Rotary drawing mechanism for seamless thin-walled tube

Abstract

A rotary drawing mechanism for a seamless thin-walled tube comprises a driving assembly used for driving a tube drawing assembly to move, the tube drawing assembly used for fixing and drawing a pierced billet, and a foreground used for installing the tube drawing assembly and the driving assembly which are arranged in sequence. The driving assembly comprises a chain wheel motor, a chain wheel coupling, a chain wheel speed reducer, a chain wheel shaft, a chain wheel and a sheet chain; the tube drawing assembly comprises a torsion motor, a torsion speed reducer, a torsion coupler, an intermediate shaft, a hollow torsion shaft, a base mounting trolley, a concave box beam, a gear shaping mechanism and an oil cylinder; the hollow torsion shaft penetrates through the rotary rolling mechanism along the machining center line to be connected with the pierced billet, the driving assembly provides circumferential rotation and axial drawing composite motion for the pierced billet in the rotary rolling machining process, the pierced billet deforms in the circumferential direction and the radial direction, the deformation speed is controllable, the wall thickness is uniform, and the machining process is short.

Description

Technical Field

[0001] This utility model belongs to the field of pipe processing machinery technology, specifically relating to a seamless thin-walled tube rotary drawing mechanism. Background Technology

[0002] Seamless thin-walled tubes are usually produced by cold rolling or cold drawing on hot-rolled seamless tubes. The steel tubes are formed in an annular die composed of a variable cross-section outer die and a mandrel inner die. However, the quality of the tube wall thickness is difficult to control due to the influence of many factors during processing, resulting in low uniformity of wall thickness after processing. It is necessary to add a leveling process and a sizing process to meet the specification requirements, which greatly increases the processing time and labor costs. Utility Model Content

[0003] The purpose of this invention is to provide a rotary drawing mechanism for seamless thin-walled tubes, which provides a combined rotary and drawing motion for seamless rough tubes during the rotary rolling process, thereby solving the problems existing in the prior art and achieving uniform wall thickness processing of seamless thin-walled tubes.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] A seamless thin-walled tube rotary drawing mechanism includes a drive assembly arranged in sequence for driving the tube drawing assembly to move, a tube drawing assembly for fixing and pulling the raw tube, and a front end for mounting the tube drawing assembly and the drive assembly.

[0006] The drive assembly includes a sprocket motor, a sprocket coupling, a sprocket reducer, a sprocket shaft, a sprocket, and a plate chain; the output shaft of the sprocket motor is connected to the input shaft of the sprocket reducer via the sprocket coupling, and a keyway is provided at the end of the sprocket shaft (reducer output shaft) to connect to the sprocket, and the sprocket meshes with the plate chain;

[0007] The sprocket shaft outputs from both ends, each connected to a sprocket. The two sprockets respectively mesh with and connect to two rows of parallel plate chains. The two rows of parallel plate chains are arranged symmetrically about the machining center line of the spinning mechanism (hereinafter referred to as the machining center line).

[0008] The tube drawing assembly includes a torsion motor, a torsion reducer, a torsion coupling, an intermediate shaft, a hollow torsion shaft, a base mounting trolley, a concave box beam, a gear shaping mechanism, and a hydraulic cylinder. The output end of the torsion motor is connected to the input end of the torsion reducer. The torsion reducer is fixed on the base mounting trolley, and its output end is connected to the intermediate shaft via the torsion coupling. The intermediate shaft is mounted in an intermediate shaft bearing seat on the base mounting trolley via bearings to reduce bending and torsion of the reducer shaft. The output end of the intermediate shaft is connected to the hollow torsion shaft. The other end of the hollow torsion shaft has a cylindrical pin hole that is symmetrical about the center and extends through it. The cylindrical pin hole and one end of the rough tube are pre-machined. The pin holes are of the same size. The outer diameter of one end of the open hole of the rough tube is smaller than the inner diameter of the hollow torsion shaft and there is a certain gap. Four sets of wheel mechanisms are installed at the bottom of the base mounting trolley. The concave box beams are arranged in pairs and placed on both sides of the base mounting trolley and are symmetrical with respect to the machining center line. The concave box beams extend outward to form a mounting platform. The gear-shaping mechanism is a square structure installed in the corresponding through square groove of the mounting platform. The upper plane is connected to the oil cylinder, and the lower plane is a tooth structure. The tooth structure meshes with the drive component plate chain. The oil cylinder is installed and fixed on the fixed plane above the mounting platform. The direction of movement of the oil cylinder shaft is parallel to the pressing direction of the tooth structure.

[0009] The front end includes two sets of support structures and tracks. The components are arranged in pairs in parallel and symmetrical arrangement, with a certain interval between the two components. The support structure includes an upper longitudinal beam, a support beam, and a lower longitudinal beam. The upper longitudinal beam is a channel steel with its opening facing upward. The lower longitudinal beam has the same structure as the upper longitudinal beam and the same opening direction. The support beam is a channel steel with its opening facing outward and is arranged on both sides of the short side of the upper and lower longitudinal beams. The support beam is connected to the upper and lower longitudinal beams by welding. There are two tracks arranged between the two sets of support structures, and the track spacing is the same as the wheel structure spacing.

[0010] Furthermore, the sheet chain is laid flat in the groove of the upper longitudinal beam of the front end, and after looping back to the upper longitudinal beam from one end of the front end to the other end, it is connected to the drive component sprocket through the groove of the lower longitudinal beam to form a closed loop;

[0011] Furthermore, the wheel mechanism is placed symmetrically and parallel to each other at the four corners on the track at the front desk;

[0012] Compared with the prior art, the beneficial effects of this utility model are: by connecting the rough tube with a hollow torsion shaft, and by using a drive component, the rough tube is provided with a combined motion of circumferential rotation and axial pulling during the rotary rolling process, so that the rough tube undergoes circumferential and radial deformation, the deformation speed is controllable, the wall thickness is uniform, and the processing flow is short. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structural arrangement of the drive component in this utility model;

[0014] Figure 2 This is a schematic diagram of the main structural arrangement of the tube drawing assembly in this utility model;

[0015] Figure 3 This is a partial top view of the tube-drawing assembly in this utility model;

[0016] Figure 4 This is a schematic diagram of the structural layout of the front desk in this utility model. Detailed Implementation

[0017] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0018] like Figures 1-4 As shown, a seamless thin-walled tube rotary drawing mechanism includes a drive assembly 1 for driving the tube drawing assembly to move, a tube drawing assembly 2 for fixing and pulling the raw tube, and a front end 3 for mounting the tube drawing assembly 2 and the drive assembly 1.

[0019] The drive assembly 1 includes a sprocket motor 101, a sprocket coupling 102, a sprocket reducer 103, a sprocket shaft 104, a sprocket 105, and a plate chain; the output shaft of the sprocket motor 101 is connected to the input shaft of the sprocket reducer 103 through the sprocket coupling 102, and a keyway is provided at the end of the sprocket shaft (reducer output shaft) 104, which is connected to the sprocket 105 through the keyway, and the sprocket 105 meshes with the plate chain;

[0020] The sprocket shaft 104 outputs from both ends, each connected to a sprocket 105. The two sprockets 105 respectively mesh with and connect to two rows of parallel plate chains. The two rows of parallel plate chains are arranged symmetrically about the machining center line of the spinning mechanism 4.

[0021] The tube drawing assembly 2 includes a torsion motor 201, a torsion reducer 202, a torsion coupling 203, an intermediate shaft 204, a hollow torsion shaft 205, a base mounting trolley 206, a concave box beam 207, a gear shaping mechanism 208, and a hydraulic cylinder 209. The output end of the torsion motor 201 is connected to the input end of the torsion reducer 202. The torsion reducer 202 is fixed on the base mounting trolley 206, and its output end is connected to the intermediate shaft 204 through the torsion coupling 203. The intermediate shaft 204 is mounted in an intermediate shaft bearing seat on the base mounting trolley 206 through bearings to reduce the bending and torsion of the reducer shaft. The output end of the intermediate shaft 204 is connected to the hollow torsion shaft 205. The other end of the hollow torsion shaft 205 has a cylindrical pin hole that is symmetrical about the center and passes through it. The cylindrical pin hole has the same size as the pin hole pre-machined at one end of the rough tube. The outer diameter of the pin hole end of the rough tube is smaller than the inner diameter of the hollow torsion shaft 205 and there is a certain gap. Four sets of wheel mechanisms 210 are installed at the bottom of the base mounting trolley. Concave box beams 207 are arranged in pairs and placed on both sides of the base mounting trolley 206 and are symmetrical with respect to the machining center line. The concave box beams 207 extend outward to form a mounting platform. The gear-shaping mechanism 208 is a square structure installed in the corresponding through square groove of the mounting platform. The upper plane is connected to the hydraulic cylinder 209, and the lower plane is a toothed structure. The toothed structure meshes with the drive component plate chain. The hydraulic cylinder 209 is fixed to the fixed plane above the mounting platform by bolts. The direction of the hydraulic cylinder 209 shaft movement is parallel to the pressing direction of the toothed structure.

[0022] In this embodiment, the motor 201 and the reducer output shaft are arranged crosswise;

[0023] In this embodiment, the number of concave box beams 207 is 2, 4, 6, ...;

[0024] In this embodiment, the dimensions of the extended mounting platform of the concave box beam 207 exceed the maximum width of the longitudinal beam on the front end.

[0025] The front panel 3 includes two sets of support structures and tracks. The components are arranged in pairs in parallel and symmetrical arrangement, with a certain interval between the two components. The support structure includes an upper longitudinal beam 301, a support beam 302, and a lower longitudinal beam 303. The upper longitudinal beam 301 is a channel steel with the opening facing upward. The lower longitudinal beam 303 has the same structure as the upper longitudinal beam 301 and the same opening direction. The support beam 302 is a channel steel with the opening facing outward and is arranged on both sides of the short side of the upper longitudinal beam 301 and the lower longitudinal beam 303. The support beam is connected to the upper longitudinal beam 301 and the lower longitudinal beam 303 by welding. There are two tracks 304 arranged between the two sets of support structures. The spacing between the tracks 304 is the same as the spacing between the wheel mechanism 210.

[0026] In this embodiment, the sheet chain is laid flat in the groove of the upper longitudinal beam 301 of the front end 3. After looping back from one end of the front end 3 to the other end of the upper longitudinal beam 301, the sheet chain is connected to the drive component sprocket through the groove of the lower longitudinal beam 303 to form a closed loop.

[0027] In this embodiment, the wheel mechanism 210 is placed symmetrically and parallelly at the four corners on the track 304 of the front end 3.

[0028] The above description is merely a specific embodiment of this utility model and should not be construed as limiting the scope of implementation of this utility model. Therefore, any substitution of equivalent components or equivalent changes and modifications made in accordance with the scope of protection of this utility model should still fall within the scope of the claims of this utility model.

Claims

1. A seamless thin-walled tube rotary draw mechanism characterized by: The drive assembly (1) includes a chain wheel motor (101), a shaft coupling (102), a chain wheel reducer (103), a chain wheel shaft (104), a chain wheel (105) and a sheet chain; the output shaft of the chain wheel motor (101) is connected with the input shaft of the chain wheel reducer (103) through the shaft coupling (102), the chain wheel shaft (104) is provided with a key groove at the end, the chain wheel (105) is connected through the key groove, and the chain wheel (105) is engaged with the sheet chain. The chain wheel shaft (104) outputs from both ends and is connected with a chain wheel (105) at each end, the two chain wheels (105) are engaged with two rows of parallel sheet chains respectively, and the two rows of parallel sheet chains are symmetrically arranged about the machining center line of the rotary rolling mechanism (4). The pipe drawing assembly (2) includes a torsion motor (201), a torsion reducer (202), a torsion shaft coupling (203), an intermediate shaft (204), a hollow torsion shaft (205), a base-mounted trolley (206), a concave box beam (207), a gear shaping mechanism (208) and an oil cylinder (209); the output end of the torsion motor (201) is connected with the input end of the torsion reducer (202), the torsion reducer (202) is fixed on the base-mounted trolley (206) and the output end is connected with the intermediate shaft (204) through the torsion shaft coupling (203), the intermediate shaft (204) is mounted in the intermediate shaft bearing seat on the base-mounted trolley (206) through a bearing, so as to reduce the bending and torsion of the shaft of the reducer, the output end of the intermediate shaft (204) is connected with the hollow torsion shaft (205), the other end of the hollow torsion shaft (205) is symmetrically and penetratively provided with a cylindrical pin hole, the cylindrical pin hole has the same size as the pin hole of one end of the raw pipe, the outer diameter of the raw pipe with the pin hole is smaller than the inner diameter of the hollow torsion shaft (205) and has a certain gap, four groups of wheel mechanisms (210) are mounted on the bottom of the base-mounted trolley (206), the concave box beams (207) are arranged in pairs and symmetrically placed on both sides of the base-mounted trolley (206) relative to the machining center line, the concave box beams (207) extend outward to form a mounting platform, the gear shaping mechanism (208) is a square structure mounted in the corresponding through square groove of the mounting platform, the upper plane is connected with the oil cylinder (209), the lower plane is a toothed structure, the toothed structure is engaged with the sheet chain of the drive assembly, the oil cylinder (209) is mounted and fixed on the fixed plane above the mounting platform, and the shaft movement direction of the oil cylinder (209) is parallel to the pressing direction of the toothed structure. ​ 2. A seamless thin-walled tube rotary drawing mechanism according to claim 1, characterized in that: The front stage (3) includes two sets of support structures, tracks, and each component is arranged in pairs in parallel symmetry, and there is a certain interval between the two components, the support structure includes an upper longitudinal beam (301), a support beam (302), and a lower longitudinal beam (303), the upper longitudinal beam (301) is a channel steel, the channel steel opening is upward, the lower longitudinal beam (303) has the same structure as the upper longitudinal beam (301), and the opening direction is the same, the support beam (302) is a channel steel, the channel steel opening is outwardly arranged on both sides of the short side of the upper longitudinal beam (301) and the lower longitudinal beam (303), the support beam is connected with the upper longitudinal beam (301) and the lower longitudinal beam (303) by welding, and the track (304) is two, arranged on the two sets of support structures, and the track (304) has the same spacing as the wheel mechanism (210).

3. A seamless thin-walled tube rotary drawing mechanism according to claim 2, characterized in that: The sheet chain is arranged in the groove of the upper longitudinal beam (301) of the front stage (3), is wound back to the upper longitudinal beam (301) from one end to the other end of the front stage (3), and is connected with the driving assembly sprocket through the lower longitudinal beam (303) groove and the sheet chain to form a closed loop.

4. The seamless thin-walled tube rotary draw mechanism according to claim 2, characterized in that: The wheel mechanism (210) is symmetrically and parallelly placed at four corners of the track (304) of the front stage (3).

Images