A method for manufacturing a hinge point support structure of a portal crane

Abstract

This invention discloses a manufacturing method for a hinge point support structure of a gantry crane's A-frame. The hinge point support structure manufactured using this method directly transmits force and exhibits excellent force transmission performance. Compared to existing technologies, it reduces stress concentration leading to fatigue damage, increases the load-bearing capacity of the hinge point support structure, extends the service life of components, improves equipment performance, and reduces maintenance costs. Furthermore, the hinge point support structure can be integrally bored using the integral boring device, ensuring that the shaft holes of supports such as the balance beam and tie rod are aligned. This method is convenient, saves time, and increases installation efficiency. During installation, the support can be welded to the panel first, prioritizing the vertical alignment of the upper and lower welds. Then, the boring device performs precision machining to align the shaft holes of the relevant supports horizontally, simplifying the processing technology and ensuring installation accuracy.

Description

Technical Field

[0001] The invention relates to the technical field of crane equipment, in particular to a method for manufacturing a hinge point support structure of a portal crane. Background Art

[0002] The existing gantry crane A-frame hinge support structure is mainly composed of a large tie rod support, a balance beam support and a pulley support, and each support is installed on the panel of the A-frame top platform. Figure 7 , 8 As shown, before installation, the bottom surface of the support base plate needs to be planed and processed, and then the support base plate is welded to the panel of the A-frame platform after processing. However, in practice, we found that due to the large alternating stress of the large tie rod support and the balance beam support during the operation of the crane, the existing support structure is prone to fatigue damage after a few years of use, resulting in cracks in the welds and the support main board, which seriously affects the performance of the whole machine. At the same time, since the centers of the large tie rod support and the balance beam support must be coaxial, the support base plate and the upper surface of the A-frame panel need to be positioned before installation and welding. The existing installation process uses a dummy shaft for positioning. Since the diameters of the shaft holes of each support are different, steel sleeves of different diameters need to be welded on the dummy shaft. The process is complicated, time-consuming, and costly. In addition, each type of gantry crane requires a dummy shaft for positioning, which makes management and maintenance difficult. Summary of the invention

[0003] In view of the problems existing in the prior art, the technical purpose of the present invention is to provide a method for manufacturing a herringbone frame hinge point support structure of a gantry crane, so as to improve the structural strength, installation efficiency and installation accuracy of the herringbone frame hinge point support structure.

[0004] In order to achieve the above technical objectives, the technical solution provided by the present invention is:

[0005] A method for manufacturing a hinge point support structure of a portal crane, characterized in that it comprises the following steps:

[0006] 1) Make the top platform of the herringbone frame with box-type structure

[0007] A horizontal panel is provided on the top of the top platform of the herringbone frame, and a plurality of longitudinal ribs connected to the panel are welded below the panel in a direction parallel to the main support plates of the balance beam support and the large tie rod support, that is, the extension direction of the longitudinal ribs is parallel to the main support plates of the two.

[0008] When welding, the longitudinal ribs are arranged vertically, kept perpendicular to the panel, and their tops are fixedly connected to the panel by welding;

[0009] 2) Install the support

[0010] Arrange a number of balance beam supports and large tie rod supports above the panel according to preset positions and perform preliminary positioning before welding;

[0011] During the initial positioning process:

[0012] In the vertical direction of the panel, the main plates of the balance beam support and the large tie rod support are aligned with a longitudinal rib plate below the panel, that is, the weld connecting the main plate of the support and the panel and the weld connecting the corresponding longitudinal rib plate and the panel are aligned in the vertical direction;

[0013] In the axial direction, align the axial holes on the main plates of the balance beam support and the large tie rod support in the axial direction, so that the boring bar can pass through all the axial holes on the balance beam support and the large tie rod support to complete the rough alignment;

[0014] 3) Axis hole calibration

[0015] Use the integral boring device to perform precision calibration of the shaft holes of the welded balance beam support and large tie rod support;

[0016] The integral boring device comprises a tool module, a power module, a positioning bracket and the boring bar;

[0017] The power module includes a boring power head for driving the boring bar to rotate, a slide table for controlling the linear feed motion of the boring power head, and a base for mounting and fixing the slide table;

[0018] The positioning bracket is provided with an axial hole for a radially limited boring bar, including an end bracket;

[0019] The boring bar is a horizontally arranged straight bar, the diameter of which is smaller than the axial holes of the balance beam support and the large tie rod support;

[0020] The tool module comprises a plurality of boring tools, which are detachably mounted on the boring bar and correspond one by one to the support mainboards of the holes to be bored;

[0021] The process of the fine calibration process is as follows:

[0022] The top platform of the herringbone frame is laid flat and fixed, the power module is arranged on one side of the top platform of the herringbone frame, and the end bracket is arranged on the other side of the top platform of the herringbone frame;

[0023] One end of the boring rod is connected to the boring power head of the power module, and the other end passes through the shaft holes of the balance beam support and the large tie rod support in sequence, and is limitedly installed in the shaft hole of the end bracket so that it can only move linearly along the axial direction;

[0024] Fix the top platform of the A-frame, the power module and the bottom of the positioning bracket;

[0025] A pair of boring tools are installed on the boring bar beside the main board of the support to be bored. Driven by the boring power head, each boring tool rotates around the central axis of the boring bar. The boring bar moves laterally under the drive of the slide. Multiple boring tools are used to complete the overall boring of the balance beam support and the large tie rod support, so that the centers of the axial holes of the balance beam support and the large tie rod support are accurately aligned in a straight line.

[0026] Furthermore, the positioning bracket also includes an intermediate bracket, which is arranged between adjacent balance beam supports and large pull rod supports. The boring rod passes through the axial holes of the support main board and the intermediate bracket in sequence, and the end is installed in the axial hole of the end bracket. The bottom of the intermediate bracket is fixed on the panel of the top platform of the A-frame. After the overall boring is completed, it is removed from the panel.

[0027] Beneficial effects:

[0028] The hinge support structure of the portal crane manufactured by the method of the present invention has direct force transmission and good force transmission performance. Compared with the prior art, it can reduce the fatigue damage of the hinge support structure caused by stress concentration, improve the bearing capacity of the hinge support structure, extend the service life of the components, improve the performance of the equipment and reduce the maintenance cost. At the same time, the hinge support structure can be integrally bored by the integral boring device to ensure that the axial holes of the supports such as the balance beam and the large pull rod are in a straight line, and the operation is convenient. There is no need to weld a steel sleeve on the dummy shaft to adapt to the difference in the size of the axial hole of the support main board, which saves man-hours. In the installation process, the support can be welded and fixed to the panel first, so as to ensure the correspondence of the upper and lower welds in the vertical direction first. Then, the axial holes of the relevant supports are aligned in the horizontal direction through the fine processing of the boring device, which simplifies the processing technology and ensures the installation accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 This is the overall structural diagram of the crane;

[0030] Figure 2 It is a side view of the support structure on the herringbone frame;

[0031] Figure 3 It is the main view of the support structure on the herringbone frame;

[0032] Figure 4 This is a schematic diagram of welding between the support and the panel;

[0033] Figure 5 This is a schematic diagram of the installation of the boring device;

[0034] Figure 6 This is a schematic diagram of the installation of the bracket structure;

[0035] Figure 7 It is a side view of the existing support;

[0036] Figure 8 This is the main view of the existing support.

[0037] In the above figure: 1. A-frame; 1-1. Panel; 1-2. Longitudinal rib plate; 2. Balance beam; 3. Large tie rod; 4. Balance beam support; 5. Large tie rod support; 6. Pulley support; 7-1. Power head; 7-2. Boring rod; 7-3. Boring tool; 7-4. Intermediate bracket; 7-5. End bracket; 7-6. Intermediate bracket; 8-weld; 9-1. Support bottom plate; 9-2. Support main plate; 9-3. Support side plate. DETAILED DESCRIPTION

[0038] To illustrate the technical solution and working principle of the present invention, the present invention is further introduced below in conjunction with the accompanying drawings and specific embodiments.

[0039] like Figure 1 A portal crane is shown, which is provided with a balance beam 2 and a large pull rod 3, wherein the balance beam 2 and the large pull rod 3 are connected to the top platform of the crane's A-frame via a hinge support structure.

[0040] The hinge support structure includes two balance beam supports 4, a large tie rod support 5 and two pulley supports 6. The large tie rod support 5 is located in the middle, and the two pulley supports 6 are symmetrically arranged on the left and right sides of the large tie rod support 5. The two balance beam supports 4 are respectively arranged on the outside of the two pulley supports 6, and the positions are symmetrical.

[0041] Each of the above-mentioned supports (balance beam support 4, large pull rod support 5 and pulley support 6) is provided with two parallel left and right support main boards, and corresponding axial holes are provided on the two support main boards. The balance beam support 4 and the large pull rod support 5 are also provided with side plates connecting the left and right support main boards. Different from the prior art, they do not have a bottom plate.

[0042] The top platform of the herringbone frame is a box-type structure, comprising a top plate, a bottom plate, side plates and rib plates arranged inside the box body for strengthening the structure.

[0043] The integral boring device is composed of components such as a boring bar 7-2, a tool module, a power module and a positioning bracket.

[0044] The power module includes a boring power head 7-1, a slide and a base. The boring rod 7-2 is a horizontally arranged straight rod, one end of which is connected to the boring power head 7-1 and is driven to rotate by the boring power head 7-1. The boring power head 7-1 is installed on the slide, and the slide provides the feed force to control the power head 7-1 to do horizontal linear operation. The slide is installed on the base below it.

[0045] This embodiment takes the positioning and installation of the balance beam support 4 and the large tie rod support 5 as an example to introduce the structure of the positioning bracket. Figure 5As shown, the positioning bracket includes an end bracket 7-5 and a plurality of intermediate brackets. The power module is arranged on the right side of the hinge support structure, and the end bracket 7-5 is arranged on the left side of the hinge support structure, at the opposite end to the power module. The two intermediate brackets 7-4 and 7-6 are respectively arranged between the two balance beam supports 4 and the large tie rod support 5. When boring, the boring rod 7-2 passes through the support main boards of the two balance beam supports 4 and the large tie rod support 5, as well as the shaft holes of the two intermediate brackets in sequence. One end of the boring rod 7-2 is connected to the power head 7-1, and the other end is installed on the end bracket 7-5. The end bracket 7-5 and the intermediate bracket are both provided with shaft holes for radially limiting the boring rod 7-2 (limited bearings are installed in the shaft holes, and the boring rod 7-2 passes through the inner ring of the bearing), so that the boring rod 7-2 only has the freedom to make lateral linear motion. The diameter of the boring bar 7-2 is smaller than the axial holes of all the balance beam supports 4 and the large tie rod supports 5. Therefore, before welding the balance beam supports 4 and the large tie rod supports 5 to the panel, during the initial alignment, the boring bar 7-2 can pass through the main boards of each support. The installation accuracy is relatively low compared to the existing technology and can be operated quickly.

[0046] The tool module comprises a plurality of boring tools 7-3, which are detachably mounted on the boring rod 7-2 in series and correspond one to one with the support mainboards of the holes to be bored.

[0047] The manufacturing method of the portal crane herringbone hinge support structure specifically comprises the following steps:

[0048] 1) Make the top platform of the herringbone frame with box-type structure

[0049] A horizontally arranged panel 1-1 (top panel) is provided on the top of the top platform of the herringbone frame. Below the panel 1-1, a plurality of longitudinal ribs connected to the panel 1-1 are welded in a direction parallel to the main support plates of the balance beam support 4 and the large tie rod support 5, that is, the extension direction of the longitudinal ribs 1-2 is parallel to the main support plates of the two.

[0050] During welding, the longitudinal rib plate 1-2 is arranged vertically, kept perpendicular to the panel 1-1, and its top is fixedly connected to the panel 1-1 by welding;

[0051] 2) Install the support

[0052] Arrange a plurality of balance beam supports 4 and large tie rod supports 5 at preset positions above the panel 1-1 and perform preliminary positioning before welding;

[0053] During the initial positioning process:

[0054] In the vertical direction of the panel, the main support plates of the balance beam support 4 and the large tie rod support 5 are aligned with a longitudinal rib plate below the panel 1-1, that is, the weld connecting the main support plate and the panel 1-1 and the weld connecting the corresponding longitudinal rib plate 1-2 and the panel 1-1 are aligned in the vertical direction;

[0055] In the axial direction, the axial holes on the main plates of the balance beam support 4 and the large tie rod support 5 are aligned in the axial direction, so that the boring bar 7-2 can pass through all the axial holes on the balance beam support 4 and the large tie rod support 5 to complete the rough alignment;

[0056] 3) Axis hole calibration

[0057] The integral boring device is used to perform precision calibration of the axial holes of the welded balance beam support 4 and the large tie rod support 5;

[0058] The process of the fine calibration process is as follows:

[0059] The top platform of the herringbone frame is laid flat and fixed, the power module is arranged on one side of the top platform of the herringbone frame, the end bracket 7-5 is arranged on the other side of the top platform of the herringbone frame, and the intermediate brackets 7-3 and 7-4 are arranged between the adjacent balance beam support 4 and the large tie rod support 5 respectively;

[0060] One end of the boring rod 7-2 is connected to the boring power head 7-1 of the power module, and the other end passes through the axial holes of the balance beam support 4, the large tie rod support 5 and the two intermediate brackets in sequence, and is limitedly installed in the axial hole of the end bracket 7-5 so that it can only move linearly in the axial direction (lateral direction);

[0061] The bottom of the herringbone frame top platform, power module and positioning bracket are fixed so that the three will not produce overall relative displacement to ensure processing stability. Among them, the bottom of the middle bracket is fixed on the panel 1-1 of the herringbone frame top platform. After the overall boring is completed, it is removed from the panel 1-1;

[0062] A pair of boring tools 7-3 are installed on the boring bars 7-2 beside the support mainboard to be bored. The boring bars 7-2 are provided with a plurality of mounting holes for mounting tools. The radial length of the boring tool extending out of the boring bar 7-2 is selected and determined according to the size of the support mainboard shaft hole to ensure that the processing result meets the requirements of the support mainboard shaft hole diameter in the drawing;

[0063] Driven by the boring power head 7-1, each boring cutter 7-3 rotates around the central axis of the boring rod 7-2, and the boring rod 7-2 moves horizontally under the drive of the slide, and multiple boring cutters 7-3 are used to complete the integral boring (expansion) of the balance beam support 4 and the large tie rod support 5.

[0064] After the processing is completed, the centers of the main board shaft holes of the balance beam support 4 and the large tie rod support 5 are precisely aligned on a straight line. The six boring points of the three supports are adjusted and processed at the same time, which ensures coaxiality and saves time.

[0065] 4) Afterwards, the integral boring device is removed and the next installation process is carried out, including the installation of the pulley support 6.

[0066] In practice, depending on the specific situation, the pulley support 6 can also be installed in the same way together with the balance beam support 4 and a large tie rod support 5, so that the two support main boards are aligned with the longitudinal ribs below, and are bored as a whole together with the balance beam support 4 and the large tie rod support 5.

[0067] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments, and the above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, and the scope of protection of the present invention is defined by the attached claims, description and their equivalents.

Claims

1. A method for manufacturing a hinge point support structure of a portal crane, characterized in that: The following steps are involved: 1) Make the top platform of the herringbone frame with box-type structure A horizontally arranged panel (1-1) is provided on the top of the top platform of the herringbone frame, and a plurality of longitudinal ribs connected to the panel (1-1) are welded below the panel (1-1) in a direction parallel to the support main boards of the balance beam support (4) and the large tie rod support (5), that is, the extension direction of the longitudinal ribs (1-2) is parallel to the support main boards of the two. During welding, the longitudinal rib plate (1-2) is arranged vertically to be kept perpendicular to the panel (1-1), and its top is fixedly connected to the panel (1-1) by welding; 2) Install the support Arranging a plurality of balance beam supports (4) and large tie rod supports (5) at preset positions above the panel (1-1) and performing preliminary positioning before welding; During the initial positioning process: In the vertical direction of the panel, each support main plate of the balance beam support (4) and the large tie rod support (5) is aligned with a longitudinal rib plate below the panel (1-1) in the upper and lower directions, that is, the weld connecting the support main plate and the panel (1-1) and the weld connecting the corresponding longitudinal rib plate (1-2) and the panel (1-1) are aligned in the vertical direction; In the axial direction, the axial holes on the main plates of the balance beam support (4) and the large tie rod support (5) are aligned in the axial direction, so that the boring bar (7-2) can pass through all the axial holes on the balance beam support (4) and the large tie rod support (5), thereby completing the rough alignment; 3) Axis hole calibration Using an integral boring device to perform precision calibration processing on the axial holes of the welded balance beam support (4) and the large tie rod support (5); The integral boring device comprises a tool module, a power module, a positioning bracket and the boring bar (7-2); The power module comprises a boring power head (7-1) for driving a boring rod (7-2) to rotate, a slide table for controlling the linear feed motion of the boring power head (7-1), and a base for mounting and fixing the slide table; The positioning bracket is provided with an axial hole for a radially limiting boring rod (7-2), and comprises an end bracket (7-5); The boring bar (7-2) is a horizontally arranged straight bar, the diameter of which is smaller than the axial holes of the balance beam support (4) and the large pull rod support (5); The tool module comprises a plurality of boring cutters (7-3), wherein the boring cutters (7-3) are detachably mounted on the boring bar (7-2) and correspond one to one with the support mainboards of the holes to be bored; The process of the fine calibration process is as follows: Laying the top platform of the herringbone frame flat and fixed, arranging the power module on one side of the top platform of the herringbone frame, and arranging the end bracket (7-5) on the other side of the top platform of the herringbone frame; One end of the boring rod (7-2) is drivingly connected to the boring power head (7-1) of the power module, and the other end passes through the axial holes of the balance beam support (4) and the large pull rod support (5) in sequence, and is limitedly installed in the axial hole of the end bracket (7-5) so that it can only move linearly along the axial direction; Fix the top platform of the A-frame, the power module and the bottom of the positioning bracket; A pair of boring cutters (7-3) are installed on the boring bar (7-2) beside the main board of the support to be bored. Driven by the boring power head (7-1), each boring cutter (7-3) rotates around the central axis of the boring bar (7-2). The boring bar (7-2) moves horizontally under the drive of the slide. Multiple boring cutters (7-3) are used to complete the overall boring of the balance beam support (4) and the large tie rod support (5), so that the centers of the axial holes of the balance beam support (4) and the large tie rod support (5) are accurately aligned on a straight line.

2. The manufacturing method of the herringbone hinge support structure of a portal crane according to claim 1, characterized in that: Features: The positioning bracket also includes an intermediate bracket, which is arranged between adjacent balance beam supports (4) and large tie rod supports (5). The boring rod (7-2) passes through the axial holes of the support main board and the intermediate bracket in sequence, and the end is installed in the axial hole of the end bracket (7-5). The bottom of the intermediate bracket is fixed on the panel (1-1) of the top platform of the A-frame. After the overall boring is completed, it is removed from the panel.

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