CN209969276U - Double-curvature section bending machine - Google Patents

Double-curvature section bending machine Download PDF

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Publication number
CN209969276U
CN209969276U CN201920510116.8U CN201920510116U CN209969276U CN 209969276 U CN209969276 U CN 209969276U CN 201920510116 U CN201920510116 U CN 201920510116U CN 209969276 U CN209969276 U CN 209969276U
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China
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plate
wheel
driven
pressing wheel
power
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CN201920510116.8U
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Chinese (zh)
Inventor
赵国华
吕英杰
李建朋
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Hebei Huahuan Chemical Equipment Manufacturing Co Ltd
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Hebei Huahuan Chemical Equipment Manufacturing Co Ltd
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Abstract

The utility model relates to a technical field of section bar processing equipment, concretely relates to double curvature section bar bending machine, including the frame, set up the feeding subassembly that is used for supporting and carrying the section bar in the frame, shaping subassembly and extrapolation subassembly and be used for providing the power device of power for feeding subassembly, feeding subassembly includes two driven shafts, coaxial fixedly connected with driven die wheel behind the one end of driven shaft wearing out the frame, power device drive driven shaft is rotatory, shaping subassembly includes liftable set up in the frame upper pinch roller and lie in under the upper pinch roller and the lower pinch roller of height-adjustable, two driven die wheels symmetric distribution are in the both sides of upper pinch roller and lower pinch roller; the section bar penetrates through one driven die wheel, penetrates through the space between the upper pressing wheel and the lower pressing wheel and then penetrates out of the other driven die wheel; the pushing-out assembly is positioned above the driven die wheel, can move relative to the rack and can push the profile to one side far away from the rack; the utility model discloses a tractor serves several purposes has reduced manufacturing cost relatively.

Description

Double-curvature section bending machine
Technical Field
The utility model relates to a technical field of section bar processing equipment, concretely relates to double curvature section bar bending machine.
Background
In the industries of metallurgy, chemical engineering, petroleum, electric power, pharmacy and the like, bent metal sections, special-shaped materials, plates, spiral coils, spiral half pipes and other parts with specific shapes are often used for heating, cooling and guiding in the production process. The existing pipe bending equipment has the advantages of single function, complex structure and poor adaptability, can only realize simple bending of pipes in a specific plane, can not realize processing of three-dimensional pipes in a three-dimensional space and can not realize processing of pipes with different curvatures, different production equipment needs to be repeatedly purchased for products with different shapes, and the manufacturing cost is high.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a not enough to prior art exists, the utility model aims to provide a double curvature section bar bending machine realizes a tractor serves several purposes, has reduced manufacturing cost relatively.
The purpose of the utility model is realized through the following technical scheme:
a double-curvature section bending machine comprises a rack, a feeding assembly, a forming assembly, an outward pushing assembly and a power device, wherein the feeding assembly, the forming assembly and the outward pushing assembly are arranged on the rack and used for supporting and conveying sections, the power device is used for providing power for the feeding assembly, the feeding assembly comprises two driven shafts, one ends of the driven shafts penetrate through the rack and then are coaxially and fixedly connected with driven mold wheels, the power device drives the driven shafts to rotate, the forming assembly comprises an upper pressing wheel and a lower pressing wheel, the upper pressing wheel and the lower pressing wheel are arranged on the rack in a lifting mode, the height of the lower pressing wheel is adjustable, and the two driven mold wheels are symmetrically; the section bar penetrates through one driven die wheel, penetrates through the space between the upper pressing wheel and the lower pressing wheel and then penetrates out of the other driven die wheel; the pushing-out assembly is positioned above the driven die wheel and can move relative to the rack, and can push the section bar to one side far away from the rack.
By adopting the technical scheme, when the section is processed, the power device provides power for the driven shaft, so that the driven die wheels rotate all the time, the section is sent into the bending machine from the driven die wheel on one side, the driven die wheels drive the section to enter a gap between the upper pressing wheel and the lower pressing wheel, and the adjustment of the center distance between the upper pressing wheel and the lower pressing wheel and the two driven die wheels is realized by adjusting the positions of the upper pressing wheel and the lower pressing wheel, so that a circumferential pipe or a double-curvature bent pipe can be extruded according to actual requirements, and multiple functions of one machine are realized; the profile is bent in a plane and then extends to a space by continuously pushing the outward pushing assembly in the process of bending the profile, so that a product with a three-dimensional space structure is formed, and the defect of poor universality of the traditional metal profile bending equipment is overcome; the outer pushing assembly can move relative to the rack, so that the distance between the outer pushing assembly and the rack can be adjusted, products with different screw pitches can be ejected out, one machine can meet the requirements of processing of various shapes of profiles, and the processing and production cost is relatively reduced.
Preferably, the rack comprises a bottom plate, two convex side plates fixedly connected to two sides above the bottom plate, a rib plate connecting the two side plates, and an end plate coated between the two side plates, wherein the two side plates are parallel to each other and are perpendicular to the bottom plate.
By adopting the technical scheme, the box-type welding structure is adopted, the bottom of the end plate and the two side plates and the bottom plate are enclosed to form a box structure, the frame is ensured to meet the requirements of strength and rigidity, and the bending of a large-caliber steel pipe (less than or equal to phi 219) can be met.
Preferably, a main slideway vertical to the bottom plate is arranged on the side plate, and the upper pressing wheel and the lower pressing wheel are arranged in the main slideway in a sliding mode.
Through adopting above-mentioned technical scheme, go up pinch roller and lower pinch roller sliding setting realize both altitude mixture control in main slide to can satisfy the requirement of different camber section bar products.
Preferably, two auxiliary slideways are symmetrically arranged on the side plate on two sides of the main slideway, the auxiliary slideways are arranged in parallel to the main slideway, auxiliary pressing wheels are arranged in the auxiliary slideways in a sliding mode, and gaps for clamping the section bars are reserved between the auxiliary pressing wheels and the driven die wheels.
Preferably, the height from the bottom end of the auxiliary slide way to the bottom plate is greater than the height from the bottom end of the main slide way to the bottom plate.
Through adopting above-mentioned technical scheme, through assisting pinch roller and driven die wheel centre gripping section bar, realize the transport of section bar on the one hand, on the other hand can realize the control to section bar bending angle through the height of adjusting the auxiliary pinch roller. In addition, through adjusting the position of auxiliary pressure wheel, can satisfy in the section bar processing of specifications such as different diameters or thickness, the practicality is strong.
Preferably, the two groups of the outward pushing assemblies are respectively positioned at two sides above the upper pinch roller.
Preferably, the pushing-out assembly comprises a screw and a rotating wheel rotatably connected to one end of the screw, the screw is perpendicular to the side plate and is detachably arranged on the side plate, and the axis of the rotating wheel is parallel to the side plate.
Through adopting above-mentioned technical scheme, through rotatory screw rod, make it take the runner to the direction removal of being close to or keeping away from the curb plate, when the section bar of below upwards reachs the runner of one side from the driven mould wheel, the pitch of section bar can be adjusted to the distance of control runner apart from the curb plate, and two runner cooperations not only can realize the control of pitch, can guarantee the stability of section bar in three-dimensional space shaping moreover.
Preferably, power device includes driving shaft and drive driving shaft pivoted power component, the both ends of driving shaft rotate respectively and connect on two curb plates, the coaxial fixedly connected with master gear behind the curb plate is worn out to the one end of keeping away from the shaping subassembly of driving shaft, and two driven shaft symmetries set up in the both sides of driving shaft, the coaxial fixedly connected with driven gear of one end of keeping away from the shaping subassembly of driven shaft, the master gear can drive driven gear rotates.
Through adopting above-mentioned technical scheme, power component drive driving shaft is rotatory, and the driving shaft drives the master gear rotatory, and the master gear drives driven gear rotatory, and driven gear drives the driven shaft and rotates together, and the driven shaft drives driven die wheel and rotates, realizes the support and the transport to the section bar.
Preferably, two idle wheel shafts are symmetrically arranged on the two sides of the side plates above the driving shaft, two ends of each idle wheel shaft are rotatably connected to the two side plates, one end, far away from the forming assembly, of each idle wheel shaft penetrates through the side plates and then is coaxially and fixedly connected with an idle gear, and the idle gear is meshed with the main gear and the driven gear.
Through adopting above-mentioned technical scheme, the master gear meshing is situated between the gear to drive and situated between the gear rotation, and the gear meshing driven gear that is situated between, thereby drive driven gear rotation, through meshing transmission between three groups of gears, further improve the stability of rotation process, thereby improve the crooked quality of section bar.
Preferably, the power assembly comprises a motor and a speed reduction motor, the power output end of the motor is connected with the power input end of the speed reduction motor, and the power output end of the speed reduction motor is fixedly connected with the driving shaft.
Through adopting above-mentioned technical scheme, replace traditional hydraulic system control with mechanical transmission control, improve drive stability to improve section bar processingquality.
To sum up, the utility model discloses following beneficial effect has:
(1) the upper pressing wheel and the lower pressing wheel are matched with the feeding assembly and the outward pushing assembly, so that the bending and processing of profiles with different curvatures and different screw pitches can be realized, the multiple functions of one machine are realized, and the processing and production cost is relatively reduced;
(2) the auxiliary pressing wheel is matched with the driven die wheel, so that feeding can be realized, bending of a large-diameter steel pipe can be realized, and the practicability is high;
(3) the frame of box structure satisfies intensity, rigidity requirement, can satisfy the system of bending of heavy-calibre steel pipe (less than or equal to phi 219), and the practicality is strong.
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 from the side of the molding assembly;
FIG. 3 is a schematic structural view of the present invention in a processing state;
fig. 4 is a schematic structural view of the inside of the rack of the present invention;
fig. 5 is a schematic structural view of the assembly for controlling the lifting of the lower pressing wheel according to the present invention.
Reference numerals: 1. a frame; 11. a base plate; 12. a side plate; 13. a rib plate; 14. an end plate; 15. a transverse plate; 21. a drive shaft; 211. a main gear; 31. a motor; 32. a reduction motor; 41. an upper pinch roller; 42. a lower pinch roller; 421. a first motor; 422. a first gear; 423. a second lead screw; 424. a second gear; 425. a support block; 43. a first lead screw; 44. a first slider; 45. a first rotating shaft; 46. a second slider; 47. a second rotating shaft; 51. a main slideway; 61. a driven shaft; 611. a driven gear; 62. a driven die wheel; 71. a medium wheel shaft; 711. a idler gear; 81. a screw; 82. a rotating wheel; 91. an auxiliary slideway; 92. an auxiliary pressure wheel; 93. an auxiliary wheel shaft; 94. a limit gear; 95. a chain; 10. and (3) a section bar.
Detailed Description
The present invention will be further described with reference to the accompanying drawings.
The utility model discloses a double curvature section bar bending machine, as shown in figure 1 and figure 2, including frame 1, set up pay-off subassembly, shaping subassembly and the extrapolation subassembly that are used for supporting and carry section bar 10 in frame 1 and be used for providing the power device of power for the pay-off subassembly. The power device comprises a driving shaft 21 and a power assembly for driving the driving shaft 21 to rotate, the power assembly comprises a motor 31 and a speed reducing motor 32, a power output end of the motor 31 is connected with a power input end of the speed reducing motor 32, and a power output end of the speed reducing motor 32 is fixedly connected with the driving shaft 21, so that the driving shaft 21 can be driven to rotate. The frame 1 comprises a bottom plate 11, two convex side plates 12 welded on two sides above the bottom plate 11, rib plates 13 welded between the two side plates 12 and end plates 14 coated and welded between the two side plates 12, the two side plates 12 are parallel and perpendicular to the bottom plate 11, the end plates 14 wrap the lower parts of the convex side plates 12 and seal the upper parts of the side plates 12 and bosses formed on the lower parts, so that box-type welding structures are formed between the end plates 14, the lower parts of the two side plates 12 and the bottom plate 11, and the effect of strengthening and supporting is achieved.
As shown in fig. 1 and 2, the forming assembly includes an upper pressing wheel 41 that is arranged on the frame 1 in a lifting manner, and a lower pressing wheel 42 that is positioned under the upper pressing wheel 41 and has an adjustable height. All set up the main slide 51 that perpendicular bottom plate 11 set up on every curb plate 12, the top of two curb plates 12 all is fixed with diaphragm 15, equal threaded connection has the vertical first lead screw 43 that sets up downwards on every diaphragm 15, the bottom of every first lead screw 43 all is connected with first slider 44 through the bearing rotation, be provided with first pivot 45 between two first sliders 44, the coaxial fixed connection of last pinch roller 41 is in the one end of first pivot 45 and is located one side of keeping away from curb plate 12 of first slider 44. The first screw 43 is rotated to drive the first slider 44 to slide along the main slideway 51, so as to drive the upper pressure wheel 41 to lift, and the position of the upper pressure wheel 41 is adjusted. The second sliding blocks 46 are arranged in the main sliding way 51 below the first sliding blocks 44 in a sliding manner, a second rotating shaft 47 is connected between the two second sliding blocks 46 in a rotating manner, and the lower pressing wheel 42 is coaxially and fixedly connected to one end of the second rotating shaft 47 and is positioned on one side, far away from the side plate 12, of the second sliding block 46.
As shown in fig. 3, the feeding assembly includes two driven shafts 61, and one end of the driven shaft 61 penetrates through the side plate 12 and is coaxially and fixedly connected with a driven die wheel 62. Two auxiliary slideways 91 are symmetrically arranged on the two sides of the main slideway 51 on the side plate 12, the auxiliary slideways 91 are arranged in parallel to the main slideway 51, the height from the bottom end of each auxiliary slideway 91 to the bottom plate 11 is greater than the height from the bottom end of the main slideway 51 to the bottom plate 11, an auxiliary pressing wheel 92 is arranged in each auxiliary slideway 91 in a sliding mode, and a gap for clamping the section bar 10 is reserved between each auxiliary pressing wheel 92 and the driven die wheel 62. Two auxiliary slideways 91 are respectively arranged on the two side plates 12 to form two groups, and two auxiliary slideways 91 are arranged in front of and behind each group (one side of the forming assembly is the front end, and one side of the power device is the rear end). As shown in fig. 4, an auxiliary wheel shaft 93 is coaxially connected between the auxiliary pressing wheels 92 in each set of two auxiliary slideways 91, two sets of auxiliary wheel shafts 93 are respectively and fixedly provided with a limit gear 94, and the two limit gears 94 are connected through a chain 95, so that the stability of the auxiliary pressing wheels 92 is further improved. The sliding lifting structure and principle of the auxiliary pressing wheel 92 in the auxiliary slideway 91 are completely the same as those of the upper pressing wheel 41, and are not described in detail herein.
As shown in fig. 4 and 5, a component for driving the lower pressure wheel 42 to ascend and descend is disposed on the bottom plate 11 below the second rotating shaft 47, and specifically includes a first motor 421, two first gears 422, two second screws 423, a second gear 424 and a supporting block 425, and the supporting block 425 is sleeved on the second rotating shaft 47 and is rotatably connected with the second rotating shaft 47 through a bearing. The two second screw rods 423 are respectively located at two sides of the driving shaft 21, the upper parts of the two second screw rods 423 are respectively in threaded connection with the upper part and the lower part of the supporting block 425 respectively and coaxially and fixedly connected with the two first gears 422, and the bottom ends are rotatably connected to the bottom plate 11 through bearings. The first motor 421 drives the second gear 424 to rotate, and the second gear 424 is meshed with the two first gears 422, so as to drive the second screw rod 423 to displace in the vertical direction. The second screw 423 is arranged perpendicular to the supporting block 425 and is rotationally connected with the supporting block 425 through a bearing, so that the first motor 421 coaxially drives the second gear 424, the second gear 424 is meshed with the second motor and drives the two first gears 422 to rotate, the first gears 422 coaxially drive the second screw 423 to rotate, the supporting block 425 drives the second rotating shaft 47 to ascend and descend along the second screw 423, and the ascending and descending control of the pressing wheel 42 is realized.
As shown in fig. 1 and 4, two ends of the driving shaft 21 are respectively rotatably connected to the two side plates 12, one end of the driving shaft 21, which is far away from the forming assembly, penetrates through the side plates 12 and is coaxially and fixedly connected with a main gear 211, two driven shafts 61 are symmetrically arranged on two sides of the driving shaft 21, and one end of the driven shaft 61, which is far away from the forming assembly, is coaxially and fixedly connected with a driven gear 611. Two idle gears 71 are symmetrically arranged on two sides of the side plates 12 above the driving shaft 21, two ends of the idle gears 71 are rotatably connected to the two side plates 12, one end of the idle gear 71, which is far away from the forming assembly, penetrates through the side plates 12 and is coaxially and fixedly connected with an idle gear 711, the idle gear 711 is meshed with the main gear 211 and the driven gear 611, so that the motor 31 drives the reduction motor 32, the reduction motor 32 drives the main gear 211, the main gear 211 drives the idle gear 711, the idle gear 711 drives the driven gear 611, the driven gear 611 drives the driven shaft 61 to rotate, the driven shaft 61 drives the driven die wheel 62 to rotate, the profile 10 penetrates through one driven die wheel 62, penetrates through the space between the upper pressing wheel 41 and the lower pressing wheel 42 and then penetrates out of the other driven die wheel 62, and the feeding process is achieved continuously.
As shown in FIG. 5, the extrapolation assembly is provided in two sets, one on each side of the upper pinch roller 41. Each set of the push-out assemblies is located above the driven die wheel 62 and is movable relative to the side plate 12 and can push the profile 10 towards the side remote from the side plate 12. The concrete structure of the push-out component comprises a screw 81 and a rotating wheel 82 which is rotatably connected with one end of the screw 81, the screw 81 is vertical to the side plate 12 and is detachably arranged on the side plate 12, and the axis of the rotating wheel 82 is parallel to the side plate 12; the pitch of the bending pitch of the profile 10 is controlled by turning the screw 81 to control the distance between the wheel 82 and the side plate 12.
The utility model discloses an implement the principle specifically as follows:
according to the processing requirement, the height of the auxiliary pressing wheel 92 is adjusted, so that the bending caliber of the section bar 10 is controlled; the heights of the upper pressing wheel 41 and the lower pressing wheel 42 are adjusted, so that the curvature control of the bending of the section bar 10 can be realized; for example, lower pressure wheel 42, being higher than driven die wheel 62, will bend out a product of at least two curvatures; the pitch of the product can be controlled by adjusting the distance between the two rotating wheels 82 and the side plate 12, and the distance between the rotating wheel 82 on the output side and the side plate 12 is larger than the distance between the rotating wheel 82 on the output side and the side plate 12, so that the profile 10 after being bent in space can be supported left and right, and is more stable when continuously extending in the direction far away from the side plate 12; as shown in fig. 3, the profile 10 to be processed is fed into a bending machine from a driven die wheel 62 on one side, enters between an upper pressing wheel 41 and a lower pressing wheel 42 under the clamping and conveying of the driven die wheel 62 and an auxiliary pressing wheel 92 to be bent, then is fed to a rotating wheel 82 of an outward pushing assembly after passing through the bending of the other driven die wheel 62 and the auxiliary pressing wheel 92, and the processing process of products such as stable three-dimensional spiral and the like is realized under the conveying, pushing and supporting of the two rotating wheels 82. In addition, the types and the structures of the driven die wheel 62, the auxiliary pressing wheel 92, the upper pressing wheel 41 and the lower pressing wheel 42 are changed, so that the manufacture of double-curvature semi-circular tubes pressed by steel strips and the manufacture of circular open-loop or closed-loop products pressed by rectangular steel, round steel, channel steel, angle steel, strip steel and the like can be realized.
The present embodiment is only for explaining the present invention, and it is not limited to the present invention, and those skilled in the art can make modifications to the present embodiment without inventive contribution as required after reading the present specification, but all of them are protected by patent laws within the scope of the claims of the present invention.

Claims (10)

1. The utility model provides a double curvature section bar bending machine, includes frame (1), sets up the power device that is used for supporting and carrying feeding assembly, shaping subassembly and the extrapolation subassembly of section bar (10) and is used for providing power for feeding assembly on frame (1), its characterized in that: the feeding assembly comprises two driven shafts (61), one end of each driven shaft (61) penetrates through the rack (1) and is coaxially and fixedly connected with a driven mold wheel (62), the power device drives the driven shafts (61) to rotate, the forming assembly comprises an upper pressing wheel (41) arranged on the rack (1) in a lifting mode and a lower pressing wheel (42) which is located right below the upper pressing wheel (41) and is adjustable in height, and the two driven mold wheels (62) are symmetrically distributed on two sides of the upper pressing wheel (41) and the lower pressing wheel (42); the section bar (10) penetrates from one driven die wheel (62), penetrates between the upper pressing wheel (41) and the lower pressing wheel (42) and then penetrates out from the other driven die wheel (62); the pushing-out assembly is positioned above the driven die wheel (62), can move relative to the machine frame (1) and can push the section bar (10) to one side far away from the machine frame (1).
2. The double curvature profile bender according to claim 1, wherein: the rack (1) comprises a bottom plate (11), two convex side plates (12) fixedly connected to two sides above the bottom plate (11), a rib plate (13) for connecting the two side plates (12) and an end plate (14) coated between the two side plates (12), wherein the two side plates (12) are parallel to each other and are perpendicular to the bottom plate (11).
3. The double curvature profile bender according to claim 2, wherein: the side plate (12) is provided with a main slideway (51) which is vertical to the bottom plate (11), and the upper pressing wheel (41) and the lower pressing wheel (42) are arranged in the main slideway (51) in a sliding manner.
4. The double curvature profile bender according to claim 3, wherein: curb plate (12) are gone up and are provided with two in the bilateral symmetry of main slide (51) and assist slide (91), assist slide (91) and be on a parallel with main slide (51) and set up, it is provided with in assisting slide (91) and assists pinch roller (92), assist and leave the clearance of centre gripping section bar (10) between pinch roller (92) and driven die wheel (62).
5. The double curvature profile bender according to claim 4, wherein: the height from the bottom end of the auxiliary slideway (91) to the bottom plate (11) is greater than the height from the bottom end of the main slideway (51) to the bottom plate (11).
6. The double curvature profile bender according to claim 2, wherein: the two groups of the outward pushing assemblies are respectively positioned on two sides above the upper pressing wheel (41).
7. The double curvature profile bender according to claim 6, wherein: the pushing-out assembly comprises a screw rod (81) and a rotating wheel (82) connected to one end of the screw rod (81) in a rotating mode, the screw rod (81) is perpendicular to the side plate (12) and is detachably arranged on the side plate (12), and the axis of the rotating wheel (82) is parallel to the side plate (12).
8. The double curvature profile bender according to claim 2, wherein: the power device comprises a driving shaft (21) and a driving shaft (21) rotating power assembly, the two ends of the driving shaft (21) are respectively connected to two side plates (12) in a rotating mode, one end, away from the forming assembly, of the driving shaft (21) penetrates through a main gear (211) which is coaxially and fixedly connected to the rear of each side plate (12), two driven shafts (61) are symmetrically arranged on two sides of the driving shaft (21), a driven gear (611) which is coaxially and fixedly connected to one end, away from the forming assembly, of each driven shaft (61), and the main gear (211) can drive the driven gear (611) to rotate.
9. The double curvature profile bender according to claim 8, wherein: two idle wheel shafts (71) are symmetrically arranged on two sides of the side plate (12) above the driving shaft (21), two ends of each idle wheel shaft (71) are rotatably connected to the two side plates (12), one end, far away from the forming assembly, of each idle wheel shaft (71) penetrates through the side plate (12) and then is coaxially and fixedly connected with an idle gear (711), and the idle gear (711) is meshed with the main gear (211) and the driven gear (611).
10. The double curvature profile bender according to claim 8, wherein: the power assembly comprises a motor (31) and a speed reducing motor (32), the power output end of the motor (31) is connected with the power input end of the speed reducing motor (32), and the power output end of the speed reducing motor (32) is fixedly connected with the driving shaft (21).
CN201920510116.8U 2019-04-15 2019-04-15 Double-curvature section bending machine Active CN209969276U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201920510116.8U CN209969276U (en) 2019-04-15 2019-04-15 Double-curvature section bending machine

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201920510116.8U CN209969276U (en) 2019-04-15 2019-04-15 Double-curvature section bending machine

Publications (1)

Publication Number Publication Date
CN209969276U true CN209969276U (en) 2020-01-21

Family

ID=69257999

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Application Number Title Priority Date Filing Date
CN201920510116.8U Active CN209969276U (en) 2019-04-15 2019-04-15 Double-curvature section bending machine

Country Status (1)

Country Link
CN (1) CN209969276U (en)

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