JPS6242955Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a liquid injection gun for pressurizing liquid into a liquid supply port having a specific shape.

An example of pressurizing liquid into a liquid supply port is injecting brake fluid into a reservoir tank in the manufacturing process of an automobile. In this case, conventionally, brake fluid is injected from the injection gun by pressing a sealing member such as rubber provided on the flange near the tip of the injection gun to the top or outer edge of the fluid supply port of the reservoir tank. Ta. Therefore, the seal between the tip of the injection gun and the liquid supply port of the reservoir tank may be incomplete because it is difficult to maintain parallelism between the flange of the injection gun and the upper edge of the liquid supply port. Over time, brake fluid sometimes leaked from the seal.

Therefore, an O-ring is fitted to the outer circumference of the nozzle to be inserted into the liquid supply port, and by pressing this O-ring, the outer shape is expanded so that it comes into pressure contact with the inside of the liquid supply port. A device has been devised that grips the object from the outside. Structures for this purpose include those that use two cylinders and those that use one cylinder and a toggle mechanism. However, those using two cylinders have the disadvantage of requiring many high-precision parts, and those using a toggle mechanism require a complicated link mechanism, and the link parts that are subjected to high pressure often wear out. There is a problem. Both of them have problems in that they are large and heavy due to their structure, and have poor workability.

This invention was made to eliminate these drawbacks and solve the problems, and it uses one cylinder to compress the annular sealing member (O-ring) and grip the outside of the liquid supply port. The structure is simplified, weight is reduced, workability is improved, and maintenance is simplified.

Next, an embodiment of this invention will be described with reference to the drawings. In FIG. 1, 1 is a liquid injection gun, and 2 is a cylindrical main body. An air cylinder 3 is attached to the upper part of the main body 2, and the lower part thereof faces a liquid supply port 4 into which liquid is to be press-injected.
The liquid supply port 4 has an expanded portion 5 whose upper end expands outward, and a flange 6 is provided at a portion slightly below the expanded portion 5, and the liquid supply gun 1 has a structure described later. It is designed to accommodate this shape.

Three lock arms 7 are provided on the main body 2 at equal intervals, and the lower end of the flange 6 of the liquid supply port 4 is gripped by a claw portion at the lower end of the lock arms 7.
An oil level adjusting pipe 8 that is inserted into the liquid supply port 4 protrudes from the lower part of the main body 2. Further, a hose 10 of the liquid feeder 9 is connected to the side part, and an air hose 11 is connected to the air cylinder 3. Air hose 11 is connected to an air supply source (not shown). Note that the cylinder head 1 located between the main body 2 and the air cylinder 3
2 is provided with an adjustment screw 13.

The internal structure of the liquid injection gun 1 will be explained with reference to FIG. Air cylinder 3 has air hose connection port 1
4 is provided, and the above-mentioned air hose 11 is connected thereto. A piston (not shown) is provided inside the air cylinder 3.
When pressurized air is applied from the air hose connection port 14, the lock arm cam 16 is lowered via the piston rod 15. The lock arm cam 16 has a tapered cam portion 17 at its lower end, and this portion contacts a cam portion 18 at the upper end of the lock arm 7, which will be described later.

The upper end of a pushing rod 19 is attached to the inner side of the cam portion 17 of the lock arm cam 16 by screwing. This push rod 19
passes through a hole 21 of an O-ring holder 20, which will be described next, and is in contact with the upper end of an O-ring pusher 22 provided inside this O-ring holder 20. A liquid hose connection port 23 is provided on the side of the main body 2, to which a hose 10 from the liquid feeder 9 shown in FIG. 1 is connected.

A nozzle 24 is attached to the main body 2 by screwing. The nozzle 24 communicates with the liquid hose connection port 23, and discharges the fluid received therefrom downward. Nozzle 24
An oil level adjustment pipe 8 is attached to the lower end of the pipe 8 by screwing. The aforementioned O-ring holder 20 is attached to the outer peripheral portion of the nozzle 24 by screwing. This O-ring holder 20
is cup-shaped, and an O-ring 25, which is an annular sealing member that presses into contact with the expanded portion 5 of the liquid supply port 4, is fitted to the lower end thereof.

The lower end of the O-ring pusher 22 provided between the O-ring holder 20 and the nozzle 24 and the nozzle 2
4 and the flange 26 formed at the lower end of the
An O-ring 27, which is an annular sealing member, is fitted. During use, this O-ring 27 is positioned inside the liquid supply port 4 as shown in the figure. As mentioned above, three lock arms 7 are provided at equal intervals on the main body 2 (see FIG. 3). This lock arm 7 is the lock arm pin 2.
8, and a claw 29 formed at the lower end engages with the lower side of the flange 6 of the liquid supply port 4. Recesses 30 and 31 are provided in opposing positions of the O-ring holder 20 and the lock arm 7, and a lock arm spring 32 is inserted therein in a compressed state.

This liquid injection gun 1 configured in this way,
Use it like this: First, air hose connection port 1
4 is connected to the air hose 11, and the liquid hose connection port 23 is connected to the liquid feeder 9 via the hose 10. Then, the main body 2 is placed above the liquid supply port 4 as shown in FIG. 2, so that the lower end of the nozzle 24 enters the inside of the liquid supply port 4. Then, air is supplied to the air cylinder 3.

When air cylinder 3 operates, piston rod 1
5, the lock arm cam 16 also descends. As a result, the O-ring pusher 22 descends via the pushing rod 19, which simultaneously descends, compressing the O-ring 27. For this reason, the O-ring 27 expands in diameter to form a flat shape and tightly seals between the nozzle 24 and the liquid supply port 4. On the other hand, as the lock arm cam 16 descends, the cam portion 18 is attached to the cam portion 17 of the lock arm cam 16.
The lock arm 7, which is in contact with the liquid injection gun 1, rotates counterclockwise in FIG. As a result, the liquid injection gun 1 is held in the correct position and posture with respect to the liquid supply port 4.

After the liquid injection gun 1 is held in this way,
By operating the liquid feeder 9, liquid is supplied to the liquid supply port 4 via the nozzle 24 and the oil level adjustment pipe 8. In this case, the holding force and related position of the liquid injection gun 1 to the liquid supply port 4 are adjusted by adjusting the adjuster screw 13.
The degree of compression of the O-ring 27 is adjusted by adjusting the position of the O-ring holder 20 with respect to the nozzle 24 (screw adjustment).
Perform position adjustment (screw adjustment) to When the liquid supply is completed and the air supply is stopped, the O-ring 27
is released, and the lock arm 7 is rotated clockwise by the force of the lock arm spring 32, causing the pawl 29 to separate from the flange 6.

Since this invention is constructed as described above, the entire device can be manufactured in a cylindrical shape with the nozzle at the center, so it can be made small and lightweight. It also has the advantage of more reliable operation and fewer failures than the conventional two-cylinder type, and no play compared to the torque type. It also has the advantage of improving maintainability and reducing manufacturing costs.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of an embodiment of this invention, FIG. 2 is a longitudinal sectional view of the liquid injection gun in FIG. 1, and FIG. 3 is a sectional view taken along the line - in FIG. 1...Liquid injection gun, 2...Main body, 3...Air cylinder, 4...Liquid supply port, 7...Lock arm, 16...Lock arm cam, 17, 18...
Cam part, 19...Pushing rod, 22...O
Ring pusher, 23...Liquid hose connection port, 2
4... Nozzle, 26... Flange, 27... O-ring, 28... Lock arm pin.

Claims (1)

[Scope of utility model registration request] a main body having an air cylinder attached to the upper part; a nozzle provided at the lower part of the main body and communicating with a liquid hose connection port; an annular sealing member fitted to the upper part of a flange formed at the lower end of the nozzle; A lock arm cam that is driven downward by an air cylinder, a pushing rod whose upper end is attached to the lock arm cam and moves together, and a pusher that is attached to the lower end of the pushing rod and presses the annular seal member from above. and is pivotally connected to the main body by a lock arm pin, its upper end cam part contacts a tapered cam part formed at the lower end of the lock arm cam, and its lower end grips the outer periphery of the liquid supply port. A liquid injection gun characterized by being equipped with a lock arm.