Cantilever crane with stable supporting structure

Abstract

The utility model relates to the technical field of hoisting machinery, in particular to a boom with a stable supporting structure, which comprises a main boom, a cable-stayed supporting frame and a supporting table, the cable-stayed supporting frame is rotatably connected with the supporting table, a first telescopic cylinder is arranged at the lower end of the cable-stayed supporting frame, and the output end of the first telescopic cylinder is fixedly connected with a supporting plate. One end of the steel wire rope is connected with the free end of the arm section, and the other end of the steel wire rope is connected to the winding drum after passing through the first pulley box and the second pulley box; in the lifting process, one part of pulling force borne by the arm section can be transmitted to the cable-stayed supporting frame and the winding drum through the steel wire rope, and the lifting capacity of the arm support is improved; after the work is finished, the cable-stayed supporting frame can be horizontally placed by adjusting the first telescopic air cylinder, the second telescopic air cylinder and the supporting plate, and the cable-stayed supporting device is convenient to transfer.

Description

Technical Field

[0001] This utility model relates to the field of lifting machinery technology, specifically to a boom with a stable support structure. Background Technology

[0002] The boom is an important component of a crane, including truck cranes. The application of telescopic booms makes truck cranes more efficient and convenient to use. The boom has a box-shaped structure, including a base boom that is rotatably connected to a support platform. The base boom is nested with boom sections, and so on, with each boom section being nested in turn. The extension and retraction of each boom section is achieved through hydraulic cylinders and cable trays, which greatly increases the working range of the crane and makes the crane easier to move.

[0003] However, the nesting of the base boom and boom sections, as well as the nesting between boom sections, causes the cross-section of the boom section to gradually decrease. At the same time, the overlapping between the base boom and boom sections, and between boom sections, causes the lifting capacity of existing cranes to decrease significantly with the increase of boom sections, and the load-bearing capacity at the connection between the base boom and boom sections and between boom sections is relatively weak. Utility Model Content

[0004] The purpose of this invention is to provide a boom with a foldable inclined support frame to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a boom with a stable support structure, comprising a main boom, a boom lifting hydraulic cylinder, and a support platform. The main boom includes a base boom and a telescopic joint, and also includes a diagonal support frame. A first pulley box is installed on the top of the diagonal support frame, and the diagonal support frame is installed on the top surface of the support platform. A second pulley box is also installed on the top surface of the support platform. The free end of the telescopic joint is connected to a wire rope, and a pressure sensor is provided at the connection between the wire rope and the telescopic joint. The other end of the wire rope is connected to a drum through the first pulley box and the second pulley box.

[0006] Preferably, the inclined support frame is rotatably connected to the support platform via a rotating shaft, and a first telescopic hydraulic cylinder is installed near the bottom surface of the inclined support frame. The output end of the first telescopic hydraulic cylinder is fixedly connected to the lower end face of the support plate. The support plate is slidably connected to the inclined support frame. The side of the support plate is rotatably connected to the output end of a second telescopic hydraulic cylinder. The second telescopic hydraulic cylinder is rotatably connected to the upper end face of the base arm.

[0007] Preferably, when the boom is in the retracted state, the distance from the free end of the inclined support frame to the side of the support platform is less than the distance from the free end of the base boom to the side of the support platform.

[0008] Preferably, the boom is used for a truck crane.

[0009] Compared with the prior art, the beneficial effects of this utility model are:

[0010] An inclined support frame is installed on the support platform. A first pulley box is installed at the upper end of the inclined support frame. The free end of the boom is connected to a wire rope. The wire rope is connected to the drum through the first pulley box and the second pulley box. During the lifting process, part of the tension borne by the boom can be transmitted to the inclined support frame and the drum through the wire rope, which increases the lifting capacity of the boom.

[0011] The inclined support frame is rotatably connected to the support platform. A first telescopic cylinder is installed at the lower end of the inclined support frame. The output end of the first telescopic cylinder is fixedly connected to the lower end face of the support plate. The support plate is slidably connected to the inclined support frame. The output end of the second telescopic cylinder is rotatably connected to the side of the support plate. The second telescopic cylinder is rotatably connected to the upper end face of the base arm. During operation, the angle between the inclined support frame and the main boom can be changed by adjusting the second telescopic cylinder and locking the second telescopic cylinder to ensure that the inclined support frame is always at the most suitable angle.

[0012] After the work is completed, the first telescopic cylinder, the second telescopic cylinder, and the support plate can be adjusted to place the inclined support frame horizontally above the main boom, which facilitates the transfer of this utility model device. Attached Figure Description

[0013] Figure 1 A schematic diagram of the working state of this utility model;

[0014] Figure 2 This utility model is shown in a folded state.

[0015] In the diagram: 1. Main boom, 2. Boom lifting hydraulic cylinder, 3. Support platform, 4. Base boom, 5. Boom section, 6. Inclined support frame, 7. First pulley box, 8. Second pulley box, 9. Wire rope, 10. Drum, 11. First telescopic hydraulic cylinder, 12. Support plate, 13. Second telescopic hydraulic cylinder. Detailed Implementation

[0016] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0017] Please see Figures 1 to 2This utility model provides a technical solution: a boom with a stable support structure, including a main boom 1, a boom lifting hydraulic cylinder 2, and a support platform 3. The main boom 1 is rotatably connected to the support platform 3 on its side. The main boom 1 includes a base boom 4 and boom sections 5. A hydraulic cylinder and a rope system are installed inside the main boom 1. The hydraulic cylinder and rope system are common components of existing telescopic booms, and their specific structures and connections are existing knowledge and will not be described in detail here. It also includes a diagonal support frame 6, which can be constructed by fixedly connecting round or square tubes. The diagonal support frame 6 is installed on the top surface of the support platform 3, and a first pulley box 7 is installed on the top of the diagonal support frame 6. The top surface of the support platform 3 is also equipped with a second pulley box 8. The free end of the boom 5 is connected to the wire rope 9. A pressure sensor is installed at the connection between the wire rope 9 and the boom 5. The main component of the pressure sensor here is a strain gauge. The strain gauge is attached to the fixed part that is in direct contact with the wire rope 9. Of course, there are other technologies or methods in the crane device to measure the tension of the wire rope 9, such as installing a pressure sensor on the fixed pulley. The other end of the wire rope 9 is connected to the drum 10 through the first pulley box and the second pulley box. The drum 10 is connected to the drive device that drives the drum 10 to rotate and the brake that controls the rotation of the drum 10 and maintains the load position.

[0018] The purpose of setting up the first pulley box and the second pulley box is to change the direction of the tension on the wire rope 9 and to prevent the wire ropes 9 from getting tangled or interfering with each other. Any pulley arrangement that can achieve this purpose using existing technology or common sense is acceptable.

[0019] The inclined support frame 6 is rotatably connected to the support platform 3 via a rotating shaft. A first telescopic hydraulic cylinder 11 is installed near the bottom surface of the inclined support frame 6. The output end of the first telescopic hydraulic cylinder 11 is fixedly connected to the lower end face of the support plate 12. The support plate 12 is slidably connected to the inclined support frame 6. The side of the support plate 12 is rotatably connected to the output end of the second telescopic hydraulic cylinder 13. The second telescopic hydraulic cylinder 13 is rotatably connected to the upper end face of the base arm 4.

[0020] When the boom is in the retracted state (i.e., the main boom 1 is fully retracted and the inclined support frame 6 is in a horizontal state), the distance from the free end of the inclined support frame 6 to the side of the support platform 3 is less than the distance from the free end of the base boom 4 to the side of the support platform 3. The length of the inclined support frame 6 is set in this way so as not to increase the length of the entire device during the transfer process, thereby not affecting the ease of use of this utility model.

[0021] The boom described in this utility model is used in truck cranes.

[0022] It should be noted that the working modes of the drum 10 in this utility model include three types: First, free mode, where an external force (such as the extension of the boom) pulls the wire rope 9 to drive the drum 10 to rotate; Second, the drum 10 winds up and unwinds the wire rope 9 under load; Third, the drum 10 is positioned and maintains its position.

[0023] When using this utility model, firstly, switch the drum 10 from the third mode to the first mode, then control the first telescopic hydraulic cylinder 11 to move the support plate 12 away from the first telescopic hydraulic cylinder 11 to the set position and position it. During this process, the second telescopic hydraulic cylinder 13, which is rotatably connected to the support plate 12, will rotate and push the inclined support plate 12 to rotate. As the inclined support plate 12 rotates, the support plate 12 will rise a certain distance. Then, control the second telescopic hydraulic cylinder 13 to move the inclined support plate 12 to continue rotating a certain angle and position it. Of course, during this process, the length of the wire rope 9 will also change as the inclined support frame 6 rotates. The drum 10 in the first mode will not affect the change in the length of the wire rope 9, and therefore will not interfere with the above actions. Then, control the boom lifting hydraulic cylinder 2 to raise the main boom 1 to an appropriate angle. Then control the boom section 5 to extend the main boom 1 to a suitable position. Then control the second telescopic hydraulic cylinder 13 to rotate the inclined support frame 6 to the optimal position and position it. (When the inclined support frame 6 is in the optimal position, the angle between the wire rope 9 between the first pulley box 7 and the free end of the boom section 5 and the inclined support frame 6 is closest to 90 degrees.) At this time, switch the drum 10 to the second mode to tighten the wire rope 9. The sensor makes the wire rope 9 bear the appropriate tension. Then, switch the drum 10 to the third mode, that is, lock the length of the wire rope 9 outside the drum 10. This means that the length of the wire rope 9 between the inclined support frame 6 and the free end of the boom section 5 will not change. After that, part of the tension on the boom section 5 during the lifting process is transmitted to the inclined support frame 6 and the drum 10 through the wire rope 9. Finally, the main boom 1 rotates to lift the object, and the main boom 1 lowers to place the object.

[0024] After the lifting operation is completed, the drum 10 is switched to the second mode, then the boom 5 is retracted, the main boom 1 is lowered to a horizontal position, the second telescopic hydraulic cylinder 13 is fully retracted, and the first telescopic hydraulic cylinder 11 is fully retracted. The support plate 12 is also reset. During the retraction of the second telescopic hydraulic cylinder 13 and the first telescopic hydraulic cylinder 11, the inclined support frame 6 rotates and eventually reaches a horizontal position. Finally, the wire rope 9 is ensured to withstand the combined tension, and the drum 10 is switched to the third mode, that is, the combined tension is maintained and the length of the wire rope 9 is locked. Finally, the device of this utility model is transferred. At the same time, during the transfer process, the free end of the boom 5 is pulled by the wire rope 9 to prevent the free end from jumping outward during emergency stop.

[0025] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An arm support with a stable support structure, comprising a main arm support (1), an arm support lifting hydraulic cylinder (2) and a support table (3), the main arm support (1) comprising a base arm (4) and an arm section (5), characterized in that: Also include the cable-stayed support frame (6), the first pulley block box (7) is installed on the top of the cable-stayed support frame (6), the cable-stayed support frame (6) is installed on the top surface of the support platform (3), the second pulley block box (8) is also installed on the top surface of the support platform (3), the free end of the arm section (5) is connected with the steel wire rope (9), the connection between the steel wire rope (9) and the arm section (5) is provided with a pressure sensor, the other end of the steel wire rope (9) is connected with the reel (10) through the first pulley block and the second pulley block.

2. A boom having a stabilizing support structure according to claim 1, wherein: The cable-stayed support frame (6) is rotatably connected with the support platform (3) through a rotating shaft, the first telescopic hydraulic cylinder (11) is installed close to the bottom surface of the cable-stayed support frame (6), the output end of the first telescopic hydraulic cylinder (11) is fixedly connected with the lower end surface of the support plate (12), the support plate (12) is slidably connected with the cable-stayed support frame (6), the side surface of the support plate (12) is rotatably connected with the output end of the second telescopic hydraulic cylinder (13), and the second telescopic hydraulic cylinder (13) is rotatably connected with the upper end surface of the base arm (4).

3. A boom having a stabilizing support structure as claimed in claim 2, wherein: When the arm support is in the retracted state, the distance from the free end of the cable-stayed support frame (6) to the side surface of the support platform (3) is less than the distance from the free end of the base arm (4) to the side surface of the support platform (3).

4. A boom having a stabilizing support structure as claimed in claim 3, wherein: The arm support is used for a truck crane.

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