CN207119898U - A kind of weld clamp device - Google Patents

Abstract

It the utility model is related to a kind of weld clamp device, including clamping unit, clamping arm unit, constant clamping force control unit, main pin；Clamping arm unit includes the second transmission arm, the first transmission arm；Clamping unit is rotatablely connected by main pin, and the second transmission arm is fixedly connected with clamping unit near-end, and the first transmission arm is fixedly connected with the distal end of clamping unit；Constant clamping force control unit has body and expansion link, and expansion link end is rotatablely connected with the first transmission arm, and body and the second transmission arm are rotatablely connected；Positioned at the both sides of main pin, provided with limited block, limited block is used to limit opening angle during clamping device undamped state.The clamping process and release process of the utility model constant clamping force control unit, the action process of the top and the bottom of clamping unit is all divided into two steps, when completing second step action respectively by being positioned by blessing workpiece and limited block, ingenious in design, the degree of accuracy of clamped position is high.

Description

A kind of weld clamp device

Technical field

It the utility model is related to automobile automatic welding field, more particularly to a kind of clamping of automobile automatic laser welding Device.

Background technology

In automobile automatic welding field, the welding quality of Laser Welding requires high to the matching between part, during welding Stable clamping welding quality plays very important effect between workpiece, how by the stable clamping of workpiece and to disappear during welding Except matching gap is the difficult point of doorframe laser fusion welding, the clamping mode of production line is only capable of light source Jiao in Laser Welding manipulator at present The artificial arrangement clamping point in front portion of point, and the move mode in manipulator welding process when clamping point region is welded is hard sliding Move, welding quality can be caused undesirable.

One complete production procedure of car as shown in figure 1, wherein formally start production before 8 weeks " pre- volume licensing is whole Car " manufacture link is the key link before new model starting production, is important bridge of the product design to production.Simultaneously " pre- The accreditation vehicle in batches " stage, which also needs to many important vehicles, to be needed to deliver Very Important Person, such as：100000 kilometers of road is durable Instruction carriage, collision car, Konzern's contrast car, exhibition car, the stiffness test car of dynamic comprehensive experiment and strength test car, leader's examination multiply Test ride, externally checking car etc..Because the stamping parts in " the pre- batch accreditation vehicle " stage is of low quality, fixture is short delivery cycle, Matching somebody with somebody for fixture is set low, and vehicle body production quantity is more, and Laser Welding station is the bottleneck station in whole " pre- volume licensing vehicle " stage (needing to complete the processes such as roof soldering, the soldering of gusset water falling groove, the soldering of bonnet outside plate, gusset door opening melting welding in this station).

At present, the gusset doorframe of domestic most automobiles is all resistance spot welding, and only a small number of producers employ Laser Welding Connect.For the laser fusion welding technique of inside and outside gusset plate, technical process is typically：1. dolly is pushed away manually and vehicle vehicle body enters laser Room；2. manually declining vehicle body, fall into the positioning unit on flexible locating platform, positioning clamping is carried out to vehicle body, and 3. laser melts Weldering robot welds to vehicle body；4. clamping and positioning unit on vehicle body, hand hoisting are opened after the completion of unilateral gusset plate weld After dolly accepts vehicle body, and dolly band vehicle body is hauled out outside laser room together；5. after vehicle body is turned into 180 °, then vehicle body is pushed into Laser room；6. manually declining vehicle body, fall into again in the positioning unit on flexible locating platform, locating clip is carried out to vehicle body Tightly；7. laser fusion welding robot welds to vehicle body again；8. clamping and positioning unit on vehicle body is opened after completing welding, manually After lifting truck accepts vehicle body, haul out outside laser room, complete welding.

Clamping device can be installed by Laser Welding machinery in the prior art to complete to clamp and weld on hand at present.But The device can solve a large amount of C-type clamps dismounting problems to a certain extent, but the product except it is expensive, delivery date is long, dimension Repair response not in time, Site Service do not catch up with etc. outside many adverse conditions, also there are many deficiencies in product, such as in itself：

1. product slides clamping firmly for single-point before light source focus, it is impossible to asks in the metal plate matching gap for solving Laser Welding starting point Topic；

2. the curvature adaptive equalization function on side-wall outer-plate surface can not be solved, occur robot load excessive sometimes and report Alert the problems such as stopping line；

3. if gusset plate Y-direction deviation is larger, batch production scene can only stop line, reprogram to solve clamping problems, otherwise Robot will be stopped；

4. being accumulated without the output device of constant clamping force, such as welding slag, robot can alarm and stop in the process of running Only run, need to stop production and carry out manual cleaning；

5. both there is no output strength tunable arrangement, without visual force production device yet；

It is well known that matching clearance requirement of the quality of Laser Welding to metal plate is high, the fit clearance between steel plate should protect Hold between 0.1-0.3mm (0.2mm is optimal), serious spatter will be produced less than this scope, and be higher than this model Enclose, weld seam can be caused insecure, cause the off quality of laser welded seam.

At present can also be by the prior art using the clamping mode of conventional c folder.Enter laser room in vehicle vehicle body After dropping place, it is both needed to artificial C-type clamp for every sample car and clamps nearly 100 minutes of processing, time and effort consuming, this does not enter also including vehicle body Go out, vehicle body positioning, vehicle body 180 degree rotation, Laser Welding welding etc. other times.And practical laser welding process only needs 10 minutes left sides The right side can complete to process, and its speed is fast, the advantage of efficiency high is overshadowed because of traditional clamping mode.

How in " the pre- volume licensing vehicle " stage by the innovation to welding assembly tensioning technique come high quality and high efficiency Completion laser Welding be an extremely urgent job.

Utility model content

The purpose of this utility model is that solve the metal plate matching clearance issues of Laser Welding starting point and ensure light source focal point Weld gap, 2 points of the disposed at equal distance clamping before and after light source focus, while the hard sliding of clamping head is changed into the rolling of roller Dynamic displacement, both ensure to originate the requirement in commissure matching gap, become again and slide to roll to reduce the fretting wear of face of weld, So as to improve welding quality.

The utility model takes following technical scheme：

A kind of weld clamp device, including clamping unit, clamping arm unit, constant clamping force control unit 5, main pin 7；Institute Stating clamping arm unit includes the second transmission arm, the first transmission arm；The clamping unit is rotatablely connected by main pin 7, the second transmission Arm is fixedly connected with clamping unit near-end, and the first transmission arm is fixedly connected with the distal end of clamping unit；The constant clamping force control Unit 5 processed has body and expansion link, and expansion link end is rotatablely connected with the first transmission arm, and body and the second transmission arm are rotated and connected Connect；Positioned at the both sides of main pin 7, provided with limited block, the limited block is used to limit opening during clamping device undamped state Angle.

Further, the clamping arm unit 3 includes the second transmission arm switch block 3.2, the first transmission arm switch block 3.1, arm of force tune Save part 3.3；First transmission arm, the second transmission arm switch block 3.2,3.1 are be hinged by main pin 7；Set on arm of force regulating part 3.3 There is scale, each scale value corresponds with corresponding clamping force；It can be chosen by the length for adjusting the arm of force regulating part 3.3 The clamping force of adaptation.

Further, the arm of force regulating part 3.3 has adjusting nut and two-way left-hand thread screw structure.

Further, in addition to connection unit 4, the connection unit 4 respectively with constant clamping force control unit 5, folder Arm unit is fixedly connected.

Further, in addition to spatial attitude balancing unit 6, the spatial attitude balancing unit 6 have extension spring 6.4, The extension spring both ends are connected with the second transmission arm, the first transmission arm respectively, and extension spring keeps extended state.

Further, the constant clamping force control unit 5 includes cylinder and pressure-reducing valve.

Further, the clamping unit is to roll clamping unit 1, and the plane where workpiece to be clamped is XOY plane, with The vertical direction of the plane is Z-direction；The clamping unit 1 that rolls has at least two groups of rollers for being used for mutually clamping, roller rolling Dynamic linear velocity direction is along Y-direction.

Further, in addition to curvature compensation unit 2, curvature compensation unit 2 include swinging block 2.1, roll and clamp list Member 1 is fixed on swinging block 2.1, and the swinging center of swinging block 2.1 is along X to setting；Swinging block 2.1 is made by workpiece is clamped With can be along the small size swing of the swinging center adaptability.

A kind of method of work of weld clamp device,

Clamping process：Expansion link ejects, and drives the first transmission arm to be rotated around the first direction of main pin 7, and the first transmission arm supports Workpiece is firmly clamped, the first transmission arm stops；Expansion link continues to eject, under the positioning action of clamped workpiece, constant clamping The body of power control unit 5 drives the second transmission arm to be rotated to second direction, and the second transmission arm props up clamped workpiece；

Release process：Expansion link shrinks, and under the body of constant clamping force control unit 5 drives, the first transmission arm is along the Two directions rotate, until the first transmission arm props up limited block, the first transmission arm stops；Expansion link continues to shrink, and drives second to pass Swing arm rotates along a first direction around main pin 7, stops until expansion link shrinks, and the second transmission arm stops；Wherein, first direction It is two opposite directions with second direction.

The beneficial effects of the utility model are：

1) clamping process and release process of constant clamping force control unit, the action process of the top and the bottom of clamping unit All it is divided into two steps, relies on when completing second step action and positioned by blessing workpiece and limited block respectively, it is ingenious in design, clamp The degree of accuracy of position is high；

2) arm of force regulating part is set in clamping arm unit, it is convenient to carry out arm of force regulation, pass through arm of force regulation directly acquisition pair The clamping force answered；

3) spatial attitude adjustment unit provides pretension to upper, the first transmission arm, and effective anti-locking apparatus turns clockwise；

4) the final execution unit that clamping unit is clamping device is rolled, acts directly on and clamping action is completed on workpiece, Clamping effect is preferable, flexible stronger；

5) swinging block of curvature compensation unit is different with the circular arc face curvature for swinging limited block, and the former need to be less than the latter, and two Person is linked together by pin.When face of weld Curvature varying, inside and outside front and rear rolling wheel is with the constraint of mechanical pendulous device Slight oscillatory is produced, realizes that the adaptive two point of the curvature before and after light source focus clamps, so that surface irregularity is to be welded Connect workpiece and be in clamped condition all the time, clamping effect is good, strong adaptability.

6) be particularly suitable for use in the weld clamp process of automobile side coaming.

7) clamping and opening of two clamping parts of the output shaft of a driving part while control are utilized so that clamp knot Structure is simple so that whole clamping device convenient and reliable operation.

Brief description of the drawings

Fig. 1 is to make car schematic flow sheet.

Fig. 2 is the rolling fastening figure that the utility model welding rolls clamping device.

Fig. 3 is in the embodiment of the utility model one, and welding is clamped state with clamping device is rolled to automobile side coaming Schematic diagram.

Fig. 4 is the welding schematic perspective view for rolling clamping device in the embodiment of the utility model one.

Fig. 5 is the structure decomposition figure that clamping unit is rolled in the embodiment of the utility model one.

Fig. 6 is the installation diagram that clamping unit is rolled in Fig. 5.

Fig. 7 is the structure decomposition figure of curvature compensation unit in the embodiment of the utility model one.

Fig. 8 is the schematic top plan view of curvature compensation unit in the embodiment of the utility model one.

Fig. 9 is the pie graph of clamping arm unit in the embodiment of the utility model one.

Figure 10 is the welding front view for rolling clamping device in the embodiment of the utility model one.

Figure 11 is the schematic diagram of clamping arm unit visualization clamping force output in the embodiment of the utility model one.

Figure 12 is the structure decomposition figure of connection unit in the embodiment of the utility model one.

Figure 13 is the scheme of installation of limited block position in the embodiment of the utility model one.

Figure 14 is the pie graph of spatial attitude balancing unit in the embodiment of the utility model one.

Figure 15 is cylinder schematic diagram.

Figure 16 is the welding schematic diagram for rolling clamping device open mode in the embodiment of the utility model one.

Figure 17 is the welding schematic diagram for rolling gripping means grips state in the embodiment of the utility model one.

Figure 18 is the adaptive fundamental diagram of welding plane.

Figure 19 is used for the pressure-reducing valve of constant clamping force control.

In figure, 1. rolling clamping units, 2. curvature compensation units, 3. clamping forces regulation display unit, 4. connection units, 5. Constant clamping force control unit, 6. spatial attitude balancing units, 7. main pins, 1.1. wheel shafts, 1.2. copper packings, 1.3. rollers, 1.4. copper sheathing, 1.5 clamps, 1.6. hexagon socket head cap screws, 2.1 swinging blocks, 2.2. pins, 2.3. swing limited block, and 3.1. underarms turn Block, 3.2. upper arm switch blocks, 3.3. arm of force regulating parts, 3.4. knuckle joint contiguous blocks, 3.5. hinge ear contiguous blocks, 4.1. fixed blocks, 4.2. center contiguous block, 4.3. spring fastenings, 4.4 limited blocks, 6.1. extension spring contiguous blocks, 6.2. extension spring screw rods, 6.3. extension springs Contiguous block, 6.4. upper arm extension springs, 6.5. underarm extension springs, 6.6. extension spring screw rods.

Embodiment

The utility model is further illustrated with specific embodiment below in conjunction with the accompanying drawings.

With reference to laser fusion welding station actual conditions, the mounting hole that designed fixture refers to region by former pressure is integrated in microscope group On, its working condition is as shown in Figure 3.The general structure of doorframe laser fusion welding clamping device as shown in figure 4, Fig. 4 an implementation In example, doorframe laser fusion welding clamping device adjusts display unit 3, perseverance by rolling clamping unit 1, curvature compensation unit 2, clamping force Clamp clamp force control unit 5, spatial attitude balancing unit 6 and connection unit 4 form.Wherein, clamping unit 1 is rolled, curvature is mended It is that axis is rotated that unit 2 and clamping force regulation display unit 3, which are repaid, with main pin 7 (Fig. 4), and it is in axle pair to roll clamping unit 1 Claim it is each distribution one group, to being clamped inside and outside the gusset plate of doorframe, with ensure Laser Welding welding when to the matching between gusset inner and outer plates Gap is not more than 0.2mm requirement.Two groups of rollings are controlled to clamp by one group of constant clamping force control unit 5 of clamping device The pinching action of unit 1, clamping force regulation display unit 5 can not only adjust the size of clamping force, and can be to clamping force Visual output is carried out, the ideal position of the stable equilibrium's package unit of spatial attitude balancing unit 6, curvature compensation unit 2 is in fact In present welding process, the part of the surface generation Curvature varying to soldering part effectively compensates for.Pass through connection unit 4 On two pins two follow closely (Fig. 4 is not marked), package unit is integrated in Laser Welding microscope group, its random device people is synchronized with the movement, it is real The function that Xian Liao robots accompany with folder.

The design of essential elements：

1) clamping unit is rolled：

Roll clamping unit 1 to be mainly made up of wheel shaft 1.1, copper packing 1.2, roller 1.3, copper sheathing 1.4 and clamp 1.5, be folder The final execution unit of tight device, acts directly on and clamping action is completed on workpiece, with reference to figure 5 and combine Fig. 6.Each roller Embedded copper sheathing 1.4 in 1.3 centre bore, while respectively it is furnished with a copper packing 1.2 before and after roller 1.3, wheel shaft 1.1 is sleeved on copper sheathing 1.4 and copper packing 1.2 endoporus in.To ensure roller 1.3 when rolling, wheel shaft 1.1 does not rotate with roller 1.3, in wheel shaft 1.1 have circumferentially opened up one section of deep-slotted chip breaker (Fig. 5 and Fig. 6 are not marked), and swinging block 2.1 is provided with clamp 1.5, by clamp 1.5 arch section is stuck in matching deep-slotted chip breaker, then is fixed with hexagon socket head cap screw 1.6 by the mounting hole of clamp 1.5 The clamp 1.5, not only realizes the connection with wheel shaft 1.1, while also prevent wheel shaft 1.1 and the synchronous axial system of roller 1.3.

2) curvature compensation unit

As shown in fig. 7, curvature compensation unit 2 constitutes mechanical pendulum by swinging block 2.1, swing limited block 2.3 and pin 2.2 Dynamic device.Swinging block 2.1 is different with the circular arc face curvature for swinging limited block 2.3, and the circular arc face curvature of swinging block 2.1, which is less than, to be swung Both are connected to by the circular arc face curvature of limited block 2.3, pin 2.2 by the coaxial aperture of swinging block 2.1 and swing limited block 2.3 Together.Swing limited block 2.3 to be fixed on the transmission mechanism of outside by two pins one nail on its top, obtain power.Work as welding During surface curvature change, the roller of gusset inner and outer plates both sides can produce slight oscillatory with the constraint of mechanical pendulous device, real The adaptive two point of curvature before and after existing light source focus clamps, so that gusset inner and outer plates are in clamped condition, such as Fig. 8 all the time It is shown.

3) arm of force unit

Arm of force unit is divided into the first transmission arm and the second transmission arm, with reference to figure 9 and combines Figure 10, the first transmission arm is (in Fig. 9 Signal in be a underdrive arm) be mainly made up of switch block 3.1, arm of force regulating part 3.3 and knuckle joint contiguous block 3.4, Two transmission arms (being transmission arm on one in Fig. 9 signal) are mainly connected by switch block 3.2, arm of force regulating part 3.3 and cylinder hinge ear Block 3.5 is connect to form；First transmission arm and the second transmission arm constitute the gear unit of clamping device.All motion lists in device Member is concentrated on this unit, passes through the two pins one nail connection curvature compensation list on the switch block of the first transmission arm and the second transmission arm Member and two point rolling unit；The output shaft rotation of knuckle joint contiguous block 3.4 and hinge ear contiguous block 3.5 respectively with executive component connects Connect, executive component in the present embodiment is cylinder.

Wherein, ear contiguous block is cut with scissors close to the cylinder of the second transmission arm of one end of cylinder body connection in the output shaft of cylinder 3.5；The knuckle joint contiguous block 3.4 of the first transmission arm is connected in the one end of output shaft away from cylinder body of cylinder.

Power arm clamping process, the output shaft of cylinder outwards export, and under the driving of its output shaft, the first transmission arm is towards figure Rotating forward shown in 10, when the roller 1 of the first transmission arm is arrived on the fulcrum on the downside of a gusset inner and outer plates, now the first transmission Arm stops operating, but the output shaft of cylinder continues to output, and at this moment whole cylinder can be using the fulcrum on the downside of door gusset inner and outer plates in The heart, whole cylinder is towards rotating backward, and also synchronous backward rotates the second transmission arm, when the roller of the second transmission arm arrives to a gusset During fulcrum on the upside of inner and outer plates, the output shaft of cylinder stops output, and the roller of the first transmission arm and the second transmission arm roller will press from both sides The both sides of tight door gusset inner and outer plates, then manipulator laser welder start to weld.

Screwed hole 3.6 is provided with knuckle joint contiguous block 3.4, is connected with the screw rod 6.6 of spatial attitude balancing unit, Itself it is provided with and passes through main pin 3.7, king-pin 3.7 is fixed on connection unit, and knuckle joint contiguous block 3.4 is provided with by it Mounting hole 3.8 be flexibly connected with the one end of cylinder output shaft away from cylinder body.

Power arm puts opening process, the output of cylinder axially feed back into, under the driving of its output shaft, the first transmission arm court And rotate backward direction opening shown in Figure 10, when the first transmission arm arrives to limited block 4.4, the first transmission arm stops operating, Its opening angle determines, it can be fulcrum with limited block 4.4 towards just that now the output shaft of cylinder, which continues to feeding back into, whole cylinder, To rotation, also synchronous forward rotates the second transmission arm, when the output of cylinder is axially fed back into stop position, its second transmission The opening angle of arm also stops, and then manipulator laser welder returns to home position.

With continued reference to Fig. 9 and Figure 11 is combined, arm of force unit there can also be the function of clamping force regulation display.Arm of force unit A leverage can be similar to, one end connection cylinder, other end connection clamping unit, centre there can be an arm of force regulating part 3.9, it is respectively provided with left-right rotary threaded rod at the both ends of arm of force regulating part 3.9.For example, in the first cursor switch block 3.1 and Respectively there is one section of left hand thread bar at the position that two cursor switch blocks 3.2 are connected with arm of force regulating part 3.9, in the He of cylinder contiguous block 3.5 Respectively there are one section of dextrorotation external thread rod, tap bolt point in the position being connected with knuckle joint contiguous block 3.4 with arm of force regulating part 3.8 Xuan Ru not be corresponding to arm of force regulating part 3.9 in screwed hole.In the present embodiment, arm of force regulating part 3.9 can be extension sleeve, lead to Cross and turn extension sleeve, sleeve both ends stretch out simultaneously or retraction equal length, to be adjusted in synchronism the length of power arm, according to thick stick Stick force equilibrium principle, and then the output clamping force of transmission arm can be changed., can for the size of clamping force is more intuitively well understood To mill out a facet on the threaded rod of switch block 3.1 or/and switch block 3.2, the finger of clamping force size is carved with this plane Show, as shown in figure 11, its numerical values recited is calculated according to the length of selected cylinder model or the arm of force.It again it will be understood that , can also be on the threaded rod being connected in cylinder contiguous block 3.5 and knuckle joint contiguous block 3.4 with arm of force regulating part 3.9 A facet is milled out, is carved with the instruction of clamping force size on this plane, is simply adjusted by these and display device, it is existing Field can accurately show required clamping force, in order to the effective analysis and regulation in process control, improve welding quality.

4) connection unit：

Referring to Figure 12 and Figure 13 is combined, connection unit is mainly by fixed block 4.1, center contiguous block 4.2, spring fastenings 4.3 and main pin 4.5 form.To ensure the relative positional accuracy after each unit assembling, the connection in this unit is using four nails The mode of two pins (Figure 12 is not marked), it is achieved thereby that the present apparatus is internally between each unit and externally between welding microscope group Be reliably connected.

For connection unit and the connection for rolling clamping unit, adjust display unit for limitation clamping force and rotated around main pin Opening angle, can be in corresponding first power arm of recess region of center contiguous block 4.2 or/and a certain of the second power arm The position of angle of release degree, provided with limited block 4.4, in the present embodiment, limited block can be the limited block of a similar bolt, specifically Position is as shown in figure 13.By limited block threaded engagement number leave come adjustment bolt the length of center contiguous block 4.2, so as to The opening angle of power arm when can control clamping device undamped state with Indirect method.

5) spatial attitude balancing unit：

Referring to Figure 14, spatial attitude balancing unit mainly by extension spring contiguous block 6.3, extension spring screw rod 6.2, extension spring screw rod 6.6, Second extension spring 6.4 and the first extension spring 6.5 form.There can be two extension springs in this unit, balance two differences suitable, counterclockwise respectively The strength in direction.The first end of first extension spring is connected in cylinder output end, and its second end and connection unit are fixed.Cylinder stretch out, During product to be welded is clamped, a whole set of clamping device may (towards one side of cylinder) to the rear because of center of gravity and along the main pin inverse time Pin rotates to an angle, under the elastic force effect of the first extension spring so that device balance and stability is in workpiece surface, not because of weight imbalance And change angle.The elastic force of extension spring can be adjusted by extension spring screw rod 6.2 or/and extension spring screw rod 6.2, on the one hand How much its intensity can be adjusted with the threaded engagement of contiguous block by extension spring screw rod, on the other hand also can be by changing different length Extension spring adjustment elastic force.The action principle of second extension spring is identical, is mainly used in anti-locking apparatus and turns clockwise.Due to second Power arm and the limitation in cylinder junction space, spy add an extension spring connection on the hinge ear contiguous block 3.5 of the second power arm Block 6.3 is used to connect extension spring.

Welding plane adaptation function can mainly be provided by clamping cylinder, as shown in figure 15.According to the demand of clamping force, The free space size admission pressure different with live selection and cylinder model, in the present embodiment can be from stroke 75mm's SMC clamping cylinders.

The output shaft of cylinder 7 is connected by cutting with scissors ear end with the contiguous block of clamping force regulation display unit, such as Figure 16,17 institutes Show, cylinder 7 provides power source for a whole set of clamping device.Its operation principle is as follows：From the air inlet of inlet end 7.1, outlet side 7.2 goes out Gas, piston rod stretch out, and the first power arm first acts, until interior of body roller contacts with side-wall inner-plate, now piston rod continues Stretch out, the action of the second power arm, until body exterior roller contacts with side-wall outer-plate, so as to complete to clamp.Now, cylinder is not Whole strokes are covered, it is necessary to reserved part stroke, are reserved 10mm strokes in the present embodiment, for the holding to clamping force and Welding plane Y-direction deviation it is adaptive, as shown in figure 18.Gusset plate ideal position is the " position of position 2 ", if but having partially in figure Difference, then may be in " position 1 " or " position of position 3 "." position 1 " and " fluctuated no matter how size fluctuates between position 3 ", root The reserved stroke set according to cylinder, interior roller is first and after side-wall inner-plate contact, because piston rod continues to stretch out, drives upper arm to move Make until exterior roller contacts with side-wall outer-plate, the both sides of welding plane can be all clamped, and reach the adaptive work(of welding plane It can require.

Figure 19 is the pressure-reducing valve for constant clamping force control, in the present embodiment can be by pressure-reducing valve in cylinder gas circuit In use, the air pressure progress automatic pressure-reducing higher than preset range provided outside, keep the accuracy of clamping force.

Above is preferred embodiment of the present utility model, those of ordinary skill in the art can also be carried out respectively on this basis Kind conversion improves, and on the premise of the total design of the utility model is not departed from, these conversion or improvement should all belong to this reality Within the scope of new be claimed.

Claims (8)

1. A kind of 1. weld clamp device, it is characterised in that：

   Including clamping unit, clamping arm unit, constant clamping force control unit (5), main pin (7)；

   The clamping arm unit includes the second transmission arm, the first transmission arm；

   The clamping unit is rotatablely connected by main pin (7), and the second transmission arm is fixedly connected with clamping unit near-end, and first passes Swing arm is fixedly connected with the distal end of clamping unit；The constant clamping force control unit (5) has body and expansion link, expansion link End is rotatablely connected with the first transmission arm, and body and the second transmission arm are rotatablely connected；

   Positioned at the both sides of main pin (7), provided with limited block, the limited block is used to limit during clamping device undamped state Angle of release degree.
2. 2. weld clamp device as claimed in claim 1, it is characterised in that：The clamping arm unit (3) includes the second transmission arm Switch block (3.2), the first transmission arm switch block (3.1), arm of force regulating part (3.3)；First transmission arm, the second transmission arm switch block (3.1,3.2) are be hinged by main pin (7)；Arm of force regulating part (3.3) is provided with scale, each scale value and corresponding clamping force one One correspondence；Length by adjusting the arm of force regulating part (3.3) can choose the clamping force of adaptation.
3. 3. weld clamp device as claimed in claim 2, it is characterised in that：The arm of force regulating part (3.3) has regulation spiral shell Female and two-way left-hand thread screw structure.
4. 4. weld clamp device as claimed in claim 3, it is characterised in that：Also include connection unit (4), the connection unit (4) it is fixedly connected respectively with constant clamping force control unit (5), clamping arm unit.
5. 5. weld clamp device as claimed in claim 4, it is characterised in that：Also include spatial attitude balancing unit (6), it is described Spatial attitude balancing unit (6) has extension spring (6.4), and the extension spring both ends are connected with the second transmission arm, the first transmission arm respectively, Extension spring keeps extended state.
6. 6. weld clamp device as claimed in claim 1, it is characterised in that：The constant clamping force control unit (5) includes Cylinder and pressure-reducing valve.
7. 7. weld clamp device as claimed in claim 1, it is characterised in that：The clamping unit is to roll clamping unit (1), Plane where workpiece to be clamped is XOY plane, and the direction vertical with the plane is Z-direction；The rolling clamping unit (1) has For at least two groups of rollers mutually clamped, linear velocity direction that roller rolls is along Y-direction.
8. 8. weld clamp device as claimed in claim 7, it is characterised in that：Also include curvature compensation unit (2), curvature compensation Unit (2) includes swinging block (2.1), rolls clamping unit (1) and is fixed on swinging block (2.1), the swinging axle of swinging block (2.1) The heart is along X to setting；Swinging block (2.1) is acted on by workpiece is clamped, can be along the small size swing of the swinging center adaptability.