CN217702060U - Welding fixture for automobile machining with accurate positioning - Google Patents

Abstract

The utility model relates to a fix a position accurate welding jig for automobile processing, it is inseparable that part welding point department accessory laminating when having solved the auto-parts welding to lead to the relatively poor technical problem of positioning accuracy. The welding fixture for automobile machining comprises a base, two vertical plates, two clamping devices, a sliding mechanism, a lifting mechanism and a locking device. Two risers are installed in the relative both sides of base respectively, and the one end that the base was kept away from to two risers upwards extends. And the two clamping devices are respectively arranged at the tops of the two vertical plates and are used for clamping and fixing the automobile parts. And the sliding mechanism is arranged on the base and is positioned between the two vertical plates. And the bottom of the lifting mechanism is slidably mounted on the sliding mechanism so that the lifting mechanism slides relative to the base. And the locking device is arranged at the top of the lifting mechanism and used for locking and fixing the automobile parts, and the lifting mechanism is used for driving the locking device to lift.

Description

Welding fixture with accurate positioning for automobile machining

Technical Field

The utility model belongs to the technical field of the automobile manufacturing processing, in particular to fix a position accurate welding jig for automobile processing.

Background

At present, in the known welding of the automobile parts, most of welding fixtures used use a clamping device fixed on a bottom plate to clamp and position the automobile parts. Thereby can be equipped with great clearance between two fixed clamping device in actual production process and make things convenient for welder and soldering turret to weld the welding point that is in between the clearance, this has also leaded to some to need apply the welding department and has crossed far away from clamping device for laminating is inseparable enough between auto-parts, thereby makes auto-parts positioning accuracy relatively poor when the welding.

SUMMERY OF THE UTILITY MODEL

The utility model provides a fix a position accurate welding jig for automobile processing for part welding point department accessory laminating is inseparable when solving the auto-parts welding, thereby leads to the relatively poor technical problem of positioning accuracy.

In order to achieve the above purpose, the utility model discloses a following technical scheme realizes: the utility model provides a fix a position accurate welding jig for automobile machining includes base, two risers, two clamping device, slide mechanism, elevating system and locking device, and two risers are installed to relative both sides on the base, and the one end that the base was kept away from to two risers extends upwards, and two clamping device are installed in the relative both sides of base through two risers for press from both sides tightly fixed auto-parts; the sliding mechanism is arranged on the base and is positioned between the two vertical plates; the bottom of the lifting mechanism is slidably mounted on the sliding mechanism so that the lifting mechanism can slide relative to the base, and the locking device is mounted at the top of the lifting mechanism so that the locking device can slide and lift relative to the base.

Through the structure, the utility model provides a pair of fix a position accurate for the automobile processing welding jig make when welding, the laminating is inseparabler between solder joint department auto-parts, and then makes the anchor clamps location more accurate. Specifically, after the auto-parts are fixed through two clamping devices, the sliding mechanism drives the locking device to slide to a position needing to be welded, the lifting mechanism drives the locking device to rise to a height capable of clamping the auto-parts, then the locking device clamps the auto-parts tightly, so that the auto-parts needing to be welded are tightly attached to each other, after welding is completed, the locking device loosens the auto-parts, the lifting mechanism drives the locking device to fall down, the sliding mechanism drives the locking device to slide to a position near the position needing to be welded, welding of the auto-parts is repeatedly completed, and the welding position where the locking device is clamped is arranged at each welding so that the auto-parts are tightly attached to each other, so that the welding positioning precision of the auto-parts is improved, therefore, the welding clamp for automobile machining enables the auto-parts to be positioned more accurately during welding, the structure is more reasonable, and the practicability is higher.

Optionally, the clamping device comprises:

the fixed end of the first air cylinder is hinged to the side wall of the vertical plate;

the first hinge seat is fixed in the middle of the vertical plate;

one end of the first clamping arm is hinged with the telescopic end of the first air cylinder, and the middle part of the first clamping arm is hinged to the vertical plate through the first hinge seat;

the first positioning block is clamped at the other end of the first clamping arm;

the second positioning block is clamped on the vertical plate and is arranged opposite to the first positioning block, and the first positioning block and the second positioning block are used for clamping automobile accessories;

and one end of the positioning pin is arranged on the vertical plate, and the other end of the positioning pin is far away from the vertical plate and extends upwards. .

Optionally, the sliding bottom plate is detachably mounted on the base, and the sliding bottom plate is located between the two vertical plates;

the two side plates are respectively arranged on two opposite sides of the sliding bottom plate, and one ends of the two side plates, which are far away from the sliding bottom plate, extend upwards;

one end of the screw rod is rotatably installed on any one side plate, and the other end of the screw rod is rotatably installed on the other side plate;

the two ends of the two guide rails are respectively arranged on the two side plates, the axes of the guide rails are parallel to the axis of the screw rod, and the screw rod is positioned between the two guide rails;

the sliding block is provided with a screw rod hole and two guide rail holes, the screw rod is in threaded connection with the screw rod hole, the two guide rails respectively penetrate through the two guide rail holes, and when the screw rod is rotated, the sliding block slides on the screw rod and the two guide rails;

the handle is installed at one end of the screw rod, and the handle drives the screw rod to rotate when rotating.

Optionally, the lifting mechanism comprises a double-rod cylinder, the fixed end of the double-rod cylinder is detachably mounted on the sliding block, and the locking device is detachably mounted at the telescopic end of the double-rod cylinder

Optionally, the base is provided with a screw hole, the sliding bottom plate is provided with a mounting hole, and the bolt penetrates through the mounting hole and is bolted in the screw hole to connect the sliding bottom plate and the base.

Optionally, the number of the bolts is eight, and the sliding bottom plate is bolted to the base through eight bolts.

Optionally, the locking device comprises:

the second hinge seat is fixed at the telescopic end of the double-rod cylinder;

the fixed end of the second air cylinder is hinged to the side wall of the second hinge seat;

one end of the second clamping arm is hinged with the telescopic end of the second cylinder, and the middle part of the second clamping arm is hinged on the second hinge seat;

the third positioning block is clamped at the other end of the second clamping arm;

the fourth positioning block is connected to the second hinge seat in a clamped mode and is arranged opposite to the third positioning block, and the third positioning block and the fourth positioning block are used for clamping automobile accessories.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is a schematic structural view of the welding clamp for automobile machining provided by the embodiment of the present invention when clamping arms are accurately positioned;

fig. 2 is a schematic structural view of the welding clamp for automobile machining provided by the embodiment of the present invention when the clamping arms are opened;

FIG. 3 is a schematic structural view of an automobile accessory;

FIG. 4 is an exploded view of an automobile accessory;

fig. 5 is a schematic structural view of the welding jig for automobile machining, which is provided by the embodiment of the present invention and has accurate positioning after the automobile parts are fixed;

fig. 6 is a schematic structural diagram of a clamping device of the welding fixture for automobile machining, which is provided by the embodiment of the invention and has accurate positioning;

fig. 7 is a schematic structural diagram of a sliding mechanism of the welding jig for automobile machining, which is provided by the embodiment of the present invention and has accurate positioning;

fig. 8 is a schematic structural diagram of a locking device of a welding jig for automobile machining, which is provided by the embodiment of the present invention.

In the figure:

1-a base;

2-standing the plate;

3-a clamping device; 31-a first cylinder; 32-a first articulated seat; 33-a first clamp arm; 34-a first positioning block; 35-a second positioning block; 36-a locating pin;

4-a sliding mechanism; 41-a sliding bottom plate; 42-a screw rod; 43-a guide rail; 44-a slider; 45-a handle; 46-side plate;

5-a double-rod cylinder;

6-locking device; 61-a second articulated seat; 62-a second cylinder; 63-a second clamp arm; 64-a third positioning block; 65-a fourth locating block;

7-bolt;

8-automotive B-pillar; 81-B column outer plates; 82-B pillar inner panel.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be described in detail below. It is to be understood that the embodiments described are only some embodiments of the invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

Examples

At present, in the known welding of automobile parts, most of welding fixtures are used for clamping and positioning the automobile parts by using a clamping device 3 fixed on a bottom plate. In the actual production process, a large gap is formed between the two fixed clamping devices 3, so that a welding gun and a welding tongs can conveniently weld the welding point between the gaps, the welding part needs to be applied too far away from the clamping devices 3, the fitting between the automobile parts is not tight enough, and the positioning precision of the automobile parts is poor during welding.

In order to solve the technical problem, the embodiment provides a welding jig for automobile machining with accurate positioning, which is used for improving the technical problem of poor positioning accuracy in the welding of automobile parts. As shown in fig. 5, the welding jig for automobile processing includes a base 1, a vertical plate 2, a sliding mechanism 4, a lifting mechanism, a clamping device 3, and a locking device 6.

The automobile parts shown in fig. 3 include an automobile B-pillar 8, the automobile B-pillar 8 is a pillar between front and rear doors of an automobile, the automobile B-pillar 8 shown in fig. 4 includes a B-pillar outer panel 81 and a B-pillar inner panel 82, and the automobile B-pillar 8 shown in fig. 3 is an automobile part formed by stacking and welding the B-pillar outer panel 81 and the B-pillar inner panel 82.

Base 1 adopts high strength alloy steel to make, and two risers 2 are installed to the relative both sides on the base 1, and the one end that base 1 was kept away from to two risers 2 upwards extends, and two clamping device 3 are installed in base 1's relative both sides through two risers 2 for press from both sides tight fixed car B post 8, prevent that car B post 8 from overturning and the translation on the welding plane, improved the precision of car B post 8 location. The sliding mechanism 4 is installed on the base 1 and located between the two vertical plates 2. The bottom of the lifting mechanism is slidably mounted on the sliding mechanism 4, so that the lifting mechanism can slide relative to the base 1, and the locking device 6 is mounted at the top of the lifting mechanism, so that the locking device 6 can slide and lift relative to the base 1, and the locking device 6 can move downwards before horizontal movement to avoid the surface of the automobile B column 8, and further the surface of the automobile B column cannot be scratched.

Through the structure, the welding fixture for the automobile processing with accurate positioning provided by the embodiment has the advantages that when welding is carried out, the B column outer plate 81 and the B column inner plate 82 at the welding point are attached more tightly, and the fixture is positioned more accurately. Specifically, after the B-pillar outer plate 81 and the B-pillar inner plate 82 are fixed by the two clamping devices 3, the lifting mechanism drives the locking device 6 to descend, the sliding mechanism 4 drives the locking device 6 to slide to a position to be welded, the lifting mechanism drives the locking device 6 to ascend to a height capable of clamping the B-pillar outer plate 81 and the B-pillar inner plate 82, then the locking device 6 clamps the B-pillar outer plate 81 and the B-pillar inner plate 82 tightly, the B-pillar outer plate 81 and the B-pillar inner plate 82 to be welded are tightly attached, after welding is completed, the locking device 6 loosens the B-pillar outer plate 81 and the B-pillar inner plate 82, the lifting mechanism drives the locking device 6 to descend, the sliding mechanism 4 drives the locking device 6 to slide to a position near the position to be welded next, and accordingly welding of automobile accessories is completed in a reciprocating mode. Because when welding at every turn, the welding department all possess locking device 6 and press from both sides tight location to B post planking 81 and B post inner panel 82 for B post planking 81 and B post inner panel 82 laminate closely, thereby promoted car B post 8's welding position precision, so, this welding jig for car processing makes auto-parts fix a position more accurately when the welding, and the structure is more reasonable, and the practicality is stronger.

An alternative implementation of this embodiment is as follows: the clamping device 3 shown with reference to fig. 6 comprises: first cylinder 31, first articulated seat 32, first arm lock 33, first locating piece 34, second locating piece 35 and locating pin 36, first cylinder 31's stiff end articulates on the lateral wall of riser 2, first cylinder 31's flexible end is articulated with the one end of first arm lock 33, the middle part of first arm lock 33 articulates on riser 2 through first articulated seat 32, the other end joint of first arm lock 33 has first locating piece 34. The second positioning block 35 is clamped on the vertical plate 2, the second positioning block 35 is arranged opposite to the first positioning block 34, and the first positioning block 34 and the second positioning block 35 are used for clamping the B-pillar inner plate 82 and the B-pillar outer plate 81. One end of the positioning pin 36 is mounted on the vertical plate 2, and the other end thereof is far away from the vertical plate 2 and extends upwards. Specifically, when the B-pillar inner plate 82 and the B-pillar outer plate 81 are installed, a piston rod in the first cylinder 31 is in a contracted state, so that one end of the first clamping arm 33 is pulled, the other end of the first clamping arm 33 is far away from the vertical plate 2, the first positioning block 34 is driven to be far away from the second positioning block 35, a larger installation space is vacated, the B-pillar inner plate 82 and the B-pillar outer plate 81 are positioned by the positioning pin 36, the second positioning block 35 is attached to the lower end face of the B-pillar outer plate 81, after the B-pillar inner plate 82 and the B-pillar outer plate 81 are positioned, the piston rod in the first cylinder 31 extends out, one end of the first clamping arm 33 is pushed to press the other end of the first clamping arm 33, so that the first positioning block 34 is driven to press down, the first positioning block 34 is matched with the second positioning block 35 to press the B-pillar inner plate 82 and the B-pillar outer plate 81 tightly, so that the B-pillar inner plate and the B-pillar outer plate cannot generate relative displacement during welding; after the welding is completed, the piston rod in the first cylinder 31 contracts, so that one end of the first clamping arm 33 is pulled, the other end of the first clamping arm 33 is far away from the vertical plate 2, the first positioning block 34 is driven to be far away from the second positioning block 35, the positioning and press mounting of the automobile B column 8 are released, and a larger separation space is vacated, so that the installation of the automobile B column 8 is facilitated, and the automobile B column 8 is further enabled to be separated from the welding clamp for automobile processing more easily.

An alternative implementation of this embodiment is as follows: the slide mechanism 4 shown with reference to fig. 7 includes: the base plate 41 is detachably mounted on the base 1, the base plate 41 is located between the two vertical plates 2 and is respectively mounted on two opposite sides of the base plate 41, one ends of the two side plates 46, which are far away from the base plate 41, extend upwards, one end of the screw rod 42 is rotatably mounted on any one side plate 46, the other end of the screw rod 42 is rotatably mounted on the other side plate 46 and is provided with the handle 45, the handle 45 drives the screw rod 42 to rotate when rotating, two ends of the two guide rails 43 are respectively mounted on the two side plates 46, the axes of the guide rails 43 are parallel to the axis of the screw rod 42, the screw rod 42 is located between the two guide rails 43, the slide block 44 is provided with a screw rod 42 hole and two guide rail 43 holes, the screw rod 42 is in threaded connection with the screw rod 42 hole, the two guide rails 43 respectively penetrate through the two guide rail 43 holes, and when the screw rod 42 is rotated, the slide block 44 slides on the screw rod 42 and the two guide rails 43. Specifically, when the locking device 6 needs to slide, the rotating handle 45 drives the screw rod 42 to rotate, so that the sliding block 44 slides on the screw rod 42, and the locking device 6 is driven to move on the base 1, the moving distance is in direct proportion to the number of rotating turns, and the sliding direction is determined by the rotating direction. Like this, can rotate the number of turns and the direction of handle 45 through control for locking device 6 accurately stops need press from both sides tight fixed position when the welding, and then makes this welding department B post inner panel 82 closely laminate with B post inner panel 82, has improved the positioning accuracy when auto-parts welds.

An alternative implementation of this embodiment is as follows: elevating system includes that flexible direction is the double-pole cylinder 5 of vertical direction, the shell demountable installation of double-pole cylinder 5 is on sliding block 44, locking device 6 bolt is at the flexible end of double-pole cylinder 5, specifically, sliding mechanism 4 drives locking mechanism before sliding, the piston rod shrink in the double-pole cylinder 5 makes locking device 6 and car B post 8 contactless point, thereby can not fish tail car B post 8 surface, sliding mechanism 4 drives locking mechanism after sliding, the piston rod in the double-pole cylinder 5 stretches out and sends locking device 6 to press from both sides tight required height and press from both sides tightly the auto-parts, like this, locking device 6 can not fish tail car B post 8 in sliding. Adopt two pole cylinders 5 for elevating system has good anti bending and antitorque commentaries on classics ability, makes elevating system can be better bear the external force of all directions when welding.

An alternative implementation of this embodiment is as follows: the screw has been seted up on base 1, the mounting hole has been seted up on sliding bottom plate 41, bolt 7 passes the mounting hole bolt joint in the screw, during locking, sliding bottom plate 41 is fixed on base 1, and like this, adopt the bolt 7 bolt joint to make the connection have stability and detachability, make sliding bottom plate 41 fix a position accurately at the during operation, the location precision of car B post 8 has been improved, also make sliding mechanism 4 can dismantle, thereby when sliding mechanism 4 damages, convenient maintenance and the change to sliding mechanism 4.

An alternative implementation of this embodiment is as follows: the number of the bolts 7 is eight, the sliding base plate 41 is bolted on the base 1 through the eight bolts 7, and the eight bolts 7 are uniformly distributed on two sides of the sliding base plate 41 parallel to the screw rod 42, so that the eight bolts 7 are adopted for bolting, the possibility that the bolts 7 fall off due to vibration is reduced, and the sliding mechanism 4 can work more stably.

An alternative implementation of this embodiment is as follows: the locking device 6 shown with reference to fig. 8 comprises: the second hinge base 61, the second cylinder 62, the second clamping arm 63, the third positioning block 64 and the fourth positioning block 65. The fixed end of the second cylinder 62 is hinged to the side wall of the second hinge seat 61, the telescopic end of the second cylinder 62 is hinged to one end of the second clamping arm 63, the middle part of the second clamping arm 63 is hinged to the telescopic end of the double-rod cylinder 5 through the second hinge seat 61, and the other end of the second clamping arm 63 is clamped with a third positioning block 64. The fourth positioning block 65 is clamped on the vertical plate 2, the fourth positioning block 65 is arranged opposite to the third positioning block 64, and the third positioning block 64 and the fourth positioning block 65 are used for clamping the B-column inner plate 82 and the B-column outer plate 81. Specifically, after the locking device 6 is moved to a position to be clamped by the sliding mechanism 4 and the lifting mechanism, the fourth positioning block 65 is attached to the lower end face of the B-column outer plate 81, the piston rod in the second cylinder 62 extends out, one end of the second clamping arm 63 is pushed to press the other end of the second clamping arm 63, so that the third positioning block 64 is driven to press the third positioning block 64, the third positioning block 64 is matched with the fourth positioning block 65 to press the B-column inner plate 82 and the B-column outer plate 81 tightly, so that the B-column inner plate 82 and the B-column outer plate 81 are tightly attached during welding, the positioning accuracy during welding of the automobile parts is improved, the welding is completed, the piston rod in the second cylinder 62 is contracted, so that one end of the second clamping arm 63 is pulled, the other end of the second clamping arm 63 is far away from the second hinged seat 61, so that the third positioning block 64 is driven to be far away from the fourth positioning block 65, and the positioning and press-fitting of the automobile parts are finished.

In summary, in the using process, as shown in fig. 2, the piston rod in the first cylinder 31 is firstly retracted, so as to pull one end of the first clamping arm 33, and make the other end of the first clamping arm 33 be away from the vertical plate 2, thereby driving the first positioning block 34 to be away from the second positioning block 35. Meanwhile, the piston rod in the second cylinder 62 contracts to pull one end of the second clamping arm 63, so that the other end of the second clamping arm 63 is far away from the second hinge seat 61, so as to drive the third positioning block 64 to be far away from the fourth positioning block 65, then the B-pillar outer plate 81 and the B-pillar inner plate 82 are placed on the clamp and positioned by the positioning pin 36, the surface of the B-pillar outer plate 81 is attached to the second positioning block 35 and the fourth positioning block 65, then the piston rod in the first cylinder 31 extends out, one end of the first clamping arm 33 is pushed, so that the other end of the first clamping arm 33 is pressed down to drive the first positioning block 34 to be pressed down, and the first positioning block 34 is matched with the second positioning block 35 to press and fix the B-pillar inner plate 82 and the B-pillar outer plate 81. Then, the piston rod in the double-rod cylinder 5 contracts to drive the second hinge seat 61, the second cylinder 62, the second clamping arm 63, the third positioning block 64 and the fourth positioning block 65 to descend; the handle 45 is rotated to drive the screw rod 42 to rotate, so that the sliding block 44 slides on the screw rod 42, and the second hinge seat 61, the second cylinder 62, the second clamping arm 63, the third positioning block 64 and the fourth positioning block 65 are driven to slide to a position to be welded; a piston rod in the double-rod cylinder 5 extends out to drive the second hinge seat 61, the second cylinder 62, the second clamping arm 63, the third positioning block 64 and the fourth positioning block 65 to ascend to the height of the fourth positioning block 65 attached to the surface of the B-column outer plate 81; a piston rod in the second cylinder 62 extends out, and one end of the second clamping arm 63 is pushed to enable the other end of the second clamping arm 63 to be pressed downwards, so that the third positioning block 64 is driven to be pressed downwards, and the third positioning block 64 and the fourth positioning block 65 are matched to tightly press the B-column inner plate 82 and the B-column outer plate 81; after the spot welding is completed, the piston rod in the second cylinder 62 is contracted to pull one end of the second clamping arm 63, so that the other end of the second clamping arm 63 is far away from the second hinge seat 61, and the third positioning block 64 is driven to be far away from the fourth positioning block 65, thereby finishing the positioning and press-fitting of the automobile accessory. And repeating the previous step until all welding is completed, and finally, retracting the piston rod in the first cylinder 31 to pull one end of the first clamping arm 33, so that the other end of the first clamping arm 33 is far away from the vertical plate 2, and further, driving the first positioning block 34 to be far away from the second positioning block 35 to take out the automobile B-pillar 8. After finishing all the operations, as shown in fig. 1, the piston rod in the first cylinder 31 extends out, and one end of the first clamping arm 33 is pushed so that the other end of the first clamping arm 33 is pressed down, thereby driving the first positioning block 34 to be pressed down. Meanwhile, the piston rod in the second cylinder 62 extends out, and one end of the second clamping arm 63 is pushed so that the other end of the second clamping arm 63 is pressed down, thereby driving the third positioning block 64 to be pressed down.

The above description is only for the specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto, and any person skilled in the art can easily think of the changes or substitutions within the technical scope of the present invention, and all should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims (7)

1. The utility model provides a fix a position accurate welding jig for automobile machining which characterized in that includes:

a base;

the two vertical plates are respectively arranged on two opposite sides of the base, and one ends of the two vertical plates, which are far away from the base, extend upwards;

the two clamping devices are respectively arranged at the tops of the two vertical plates and are used for clamping and fixing automobile accessories;

the sliding mechanism is arranged on the base and is positioned between the two vertical plates;

the bottom of the lifting mechanism is slidably mounted on the sliding mechanism so that the lifting mechanism can slide relative to the base;

the locking device is arranged at the top of the lifting mechanism and used for locking and fixing automobile accessories, and the lifting mechanism is used for driving the locking device to lift.

2. The welding fixture for automobile machining with accurate positioning according to claim 1, characterized in that: the clamping device includes:

the fixed end of the first air cylinder is hinged to the side wall of the vertical plate;

the first hinge seat is fixed in the middle of the vertical plate;

one end of the first clamping arm is hinged with the telescopic end of the first air cylinder, and the middle part of the first clamping arm is hinged on the vertical plate through the first hinge seat;

the first positioning block is clamped at the other end of the first clamping arm;

the second positioning block is clamped on the vertical plate and is arranged opposite to the first positioning block, and the first positioning block and the second positioning block are used for clamping automobile accessories;

and one end of the positioning pin is arranged on the vertical plate, and the other end of the positioning pin is far away from the vertical plate and extends upwards.

3. The welding jig for automobile machining with accurate positioning as set forth in claim 1, wherein the sliding mechanism comprises:

the sliding bottom plate is detachably arranged on the base and is positioned between the two vertical plates;

the two side plates are respectively arranged on two opposite sides of the sliding bottom plate, and one ends of the two side plates, which are far away from the sliding bottom plate, extend upwards;

one end of the screw rod is rotatably installed on any one side plate, and the other end of the screw rod is rotatably installed on the other side plate;

two ends of the two guide rails are respectively installed on the two side plates, the axes of the guide rails are parallel to the axis of the screw rod, and the screw rod is positioned between the two guide rails;

the sliding block is provided with a screw rod hole and two guide rail holes, the screw rod is in threaded connection with the screw rod hole, the two guide rails respectively penetrate through the two guide rail holes, and when the screw rod is rotated, the sliding block slides on the screw rod and the two guide rails;

the handle is installed at one end of the screw rod, and the handle drives the screw rod to rotate when rotating.

4. The welding fixture for machining the automobile with accurate positioning in claim 3 is characterized in that: elevating system includes the double-pole cylinder, the stiff end demountable installation of double-pole cylinder is in on the sliding block, locking device demountable installation is in the flexible end of double-pole cylinder.

5. The welding jig with precise positioning for automobile processing as claimed in claim 3, wherein a screw hole is formed on the base, a mounting hole is formed on the sliding bottom plate, and a bolt is bolted in the screw hole through the mounting hole to connect the sliding bottom plate and the base.

6. The welding fixture for automobile machining with accurate positioning according to claim 5, characterized in that: the number of the bolts is eight, and the sliding bottom plate is bolted on the base through eight bolts.

7. The welding fixture for automobile machining with accurate positioning according to claim 4, characterized in that: the locking device includes:

the second hinge seat is fixed at the telescopic end of the double-rod cylinder;

the fixed end of the second air cylinder is hinged to the side wall of the second hinge seat;

one end of the second clamping arm is hinged with the telescopic end of the second cylinder, and the middle part of the second clamping arm is hinged on the second hinge seat;

the third positioning block is clamped at the other end of the second clamping arm;

the fourth positioning block is connected to the second hinge seat in a clamped mode, the fourth positioning block and the third positioning block are arranged oppositely, and the third positioning block and the fourth positioning block are used for clamping automobile accessories.

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