CN216679908U - Thick wall heating steel pipe both ends spinning draw-in steel pipe reducing device - Google Patents

Abstract

The utility model is suitable for the technical field of steel pipe processing, and provides a thick-wall heating steel pipe two-end spinning and drawing steel pipe reducing device, which comprises: the device mesa is located erect on the lateral wall of device mesa and install the stand, just the top looks vertically rigid coupling of stand have with the backup pad that the device mesa paralleled, fixed mounting has extending to of part in the backup pad the clamping mechanism of device mesa central point put, just clamping mechanism is used for pressing from both sides tight steel pipe, is located the steel pipe both sides equally divide on the device mesa do not slidable relatively and be provided with reducing mechanism, carry to the device mesa after carrying out the heat treatment to the steel pipe of cutting off the completion through preheating component, put through clamping mechanism to the central point of steel pipe and carry out the centre gripping fixed, the reducing mechanism of drive both sides removes towards the steel pipe intermediate position (the distance of removal is decided by design control) in step, realizes the draw processing operation to the steel pipe tip.

Description

Thick wall heating steel pipe both ends spinning stretch-shrink steel pipe undergauge device

Technical Field

The utility model belongs to the technical field of steel pipe processing, and particularly relates to a diameter reducing device for thick-wall heating steel pipes with spinning and drawing steel pipes at two ends.

Background

The diameter reducing device is a device for reducing the diameter of the end surface of a pipe or a bar in a normal state, and generally comprises a rack; the pipe (bar) clamping device comprises a clamping die assembly arranged on a rack, a clamping cylinder arranged on the rack and positioned above the clamping die assembly, wherein the clamping cylinder drives the clamping die assembly to clamp a pipe (bar), the clamping die assembly comprises an upper clamping die and a lower clamping die, the lower clamping die is fixed on the rack, the upper clamping die is arranged on the lower clamping die through a guide pillar and a reset spring in a vertical elastic sliding mode, the clamping cylinder is positioned above the upper clamping die, the upper clamping die is applied with force when the pipe is contracted, and the upper clamping die and the lower clamping die are matched to clamp the pipe.

Reducing the diameter of the thick-wall steel pipe or the thick-wall steel bar at two ends and shrinking the cold is difficult to achieve; in addition, the diameter of the common conventional method is reduced by separating one end from the other end; the diameter reducing extrusion rolling wheel or the die of the pipe (rod) reducing material acts to reduce the pipe diameter or the rod diameter of the end part of the pipe (rod) reducing material. And the concentricity of the pipe diameter (rod) needs to be ensured; the common diameter reducing device cannot simultaneously reduce the diameters of two ends of a steel pipe (rod) when in normal use, and influences the processing speed of the steel pipe and the accuracy of concentricity.

SUMMERY OF THE UTILITY MODEL

The utility model provides a diameter reducing device for spinning and drawing steel pipes at two ends of a thick-wall heating steel pipe, and aims to solve the problems in the background technology.

The utility model is realized in this way, a thick wall heating steel pipe two-end spinning draw steel pipe reducing device, including: the device mesa is located erect on the lateral wall of device mesa and install the stand, just the top looks vertically rigid coupling of stand have with the backup pad that the device mesa paralleled, fixed mounting has partial extension to in the backup pad the clamping mechanism that device mesa central point put, just clamping mechanism is used for pressing from both sides tight steel pipe, is located the steel pipe both sides equally divide on the device mesa respectively relative slidable be provided with reducing mechanism, through both sides reducing mechanism is used for realizing right the corresponding tip of steel pipe carries out the draw processing.

Preferably, the clamping mechanism includes: the steel pipe detachable fixed connection in on the lifting fixture, and, correspond the backup pad the top of device mesa still is provided with and can accepts lifting fixture's fixed die clamp, wherein, the output of pressing cylinder runs through the backup pad, and the rigid coupling has lifting fixture.

Preferably, each of the diameter reducing mechanisms includes: set up in the mount pad of clamping mechanism one side, wherein, the mount pad is close to rotatable chuck that is provided with on a side end face of steel pipe, the uniform distribution of equidistance on the chuck has three removal tooth, every all slide in the removal tooth and be provided with the jack catch, and every all rotatable being provided with the butt on the jack catch in rolling wheel on the steel pipe outer wall, wherein, the top of mount pad is provided with rotating electrical machines, and the rigid coupling has the drive wheel on its output, just the drive wheel with the transmission is connected with the chain between the chuck, and, be located the mount pad is kept away from it has the extrusion motor to go back the rigid coupling on the one end outer wall of steel pipe, and its output cooperation is connected to a plurality ofly on the jack catch.

Preferably, be located clamping mechanism both sides still symmetrical be provided with many square guide rails on the device mesa, just the bottom of mount pad still corresponds many the square guide rail is provided with the square slider of one-to-one complex, wherein, still be provided with the motor that draws in the mount pad, the rigid coupling has the lead screw on its output, just the lead screw with the mount pad is mutually supported.

Preferably, a fixed steel bar is embedded and fixed in the center of the chuck.

Preferably, each square guide rail is provided with a front limiting piece at one end close to the clamping mechanism, a rear limiting piece is arranged at one end far away from the clamping mechanism, and the displacement distance of the mounting seat is limited by the front limiting piece and the rear limiting piece.

Preferably, the system further comprises a preheating assembly before shrinking the steel pipe, wherein the preheating assembly comprises: electric rolling mechanism, it is used for accomplishing the cutting off the steel pipe is carried, and a high temperature resistant section of thick bamboo, it is used for receiving the warp electric rolling mechanism carries the steel pipe, and, the winding has intermediate frequency heating coil on the outer wall of a high temperature resistant section of thick bamboo, just intermediate frequency heating coil electric connection intermediate frequency heater is located the bottom of a high temperature resistant section of thick bamboo is provided with mobilizable baffle, just the output rigid coupling of baffle and pull cylinder is located the below of baffle still is provided with the lift cylinder, just the rigid coupling has the extensible to on the output of lift cylinder the layer board of high temperature resistant bobbin base portion, wherein, still including moving mechanism, has been equipped with material loading anchor clamps in it, through material loading anchor clamps are used for the centre gripping the steel pipe carry to in the clamping mechanism.

Compared with the prior art, the utility model has the beneficial effects that: the utility model relates to a diameter reducing device for thick-wall heating steel pipes, which is used for spinning and drawing the two ends of the steel pipes:

after the steel pipe that the cutting was accomplished is heated through preheating the subassembly, carry to the device mesa on, then, carry out centre position to the steel pipe through clamping mechanism and carry out centre gripping fixed, simultaneously, the undergauge mechanism of drive both sides removes towards the steel pipe in step, realizes the undergauge processing operation to the steel pipe tip.

In addition, this device not only can realize the undergauge processing operation to the steel pipe, and this device can also be adapted to carry out the undergauge operation to the both ends of rod iron, and then, great promotion this device's application scope for this device makes things convenient for the undergauge operation of staff to steel pipe/rod iron more.

Drawings

FIG. 1 is a schematic view of the overall structure of the present invention;

FIG. 2 is a side view of the present invention;

FIG. 3 is a schematic view of the structure of the chuck of the present invention;

FIG. 4 is a partial block diagram of FIG. 1 according to the present invention;

FIG. 5 is a schematic view of a pre-heating assembly according to the present invention;

FIG. 6 is a schematic view of a steel pipe after completion of pipe shrinking according to the present invention;

FIG. 7 is a diagram illustrating the effect of the present invention after pipe/rod shrinking;

in the figure:

1. a device table-board;

2. a column;

3. a support plate;

4. a clamping mechanism; 41. a pressing oil cylinder; 42. lifting the clamp; 43. fixing the clamping die;

5. a steel pipe;

6. a diameter reducing mechanism; 61. a mounting seat; 611. a square slider; 62. a chuck; 621. moving the teeth; 622. a claw; 623. rolling wheels; 63. a rotating electric machine; 631. a driving wheel; 64. an extrusion motor; 65. a square guide rail; 66. a drawing motor; 661. a screw rod; 67. fixing the steel bar;

7. a pre-heating assembly; 71. an electric rolling mechanism; 72. a high temperature resistant cylinder; 721. a medium-frequency heating coil; 722. an intermediate frequency heater; 73. a baffle plate; 731. a drawing cylinder; 74. a lifting cylinder; 741. a support plate; 75. a moving mechanism; 751. and (4) feeding the clamp.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the present invention more apparent, the present invention will be further described in detail with reference to the accompanying drawings and embodiments, it being understood that the specific embodiments described herein are merely illustrative of the present invention and are not intended to limit the present invention.

Referring to fig. 1-6, the present invention provides a technical solution,

the utility model provides a thick wall heating steel pipe both ends spinning draw steel pipe undergauge device, includes: the device comprises a device table top 1, wherein an upright post 2 is vertically arranged on one side wall of the device table top 1, a supporting plate 3 parallel to the device table top 1 is fixedly connected to the top end of the upright post 2 in a vertical mode, a part of a clamping mechanism 4 extending to the center of the device table top 1 is fixedly arranged on the supporting plate 3, and the clamping mechanism 4 is used for clamping a steel pipe 5;

the clamping mechanism 4 includes: the pressing oil cylinder 41 is fixedly connected to the top of the supporting plate 3, wherein the output end of the pressing oil cylinder 41 penetrates through the supporting plate 3 and is fixedly connected with a lifting clamp 42, the steel pipe 5 is detachably and fixedly connected to the lifting clamp 42, and a fixing clamp die 43 capable of bearing the lifting clamp 42 is further arranged on the top of the device table board 1 corresponding to the supporting plate 3.

Specifically, after steel pipe 5 carried to device mesa 1, can carry to in clamping mechanism 4, wherein, steel pipe 5 is by the centre gripping of lifting fixture 42, then, the action of pressure cylinder 41, it carries out the lift displacement of direction of height to drive lifting fixture 42, thereby drive steel pipe 5 and remove predetermined high position, and simultaneously, lifting fixture 42's bottom displacement is to on the fixed die clamping 43, realize accepting fixedly lifting fixture 42 through fixed die clamping 43, and then, effectual undergauge mechanism 6 who has guaranteed follow-up both sides can carry out synchronous undergauge operation to the both ends of steel pipe 5 simultaneously, avoid appearing the dislocation at undergauge in-process steel pipe 5, phenomenons such as skew.

Referring to fig. 1-6, the table surfaces 1 of the device on both sides of the steel pipe 5 are respectively provided with a diameter reducing mechanism 6 in a relatively slidable manner, and the diameter reducing mechanisms 6 on both sides are used for reducing the corresponding end portions of the steel pipe 5;

each diameter reducing mechanism 6 includes: the mounting seat 61 is arranged on one side of the clamping mechanism 4, wherein a chuck 62 is rotatably arranged on the end surface of one side of the mounting seat 61 close to the steel pipe 5, three moving teeth 621 are uniformly distributed on the chuck 62 at equal angles, a jaw 622 is slidably arranged in each moving tooth 621, a rolling wheel 623 abutted against the outer wall of the steel pipe 5 is rotatably arranged on each jaw 622, a rotating motor 63 is arranged at the top of the mounting seat 61, a transmission wheel 631 is fixedly connected to the output end of the rotating motor, a chain is connected between the transmission wheel 631 and the chuck 62 in a transmission manner, an extrusion motor 64 is further fixedly connected to the outer wall of one end of the mounting seat 61 far away from the steel pipe 5, and the output end of the extrusion motor is connected to the jaws 622 in a matching manner;

the device table board 1 at the two sides of the clamping mechanism 4 is also symmetrically provided with a plurality of square guide rails 65, the bottom of the mounting base 61 is also provided with square sliding blocks 611 matched with the square guide rails 65 one by one, wherein a stretching motor 66 is also arranged in the mounting base 61, the output end of the stretching motor is fixedly connected with a screw rod 661, and the screw rod 661 is matched with the mounting base 61;

(in other embodiments, the drawing motor 66 can also move the mounting base 61 in a cylinder driving manner).

A fixed steel bar 67 is also embedded and fixed at the center of the chuck 62;

one end of each square guide rail 65, which is close to the clamping mechanism 4, is provided with a front limiting piece, one end of each square guide rail, which is far away from the clamping mechanism 4, is provided with a rear limiting piece, and the displacement distance of the mounting seat 61 is limited by the front limiting piece and the rear limiting piece.

Specifically, the two ends of the steel pipe 5 are thermally reduced simultaneously, and a diameter of 24mm is fixed at the center in the chuck 62 and the connecting plate (not shown in the figure) (the diameter of the fixing steel bar 67 is determined according to the requirement of the pipe to be reduced, and is not limited to 24mm, and the 24mm selected in this embodiment is only for convenience of explaining the working process of the device) (in this embodiment, the fixing steel bar 67 is selected because the steel pipe 5 is squeezed by external force when the steel pipe is reduced, and the inner diameter of the steel pipe 5 changes, and the diameter and length of the fixing steel bar 67 are designed to be prevented from changing according to the inner diameter and length of the pipe to be reduced), so that the diameter of the fixing steel bar 67 can be selected to be 24mm for convenience of realizing the explanation of the scheme, but in other embodiments, the diameter of the fixing steel bar 67 is not limited to 24mm, the worker can select the fixed steel bar 67 with a proper diameter according to the actual requirement of the machining size to limit the inner diameter of the contracted pipe (diameter reduction) to 24mm, the fixed steel bar 67 rotates along with the chuck 62,

firstly, selecting a steel pipe 5 made of a raw material with a proper outer diameter and a proper wall thickness;

blanking the steel pipe 5 according to a certain length;

placing the steel pipe 5 which is fed with the material into a medium-frequency heating coil 721 which is electrically connected with a medium-frequency heater 722 for electrical heating;

placing the steel pipe 5 heated to 860 ℃ on a lower die of a pipe reducing machine;

pressing the upper clamping die of the starting button downwards to compress the workpiece (wherein, the support side wall of the reduced workpiece middle clamp adopts a single-arm support mode in the embodiment, (in other embodiments, a four-column type support frame structure can also be adopted for supporting and fixing, and the aim is mainly to increase the stability of the upper clamping tool and facilitate the subsequent installation of a continuous heating device for the workpiece in the reducing process);

the diameter reducing mechanisms 6 at the two ends of the steel pipe 5 synchronously and automatically reach the position 9mm (the set value is not an absolute value, and a numerical value is determined according to the requirement of pipe reducing) of the central position of the length of the steel pipe 5 and stop, the two chucks 62 automatically rotate, and the two clamping heads automatically reduce towards the pipe center;

reducing mechanisms 6 at two ends of the steel pipe 5 automatically move backwards to the tail part (the distance can be set) of the steel pipe 5 or the steel bar;

the reducing mechanisms 6 at the two ends of the steel pipe 5 automatically reach the middle position of the steel pipe 5 or the steel bar forwards and stop, the chuck 62 automatically rotates, and the clamping head automatically contracts towards the center of the workpiece (namely the reduced steel pipe 5);

repeating the process for multiple times (the extrusion depth is determined according to the torque of the drawing and shrinking motor) until the diameter of the steel pipe 5 is preset to a value (the diameter reducing size is determined according to the requirement of the pipe reducing);

when the two ends of the steel pipe 5 are drawn and contracted to the specified diameter (the diameter reducing size is according to the requirement of the pipe reducing), the diameter reducing mechanism 6 is automatically stopped at the tail part of the device, the upper pressing die cylinder is automatically lifted upwards, and the contracted workpiece 5 is taken out.

In the present embodiment, the number of the plurality of jaws 622 on the chuck 62 is preferably 1 to 4, wherein when 1 to 2 jaws 622 are provided on the chuck 622, only the compression extrusion of the steel pipe or the steel bar 5 is realized; centering the steel pipe 5 or the steel bar is realized when the claw is 3; 4, the claws can be eccentric and reduced in diameter; the number of the extruding claws (claws 622) is selected according to the requirements of the shrinking pipe or the shrinking rod.

In addition, in order to ensure that the steel pipe 5 or the steel rod realizes zero torque (the workpiece has no rotating torque) when reducing the diameter, it is preferable that the rotating directions of the output ends of the rotating motors 63 located at both sides are opposite, that is, the output end of the rotating motor 63 at one side rotates clockwise, and the output end of the rotating motor 63 at the other side rotates counterclockwise, so that the steel pipe 5 or the steel rod does not rotate when reducing the diameter.

It can be known from the foregoing that this device not only can realize the undergauge to steel pipe 5, simultaneously, also can realize the undergauge operation to the rod iron, specifically, when carrying out the undergauge to steel pipe 5 or rod iron, this device can include following four kinds of mode as shown:

the first mode is as follows: the steel pipe 5 or the steel bar is clamped and fixed on a clamping mould arranged at the central position of the table board 1 of the device, meanwhile, the reducing mechanisms 6 at two sides are respectively displaced to two ends of the steel pipe 5 or the steel bar, the reducing operation of the end part of the steel pipe 5 or the steel bar is realized on the one hand by a positive and negative rotation mode, meanwhile, the steel pipe 5/the steel bar with reduced diameter is prevented from rotating, and the reducing quality is ensured;

and a second mode: the steel pipe 5 or the steel bar are clamped and fixed on a clamping mould arranged at the central position of the table top 1 of the device, the clamping mould can be in a hydraulic transmission or electric transmission mode through an oil pump, the clamping mould at the central position is controlled to rotate along the central shaft, meanwhile, the reducing mechanisms 6 at the two sides do not rotate, only abut against the two end parts of the steel pipe 5 or the steel bar, and move back and forth along a preset numerical control mode, so that the reducing operation of the steel pipe 5 or the end part of the steel bar is realized.

It should be noted that, in the first mode and the second mode, the displacement of the reducing mechanism 6 is shifted by the moving distance set in the numerical control mode in advance, and further, the control of the reducing size of the steel pipe 5 or the steel bar can be effectively ensured.

And a third mode: the third steel pipe 5 or the steel bar is clamped immovably by adopting a mold (two separated parts) (the clamping mode is horizontal clamping), molds at two ends of the workpiece (the molds at two ends are respectively horizontally arranged at two sides of a central clamping mold), and the middle part (the mold for clamping the workpiece) is extruded under the control of an oil cylinder, so that the workpiece is extruded into a required shape;

and a fourth mode: the principle of the fourth mode and the third mode is different in that the workpiece is vertically arranged in a clamping device, the extrusion dies on two sides are respectively arranged at the upper position and the lower position of the feeding die in the vertical direction, and the workpiece is extruded into a required shape in the die under the control of the oil cylinder.

Note that the matters to be noted in the third and fourth modes are: the clamping die (it is two parts package assembly, and clamping die has at least four limit points (specifically select according to the mould size) that central point puts, and the first half of clamping die is for opening (movable part), and the latter half is fixed knot and constructs, need be unanimous with the work piece appearance of final finished product, and make the external diameter of the work piece central point that is extruded be greater than the external diameter of its both ends position, and the weight of raw and other materials needs be unanimous with the weight of final finished product, otherwise can appear starved, the excessive phenomenon that overflows or the finished product is unqualified and take place.

It should be understood that the modes one and two adopt a numerical control mode, so that the diameter of the outer diameters of the two ends of the workpiece (once or more times, specifically according to the size requirement of the diameter reduction) can be reduced on the workpiece (steel pipe 5 or steel bar) in a numerical control mode through the rolling wheels 623 on the chuck 62.

Referring to fig. 5, a preheating assembly 7 before shrinking the steel tube 5 is further included, which includes: the steel pipe cutting device comprises an electric rolling mechanism 71 used for conveying a cut steel pipe 5, a high-temperature resistant cylinder 72 used for receiving the steel pipe 5 conveyed by the electric rolling mechanism 71, a medium-frequency heating coil 721 wound on the outer wall of the high-temperature resistant cylinder 72 and electrically connected with a medium-frequency heater 722, a movable baffle 73 arranged at the bottom of the high-temperature resistant cylinder 72 and fixedly connected with the output end of a drawing cylinder 731, a lifting cylinder 74 arranged below the baffle 73, and a supporting plate 741 capable of extending to the bottom of the high-temperature resistant cylinder 72 and fixedly connected with the output end of the lifting cylinder 74, wherein the steel pipe cutting device further comprises a moving mechanism 75 which is provided with a feeding clamp 751 and is used for clamping the steel pipe 5 and conveying the steel pipe 5 into a clamping mechanism 4 through the feeding clamp 751.

Specifically, the working principle of the feeding and discharging device for the steel pipe 5 or the steel bar is as follows:

firstly, placing a steel pipe 5 or a steel bar workpiece which is well fed on an electric rolling mechanism 71, wherein the steel pipe or the steel bar workpiece can be placed more than once;

the workpiece automatically moves forwards;

when the workpiece moves to the upper part of the high-temperature resistant cylinder 72 in the intermediate frequency heating coil 721, the workpiece automatically falls into the high-temperature resistant cylinder 72;

after 1 minute, when the workpiece is heated to 860 ℃, the lifting air cylinder 74 moves the supporting plate 741 to ascend to reach the position with the appointed height and stop;

the drawing cylinder 731 acts; the baffle plate 73 is moved away from the lower bottom surface of the high-temperature resistant cylinder 72, and the heated workpiece is lowered onto the supporting plate 741;

the lifting cylinder 74 descends until the upper plane of the workpiece leaves the bottom surface of the high-temperature resistant cylinder 72 of the medium-frequency heating coil 721, and the drawing cylinder 731 acts to push the baffle plate 73 to return to the original position;

the feeding clamp 751 is used for clamping a steel pipe 5 or a steel bar and conveying the steel pipe 5 or the steel bar into the clamping mechanism 4 (referring to fig. 5, a clamp for clamping the heated steel pipe 5 or the heated steel bar is arranged at the front end of the feeding clamp 751, and the heated steel pipe 5 or the heated steel bar can be effectively clamped by the clamp, so that the steel pipe 5 or the heated steel bar can be conveyed to the clamping mechanism 4 conveniently);

the electric rolling mechanism 71 acts to move the workpiece forward by one workpiece position;

the next workpiece enters the high temperature resistant cylinder 72 in the intermediate frequency heating coil 721 to be heated continuously;

after 1 minute, when the workpiece is heated to 860 ℃, the workpiece is automatically discharged (wherein, in the embodiment, the preferred temperature is 860 degrees, but the scheme is not limited to the accurate value of 860 degrees, the preferred temperature range for heating the workpiece is 860 degrees to 900 degrees, and the workpiece in the temperature range can be automatically discharged); and repeating the work.

In addition, in the present embodiment, the heating device of the workpiece is provided with a temperature control system controlled by a program;

1) when the workpiece in the heating device is heated to 900 ℃, the device can automatically cut off the heating operation of the device on the workpiece through a temperature control system;

2) when the temperature of the workpiece in the heating device is reduced to 860 degrees, the device can be automatically started by the temperature control system to heat the workpiece, so that the temperature of the workpiece is always kept between 860 degrees and 900 degrees.

3) The foregoing embodiment shows that the apparatus may further include a device for performing secondary heating (continuous heating) on the workpiece, and preferably, two medium frequency heating coils are disposed opposite to the apparatus, when the workpiece is reduced in diameter and the temperature of the workpiece is lower than 800 ℃, the reducing stress is large and the workpiece is not pulled and reduced, at this time, the reducing mechanism moves to two ends of the table top of the apparatus, at this time, the clamping upper mold is opened, the central ejector rod of the clamping lower mold jacks up the workpiece (in order to reduce the heated integrated body), the left coil and the right coil can automatically extend out to two ends of the workpiece, the workpiece is sleeved and moved horizontally in place, the power is automatically connected to heat the workpiece, when the workpiece is increased to 860-.

The working principle and the using process of the utility model are as follows: after the utility model is installed:

firstly, placing a steel pipe 5 (or a steel bar) workpiece which is fed well on an electric rolling mechanism 71, wherein the workpiece can be placed more than once, the workpiece automatically moves forwards, when the workpiece moves to the position above a high-temperature resistant cylinder 72 in a medium-frequency heating coil 721, the workpiece automatically falls into the high-temperature resistant cylinder 72, after 1 minute, when the workpiece is heated to 860 ℃, a lifting cylinder 74 acts on a supporting plate 741, the supporting plate 741 rises to reach a specified height position and stops, and a drawing cylinder 731 acts; the baffle plate 73 is moved away from the lower bottom surface of the high-temperature resistant cylinder 72, the heated workpiece is lowered onto the supporting plate 741, the lifting cylinder 74 is lowered to the position that the upper plane of the workpiece is away from the bottom surface of the high-temperature resistant cylinder 72 of the medium-frequency heating coil 721, the drawing cylinder 731 acts to push the baffle plate 73 to return, the steel pipe 5 or the steel bar is clamped by the feeding clamp 751 to be conveyed into the clamping mechanism 4, the electric rolling mechanism 71 acts to move the workpiece forward by one workpiece position, the next workpiece enters the high-temperature resistant cylinder 72 in the medium-frequency heating coil 721 to be continuously heated, the workpiece is automatically discharged when the temperature of the workpiece is 860 ℃ after 1 minute, and the work is repeated.

After the heated steel pipe 5 or steel bar is conveyed to the table top 1 of the device, the clamping die on the starting button is pressed downwards, the reducing mechanisms 6 at the two ends of the steel pipe 5 or steel bar synchronously and automatically reach the position 9mm (the diameter value is determined according to the reducing requirement of the steel pipe or steel bar) of the central position of the length of the steel pipe 5 to stop, the two chucks 62 automatically rotate, the two clamping heads automatically reduce towards the pipe center, the reducing mechanisms 6 at the two ends of the steel pipe 5 or steel bar automatically move backwards to the tail part (the distance can be set) of the steel pipe 5, the reducing mechanisms 6 at the two ends of the steel pipe 5 automatically reach the middle position of the steel pipe 5 or steel bar to stop, the chucks 62 automatically rotate, and the clamping heads automatically reduce towards the pipe center; repeating the process for multiple times (the reducing size is according to the reducing requirement) until the diameter of the steel pipe 5 or the steel bar is 40mm (the reducing size is according to the reducing requirement), automatically stopping the reducing mechanism 6 at two ends of the mechanism when the two ends of the steel pipe 5 or the steel bar are drawn to the diameter of 40mm (the reducing size is according to the reducing requirement), automatically lifting the upper pressing die cylinder upwards, and taking out the steel pipe 5 or the steel bar after being reduced.

In addition, the present embodiment also provides a second diameter reduction manner, wherein the lifting clamp 42 is provided as a rotatable member, which clamps the steel pipe or steel bar 5 and then rotates the steel pipe or steel bar; rotating, and reducing the diameter of the two ends of the steel pipe or the steel bar 5 by the steel pipe or steel bar reducing mechanisms 6 positioned at the two sides.

In addition, the embodiment also provides a third mode and a fourth mode, wherein the middle of the steel pipe or the steel bar is clamped by a hollow shell mold; extruding and reducing the diameter of the two ends from the oil cylinder to the middle, selecting a material with a proper diameter, heating the material, then extruding the material by the oil cylinder to the middle of the workpiece to form a die with the two ends, wherein the die in the middle is larger than the material in diameter, processing a hollow shell die larger than the material according to the design requirement, and extruding the redundant material to directly enter the hollow shell die in the middle; (the third is a parallel extrusion type; the fourth is a vertical extrusion type).

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the utility model, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.

Claims (7)

1. The utility model provides a thick wall heating steel pipe both ends spinning draw steel pipe undergauge device which characterized in that includes:

a device table top (1);

an upright post (2) is vertically arranged on one side wall of the device table board (1), and a supporting plate (3) parallel to the device table board (1) is fixedly connected with the top end of the upright post (2) in a vertical way;

a part of clamping mechanism (4) extending to the center of the device table board (1) is fixedly arranged on the supporting plate (3), and the clamping mechanism (4) is used for clamping a steel pipe (5);

be located steel pipe (5) both sides device mesa (1) is gone up and is respectively provided with reducing mechanism (6) slidable relatively, through both sides reducing mechanism (6) are used for realizing right the corresponding tip of steel pipe (5) carries out the reducing processing.

2. A thick-walled heating steel pipe both-end spinning and reducing steel pipe diameter reducing device as claimed in claim 1, wherein said clamping mechanism (4) comprises:

the pressing oil cylinder (41) is fixedly connected to the top of the supporting plate (3);

the output end of the pressing oil cylinder (41) penetrates through the supporting plate (3) and is fixedly connected with a lifting clamp (42);

the steel pipe (5) is detachably and fixedly connected to the lifting clamp (42);

and a fixed clamping die (43) capable of bearing the lifting clamp (42) is further arranged at the top of the device table board (1) corresponding to the supporting plate (3).

3. A thick-walled heating steel pipe both-end spinning and drawing steel pipe diameter reducing device as claimed in claim 1, wherein each diameter reducing mechanism (6) comprises:

the mounting seat (61) is arranged on one side of the clamping mechanism (4);

a chuck (62) is rotatably arranged on one side end face, close to the steel pipe (5), of the mounting seat (61), three moving teeth (621) are uniformly distributed on the chuck (62) at equal angles, a clamping jaw (622) is slidably arranged in each moving tooth (621), and a rolling wheel (623) abutted against the outer wall of the steel pipe (5) is rotatably arranged on each clamping jaw (622);

the top of the mounting seat (61) is provided with a rotating motor (63), the output end of the rotating motor is fixedly connected with a driving wheel (631), and a chain is in transmission connection between the driving wheel (631) and the chuck (62);

and an extrusion motor (64) is fixedly connected to the outer wall of one end, far away from the steel pipe (5), of the mounting seat (61), and the output end of the extrusion motor is connected to the plurality of clamping jaws (622) in a matching mode.

4. The thick-walled heating steel pipe two-end spinning and drawing steel pipe diameter reducing device according to claim 3, characterized in that a plurality of square guide rails (65) are symmetrically arranged on the device table top (1) at two sides of the clamping mechanism (4), and square slide blocks (611) which are matched one by one are arranged at the bottom of the mounting base (61) corresponding to the square guide rails (65);

wherein, still be provided with in mount pad (61) and draw motor (66), the rigid coupling has lead screw (661) on its output, just lead screw (661) with mount pad (61) mutually support.

5. A thick-walled heating steel pipe both-end spinning and drawing steel pipe diameter reducing device as claimed in claim 4, characterized in that a fixed steel bar (67) is embedded and fixed at the center of the chuck (62).

6. A thick-walled heating steel pipe both-end spinning and drawing steel pipe diameter reducing device as claimed in claim 5, characterized in that one end of each square guide rail (65) close to the clamping mechanism (4) is provided with a front limiting member, and one end far away from the clamping mechanism (4) is provided with a rear limiting member, through which the displacement distance of the mounting seat (61) is limited.

7. A thick-walled heating steel pipe both-end spinning and drawing steel pipe diameter reducing device according to claim 1, further comprising a preheating assembly (7) before reducing the steel pipe (5), comprising:

an electric rolling mechanism (71) for conveying the cut steel pipe (5);

the high-temperature resistant cylinder (72) is used for receiving the steel pipe (5) conveyed by the electric rolling mechanism (71), a medium-frequency heating coil (721) is wound on the outer wall of the high-temperature resistant cylinder (72), and the medium-frequency heating coil (721) is electrically connected with the medium-frequency heater (722);

a movable baffle (73) is arranged at the bottom of the high-temperature resistant cylinder (72), and the baffle (73) is fixedly connected with the output end of the drawing cylinder (731);

a lifting cylinder (74) is further arranged below the baffle (73), and a supporting plate (741) capable of extending to the bottom of the high-temperature resistant cylinder (72) is fixedly connected to the output end of the lifting cylinder (74);

the steel pipe clamping device further comprises a moving mechanism (75), wherein a feeding clamp (751) is arranged in the moving mechanism, and the feeding clamp (751) is used for clamping the steel pipe (5) and conveying the steel pipe into the clamping mechanism (4).

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