Telescopic clamping mechanism of section forming machine for high-precision pipe rolling

Abstract

The utility model discloses a telescopic clamping mechanism of a section forming machine for high-precision pipe rolling, which comprises a rotating sleeve (1) rotatably connected on a pipe rolling machine, the rotating sleeve (1) is respectively connected with a rotating component and a clamping component, the clamping component comprises a clamping jaw (2) slidably connected on the rotating sleeve (1) along the radial direction, and the clamping jaw (2) is connected with the rotating sleeve (1) along the radial direction. The inner end of the clamping jaw (2) and the rotating sleeve (1) are mutually buckled to form rotating limiting, the outer end of the clamping jaw (2) is connected with a limiting sleeve (3) in a sliding mode, the limiting sleeve (3) and the clamping jaw (2) are mutually attached through a conical face (4), the outer portion of the limiting sleeve (3) is connected with an axial driving assembly, and the axial driving assembly exerts axial driving force on the limiting sleeve (3) through swinging. The clamping stability and the control precision of the clamping jaw can be improved.

Description

Technical Field

[0001] The utility model relates to a pipe rolling machine, in particular to a telescopic clamping mechanism of a section forming machine for high-precision pipe rolling. Background Art

[0002] When the tube rolling mill is rolling the tube, it is necessary to install chucks at the inlet and outlet to clamp the tube and drive it to rotate, so as to realize the rotation function of the tube during the rolling process; at the same time, when the tube is rolled, the chuck needs to open outward to release the clamping of the tube, so that the tube can be driven externally to form axial movement to realize the feeding function.

[0003] Based on the above functional requirements, the clamping mechanism of the existing pipe rolling mill is shown in Patent 201010182509.4. Through the transmission connection structure of the chuck and the sliding sleeve, the axial movement of the sliding sleeve can drive the chuck to extend and retract, thereby realizing the clamping of the pipe; at the same time, by snapping the chuck on the rotating sleeve and connecting the external bearing of the sliding sleeve to the driving member, when the pipe is rotating, the rotating sleeve can drive the chuck to drive the pipe to rotate, thereby realizing the rotation function of the pipe. However, this structure has many defects in actual use:

[0004] First, the structure drives the sleeve to move laterally through multiple telescopic rods distributed in a ring. However, due to the difference in the real-time extension positions of different telescopic rods, they cannot maintain complete synchronization, resulting in the sleeve being pushed to different degrees during the axial movement and causing problems such as tilting and jamming, thereby affecting the driving stability of the sleeve. If the sleeve is driven by only a single telescopic rod, the eccentrically arranged telescopic rod will also cause the sleeve to tilt and jam, resulting in poor driving stability.

[0005] Secondly, the sleeve of this structure is connected to the driving part through the bearing, and the bearing is used as a transmission part to realize the axial limit and drive of the sleeve. However, due to the bearing clearance of the bearing itself, the sleeve will have a small axial movement during the driving translation process, which will cause the control accuracy of the chuck to decrease.

[0006] Thirdly, the rotating sleeve in this structure is connected to the pipe rolling mill through a bearing, but due to the existence of bearing clearance, the rotating sleeve cannot maintain a completely limited state in the axial direction. As a result, when the chuck is lifted and lowered by the compression of the sliding sleeve, the axial movement of the rotating sleeve will be caused, and the positioning accuracy of the chuck will be reduced, so that the chuck will cause the pipe to loosen or deform under pressure during the clamping process.

[0007] Therefore, the pipe clamping mechanism of the existing pipe rolling mill has the problems of poor chuck clamping stability and low control accuracy. Utility Model Content

[0008] The utility model aims to provide a telescopic clamping mechanism for a section forming machine for high-precision tube rolling, which can improve the clamping stability and control accuracy of the clamping claws.

[0009] The technical solution of the utility model: a telescopic clamping mechanism of a section forming machine for high-precision pipe rolling, comprising a rotating sleeve rotatably connected to the pipe rolling machine, the rotating sleeve being respectively connected to a rotating assembly and a clamping assembly, the clamping assembly comprising a clamping jaw connected to the rotating sleeve in a radial sliding manner, the inner end of the clamping jaw and the rotating sleeve being interlocked and forming a rotation limit, the outer end of the clamping jaw being slidably connected to the limit sleeve, the limit sleeve and the clamping jaw being fitted to each other via a conical surface, the outside of the limit sleeve being connected to an axial driving assembly, the axial driving assembly applying an axial driving force to the limit sleeve by swinging.

[0010] In the aforementioned telescopic clamping mechanism, the number of the clamping jaws is multiple and distributed in a ring shape around the rotating sleeve. The rotating sleeve is provided with a first slot for snapping and connecting the clamping jaws. The rotating sleeve achieves axial and circumferential limiting of the clamping jaws through the slot.

[0011] In the aforementioned telescopic clamping mechanism, the inner side of the limit sleeve is annularly distributed with a plurality of second slots for snapping and connecting the clamping jaws. The limit sleeve realizes radial and circumferential limiting of the clamping jaws through the second slots, and the bottom surface of the second slots forms a conical surface that fits the clamping jaws.

[0012] In the aforementioned telescopic clamping mechanism, the axial drive assembly includes a drive ring located outside the limit sleeve, the limit sleeve and the drive ring are nested and rotatably connected, a swing frame is provided outside the drive ring, the lower end of the swing frame is rotatably connected to the pipe rolling mill, the upper end of the swing frame is slidably connected to a drive plate, the outside of the drive plate is connected to a telescopic rod, slide grooves are provided on both sides of the drive ring, and the middle part of the swing frame is buckled and connected in the slide groove through a bayonet;

[0013] When the telescopic rod is extended or retracted, the driving plate applies axial traction to the swing frame, so that the swing frame swings on the tube rolling mill. After the swing frame swings, the driving ring applies axial traction to the driving ring through the bayonet pin, so that the driving ring moves axially together with the limiting sleeve.

[0014] In the aforementioned telescopic clamping mechanism, a step portion is formed at one end of the limit sleeve, and a retaining ring is threadedly connected to the other end of the limit sleeve. A mounting groove is formed between the retaining ring and the step portion. The inner side of the drive ring is located in the mounting groove and is rotatably connected to the limit sleeve via a bearing. The retaining ring and the step portion form an axial limit for the drive ring after the drive ring is installed.

[0015] In the aforementioned telescopic clamping mechanism, the rotating assembly is a worm gear transmission assembly, the worm gear in the worm gear transmission assembly is connected to the rotating sleeve, and the worm in the worm gear transmission assembly is externally connected to a driving motor.

[0016] In the aforementioned telescopic clamping mechanism, one side of the rotating sleeve is rotatably connected to the tube rolling mill via a first bearing, the inner end of the first bearing and the rotating sleeve are buckled with each other, the outer end of the first bearing is connected with a first gland that is detachably connected to the tube rolling mill, the inner wall of the first gland fits the first bearing and is used to limit the axial direction of the rotating sleeve on one side, the other side of the rotating sleeve is rotatably connected to the tube rolling mill via a second bearing, the outer side of the second bearing is provided with a second gland that is detachably connected to the tube rolling mill, the outer side of the second gland is threadedly connected with a torsion ring, the inner wall of the torsion ring and the end of the rotating sleeve fit with each other and are used to squeeze and limit the axial direction of the rotating sleeve;

[0017] When the rotating sleeve is installed, the first pressure cap axially limits one side of the rotating sleeve, and then the operator squeezes the end of the rotating sleeve by screwing in the torsion ring, so that the rotating sleeve moves axially toward the first pressure cap under the squeezing action and forms a tight compression and limiting state, thereby preventing the rotating sleeve from axial movement.

[0018] In the aforementioned telescopic clamping mechanism, the clamping claw is detachably connected to a pressure block at one end close to the rotating sleeve, and the inner end of the pressure block forms a clamping surface for clamping the pipe. The clamping surface is formed by smoothly connecting multiple arc surfaces of different radii, and each arc surface is arranged symmetrically along the center line of the pressure block.

[0019] Compared with the prior art, the utility model has the following characteristics:

[0020] (1) The utility model defines the structure of the axial drive assembly so that the swing frame can apply axial traction to the drive ring through the rotation of the swing frame around the axis, thereby realizing synchronous driving of the drive ring on both sides and effectively improving the driving stability of the drive ring;

[0021] (2) By limiting the connection structure between the limiting sleeve and the driving ring, the limiting sleeve and the driving ring can be axially limited by the cooperation of the retaining ring and the step portion after the rotation connection, thereby avoiding the axial movement of the limiting sleeve caused by the bearing clearance, thereby improving the control accuracy of the claw;

[0022] (3) Through the structural cooperation of the first gland, the second gland and the torsion ring, when installing the rotating sleeve, the operator can squeeze the rotating sleeve by screwing in the torsion ring, so that the rotating sleeve moves axially under the extrusion until it is completely in contact with the first bearing and the first gland, thereby effectively preventing the axial movement of the rotating sleeve after installation and ensuring the axial positioning accuracy of the rotating sleeve; and under the above cooperation, the claw can keep its axial position fixed during the radial movement process, thereby ensuring the control accuracy of its tapered surface drive structure;

[0023] Therefore, the utility model can improve the clamping stability and control accuracy of the clamping jaws. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 is a cross-sectional view of the telescopic clamping mechanism;

[0025] Figure 2 yes Figure 1 A-direction sectional view;

[0026] Figure 3 It is the appearance drawing of the telescopic clamping mechanism.

[0027] The marks in the accompanying drawings are: 1-rotating sleeve, 2-clamping claw, 3-limiting sleeve, 4-tapered surface, 5-first slot, 6-second slot, 7-driving ring, 8-swinging frame, 9-driving plate, 10-telescopic rod, 11-slide groove, 12-pin, 13-step portion, 14-blocking ring, 15-worm gear, 16-worm, 17-first bearing, 18-first pressure cover, 19-second bearing, 20-second pressure cover, 21-torsion ring, 22-pressure block, 23-clamping surface. DETAILED DESCRIPTION

[0028] The present invention is further described below in conjunction with the accompanying drawings and embodiments, but they are not intended to limit the present invention.

[0029] Embodiment. A telescopic clamping mechanism of a high-precision tube rolling section forming machine is constructed as follows Figure 1 As shown, it includes a rotating sleeve 1 rotatably connected to the pipe rolling mill, and the rotating sleeve 1 is respectively connected to a rotating component and a clamping component, and the clamping component includes a clamping jaw 2 which is radially slidably connected to the rotating sleeve 1, the inner end of the clamping jaw 2 and the rotating sleeve 1 are interlocked and form a rotation limit, the outer end of the clamping jaw 2 is slidably connected to a limit sleeve 3, the limit sleeve 3 and the clamping jaw 2 are fitted with each other via a tapered surface 4, and the outside of the limit sleeve 3 is connected to an axial driving component, and the axial driving component applies an axial driving force to the limit sleeve 3 by swinging.

[0030] The telescopic clamping mechanism is installed at the inlet chuck and the outlet chuck of the tube rolling mill, and clamps and drives the tube blank before rolling and the finished tube after rolling respectively.

[0031] There are multiple clamping jaws 2 distributed in a ring shape around the rotating sleeve 1. The rotating sleeve 1 is provided with a first slot 5 for snapping and connecting the clamping jaws 2. The rotating sleeve 1 limits the clamping jaws 2 axially and circumferentially through the slot.

[0032] The inner side of the limiting sleeve 3 is annularly distributed with a plurality of second slots 6 for snap-fitting the clamping jaws 2. The cross-sectional shape of the second slots 6 is T-shaped. The limiting sleeve 3 realizes radial and circumferential limiting of the clamping jaws 2 via the second slots 6. The bottom surface of the second slots 6 forms a conical surface 4 that fits the clamping jaws 2.

[0033] The axial drive assembly includes a drive ring 7 located outside the limit sleeve 3, the limit sleeve 3 and the drive ring 7 are nested inside and outside and connected to each other through bearings, a swing frame 8 is provided outside the drive ring 7, the lower end of the swing frame 8 is rotatably connected to the pipe rolling mill, the upper end of the swing frame 8 is slidably connected to a drive plate 9, the outside of the drive plate 9 is connected to a telescopic rod 10 fixedly connected to the pipe rolling mill, and slide grooves 11 are provided on both sides of the drive ring 7, and the middle part of the swing frame 8 is buckled and connected in the slide groove 11 through a bayonet 12;

[0034] When the telescopic rod 10 is telescopic, it applies an axial traction force to the swing frame 8 through the driving plate 9, so that the swing frame 8 swings on the pipe rolling mill. After the swinging, the swing frame 8 applies an axial traction force to the drive ring 7 through the bayonet 12, so that the drive ring 7 forms an axial movement together with the limit sleeve 3; the driving plate 9 slides up and down in the vertical direction on the swing frame 8 as the swinging frame 8 swings, and the bayonet 12 slides up and down in the vertical direction in the slide groove 11 as the swinging frame swings.

[0035] A step portion 13 is formed at one end of the limit sleeve 3, and a retaining ring 14 is threadedly connected to the other end of the limit sleeve 3. A mounting groove is formed between the retaining ring 14 and the step portion 13. The inner side of the drive ring 7 is located in the mounting groove and is rotatably connected to the limit sleeve 3 via a bearing. The retaining ring 14 and the step portion 13 form an axial limit for the drive ring 7 after the drive ring 7 is installed.

[0036] The rotating assembly is a worm gear transmission assembly, in which a worm wheel 15 is key-connected to the rotating sleeve 1, and a worm 16 in the worm gear transmission assembly is externally connected to a driving motor.

[0037] One side of the rotating sleeve 1 is rotatably connected to the tube rolling mill via the first bearing 17, the inner end of the first bearing 17 and the rotating sleeve 1 are buckled with each other, the outer end of the first bearing 17 is connected with a first gland 18 that is detachably connected to the tube rolling mill, the inner wall of the first gland 18 fits the first bearing 17 and is used to limit the axial direction of the rotating sleeve 1 on one side, the first bearing 17 and the worm gear 15 fit each other via a spacer, and the worm gear 15 is buckled and connected to the rotating sleeve 1 on the side away from the first bearing 17;

[0038] The other side of the rotating sleeve 1 is rotatably connected to the tube rolling mill via the second bearing 19. The second bearing 19 is provided with a second gland 20 detachably connected to the tube rolling mill on the outside. The inner and outer sides of the second bearing 19 are respectively engaged with the rotating sleeve 1 and the second gland 20. The outer thread of the second gland 20 is connected with a torsion ring 21. The inner wall of the torsion ring 21 and the end of the rotating sleeve 1 are attached to each other and are used to squeeze and limit the axial direction of the rotating sleeve 1.

[0039] When the rotating sleeve 1 is installed, the first pressure cap 18 axially limits one side of the rotating sleeve 1, and then the operator squeezes the end of the rotating sleeve 1 by screwing in the torsion ring 21, so that the rotating sleeve 1 moves axially toward the first pressure cap 18 under the squeezing action and forms a tight compression and limiting state, thereby preventing the rotating sleeve 1 from axial movement.

[0040] The clamping jaw 2 is detachably connected to a pressing block 22 at one end close to the rotating sleeve 1, and the inner end of the pressing block 22 forms a clamping surface 23 for clamping the pipe. The clamping surface 23 is formed by smoothly connecting multiple arc surfaces with different radii, and each arc surface is arranged symmetrically along the center line of the pressing block 22. Through the clamping surface 23 formed by sequentially connecting the arc surfaces, the pressing block 22 can form surface contact with the pipe through the corresponding arc surface when clamping the pipes with different outer diameters, thereby improving its clamping stability.

[0041] Working principle of the utility model: During installation, the operator can squeeze the rotating sleeve 1 through the torsion ring 21, so that the rotating sleeve 1 moves axially toward the first gland 18 after squeezing and is clamped accordingly, thereby effectively preventing the rotating sleeve 1 from axially moving during use. At the same time, through the cooperation of the step portion 13 and the retaining ring 14, the drive ring 7 and the limit sleeve 3 can be clamped after being connected to each other, thereby preventing the drive ring 7 from axially moving relative to the limit sleeve 3. Under the above cooperation, on the one hand, the clamping jaw 2 can be in a fixed axial position during operation, and on the other hand, the control accuracy of the swing frame 8 on the clamping jaw 2 after swinging can be improved, thereby improving the positioning accuracy of the clamping jaw 2 after clamping, and avoiding the problem of loose pipe or deformation of pipe under pressure.

[0042] When the pipe is in a rotating state, the contraction of the telescopic rod 10 drives the swing frame 8 to swing counterclockwise, so that the swing frame 8 exerts an axial driving force on the drive ring 7 through the cooperation of the bayonet pin 12 and the slide slot 11 after the swing. After the drive ring 7 is subjected to force, it drives the limit sleeve 3 to move axially, and the limit sleeve 3 exerts an inward extrusion force on the clamping jaw 2 through the conical surface 4 during the movement, so that the clamping jaw 2 moves radially inward and clamps the pipe. After the clamping jaw 2 is clamped in place, the worm gear transmission assembly drives the rotating sleeve 1 to rotate, and after the rotating sleeve 1 rotates, it drives the clamping jaw 2 and the limit sleeve 3 to rotate synchronously through the first slot 5, thereby realizing the rotation function of the pipe.

[0043] When the tube mill is in the feeding state, the clamping jaws 2 open in the opposite direction in the same driving mode, thereby releasing the clamping of the tube, and then the external driving device drives the tube to translate, thereby realizing the axial movement of the tube. During the axial movement of the tube, the rotating sleeve 1 can limit the position of the tube, so that the center line of the tube and the rolling center of the tube mill remain coaxial.

Claims

1. A telescopic clamping mechanism for a high-precision tube rolling section forming machine, characterized in that: The invention comprises a rotating sleeve (1) rotatably connected to a tube rolling mill, wherein a rotating assembly and a clamping assembly are respectively connected to the rotating sleeve (1), wherein the clamping assembly comprises a clamping jaw (2) slidably connected to the rotating sleeve (1) in a radial direction, wherein the inner end of the clamping jaw (2) and the rotating sleeve (1) are interlocked to form a rotation limit, and the outer end of the clamping jaw (2) is slidably connected to a limit sleeve (3), wherein the limit sleeve (3) and the clamping jaw (2) are mutually fitted via a conical surface (4), and an axial driving assembly is connected to the outside of the limit sleeve (3), wherein the axial driving assembly applies an axial driving force to the limit sleeve (3) by swinging.

2. The telescopic clamping mechanism of the high-precision tube rolling section forming machine according to claim 1, characterized in that: The number of the clamping jaws (2) is plural and they are distributed in a ring shape around the rotating sleeve (1). The rotating sleeve (1) is provided with a first clamping groove (5) for snapping and connecting the clamping jaws (2). The rotating sleeve (1) realizes axial and circumferential limiting of the clamping jaws (2) through the clamping groove.

3. The telescopic clamping mechanism of the high-precision tube rolling section forming machine according to claim 2, characterized in that: The inner side of the limiting sleeve (3) is provided with a plurality of second slots (6) which are arranged in an annular shape and are engaged with the clamping jaw (2). The limiting sleeve (3) realizes radial and circumferential limiting of the clamping jaw (2) via the second slots (6), and the bottom surface of the second slots (6) forms a conical surface (4) which fits the clamping jaw (2).

4. The telescopic clamping mechanism of the high-precision tube rolling section forming machine according to claim 3, characterized in that: The axial drive assembly comprises a drive ring (7) located outside the limit sleeve (3), the limit sleeve (3) and the drive ring (7) are nested and rotatably connected, a swing frame (8) is arranged outside the drive ring (7), the lower end of the swing frame (8) is rotatably connected to the pipe rolling mill, the upper end of the swing frame (8) is slidably connected to a drive plate (9), the outside of the drive plate (9) is connected to a telescopic rod (10), and slide grooves (11) are arranged on both sides of the drive ring (7), and the middle part of the swing frame (8) is buckled and connected in the slide groove (11) through a bayonet (12); When the telescopic rod (10) is extended or retracted, it applies an axial traction force to the swing frame (8) via the driving plate (9), so that the swing frame (8) swings on the pipe rolling mill. After the swing frame (8) swings, it applies an axial traction force to the drive ring (7) via the bayonet (12), so that the drive ring (7) moves axially together with the limiting sleeve (3).

5. The telescopic clamping mechanism of the high-precision tube rolling section forming machine according to claim 4, characterized in that: A step portion (13) is formed at one end of the limiting sleeve (3), and a retaining ring (14) is threadedly connected to the other end of the limiting sleeve (3). A mounting groove is formed between the retaining ring (14) and the step portion (13). The inner side of the driving ring (7) is located in the mounting groove and is rotatably connected to the limiting sleeve (3) via a bearing. The retaining ring (14) and the step portion (13) form an axial limit for the driving ring (7) after the driving ring (7) is installed.

6. The telescopic clamping mechanism of the high-precision tube rolling section forming machine according to claim 1, characterized in that: The rotating assembly is a worm gear transmission assembly, the worm wheel (15) in the worm gear transmission assembly is drivingly connected to the rotating sleeve (1), and the worm (16) in the worm gear transmission assembly is externally connected to a driving motor.

7. The telescopic clamping mechanism of the high-precision tube rolling section forming machine according to claim 6, characterized in that: One side of the rotating sleeve (1) is rotatably connected to the tube rolling mill via a first bearing (17), the inner end of the first bearing (17) and the rotating sleeve (1) are buckled with each other, the outer end of the first bearing (17) is connected with a first gland (18) which is detachably connected to the tube rolling mill, the inner wall of the first gland (18) is in contact with the first bearing (17) and is used to limit the axial direction of the rotating sleeve (1) on one side, the other side of the rotating sleeve (1) is rotatably connected to the tube rolling mill via a second bearing (19), the outer side of the second bearing (19) is provided with a second gland (20) which is detachably connected to the tube rolling mill, the outer side of the second gland (20) is threadedly connected with a torsion ring (21), the inner wall of the torsion ring (21) and the end of the rotating sleeve (1) are in contact with each other and are used to squeeze and limit the axial direction of the rotating sleeve (1); When the rotating sleeve (1) is installed, the first pressure cap (18) axially limits one side of the rotating sleeve (1), and then the operator squeezes the end of the rotating sleeve (1) by screwing in the torsion ring (21), so that the rotating sleeve (1) moves axially towards the first pressure cap (18) under the squeezing action and forms a tight pressure limiting state, thereby preventing the rotating sleeve (1) from axial movement.

8. The telescopic clamping mechanism of the high-precision tube rolling section forming machine according to claim 1, characterized in that: The clamping jaw (2) is detachably connected to a pressing block (22) at one end close to the rotating sleeve (1); the inner end of the pressing block (22) forms a clamping surface (23) for clamping the pipe; the clamping surface (23) is formed by smoothly connecting a plurality of circular arc surfaces with different radii; and the circular arc surfaces are arranged symmetrically along the center line of the pressing block (22).

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