the main beam. The drive assembly drives the screw to rotate to eventually realize the opening and closing movement of the two large arms, thereby achieving the clamping and fixation of the main beam. The use effect is good, and will not cause mutual interference between the main beam and the relevant parts of the crane trolley. In addition, the lifting process is simple to operate and does not require frequent replacement of lifting belts of different specifications, thereby improving the lifting efficiency.

[0008] Furthermore, the driving assembly includes a worm, a worm wheel, a rotating shaft, a turntable and a crank. The rotating shaft and the worm are rotatably connected in the driving box. The rotating shaft is provided with a worm wheel that matches the worm. One end of the worm passes through the driving box and is connected to a lead screw. One end of the rotating shaft passes through the driving box and is connected to a turntable. The turntable is provided with a crank.

[0009] The above solution uses a manual method to complete the clamping and fixing of the main beam.

[0010] Furthermore, the driving assembly includes a servo motor, a main gear, a rotating roller and a sub-gear. The driving box is provided with a servo motor and a rotating roller that is rotatably connected. The servo motor is connected to the main gear. The main gear is meshed with the sub-gear arranged on the rotating roller. One end of the rotating roller passes through the driving box and is connected to a screw rod.

[0011] The above scheme uses an automatic method to complete the clamping and fixing of the main beam, thereby reducing the labor intensity of manual operation.

[0012] Furthermore, a limit block is arranged on the screw rod.

[0013] The above solution can limit the movement range of the slider during the lifting process by means of the limit block.

[0014] Furthermore, a rubber layer is provided on the upper arm.

[0015] The above scheme reduces the wear on the main beam surface during the clamping and fixing process of the lifting fixture through the rubber layer.

[0016] Furthermore, the driving box is provided with a transparent protective shell which is arranged on the outside of the turntable and can accommodate the crank handle.

[0017] The above solution can avoid the problem of change in clamping force caused by other objects accidentally hitting the crank handle during lifting and transportation through the transparent protective shell, thereby improving safety.

[0018] Compared with the prior art, the beneficial effects of the utility model are:

[0019] Compared with the existing technology, the present device does not need to weld lifting ears on the main beam and then cooperate with the crane for transfer. It only needs to match the corresponding number of lifting beams and lifting fixtures according to the length of the main beam to achieve stable clamping of the main beam. The drive assembly drives the screw to rotate, and finally the opening and closing movement of the two large arms can be realized, thereby achieving the clamping and fixation of the main beam. The use effect is good, and will not cause mutual interference between the main beam and the related parts of the crane running trolley. In addition, the lifting process is simple to operate and does not require frequent replacement of lifting belts of different specifications, thereby improving the lifting efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0021] Figure 2 is a cross-sectional view of the interior of the device;

[0022] Figure 3 It is a schematic diagram of a first embodiment of a driving assembly;

[0023] Figure 4 is a schematic diagram of a second embodiment of a driving assembly;

[0024] Reference numerals:

[0025] 1. Base; 2. Small arm; 3. Large arm; 4. Screw rod; 5. Slider; 6. Guide rod; 7. Connecting rod; 71. Linkage rod; 8. Drive box; 801. Worm; 802. Worm wheel; 803. Rotating shaft; 804. Turntable; 805. Crank handle; 901. Servo motor; 902. Main gear; 903. Rotating roller; 904. Sub gear. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model. The utility model is further described in combination with the drawings and embodiments:

[0027] like Figures 1 to 4 As shown, a crane main beam lifting fixture includes a base 1, on which a screw rod 4 and a small arm 2 and two linkage rods 71 ​​symmetrically distributed about the screw rod 4 are rotatably connected, on which the small arm 2 is rotatably connected, and one end of the two linkage rods 71 ​​is rotatably connected to the two large arms 3, respectively. A driving box 8 and a guide rod 6 symmetrically distributed about the screw rod 4 are fixed on the base 1, a driving assembly is arranged in the driving box 8 and the driving assembly is connected to the screw rod 4, a slider 5 slidably matched with the guide rod 6 is threadedly connected to the screw rod 4, and both ends of the slider 5 are rotatably connected to the two small arms 2 through two connecting rods 7.

[0028] The first embodiment of the driving assembly:

[0029] The specific implementation of the first embodiment of the utility model is as follows Figure 1 and Figure 3As shown, the driving assembly includes a worm 801, a worm wheel 802, a rotating shaft 803, a turntable 804 and a crank 805. The rotating shaft 803 and the worm 801 are rotatably connected in the driving box 8. The rotating shaft 803 is provided with a worm wheel 802 that matches the worm 801. One end of the worm 801 passes through the driving box 8 and is connected to the screw 4. One end of the rotating shaft 803 passes through the driving box 8 and is connected to the turntable 804. The turntable 804 is provided with a crank 805. The first embodiment adopts a manual method to complete the clamping and fixing of the main beam.

[0030] The second embodiment of the driving assembly:

[0031] The specific implementation of the second embodiment of the utility model is as follows Figure 4 As shown, the driving assembly includes a servo motor 901, a main gear 902, a rotating roller 903 and a sub-gear 904. The servo motor 901 and the rotating roller 903 are rotatably connected in the driving box 8. The servo motor 901 is connected to the main gear 902. The main gear 902 is meshed with the sub-gear 904 arranged on the rotating roller 903. One end of the rotating roller 903 passes through the driving box 8 and is connected to the screw rod 4. The servo motor 901 is electrically connected to the controller, which is not shown in the figure. The second embodiment adopts an automatic method to complete the clamping and fixing of the main beam, which can reduce the labor intensity of manual operation.

[0032] The workflow of this utility model:

[0033] First, the main beam is placed on a number of small supports, which are set on the ground and are not shown in the figure. Then, the overhead crane on the lifting equipment drives the device to move downward close to the main beam. Specifically, the length of the main beam to be hoisted and transferred is matched with the number of slings and beams to ensure the stability of the main beam during the hoisting process. At this time, the screw rod 4 is driven to rotate by the driving assembly. The screw rod 4 rotates and cooperates with the guide rod 6 to make the slider 5 move up and down along the screw rod 4;

[0034] When the slider 5 moves upward, the connecting rod 7 moves to make the small arm 2 rise, and then the big arm 3 clamps the main beam, and then the lifting and hoisting transfer process of the main beam can be carried out. When the main beam reaches the lifting and transfer area, the driving assembly drives the lead screw to rotate in the opposite direction, and then the slider 5 moves downward. At this time, the connecting rod 7 drives the small arm 2 to descend, and then the big arm 3 releases the firm clamping of the main beam. At this time, the main beam is removed and the next round of lifting and hoisting process can be carried out.

[0035] It should be noted that the lifting beam installed on the spreader can be directly connected to the wire rope wound on the crane trolley drum (that is, in one case, the wire rope does not have a hook, and the lifting beam is directly fixed to the wire rope, and the spreader is equivalent to a hook, and itself is a spreader, which is specially used to lift the main beam of the crane). In another case, it can also be hung on the hook at one end of the wire rope and then act as a hook to realize the lifting and transfer of the main beam.

[0036] Compared with the prior art, the device does not need to weld lifting ears on the main beam and then transfer it with a crane. It only needs to match the corresponding number of lifting beams and lifting fixtures according to the length of the main beam to achieve stable clamping of the main beam. Specifically, when lifting the main beam, two lifting fixtures are added to the top of a lifting beam. The lifting fixture is connected to the lifting beam through a hook or directly using a wire rope, and the lifting beam can be directly connected to the hook of the overhead crane. The two lifting fixtures clamp the two ends of the main beam to complete the lifting;

[0037] For longer main beams, two lifting beams with four lifting fixtures can be used for lifting to improve the lifting stability of large-sized main beams;

[0038] By driving the screw rod to rotate through the driving assembly, the opening and closing movement of the two large arms can be realized, thereby achieving the clamping and fixation of the main beam. The use effect is good, and no mutual interference problems will be caused between the main beam and the crane trolley related parts. The hoisting process is simple to operate and does not require frequent replacement of hoisting belts of different specifications, thereby improving the hoisting efficiency.

[0039] In some embodiments, a limit block is provided on the screw rod 4 , which is not shown in the figure; the limit block can limit the movement range of the slider 5 during the lifting process of the screw rod 4 .

[0040] In other embodiments, a rubber layer is provided on the upper arm 3 to reduce the wear on the surface of the main beam during the clamping and fixing process, and the rubber layer is not shown in the figure.

[0041] In other embodiments, the drive box 8 is provided with a transparent protective shell that covers the outside of the turntable 804 and can accommodate the crank handle 805. The transparent protective shell is not shown in the figure. This embodiment can avoid the problem of changes in clamping force caused by other objects accidentally touching the crank handle 805 during lifting and transportation through the transparent protective shell, thereby improving safety.

[0042] The above shows and describes the basic principles, main features and advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments. The above embodiments and descriptions in the specification are only to illustrate the principles of the utility model. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, which fall within the scope of the protection required by the utility model. The scope of protection required by the utility model is defined by the attached claims and their equivalents.

Claims

1. A crane main beam lifting fixture, characterized in that: The invention comprises a base (1), a screw rod (4) and a small arm (2) and two linkage rods (71) rotatably connected to the base (1), a large arm (3) symmetrically distributed on the small arm (2), one end of the two linkage rods (71) are rotatably connected to the two large arms (3), a driving box (8) and a guide rod (6) symmetrically distributed on the screw rod (4) are fixedly arranged on the base (1), a driving assembly is arranged in the driving box (8) and the driving assembly is connected to the screw rod (4), a slider (5) slidably matched with the guide rod (6) is threadedly connected to the screw rod (4), and the two ends of the slider (5) are rotatably connected to the two small arms (2) through two connection rods (7).

2. A crane main beam lifting fixture according to claim 1, characterized in that: The driving assembly comprises a worm (801), a worm wheel (802), a rotating shaft (803), a rotating disk (804) and a crank (805); the rotating shaft (803) and the worm (801) are rotatably connected in a driving box (8); the rotating shaft (803) is provided with a worm wheel (802) matched with the worm (801); one end of the worm (801) passes through the driving box (8) and is connected to a lead screw (4); one end of the rotating shaft (803) passes through the driving box (8) and is connected to a rotating disk (804); and the rotating disk (804) is provided with a crank (805).

3. The crane main beam lifting fixture according to claim 1, characterized in that: The driving assembly comprises a servo motor (901), a main gear (902), a rotating roller (903) and a sub-gear (904); a driving box (8) is provided with the servo motor (901) and is rotatably connected to the rotating roller (903); the servo motor (901) is connected to the main gear (902); the main gear (902) is meshed with the sub-gear (904) provided on the rotating roller (903); one end of the rotating roller (903) passes through the driving box (8) and is connected to a lead screw (4).

4. The crane main beam lifting fixture according to claim 1, characterized in that: A limit block is arranged on the screw rod (4).

5. The crane main beam hoisting fixture according to claim 1, characterized in that: A rubber layer is provided on the upper arm (3).

6. The crane main beam lifting fixture according to claim 2, characterized in that: The driving box (8) is provided with a transparent protective shell which is arranged on the outside of the rotating disk (804) and can accommodate the crank handle (805).

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