Precision machining system for bridge steel tower

Abstract

The invention relates to a precise machining system for a bridge steel tower. The precise machining system is characterized by comprising a lathe bed, a stand column, a sliding table and a lifting platform; the lathe bed and the stand column are made of iron castings subjected to multiple heat treatment procedures, the structure is stable, a spindle is driven by an alternating-current servo motor to rotate, high-speed and low-speed output is achieved through electrical speed change, and a light cutting face milling cutter disc which is good in rigidity and high in strength and is used for heavy-load rough machining is selected. The feeding transmission of each shaft adopts an advanced double-motor double-speed reducer gear driving mode, and a servo motor is provided with a brake to eliminate the backlash of a gear and a rack in the driving process, so that the gapless transmission is realized; protection structures are arranged on the machine body and the stand column, and meanwhile, a transmission gear, a rack and a lead screw of the machine tool are clean; the lifting platform is adopted as a centralized operation area, so that the part machining condition is convenient to operate and observe.

Description

Technical Field

[0001] The invention relates to the technical field of bridge construction, and in particular to a precision machining system for a bridge steel tower. Background Art

[0002] Extra-large steel structure bridge steel towers have excellent seismic performance, light weight, and fast construction speed, making them the preferred choice for some bridge designs at home and abroad. As a compression-bending member that mainly bears pressure, the end surface flatness, roughness, and contact rate of the steel tower are the key nodes for the precision control of steel tower manufacturing, and the steel tower end surface processing machine tool is the key equipment for the precision control of steel towers. If the manufacturing accuracy of the steel tower needs to be guaranteed, the manufacturer must have the end surface processing capability, and the domestic standard machine tool generally has a processing height of 8 meters, while the current equipment in the factory has a height of 6 meters and a length of 12 meters, which cannot meet the processing requirements of bridge steel towers. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide a bridge steel tower precision machining system, which can solve the problem that the machining height and range of general standard machine tools cannot meet the requirements of bridge steel tower machining.

[0004] In order to solve the above technical problems, the technical solution of the present invention is: a bridge steel tower precision machining system, the innovation of which is: comprising a bed, a column, a slide and a lifting platform; The bed is fixedly installed in the concrete layer by anchor screws, and concrete is poured above the anchor screws in the circumferential direction of the bed; an X-guide rail is arranged on the upper surface of the bed along the extension direction, and a pair of slides cooperating with the X-guide rail are arranged on the X-guide rail to achieve an X-axis reciprocating motion distance of 20 meters; The column has a pair, the column is arranged perpendicular to the upper surface of the bed and the bottom end of the column is correspondingly mounted on the slide; a retractable bed protection cover buckled on the guide rail is arranged on one side of the column, and the bed protection cover moves back and forth along the extension direction of the X guide rail following the column; a Y guide rail is arranged on the column along the vertical direction to achieve a Y-axis reciprocating motion distance of 12 meters; The lifting platform is installed on the Y guide rail through a slider, and an electrical box, a control station, a lifting operation room, a Z-direction feed spindle box and a lifting platform counterweight are provided on the lifting platform; the electrical box, the control station and the lifting operation room are all modular structures and are used to provide power source and motion control; a milling cutter spindle is provided on the Z-direction feed spindle box, and the milling cutter spindle is driven by an AC servo motor; a milling cutter disc is installed on the milling cutter spindle, and a blade is clamped on the milling cutter disc, and the lifting platform counterweight is arranged in the column and connected to the lifting platform.

[0005] Furthermore, a column guard is provided on the column; the bed, column and slide are all cast iron parts, and are all subjected to several heat treatment processes to eliminate internal stress and stabilize the internal structure.

[0006] Furthermore, the milling cutter spindle is clamped by a disc spring and released by pneumatic and hydraulic methods, and is automatically purged by compressed air after the cutter is released.

[0007] Furthermore, the movement of the column in the X-guide direction and the movement of the lifting platform in the Y-guide direction both adopt an advanced dual-motor dual-reducer gear drive method, and the servo motor is equipped with a brake to eliminate the side clearance of the gears and racks in the drive, realize gapless transmission, and ensure stable and reliable positioning of the Z-feed spindle box during processing; the feeding of the Z-feed spindle box is achieved by driving the ball screw with a servo motor and a reducer.

[0008] Furthermore, the X-guide rail and the Y-guide rail are both heavy-load roller linear guides.

[0009] Furthermore, the main cutting edge angle of the blade is 45 degrees and the cutting edge length is 1.5 mm.

[0010] The advantages of the present invention are: 1) In the present invention, the bed and the column are made of cast iron parts that have undergone multiple heat treatment processes, with a stable structure. The main shaft rotation is driven by an AC servo motor, and electrical speed change is used to achieve high and low speed output. A light-cutting face milling cutter with good rigidity and high strength for heavy-load rough machining is selected; the feed transmission of each axis adopts an advanced dual-motor dual-reducer gear drive mode, and the servo motor is equipped with a brake to eliminate the side clearance of the gear and rack in the drive and realize gapless transmission; protective structures are set on the bed and the column, and at the same time, the machine tool transmission gear, rack, and lead screw are kept clean; a lifting platform is used as a centralized operating area to facilitate operation and observation of part processing; steel tower components are placed on both sides of the machine tool, and synchronous processing of the machine tool can ensure the flatness and parallelism of the components (within the range of 20*12 meters). BRIEF DESCRIPTION OF THE DRAWINGS

[0011] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0012] Figure 1 It is a front view of a bridge steel tower precision machining system of the present invention.

[0013] Figure 2 It is a side view of a bridge steel tower precision machining system of the present invention.

[0014] Figure 3 The figure is a top view of a precision machining system for a bridge steel tower according to the present invention.

[0015] Figure 4This is a partial structural diagram of a bridge steel tower precision machining system of the present invention. DETAILED DESCRIPTION

[0016] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0017] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0018] like Figures 1 to 4 A bridge steel tower precision machining system shown includes a bed 1, a column 2, a slide 3 and a lifting platform 4.

[0019] The bed 1 is fixed in the concrete layer by anchor screws, and concrete is poured in the circumferential direction of the bed above the anchor screws; an X-guide rail is arranged on the upper surface of the bed along the extension direction, and a pair of slides cooperating with the X-guide rail are arranged on the X-guide rail, realizing an X-axis reciprocating motion distance of 20 meters.

[0020] There is a pair of columns 2, which are arranged perpendicular to the upper surface of the bed 1 and the bottom ends of the columns are correspondingly installed on the slide 3; a retractable bed protection cover buckled on the guide rail is arranged on one side of the column 2, and the bed protection cover moves back and forth along the extension direction of the X-guide rail following the column; a Y-guide rail is arranged on the column 2 along the vertical direction to achieve a Y-axis reciprocating motion distance of 12 meters.

[0021] The lifting platform 4 is installed on the Y guide rail through a slider, and an electrical box 41, a control station 42, a lifting operation room 43, a Z-direction feed spindle box 44 and a lifting platform counterweight 45 are provided on the lifting platform 4; the electrical box 41, the control station 42 and the lifting operation room 43 are all modular structures and are used to provide power source and motion control; a milling cutter spindle is provided on the Z-direction feed spindle box 44, and the milling cutter spindle is driven by an AC servo motor; a milling cutter disc is installed on the milling cutter spindle, and a blade is clamped on the milling cutter disc, and the lifting platform counterweight 45 is arranged in the column and connected to the lifting platform.

[0022] A column guard is provided on the column 2; the bed 1, the column 2 and the slide 3 are all cast iron parts, and all of them have undergone several heat treatment processes to eliminate internal stress and stabilize the internal structure.

[0023] The milling cutter spindle is clamped by disc spring and released by pneumatic and hydraulic methods. After the cutter is released, it is automatically purged by compressed air.

[0024] The movement of the column 2 in the X-guide direction and the movement of the lifting platform 4 in the Y-guide direction both adopt advanced dual-motor dual-reducer gear drive mode. The servo motor is equipped with a brake to eliminate the side clearance of the gear and rack in the drive, realize gapless transmission, and ensure stable and reliable positioning of the Z-feed spindle box during processing; the feeding of the Z-feed spindle box is achieved by driving the ball screw with a servo motor and a reducer.

[0025] Both the X and Y guide rails are heavy-duty roller linear guides.

[0026] The main cutting edge angle of the blade is 45 degrees and the cutting edge length is 1.5mm.

[0027] The working principle of the present invention is: the bed and the column are made of cast iron parts that have undergone multiple heat treatment processes, with a stable structure, the main shaft rotation is driven by an AC servo motor, and electrical speed change is used to achieve high and low speed output, and a light cutting face milling cutter disc with good rigidity and high strength for heavy-load rough processing is selected; the feed transmission of each axis adopts an advanced dual-motor dual-reducer gear drive method, and the servo motor is equipped with a brake to eliminate the side clearance of the gear and rack in the drive and realize gapless transmission; protective structures are set on the bed and the column, and at the same time, the machine tool transmission gear, rack, and lead screw are kept clean; a lifting platform is used as a centralized operating area to facilitate operation and observation of part processing.

[0028] Those skilled in the art should understand that the present invention is not limited to the above-mentioned embodiments. The above-mentioned 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 be subject to various changes and improvements, and these changes and improvements shall all fall within the scope of the present invention claimed for protection.

Claims

1. A bridge steel tower precision machining system, characterized by: Including bed, column, slide and lifting platform; The bed is fixedly installed in the concrete layer by anchor screws, and concrete is poured above the anchor screws in the circumferential direction of the bed; an X-guide rail is arranged on the upper surface of the bed along the extension direction, and a pair of slides cooperating with the X-guide rail are arranged on the X-guide rail; the X-axis reciprocating motion distance is realized to be 20 meters; The column has a pair, the column is arranged perpendicular to the upper surface of the bed and the bottom end of the column is correspondingly mounted on the slide; a retractable bed protection cover buckled on the guide rail is arranged on one side of the column, and the bed protection cover moves back and forth along the extension direction of the X guide rail following the column; a Y guide rail is arranged on the column along the vertical direction to achieve a Y-axis reciprocating motion distance of 12 meters; The lifting platform is installed on the Y-direction guide rail through a slider, and the lifting platform is provided with an electrical box, a control station, a lifting operation room, a Z-direction feed spindle box and a lifting platform counterweight; The electrical box, control station and lifting operation room are all modular structures and are used to provide power source and motion control; the Z-axis feed spindle box is provided with a milling cutter spindle, and the milling cutter spindle is driven by an AC servo motor; a milling cutter disc is installed on the milling cutter spindle, and a blade is clamped on the milling cutter disc; the lifting platform counterweight is arranged in the column and is connected to the lifting platform.

2. A bridge steel tower precision machining system according to claim 1, characterized in that: The column is provided with a column shield; the bed, column and slide are all cast iron parts, and are all subjected to several heat treatment processes to eliminate internal stress and stabilize the internal structure.

3. A bridge steel tower precision machining system according to claim 1, characterized in that: The milling cutter spindle is clamped by a disc spring and released by pneumatic and hydraulic methods. After the cutter is released, it is automatically purged by compressed air.

4. A bridge steel tower precision machining system according to claim 1, characterized in that: The movement of the column in the X-guide direction and the movement of the lifting platform in the Y-guide direction both adopt advanced dual-motor dual-reducer gear drive mode, and the servo motor is equipped with a brake to eliminate the side clearance of the gear and rack in the drive, realize gapless transmission, and ensure stable and reliable positioning of the Z-feed spindle box during processing; the feeding of the Z-feed spindle box is achieved by driving the ball screw with a servo motor and a reducer.

5. The bridge steel tower precision machining system according to claim 1, characterized in that: The X-guide rail and the Y-guide rail are both heavy-duty roller linear guide rails.

6. A bridge steel tower precision machining system according to claim 1, characterized in that: The main cutting edge angle of the blade is 45 degrees and the cutting edge length is 1.5 mm.

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