Crane jib, crane and method of installing a jib

Abstract

The application discloses a crane auxiliary arm, a crane and an installation method of the auxiliary arm. In a suspension state, the auxiliary arm only has a degree of freedom along the extension direction of the main crane arm; a guide support is arranged on the main crane arm to guide the auxiliary arm; a main arm hinge point extending outward is arranged on the head of the main crane arm, and a auxiliary arm hinge point matched with the main arm hinge point is arranged on the head of the auxiliary arm; a neighboring auxiliary arm hinge point hole and an auxiliary arm pin shaft hole are arranged on the auxiliary arm hinge point; the auxiliary arm pin shaft hole is used for limiting the arrangement of the pin shaft; and a limiting clamping groove is arranged on the edge of the hinge joint of the main arm hinge point and the auxiliary arm hinge point. The application solves the problems of the difficulty in the shaft arrangement in the auxiliary arm assembly process and the auxiliary arm deflection caused by the self weight in the auxiliary arm assembly process, and the problems of the difficulty in the auxiliary arm recovery and the auxiliary arm support. A new auxiliary arm disassembly and assembly mode is provided, the original disassembly and assembly mode is broken, the convenience of the auxiliary arm disassembly and assembly is greatly improved, and the auxiliary arm recovery can be completed by one person.

Description

Technical Field

[0001] This invention relates to the field of crane booms, and more particularly to a crane jib, a crane and a method for installing the jib. Background Technology

[0002] A crane boom is typically constructed by joining two bent, channel-shaped steel plates together, consisting of multiple sections assembled using an embedded assembly method. It can extend and retract between the sections using hydraulic cylinders. The jib, on the other hand, is a structural component designed to increase lifting height and radius under special working conditions, usually suspended on the side of the boom. In use, it is horizontally rotated around the boom head to complete the connection.

[0003] The jib of a crane plays a vital role in extending lifting height, expanding the working radius, and improving work efficiency. The jib has two states: one is the suspended state, as shown in the attached diagram. Figure 1-2 As shown, in the first state, the auxiliary boom 20 is fixed to the side of the main boom 10; in the second state, the auxiliary boom 20 is fixed to the boom head of the main boom 10. When the auxiliary boom 20 is not in use, it is suspended on the side of the main boom 10. In this state, the auxiliary boom 20 is connected to the main boom 10 through the auxiliary boom bracket, which has the functions of support and fixation. The auxiliary boom bracket includes a front bracket 30, a middle bracket 40, and a rear bracket 50.

[0004] The installation process of the auxiliary boom 20 in the prior art is as follows: First, release the fixing constraints of the middle bracket 40 and the rear bracket 50 on the auxiliary boom 20. At this time, the auxiliary boom 20 can rotate around the limiting shaft of the front bracket 30. Rotate the auxiliary boom 20 so that the auxiliary boom hinge hole 21 and the main boom hinge hole 11 are aligned, and install the right-side pin. Then, pull out the limiting shaft of the front bracket 30 (release the restriction of the front bracket 30 on the auxiliary boom 20), and continue to rotate the auxiliary boom 20 to the front of the main boom to install the left-side pin. Figure 2 The state shown.

[0005] The above installation method has the following problems: During the recovery process, the auxiliary boom 20 will deflect downward due to gravity, making it difficult for it to reach the middle support 40 and the rear support 50. In addition, when assembling the auxiliary boom 20, the coaxiality deviation between the auxiliary boom hinge hole 21 and the main boom hinge hole 11 is often large. It is necessary to adjust the extension distance of the last section of the main boom 10 or adjust the position of the auxiliary boom 20 to reduce the coaxiality deviation of the hinge hole. Then, the pin is hit with a hammer for assembly, which makes the assembly process difficult. Summary of the Invention

[0006] Purpose of the invention: In order to solve the problems existing in the prior art, the present invention provides a crane jib, a crane and a jib installation method, which solves the problem of difficult assembly of the jib caused by the coaxiality deviation of the hinge point hole, and effectively improves the ease of disassembly and assembly of the jib.

[0007] Technical Solution: To achieve the above objectives, the present invention can adopt the following technical solution: a crane jib, in a suspended state, the jib is connected to the main boom and has only a degree of freedom along the extension direction of the main boom; at least one guide bracket is provided in the middle section of the main boom; the guide bracket is provided with a guide shaft seat along the horizontal extension direction of the main boom; the groove on the guide shaft seat has a U-shaped structure and is open near the boom head of the main boom; the jib is provided with a guide pin that passes through the guide shaft seat and is slidably connected to the groove;

[0008] The main boom head has at least two main boom hinge points extending outwards, and each main boom hinge point has a main boom hinge point hole. The auxiliary boom head also has an auxiliary boom hinge point that mates with the main boom hinge points, and each auxiliary boom hinge point has an adjacent auxiliary boom hinge point hole and an auxiliary boom pin hole. The auxiliary boom hinge point hole is located close to the main boom hinge point and mates with the main boom hinge point hole. The auxiliary boom pin hole is used for the insertion of a limiting pin, and a limiting groove is provided at the edge of the hinge joint between the main boom hinge point and the auxiliary boom hinge point.

[0009] Furthermore, in the suspended state, the auxiliary boom is connected to and supported on the main boom via a front pulley frame and a rear pulley frame, ensuring the stability of its suspended state; the front pulley frame is also equipped with a spring assembly that elastically deforms along the horizontal extension direction of the main boom.

[0010] Furthermore, the auxiliary boom is connected to the main boom by the front pulley frame and the rear pulley frame via a positioning pin.

[0011] There is a ramp between the front pulley frame and the rear pulley frame. This ramp overcomes the deformation of the auxiliary boom caused by gravity during the extension and retraction of the auxiliary boom driven by the main lifting boom.

[0012] Furthermore, the main arm hinge points are four in number, symmetrically located at the four corners of the arm head.

[0013] Furthermore, the auxiliary boom is provided with pulleys along the extension direction of the main boom, which are in rolling friction contact with the front pulley frame and the rear pulley frame.

[0014] Furthermore, the spring assembly on the front pulley frame includes three evenly spaced springs to maintain more stable elastic deformation support.

[0015] In some embodiments, the limiting slot is a V-shaped limiting slot.

[0016] The present invention also includes a crane comprising: the aforementioned auxiliary boom; and a main boom connected to the auxiliary boom.

[0017] The above-mentioned method for installing the crane's auxiliary boom includes the following steps:

[0018] (1) First, insert the limiting pin into the pin hole of the auxiliary boom, then remove the positioning pins of the front pulley frame and the rear pulley frame. Under the restriction of the guide shaft seat on the guide bracket, the auxiliary boom and the front pulley frame and the rear pulley frame move along the direction of the main boom through the pulleys.

[0019] (2) Retract the main boom. Due to the limitation of the limit pin, the V-shaped limit slot on the main boom hinge point causes the main boom to drive the auxiliary boom to move backward. The spring of the front pulley frame is compressed. At this time, it is necessary to stop the main boom retraction. The main boom hinge point hole and the auxiliary boom hinge point hole meet the coaxial condition. Insert the hinge pin to complete the hinge assembly, and then pull out the limit pin.

[0020] (3) Perform the main boom extension action so that the guide pin of the guide bracket is disengaged from the slide groove. At this time, the auxiliary boom is also disengaged from the front pulley frame and the rear pulley frame. Stop the extension and retraction of the main boom. With the hinge pin as the rotation center, pull out the auxiliary boom and turn it to the front of the main boom head.

[0021] (4) Install the hinge pin on the other side: Rotate the auxiliary boom to the front of the main boom head with the hinge pin of the auxiliary boom hinge point hole as the rotation center. After the auxiliary boom hinge point hole and the main boom hinge point hole are coaxial, assemble the hinge pin on this side; after the auxiliary boom is assembled, install other accessories and it can be used.

[0022] (5) The recovery process of the auxiliary arm can be completed by disassembling in the reverse order.

[0023] Beneficial effects: The present invention has the following advantages: (1) It solves the problem of difficulty in threading the shaft during the assembly of the auxiliary boom; it solves the problem that the auxiliary boom sags due to its own weight during the assembly of the auxiliary boom, which leads to a certain difficulty in the auxiliary boom support during the recovery of the auxiliary boom. (2) It proposes a new method for disassembling and assembling the auxiliary boom, breaking the original inherent disassembly and assembly mode; it greatly improves the convenience of disassembling and assembling the auxiliary boom, and the auxiliary boom can be recovered by a single person. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the suspended state structure of the jib of a crane in the prior art.

[0025] Figure 2 This is a schematic diagram of the working state structure of the jib of a crane in the prior art.

[0026] Figure 3 This is a schematic diagram of the auxiliary boom suspension state structure in Embodiment 1 of the present invention;

[0027] Figure 4 This is a schematic diagram of the front pulley frame structure in the suspended state of the auxiliary boom in Embodiment 1 of the present invention;

[0028] Figure 5 This is a schematic diagram of the front pulley frame structure in the suspended state of the auxiliary boom in Embodiment 1 of the present invention;

[0029] Figure 6 This is a schematic diagram of the auxiliary boom mounting hinge point structure in the auxiliary boom suspension state in Embodiment 1 of the present invention;

[0030] Figure 7 This is a schematic diagram of the rear pulley frame structure in the suspended state of the auxiliary boom in Embodiment 1 of the present invention;

[0031] Figure 8 This is an isometric structural diagram of the guide bracket in the suspended state of the auxiliary boom in Embodiment 1 of the present invention;

[0032] Figure 9 This is a schematic diagram of the auxiliary arm limiting pin installation structure in Embodiment 1 of the present invention;

[0033] Figure 10 This is a schematic diagram of the mounting structure of the auxiliary boom hinge pin in Embodiment 1 of the present invention;

[0034] Figure 11 This is a schematic diagram of the main lifting boom driving the auxiliary boom to extend in Embodiment 1 of the present invention;

[0035] Figure 12 This is a schematic diagram of the structure in Embodiment 1 of the present invention where the auxiliary boom rotates to the front of the main boom;

[0036] Figure 13 This is a schematic diagram of the auxiliary boom pin installation structure after the auxiliary boom assembly is completed in Embodiment 1 of the present invention.

[0037] Figure 3-13 The designations are as follows: 100-Main boom, 200-Auxiliary boom, 600-Front pulley frame, 601-Positioning pin, 602-Spring assembly, 700-Rear pulley frame, 110-Main boom hinge point, 111-Main boom hinge point hole, 112-Limiting slot, 210-Auxiliary boom hinge point, 211-Auxiliary boom hinge point hole, 212-Auxiliary boom pin hole, 213-Limiting pin, 214-Hinge pin, 800-Guide bracket, 801-Guide shaft pin, 803-Slide groove, 202-Guide shaft seat. Detailed Implementation

[0038] Example 1:

[0039] like Figure 1-13As shown, this invention discloses a crane jib. In the suspended state, the jib 100 is connected to and supported on the main boom 100 by a front pulley frame 600 and a rear pulley frame 700 via a positioning pin 601, ensuring its stability in the suspended state. The front pulley frame 600 is also provided with a spring assembly 602 that elastically deforms along the horizontal extension direction of the main boom. The spring assembly 602 includes three evenly arranged springs to maintain more stable elastic deformation support. The auxiliary boom 200 is connected to the main boom 100 and has only a degree of freedom along the extension direction of the main boom 100; a guide bracket 800 is provided in the middle section of the main boom 100; a guide shaft seat 202 is provided on the guide bracket 800 along the horizontal extension direction of the main boom 100; the sliding groove 803 on the guide shaft seat 202 has a U-shaped structure and is open near the boom head of the main boom 100; a guide pin 801 is provided on the auxiliary boom 200, which passes through the guide shaft seat 202 and is slidably connected to the sliding groove 803;

[0040] The main boom 100 has four outwardly extending main boom hinge points symmetrically located at the four corners of the boom head. Each main boom hinge point 110 has a main boom hinge point hole 111. The auxiliary boom 200 also has an auxiliary boom hinge point 210 that mates with the main boom hinge point 110. The auxiliary boom hinge point 210 has an adjacent auxiliary boom hinge point hole 211 and an auxiliary boom pin hole 212. The auxiliary boom hinge point hole 211 is positioned close to and mates with the main boom hinge point 110. The auxiliary boom pin hole 212 is used for the passage of the auxiliary boom limiting pin 213. A limiting groove 112 is provided at the edge of the hinge between the main boom hinge point 110 and the auxiliary boom hinge point 210. This limiting groove 112 has a V-shaped limiting groove structure.

[0041] A ramp exists between the front pulley frame 600 and the rear pulley frame 700. This ramp overcomes the deformation of the auxiliary boom 200 caused by gravity during the extension and retraction of the auxiliary boom 200 driven by the main lifting arm 100. Rollers are provided between the auxiliary boom 200 and the front pulley frame 600 and the rear pulley frame 700, along the extension direction of the main lifting arm 100, allowing for rolling friction contact.

[0042] The present invention also includes a crane comprising: the aforementioned auxiliary boom 200; and a main boom 100, the main boom 100 being connected to the auxiliary boom 200.

[0043] The installation method of the above-mentioned crane jib 200 includes the following steps:

[0044] (1) First, insert the limiting pin 213 into the auxiliary boom pin hole 212, then remove the positioning pin 601 of the front pulley frame 600 and the rear pulley frame 700. Under the restriction of the guide shaft seat 202 on the guide bracket 800, the auxiliary boom 200 and the front pulley frame 600 and the rear pulley frame 700 move along the direction of the main lifting boom 100 through the pulleys.

[0045] (2) When the main boom 100 is retracted, the V-shaped limit slot 112 on the main boom hinge point 110 is restricted by the limit pin 213, causing the main boom 100 to drive the auxiliary boom 200 to move backward. The spring assembly 602 of the front pulley frame 600 is compressed. At this time, the retraction of the main boom 100 needs to be stopped. The main boom hinge point hole 111 and the auxiliary boom hinge point hole 211 meet the coaxial condition. The hinge pin 214 is inserted to complete the hinge assembly. Then the limit pin 213 is pulled out.

[0046] (3) Extend the main boom 100 so that the guide pin 801 of the guide bracket 800 disengages from the slide groove 803. At this time, the auxiliary boom 200 also disengages from the front pulley frame 600 and the rear pulley frame 700. Stop the extension and retraction of the main boom 100. With the hinge pin 214 as the rotation center, pull out the auxiliary boom 200 and rotate it to the front of the boom head of the main boom 100.

[0047] (4) Install the hinge pin 214 on the other side: Rotate the auxiliary boom 200 to the front of the boom head of the main boom 100 with the hinge pin 214 of the auxiliary boom hinge hole 211 as the rotation center. After the auxiliary boom hinge hole 211 and the main boom hinge hole 111 are coaxial, assemble the hinge pin 214 on this side. After the auxiliary boom 200 is assembled, install other accessories and it can be used.

[0048] (5) The recovery process of the auxiliary arm 200 can be completed by disassembling in the reverse order.

[0049] This invention provides a crane jib structure that solves the problems of difficult shaft insertion during jib assembly and the jib sagging due to its own weight during assembly, which hinders jib retraction. Furthermore, it proposes a new jib assembly / disassembly method, breaking away from the existing assembly / disassembly patterns; significantly improving the ease of jib assembly / disassembly, allowing for jib retraction to be completed by a single person.

Claims

1. A crane jib, characterised in that: In the suspended state, the auxiliary boom is connected to the main lifting boom and has only a degree of freedom along the extension direction of the main lifting boom; the middle section of the main lifting boom is provided with at least one guide support; the guide support is provided with a guide shaft seat along the horizontal extension direction of the main lifting boom; the sliding groove on the guide shaft seat is of a U-shaped structure, and is of an open structure near the head of the main lifting boom; the auxiliary boom is provided with a guide pin shaft that penetrates the guide shaft seat and is connected to the sliding groove; The head of the main lifting boom is provided with at least two main boom hinge points extending outward, and the main boom hinge points are provided with a main boom hinge point hole; the head of the auxiliary boom is also provided with an auxiliary boom hinge point matched with the main boom hinge point, and the auxiliary boom hinge point is provided with an adjacent auxiliary boom hinge point hole and an auxiliary boom pin shaft hole; the auxiliary boom hinge point hole is arranged close to the main boom hinge point and is matched with the main boom hinge point hole; the auxiliary boom pin shaft hole is used for penetrating a limiting pin shaft; the edge of the hinge joint between the main boom hinge point and the auxiliary boom hinge point is provided with a limiting clamping groove. In the suspended state, the auxiliary boom is connected to the main lifting boom by the positioning pin shafts of the front pulley frame and the rear pulley frame; the front pulley frame is further provided with a spring assembly that elastically deforms along the horizontal extension direction of the main lifting boom. The auxiliary boom is installed by the following method: (1) First, the limiting pin shaft is penetrated into the auxiliary boom pin shaft hole, and then the positioning pin shafts of the front pulley frame and the rear pulley frame are removed. Under the limitation of the guide shaft seat on the guide support, the auxiliary boom is translated along the main lifting boom direction by the front pulley frame and the rear pulley frame through the pulleys; (2) The main lifting boom is retracted. The V-shaped limiting clamping groove on the main boom hinge point is limited by the limiting pin shaft, so that the main lifting boom drives the auxiliary boom to move backward, and the spring of the front pulley frame is compressed. At this time, the retraction of the main lifting boom needs to be stopped, the main boom hinge point hole and the auxiliary boom hinge point hole satisfy the coaxial condition, the hinge pin shaft is put in, and the hinge assembly is completed, and then the limiting pin shaft is pulled out; (3) The main lifting boom is extended, so that the guide pin shaft of the guide support is separated from the sliding groove, and at this time, the auxiliary boom is separated from the front pulley frame and the rear pulley frame. Stop the main lifting boom from retracting and extending, take the auxiliary boom as the rotating center of the hinge pin shaft, pull out the auxiliary boom, and turn to the front of the head of the main lifting boom; (4) Install the hinge pin shaft on the other side: take the hinge pin shaft of the auxiliary boom hinge point hole as the rotating center, turn the auxiliary boom to the front of the head of the main lifting boom, and then install the hinge pin shaft on the other side after the auxiliary boom hinge point hole and the main boom hinge point hole are coaxial; after the auxiliary boom is assembled, other accessories are installed, and the auxiliary boom can be used; (5) The auxiliary boom is recycled in the reverse order.

2. A crane jib according to claim 1, characterised in that: There is a slope between the front pulley frame and the rear pulley frame.

3. A crane jib according to claim 1, characterised in that: The main boom hinge point is four, symmetrically arranged on the four corners of the head.

4. A crane jib according to claim 1, characterised in that: The auxiliary boom, the front pulley frame and the rear pulley frame are provided with pulleys along the extension direction of the main lifting boom.

5. A crane jib according to claim 4, characterised in that: The spring assembly on the front pulley frame includes three uniformly arranged springs.

6. A crane jib according to claim 1, characterised in that: The limiting clamping groove is a V-shaped limiting clamping groove.

7. A crane, characterized in that It comprises: The auxiliary boom according to any one of claims 1-6; and the main lifting boom connected with the auxiliary boom.

8. A method of mounting a jib for a crane according to any one of claims 1-6, characterized in that It comprises the following steps: (1) First, the limiting pin shaft is inserted into the auxiliary arm pin shaft hole, and then the positioning pin shaft of the front and rear pulley frames is removed. Under the restriction of the guide shaft seat on the guide support, the auxiliary arm and the front and rear pulley frames are translated along the direction of the main lifting arm through the pulleys; (2) The main lifting arm is retracted. The V-shaped limiting slot on the main arm hinge point is restricted by the limiting pin shaft, so that the main lifting arm drives the auxiliary arm to move backward, and the spring of the front pulley frame is compressed. At this time, the main arm retraction needs to be stopped, the main arm hinge point hole and the auxiliary arm hinge point hole satisfy the coaxial condition, the hinge pin shaft is put in, the hinge assembly is completed, and the limiting pin shaft is pulled out; (3) The main lifting arm is extended. The guide pin shaft of the guide support is separated from the sliding groove, and the auxiliary arm is separated from the front and rear pulley frames. Stop the main arm retraction, take the auxiliary arm as the rotation center, pull out the auxiliary arm, and turn to the front of the main arm head; (4) Installation of the hinge pin shaft on the other side: the auxiliary arm is rotated to the front of the main arm head with the hinge pin shaft in the auxiliary arm hinge point hole as the rotation center. After the auxiliary arm hinge point hole and the main arm hinge point hole are coaxial, the hinge pin shaft on this side is assembled. After the auxiliary arm assembly is completed, other accessories are installed, and the crane can be used; (5) The auxiliary arm recovery process can be completed by disassembling in the reverse order.

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