Variable cross-section steel column manufacturing device

Abstract

The application relates to a variable cross-section steel column manufacturing device, which belongs to the field of steel column processing. The variable cross-section steel column manufacturing device comprises a track, a plurality of column body support frames slidably arranged on the track, two column end support frames and two end plate support frames, the column body support frame is connected with a rotatable first rotating disc, the first rotating disc is provided with a first through hole for the steel column to pass through, two horizontal rods and two vertical rods symmetrically arranged on both sides of the center of the first rotating disc, the two horizontal rods and the two vertical rods can synchronously move towards each other or away from each other, the two column end support frames are connected with a rotatable second rotating disc, the second rotating disc is provided with a second through hole for the steel column to pass through and a plurality of first screw rods which can be moved to press or loosen the outer wall of the steel column passing through the second through hole, and the end plate support frame is connected with a rotatable third rotating disc, the third rotating disc is provided with a limiting groove and a plurality of second screw rods which can be moved to press or loosen the end plate of the steel column in the limiting groove. The variable cross-section steel column manufacturing device can guarantee the accurate centering and positioning of the variable cross-section steel column processing.

Description

Technical Field

[0001] This application relates to the field of steel column processing, and more specifically, to a variable cross-section steel column manufacturing apparatus. Background Technology

[0002] In recent years, elevated rail trains have been vigorously developed as a new type of urban rail transit. When elevated rail trains are in operation, steel columns are required to support the tracks. Due to the influence of actual terrain, design requirements, and manufacturing and installation reasons, the design precision, welding quality, appearance requirements and elevation dimensions of each steel column are different, which puts forward high requirements for the manufacturing of steel columns.

[0003] To ensure the smoothness and safety of the elevated rail train operation, the dimensions of each steel column must be controlled within the design elevation tolerance range after manufacturing. However, due to the actual terrain, the elevation dimensions of different steel columns are almost always different. Currently, when manufacturing complex variable cross-section steel columns, workers can only build a very simple and fixed-size device based on the column dimensions. However, this device cannot be quickly adjusted according to different elevation dimensions, requiring repeated positioning and measurement. Furthermore, new devices need to be built for steel columns of different dimensions. Simultaneously, during the welding of internal stiffening ribs and diaphragms, to ensure weld quality and facilitate welding, the steel column needs to be rotated multiple times using an overhead crane. However, this process causes changes in the column's position, requiring remeasurement and reducing processing efficiency. When connecting variable cross-section steel columns with constant cross-section steel columns, to ensure axial alignment, new devices need to be built to guarantee accuracy, increasing processing costs. During the installation of steel columns, the actual embedded parts in the concrete pouring deviated from the design, causing the bottom plate and the column body to become eccentric. Furthermore, the bottom plate and the column body had to be adjusted based on the deviation measured on site, making the adjustment difficult and requiring the design of corresponding devices to ensure accuracy. This resulted in low production efficiency, difficulty in ensuring accuracy, and wasted resources. Summary of the Invention

[0004] The purpose of this application is to provide a variable cross-section steel column manufacturing device, which can ensure accurate centering and positioning during the processing of variable cross-section steel columns, and can avoid changes in positioning that affect the processing when the steel column is flipped.

[0005] The embodiments of this application are implemented as follows:

[0006] This application provides a variable cross-section steel column manufacturing apparatus, which includes:

[0007] track;

[0008] Multiple column support frames are slidably mounted on a track. Each column support frame is connected to a rotatable first turntable and a first drive assembly for driving the first turntable to rotate. The first turntable has a first through hole for the steel column to pass through. The first turntable is also connected to two parallel horizontal bars and two parallel vertical bars, with the horizontal bars perpendicular to the vertical bars. The two horizontal bars and two vertical bars are symmetrically arranged on both sides of the center of the first turntable and are configured to move synchronously towards or away from each other.

[0009] Two column end support frames are slidably mounted on a track and located at both ends of each column body support frame. The column end support frames are connected to a rotatable second turntable and a second drive assembly for driving the second turntable to rotate. The second turntable has a second through hole for the steel column to pass through. The second turntable is also connected to a plurality of first screws by threads. The first screws are configured to move along their axial direction when rotating to press against or loosen the outer wall of the steel column passing through the second through hole.

[0010] Two end plate support frames are slidably mounted on a track and located at both ends of two column end support frames. The end plate support frames are connected to a rotatable third turntable and a third drive assembly for driving the third turntable to rotate. The third turntable is provided with a limiting groove for accommodating the steel column end plate. The third turntable is also connected to a plurality of second screws by threads. The second screws are configured to move along their axial direction when rotating to press against or release the outer wall of the steel column end plate located in the limiting groove.

[0011] The first, second, and third turntables are arranged along a common axis, with the axis extending along the length of the track.

[0012] In some alternative implementations, the first drive assembly, the second drive assembly, and the third drive assembly all include an arc-shaped rack and a corresponding drive motor, with the output shaft of the drive motor connected to a drive gear that meshes with the corresponding rack.

[0013] In some alternative embodiments, the first turntable is connected to two rotatable transverse sleeves and two rotatable longitudinal sleeves. The two transverse sleeves are arranged in parallel and perpendicular to the two parallel longitudinal sleeves. The two transverse sleeves and the two longitudinal sleeves are symmetrically arranged on both sides of the center of the first turntable. The two ends of the transverse sleeves and the two longitudinal sleeves are respectively provided with external threads in opposite directions. The two ends of the two crossbars are respectively threaded onto the two ends of the two transverse sleeves, and the two ends of the two longitudinal bars are respectively threaded onto the two ends of the two longitudinal sleeves.

[0014] In some alternative implementations, the track includes two parallel slide rails and multiple track supports for supporting the slide rails. The slide rails are provided with multiple positioning pin holes spaced apart along their length. The bottom sides of the column support frame, column end support frame and end plate support frame are respectively provided with sliding grooves that slide with the two slide rails. The bottom sides of the column support frame, column end support frame and end plate support frame are respectively provided with connecting pin holes corresponding to the positioning pin holes. The variable cross-section steel column manufacturing device also includes multiple pins, each pin being configured to move axially to insert into or disengage from a connecting pin hole and a corresponding positioning pin hole.

[0015] In some alternative implementations, the slide rail is further provided with a first scale arranged at intervals along its length, and the bottom of both sides of the column support frame, column end support frame and end plate support frame are respectively provided with a second scale corresponding to the first scale.

[0016] In some alternative implementations, a third through hole is provided on the third turntable, and a grid-shaped stop bar is connected to the third turntable within the third through hole. The stop bar and the inner wall of the third through hole enclose a limiting groove.

[0017] The beneficial effects of this application are as follows: The variable cross-section steel column manufacturing device provided by this application includes a track and multiple column support frames, two column end support frames, and two end plate support frames slidably mounted on the track. Each column support frame is connected to a rotatable first turntable and a first driving assembly for driving the first turntable to rotate. The first turntable has a first through hole for the steel column to pass through. The first turntable is also connected to two parallel horizontal bars and two parallel vertical bars, with the horizontal bars perpendicular to the vertical bars. The two horizontal bars and two vertical bars are symmetrically arranged on both sides of the center of the first turntable and are configured to move synchronously towards or away from each other. The two column end support frames are located at both ends of each column support frame, and each column end support frame is connected to a rotatable second turntable and a driving assembly for driving the second turntable to rotate. The second drive assembly for rotating the column includes a second turntable with a second through hole for the steel column to pass through. The second turntable is also threadedly connected to multiple first screws, which are configured to move axially during rotation to press against or release the outer wall of the steel column passing through the second through hole. Two end plate support frames are located at opposite ends of two column end support frames. These end plate support frames are connected to a rotatable third turntable and a third drive assembly for driving the third turntable's rotation. The third turntable has a limiting groove for accommodating the steel column end plate. The third turntable is also threadedly connected to multiple second screws, which are configured to move axially during rotation to press against or release the outer wall of the steel column end plate located in the limiting groove. The first, second, and third turntables are arranged coaxially, with the axis extending along the length of the track. The variable cross-section steel column manufacturing apparatus provided in this application ensures accurate centering and positioning during variable cross-section steel column processing and avoids positioning changes that could affect processing when the steel column is flipped. Attached Figure Description

[0018] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the structure of the variable cross-section steel column manufacturing apparatus provided in the embodiments of this application;

[0020] Figure 2 A schematic diagram of the connection between the column support frame and the first turntable in the variable cross-section steel column manufacturing device provided in the embodiments of this application;

[0021] Figure 3 The column end support frame in the variable cross-section steel column manufacturing device provided in this application embodiment; and the structural schematic diagram of the connection between the second turntable;

[0022] Figure 4 A schematic diagram of the connection between an end plate support frame and the corresponding third turntable in the variable cross-section steel column manufacturing device provided in the embodiments of this application;

[0023] Figure 5 This is a schematic diagram showing the connection between another end plate support frame and the corresponding third turntable in the variable cross-section steel column manufacturing device provided in this application embodiment.

[0024] In the diagram: 100, track; 110, slide rail; 120, track support; 130, positioning pin hole; 140, slide groove; 150, connecting pin hole; 160, pin; 170, first graduation; 180, second graduation; 200, column support frame; 210, first turntable; 211, bearing; 220, first through hole; 230, crossbar; 240, longitudinal bar; 250, transverse sleeve; 260, longitudinal sleeve; 270, first rack; 280, first drive motor; 290 300. First drive gear; 310. Column end support frame; 320. Second turntable; 330. Second through hole; 340. First screw; 350. Second rack; 360. Second drive motor; 400. Second drive gear; 410. End plate support frame; 420. Third turntable; 430. Limiting groove; 440. Second screw; 450. Third rack; 460. Third drive motor; 470. Third drive gear; 480. Stop bar; 500. Third through hole; 500. Steel column. Detailed Implementation

[0025] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0026] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0027] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0028] In the description of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this application is in use. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this application. In addition, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0029] Furthermore, terms such as "horizontal," "vertical," and "sag" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal relative to "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0030] In the description of this application, it should also be noted that, unless otherwise expressly specified and limited, the terms "set up," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0031] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature being directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0032] The features and performance of the variable cross-section steel column manufacturing apparatus of this application will be further described in detail below with reference to embodiments.

[0033] like Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5 As shown, this application provides a variable cross-section steel column manufacturing device, which includes a track 100, six column support frames 200, two column end support frames 300 and two end plate support frames 400.

[0034] The column support frame 200 is slidably mounted on the track 100. Each column support frame 200 is connected to a rotatable first turntable 210 and a first drive assembly for driving the first turntable 210 to rotate. The first drive assembly includes an arc-shaped first rack 270 located on the edge of the first turntable 210 and a first drive motor 280 fixed on the column support frame 200. The output shaft of the first drive motor 280 is connected to a first drive gear 290 that meshes with the corresponding first rack 270. The first turntable 210 has a first through hole 220 for the steel column 500 to pass through. The first turntable 210 is connected to two rotatable transverse sleeves 250 and two rotatable longitudinal sleeves 260. The middle parts of the transverse sleeves 250 and the longitudinal sleeves 260 are rotatably connected to the first turntable 210 through two bearings 211, respectively. The two transverse sleeves 250 and the two longitudinal sleeves 260 rotate along the first turntable 210. A turntable 210 is arranged circumferentially alternately, and two transverse sleeves 250 are arranged in parallel and symmetrically on both sides of the center of the first turntable 210. Two longitudinal sleeves 260 are arranged in parallel and symmetrically on both sides of the center of the first turntable 210. The longitudinal sleeves 260 are arranged perpendicular to the transverse sleeves 250. The two ends of the transverse sleeves 250 and the longitudinal sleeves 260 are respectively provided with external threads in opposite directions. The first through hole 220 of the first turntable 210 is also provided with two horizontal bars 230 and two vertical bars 240. The horizontal bars 230 are perpendicular to the vertical bars 240. The two horizontal bars 230 are symmetrically arranged on both sides of the center of the first turntable 210. The two vertical bars 240 are symmetrically arranged on both sides of the center of the first turntable 210. The two ends of the two horizontal bars 230 are respectively threaded onto the two ends of the two transverse sleeves 250. The two ends of the two vertical bars 240 are respectively threaded onto the two ends of the two longitudinal sleeves 260.

[0035] Two column end support frames 300 are slidably mounted on the track 100 and are located at both ends of each column body support frame 200. The column end support frame 300 is connected to a rotatable second turntable 310 and a second drive assembly for driving the second turntable 310 to rotate. The second drive assembly includes an arc-shaped second rack 340 located on the edge of the second turntable 310 and a second drive motor 350 fixed on the column end support frame 300. The output shaft of the second drive motor 350 is connected to a second drive gear 360 that meshes with the corresponding second rack 340. The second turntable 310 has a second through hole 320 for the steel column 500 to pass through. The second turntable 310 is also connected to eight first screws 330 by threads. The eight first screws 330 are divided into four groups. The four groups of first screws 330 are arranged circumferentially around the second turntable 310. When each first screw 330 rotates, it moves axially to press against or release the outer wall of the steel column 500 passing through the second through hole 320.

[0036] Two end plate support frames 400 are slidably mounted on the track 100 and are located at both ends of the two column end support frames 300. Each end plate support frame 400 is connected to a rotatable third turntable 410 and a third drive assembly for driving the third turntable 410 to rotate. The third drive assembly includes an arc-shaped third rack 440 located on the edge of the third turntable 410 and a third drive motor 450 fixed to the end plate support frame 400. The output shaft of the third drive motor 450 is connected to a third drive gear 460 that meshes with the corresponding third rack 440. The third turntable 410 has an opening... A third through hole 480 is provided, and a third turntable 410 is connected to a grid-shaped stop bar 470 located in the third through hole 480. The stop bar 470 and the inner wall of the third through hole 480 enclose a limiting groove 420 for accommodating the end plate of the steel column 500. The third turntable 410 is also connected to eight second screws 430 by threads. The eight second screws 430 are divided into four groups. The four groups of second screws 430 are arranged at intervals along the circumference of the third turntable 410. The second screws 430 are configured to move axially when rotating to press against or release the outer wall of the end plate of the steel column 500 located in the limiting groove 420.

[0037] The first turntable 210, the second turntable 310, and the third turntable 410 are arranged coaxially with their axes extending along the length of the track 100. The track 100 includes two parallel slide rails 110 and eight track supports 120 for supporting the slide rails 110. Eighty positioning pin holes 130 are spaced apart along the length of each slide rail 110. The bottom sides of the column support frame 200, the column end support frame 300, and the end plate support frame 400 are respectively provided with sliding grooves 140 that slide with the two slide rails 110. The bottom sides of the column support frame 200, the column end support frame 300, and the end plate support frame 400 are respectively provided with grooves 140 that slide with the two slide rails 110. The variable cross-section steel column manufacturing device also includes twenty pins 160, each of which is configured to move axially to insert into or dislodge from the connecting pin hole 150 and a corresponding positioning pin hole 130. The slide rail 110 is also provided with first scales 170 arranged at intervals along its length on both sides. Each first scale 170 is located below a positioning pin hole 130. The bottom of both sides of the column support frame 200, the column end support frame 300 and the end plate support frame 400 are respectively provided with second scales 180 corresponding to the first scales 170. Each second scale 180 is located above a connecting pin hole 150.

[0038] The variable cross-section steel column manufacturing apparatus provided in this application includes the following steps when manufacturing variable cross-section steel columns:

[0039] Slide each column support frame 200 and each column end support frame 300 along the two slide rails 110. Use the first scale 170 set on the side of the two slide rails 110 and the second scale 180 set on the bottom of each column support frame 200 and column end support frame 300 respectively for comparison. Move each column support frame 200 and column end support frame 300 along the two slide rails 110 to the preset position, so that the second scale 180 of one column end support frame 300 is located at the 0 scale line of the first scale 170 set on the side of the two slide rails 110. Arrange another column end support frame 300 and each column support frame 200 according to the length of the variable cross section steel column so that the second scale 180 is aligned with the corresponding first scale 170. Then, each pin 160 can be moved axially to insert a connecting pin hole 150 and a corresponding positioning pin hole 130, thereby fixing each column support frame 200 and column end support frame 300 to the two slide rails 110 respectively.

[0040] Two end segments forming the two ends of the variable cross-section steel column are lifted up respectively. One end of each end segment passes through a second through hole 320 on a second turntable 310 of a column end support 300, and the other end of each end segment passes through a first through hole 220 on a first turntable 210 of an adjacent column support 200. At the same time, the eight first screws 330 connected by threads to the second turntable 310 are rotated, so that the eight first screws 330 move axially to press against the outer wall of the two end segments passing through the second through hole 320. One end of each end segment is fixed to the two column end support 300s respectively. Then, the two transverse sleeves 250 and longitudinal sleeves 260 corresponding to the first turntable 210 are rotated, so that the two ends of the transverse rods 230 and longitudinal rods 240 respectively threaded onto the two transverse sleeves 250 and the two longitudinal sleeves 260 move toward each other to fit against the outer wall of the two end segments. The other end of each end segment is fixed to the two column support 200s respectively.

[0041] Next, the middle section of the variable cross-section steel column is lifted, and the two ends of the middle section are respectively passed through the first through holes 220 of the first turntable 210 of the two column support frames 200. Then, the two transverse sleeves 250 and longitudinal sleeves 260 corresponding to the first turntable 210 are rotated, so that the two ends are respectively moved to fit the outer wall of the middle section by the crossbars 230 and longitudinal bars 240 of the two transverse sleeves 250 and the two longitudinal sleeves 260 through the threaded sleeves. The two ends of the middle section are fixed to the two column support frames 200 respectively. Then, the corresponding pins 160 are pulled out, and the two column support frames 200 of the middle section and the end section and the middle section of the end section are fixed along the axial direction respectively. The ends of the two end sections and the middle section are then welded together in sequence.

[0042] Each of the first drive motors 280 and the second drive motors 350 is controlled to drive the corresponding first drive gears 290 and 360 to rotate, thereby driving the first rack 270 and the first turntable 210 to rotate, as well as driving the second rack 340 and the second turntable 310 to rotate. This, in turn, causes the two fixed end segments and the middle segment of the first turntable 210 and the second turntable 310 to rotate synchronously so as to weld the external welds, internal stiffening ribs and partitions of the variable cross-section steel column to obtain the variable cross-section steel column.

[0043] The two end plates at the top and bottom of the variable cross-section steel column are placed in the third through holes 480 of the third turntable 410 of the two end plate support frames 400, respectively, and the two end plates are pressed tightly against the corresponding stop bars 470. Then, the three turntable 410 is rotated through the eight threaded second screws 430, which move axially to press the two end plates in the third through holes 480 for fixation, and the height of the two end plates corresponds to the two end faces of the variable cross-section steel column. Then, the two end plate support frames 400 are slid along the two slide rails 110, so that the two end plate support frames 400 are closer to the fixed variable cross-section steel column. The direction is moved until the two end plates are attached to the two ends of the variable cross-section steel column. Then, the first drive motor 280, the second drive motor 350 and the third drive motor 450 are controlled to drive the corresponding first drive gear 290, the second drive gear 360 and the third drive gear 460 to rotate, thereby driving the first rack 270 and the first turntable 210, the second rack 340 and the second turntable 310 and the third rack 440 and the third turntable 410 to rotate. This, in turn, drives the variable cross-section steel column and the two end plates fixed by the first turntable 210 and the second turntable 310 to rotate to the appropriate position for docking and welding.

[0044] The variable cross-section steel column manufacturing device provided in this application can ensure accurate centering and precise positioning during the processing of variable cross-section steel columns, thereby guaranteeing the various design accuracy requirements of the steel columns and avoiding changes in positioning that may affect processing when the steel columns are flipped. This effectively reduces the labor intensity of operators, improves production efficiency, and saves resources.

[0045] The embodiments described above are some, but not all, of the embodiments of this application. The detailed description of the embodiments of this application is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

Claims

1. A variable cross-section steel column manufacturing device, characterized in that, It includes: track; Multiple column support frames are slidably mounted on the track. Each column support frame is connected to a rotatable first turntable and a first drive assembly for driving the first turntable to rotate. The first turntable has a first through hole for the steel column to pass through. The first turntable is also connected to two parallel horizontal bars and two parallel vertical bars, with the horizontal bars perpendicular to the vertical bars. The two horizontal bars and two vertical bars are symmetrically arranged on both sides of the center of the first turntable and are configured to move synchronously towards or away from each other. The first turntable is connected to two rotatable transverse sleeves and two rotatable longitudinal sleeves. The two transverse sleeves are arranged in parallel and perpendicular to the two parallel longitudinal sleeves. The two transverse sleeves and the two longitudinal sleeves are symmetrically arranged on both sides of the center of the first turntable. The two ends of the transverse sleeves and the two longitudinal sleeves are respectively provided with external threads in opposite directions. The two ends of the two cross rods are respectively threaded onto the two ends of the two transverse sleeves, and the two ends of the two longitudinal rods are respectively threaded onto the two ends of the two longitudinal sleeves. Two column end support frames are slidably mounted on the track and located at both ends of each column body support frame. Each column end support frame is connected to a rotatable second turntable and a second drive assembly for driving the second turntable to rotate. The second turntable has a second through hole for the steel column to pass through. The second turntable is also threadedly connected to a plurality of first screws. The first screws are configured to move along their axial direction when rotating to press against or release the outer wall of the steel column passing through the second through hole. Two end plate support frames are slidably mounted on the track and located at both ends of the two column end support frames. Each end plate support frame is connected to a rotatable third turntable and a third drive assembly for driving the third turntable to rotate. The third turntable is provided with a limiting groove for accommodating the steel column end plate. The third turntable is also threadedly connected to a plurality of second screws. The second screws are configured to move along their axial direction when rotating to press against or release the outer wall of the steel column end plate located in the limiting groove. The first turntable, the second turntable, and the third turntable are arranged coaxially, and the axis extends along the length of the track.

2. The variable cross-section steel column manufacturing device according to claim 1, characterized in that, The first drive assembly, the second drive assembly, and the third drive assembly all include an arc-shaped rack and a corresponding drive motor, and the output shaft of the drive motor is connected to a drive gear that meshes with the corresponding rack.

3. The variable cross-section steel column manufacturing device according to claim 1, characterized in that, The track includes two parallel slide rails and multiple track supports for supporting the slide rails. The slide rails are provided with multiple positioning pin holes spaced apart along their length. The bottom sides of the column support frame, the column end support frame, and the end plate support frame are respectively provided with sliding grooves that slide with the two slide rails. The bottom sides of the column support frame, the column end support frame, and the end plate support frame are respectively provided with connecting pin holes corresponding to the positioning pin holes. The variable cross-section steel column manufacturing device also includes multiple pins. Each pin is configured to move axially to insert into or disengage from the connecting pin hole and a corresponding positioning pin hole.

4. The variable cross-section steel column manufacturing device according to claim 3, characterized in that, The slide rail is also provided with a first scale arranged at intervals along its length, and the bottom of both sides of the column support frame, the column end support frame and the end plate support frame are respectively provided with a second scale corresponding to the first scale.

5. The variable cross-section steel column manufacturing device according to claim 1, characterized in that, The third turntable has a third through hole, and the third turntable is connected to a grid-shaped stop bar located in the third through hole. The stop bar and the inner wall of the third through hole together form the limiting groove.

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