CN112122404B - Movable type vehicle door frame molding press - Google Patents
Movable type vehicle door frame molding press Download PDFInfo
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- CN112122404B CN112122404B CN202010951739.6A CN202010951739A CN112122404B CN 112122404 B CN112122404 B CN 112122404B CN 202010951739 A CN202010951739 A CN 202010951739A CN 112122404 B CN112122404 B CN 112122404B
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- clamping plate
- clamp
- door frame
- mounting seat
- door
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D1/00—Straightening, restoring form or removing local distortions of sheet metal or specific articles made therefrom; Stretching sheet metal combined with rolling
- B21D1/14—Straightening frame structures
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- Automobile Manufacture Line, Endless Track Vehicle, Trailer (AREA)
Abstract
The invention discloses a movable type vehicle door frame molding machine which comprises an outer frame, an inner frame, a mounting seat and a double-side clamp combination, wherein the inner frame is connected with the outer frame in a sliding manner, the mounting seat is rotatably connected with the inner frame, the double-side clamp combination is fixed on the mounting seat and comprises two oppositely arranged side clamps and a middle clamp arranged between the two side clamps, and the distance between the two side clamps can be adjusted; the side clamp and the middle clamp respectively comprise a supporting plate, a fixed clamping plate and a movable clamping plate, and the fixed clamping plate, the supporting plate and the movable clamping plate form two jaws with mutually opposite opening directions. The movable type vehicle door frame molding press can be connected with power equipment, saves space and is convenient to operate, the middle clamp and the side clamps are respectively provided with two jaws with opposite opening directions, and the movable type vehicle door frame molding press can be simultaneously applied to molding and shaping of a vehicle door and a door frame, so that the working efficiency of shaping the vehicle door and the door frame is improved, the vehicle door can be normally closed, and the safety coefficient of transportation of a truck is improved.
Description
Technical Field
The invention relates to the technical field of stamping equipment and peripheral supporting facilities thereof, in particular to a movable type vehicle door frame molding press.
Background
When the railways in China transport bulk computer-loaded goods such as coal, grain, ore and the like, the transportation of general open trucks is mainly used, and special commercial vehicles are used as auxiliary vehicles. In the long-term use of the vehicle, due to the influences of factors such as mechanical collision, goods impact extrusion, corrosion and the like in the operation process of the loading and unloading vehicle, the edges of the vehicle door and the door frame can deform and damage to different degrees, so that the gap between the vehicle door and the door frame is too large to be closed normally, the freight cost is increased, and the transportation safety of goods is directly influenced.
At present, the gap is mostly sealed by adopting foamed rubber, straw mats or woven bags for the door and the door frame which are not seriously deformed, the mode not only increases the operation time of the train, but also increases the workload and the difficulty of unloading when arriving at the station.
Therefore, how to change the current situation that the normal closing of the door is affected by the large gap between the door and the door frame edge of the freight train due to deformation in the prior art becomes a problem to be solved urgently by those skilled in the art.
Disclosure of Invention
The invention aims to provide a movable type door frame molding press, which is used for solving the problems in the prior art and enabling a door of a freight train to be normally closed.
In order to achieve the purpose, the invention provides the following scheme: the invention provides a movable type vehicle door frame molding machine which comprises an outer frame, an inner frame, a mounting seat and a double-side clamp combination, wherein the outer frame can be connected with power equipment, the inner frame is connected with the outer frame in a sliding manner, the mounting seat is rotatably connected with the inner frame, the double-side clamp combination is fixed on the mounting seat and comprises two oppositely arranged side clamps and a middle clamp arranged between the two side clamps, the middle clamp is vertical to the side clamps, the double-side clamp combination is U-shaped, and the distance between the two side clamps can be adjusted; the side clamp with well clamp all includes backup pad, solid fixed splint and movable clamp plate, the backup pad with the mount pad links to each other, gu fixed splint with the backup pad links to each other, movable clamp plate slidable set up in the backup pad, gu fixed splint with movable clamp plate parallel arrangement, gu fixed splint the backup pad with movable clamp plate forms two keep silent that the opening direction is carried on the back mutually.
Preferably, the supporting plate is connected with the middle part of the fixed clamping plate, the area of the connecting surface of the supporting plate and the fixed clamping plate is smaller than that of the connecting surface of the fixed clamping plate and the supporting plate, the movable clamping plate is slidably sleeved outside the supporting plate, and the cross sections of the side clamp and the middle clamp are both in an I shape.
Preferably, the side clamp still includes supplementary deflector, supplementary deflector with the activity splint link to each other, supplementary deflector set up in the activity splint is close to another one side of side clamp.
Preferably, one side of the auxiliary guide plate facing the fixed clamping plate is an inclined plane, and the thickness of the auxiliary guide plate gradually decreases from the movable clamping plate to a direction away from the movable clamping plate.
Preferably, the mounting base comprises a telescopic pipe, the telescopic pipe comprises a fixed pipe and two moving pipes, the two moving pipes are slidably arranged at two ends of the fixed pipe, and the side clamp is connected with the moving pipes; the telescopic pipe is parallel to the middle clamp; the telescopic pipe is a square pipe.
Preferably, the portable door frame profiling machine still include the lift jib, the lift jib has the lifting hook, the lift jib can stretch out and draw back, the lift jib utilizes the lifting hook can hoist and mount the door.
Preferably, a slide rail is provided in the outer frame, and the inner frame has a slide post slidably provided in the slide rail.
Preferably, set up the slide gasket in the slip track, the slip post sets up the slip copper sheathing.
Preferably, a first driver is arranged on the supporting plate, the first driver is connected with the movable clamping plate, and the first driver can drive the movable clamping plate to reciprocate; the mounting seat is connected with a second driver, and the second driver can drive the mounting seat to rotate; the inner frame is connected with a third driver which can drive the inner frame to reciprocate; the relative sliding direction of the inner frame and the outer frame is vertical to the rotation axis of the mounting seat.
Preferably, the fixing sleeve is arranged at the bottom of the outer frame.
Compared with the prior art, the invention has the following technical effects: the invention relates to a movable type vehicle door frame molding machine which comprises an outer frame, an inner frame, a mounting seat and a double-side clamp combination, wherein the outer frame can be connected with power equipment, the inner frame is slidably connected with the outer frame, the mounting seat is rotatably connected with the inner frame, the double-side clamp combination is fixed on the mounting seat and comprises two oppositely arranged side clamps and a middle clamp arranged between the two side clamps, the middle clamp is vertical to the side clamps, the double-side clamp combination is U-shaped, and the distance between the two side clamps can be adjusted; side clamp and well clamp all include backup pad, solid fixed splint and activity splint, and the backup pad links to each other with the mount pad, and solid fixed splint link to each other with the backup pad, and activity splint slidable sets up in the backup pad, and gu fixed splint and activity splint parallel arrangement, gu fixed splint, backup pad and activity splint form two opening directions keeping in the same place as each other keep silent. When the movable type vehicle door frame molding press is used, the outer frame can be connected with power equipment, the power equipment can drive the integrated molding press to move to a vehicle door of a truck through the outer frame, the inner frame and the outer frame slide relatively, the inner frame drives the double-sided clamp combination on the mounting seat to extend out and move to the vehicle door frame, the double-sided clamp combination comprises a middle clamp and a side clamp, the middle clamp and the side clamp are respectively provided with two jaws with opposite opening directions, the distance between the two side clamps is adjusted, the jaws of the two side clamps far away from the middle clamp are aligned to the side edge of the vehicle door frame, the middle clamp and the side clamps are respectively provided with a fixed clamping plate and a movable clamping plate, the fixed clamping plate and the movable clamping plate are matched to complete compression molding, after the door frame molding is finished, the power equipment drives the integrated molding press to separate from the door frame, the mounting seat drives the double-sided clamp combination to rotate, the movable type vehicle door frame molding press is characterized in that the jaws of the middle clamp are aligned to the bottom edge of a vehicle door, the distance between the two side clamps is adjusted, the jaws opposite to the two side clamps are aligned to the two side edges of the vehicle door, after the positions are adjusted, the fixed clamp plate and the movable clamp plate are matched to complete molding shaping, and the shaping effect is similar to mold shaping.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
FIG. 1 is a schematic structural view of a mobile door frame molding press of the present invention;
FIG. 2 is a schematic structural view of a double-sided clamp assembly of the mobile door frame molding press of the present invention;
FIG. 3 is a schematic view of the side clamp of the mobile door frame molding press of the present invention;
FIG. 4 is a schematic view of the dual-clamp molding press of the present invention in another configuration;
the device comprises a base, a pair of side clamps, a pair of middle clamps, a pair of movable clamps, a pair of jaws, a pair of auxiliary guide plates, a pair of outer clamps, a pair of inner clamps, a pair of side clamps, a pair of middle clamps, a pair of support plates, a pair of fixed clamps, a pair of movable clamps, a pair of jaws, a pair of auxiliary guide plates, a pair of telescopic pipes, a pair of fixed pipes, a pair of movable pipes, a pair of sliding rails, a pair of sliding columns and a pair of fixed sleeves, wherein the outer frame is 1, the inner frame is 2, the mounting seat is 3, the double-sided clamp combination is 4, the side clamps are 5, the middle clamps are 6, the support plates are 7, the fixed clamps are 8, the movable clamps are 10, the jaws are 11, the auxiliary guide plates are 12, the fixed pipes are 13, the movable pipes are 14, the movable pipes, the sliding rails are 15, the sliding columns are 17, the fixed columns are arranged on the base.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention aims to provide a movable type door frame molding press, which solves the problems in the prior art and enables a freight train door to be normally closed.
In order to make the aforementioned objects, features and advantages of the present invention more comprehensible, the present invention is described in detail with reference to the accompanying drawings and the detailed description thereof.
Referring to fig. 1-4, fig. 1 is a schematic structural diagram of a movable door frame molding press of the present invention, fig. 2 is a schematic structural diagram of a double-sided clamp assembly of the movable door frame molding press of the present invention, fig. 3 is a schematic structural diagram of a side clamp of the movable door frame molding press of the present invention, and fig. 4 is a schematic structural diagram of the double-sided clamp assembly of the movable door frame molding press of the present invention in another state.
The invention provides a movable type vehicle door frame molding machine, which comprises an outer frame 1, an inner frame 2, a mounting seat 3 and a double-side clamp combination 4, wherein the outer frame 1 can be connected with power equipment, the inner frame 2 can be connected with the outer frame 1 in a sliding manner, the mounting seat 3 can be connected with the inner frame 2 in a rotating manner, the double-side clamp combination 4 is fixed on the mounting seat 3, the double-side clamp combination 4 comprises two oppositely-arranged side clamps 5 and a middle clamp 6 arranged between the two side clamps 5, the middle clamp 6 is vertical to the side clamps 5, the double-side clamp combination 4 is U-shaped, and the distance between the two side clamps 5 can be adjusted; side clamp 5 and middle clamp 6 all include backup pad 7, solid fixed splint 8 and activity splint 9, and backup pad 7 links to each other with mount pad 3, and gu fixed splint 8 links to each other with backup pad 7, and activity splint 9 slidable sets up in backup pad 7, gu fixed splint 8 and activity splint 9 parallel arrangement, gu fixed splint 8, backup pad 7 and activity splint 9 form two opening directions 10 of keeping silent that the looks mutually the back.
When the movable type vehicle door frame molding press is used, the outer frame 1 can be connected with power equipment, the power equipment can drive the integrated molding press to move to a vehicle door of a truck through the outer frame 1, the inner frame 2 and the outer frame 1 slide relatively, the inner frame 2 drives the double-sided clamp combination 4 on the mounting seat 3 to extend out and move to a vehicle door frame, the double-sided clamp combination 4 comprises a middle clamp 6 and side clamps 5, the middle clamp 6 and the side clamps 5 are respectively provided with two clamp jaws 10 with opposite opening directions, the distance between the two side clamps 5 is adjusted, the clamp jaws 10 of the two side clamps 5 far away from the middle clamp 6 are aligned to the side edge of the vehicle door frame, the middle clamp 6 and the side clamps 5 are respectively provided with a fixed clamping plate 8 and a movable clamping plate 9, the fixed clamping plate 8 and the movable clamping plate 9 are matched to finish molding and shaping, and after the shaping of the vehicle door frame is finished, the power equipment drives the integrated molding press to leave the vehicle door frame, the mounting seat 3 drives the double-sided clamp combination 4 to rotate, the jaw 10 of the middle clamp 6 is aligned to the bottom edge of the vehicle door, the distance between the two side clamps 5 is adjusted, the jaw 10 opposite to the two side clamps 5 is aligned to the two side edges of the vehicle door, after the position is adjusted, the fixed clamp plate 8 and the movable clamp plate 9 are matched to complete profiling shaping, the two side clamps 5 and the middle clamp 6 can form a relative plane, and the shaping effect is similar to that of mold shaping. The movable type vehicle door frame molding press can be connected with power equipment, saves space and is convenient to operate, the middle clamp 6 and the side clamps 5 are respectively provided with two jaws 10 with opposite opening directions, and the movable type vehicle door frame molding press can be simultaneously applied to profiling and shaping of vehicle doors and door frame edges, so that the working efficiency of shaping the vehicle doors and the door frames is improved, the vehicle doors of trucks can be normally closed, and the safety coefficient of truck transportation is improved. It should be noted that the door of the conventional truck is hinged with the top of the door frame, and the hinged part does not need to be shaped, so that the double-sided clamp combination 4 is U-shaped, shapes the bottom edge and two side edges of the door, and shapes the two side edges of the door frame. It should be emphasized here that the mount pad 3 drives the double-sided clamp combination 4 to rotate, and the double-sided clamp combination 4 can rotate to lie flat on the outer frame 1 and the inner frame 2 (see fig. 4 for details), can directly hold up the door panel of the vehicle door to carry out the trilateral plastic, and is convenient to observe the plastic effect.
The middle parts of the supporting plate 7 and the fixed clamping plate 8 are connected, the area of the connecting surface of the supporting plate 7 and the fixed clamping plate 8 is smaller than that of the connecting surface of the fixed clamping plate 8 and the supporting plate 7, the area of the cross section of the supporting plate 7 is smaller, the influence on the normal work of the jaws 10 at two sides is avoided, the movable clamping plate 9 is slidably sleeved outside the supporting plate 7, and the cross sections of the side clamp 5 and the middle clamp 6 are in an I shape.
Specifically, in order to better carry out the plastic to the freight train door, side clamp 5 still includes supplementary deflector 11, and supplementary deflector 11 links to each other with movable clamp plate 9, and supplementary deflector 11 sets up in movable clamp plate 9 and is close to one side of opposite side clamp 5, and when two side clamps 5 carried out the die mould plastic to door both sides limit, supplementary deflector 11 can the fixed door of auxiliary stay, avoids the door to warp, improves door plastic quality.
Because the vehicle door may have a certain deformation, in order to ensure that the auxiliary supporting plate 7 can smoothly support the vehicle door in the shaping process, one side of the auxiliary guiding plate 11 facing the fixed clamping plate 8 is an inclined surface, and the thickness of the auxiliary guiding plate 11 is gradually reduced from the movable clamping plate 9 to the direction away from the movable clamping plate 9.
More specifically, the mounting base 3 comprises a telescopic pipe 12, the telescopic pipe 12 comprises a fixed pipe 13 and two moving pipes 14, the two moving pipes 14 are slidably arranged at two ends of the fixed pipe 13, and the side clamps 5 are connected with the moving pipes 14; the telescopic pipe 12 is parallel to the middle clamp 6, the side clamps 5 correspond to the moving pipes 14 one by one, and the moving pipes 14 slide relative to the fixed pipe 13 to drive the side clamps 5 to move, so that the distance between the two side clamps 5 is adjusted. In this embodiment, the fixed pipe 13 is connected to the two moving pipes 14 by a double head cylinder capable of driving the two moving pipes 14 to slide.
In addition, in order to prevent the moving pipe 14 and the fixed pipe 13 from rotating relatively, the telescopic pipe 12 is a square pipe, so that the moving pipe 14 can be prevented from rotating in the pressing process, and the stability and reliability of the side clamp 5 can be improved.
The movable type vehicle door frame molding machine further comprises a lifting hanger rod, the lifting hanger rod is provided with a lifting hook, the lifting hanger rod can stretch and retract, the lifting hanger rod can be used for lifting the vehicle door by utilizing the lifting hook, the lifting hanger rod can be arranged on power equipment and is convenient for an operator to control, and the lifting hanger rod is lifted and used for lifting the vehicle door, so that the shaping work can be smoothly carried out.
Furthermore, a sliding rail 15 is arranged in the outer frame 1, the inner frame 2 is provided with a sliding column 16, the sliding column 16 is slidably arranged in the sliding rail 15, the inner frame 2 and the outer frame 1 slide relatively to drive the double-side clamp combination 4 to adjust the position, meanwhile, the mounting seat 3 is hinged with one end of the inner frame 2 by means of auxiliary adjustment of power equipment, and in order to avoid the inner frame 2 slipping from the outer frame 1, the sliding rail 15 is provided with a limit position to limit the relative limit position of the inner frame 2 and the outer frame 1.
In order to prolong the service life of the sliding rail 15 and the sliding column 16, a slide gasket is arranged in the sliding rail 15, and a sliding copper sleeve is arranged on the sliding column 16.
Furthermore, a first driver is arranged on the supporting plate 7, the first driver is connected with the movable clamping plate 9, and the first driver can drive the movable clamping plate 9 to reciprocate; the mounting base 3 is connected with a second driver, and the second driver can drive the mounting base 3 to rotate; the inner frame 2 is connected with a third driver, and the third driver can drive the inner frame 2 to reciprocate; the relative sliding direction of the inner frame 2 and the outer frame 1 is perpendicular to the rotation axis of the mounting seat 3. The first driver, the second driver and the third driver can be hydraulic cylinders, the movable door frame molding press of the invention is provided with a control unit to control the movement of each part, and the control unit belongs to the conventional means of the technicians in the field and is not described again.
In the embodiment, the power equipment is a forklift, the forklift can drive the integrated molding press to lift, and the fixing sleeve 17 is arranged at the bottom of the outer frame 1, so that the forklift can carry conveniently.
According to the movable type vehicle door frame molding press, the side clamps 5 and the middle clamp 6 are respectively provided with two jaws 10 with opposite opening directions, during work, the distance between the two side clamps 5 is adjusted, so that the outer side jaws 10 of the two side clamps 5 are aligned to the side edge of a door frame, the middle clamp 6 and the side clamps 5 are respectively provided with the fixed clamping plate 8 and the movable clamping plate 9, the fixed clamping plate 8 and the movable clamping plate 9 are matched to finish molding shaping, after the door frame is shaped, the jaws 10 of the middle clamp 6 are aligned to the bottom edge of a vehicle door, the distance between the two side clamps 5 is adjusted, so that the inner side jaws 10 opposite to the two side clamps 5 are aligned to the two side edges of the vehicle door, and after the positions are adjusted, the fixed clamping plate 8 and the movable clamping plate 9 are matched to finish molding shaping, the movable type vehicle door frame molding press can be simultaneously applied to molding shaping the edges of the vehicle door and the door frame, so that the molding working efficiency of the vehicle door and the door frame is improved, make the freight train door normally close, improved freight train transportation factor of safety.
The principle and the implementation mode of the invention are explained by applying a specific example, and the description of the embodiment is only used for helping to understand the method and the core idea of the invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the above, the present disclosure should not be construed as limiting the invention.
Claims (8)
1. The utility model provides a portable door and door frame molding press which characterized in that: the double-side clamping device comprises an outer frame, an inner frame, a mounting seat and a double-side clamping clamp combination, wherein the outer frame can be connected with power equipment, the inner frame can be slidably connected with the outer frame, the mounting seat can be rotatably connected with the inner frame, the double-side clamping clamp combination is fixed on the mounting seat and comprises two oppositely arranged side clamps and a middle clamp arranged between the two side clamps, the middle clamp is perpendicular to the side clamps, the double-side clamping clamp combination is U-shaped, and the distance between the two side clamps can be adjusted; the side clamp and the middle clamp respectively comprise a supporting plate, a fixed clamping plate and a movable clamping plate, the supporting plate is connected with the mounting seat, the fixed clamping plate is connected with the supporting plate, the movable clamping plate is slidably arranged on the supporting plate, the fixed clamping plate and the movable clamping plate are arranged in parallel, and the fixed clamping plate, the supporting plate and the movable clamping plate form two jaws with opposite opening directions; a first driver is arranged on the supporting plate and connected with the movable clamping plate, and the first driver can drive the movable clamping plate to reciprocate; the mounting seat is connected with a second driver, and the second driver can drive the mounting seat to rotate; the inner frame is connected with a third driver which can drive the inner frame to reciprocate; the relative sliding direction of the inner frame and the outer frame is vertical to the rotation axis of the mounting seat.
2. The mobile door and door frame molding press of claim 1, wherein: the side clamp further comprises an auxiliary guide plate, the auxiliary guide plate is connected with the movable clamping plate, and the auxiliary guide plate is arranged on one side, close to the other side clamp, of the movable clamping plate.
3. The mobile door and door frame molding press of claim 2, wherein: one side of the auxiliary guide plate, which faces the fixed clamping plate, is an inclined plane, and the thickness of the auxiliary guide plate is gradually reduced from the movable clamping plate to the direction far away from the movable clamping plate.
4. The mobile door and door frame molding press of claim 1, wherein: the mounting seat comprises a telescopic pipe, the telescopic pipe comprises a fixed pipe and two moving pipes, the two moving pipes are slidably arranged at two ends of the fixed pipe, and the side clamp is connected with the moving pipes; the telescopic pipe is parallel to the middle clamp; the telescopic pipe is a square pipe.
5. The mobile door and door frame molding press of claim 1, wherein: still include the lift jib, the lift jib has the lifting hook, the lift jib can stretch out and draw back, the lift jib utilizes the lifting hook can hoist and mount the door.
6. The mobile door and door frame molding press of claim 1, wherein: a sliding track is arranged in the outer frame, the inner frame is provided with a sliding column, and the sliding column is slidably arranged in the sliding track.
7. The mobile door and door frame molding press of claim 6, wherein: slide gaskets are arranged in the sliding tracks, and sliding copper sleeves are arranged on the sliding columns.
8. The mobile door and door frame molding press of claim 1, wherein: the bottom of the outer frame is provided with a fixed sleeve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010951739.6A CN112122404B (en) | 2020-09-11 | 2020-09-11 | Movable type vehicle door frame molding press |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010951739.6A CN112122404B (en) | 2020-09-11 | 2020-09-11 | Movable type vehicle door frame molding press |
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| Publication Number | Publication Date |
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| CN112122404A CN112122404A (en) | 2020-12-25 |
| CN112122404B true CN112122404B (en) | 2022-07-29 |
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| CN202010951739.6A Active CN112122404B (en) | 2020-09-11 | 2020-09-11 | Movable type vehicle door frame molding press |
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| CN208527755U (en) * | 2018-07-25 | 2019-02-22 | 南昌江铃集团车架有限责任公司 | A kind of automobile frame clamping fixture for correcting |
| CN108941257A (en) * | 2018-08-16 | 2018-12-07 | 郑州铁总智能科技有限公司 | Railway freight-car doorframe and side door one trimmer |
| CN109821931A (en) * | 2019-03-11 | 2019-05-31 | 郑州铁总智能科技有限公司 | Railway freight-car doorframe and side door integral type trimmer based on excavator technology platform |
| CN110560513A (en) * | 2019-10-09 | 2019-12-13 | 秦皇岛金石科贸有限公司 | movable lower side door frame shaping device and method |
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| Publication number | Publication date |
|---|---|
| CN112122404A (en) | 2020-12-25 |
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Inventor after: Zhang Guangming Inventor before: Cao Zhenquan |