CN103861909B - With bending roll range sensor and destressing heat treated U-shaped crooking of the tubes technique - Google Patents

With bending roll range sensor and destressing heat treated U-shaped crooking of the tubes technique Download PDF

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Publication number
CN103861909B
CN103861909B CN201410131657.1A CN201410131657A CN103861909B CN 103861909 B CN103861909 B CN 103861909B CN 201410131657 A CN201410131657 A CN 201410131657A CN 103861909 B CN103861909 B CN 103861909B
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fixture
bending
boiler tube
dipper crowding
crowding gear
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CN103861909A (en
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汪贤女
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Jinchuan Yangzhou surface treatment Co., Ltd.
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汪贤女
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Abstract

A kind of U-shaped furnace tubing bending machining technique, it uses a kind of crooking of the tubes equipment, described crooking of the tubes equipment comprises left frame and dipper crowding gear, dipper crowding gear is in left frame right, guide rod is fixedly installed in the right side middle position of described left frame, guide rod is horizontal-extending in the lateral direction, the left end of guide rod is fixedly connected with described left frame, the right-hand member of guide rod and the middle part of dipper crowding gear are slidably connected, be provided with in described left frame for original U-shaped boiler tube material loading through and the passage that passes through of boiler tube discharging for completing processing; Described guide rod slides successively from left to right between described left frame and dipper crowding gear and is provided with three bending hydraulic means.

Description

With bending roll range sensor and destressing heat treated U-shaped crooking of the tubes technique
Technical field
The application relates to the making of heating furnace tube, is specially a kind of U-shaped heating furnace tube bending process.
Background technology
Heating furnace has a wide range of applications in the industry, such as heating steel billet, heat treatment of workpieces etc.In order to increase the heating uniformity of heating furnace, heating furnace tube is often in a bent form.
In the prior art, in order to ensure the requirement of concrete heating furnace shape and meet the requirement respectively of concrete heating heat, usually need to carry out the bending of concrete shape to the shape of boiler tube.Bending for heating furnace tube, often adopts stamping forming mode in the prior art.This molding mode efficiently can realize bending machining rapidly, and machining accuracy is high, and cost is lower, has extensive use in the prior art.But, this mode of heating easily produces significantly a large amount of inhomogeneous deformations on the longitudinal direction of heating furnace tube, the cross-sectional area of heating furnace tube is caused to have larger variation on the longitudinal direction of boiler tube, this makes heating uniformity in heating process be difficult to control, and, easily in the process used, produce uneven stress to concentrate, thus cause the stability in use of heating furnace, security greatly reduces, and shortens the service life of heating furnace.
Also have in the prior art and use bending to roll the scheme bent workpiece.But, this scheme often adopts curved bending one by one to workpiece, because the longitudinal size of workpiece is comparatively large, in the complete rotation process of workpiece, this processing often needs larger processing space, and, because process is adopt mode curved one by one, process is longer, and working (machining) efficiency is lower, cause processing cost to rise thus, and be difficult to the form accuracy ensureing processing.
Summary of the invention
A kind of U-shaped heating furnace tube of the present invention bending process, it is intended to solve the defects such as machining deformation in prior art is uneven and process is long, form accuracy is low, and provides a kind of bending process with the heating furnace tube of concrete shape.
The technical solution used in the present invention is as follows:
A kind of use bending roll range sensor also carries out destressing heat treated U-shaped furnace tubing bending machining technique, it uses a kind of crooking of the tubes equipment, described crooking of the tubes equipment comprises left frame and dipper crowding gear, dipper crowding gear is in left frame right, guide rod is fixedly installed in the right side middle position of described left frame, guide rod is horizontal-extending in the lateral direction, the left end of guide rod is fixedly connected with described left frame, the right-hand member of guide rod and the middle part of dipper crowding gear are slidably connected, be provided with in described left frame for original U-shaped boiler tube material loading through and the passage that passes through of boiler tube discharging for completing processing, described guide rod slides successively from left to right between described left frame and dipper crowding gear and is provided with three bending hydraulic means, the front portion, left side of dipper crowding gear is fixedly installed the first fixture, the left back of dipper crowding gear is fixedly installed the second fixture, the right front of left frame is fixedly installed the 3rd fixture, the rear portion, right side of left frame is fixedly installed the 4th fixture, fromer rail and rear rail is provided with between described left frame and dipper crowding gear, described fromer rail straight line between the 3rd fixture and the first fixture extends, and when dipper crowding gear slides along described guide rod, first fixture can slide along fromer rail towards the 3rd fixture, described rear rail straight line between the 4th fixture and the second fixture extends, and when dipper crowding gear slides along described guide rod, second fixture can slide along rear rail towards the 4th fixture, described rear rail is also provided with the 5th fixture and the 6th fixture slidably between the 4th fixture and the second fixture, described fromer rail is also provided with the 7th fixture and the 8th fixture slidably between the 3rd fixture and the first fixture, eight described fixtures include clip base, internal clamping block and outer fixture block, the described internal clamping block of each described fixture and outer fixture block are all relatively arranged along the fore-and-aft direction in the plane of bending when described boiler tube generation plain bending, and contact gripping can be realized and be separated the action of unclamping in clip base, wherein, described internal clamping block is all between described fromer rail and rear rail, and be rectangular shape, described outer fixture block is all positioned at outside described fromer rail and rear rail, and be cylindrical shape, the longitudinal axis of described rectangular shape and cylindrical shape is all perpendicular to plane of bending during described boiler tube generation plain bending, wherein, the right flank of the internal clamping block of described 3rd fixture and the 4th fixture is provided with the right extension limited block extended to the right, the left surface of the internal clamping block of described first fixture and the second fixture is provided with the left extension limited block extended to the left, the left and right side of the internal clamping block of described 5th fixture, the 6th fixture, the 7th fixture and the 8th fixture is provided with respectively the left extension limited block extended to the left and the right extension limited block extended to the right.
Middle part and the described guide rod of described three bending hydraulic means are slidably matched, each in described three bending hydraulic means includes opposed front wheel driving hydraulic cylinder and rear drive hydraulic cylinder, described front wheel driving hydraulic cylinder and rear drive hydraulic cylinder are symmetrical arranged relative to the longitudinal axis of guide rod, the hydraulic stem end of described front wheel driving hydraulic cylinder is hinged with antecurvature curved roll, and front wheel driving hydraulic cylinder can drive antecurvature curved roll applying bend pipe thrust forward along the direction vertical with guide rod, the hydraulic stem end of described rear drive hydraulic cylinder is hinged with rear bending roll, and rear drive hydraulic cylinder can drive rear bending roll applying bend pipe thrust backward along the direction vertical with guide rod, each in described three bending hydraulic means all also comprises hoofing part mechanism, slides into diverse location in order to drive corresponding bending hydraulic means respectively along guide rod, in described three bending hydraulic means the bending roll of each bending hydraulic means pivotal axis near be provided with bending roll range sensor, described bending roll range sensor can detect the pivotal axis of bending roll and the distance of bending roll both sides fixture respectively, the range information that described hoofing part mechanism can provide according to described bending roll range sensor controls the position of respective curved hydraulic means, with the centre position making the bending roll of respective curved hydraulic means occupy adjacent two fixtures, described bending roll range sensor is optical pickocff, hall effect sensor or magnetic field sensor.
The right side of described dipper crowding gear is provided with front support rod telescoping mechanism and back support rod telescoping mechanism, front support rod telescoping mechanism and back support rod telescoping mechanism are arranged symmetrically about the longitudinal axis of described guide rod, front support rod telescoping mechanism has front stretching support bar, front stretching support bar can be used in extending in described boiler tube through the left side leaving dipper crowding gear from the right side of dipper crowding gear, thus play the effect supporting boiler tube and prevent boiler tube generation undesirably bending, and can move back and forth in the lateral direction under the driving of front support rod telescoping mechanism; Back support rod telescoping mechanism has rear retractility support bar, rear retractility support bar can be used in extending in described boiler tube through the left side leaving dipper crowding gear from the right side of dipper crowding gear, thus play the effect supporting boiler tube and prevent boiler tube generation undesirably bending, and can move back and forth in the lateral direction under the driving of back support rod telescoping mechanism.
Described U-shaped furnace tubing bending machining technique comprises the steps:
A., U-shaped boiler tube is provided;
B. two arms of described U-shaped boiler tube penetrated respectively the described passage on described left frame and advance to the right, until the part that described U-shaped boiler tube will be processed stretches out in described left frame;
C. described second fixture and the 4th fixture are respectively by two arm clampings of described U-shaped boiler tube;
D. dipper crowding gear motion, with the end making the first fixture and the second fixture clamp two arms of U-shaped boiler tube respectively;
E. the 5th fixture and the 6th fixture clamp the postbrachium of U-shaped boiler tube between the 4th fixture and the second fixture, and make the 4th fixture, the 5th fixture, the 6th fixture and the second fixture the described postbrachium of U-shaped boiler tube is separated into three equal length sections of length; 7th fixture and the 8th fixture clamp the forearm of U-shaped boiler tube between the second fixture and the first fixture, and make the second fixture, the 7th fixture, the 8th fixture and the first fixture the described forearm of U-shaped boiler tube is separated into three equal length sections of length;
F. each in described three bending hydraulic means make its front and rear curved roller, contact on described forearm and postbrachium described three length sections respectively in the mid point of corresponding each length section;
G. rear retractility support bar and front stretching support bar stretch in the described postbrachium of U-shaped boiler tube and the pipe of forearm by the back support rod telescoping mechanism of dipper crowding gear and front support rod telescoping mechanism accordingly respectively, and first length section from left to right stayed in described three length sections of each arm is not supported, from left to right second and the 3rd length section supported;
H. each bending roll of the bending hydraulic means in left side synchronously starts outwards described first length section of top pressure, thus make it that U-bend song occur, dipper crowding gear synchronously follows pushing along with bending carrying out, meanwhile, the 5th fixture, the 6th fixture, the 7th fixture, the also synchronously accompany movement of the 8th fixture; In the process of top pressure, the bending hydraulic means in left side to left movement, thus makes its bending roll keep corresponding to the position of described first length section mid point under the driving of its hoofing part mechanism; To the right extension limited block of the 4th fixture and the left extension limited block of the 5th fixture contact and the right extension limited block of the 3rd fixture contacts with the left extension limited block of the 7th fixture time, each bending roll of the bending hydraulic means in described left side stops top pressure, and dipper crowding gear stops continuing urged forward;
I. rear retractility support bar and front stretching support bar bounce back by the back support rod telescoping mechanism of dipper crowding gear and front support rod telescoping mechanism accordingly respectively, thus first length section from left to right making to stay in described three length sections of each arm and from left to right second length section are not all supported, the 3rd length section is supported from left to right;
J. the bending hydraulic means in the middle of starts second length section from left to right described in the pressure of top, until the right extension limited block of the 5th fixture contacts with the left extension limited block of the 6th fixture and the right extension limited block of the 7th fixture contacts with the left extension limited block of the 8th fixture;
K. dipper crowding gear makes described support bar, bounces back completely, is not supported to make the 3rd length section from left to right;
L. the bending hydraulic means on right side starts the 3rd length section from left to right described in the pressure of top, until the right extension limited block of the 6th fixture contacts with the left extension limited block of the second fixture and the right extension limited block of the 8th fixture contacts with the left extension limited block of the first fixture;
M. each fixture unclamps, and takes the heating furnace tube that bending machining is complete away;
N. heating furnace tube complete for bending machining is put into destressing heat-treatment furnace and carry out stress relief annealing, the process conditions of annealing are: holding temperature degree Celsius, temperature retention time hour.
Due in the present invention, each fixture have employed extension limited block, thus after limited block is contacted, a locking can be carried out to shaping shape, under the effect of follow-up elaboration power, can not the shape after precise forming be impacted, and to have employed be cuboid while be columniform fixture, while making to ensure that enough clamping forces, level and smooth flexural deformation can be formed to the boiler tube be shaped again, whole process, while in longitudinal direction feeding, while utilize bending rolling work to carry out bending, therefore, to which obviate in prior art on the longitudinal direction of boiler tube process the problem that bending position produces larger linear deformation, and, in process, it adopts unique form processing, feeding on one side, bending roll carries out action and moves on parallel longitudinal direction direction in vertical longitudinal direction, thus keep the relative position relation of bending roll and institute's crooked position, and boiler tube is longitudinally sent under the moving integrally of other clamping devices, therefore, ensure that boiler tube entirety keeps longitudinal direction and bent one by one, whole BENDING PROCESS is continuous, without the need to repeating, clamping and dismounting are carried out to boiler tube, make whole process processing space little, process is short and ensure that the form accuracy of processing.And multiple fixture can slide in process, ensure that the locking all the time boiler tube in process to clamping position.
Accompanying drawing explanation
Fig. 1 is the schematic top plan view of bending apparatus of the present invention.
Fig. 2 is the schematic top plan view of bending apparatus after completing the crooking of the tubes in Fig. 1 of the present invention.
Fig. 3 is the schematic top plan view of the boiler tube shape after having bent.
Detailed description of the invention
Below in conjunction with accompanying drawing 1-3, the present invention is described in detail.
A kind of use bending roll range sensor also carries out destressing heat treated U-shaped furnace tubing bending machining technique, it uses a kind of crooking of the tubes equipment, described crooking of the tubes equipment comprises left frame 13 and dipper crowding gear 10, dipper crowding gear 10 is in left frame 13 right, guide rod 15 is fixedly installed in the right side middle position of described left frame 13, guide rod 15 horizontal-extending in the lateral direction, the left end of guide rod 15 is fixedly connected with described left frame 13, the right-hand member of guide rod 15 and the middle part of dipper crowding gear 10 are slidably connected, be provided with in described left frame 13 for original U-shaped boiler tube material loading through and the passage that passes through of boiler tube discharging for completing processing, described guide rod 15 slides successively from left to right between described left frame 13 and dipper crowding gear 10 and is provided with three bending hydraulic means 9, the front portion, left side of dipper crowding gear 10 is fixedly installed the first fixture 1, the left back of dipper crowding gear 10 is fixedly installed the second fixture 5, the right front of left frame 13 is fixedly installed the 3rd fixture 4, the rear portion, right side of left frame 13 is fixedly installed the 4th fixture 8, fromer rail and rear rail is provided with between described left frame 13 and dipper crowding gear 10, described fromer rail straight line between the 3rd fixture 4 and the first fixture 1 extends, and when dipper crowding gear 10 slides along described guide rod 15, first fixture 1 can slide along fromer rail towards the 3rd fixture 4, described rear rail straight line between the 4th fixture 8 and the second fixture 5 extends, and when dipper crowding gear 10 slides along described guide rod 15, second fixture 5 can slide along rear rail towards the 4th fixture 8, described rear rail is also provided with the 5th fixture 7 and the 6th fixture 6 slidably between the 4th fixture 8 and the second fixture 5, described fromer rail is also provided with the 7th fixture 3 and the 8th fixture 2 slidably between the 3rd fixture 4 and the first fixture 1, eight described fixtures 1, 2, 3, 4, 5, 6, 7, 8 include clip base, internal clamping block 81, 41 and outer fixture block 82, 42, the described internal clamping block 81 of each described fixture, 41 and outer fixture block 82, 42 are all relatively arranged along the fore-and-aft direction in the plane of bending when described boiler tube generation plain bending, and contact gripping can be realized and be separated the action of unclamping in clip base, wherein, described internal clamping block 81, 41 all between described fromer rail and rear rail, and be rectangular shape, described outer fixture block 82, 42 are all positioned at outside described fromer rail and rear rail, and be cylindrical shape, the longitudinal axis of described rectangular shape and cylindrical shape is all perpendicular to plane of bending during described boiler tube generation plain bending, wherein, the right flank of the internal clamping block of described 3rd fixture 4 and the 4th fixture 8 is provided with the right extension limited block 83,43 extended to the right, the left surface of the internal clamping block of described first fixture 1 and the second fixture 5 is provided with the left extension limited block 54,14 extended to the left, the left and right side of the internal clamping block of described 5th fixture 7, the 6th fixture 6, the 7th fixture 3 and the 8th fixture 2 is provided with respectively the left extension limited block extended to the left and the right extension limited block extended to the right.
Middle part and the described guide rod 15 of described three bending hydraulic means 9 are slidably matched, each in described three bending hydraulic means 9 includes opposed front wheel driving hydraulic cylinder and rear drive hydraulic cylinder, described front wheel driving hydraulic cylinder and rear drive hydraulic cylinder are symmetrical arranged relative to the longitudinal axis of guide rod 15, the hydraulic stem end of described front wheel driving hydraulic cylinder is hinged with antecurvature curved roll 91, and front wheel driving hydraulic cylinder can drive the bend pipe thrust applying forward to antecurvature curved roll 91 along the direction vertical with guide rod 15, the hydraulic stem end of described rear drive hydraulic cylinder is hinged with rear bending roll 90, and rear drive hydraulic cylinder can drive the bend pipe thrust applying backward to rear bending roll 90 along the direction vertical with guide rod 15, each in described three bending hydraulic means 9 all also comprises hoofing part mechanism, slides into diverse location in order to drive corresponding bending hydraulic means 9 respectively along guide rod 15, in described three bending hydraulic means 9 bending roll of each bending hydraulic means 9 pivotal axis near be provided with bending roll range sensor, described bending roll range sensor can detect the pivotal axis of bending roll and the distance of bending roll both sides fixture respectively, the range information that described hoofing part mechanism can provide according to described bending roll range sensor controls the position of respective curved hydraulic means 9, with the centre position making the bending roll of respective curved hydraulic means 9 occupy adjacent two fixtures, described bending roll range sensor is optical pickocff, hall effect sensor or magnetic field sensor.
The right side of described dipper crowding gear 10 is provided with front support rod telescoping mechanism 12 and back support rod telescoping mechanism 11, front support rod telescoping mechanism 12 and back support rod telescoping mechanism 11 are arranged symmetrically about the longitudinal axis of described guide rod 15, front support rod telescoping mechanism 12 has front stretching support bar 120, front stretching support bar 120 can be used in extending in described boiler tube through the left side leaving dipper crowding gear 10 from the right side of dipper crowding gear 10, thus play the effect supporting boiler tube and prevent boiler tube generation undesirably bending, and can move back and forth in the lateral direction under the driving of front support rod telescoping mechanism 12, back support rod telescoping mechanism 11 has rear retractility support bar 110, rear retractility support bar 110 can be used in extending in described boiler tube through the left side leaving dipper crowding gear 10 from the right side of dipper crowding gear 10, thus play the effect supporting boiler tube and prevent boiler tube generation undesirably bending, and can move back and forth in the lateral direction under the driving of back support rod telescoping mechanism 11.
Described U-shaped furnace tubing bending machining technique comprises the steps:
A., U-shaped boiler tube 19 is provided;
B. two arms of described U-shaped boiler tube penetrated respectively the described passage on described left frame 13 and advance to the right, until the part that described U-shaped boiler tube will be processed stretches out in described left frame 13;
C. described second fixture 5 and the 4th fixture 8 are respectively by two arm clampings of described U-shaped boiler tube;
D. dipper crowding gear 10 moves, with the end making the first fixture 1 and the second fixture 5 clamp two arms of U-shaped boiler tube respectively;
E. the 5th fixture 7 and the 6th fixture 6 clamp the postbrachium of U-shaped boiler tube between the 4th fixture 8 and the second fixture 5, and make the 4th fixture 8, the 5th fixture 7, the 6th fixture 6 and the second fixture 5 the described postbrachium of U-shaped boiler tube is separated into three equal length sections of length; 7th fixture 3 and the 8th fixture 2 clamp the forearm of U-shaped boiler tube between the second fixture 5 and the first fixture 1, and make the second fixture 5, the 7th fixture 3, the 8th fixture 2 and the first fixture 1 the described forearm of U-shaped boiler tube is separated into three equal length sections of length;
F. the mid point of corresponding each length section in described three length sections that each in described three bending hydraulic means 9 makes its front and rear curved roller 91,90 contact on described forearm and postbrachium respectively;
G. rear retractility support bar 110 and front stretching support bar 120 stretch in the described postbrachium of U-shaped boiler tube and the pipe of forearm by the back support rod telescoping mechanism 11 of dipper crowding gear 10 and front support rod telescoping mechanism 12 accordingly respectively, and first length section from left to right stayed in described three length sections of each arm is not supported, from left to right second and the 3rd length section supported;
H. each bending roll of the bending hydraulic means 9 in left side synchronously starts outwards described first length section of top pressure, thus make it that U-bend song occur, dipper crowding gear 10 synchronously follows pushing along with bending carrying out, meanwhile, the 5th fixture 7, the 6th fixture 6, the 7th fixture 3, the also synchronously accompany movement of the 8th fixture 2; In the process of top pressure, the bending hydraulic means 9 in left side to left movement, thus makes its bending roll keep corresponding to the position of described first length section mid point under the driving of its hoofing part mechanism; To the right extension limited block 83 of the 4th fixture 8 and the left extension limited block of the 5th fixture 7 contact and the right extension limited block 43 of the 3rd fixture 4 contacts with the left extension limited block of the 7th fixture 3 time, each bending roll of the bending hydraulic means 9 in described left side stops top pressure, and dipper crowding gear 10 stops continuing urged forward;
I. rear retractility support bar 110 and front stretching support bar 120 bounce back by the back support rod telescoping mechanism 11 of dipper crowding gear 10 and front support rod telescoping mechanism 12 accordingly respectively, thus first length section from left to right making to stay in described three length sections of each arm and from left to right second length section are not all supported, the 3rd length section is supported from left to right;
J. the bending hydraulic means 9 in the middle of starts second length section from left to right described in the pressure of top, until the right extension limited block of the 5th fixture 7 contacts with the left extension limited block of the 6th fixture 6 and the right extension limited block of the 7th fixture 3 contacts with the left extension limited block of the 8th fixture 2;
K. dipper crowding gear 10 makes described support bar 110,120 bounce back completely, is not supported to make the 3rd length section from left to right;
L. the bending hydraulic means 9 on right side starts the 3rd length section from left to right described in the pressure of top, until the right extension limited block of the 6th fixture 6 contacts with the left extension limited block of the second fixture 5 and the right extension limited block of the 8th fixture 2 contacts with the left extension limited block of the first fixture 1;
M. each fixture unclamps, and takes the heating furnace tube that bending machining is complete away;
N. heating furnace tube complete for bending machining is put into destressing heat-treatment furnace and carry out stress relief annealing, the process conditions of annealing are: holding temperature 300 degrees Celsius, temperature retention time 3 hours.

Claims (1)

1. one kind uses bending roll range sensor and carries out destressing heat treated U-shaped furnace tubing bending machining technique, it uses a kind of crooking of the tubes equipment, described crooking of the tubes equipment comprises left frame (13) and dipper crowding gear (10), dipper crowding gear (10) is in left frame (13) right, guide rod (15) is fixedly installed in the right side middle position of described left frame (13), guide rod (15) horizontal-extending in the lateral direction, the left end of guide rod (15) is fixedly connected with described left frame (13), the right-hand member of guide rod (15) and the middle part of dipper crowding gear (10) are slidably connected, be provided with in described left frame (13) for original U-shaped boiler tube material loading through and the passage that passes through of boiler tube discharging for completing processing, described guide rod (15) slides successively from left to right between described left frame (13) and dipper crowding gear (10) and is provided with three bending hydraulic means (9), the front portion, left side of dipper crowding gear (10) is fixedly installed the first fixture (1), the left back of dipper crowding gear (10) is fixedly installed the second fixture (5), the right front of left frame (13) is fixedly installed the 3rd fixture (4), the rear portion, right side of left frame (13) is fixedly installed the 4th fixture (8), fromer rail and rear rail is provided with between described left frame (13) and dipper crowding gear (10), described fromer rail straight line between the 3rd fixture (4) and the first fixture (1) extends, and when dipper crowding gear (10) slides along described guide rod (15), first fixture (1) can slide along fromer rail towards the 3rd fixture (4), described rear rail straight line between the 4th fixture (8) and the second fixture (5) extends, and when dipper crowding gear (10) slides along described guide rod (15), second fixture (5) can slide along rear rail towards the 4th fixture (8), described rear rail is also provided with the 5th fixture (7) and the 6th fixture (6) slidably between the 4th fixture (8) and the second fixture (5), described fromer rail is also provided with the 7th fixture (3) and the 8th fixture (2) slidably between the 3rd fixture (4) and the first fixture (1), eight described fixtures (1, 2, 3, 4, 5, 6, 7, 8) clip base is included, internal clamping block (81, 41) and outer fixture block (82, 42), the described internal clamping block (81 of each described fixture, 41) and outer fixture block (82, 42) all relatively arrange along the fore-and-aft direction in the plane of bending when described boiler tube generation plain bending, and contact gripping can be realized and be separated the action of unclamping in clip base, wherein, described internal clamping block (81, 41) all between described fromer rail and rear rail, and be rectangular shape, described outer fixture block (82, 42) be all positioned at outside described fromer rail and rear rail, and be cylindrical shape, the longitudinal axis of described rectangular shape and cylindrical shape is all perpendicular to plane of bending during described boiler tube generation plain bending, wherein, the right flank of the internal clamping block of described 3rd fixture (4) and the 4th fixture (8) is provided with the right extension limited block (83,43) extended to the right, the left surface of the internal clamping block of described first fixture (1) and the second fixture (5) is provided with the left extension limited block (54,14) extended to the left, the left and right side of the internal clamping block of described 5th fixture (7), the 6th fixture (6), the 7th fixture (3) and the 8th fixture (2) is provided with respectively the left extension limited block extended to the left and the right extension limited block extended to the right,
Middle part and the described guide rod (15) of described three bending hydraulic means (9) are slidably matched, each in described three bending hydraulic means (9) includes opposed front wheel driving hydraulic cylinder and rear drive hydraulic cylinder, described front wheel driving hydraulic cylinder and rear drive hydraulic cylinder are symmetrical arranged relative to the longitudinal axis of guide rod (15), the hydraulic stem end of described front wheel driving hydraulic cylinder is hinged with antecurvature curved roll (91), and front wheel driving hydraulic cylinder can drive the bend pipe thrust applying forward to antecurvature curved roll (91) along the direction vertical with guide rod (15), the hydraulic stem end of described rear drive hydraulic cylinder is hinged with rear bending roll (90), and rear drive hydraulic cylinder can drive the bend pipe thrust applying backward to rear bending roll (90) along the direction vertical with guide rod (15), each in described three bending hydraulic means (9) all also comprises hoofing part mechanism, slides into diverse location in order to drive corresponding bending hydraulic means (9) respectively along guide rod (15), in described three bending hydraulic means (9) bending roll of each bending hydraulic means (9) pivotal axis near be provided with bending roll range sensor, described bending roll range sensor can detect the pivotal axis of bending roll and the distance of bending roll both sides fixture respectively, the range information that described hoofing part mechanism can provide according to described bending roll range sensor controls the position of respective curved hydraulic means (9), with the centre position making the bending roll of respective curved hydraulic means (9) occupy adjacent two fixtures, described bending roll range sensor is optical pickocff, hall effect sensor or magnetic field sensor,
The right side of described dipper crowding gear (10) is provided with front support rod telescoping mechanism (12) and back support rod telescoping mechanism (11), front support rod telescoping mechanism (12) and back support rod telescoping mechanism (11) are arranged symmetrically about the longitudinal axis of described guide rod (15), front support rod telescoping mechanism (12) has front stretching support bar (120), front stretching support bar (120) can be used in extending in described boiler tube through the left side leaving dipper crowding gear (10) from the right side of dipper crowding gear (10), thus play the effect supporting boiler tube and prevent boiler tube generation undesirably bending, and can move back and forth in the lateral direction under the driving of front support rod telescoping mechanism (12), back support rod telescoping mechanism (11) has rear retractility support bar (110), rear retractility support bar (110) can be used in extending in described boiler tube through the left side leaving dipper crowding gear (10) from the right side of dipper crowding gear (10), thus play the effect supporting boiler tube and prevent boiler tube generation undesirably bending, and can move back and forth in the lateral direction under the driving of back support rod telescoping mechanism (11),
Described U-shaped furnace tubing bending machining technique comprises the steps:
A., U-shaped boiler tube (19) is provided;
B. two arms of described U-shaped boiler tube penetrated respectively the described passage on described left frame (13) and advance to the right, until the part that described U-shaped boiler tube will be processed stretches out in described left frame (13);
C. described second fixture (5) and the 4th fixture (8) are respectively by two arm clampings of described U-shaped boiler tube;
D. dipper crowding gear (10) motion, with the end making the first fixture (1) and the second fixture (5) clamp two arms of U-shaped boiler tube respectively;
E. the 5th fixture (7) and the 6th fixture (6) clamp the postbrachium of U-shaped boiler tube between the 4th fixture (8) and the second fixture (5), and make the 4th fixture (8), the 5th fixture (7), the 6th fixture (6) and the second fixture (5) the described postbrachium of U-shaped boiler tube is separated into three equal length sections of length; 7th fixture (3) and the 8th fixture (2) clamp the forearm of U-shaped boiler tube between the second fixture (5) and the first fixture (1), and make the second fixture (5), the 7th fixture (3), the 8th fixture (2) and the first fixture (1) the described forearm of U-shaped boiler tube is separated into three equal length sections of length;
F. the mid point of corresponding each length section in described three length sections that each in described three bending hydraulic means (9) makes its front and rear curved roller (91,90) contact on described forearm and postbrachium respectively;
G. rear retractility support bar (110) and front stretching support bar (120) are stretched in the described postbrachium of U-shaped boiler tube and the pipe of forearm by the back support rod telescoping mechanism (11) of dipper crowding gear (10) and front support rod telescoping mechanism (12) accordingly respectively, and first length section from left to right stayed in described three length sections of each arm is not supported, from left to right second and the 3rd length section supported;
H. each bending roll of the bending hydraulic means (9) in left side synchronously starts outwards described first length section of top pressure, thus make it that U-bend song occur, dipper crowding gear (10) synchronously follows pushing along with bending carrying out, meanwhile, the 5th fixture (7), the 6th fixture (6), the 7th fixture (3), the 8th fixture (2) also synchronously accompany movement; In the process of top pressure, the bending hydraulic means (9) in left side to left movement, thus makes its bending roll keep corresponding to the position of described first length section mid point under the driving of its hoofing part mechanism; To the right extension limited block (83) of the 4th fixture (8) to contact with the left extension limited block of the 5th fixture (7) and the right extension limited block (43) of the 3rd fixture (4) contacts with the left extension limited block of the 7th fixture (3) time, each bending roll of the bending hydraulic means (9) in described left side stops top pressure, and dipper crowding gear (10) stops continuing urged forward;
I. rear retractility support bar (110) and front stretching support bar (120) bounce back by the back support rod telescoping mechanism (11) of dipper crowding gear (10) and front support rod telescoping mechanism (12) accordingly respectively, thus first length section from left to right making to stay in described three length sections of each arm and from left to right second length section are not all supported, the 3rd length section is supported from left to right;
J. the bending hydraulic means (9) in the middle of starts second length section from left to right described in the pressure of top, until the right extension limited block of the 5th fixture (7) contacts with the left extension limited block of the 6th fixture (6) and the right extension limited block of the 7th fixture (3) contacts with the left extension limited block of the 8th fixture (2);
K. dipper crowding gear (10) makes described support bar (110,120) bounce back completely, is not supported to make the 3rd length section from left to right;
L. the bending hydraulic means (9) on right side starts the 3rd length section from left to right described in the pressure of top, until the right extension limited block of the 6th fixture (6) contacts with the left extension limited block of the second fixture (5) and the right extension limited block of the 8th fixture (2) contacts with the left extension limited block of the first fixture (1);
M. each fixture unclamps, and takes the heating furnace tube that bending machining is complete away;
N. heating furnace tube complete for bending machining is put into destressing heat-treatment furnace and carry out stress relief annealing, the process conditions of annealing are: holding temperature 300 degrees Celsius, temperature retention time 3 hours.
CN201410131657.1A 2014-04-03 2014-04-03 With bending roll range sensor and destressing heat treated U-shaped crooking of the tubes technique Expired - Fee Related CN103861909B (en)

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US4945751A (en) * 1988-05-27 1990-08-07 Ralph Ireland Re-rod cutter and bender
CN101695203B (en) * 2009-09-30 2012-03-07 张明放 Automatic composition manufacture method of electric heating tube
JP5707146B2 (en) * 2011-01-22 2015-04-22 三桜工業株式会社 Pipe bending machine
CN102825118A (en) * 2011-06-19 2012-12-19 江苏亚光金属制品有限公司 Machine for bending pipe for evaporator into 9 shape
CN102641924B (en) * 2012-05-10 2014-04-09 西安向阳航天材料股份有限公司 Manufacturing device and method for bimetal composite hot bend

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