CN1765705A - Automatic constant force binding spot-welding mechanism of automobile exhausted gas three-stage purifier - Google Patents

Automatic constant force binding spot-welding mechanism of automobile exhausted gas three-stage purifier Download PDF

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Publication number
CN1765705A
CN1765705A CN 200510110198 CN200510110198A CN1765705A CN 1765705 A CN1765705 A CN 1765705A CN 200510110198 CN200510110198 CN 200510110198 CN 200510110198 A CN200510110198 A CN 200510110198A CN 1765705 A CN1765705 A CN 1765705A
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China
Prior art keywords
welding
spot
support
binding
welding mechanism
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CN 200510110198
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CN100343124C (en
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李彦明
何创新
刘成良
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Shanghai Jiaotong University
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Shanghai Jiaotong University
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Publication of CN100343124C publication Critical patent/CN100343124C/en
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Abstract

The invention relates to an automatic constant-force binding spot welding device of vehicle tail gas ternary purifier product line, belonging to the mechanical technique. The invention comprises: a frame, a force sensor bracket, a force sensor, a force sensor connection block, a blanking cylinder, a blanking push plate, left welding torch integration, a position detecting sensor integration, a binding hydraulic cylinder connection block, a right welding torch integration, a spot welding bracket, a spot welding bracket movable rail, a spot welding bracket movable cylinder, a binding hydraulic cylinder, a feeding cylinder, a feeding push plate, a feeding rail, a binding belt, a binding bracket, a guiding rolling needle. The invention can automatically feed, constantly bind, spot weld and process blanking to meet the demand of automatic flow process line. The binding radius is adjustable; the binding force is detected and feedback by force sensor, and the invention can confirm stable constant force binding via the closed-loop control; the position of spot welding is accurate via detecting welding line via the position sensor; and the invention can meet the demand of feeding and transmitting material in batch in the vehicle tail gas ternary purifier automatic product line.

Description

Product line of ternary cleaner for tail gas automatic constantforce binding spot-welding mechanism
Technical field
What the present invention relates to is a kind of equipment of field of mechanical technique, relates in particular to a kind of product line of ternary cleaner for tail gas automatic constantforce binding spot-welding mechanism.
Background technology
Automobile exhaust purifier is the critical component of automobile, also is the indispensable parts of medium-to-high grade car.Along with the urban motor vehicle is increasing, vehicle exhaust emissions gross pollution air environment, can the automatic production line of ternary cleaner for tail gas realize production domesticization, and the independent development capability of China's automobile industry is had very big influence.The cluster simultaneous oxidation reduction catalyst, form by three class parts: housing (corrosion-resistant steel), liner (asbestos) and ceramic monolith, in whole production line, relate to a plurality of links, wherein the effect of automatic constantforce binding spot welding system is with constant force the three to be tied together, and in dual-side spot welding firmly, the purpose of constant force binding is to guarantee the binding quality, the conformability of seizing force when guaranteeing batch manufacturing, prevent tension and cause carrier cracked, or cross pine and cause the carrier play.The work efficiency of this operation and levels of precision have directly influenced the production efficiency and the quality of cleaner, are requisite links during cleaner is produced.In the domestic automobile exhaust purifier manufacturing line, there are two kinds of situations in the binding spot-welding equipment that cleaner is produced, the external automatic production lines of introducing, and complex structure costs an arm and a leg, and has increased productive costs, makes product price high.In the exhaust purifier manufacturing line of domestic-developed, the binding pinpoint welding procedure adopts the manual complete operation of workshop-trained man more, perhaps adds artificial spot welding with semi-automatic binding equipment, and labour intensity is big and product design is low, and degree of automation is not high, and production efficiency is low.
Find through literature search prior art, China's utility model patent " the carrier bind hider that exhaust purifier is used ", application number CN00221853.4, the day for announcing is August 8 calendar year 2001, this patent disclosure the carrier bind hider used of a kind of exhaust purifier: it comprises frame, pull lever, cylinder body, be arranged at the guide rail on the frame, one end of pull lever is connected with hand wheel by screw-nut body, the other end of pull lever is connected with piston in the cylinder body, piston will move by pressurized air and power passes to cylinder body, in the inner chamber of cylinder body compression indicator is housed, cylinder body and guide rail sliding block joint.Rotating behind the pulling piston by manual commentaries on classics opinion can be by the foreskin of cylinder body pulling parcel carrier, makes foreskin lock ring carrier, the conformability of seizing force in the time of can guaranteeing batch manufacturing according to manometric pressure reading.This carrier bind hider has the following disadvantages: [1] takes open loop control, the pulling force hand control, and reliability is low, and human eye reads pressure gauge reading, has personal error, and control accuracy is low; [2] charging blanking, binding spot welding is manual operations, and labour intensity is big, and production efficiency is low, can't satisfy production in enormous quantities; [3] this bind hider can only be used as the instrument of binding, does not have supporting with it charging cutting agency, can not realize operations automatically, can't satisfy the needs that automatic assembly line is produced.
Summary of the invention
The objective of the invention is at the deficiencies in the prior art, a kind of product line of ternary cleaner for tail gas automatic constantforce binding spot-welding mechanism is provided, make it automatic charging, blanking, the seizing force that automated closed-loop control is constant, and automatic accurate spot welding can be satisfied the demand that the product automation of different model, different size is produced.The present invention is simple and reliable for structure, enhances productivity, and reduces labor intensity.
The present invention is achieved by the following technical solutions, the present invention includes: frame, force gauge support, force gauge, force gauge contiguous block, blanking cylinder, blanking push pedal, left welding gun is integrated, position detection sensor is integrated, binding hydraulic actuating cylinder contiguous block, backhand welding rifle are integrated, spot-welding mechanism support, spot-welding mechanism support moving guide rail, spot-welding mechanism support move cylinder, binding hydraulic actuating cylinder, charging cylinder, charging push pedal, feeding guide, bundling belt, binding support, guiding needle roller.Annexation is: the force gauge support is welded at the frame front end, and force gauge one end is installed on the force gauge support, and the other end and force gauge contiguous block are fixedly connected; The force gauge contiguous block is supported on the guiding needle roller, and an end connects with the force gauge contiguous block, and the other end and bundling belt are fixedly connected.The guiding needle roller is placed on the binding support, can rotate the original place, and the binding support is welded on the frame.Bundling belt one end is connected with the force gauge contiguous block by bolt, and the other end is connected with binding hydraulic actuating cylinder contiguous block by bolt.Binding hydraulic actuating cylinder contiguous block is welded on binding hydraulic actuating cylinder push rod end, and the binding hydraulic actuating cylinder is fixed on the frame.Spot-welding mechanism support moving guide rail is fixed on the frame, the spot-welding mechanism support moves the end that cylinder is fixed on spot-welding mechanism support moving guide rail, the spot-welding mechanism support is installed on the spot-welding mechanism moving guide rail, spot-welding mechanism support one end is welded on spot-welding mechanism and moves the cylinder push-rod end, and the spot-welding mechanism support moves at the spot-welding mechanism support under the driving of cylinder and can reciprocatingly slide on the spot-welding mechanism support guide; The spot-welding mechanism support other end has dovetail furrow, left side welding gun is integrated, the backhand welding rifle is integrated and the integrated dovetail furrow that is installed in the spot-welding mechanism support of position detection sensor on, and can be free to slide along dovetail furrow, position detection sensor is integrated in the integrated and integrated centre of backhand welding rifle of left welding gun; Feeding guide is fixed on the frame, and the charging cylinder is fixed on feeding guide one end, and the charging push pedal is welded on the push rod end of charging cylinder, and the charging push pedal can move reciprocatingly under the promotion of the push rod of charging cylinder; The blanking cylinder is welded on the frame, and the blanking push pedal is welded on blanking cylinder push-rod end, and the blanking push pedal can move reciprocatingly under the promotion of blanking cylinder push-rod.
Described left welding gun is integrated, comprises welding gun support, welding rod arm, welding rod.Annexation is: the welding gun support is installed in the dovetail furrow on the spot-welding mechanism support noted earlier, can be free to slide along dovetail furrow, and the position of the relative spot-welding mechanism support of welding gun support is fixed by the fixing screw on the welding gun support.The welding rod arm is installed on the welding gun support by a via hole, and the welding rod arm can be free to slide and rotate by phase Butt welding gun support in via hole, and the position of welding rod arm phase Butt welding gun support is fixed by the fixing screw on the welding gun support.Welding rod is fixed on welding rod arm end.
Integrated and the left welding gun integrated mechanism of described backhand welding rifle is identical.
Integrated probe, feeler arm, the probe support of comprising of described position detection sensor.Annexation is: probe support is installed in the dovetail furrow on the spot-welding mechanism support noted earlier, can be free to slide along dovetail furrow, and the position of the relative spot-welding mechanism support of probe support is fixed by the fixing screw on the probe support.Feeler arm is installed on the probe support by a via hole on the probe support, and feeler arm can be free to slide and rotate relative to probe support in via hole, and the position of the relative probe support of feeler arm is fixed by the fixing screw on the probe support.Probe stationary is at the feeler arm end.
The needs that automatic assembly line is produced have been satisfied in the present invention's charging automatically, constant force binding, spot welding, blanking.The binding radius is adjustable; Seizing force is detected and feedback by force gauge, by closed loop control, has guaranteed more stable constant force binding; Detect weld seam by position transduser, the spot welding position is accurate; Mechanism is simple and reliable, has especially satisfied the demand that the upper and lower charge amount of ternary cleaner for tail gas automatic production line is produced.The present invention can satisfy the constant force binding spot welding automation of different model, different size and tie up spot welded needs greatly.
Description of drawings
Fig. 1 is a structural representation of the present invention
Fig. 2 is a front elevation of the present invention
Fig. 3 is a right elevation of the present invention
The element title of each figure number representative is as follows among the figure:
Frame 1, force gauge support 2, force gauge 3, force gauge contiguous block 4, blanking cylinder 5, blanking push pedal 6, left side welding gun integrated 7, position detection sensor integrated 8, binding hydraulic actuating cylinder contiguous block 9, backhand welding rifle integrated 10, spot-welding mechanism support 11, spot-welding mechanism support moving guide rail 12, the spot-welding mechanism support moves cylinder 13, binding hydraulic actuating cylinder 14, charging cylinder 15, charging push pedal 16, feeding guide 17, bundling belt 18, binding support 19, guiding needle roller 20, probe 21, feeler arm 22, probe support 23, welding gun support 24, welding rod arm 25, welding rod 26.
The specific embodiment
As shown in Figure 1 to Figure 3, the present invention includes: frame 1, force gauge support 2, force gauge 3, force gauge contiguous block 4, blanking cylinder 5, blanking push pedal 6, left welding gun are integrated 7, position detection sensor is integrated 8, binding hydraulic actuating cylinder contiguous block 9, backhand welding rifle are integrated 10, spot-welding mechanism support 11, spot-welding mechanism support moving guide rail 12, spot-welding mechanism support move cylinder 13, binding hydraulic actuating cylinder 14, charging cylinder 15, charging push pedal 16, feeding guide 17, bundling belt 18, binding support 19, guiding needle roller 20.Annexation is: force gauge support 2 is welded at frame 1 front end, force gauge 3 one ends are installed on the force gauge support 2, the other end and force gauge contiguous block 4 are fixedly connected, force gauge contiguous block 4 is supported on the guiding needle roller 20, one end connects with force gauge 2, and the other end and bundling belt 18 are fixedly connected.Guiding needle roller 20 is placed on the binding support 19, can freely rotate, and binding support 19 is welded on the frame 1.Bundling belt 18 1 ends are connected with force gauge contiguous block 4 by bolt, and the other end is connected with binding hydraulic actuating cylinder contiguous block 9 by bolt.Binding hydraulic actuating cylinder contiguous block 9 is welded on binding hydraulic actuating cylinder 14 push rod ends, and binding hydraulic pressure is fixed on the frame 1.Spot-welding mechanism support moving guide rail 12 is fixed on the frame 1, the spot-welding mechanism support moves the end that cylinder 13 is fixed on spot-welding mechanism support moving guide rail 12, spot-welding mechanism support 11 is installed on the spot-welding mechanism support moving guide rail 12, spot-welding mechanism support 11 1 ends are welded on the spot-welding mechanism support and move cylinder 13 push rod ends, and spot-welding mechanism support 11 moves at the spot-welding mechanism support under the driving of cylinder 13 and can reciprocatingly slide on spot-welding mechanism support guide 12; Spot-welding mechanism support 11 other ends have dovetail furrow, left side welding gun is integrated 7, backhand welding rifle integrated 10 and position detection sensor integrated 8 are installed on the dovetail furrow of spot-welding mechanism support 11, and can be free to slide along dovetail furrow, position detection sensor integrated 8 is in the middle of left welding gun integrated 7 and backhand welding rifle integrated 10; Feeding guide 17 is fixed on the frame 1, and charging cylinder 15 is fixed on feeding guide 17 1 ends, and charging push pedal 16 is welded on the push rod end of charging cylinder 15, and charging push pedal 16 can move reciprocatingly under the promotion of the push rod of charging cylinder 15; Blanking cylinder 5 is welded on the frame 1, and blanking push pedal 6 is welded on blanking cylinder 5 push rod ends, and blanking push pedal 6 can move reciprocatingly under the promotion of blanking cylinder 5 push rods.
Described left welding gun is integrated 7, comprises welding gun support 24, welding rod arm 25, welding rod 26.Annexation is: welding gun support 24 is installed in the dovetail furrow on the spot-welding mechanism support 11 noted earlier, can be free to slide along dovetail furrow, the position of welding gun support 24 relative spot-welding mechanism supports 11 can be by tightening the screw retention that is used for welding gun support 24 location on the welding gun support 24.Welding rod arm 25 is installed on the welding gun support 24 by a via hole, welding rod arm 25 can be free to slide and rotate by phase Butt welding gun support 24 in via hole, and the position of welding rod arm 25 phase Butt welding gun supports 24 can be by tightening the screw retention that is used for welding rod arm 25 location on the welding gun support 24.Welding rod 26 is fixed on welding rod arm 25 ends.
Described backhand welding rifle integrated 10 is identical with integrated 7 structures of left welding gun.
Described position detection sensor integrated 8 comprises probe 21, feeler arm 22, probe support 23.Annexation is: probe support 23 is installed in the dovetail furrow on the spot-welding mechanism support 11 noted earlier, can be free to slide along dovetail furrow, the position of probe support 22 relative spot-welding mechanism supports 11 can be by tightening the screw retention that is used for probe support 22 location on the probe support 22.Feeler arm 22 is installed on the probe support 23 by a via hole on the probe support 23, feeler arm 22 can be free to slide and rotate relative to probe support 23 in via hole, and the position of feeler arm 22 relative probe supports 23 can be by tightening the screw retention that is used for feeler arm 22 location on the probe support 23.Probe 21 is fixed on feeler arm 22 ends.
In conjunction with the accompanying drawings the present invention is further described with embodiment below:
Reel (stainless steel material), bedding and padding and carrier are fitted together by a last operation, and carrier and bedding and padding are contained in the reel, and reel has folded edge, and unification is referred to as the triple zoarium with reel, bedding and padding and the carrier that is fitted together below.Wait to bundle the radius value and the reel length of triple zoarium according to batch manufacturing, set the seizing force size in advance, adjust that left welding gun is integrated 7, backhand welding rifle integrated 10 and the position of position detection sensor integrated 8 on spot-welding mechanism support 11, and tighten the fixing screw of welding gun support 24 and the fixing screw of probe support 23 positions, adjust left and right welding rod arm 25 positions, and the fixing screw location of tightening welding rod arm 25, adjust feeler arm 22 positions, and tighten the fixing screw location of feeler arm 22.
1) the triple zoarium is delivered on feeding guide 17 waiting positions from a last operation by feeding mechanical hand;
2) charging cylinder 15 push rods stretch out, and charging push pedal 16 promotes the triple zoarium and enters in the bundling belt 18;
3) binding hydraulic actuating cylinder 14 push rods contraction pulling bundling belt 18, force gauge 3 feedback pulling force sizes through controller PID closed loop control flow proportion valve, and then are adjusted the stroke that bundlees hydraulic actuating cylinder 14 push rods, keep constant seizing force;
4) the spot-welding mechanism support moves cylinder 13 and promotes spot-welding mechanism supports 11 and move forward, and when probe is run into the folded edge of reel, promptly detects the spot welding position, and spot-welding mechanism support 11 is locked on this position;
5) welding rod energising, spot welding is finished and is cut off the power supply fast;
6) charging cylinder 15 push rods drive charging push pedal 16 and are contracted to initial position;
7) binding hydraulic actuating cylinder 14 push rods stretch out, and bundling belt 18 unclamps and bundlees the triple zoarium that a little welds;
8) blanking cylinder 5 push rods stretch out, and promote the fit end of triple through blanking push pedal 6, release from bundling belt 18, and the triple zoarium moves to the waiting position on the feeding guide 17;
9) blanking cylinder 5 push rods drive blanking push pedal 6 and are contracted to initial position;
10) feeding mechanical hand clamping triple zoarium leaves feeding guide 17, moves to next processing unit.
Repetitive operation 1) to 10), can realize the continuous automatic production of product line of ternary cleaner for tail gas automatic constantforce binding spot-welding group.

Claims (10)

1, a kind of product line of ternary cleaner for tail gas automatic constantforce binding spot-welding mechanism, comprise: frame (1), force gauge support (2), force gauge (3), force gauge contiguous block (4), blanking cylinder (5), blanking push pedal (6), left side welding gun integrated (7), position detection sensor integrated (8), binding hydraulic actuating cylinder contiguous block (9), backhand welding rifle integrated (10), spot-welding mechanism support (11), spot-welding mechanism support moving guide rail (12), the spot-welding mechanism support moves cylinder (13), binding hydraulic actuating cylinder (14), charging cylinder (15), charging push pedal (16), feeding guide (17), bundling belt (18), binding support (19), guiding needle roller (20), it is characterized in that, force gauge support (2) is welded at frame (1) front end, force gauge (3) one ends are located on the force gauge support (2), the other end and force gauge contiguous block (4) are fixedly connected, force gauge contiguous block (4) is supported on the guiding needle roller (20), guiding needle roller (20) is arranged on the binding support (19), binding support (19) is welded on the frame (1), bundling belt (18) one ends are connected with force gauge contiguous block (4), the other end is connected with binding hydraulic actuating cylinder contiguous block (9), binding hydraulic actuating cylinder contiguous block (9) is welded on binding hydraulic actuating cylinder (14) push rod end, binding hydraulic pressure is fixed on the frame (1), spot-welding mechanism support moving guide rail (12) is fixed on the frame (1), the spot-welding mechanism support moves the end that cylinder (13) is fixed on spot-welding mechanism support moving guide rail (12), spot-welding mechanism support (11) is arranged on the spot-welding mechanism support moving guide rail (12), left side welding gun integrated (7), backhand welding rifle integrated (10) and position detection sensor integrated (8) are arranged on the spot-welding mechanism support (11), position detection sensor integrated (8) is middle at left welding gun integrated (7) and backhand welding rifle integrated (10), feeding guide (17) is fixed on the frame (1), charging cylinder (15) is fixed on feeding guide (17) one ends, charging push pedal (16) is welded on the push rod end of charging cylinder (15), blanking cylinder (5) is welded on the frame (1), and blanking push pedal (6) is welded on the push rod end of blanking cylinder (5).
2, product line of ternary cleaner for tail gas automatic constantforce binding spot-welding mechanism according to claim 1, it is characterized in that, spot-welding mechanism support (11) one ends are welded on the spot-welding mechanism support and move cylinder (13) push rod end, spot-welding mechanism support (11) other end has dovetail furrow, and left welding gun integrated (7), backhand welding rifle integrated (10) and position detection sensor integrated (8) are arranged on the dovetail furrow of spot-welding mechanism support (11).
3, product line of ternary cleaner for tail gas automatic constantforce binding spot-welding mechanism according to claim 1, it is characterized in that, described left welding gun integrated (7), comprise welding gun support (24), welding rod arm (25), welding rod (26), welding gun support (24) is arranged on the spot-welding mechanism support (11), welding rod arm (25) is arranged on the welding gun support (24) by a via hole, and welding rod (26) is fixed on welding rod arm (25) end.
4, product line of ternary cleaner for tail gas automatic constantforce binding spot-welding mechanism according to claim 3, it is characterized in that, welding gun support (24) position of spot-welding mechanism support (11) is relatively fixed by the fixing screw on the welding gun support (24), and the position of welding rod arm (25) phase Butt welding gun support (24) is gone up fixing screw by welding gun support (24) and fixed.
According to claim 3 or 4 described product line of ternary cleaner for tail gas automatic constantforce binding spot-welding mechanisms, it is characterized in that 5, welding gun support (24) is arranged in the dovetail furrow on the spot-welding mechanism support (11), is free to slide along dovetail furrow.
6, product line of ternary cleaner for tail gas automatic constantforce binding spot-welding mechanism according to claim 1 is characterized in that, described backhand welding rifle integrated (10) is identical with left welding gun integrated (7) structure.
7, product line of ternary cleaner for tail gas automatic constantforce binding spot-welding mechanism according to claim 1, it is characterized in that, described position detection sensor integrated (8), comprise probe (21), feeler arm (22), probe support (23), probe support (23) is arranged on the spot-welding mechanism support (11), feeler arm (22) is arranged on the probe support (23) by the last via hole of probe support (23), and probe (21) is fixed on feeler arm (22) end.
8, product line of ternary cleaner for tail gas automatic constantforce binding spot-welding mechanism according to claim 7, it is characterized in that, probe support (22) position of spot-welding mechanism support (11) is relatively fixed by the fixing screw on the probe support (22), and feeler arm (22) position of probe support (23) is relatively fixed by the fixing screw on the probe support (23).
According to claim 7 or 8 described product line of ternary cleaner for tail gas automatic constantforce binding spot-welding mechanisms, it is characterized in that 9, probe support (23) is arranged in the dovetail furrow on the spot-welding mechanism support (11), can be free to slide along dovetail furrow.
10, according to claim 3 or 7 described product line of ternary cleaner for tail gas automatic constantforce binding spot-welding mechanisms, it is characterized in that, welding rod arm (25) phase Butt welding gun support (24) in via hole is free to slide and rotates, and feeler arm (22) is free to slide and rotates relative to probe support (23) in via hole.
CNB200510110198XA 2005-11-10 2005-11-10 Automatic constant force binding spot-welding mechanism of automobile exhausted gas three-stage purifier Expired - Fee Related CN100343124C (en)

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CNB200510110198XA CN100343124C (en) 2005-11-10 2005-11-10 Automatic constant force binding spot-welding mechanism of automobile exhausted gas three-stage purifier

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Application Number Priority Date Filing Date Title
CNB200510110198XA CN100343124C (en) 2005-11-10 2005-11-10 Automatic constant force binding spot-welding mechanism of automobile exhausted gas three-stage purifier

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CN100343124C CN100343124C (en) 2007-10-17

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103071906A (en) * 2013-01-31 2013-05-01 长城汽车股份有限公司 Loading device of automatic spot welding device
CN108568588A (en) * 2018-07-07 2018-09-25 温州市贝佳福自动化技术有限公司 Welding and detection integral type flexible manufacturing assembly line
CN111545889A (en) * 2020-04-30 2020-08-18 中核北方核燃料元件有限公司 Floating welding gun for pressurized water reactor annular fuel assembly framework

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE790601A (en) * 1971-11-15 1973-02-15 Fmc Corp APPARATUS FOR STRAPPING THE PACKAGES BY MEANS OF A HEAT-WELDING TAPE
DE19523274A1 (en) * 1995-06-27 1997-01-09 Mosca G Maschf Machine for tying up packages with especially weldable plastic band - has guide frame with band-conveyor, with drive wheel and two pressure wheels
CN2239392Y (en) * 1995-09-14 1996-11-06 张经良 Full automatic bundler
JP3318258B2 (en) * 1998-03-17 2002-08-26 大蔵工業株式会社 Obi machine

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103071906A (en) * 2013-01-31 2013-05-01 长城汽车股份有限公司 Loading device of automatic spot welding device
CN103071906B (en) * 2013-01-31 2015-08-05 长城汽车股份有限公司 A kind of feeding device of automatic spot welding equipment
CN108568588A (en) * 2018-07-07 2018-09-25 温州市贝佳福自动化技术有限公司 Welding and detection integral type flexible manufacturing assembly line
CN108568588B (en) * 2018-07-07 2023-10-31 北京龙鼎骁杰科技有限公司 Welding and detecting integrated flexible manufacturing assembly line
CN111545889A (en) * 2020-04-30 2020-08-18 中核北方核燃料元件有限公司 Floating welding gun for pressurized water reactor annular fuel assembly framework
CN111545889B (en) * 2020-04-30 2022-02-18 中核北方核燃料元件有限公司 Floating welding gun for pressurized water reactor annular fuel assembly framework

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