CN105269235B - Pneumatic double-cylinder liner positioning mechanism for automobile welding fixture - Google Patents

Abstract

The invention discloses a pneumatic dual-air-cylinder type liner positioning mechanism of an automobile welding clamp. A piston rod of a first air cylinder is connected with the lower end of a guide column. A positioning pin is installed at the top end of the guide column. A second air cylinder is installed on a guide barrel and connected with one end of a pressing arm, and a pressing head is fixed to the bottom face of the other end of the pressing arm. A big-end-up two-section type stepped hole is formed in the center of the positioning pin, and a long countersunk bolt is arranged in the stepped hole in a penetrating manner. Mounting holes are formed in the four corners of a positioning ring, and a convex block is arranged between every two adjacent mounting holes in the circumferential direction. A connector is arranged between the guide column and the piston rod of the first air cylinder. A boss at the head of the connector is clamped into a T-shaped through slot in the lower end of the guide column. The lower end of the connector is in threaded connection with the piston rod of the first air cylinder. A connection plate is arranged between the guide barrel and the second air cylinder and is formed by stamping a steel plate. The connection plate is provided with a first plate body and a second plate body, and an obtuse angle is formed between the first plate body and the second plate body. The pneumatic dual-air-cylinder type liner positioning mechanism of the automobile welding clamp is convenient to control and flexible and reliable in running. Moreover, liner pipes can be positioned accurately and stably.

Description

Pneumatic double-cylinder liner positioning mechanism for automobile welding fixture

technical field

The invention belongs to the technical field of fixtures, and in particular relates to a pneumatic double-cylinder liner positioning mechanism for an automobile welding fixture.

Background technique

The rear axle assembly of the automobile is composed of a beam, a longitudinal arm, a spring seat, a liner, a parking brake cable bracket, an oil pipe bracket and a shock absorber mounting seat, etc., and the longitudinal arms are welded symmetrically at both ends of the beam. Weld liner, parking brake cable bracket, shock absorber mount and oil pipe bracket in sequence. During welding, it is necessary to position the beam, longitudinal arm, spring seat, liner, etc. in different steps with the help of multiple tooling. The existing liner positioning tool has complex structure, large space occupation, high cost, difficult alignment, and poor positioning stability, which makes it difficult to guarantee the welding quality and fail to meet the requirements of consistent production.

Contents of the invention

The technical problem to be solved by the present invention is to provide a simple and reliable pneumatic double-cylinder liner positioning mechanism for automobile welding jigs.

The technical scheme of the present invention is as follows: a pneumatic double-cylinder liner positioning mechanism for automobile welding fixtures, characterized in that: a guide cylinder is fixed on the cylinder body of the first cylinder, the guide cylinder is a steel structure, and the piston rod of the first cylinder Extend vertically upwards into the guide cylinder, and be connected with the lower end of the guide post, install a locating pin on the top of the guide post, the locating pin can stretch out of the guide cylinder, and a locating ring is arranged on the periphery of the locating pin, the The positioning ring is installed on the top surface of the guide cylinder; a second cylinder is installed on the guide cylinder, the axis line of the second cylinder is parallel to the axis line of the first cylinder, and the piston rod of the second cylinder is vertical Protrude upwards and connect with one end of the pressing arm, and fix the pressing head on the bottom surface of the other end of the pressing arm, and the pressing head is located directly above the positioning pin;

The top surface of the positioning pin and the peripheral side are transitioned through a tapered surface. The bottom of the positioning pin is integrally formed with a short column, which is embedded in the matching groove provided at the upper end of the guide column. A two-stage stepped hole with a large upper part and a smaller one at the lower part. A long countersunk bolt is pierced in the stepped hole, and the lower end of the long countersunk bolt extends into the guide post to fix the positioning pin and the guide post together;

The outer contour of the positioning ring is a square with rounded corners at four corners. Mounting holes are provided at the four corners of the positioning ring, and countersunk screws are inserted in each mounting hole to fix the positioning ring and the guide cylinder together. Protrusions are arranged between two adjacent mounting holes in the circumferential direction, the protrusions are evenly distributed according to the circumference, and the bottom of the protrusions is integrated with the top surface of the positioning ring;

A "T"-shaped through groove is opened at the lower end of the guide post, and a joint is provided between the guide post and the piston rod of the first cylinder. The joint is a bolt structure, and the head boss of the joint snaps into the guide In the "T"-shaped through groove at the lower end of the column, the two are snap-fitted, and the lower end of the joint is threadedly connected with the piston rod of the first cylinder, locked by a nut, and the nut is tightly attached to the top surface of the piston rod of the first cylinder;

The guide cylinder is square, and a connection plate is provided between the guide cylinder and the second cylinder. The connection plate is stamped and formed by a steel plate, and has a first plate body and a second plate body at an obtuse angle to each other. The first plate body and the second plate body are One side of the guide cylinder is attached, the first plate body and the guide cylinder are fixed by bolts, the second plate body is attached to the positioning plane set on the cylinder block of the second cylinder, and the second plate body and the second cylinder are also Fastened by bolts.

Using the above technical scheme, when positioning the liner of the automobile rear axle assembly, the liner is first placed on the positioning ring, and then the piston rod of the first cylinder is driven to extend upward, so that the guide post moves upward together with the positioning pin, and the positioning pin extends Insert the liner into the liner so that the liner will not shake in the plane, and then drive the piston rod of the second cylinder to move the piston rod of the second cylinder to drive the pressing arm to move downward until the pressure head is pressed against the top of the liner. The combination of the indenter and the positioning ring can realize the clamping and pressing of the liner, combined with the positioning pin in the liner, it can ensure the stability of the liner positioning, so that the welding quality between the liner and the longitudinal arm Guaranteed to meet the requirements of consistent production.

The invention adopts double cylinders to provide power, has few parts, simple and compact overall structure, easy assembly, small volume, small space occupation, low cost and convenient manipulation.

The transition between the top surface of the positioning pin and the surrounding side is through a tapered surface, which acts as a guide and makes it easier for the positioning pin to enter the liner; the lower end of the positioning pin is inlaid with the guide post and passed through the long countersunk head bolt in the center Tightening, on the one hand, the firmness of the connection is good, and the positioning pin will not loosen; on the other hand, the head of the long countersunk bolt is not exposed and will not interfere with the pressure head.

The positioning ring supports the liner through four protrusions evenly distributed on the circumference, the support points are evenly distributed, and the reliability of clamping the positioning liner with the pressure head is good. The positioning ring is connected with the guide cylinder by four countersunk screws, which is not only securely connected, but also easy to disassemble, and the heads of the countersunk screws are not exposed, which will not cause adverse effects on the supporting liner.

Since the guide post is restricted by the guide cylinder and can only move in the up and down direction, the guide post and the piston rod of the first cylinder are connected by a joint, so that the upper end of the joint is engaged with the guide post, and the lower end of the joint is connected with the first cylinder. The piston rod is fastened by threads, which greatly simplifies the installation structure between the guide post and the first cylinder piston rod, and the disassembly operation is very convenient and fast.

The connecting plate is used to connect the guide cylinder and the second cylinder. The connecting plate has a simple shape and is easy to process and manufacture; the connecting plate is a steel plate with good structural strength and will not be deformed or damaged. The two plate bodies of the connecting plate are attached and fixed to the guide cylinder and the second cylinder respectively, the contact area between the connecting plate and the guiding cylinder and between the connecting plate and the second cylinder is large, and the connection reliability is good.

In order to reduce wear as much as possible and prolong the service life, a wear-resistant liner is embedded inside the guide cylinder, and the wear-resistant liner is slidably fitted with the guide post.

In order to simplify the structure and facilitate processing and assembly, the pressure head is a rectangular structure, and the pressure head is connected to the pressure arm through a row of bolts.

Beneficial effects: the present invention is ingenious in concept, reasonable in design, easy to implement, simple and compact in structure, easy to assemble, small in size, small in space, low in cost, not only convenient in operation, flexible and reliable in operation, but also accurate in liner positioning And stability, which is conducive to the welding installation of the liner, the welding quality is guaranteed, and it can meet the requirements of consistent production.

Description of drawings

Fig. 1 is a structural schematic diagram of the present invention.

Fig. 2 is a sectional view along line A-A of Fig. 1 .

Fig. 3 is a structural schematic diagram of the guide post.

Fig. 4 is a structural schematic diagram of the positioning ring.

detailed description

Below in conjunction with accompanying drawing and embodiment the present invention will be further described:

As shown in Figure 1 and Figure 2, a guide cylinder 2 is provided on the cylinder body of the first cylinder 1, the guide cylinder 2 is located above the cylinder body of the first cylinder 1, and the guide cylinder 2 is fixedly connected with the cylinder body of the first cylinder 1 together. The guide cylinder 2 is a steel structure, and the shape of the guide cylinder 2 is square, that is, the outer contour of the cross section of the guide cylinder 2 is square. The piston rod of the first cylinder 1 extends vertically upwards into the guide cylinder 2, and a guide post 3 is arranged above the piston rod of the first cylinder 1. The guide post 3 is located in the guide cylinder 2, and the guide post 3 and the guide cylinder 2 are embedded. The wear-resistant liner 12 is a sliding fit.

As shown in FIG. 2 and FIG. 3 , a “T”-shaped through groove 3 a is provided at the lower end of the guide post 3 , and a joint 9 is provided between the guide post 3 and the piston rod of the first cylinder 1 . The joint 9 is a bolt structure, and the head boss of the joint 9 snaps into the "T"-shaped through groove 3a at the lower end of the guide post 3, and the two snap fit. The lower end of the joint 9 extends into the piston rod of the first cylinder 1, and the joint 9 is threadedly connected with the piston rod of the first cylinder 1, and is locked by a nut 10, which is sleeved on the joint 9, and the nut 10 is tightly attached to the first cylinder. Top surface of cylinder 1 piston rod.

As shown in Figure 1 and Figure 2, a positioning pin 4 is installed on the top of the guide post 3, and the top surface of the positioning pin 4 and the peripheral side are transitioned through a tapered surface. The bottom of the positioning pin 4 is integrally formed with a short column 4a, which The column 4a is embedded in the matching groove opened at the upper end of the guide column 3 . In the center of the positioning pin 4, there is a two-stage step hole with a large upper part and a smaller lower part. A countersunk head long bolt is passed through the step hole, and the lower end of the countersunk head long bolt extends into the guide post 3, and the positioning pin 4 and the guide post 3 are fixed together, and the positioning pin 4 can extend upwards out of the guide cylinder 2 under the drive of the guide post 3 .

As shown in Fig. 1, Fig. 2 and Fig. 4, a locating ring 5 is arranged on the periphery of the locating pin 4, the inner edge of the locating ring 5 is circular, and the outer contour of the locating ring 5 is rounded at four corners. square. Mounting holes 5a are provided at the four corners of the positioning ring 5. The mounting holes 5a are two-stage stepped holes with a large upper part and a smaller lower part. Countersunk screws are set in each mounting hole 5a, and the positioning ring 5 passes through four countersunk screws. It is fixed together with the guide cylinder 2. Protrusions 5b are arranged between two adjacent mounting holes 5a in the circumferential direction, and the protrusions 5b are evenly distributed on the circumference, and the bottom of the protrusions 5b is connected with the top surface of the positioning ring 5 as a whole.

As shown in FIG. 1 , a second air cylinder 6 is arranged beside the guide cylinder 2 , and the axis line of the second air cylinder 6 is parallel to the axis line of the first air cylinder 1 . A connecting plate 11 is provided between the guide cylinder 2 and the second cylinder 6. The connecting plate 11 is stamped and formed by a steel plate, and has a first plate body and a second plate body which are mutually obtuse. The first plate body of the connecting plate 11 is attached to one side of the guide cylinder 2, and the first plate body and the guide cylinder 2 are fixed by bolts. The second plate body of the connecting plate 11 is attached to the positioning plane provided on the cylinder block of the second cylinder 6, and the second plate body and the second cylinder 6 are also fixed by bolts. The piston rod of the second cylinder 6 stretches out vertically upwards, and is connected with one end of the pressing arm 7 , and the bottom surface of the other end of the pressing arm 7 is fixed with a pressure head 8 , which is positioned directly above the positioning pin 4 . The pressing head 8 is preferably a rectangular block structure, and the pressing head 8 is connected to the pressing arm 7 through a row of bolts.

The working principle of the present invention is as follows:

When positioning the liner of the automobile rear axle assembly, first place the liner on the positioning ring 5 so that the liner is supported by the four protrusions 5b on the positioning ring 5, and then drive the piston rod of the first cylinder 1 to extend upward , so that the guide post 3 moves upward together with the positioning pin 4, and the positioning pin 4 is inserted into the liner for positioning, so that the liner will not shake in the plane, and then the piston rod of the second cylinder 6 is driven to move, so that the second cylinder 6 The piston rod drives the pressing arm 7 to move downward until the indenter 8 presses on the top surface of the liner, and the indenter 8 and the positioning ring 5 cooperate to realize the clamping and pressing of the liner, combined with the positioning in the liner Pin 4 can ensure the accuracy and stability of the liner positioning.

Claims (3)

1. a kind of pneumatic pair of air-cylinder type bushing pipe detent mechanism of auto welding jig, fixed guide on the cylinder body of the first cylinder (1) Cylinder (2), the piston rod of the first cylinder (1) stretches in guide cylinder (2), equipped with the second gas on described guide cylinder (2) straight up Cylinder (6), the axial line of the second cylinder (6) is paralleled with the axial line of the first cylinder (1), the piston rod of described second cylinder (6) Stretch out straight up, and be connected with one end of pressure arm (7), in the fixing pressure head (8) in the bottom surface of pressure arm (7) other end, its feature exists In: guide cylinder (2) is steel structure, and the piston rod of the first cylinder (1) is connected with the lower end of guide pillar (3), in described guide pillar (3) Alignment pin (4) is installed on top, and alignment pin (4) can stretch out guide cylinder (2) outward, be provided with positioning in the periphery of described alignment pin (4) Ring (5), this locating ring (5) is installed on the top surface of guide cylinder (2), and described pressure head (8) is located at the surface of alignment pin (4)；

Pass through conical surface transition, the bottom of this alignment pin (4) is formed with short between the top surface of described alignment pin (4) and all sides Post (4a), short column (4a) embeds in the adaptation groove that guide pillar (3) upper end opens up, and offers upper big at the center of described alignment pin (4) Under little two-part stepped hole, wear countersunk head stay bolt in this stepped hole, guide pillar (3) is stretched in the lower end of described countersunk head stay bolt In, alignment pin (4) and guide pillar (3) are fixed together；

The outline of described locating ring (5) be four angles be rounded down square, open up installation at four angles of locating ring (5) Hole (5a), wears sunk screw in each installing hole (5a), locating ring (5) and guide cylinder (2) is fixed together, in circumferential two-phase It is provided with projection (5b), projection (5b) is circumferentially uniformly distributed, and the bottom of projection (5b) and locating ring between adjacent installing hole (5a) (5) top surface is connected as a single entity；

Offer " t " shape groove (3a) in the lower end of described guide pillar (3), and guide pillar (3) and the first cylinder (1) piston rod it Between be provided with joint (9), described joint (9) is bolt arrangement, and the head boss of this joint (9) snaps in " t " shape of guide pillar (3) lower end In groove (3a), both are engaged by clamping, and the lower end of joint (9) is connected with the piston rod thread of the first cylinder (1), by nut (10) Locking, nut (10) is close to the top surface of the first cylinder (1) piston rod；

Described guide cylinder (2) is square, is provided with connecting plate (11), described connecting plate between guide cylinder (2) and the second cylinder (6) (11) it is molded by steel plate punched, there is the first plate body and second plate body at obtuse angle each other, one of the first plate body and guide cylinder (2) Fitting in side, is bolted between the first plate body and guide cylinder (2), and the second plate body and the second cylinder (6) cylinder body are arranged Positioning plane laminating, fix also by bolt between the second plate body and the second cylinder (6).

2. pneumatic pair of air-cylinder type bushing pipe detent mechanism of auto welding jig according to claim 1 it is characterised in that: in institute The inside stating guide cylinder (2) is embedded with wear-resisting bushing pipe (12), and described wear-resisting bushing pipe (12) is slidably matched with guide pillar (3).

3. pneumatic pair of air-cylinder type bushing pipe detent mechanism of auto welding jig according to claim 1 it is characterised in that: described Pressure head (8) is rectangular block structure, and this pressure head (8) is connected with pressure arm (7) by row's bolt.