Method For Manufacturing Square Shaft Head Inflatable Shaft

The utility model belongs to the field of mechanical equipment transmission parts, and is widely used in the rewinding and unwinding of various mechanical equipment, and particularly relates to a square shaft head air expansion shaft.

Background technique:

The inflatable shaft is a special rewinding and unwinding shaft, that is, the shaft that can be expanded after high-pressure inflation, and the shaft that quickly retracts after deflation is called the inflatable shaft. The user only needs to prepare the air source, and the air pressure is controlled within the range of 0.5-0.6Mpa. When the reel core needs to be locked, it can be completed as long as the inflating handle faces the air nozzle on the inflatable shaft, and the reel core needs to be unloaded. When feeding, press the sliding air core on the air nozzle by hand to deflate. Inflatable shafts can be applied to all machinery and equipment used for winding and unwinding.

The main structure of the traditional inflatable shaft is composed of a shaft tube, a shaft head, an air bag, an inner blade, a return spring, and a long key bar. A number of waist-shaped holes are machined on the circumference of the shaft tube, and a long key bar passes through the middle, and the long key bar is fixed to the inner blade plate. The return spring is installed on the inner leaf plate to play a role of returning, and the airbag is encapsulated inside. Finally, the shaft head is fixed at both ends of the shaft tube for support. When in use, the inflation gun inflates the airbag through the inflation nozzles at both ends of the inflation shaft. The airbag expands, compresses the return spring, pushes the inner leaf plate to move radially outward, and drives the long key bar to press against the inner wall of the material roll. Relying on friction to transmit torque, the inflatable shaft drives the roll of material to rotate. When unloading, press the air nozzle by hand to release the compressed air, the return spring releases the pressure, the inner leaf plate and the long key bar return to the original position, and the material roll is withdrawn. The traditional inflatable shaft has the following disadvantages:

One: The matching part of the traditional inflatable shaft head and the chuck is a square structure, with a large matching gap, too much noise during rotation, and easy to wear.

Two: If the square structure of the matching part of the shaft head and the chuck is designed with a small gap, the chuck will not be easy to close and open, and the inflatable shaft will not be easy to come out.

Technical realization elements:

The purpose of the utility model is to provide a square-headed inflatable shaft, which can realize low clearance fit between the inflatable shaft and the chuck.

In order to achieve the foregoing objective, the embodiment of the present invention provides a square shaft head inflatable shaft, including a shaft tube, a shaft head, an air bag, an inner blade, a long key bar, an inflation nozzle, and a screw. The shaft head is inserted into the shaft tube At both ends, the shaft head is provided with a plurality of threaded holes, the shaft tube is provided with holes at corresponding positions, the shaft head and the shaft tube are fixed by screws, and the air filling nozzle is perpendicular to the axial direction of the shaft tube, The inflation nozzle passes through the shaft tube and communicates with the shaft head, the air bag is installed inside the shaft tube, the inner blade is installed inside the shaft tube, the long key bar is installed on the inner blade, and the long key The strip passes through the cylindrical surface of the shaft tube, and the material roll is wound on the cylindrical surface of the shaft tube. The shaft heads at both ends of the shaft tube are placed on the chuck, and the shaft heads are square.

　　Further, it also includes a return spring installed at both ends of the long key bar.

　　 Preferably, the hole is a countersunk hole, and the screw is a countersunk screw.

　　 Preferably, the airbag is installed in the center of the shaft tube.

　　 Preferably, there are six long key bars, and the six long key bars are divided into two groups, each group of long key bars are evenly distributed, and the two groups of long key bars are spaced apart.

　　The inner part of the quadrilateral plane of the shaft head is processed with a slope.

　　 Preferably, the inclination angle of the slope is 3 degrees.

　　 Preferably, the shaft head is heat-treated by induction hardening.

　　The square part of the square shaft head of the embodiment of the utility model is matched with the square part of the chuck, the structure is simple, the processing is relatively easy, and the economic benefit is outstanding. It greatly reduces the noise at work, prolongs the service life of the inflatable shaft, and fully meets the functional requirements.


In another embodiment of the present invention, there are six long key strips 7, and the six long key strips are divided into two groups, each group of long key strips is evenly distributed, and the two groups of long key strips are spaced apart. , This design of the long key strip can better realize the drive of the material roll.

The inner part of the quadrilateral plane of the shaft head 2 is each processed with a slope α. The slope avoids interference and solves the problem that the chuck is difficult to close and open when the square shaft head of the inflatable shaft and the chuck have a low clearance fit.

The slope angle is 3 degrees.

The shaft head is heat-treated by high-frequency quenching, which greatly increases the hardness of the square part and achieves the purpose of durability.

After the inflatable shaft is loaded, the inflation gun inflates the airbag through the inflation nozzle, the airbag expands, compresses the return spring, and pushes the inner leaf plate to drive the long key bar to press against the inner wall of the material roll. Rely on friction to transmit torque. After loading, the inflatable shaft is put into the square mouth of the chuck on the left and the right. After the chuck is easily closed, the chuck supports and drives the rotation work.

When unloading, easily open the chuck. After the inflatable shaft comes out, press the inflator nozzle with your hand to release the compressed air, reset the spring plate to release the pressure, the long key bar returns to the original position, and the material roll exits.

After the inflation nozzle is inflated, the airbag in the inflatable shaft expands, pushing the inner page plate to drive the long key bar to jam the material roll, the material roll is no longer loose, supported by the chuck and passively rotating the material.

The principle of the utility model is: when the square shaft head of the inflatable shaft is put into the square mouth of the chuck, the 3 degrees inside the square plane of the shaft head just avoid the interference part, so that the chuck can be easily closed and opened easily. The structure is simple, and the effect is obvious. Through the high-frequency quenching chuck, the mating surface is not easy to wear during work and the gap becomes larger, which greatly extends the service life of the inflatable shaft.

The above descriptions are only the preferred embodiments of the present utility model and are not intended to limit the present utility model. For those skilled in the art, the present utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc., made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Technical characteristics:

1. An inflatable shaft with a square shaft head, characterized in that it comprises a shaft tube, a shaft head, an air bag, an inner blade, a long key bar, an inflation nozzle, and a screw. The shaft head is inserted into both ends of the shaft tube. The shaft head is provided with a plurality of threaded holes, the shaft tube is provided with holes at corresponding positions, the shaft head and the shaft tube are fixed by screws, the air filling nozzle is perpendicular to the axial direction of the shaft tube, and the air filling nozzle penetrates Pass the shaft tube and communicate with the shaft head, the airbag is installed inside the shaft tube, the inner blade is installed inside the shaft tube, the long key bar is installed on the inner blade, and the long key bar passes through the shaft tube The material roll is wound on the cylindrical surface of the shaft tube, the shaft heads at both ends of the shaft tube are placed on the chuck, and the shaft head is square.

2. An inflatable shaft with a square shaft head according to claim 1, characterized in that it further comprises a return spring which is installed at both ends of the long key bar.

3. The square-head inflatable shaft according to claim 1, wherein the hole is a countersunk hole, and the screw is a countersunk screw.

The inflatable shaft with a square shaft head according to claim 1, wherein the airbag is installed in the center of the shaft tube.

The inflatable shaft with a square shaft head according to claim 1, wherein there are 6 long key bars, and the 6 long key bars are divided into two groups, and each group of long key bars is evenly distributed , The interval distribution between the two sets of long key bars.

The inflatable shaft with a square shaft head according to claim 1, wherein the inner part of the quadrilateral plane of the shaft head is each processed with a slope.

The inflatable shaft with a square shaft head according to claim 6, wherein the inclination angle of the slope is 3 degrees.

8. The inflatable shaft with a square shaft head according to claim 1, wherein the shaft head is heat treated by high frequency quenching.

Technical summary

The utility model provides an inflatable shaft with a square shaft head, which includes a shaft tube, a shaft head, an air bag, an inner leaf plate, a long key bar, an inflation nozzle, and a screw. The shaft head is inserted into both ends of the shaft tube. A plurality of threaded holes are provided on the shaft tube, the shaft tube is provided with holes at corresponding positions, the shaft head and the shaft tube are fixed by screws, the air filling nozzle is perpendicular to the axial direction of the shaft tube, and the air filling nozzle passes through the shaft Tube and communicate with the shaft head, the airbag is installed inside the shaft tube, the inner blade is installed inside the shaft tube, the long key bar is installed on the inner blade, and the long key bar passes through the cylinder of the shaft tube The material roll is wound on the cylindrical surface of the shaft tube, and the shaft heads at both ends of the shaft tube are placed on the chuck. The shaft head is square. The utility model has simple structure, easy processing and outstanding economic benefits. It greatly reduces the noise at work, prolongs the service life of the inflatable shaft, and fully meets the functional requirements.