CN204373622U - A kind of pick-up unit of vehicle bodywork soldering cramping apparatus - Google Patents

Abstract

The utility model discloses a detection device for a welding jig of an automobile body, which comprises a bracket and a detection platform. The lower part of the cylinder body is a pressure chamber, the upper end of the piston rod of the left and right drive cylinders is provided with a pressure block, and a scale is provided on the side of the part where the piston rod protrudes from the cylinder body, and a cross pointer is fixed on the detection platform. The two ends of the double-headed pointer are respectively close to the scales on the left and right drive cylinders, the upper part of the bracket is horizontally provided with left and right detection cylinders, and the outer ends of the piston rods of the left and right detection cylinders are provided with reference measuring blocks, The inner side of the cylinder body of the left and right detection oil cylinders is an oil inlet chamber, and the pressure chambers of the left and right drive oil cylinders are respectively connected with the oil inlet chambers of the left and right detection oil cylinders through pipelines. The detection program of the utility model is simple and quick, and the manufacturing cost is low, and the maintenance is convenient, and the utility model is suitable for the on-line detection of the welding fixture of the automobile body.

Description

A detection device for an automobile body welding jig

technical field

The utility model relates to a detection device used in automobile manufacturing, in particular to a detection device for detecting the precision of a large-scale combined jig used in the welding of automobile bodies.

Background technique

In the automobile manufacturing process, various forms of jigs are required for the welding of parts, so that the parts to be welded can be positioned reliably. Among them, large-scale combined fixtures are required in the welding and manufacturing process of automobile body-in-white. In the welding and manufacturing process of automobile body-in-white, the main part of the automobile body is fixed on a base, which can be moved from one welding station to the next along the clamping line body, and the clamping line The left and right sides of the body are respectively equipped with combined fixtures to ensure that the left and right sides, floors, cabins and other large assemblies are combined with the main part of the body for welding. The combined fixtures usually include a reference plate as a reference, set on The positioning mechanism on the reference plate, etc., when working, the reference plates on both sides will move left and right along the slide rails and approach the fixture line body, so that the left and right side walls, floor, engine room and other large assemblies positioned on the reference plate can be aligned with the The body parts are joined together and welded together. Due to the large volume and heavy weight of the reference plate, on the one hand, the slide rail will be worn during repeated movement; As a result, the position deviation between the large assemblies such as the left and right sides, the floor, and the engine room and the main part of the vehicle body will reduce the welding accuracy of the entire vehicle body, thereby affecting the quality of the vehicle. For this reason, we need to detect the position of the reference plate to ensure that its positioning is accurate. In the prior art, it is usually detected with a three-coordinate measuring instrument, which has high measurement accuracy, but there are the following problems: First, the three-coordinate measurement The detection procedure of the three-coordinate measuring instrument is complicated, which will have a great impact on the normal production of the production line; secondly, the price of the three-coordinate measuring instrument is high, and the calibration and maintenance costs are high, so its popularization and application is difficult.

Utility model content

The purpose of this utility model is to provide a simple detection device for automobile body welding fixtures in order to solve the problems of complex detection procedures, unsuitability for on-line detection, and high cost of detection in the detection of automobile body welding fixtures. The detection procedure is simple and fast, and the manufacturing cost is low, and the maintenance is convenient, and is suitable for the on-line detection of the welding fixture of the automobile body.

In order to achieve the above object, the utility model adopts the following technical solutions:

A detection device for a welding jig of an automobile body, comprising a vertical frame structure bracket, the left and right bottoms of the bracket are provided with support frames that can be connected with the fixture wire body, and a detection platform is arranged side by side on the detection platform There are vertical left drive cylinders and right drive cylinders on the ground, the lower part of the cylinder body of the left and right drive cylinders is a pressure chamber, and the end of the piston rod of the left and right drive cylinders protruding upward from the cylinder body is provided with a detachable pressure block. And a scale is provided on the side of the piston rod protruding from the cylinder body, and a cross pointer fixed on the detection platform is provided between the left and right drive cylinders. The cross pointer is set on the vertical support rod and horizontally Composed of double-headed pointers on the rod, the two ends of the double-headed pointers are respectively close to the scales of the piston rods of the left and right drive cylinders. The upper part of the bracket is horizontally equipped with a left detection cylinder and a right detection cylinder. One side of the piston in the body is provided with a piston rod protruding from the cylinder body, and the end of the piston rod is provided with a reference measuring block. The oil cylinders are coaxially arranged, and the piston rods of the left and right detection cylinders face the left and right outer sides of the bracket respectively, the pressure chamber of the left drive cylinder is connected with the oil inlet chamber of the left detection cylinder through pipelines, the pressure chamber of the right drive cylinder is connected with The oil inlet chambers of the right detection oil cylinder are connected by pipelines.

When the detection device of the utility model is in use, the bracket is installed and positioned on the fixture line body first, and the pressure blocks on the left and right drive cylinders on the detection platform are removed, and the piston rods of the left and right detection cylinders are in the starting position of retreating. At this time, the double-headed pointer on the cross pointer is just aligned with the zero position of the scale on the left and right drive cylinders on both sides. Then control the actions of the joint fixtures on the left and right sides of the clamp line body. At this time, the sides of the reference plates of the joint fixtures on both sides are close to the reference measuring blocks on the support. Then we put the pressure block on the upper end of the piston rod of the left and right drive cylinders, and the pressure block drives the pistons of the left and right drive cylinders to move down, so that the hydraulic oil in the lower pressure chamber of the left and right drive cylinders passes through the pipeline Enter the oil inlet chamber of the left and right detection cylinders, thereby pushing the piston rods of the left and right detection cylinders to move to the left and right sides until the reference measuring block touches the reference plate, at this time the piston rods of the left and right drive cylinders stop Moving down, the double-headed pointer on the cross pointer can show the actual moving distance of the piston rods of the left and right detection cylinders. Comparing the above actual moving distance with the designed theoretical distance, it can be judged whether the positioning accuracy of the reference plate meets the requirements. Since the inspector does not need to enter the fixture line body to measure with measuring tools, the inspection procedure can be greatly simplified, and the whole device has a simple structure, low manufacturing cost, and easy maintenance, so it is suitable for on-line inspection of automobile body welding fixtures.

As preferably, the piston rod positions corresponding to the left and right detection cylinders on the upper part of the bracket are respectively provided with an outer support frame and an inner support frame arranged axially along the piston rod, wherein the outer support frame is close to the reference measuring block on the piston rod. The piston rod of the right detection oil cylinder is slidably connected on the inner and outer support frames, and the piston rods of the left and right detection oil cylinders are provided with a limit ring sleeve and a reset compression spring between the inner and outer support frames. The cover leans against the inner supporting frame, one end of the return compression spring leans against the outer supporting frame, and the other end leans against the limit ring sleeve.

The return compression spring can make the piston rods of the left and right detection oil cylinders automatically be in the initial state of retreating, which is convenient for continuous detection on-line. At the same time, the zero position of the reference measuring block at the end of the piston rod can be conveniently adjusted by adjusting the position of the limit ring sleeve on the piston rod.

As preferably, the piston rods of the left and right detection cylinders are three-stage stepped shafts, which are composed of a large section connecting the piston, a small section connecting the reference measuring block, and a middle section connecting the large section and the small section, and the diameter of each section is from The large section gradually shrinks from the small section, the large section is slidably connected to the inner support frame, the small section is slidably connected to the outer support frame, the outer surface of the middle section is provided with external threads, and the limiting ring is connected to the circular ring on the middle section by threads. The base plate and the ferrule that is bent and extended from the edge of the circular base plate to the side of the inner support frame are formed. The ferrule is set on the outside of the connecting end of the large section and the middle section and is attached to the inner support frame. The middle section is also threaded with a locking One side of the locking piece is close to the circular base plate, and the other side is close to the return compression spring.

Because the piston rods of the left and right detection oil cylinders are three-stage stepped shafts, it is convenient for them to pass through the inner and outer support frames. And the limit ring sleeve is threadedly connected with the piston rod middle section of the left and right detection oil cylinders, which is convenient to adjust the position of the limit ring sleeve on the piston rod, and is locked and positioned by the locking plate. Especially, the ferrule of the limit ring sleeve is sleeved on the large section, thereby ensuring that the inner support frame is always in contact with the large section when the piston rod moves, thereby avoiding the external thread of the middle section from directly contacting the inner support frame.

As a preference, the upper ends of the piston rods of the left and right drive cylinders are provided with a positioning shoulder, and the center of the pressure block is provided with a through hole, and the pressure block is sleeved on the upper ends of the piston rods of the left and right drive cylinders and is clamped on the positioning shoulder. place.

In this way, the inspector can conveniently place a briquetting block on the upper ends of the piston rods of the left and right drive oil cylinders, or take off the briquetting blocks from the upper ends of the piston rods of the left and right drive oil cylinders.

Preferably, the reference measuring block is a cylinder arranged laterally, and the end surface of the reference measuring block close to the reference plate of the combined jig is a spherical surface. Therefore, the point contact is maintained between the reference measurement block and the reference plate, and the detection accuracy is prevented from being affected by the positioning deviation of the support on the fixture line body.

As preferably, the piston cross-sectional area of the left driving oil cylinder is equal to one-tenth to one-half of the piston cross-sectional area of the left detection oil cylinder, and the piston cross-sectional area of the right driving oil cylinder is equal to one-tenth of the piston cross-sectional area of the right detection oil cylinder. One-half to one-half. Therefore, the moving distance of the piston rods of the left and right driving oil cylinders is equal to two to ten times of the moving distances of the piston rods of the left and right detecting oil cylinders, which is beneficial to improving the accuracy of the indication value of the cross pointer.

Therefore, the utility model has the following beneficial effects: the detection procedure is simple and fast, and the manufacturing cost is low, and maintenance is convenient, and it is suitable for on-line detection of welding jigs for automobile bodies.

Description of drawings

Fig. 1 is a kind of structural representation of the utility model.

Fig. 2 is a schematic diagram of the structure of the limiting ring.

In the figure: 1, bracket 11, support frame 12, inner support frame 13, outer support frame 2, detection platform 3, left detection oil cylinder 32, limit ring sleeve 321, circular base plate 322, ferrule 33, locking piece 4 , Right detection cylinder 5, reference measuring block 51, reference surface 6, left drive cylinder 62, pressure block 64, scale 7, right drive cylinder 8, cross pointer 81, pole 82, double-headed pointer 9, return compression spring.

Detailed ways

The utility model will be further described below in conjunction with the accompanying drawings and specific embodiments.

As shown in Fig. 1, a kind of detection device of automobile body welding jig, comprises a bracket 1 and a detection platform 2 of a vertically arranged frame structure, during detection, the bracket is placed and fixed in the automobile body welding production line It is used on the clamp line body for conveying the body body. Specifically, the bracket adopts a door-shaped frame structure, and the bottoms of the left and right sides of the bracket are respectively provided with support frames 11 that can be connected with the clamp line body. Each support frame has two support points before and after to stably support the entire bracket, and Set the corresponding set screws to fix the bracket on the clamp wire body.

In addition, we need to set a left detection cylinder 3 horizontally on the left side of the upper part of the bracket, and at the same time set a right detection cylinder 4 coaxial with the left detection cylinder on the right side of the upper part of the bracket. The pistons in the cylinders of the left and right detection cylinders One side of the cylinder is provided with a piston rod extending out of the cylinder, and the other side of the piston in the cylinder of the left and right detection cylinders is an oil inlet chamber, and the piston rods of the left and right detection cylinders are respectively facing the left and right outsides of the bracket. When hydraulic oil is sent into the oil inlet cavity, the piston rods of the left and right detection oil cylinders protrude toward the left and right outer sides of the support respectively. In addition, the end of the piston rod needs to be coaxially provided with a horizontally arranged cylindrical reference measuring block 5. The end face of the reference measuring block close to the reference plate of the combined fixture is the reference plane 51, and the reference surface of the reference measuring block should be When using a spherical surface, the reference surface needs to touch and fit the side of the reference plate during measurement. When the piston rods of the left and right detection cylinders are in the shrinking state of retreating, we set the position of the reference measuring block at the end of the piston rod as the initial position, and set the benchmark of the reference measuring block when the reference measuring block is in the initial position The theoretical distance value between the face and the side of the reference plate was set at 3 mm. In this way, when detection is required, we only need to measure the actual distance between the reference plane of the reference measurement block and the side surface of the reference plate to know the position deviation value of the reference plate. When the above deviation value exceeds the allowable deviation range, the positioning position of the reference plate can be adjusted and maintained to ensure the normal operation of the welding production line.

On the detection platform of the present utility model, a left drive cylinder 6 and a right drive cylinder 7 are vertically arranged side by side for driving the piston rods of the left and right detection cylinders. The lower part of the cylinder body of the left and right drive cylinders is a pressure chamber, and the end of the piston rod of the left and right drive cylinders protrudes upwards from the cylinder body to set a detachable pressure block 62, the pressure chamber of the left drive cylinder and the oil inlet chamber of the left detection cylinder They are connected by pipelines, and the pressure chamber of the right drive cylinder is connected with the oil inlet chamber of the right detection cylinder by pipelines. In order to facilitate the operation, we can set the positioning shoulder on the upper end of the piston rod of the left and right drive cylinders, and set a through hole in the center of the pressure block, so that during the test, the pressure block can be conveniently sleeved on the left and right drive cylinders. The upper end of the piston rod is positioned by the positioning shaft shoulder, and the pressure block drives the pistons of the left and right drive cylinders to move down, so that the hydraulic oil in the pressure chamber of the lower part of the cylinder body of the left and right drive cylinders enters the left and right detection cylinders through the pipeline Into the oil chamber, thereby pushing the piston rods of the left and right detection cylinders to move to the left and right sides until the datum surface of the datum measuring block touches the side of the datum plate. By measuring the downward movement distance of the piston rod of the left and right drive cylinders, the moving distance of the reference measurement block can be known, that is, the actual distance between the reference surface of the reference measurement block and the side of the reference plate, and then the reference plate can be known The positional deviation value. After the test is completed, the pressing block can be easily removed from the upper ends of the piston rods of the left and right drive cylinders. At this time, we can make the reference measuring blocks at the ends of the piston rods of the left and right detection cylinders return to the initial position, so that next test. It can be understood that the oil inlet chambers of the left and right detection cylinders, the pressure chambers of the left and right drive cylinders, and the pipelines connecting the left and right detection cylinders with the left and right drive cylinders need to be filled with hydraulic oil for left and right detection. The oil cylinder and the left and right drive oil cylinders can act synchronously.

In order to easily measure the moving distance of the reference measuring block, we can set a scale 64 on the side of the cylinder body where the piston rod of the left and right drive cylinders protrudes, and at the same time set a fixed connection between the left and right drive cylinders. The cross pointer 8 on the platform is composed of a vertical pole 81 and a double-headed pointer 82 horizontally arranged on the pole. The two ends of the double-headed pointer are respectively close to the scales of the piston rods of the left and right drive cylinders . In this way, when starting to detect, we need to remove the pressure block from the piston rods of the left and right drive cylinders, and make the piston rods of the left and right detection cylinders in a retracted contraction state, and at this time the piston rod ends The datum measuring block is in the starting position. Correspondingly, at this moment, the double-headed pointer on the cross pointer is just aligned with the zero position of the scale on the left and right drive oil cylinders on both sides. Then control the actions of the combined clamps on the left and right sides of the clamp line body, so that the sides of the reference plates of the combined clamps on both sides are close to the reference measuring block on the support. Then set the pressure block on the upper ends of the piston rods of the left and right drive cylinders and position them through the positioning shoulders, the pressure blocks drive the pistons of the left and right drive cylinders to move down, and correspondingly push the piston rods of the left and right detection cylinders to the left and right Move side to side until the datum surface of the datum gauge block touches the side of the datum plate. At this time, the piston rods of the left and right drive cylinders stop moving down, and the double-headed pointer on the cross pointer can show the moving distance of the piston rods of the left and right drive cylinders, and then through the left and right drive cylinders and the left and right detection The ratio of the piston cross-sectional areas of the cylinders calculates the actual moving distance of the piston rods of the left and right detection cylinders. Comparing the above actual moving distance with the designed theoretical distance, it can be judged whether the positioning accuracy of the reference plate meets the requirements.

In order to facilitate calculation and measurement, we can make the piston cross-sectional areas of the left and right drive cylinders and left and right detection cylinders equal, so that the piston rod movement distance of the left and right drive cylinders is equal to the piston rod movement of the left and right detection cylinders distance, so that subsequent calculation procedures can be omitted. Alternatively, we can also make the piston cross-sectional area of the left drive cylinder equal to one-tenth to one-half of the piston cross-sectional area of the left detection cylinder, and the piston cross-sectional area of the right drive cylinder equal to the piston cross-section of the right detection cylinder One-tenth to one-half of the area, so that the moving distance of the piston rods of the left and right drive cylinders is equal to two to ten times the moving distance of the piston rods of the left and right detection cylinders, which is conducive to improving the indication value of the cross pointer precision. Preferably, the ratio of the cross-sectional area of the above-mentioned pistons is one-fifth, so that the moving distance of the piston rods of the left and right drive cylinders is equal to five times of the moving distance of the piston rods of the left and right detection cylinders, and we can use the scale The displayed value of the moving distance corresponding to the scale on the scale is reduced by five times. In this way, when the piston rods of the left and right detection cylinders drive the reference measuring block to move one millimeter, the piston rods of the left and right drive cylinders move down by 5 millimeters, and the piston rods of the left and right drive cylinders corresponding to the double-headed pointer move upwards. The scale indication value of the scale is one millimeter, that is to say, we can directly read the moving distance of the reference measuring block from the scale, which greatly simplifies the measurement procedure.

Further, we can automatically retreat and reset the piston rods of the left and right detection cylinders by setting corresponding reset mechanisms. Specifically, we can respectively set the piston rods on the upper part of the bracket corresponding to the piston rods of the left and right detection cylinders to be arranged along the axial direction of the piston rods. The outer support frame 13 and the inner support frame 12, wherein the outer support frame is close to the reference measuring block on the piston rod, the outer support frame and the inner support frame are respectively provided with through holes, and the piston rods of the left and right detection cylinders are fitted inside , In the through hole of the outer support frame, so that the piston rods of the left and right detection oil cylinders are slidably connected on the inner and outer support frames, so as to improve the stability of the piston rods of the left and right detection oil cylinders when moving. In addition, the piston rods of the left and right detection oil cylinders are located between the inner and outer support frames and need to be provided with a limit ring 32 and a reset compression spring 9. The limit ring is attached to the inner support frame, and one end of the return compression spring It leans against the outer support frame, and the other end leans against the limit ring sleeve. In this way, when starting to detect, the pressure block is placed on the piston rods of the left and right drive cylinders, and the left and right drive cylinders can drive the piston rods of the left and right detection cylinders to overcome the elastic force of the reset stage spring to move; 1. When the pressure block on the piston rod of the right drive cylinder, the reset compression spring can push the piston rods of the left and right detection cylinders through the limit ring sleeve to retreat and reset until the limit ring sleeve is close to the inner support frame. At this time, the left and right The hydraulic oil in the oil inlet chamber of the driving cylinder flows back to the pressure chamber of the left and right driving cylinders through the pipeline, so that the piston rods of the left and right driving cylinders rise and reset, and the double-headed pointer points to the left and right driving cylinders again. The zero position of the scale on the piston rod of the cylinder.

The limit ring sleeve and the piston rods of the left and right drive cylinders can be detachably connected. For example, a radial set screw is set on the limit ring sleeve. When the position is determined, tighten the set screw to fix the limit ring sleeve on the piston rod. Of course, as shown in Figure 2, the limit collar can also be made of a circular base plate 321 and a collar 322 that is bent and extended from the edge of the circular base plate to the inner support frame side, and the piston rods of the left and right detection cylinders A three-stage stepped shaft is used, which consists of a large section connecting the piston, a small section connecting the reference measuring block, and a middle section connecting the large section and the small section, and the diameter of each section gradually decreases from the large section to the small section, and the large section is slidingly connected. On the inner support frame, the small section is slidably connected to the outer support frame, and the outer surface of the middle section is provided with external threads. Correspondingly, the center of the circular base plate is provided with a threaded hole, and the circular base plate is screwed to the middle section with external threads. At this time, the opening side of the ferrule faces the side of the inner support frame, and is sleeved on the outside of the end connecting the large section and the middle section. By turning the ring, the position of the limit ring on the piston rod of the left and right drive cylinders can be easily adjusted, and the reset pressure spring is attached to the circular base plate to push the piston rods of the left and right drive cylinders to move backward. Position the open end of the ferrule against the inner support frame. Of course, we can also thread a locking piece 33 on the middle section, one side of the locking piece is close to the circular base plate, and the other side is close to the return compression spring. In this way, when the limit ring is adjusted in place, we can tighten the locking piece so that the locking piece is close to the circular substrate, and then realize the self-locking of the limit ring. At this time, the double-headed pointer should point to the left and right drive The zero position of the scale on the piston rod of the cylinder.

Claims (6)

1. A detection device for an automobile body welding jig, comprising a vertically arranged frame structure support, the bottom of the left and right sides of the support is provided with a support frame that can be connected with the clamp line body, it is characterized in that it also includes a detection Platform, vertical left drive cylinder and right drive cylinder are arranged side by side on the detection platform, the lower part of the cylinder body of the left and right drive cylinders is a pressure chamber, and the piston rod ends of the left and right drive cylinders protrude upward from the cylinder body. It is a detachable pressure block, and a scale is provided on the side of the piston rod protruding from the cylinder body. A cross pointer fixed on the detection platform is provided between the left and right drive cylinders. The cross pointer is formed by a vertical rod. It consists of a double-headed pointer horizontally arranged on the support rod. The two ends of the double-headed pointer are respectively close to the scales of the piston rods of the left and right drive cylinders. The upper part of the bracket is horizontally equipped with a left detection cylinder and a right detection cylinder. 1. One side of the piston in the cylinder body of the right detection oil cylinder is provided with a piston rod protruding from the cylinder body, and the end of the piston rod is provided with a reference measuring block. The left and right detection cylinders are set coaxially, and the piston rods of the left and right detection cylinders face the left and right outer sides of the bracket respectively. The pressure chamber of the left drive cylinder is connected with the oil inlet chamber of the left detection cylinder through pipelines, and the right The pressure chamber of the driving oil cylinder is connected with the oil inlet chamber of the right detecting oil cylinder through a pipeline. 2. The detection device of a kind of automobile body welding jig according to claim 1, characterized in that, the positions of the piston rods corresponding to the left and right detection oil cylinders on the upper part of the bracket are respectively provided with outer support frames arranged axially along the piston rods and the inner support frame, wherein the outer support frame is close to the reference measuring block on the piston rod, the piston rods of the left and right detection cylinders are slidably connected to the inner and outer support frames, and the piston rods of the left and right detection cylinders are equipped with 1. A limit ring sleeve and a return pressure spring between the outer support frames, the limit ring sleeve is attached to the inner support frame, one end of the return compression spring is against the outer support frame, and the other end is against the limit ring sleeve. 3. The detection device of a kind of automobile body welding jig according to claim 2, characterized in that, the piston rods of the left and right detection oil cylinders are three-stage stepped shafts, which are composed of a large section connected to the piston, a connection reference The small section of the measuring block and the middle section connecting the large section and the small section are composed, and the diameter of each section gradually decreases from the large section to the small section. The large section is slidably connected to the inner support frame, and the small section is slidably connected to the outer support frame. The side is provided with external threads, and the limit ring is composed of a circular base plate screwed on the middle section and a ferrule bent and extended from the edge of the circular base plate to the side of the inner support frame. The outer side of the connecting end of the middle section is close to the inner supporting frame, and a locking piece is threadedly connected to the middle section. One side of the locking piece is close to the circular base plate, and the other side is close to the return pressure spring. 4. A detection device for a welding jig for an automobile body according to claim 1, 2 or 3, wherein the upper ends of the piston rods of the left and right drive cylinders are provided with positioning shoulders, and the center of the pressure block is provided with There is a through hole, and the pressure block is sleeved on the upper ends of the piston rods of the left and right drive oil cylinders and is clamped at the positioning shaft shoulder. 5. The detection device of a kind of automobile body welding fixture according to claim 1, 2 or 3, characterized in that, the reference measuring block is a cylinder arranged horizontally, and the reference measuring block is close to the end face of the reference plate of the combined fixture for the sphere. 6. A detection device for a welding jig for an automobile body according to claim 1, 2 or 3, wherein the cross-sectional area of the piston of the left drive cylinder is equal to one-tenth of the cross-sectional area of the piston of the left detection cylinder To one-half, the piston cross-sectional area of the right drive cylinder is equal to one-tenth to one-half of the piston cross-sectional area of the right detection cylinder.