CN202555951U - Crane girder welding machine - Google Patents
Crane girder welding machine Download PDFInfo
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- CN202555951U CN202555951U CN201220200327XU CN201220200327U CN202555951U CN 202555951 U CN202555951 U CN 202555951U CN 201220200327X U CN201220200327X U CN 201220200327XU CN 201220200327 U CN201220200327 U CN 201220200327U CN 202555951 U CN202555951 U CN 202555951U
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- crane girder
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- bonding machine
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Abstract
The utility model relates to a crane girder welding machine which comprises a fixed frame and a movable frame assembled on the fixed frame in guiding and sliding mode along the front and back direction. The crane girder welding machine further comprises a movable frame driving device which is in transmission connection with the movable frame and drives the movable frame to reciprocate along the front and back direction. The movable frame is provided with a welding gun used for performing welding construction on a crane girder at the corresponding welding position to be welded. The crane girder welding machine can reduce labor strength of workers in the welding manufacture of the crane girder.
Description
Technical field
The utility model relates to and is used for the crane girder bonding machine that crane girder is made.
Background technology
Crane girder comprises that shape of cross section is the beam box of U-lag shape, is arranged at beam box both sides notch along the side plate of locating with two I-steel between the side plate are set respectively; Wherein the lower end of each side plate is connected with the cell wall upper end welding of corresponding beam box respectively, and the upper end of each side plate is connected with the corresponding coxostermum welding of I-steel respectively.The welding that will accomplish a crane girder in other words needs the welding procedure of four weld seams; Existing construction method is earlier a side weld easily to be welded through manual work; Through turning device crane grider overturning is come then, carry out the welding procedure of opposite side weld seam again.There is following shortcoming in this welding procedure through manual work: 1, and working strength of workers is bigger; Article 2, four, the asynchronous welding procedure of weld seam, welding efficiency is lower, also makes the welding stress of each weld seam bigger, is easy to generate welding deformation, influences welding quality; 3, during artificial the welding, must use turning device that crane girder is overturn, the use of turning device has not only increased the equipment needed thereby in the crane girder manufacture process, also increases the man-hour of overturning simultaneously, has increased the manufacturing cost of crane girder.
Summary of the invention
It is a kind of in the crane girder welding is made that the purpose of the utility model is to provide, and can reduce the crane girder bonding machine of labor strength.
In order to address the above problem, the technical scheme of the utility model is:
The crane girder bonding machine; The adjustable shelf that comprises fixed mount and upper edge fore-and-aft direction thereof guiding slidable fit; Described crane girder bonding machine comprises also and is in transmission connection with said adjustable shelf and drives said adjustable shelf along the reciprocating adjustable shelf drive unit of fore-and-aft direction that described adjustable shelf is provided with the welding gun that is used for the place to be welded of corresponding crane girder is carried out welding procedure.
Described welding gun links to each other with the correspondence position of said adjustable shelf through corresponding guiding mechanism respectively, and described guiding mechanism comprises angle regulator that the vertical adjustment device that is used for Butt welding gun and adjusts along the vertical direction, the rotational angle that is used for Butt welding gun are adjusted and the radiai adjustment device that is used to adjust distance between welding gun and the corresponding place to be welded.
Described vertical adjustment device comprises the head end suspended wall of slidable fit on said adjustable shelf along the vertical direction; The end of said suspended wall extends towards the place to be welded of corresponding crane girder; Described vertical guiding mechanism comprises that also the slidable fit that leads along the vertical direction is in the welding gun secondary vertical adjustment structure of the end of suspended wall; Described angle regulator comprises that pivot center is assemblied in angle adjustment mechanism of the structural welding gun of said welding gun secondary vertical adjustment along the rotation that fore-and-aft direction extends; Described angle regulator comprises that also pivot center is assemblied in the welding gun secondary angle adjustment mechanism on angle adjustment mechanism of said welding gun along the rotation that fore-and-aft direction extends; Described radiai adjustment device comprises guiding slidable fit radiai adjustment structure of welding gun on said welding gun secondary angle adjustment mechanism; The glide direction of a radiai adjustment structure of described welding gun is perpendicular to the pivot center of said welding gun secondary angle adjustment mechanism; Described radiai adjustment device comprises that also the guiding slidable fit is in a structural welding gun secondary of radiai adjustment of said welding gun radiai adjustment structure; The glide direction of a radiai adjustment structure of the glide direction of said welding gun secondary radiai adjustment structure and said welding gun is consistent, and described welding gun is arranged on the described welding gun secondary radiai adjustment structure.
Described welding gun comprises the following welding gun that is used for welding procedure is carried out in respective side panels and beam box junction and the last welding gun that is used for welding procedure is carried out in respective side panels and I-steel junction, described guiding mechanism respectively with the corresponding one by one setting of said each upper and lower welding gun.
Two stiles that described adjustable shelf is set up in parallel along left and right directions and be set up in the horizontal frame between two stiles; Described each time welding gun links to each other with said stile through each self-corresponding guiding mechanism respectively, described on each welding gun pass through each self-corresponding guiding mechanism respectively and link to each other with said horizontal frame.
Described guiding mechanism also comprises and is respectively applied for the vertical drive that drives said suspended wall and welding gun secondary vertical adjustment structure knee-action, is respectively applied for the device of rotation driving that drives angle adjustment mechanism of said welding gun and welding gun secondary angle adjustment mechanism rotation action and is respectively applied for and drive the radial drive that radiai adjustment structure of said welding gun and welding gun secondary radiai adjustment structure radially slide, described crane girder bonding machine also comprise with institute vertical drive, device of rotation driving and radial drive control connection to control the control system that corresponding drive unit output adjustment is moved.
Described control system also carries out welding procedure to control said welding gun to corresponding place to be welded with said welding gun control connection.
Also be provided with the detecting sensor that is used to detect corresponding place to be welded shape information on described welding gun or the welding gun secondary radiai adjustment structure, described control system connects to control corresponding guiding mechanism output adjustment action according to sampled result with said detecting sensor sampling moves with corresponding welding gun output welding.
Described welding gun is compound welding gun; Described compound welding gun comprises the combination gun head; Be provided with in the described combination gun head and be used for the channel of welding wire that corresponding welding wire passes through; Outer periphery in said channel of welding wire in the described combination gun head is useful on the gas passage of implementing output protection gas in man-hour in corresponding welding wire welding, and the outer periphery in said gas passage in the described combination gun head is useful on the corresponding solder flux of output corresponding weld seam is carried out the solder flux passage of submerged-arc welding construction.
The beneficial effect of the utility model is: welding gun is arranged on the travelling carriage, and travelling carriage can be accomplished the welding procedure to corresponding weld seam on the crane girder in sliding process, does not need to weld manually, has reduced working strength of workers.
Further; I-steel comes welding procedure with two weld seams that side plate connects by corresponding last welding gun; Side plate comes welding procedure with two weld seams that the beam box connects by corresponding following welding gun, once just can accomplish the construction action of four weld seams, four synchronous welding procedures of weld seam; Reduced the welding stress of each weld seam, welded not yielding.Simultaneously in welding process, do not need turning device that crane girder is overturn yet, reduced the manufacturing cost of crane girder.
Further,, make to keep reasonably welding distance between welding gun and the corresponding place to be welded, guaranteed the construction quality of welding gun welding procedure through of the position adjustment of corresponding guiding mechanism to corresponding welding gun.
Description of drawings
Fig. 1 is the structural representation of the utility model embodiment;
Fig. 2 is the side view of Fig. 1;
Fig. 3 is the A place enlarged drawing among Fig. 1;
Fig. 4 is the structural representation of combination gun head among the crane girder bonding machine embodiment.
The specific embodiment
The embodiment of crane girder bonding machine is shown in Fig. 1 ~ 4: comprise frame 14; Frame comprises the travelling carriage 14-2 of fixed mount 14-1 and upper edge fore-and-aft direction guiding slidable fit thereof; Adjustable shelf 14-2 comprises left stile 14-2-1, the right vertical frame 14-2-2 of lower end and fixed mount 14-1 guiding slidable fit and is set up in the horizontal frame 14-2-3 of left and right stile upper end; Left and right stile and horizontal frame 14-2-3 constitute " door " font structure; Between adjustable shelf 14-2 and fixed mount 14-1, be provided with and drive adjustable shelf motor and the adjustable shelf pinion and rack that adjustable shelf 14-2 moves along fore-and-aft direction; Wherein the output of gear in the adjustable shelf pinion and rack and adjustable shelf motor is in transmission connection, and the tooth bar in the adjustable shelf pinion and rack links to each other with adjustable shelf.On left and right stile, be respectively equipped with and be used for following welding gun 5 that respective beam box 12-1 and side plate 12-2 junction are welded; Be provided with on the horizontal frame 14-2-3 two be respectively applied for that two junctions that respective side panels 12-2 is connected with I-steel 12-3 weld on welding gun 3; Go up welding gun 3 and two following welding guns 5 for two and be the compound welding gun of can gas protecting weldering and submerged-arc welding while welding procedure; Compound welding gun comprises combination gun head 39; Be provided with in the combination gun head 39 and be used for the channel of welding wire 35 that corresponding welding wire passes through; Outer periphery in channel of welding wire 35 in the combination gun head 39 is useful on the gas passage 36 of implementing output protection gas in man-hour in corresponding welding wire welding, and the outer periphery in gas passage 36 in the combination gun head 39 is useful on the corresponding solder flux 38 of output corresponding weld seam is carried out the solder flux passage 37 of submerged-arc welding construction, through the use of combination gun head 39 gas is protected combining of weldering and submerged-arc welding science; Thereby innovation forms a kind of compound welding fabrication technology; This welding manner plays one's part to the full the advantage of two kinds of welding procedures, has obtained extraordinary effect, is that the weld appearance or the depth of weld, inherent quality all improve a lot than traditional single welding manner.
Each time welding gun 5 links to each other with corresponding stile through corresponding following guiding mechanism, and following guiding mechanism comprises the following vertical adjustment device continuous with corresponding stile, is assemblied in the lower angle adjusting device on the said vertical adjustment device down and is assemblied in the following radiai adjustment device on the lower angle adjusting device.Following vertical adjustment device comprises the head end following suspended wall 27 of slidable fit on corresponding stile that lead along the vertical direction; The end of following suspended wall 27 extends towards said " door " font inside configuration; Vertical guiding mechanism also comprises the following welding gun secondary vertical adjustment structure 19 of the end of the slidable fit suspended wall 27 under correspondence that leads along the vertical direction down; The lower angle adjusting device comprises that pivot center is assemblied in down the angle adjustment mechanism 22 of following welding gun on the welding gun secondary vertical adjustment structure 19 along the rotation that fore-and-aft direction extends; The lower angle adjusting device comprises that also the rotation that pivot center extends along fore-and-aft direction is assemblied in the following welding gun secondary angle adjustment mechanism 23 on said angle adjustment mechanism 22 of welding gun down; Following radiai adjustment device comprises guiding slidable fit radiai adjustment structure 20 of following welding gun on following welding gun secondary angle adjustment mechanism 23; The glide direction of a radiai adjustment structure 20 of following welding gun is perpendicular to the said pivot center of welding gun secondary angle adjustment mechanism 23 down; The radiai adjustment device also comprises the following welding gun secondary radiai adjustment structure 21 of guiding slidable fit on following radiai adjustment structure 20 of welding gun; The glide direction of a radiai adjustment structure 20 of the glide direction of following welding gun secondary radiai adjustment structure 21 and following welding gun is consistent, and each time welding gun 5 is arranged at respectively on the corresponding following welding gun secondary radiai adjustment structure 21.Welding gun 3 links to each other with said horizontal frame through corresponding last guiding mechanism respectively on each, described last guiding mechanism comprises the last vertical adjustment device that links to each other with said horizontal frame 14-2-3, be assemblied in said on the vertical adjustment device the upper angle adjusting device and be assemblied in the last radiai adjustment device on the said lower angle adjusting device.Last vertical adjustment device comprises the head end upper suspending wall 30 of slidable fit on said horizontal frame 14-2-3 that lead along the vertical direction; The end of upper suspending wall 30 extends towards said " door " font inside configuration; Go up vertical guiding mechanism and comprise that also the slidable fit that leads along the vertical direction is in the last welding gun secondary vertical adjustment structure 16 of the end of said upper cantilever 30; The upper angle adjusting device comprises that pivot center is assemblied in the angle adjustment mechanism 25 of last welding gun on the welding gun secondary vertical adjustment structure 16 along the rotation that fore-and-aft direction extends; The upper angle adjusting device comprises that also the rotation that pivot center extends along fore-and-aft direction is assemblied in the said last welding gun secondary angle adjustment mechanism 26 that goes up on angle adjustment mechanism 25 of welding gun; Last radiai adjustment device comprises guiding slidable fit radiai adjustment structure 13 of last welding gun on last welding gun secondary angle adjustment mechanism 26; The glide direction of a radiai adjustment structure 13 of last welding gun is perpendicular to the pivot center of last welding gun secondary angle adjustment mechanism 26; Last radiai adjustment device also comprises the guiding slidable fit in the said last welding gun secondary radiai adjustment structure 2 that goes up on radiai adjustment structure 13 of welding gun, and the glide direction of last welding gun secondary radiai adjustment structure 2 is consistent with the glide direction of a said upward radiai adjustment structure 13 of welding gun.
Upper and lower guiding mechanism also includes and is respectively applied for the vertical drive that drives corresponding upper and lower suspended wall and upper and lower welding gun secondary vertical adjustment structure knee-action, be respectively applied for the device of rotation driving that drives angle adjustment mechanism of upper and lower welding gun and upper and lower welding gun secondary angle adjustment mechanism rotation action, be respectively applied for and drive the radial drive that radiai adjustment structure of upper and lower welding gun and upper and lower welding gun secondary radiai adjustment structure radially slide; Wherein vertical drive is made up of motor, reductor, gear and the tooth bar of correspondence; Device of rotation driving is made up of the motor and the gear pair of correspondence, and radial drive is made up of corresponding cylinder.The crane girder bonding machine also comprises the control system that is used to control each welding gun output welding action, and the control system adjusts action with vertical drive, device of rotation driving and radial drive control connection to control corresponding drive unit output.The crane girder bonding machine also comprises automatic tracking system; Automatic tracking system is being undertaken the important task for control systematic collection information; Follow the tracks of navigation information and feed back to the control system, adjust orientation, welding current, weld seam size and vertical drive, device of rotation driving and the radial drive of each welding gun through analyzing and processing at any time and correctly work.Automatic tracking system comprises and is arranged at the guide wheel on the welding gun on each; Be equipped with in the guide wheel can detect weld shape change with the guide wheel angle and with control the sensor that systematic sampling is connected; Sensor is converted into the signal of telecommunication with change in displacement; After the signal of telecommunication is passed to control system analysis, each the drive unit output adjustment action in the control system command in the guiding mechanism.Automatic tracking system also comprise be provided with on each time welding gun with the probe sensor that is connected of control systematic sampling, probe sensor has and is used for and the place to be welded contact matching of respective side panels and the beam box probe with the shape information at the place to be welded of detection side plate and beam box.The crane girder bonding machine also comprises welding gun cooling system and solder flux auto-collection system 11, and the welding gun cooling system is for after preventing that welding gun from working long hours, and the welding gun temperature is too high and burn welding machine, and wire feed system adopts the forced circulation water-cooled but to lower the temperature.For collect more than solder flux; The solder flux auto-collection system adopts negative pressure suction and pumping principle; Comprise solder flux gathering-device and screening plant, the solder flux gathering-device collects unnecessary solder flux around the weld seam that welds completion, sends into the welding compound feed bin automatically through screening plant and recycles.Part 1 and 6 representes to control the control flow of corresponding welding machine respectively among the figure.
During use; Each parts of forming crane girder 12 are placed between left and right stile along fore-and-aft direction; When welding is initial; Through the control system each upper and lower guiding mechanism is adjusted; The vertical drive that constitutes through corresponding motor, reductor, gear and tooth bar drives each upper and lower suspended wall respectively and the vertical secondary adjustment structure of upper and lower welding gun is carried out the upper-lower position adjustment of each welding gun, and upper and lower suspended wall plays a part on a large scale, coarse adjustment, and the vertical secondary adjustment structure of upper and lower welding gun plays a part among a small circle, finely tunes; The device of rotation driving that constitutes through corresponding motor and gear pair drives the angle adjustment that angle adjustment mechanism of each upper and lower welding gun and secondary angle adjustment mechanism are carried out each welding gun; Angle adjustment mechanism of upper and lower welding gun plays a part on a large scale, coarse adjustment, and upper and lower welding gun secondary angle adjustment mechanism plays a part among a small circle, finely tunes; The radial drive that constitutes through corresponding cylinder drives radiai adjustment structure of each upper and lower welding gun respectively and upper and lower welding gun secondary radiai adjustment structure is carried out the position adjustment to each welding gun; Radiai adjustment structure of wherein upper and lower welding gun plays a part on a large scale, coarse adjustment, and upper and lower welding gun secondary radiai adjustment structure plays a part among a small circle, finely tunes.Adjustment through upper and lower guiding mechanism can realize many little, multi-angles of each welding gun and multi-faceted adjustment and location, finally realizes the accurate contraposition of each welding gun and corresponding weld seam.In each welding gun welding action, the adjustable shelf motor drives adjustable shelf through the adjustable shelf pinion and rack and moves along fore-and-aft direction, accomplishes the welding procedure to four weld seams of crane girder simultaneously then.
In other embodiment of the utility model: the adjustable shelf motor can also be by other pneumatic or fluid motor replace, the adjustable shelf pinion and rack also can be replaced by corresponding leading screw screw mechanism certainly; Certainly each welding gun can also adopt common welding gun structure, such as the gas of simple function is protected weldering welding gun or submerged-arc welding welding gun; Motor in the vertical drive, rack-and-pinion can also be replaced by corresponding cylinder or hydraulic cylinder, and when motor was replaced by pneumatic or fluid motor, rack-and-pinion can be replaced by corresponding leading screw screw certainly; All right hydraulic cylinder of the cylinder of radial drive or motor, rack-and-pinion replace; Certainly the order of connection of vertical adjustment device, angle regulator and radiai adjustment device can also change as required; Link to each other with adjustable shelf such as angle regulator; The vertical adjustment device links to each other with device for regulating rotary; This moment, the radiai adjustment device linked to each other with the vertical adjustment device, and other the relation of being linked in sequence can also be arranged certainly, at these no longer detailed row; The number of welding gun also can change according to the number of the required weld of crane girder; Certainly when the distance between each welding gun and the corresponding place to be welded need not adjusted, each guiding mechanism can also not established, and this moment can be through being directly fixed on each welding gun each corresponding position of adjustable shelf; Adjustable shelf can not be " door " font structure yet, and is replaced by other frame structure.
Claims (9)
1. crane girder bonding machine; It is characterized in that: the adjustable shelf that comprises fixed mount and upper edge fore-and-aft direction thereof guiding slidable fit; Described crane girder bonding machine comprises also and is in transmission connection with said adjustable shelf and drives said adjustable shelf along the reciprocating adjustable shelf drive unit of fore-and-aft direction that described adjustable shelf is provided with the welding gun that is used for the place to be welded of corresponding crane girder is carried out welding procedure.
2. crane girder bonding machine according to claim 1; It is characterized in that: described welding gun links to each other with the correspondence position of said adjustable shelf through corresponding guiding mechanism respectively, and described guiding mechanism comprises angle regulator that the vertical adjustment device that is used for Butt welding gun and adjusts along the vertical direction, the rotational angle that is used for Butt welding gun are adjusted and the radiai adjustment device that is used to adjust distance between welding gun and the corresponding place to be welded.
3. crane girder bonding machine according to claim 2; It is characterized in that: described vertical adjustment device comprises the head end suspended wall of slidable fit on said adjustable shelf along the vertical direction; The end of said suspended wall extends towards the place to be welded of corresponding crane girder; Described vertical guiding mechanism comprises that also the slidable fit that leads along the vertical direction is in the welding gun secondary vertical adjustment structure of the end of suspended wall; Described angle regulator comprises that pivot center is assemblied in angle adjustment mechanism of the structural welding gun of said welding gun secondary vertical adjustment along the rotation that fore-and-aft direction extends; Described angle regulator comprises that also pivot center is assemblied in the welding gun secondary angle adjustment mechanism on angle adjustment mechanism of said welding gun along the rotation that fore-and-aft direction extends; Described radiai adjustment device comprises guiding slidable fit radiai adjustment structure of welding gun on said welding gun secondary angle adjustment mechanism; The glide direction of a radiai adjustment structure of described welding gun is perpendicular to the pivot center of said welding gun secondary angle adjustment mechanism; Described radiai adjustment device comprises that also the guiding slidable fit is in a structural welding gun secondary of radiai adjustment of said welding gun radiai adjustment structure; The glide direction of a radiai adjustment structure of the glide direction of said welding gun secondary radiai adjustment structure and said welding gun is consistent, and described welding gun is arranged on the described welding gun secondary radiai adjustment structure.
4. crane girder bonding machine according to claim 3; It is characterized in that: described welding gun comprises the following welding gun that is used for welding procedure is carried out in respective side panels and beam box junction and the last welding gun that is used for welding procedure is carried out in respective side panels and I-steel junction, described guiding mechanism respectively with the corresponding one by one setting of said each upper and lower welding gun.
5. crane girder bonding machine according to claim 4; It is characterized in that: two stiles that described adjustable shelf is set up in parallel along left and right directions and be set up in the horizontal frame between two stiles; Described each time welding gun links to each other with said stile through each self-corresponding guiding mechanism respectively, described on each welding gun pass through each self-corresponding guiding mechanism respectively and link to each other with said horizontal frame.
6. crane girder bonding machine according to claim 3; It is characterized in that: described guiding mechanism also comprises and is respectively applied for the vertical drive that drives said suspended wall and welding gun secondary vertical adjustment structure knee-action, is respectively applied for the device of rotation driving that drives angle adjustment mechanism of said welding gun and welding gun secondary angle adjustment mechanism rotation action and is respectively applied for and drive the radial drive that radiai adjustment structure of said welding gun and welding gun secondary radiai adjustment structure radially slide, described crane girder bonding machine also comprise with institute vertical drive, device of rotation driving and radial drive control connection to control the control system that corresponding drive unit output adjustment is moved.
7. crane girder bonding machine according to claim 6 is characterized in that: described control system also carries out welding procedure to control said welding gun to corresponding place to be welded with said welding gun control connection.
8. crane girder bonding machine according to claim 7; It is characterized in that: also be provided with the detecting sensor that is used to detect corresponding place to be welded shape information on described welding gun or the welding gun secondary radiai adjustment structure, described control system connects to control corresponding guiding mechanism output adjustment action according to sampled result with said detecting sensor sampling moves with corresponding welding gun output welding.
9. according to any described crane girder bonding machine in the claim 1 ~ 8; It is characterized in that: described welding gun is compound welding gun; Described compound welding gun comprises the combination gun head; Be provided with in the described combination gun head and be used for the channel of welding wire that corresponding welding wire passes through; Outer periphery in said channel of welding wire in the described combination gun head is useful on the gas passage of implementing output protection gas in man-hour in corresponding welding wire welding, and the outer periphery in said gas passage in the described combination gun head is useful on the corresponding solder flux of output corresponding weld seam is carried out the solder flux passage of submerged-arc welding construction.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201220200327XU CN202555951U (en) | 2012-05-07 | 2012-05-07 | Crane girder welding machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201220200327XU CN202555951U (en) | 2012-05-07 | 2012-05-07 | Crane girder welding machine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202555951U true CN202555951U (en) | 2012-11-28 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201220200327XU Withdrawn - After Issue CN202555951U (en) | 2012-05-07 | 2012-05-07 | Crane girder welding machine |
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| Country | Link |
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| CN (1) | CN202555951U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102699497A (en) * | 2012-05-07 | 2012-10-03 | 河南省矿山起重机有限公司 | Crane main beam welding machine |
-
2012
- 2012-05-07 CN CN201220200327XU patent/CN202555951U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102699497A (en) * | 2012-05-07 | 2012-10-03 | 河南省矿山起重机有限公司 | Crane main beam welding machine |
| CN102699497B (en) * | 2012-05-07 | 2014-09-24 | 河南省矿山起重机有限公司 | Crane main beam welding machine |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20121128 Effective date of abandoning: 20140924 |
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| RGAV | Abandon patent right to avoid regrant |