A special milling machine and processing method for tower crane rotary welding post-machining

Abstract

The present invention discloses a special milling machine and processing method for machining after rotary welding of a tower crane, comprising a support base, a slide rail, a power head and a rotary fixing device, wherein a slide table is arranged on the slide rail, the lower end of the rotary fixing device is arranged on the slide rail through the slide table, the upper end of the slide rail is swivel-connected to the rotary fixing device, the upper side of the support base is located at the upper end of the rotary fixing device and is welded and fixed with a power head, and the lower end of the power head is swivel-connected to a milling cutter disc. In the process of rotating the swivel support and driving the workpiece to rotate, the present invention uses the milling cutter disc to mill the machining surface of the workpiece, so that the feed path is circular and can be consistent with the machining surface of the workpiece, so that the workpiece can be processed quickly and efficiently, with high production efficiency and strong pertinence. The present invention solves the problems that the existing milling machine is not pertinent to the machining after rotary welding of the tower crane, the machining accuracy of the milling machine is too rich, the clamping structure is relatively complex, the clamping process is time-consuming and labor-intensive, the labor intensity of the staff is high, and the production efficiency is low.

Description

Technical Field

[0001] The invention belongs to the technical field of mechanical processing, and in particular relates to a special milling machine and a processing method for machining after rotary welding of a tower crane. Background Art

[0002] Milling machine mainly refers to a machine tool that uses a milling cutter to process various surfaces of a workpiece. Usually, the milling cutter mainly moves in rotation, and the movement of the workpiece and the milling cutter is the feed motion. Milling machines are mainly divided into table milling machines, cantilever milling machines, ram milling machines, gantry milling machines, plane milling machines, etc. It is a machine tool with a wide range of uses. It can not only process various planes and grooves, but also process complex surfaces such as curved surfaces and gears. In addition, it can also be used for processing the surface of a rotating body, inner holes, and cutting work. It has good rigidity, high load-bearing capacity, high processing accuracy, and higher efficiency than a planer. It is widely used in machinery manufacturing and repair departments. Among them, the gantry milling machine is mainly used for machining after the rotary welding of tower cranes, but it still has the following disadvantages in actual use:

[0003] 1. The existing milling machines are general-purpose milling machines, which are not very targeted for the processing after the rotary welding of tower cranes. For example, when processing on a gantry milling machine, the feed path is a straight line and the rotary processing surface is a toroidal surface. It takes many straight lines to complete the processing of the surface to be processed, and the number of pauses is large, resulting in low production efficiency;

[0004] 2. Existing milling machines are usually equipped with many finishing functions to meet the processing of various precision workpieces, but these functions are not needed when processing tower crane rotary weldments. For example, the large-size lifting of the power head requires too much machining accuracy, resulting in high initial investment in the equipment and low cost performance;

[0005] 3. The clamping structure of the existing milling machine cannot be well adapted to the tower crane rotary weldment. The clamping structure is relatively complex and the clamping process is time-consuming and labor-intensive, resulting in greater labor intensity for the workers and reduced production speed.

[0006] Therefore, the existing special milling machine used for tower crane rotary welding and post-machining cannot meet the needs of actual use, so there is an urgent need for improved technology on the market to solve the above problems. Summary of the invention

[0007] The purpose of the present invention is to provide a special milling machine for tower crane rotary welding post-machining. Through a supporting base, a slide rail, a power head and a rotary fixing device, the present invention solves the problems that the existing milling machine is not very targeted for tower crane rotary welding post-machining, the milling machine has too rich machining accuracy, resulting in high initial investment in equipment, a relatively complex clamping structure, a time-consuming and labor-intensive clamping process, a high labor intensity for staff, and low production efficiency.

[0008] In order to solve the above technical problems, the present invention is achieved through the following technical solutions:

[0009] The invention relates to a special milling machine for machining after rotary welding of a tower crane, comprising a supporting base, a slide rail, a power head and a rotary fixing device, wherein the slide rail is welded and fixed on the upper side of the supporting base, a slide table is arranged on the slide rail, and the lower end of the rotary fixing device is arranged on the slide rail through the slide table. The upper end of the slide rail is screwed to the rotary fixing device, and the feeding path of the present invention can be circular during machining, which is consistent with the annular surface of the machining surface of the workpiece, and all the machining surfaces are machined after one circle, so that the production efficiency is doubled and the pertinence is strong.

[0010] Furthermore, a frame is provided on the side of one end of the support base, and the frame has a vertical support part and a horizontal support part. The lower end of the vertical support part of the frame is provided on the side of one end of the support base, and the horizontal support part of the frame extends along the arc-shaped transition of the upper end of the vertical support part to the top of the slide. A power head is provided on the horizontal support part of the frame, and the upper end of the power head is provided on the horizontal support part of the frame, and the lower end of the power head is perpendicular to the upper surface of the support base. The slide rail is located at the other end of the support base, and the support base is firmly installed on the reinforced concrete foundation to ensure that the present invention is on a horizontal plane and improve the processing accuracy.

[0011] Furthermore, the slide is clamped on the upper side of the slide rail, the upper surface of the support plate is perpendicular to the power head on the horizontal support part of the frame, and the main axis of the power head is perpendicular to the upper surface of the support plate. The slide can realize the left and right movement of the workpiece through the slide rail, which is convenient for the power head to process the workpiece, reduces the labor intensity of the staff, and improves the processing speed.

[0012] Furthermore, a slewing bearing is provided on the slide, and a plurality of slewing fixing devices are arranged at intervals along the upper surface edge of the slewing bearing, and the lower surface of the slewing fixing device is screwed and fixed to the upper surface edge of the slewing bearing.

[0013] Furthermore, a slewing drive mechanism is rotatably fixed to one end of the slewing bearing, and an output shaft of the slewing drive mechanism is transmission-connected to the slewing bearing via a driving gear.

[0014] Furthermore, a support plate is fixed on the outer side of the slide below the slewing bearing, a support frame is arranged on the lower surface of the end of the support plate, the support frame is welded and fixed to the lower surface of the support plate, and the slewing drive mechanism is arranged on the upper end of the support frame. The slewing fixing device realizes a circular feed path through the slewing drive mechanism, which can match the processing surface of the workpiece, so that the workpiece can be processed quickly and efficiently, with high production efficiency and strong pertinence.

[0015] Furthermore, clamping assemblies for fixing the workpiece are respectively provided on the rotary fixing devices, and the clamping assemblies are welded and fixed at the center of the upper end of the rotary fixing devices. The workpiece is screwed and fixed on the upper side of the rotary fixing devices. The edge of the workpiece can be fixed by the rotary fixing devices, and the clamping assemblies can further clamp the workpiece, thereby achieving stability of the workpiece during processing, simple operation, and strong targeting.

[0016] The present invention has the following beneficial effects:

[0017] 1. The present invention solves the problem that the existing milling machine is a general milling machine and is not very targeted for the post-rotation welding processing of the tower crane by arranging a rotary fixing device. For example, when a gantry milling machine is processing, the feed path is a straight line and the rotary processing surface is an annular surface. It takes many straight lines to complete the processing of the surface to be processed, and the number of pauses is large, resulting in low production efficiency. The feed path of the rotary fixing device is circular, which coincides with the annular surface of the processing surface of the workpiece. After completing a circle, all processing surfaces are processed, and the production efficiency is doubled.

[0018] 2. The present invention solves the problem that the existing milling machines are usually equipped with many finishing functions to meet the processing of various precision workpieces, while these functions are not needed when processing tower crane rotary weldments, such as the large-size lifting of the power head and the excessive processing accuracy, which leads to high initial investment in equipment and low cost performance by arranging a supporting base, a slide rail, a power head and a rotary fixing device. The present invention has a simple structure, low cost, and strong targeted operation, which can greatly reduce the initial investment in equipment and has a high cost performance.

[0019] 3. The present invention solves the problem that the clamping structure of the existing milling machine cannot be well adapted to the rotary weldment of the tower crane, the clamping structure is relatively complex, and the clamping process is time-consuming and labor-intensive, resulting in high labor intensity for the workers and reduced production speed by providing a rotary fixing device. The rotary fixing device and the clamping assembly can clamp the edge and center of the workpiece at the same time, thereby improving the stability of the workpiece during processing, improving the processing accuracy, and ensuring the quality of the workpiece after processing.

[0020] Of course, any product implementing the present invention does not necessarily need to achieve all of the advantages described above at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for describing the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0022] Figure 1 It is a front view of the present invention;

[0023] Figure 2 is a side view of the present invention;

[0024] Figure 3 A top view of the present invention;

[0025] Figure 4 It is a structural diagram of the support base and the slide rail of the present invention.

[0026] In the accompanying drawings, the components represented by the reference numerals are listed as follows:

[0027] 1. Support base; 101. Frame; 2. Slide rail; 201. Slide table; 202. Support plate; 3. Power head; 301. Milling cutter disc; 4. Rotary fixing device; 401. Rotary bearing; 402. Clamping assembly; 403. Rotary drive mechanism; 403a. Drive gear; 404. Support frame; 5. Workpiece. DETAILED DESCRIPTION

[0028] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0029] See also Figure 1-4 As shown, the present invention is a special milling machine for machining after rotary welding of a tower crane, comprising a supporting base 1, a slide rail 2, a power head 3 and a rotary fixing device 4. The slide rail 2 is welded and fixed on the upper side of the supporting base 1, and a slide table 201 is arranged on the slide rail 2. The lower end of the rotary fixing device 4 is arranged on the slide rail 2 through the slide table 201, and the upper end of the slide table 201 is screwed to the rotary fixing device 4. The power head 3 is welded and arranged on the upper end of the rotary fixing device 4 on the upper side of the supporting base 1, and a milling cutter disc 301 is screwed on the lower end of the power head 3. The workpiece can be quickly milled by the milling cutter disc, and the up and down displacement of the milling cutter disc by the power head is suitable for processing the workpiece, and there is no need to adjust the up and down distance. It has strong pertinence and high production efficiency. The rotary fixing device 4 can make the feed path circular during processing of the present invention, which is consistent with the annular surface of the processing surface of the workpiece 5. After completing a circle, all processing surfaces are processed. The upper side of the support base 1 is located at the upper end of the rotary fixing device 4 and is welded and fixed with a power head 3, which can mill the processing surface of the workpiece 5.

[0030] Among them Figure 1 , 4 As shown, a frame 101 is arranged on the side of one end of the support base 1, and the frame (101) has a vertical support part and a horizontal support part. The lower end of the vertical support part of the frame 101 is arranged on the side of one end of the support base 1, and the horizontal support part of the frame 101 is extended to the top of the slide 201 along the arc-shaped upper end of the vertical support part. A power head 3 is arranged on the horizontal support part of the frame 101, and the upper end of the power head 3 is arranged on the horizontal support part of the frame 101. The lower end of the power head 3 is perpendicular to the upper surface of the support base 1, and the slide rail 2 is located at the other end of the support base 1 (relative to one end of the frame 101). The support base 1 is firmly installed on the reinforced concrete foundation, and the left and right movement of the workpiece 5 can be realized by the slide rail 2, which is convenient for the power head 3 to process the workpiece 5. The up and down displacement of the milling cutter disc 301 by the power head 3 is suitable for processing the workpiece 5, and the workpiece 5 can be quickly milled by the milling cutter disc 301.

[0031] Among them Figure 2-3 As shown, the slide 201 is clamped on the upper side of the slide rail 2, the upper surface of the slide 201 is perpendicular to the power head 3 on the horizontal support part of the frame 101, and the main axis of the power head 3 is perpendicular to the plane where the slide 201 and the support base 1 are located, ensuring that the milling cutter disc 301 is parallel to the workpiece 5 when it rotates in the horizontal plane. A slewing bearing 401 is provided on the slide 201, and a plurality of slewing fixing devices 4 are arranged at intervals along the upper surface edge of the slewing bearing 401. During the sliding process of the slide 201, the slewing bearing 401 is driven to slide close to the milling cutter disc 301 and fixed to mill the workpiece 5. Multiple straight line processing of the surface to be processed can be performed, so that the workpiece is stable during processing, the operation is simple and targeted, and the lower surface of the slewing fixing device 4 is rotated Fixed on the upper surface edge of the slewing bearing 401, a slewing driving mechanism 403 is rotatably fixed at one end of the slewing bearing 401, and the output shaft of the slewing driving mechanism 403 is transmission-connected with the slewing bearing 401 through a driving gear 403a, a support plate 202 is fixed on the outer side of the slide 201 below the slewing bearing 401, and a support frame 404 is arranged on the lower surface of the end of the support plate 202, and the support frame 404 is welded and fixed to the lower surface of the support plate 202, and the slewing driving mechanism 403 is arranged on the upper end of the support frame 404, and the slewing bearing 401 is driven to rotate by the slewing driving mechanism 403, and the slewing bearing 401 drives the slewing fixing device 4 to rotate, so that the feeding path is circular and can coincide with the processing surface of the workpiece 5.

[0032] Among them Figure 2As shown, clamping assemblies 402 for fixing the workpiece 5 are respectively provided on the rotary fixing device 4, and the clamping assembly 402 is welded and fixed at the center of the upper end of the rotary fixing device 4. The workpiece 5 is screwed and fixed on the upper side of the rotary fixing device 4, and the clamping assembly 402 is screwed and fixed to the center of the lower side of the workpiece 5. The edge of the workpiece 5 can be fixed by the rotary fixing device 4, and the clamping assembly 402 can further clamp the center of the workpiece 5 to achieve stability of the workpiece 5 during processing.

[0033] In the present invention, a milling processing method using a special milling machine for tower crane rotary welding post-machining of the present invention comprises the following steps: installing various components, firmly installing the support base (1) on the foundation, fixing the slide 201 and the slide rail 2 to the support base 1, installing the rotary fixing device 4 on the rotary support 401, installing the frame 101 at one end of the support base 1, and making the power head 3 on the horizontal support part of the frame 101 downwardly perpendicular to the surface of the rotary support 401; debugging various components, starting the rotary drive mechanism 403, and rotating it forward and backward by one circle, and making the slide 201 reciprocate once on the slide rail 2, starting the power head 3 to move up and down once, and driving the milling cutter disc 301 to rotate for 30 seconds; adjusting the installation processing The workpiece 5 is clamped on the clamping assembly 402 of the rotary fixture 4; the rotary fixture 4 is tested, the rotary drive mechanism 403 drives the rotary fixture 4 to rotate one circle in each direction, the slide rail 2 is tested, the slide 201 goes back and forth once on the upper side of the slide rail 2, the power head 3 is tested, the milling cutter disc 301 moves up and down once, and rotates for 30 seconds. After the partial test runs are normal, the workpiece 5 is hoisted to the upper side of the rotary fixture 4, the relevant positions are adjusted, and the workpiece 5 is clamped and fixed by the rotary fixture 4 and the clamping assembly 402 to achieve the stability of the workpiece 5 during processing, simple operation, strong pertinence, start the slide 201 to move to the corresponding position, 20-40mm horizontally away from the milling cutter disc 301, pause the operation, and make The milling cutter disc 301 extends downward by a corresponding length to meet the initial milling amount, and the milling cutter disc 301 is started to rotate, and the rotation speed of the milling cutter disc 301 is not less than 300rpm; milling the workpiece 5, start the slide rail 2 and move it to the milling through-ring surface of the workpiece 5, the feed speed of the slide rail 2 is 1mm-3mm / s, so that the center of the milling cutter disc 301 is on the midline between the inner and outer rings of the ring surface of the workpiece 5, lock the slide 201, start the rotary drive mechanism 403 to drive the slewing bearing 401 to rotate, the speed of the driving slewing bearing 401 is less than the speed of the milling cutter disc 301, and drive the workpiece 5 on the rotary fixing device 4 to perform ring surface milling during the rotation process, and the feed path is circular through the rotary drive mechanism 403, which can be aligned with the workpiece 5, so that the workpiece 5 can be processed quickly and efficiently, with high production efficiency and strong pertinence; after the annular milling of the workpiece 5 is completed, the rotary drive mechanism 403 stops running, the milling cutter disc 301 stops rotating and retracts, and the slide rail 2 returns to its original position; the rotary fixing device 4 and the clamping assembly 402 are loosened, and the milled workpiece 5 is hoisted out to prepare for the next working cycle. Compared with the general milling machine, the present invention has a simple structure, strong pertinence, and low equipment cost, which can greatly reduce the initial investment in equipment and has a high cost performance; it solves the problems that the existing milling machine is not pertinent to the post-rotation welding processing of the tower crane, the milling machine processing accuracy is too rich, the clamping structure is relatively complex, the clamping process is time-consuming and labor-intensive, the labor intensity of the staff is high, and the production efficiency is low.

[0034] The above are only preferred embodiments of the present invention and do not limit the present invention. Any modification to the technical solutions recorded in the aforementioned embodiments, any equivalent replacement of some of the technical features therein, and any modification, equivalent replacement, and improvement made are all within the protection scope of the present invention.

Claims

1. A processing method of a special milling machine for machining after rotary welding of a tower crane, characterized in that: The special milling machine comprises a support base (1), a slide rail (2), a power head (3) and a rotary fixing device (4); the slide rail (2) is welded and fixed on the upper side of the support base (1); a slide table (201) is arranged on the slide rail (2); the lower end of the rotary fixing device (4) is arranged on the slide rail (2) through the slide table (201); the upper end of the slide table (201) is screwed to the rotary fixing device (4); the power head (3) is welded and arranged on the upper end of the rotary fixing device (4) on the upper side of the support base (1); and a milling cutter disc (301) is screwed to the lower end of the power head (3); A frame (101) is arranged on the side of one end of the support base (1), and the frame (101) has a vertical support portion and a horizontal support portion. The lower end of the vertical support portion of the frame (101) is arranged on the side of one end of the support base (1), and the horizontal support portion of the frame (101) extends along the arc-shaped transition of the upper end of the vertical support portion to above the slide table (201). A power head (3) is arranged on the horizontal support portion of the frame (101), and the upper end of the power head (3) is arranged on the horizontal support portion of the frame (101). The lower end is perpendicular to the upper surface of the support base (1), and the slide rail (2) is located at the other end of the support base (1); the slide table (201) is clamped on the upper side of the slide rail (2), and the surface of the slide table (201) is perpendicular to the power head (3) on the horizontal support part of the frame (101); a slewing bearing (401) is provided on the slide table (201), and a plurality of slewing fixing devices (4) are arranged at intervals along the upper surface edge of the slewing bearing (401), and the lower surface of the slewing fixing device (4) is screwed and fixed to the upper surface edge of the slewing bearing (401); A rotary drive mechanism (403) is rotatably fixed at one end of the rotary support (401), and an output shaft of the rotary drive mechanism (403) is transmission-connected to the rotary support (401) via a driving gear (403a); a support plate (202) is fixed to the outside of the slide table (201) below the rotary support (401), a support frame (404) is provided on the lower surface of the end of the support plate (202), the support frame (404) is welded and fixed to the lower surface of the support plate (202), the rotary drive mechanism (403) is provided at the upper end of the support frame (404), and clamping components (402) to which a workpiece (5) is fixed are respectively provided on the rotary fixing device (4); Among them, the processing method of the special milling machine includes the following steps: Step 1, installing the various components, firmly installing the support base (1) on the foundation, fixing the slide (201), the slide rail (2) and the support base (1), installing the slewing fixing device (4) on the slewing bearing (401), installing the frame (101) on one end of the support base (1), and making the power head (3) on the horizontal support part of the frame (101) downwardly perpendicular to the surface of the slewing bearing (401); Step 2, debugging each component, starting the rotary drive mechanism (403), and rotating it one circle forward and backward, and making the slide (201) move back and forth once on the slide rail (2), starting the power head (3) to move up and down once, and driving the milling cutter disc (301) to rotate for 30 seconds; Step 3, adjust and install the workpiece (5) to be processed, clamp the workpiece (5) on the clamping assembly (402) of the rotary fixture (4), start the slide (201) to move to the corresponding position, 20-40 mm horizontally away from the milling cutter disc (301), pause the operation, make the milling cutter disc (301) extend downward by a corresponding length to meet the first pass milling amount, and start the milling cutter disc (301) to rotate: Step 4, milling the workpiece (5), starting the slide rail (2) and moving it to the milling through-ring surface of the workpiece (5), so that the center of the milling cutter disc (301) is on the center line between the inner and outer rings of the ring surface of the workpiece (5), locking the slide table (201), starting the rotary drive mechanism (403) to drive the rotary bearing (401) to rotate, and driving the workpiece (5) on the rotary fixing device (4) to perform ring surface milling during the rotation process; Step 5, after the toroidal milling of the workpiece (5) is completed, the rotary drive mechanism (403) stops, the milling cutter disc (301) stops rotating and retracts the slide rail (2) back to its original position; the clamping assembly (402) is released, and the milled workpiece (5) is lifted out to prepare for the next working cycle.

2. The processing method according to claim 1, characterized in that: In step 4, the slide rail (2) is started and moved to the milling through-ring surface of the workpiece (5), and the feed speed of the slide rail (2) is 1 mm-3 mm / s.

3. The processing method according to claim 1, characterized in that: The rotation speed of the milling cutter disc (301) is not less than 300 rpm, and the rotation speed of the driving slewing bearing (401) is less than the speed of the milling cutter disc (301).

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