CN114321519A - Reducing plastic hose and forming method - Google Patents

Abstract

The invention discloses a variable-diameter plastic hose and a molding method. The variable-diameter plastic hose is made of an equal-diameter plastic hose by a thermal stretching process. The variable-diameter plastic hose is set in the electrode arm cooling channel, the small-diameter section of the variable-diameter plastic hose is adapted to the cooling channel of the electrode arm welding end, and the large-diameter section of the variable-diameter plastic hose is adapted to the cooling channel of the electrode arm inlet cooling water end. match. A variable diameter hose can match the cooling channel structure of the electrode arm, and there will be no separation of the two water pipes during use, which greatly ensures the cooling effect of the electrode arm.

Description

A kind of variable diameter plastic hose and molding method

technical field

The invention relates to the technical field of plastic hoses for electrode arms, in particular to a variable diameter plastic hose and a molding method.

Background technique

At present, most of the electrode arms used in resistance spot welding servo welding torches are made of aluminum alloy. During the welding process, the welding torch needs to be internally water-cooled for the welding position, electrode rod, and electrode cap, and all conductive contact surfaces inside the welding torch need to be connected. Water cooling. Since the principle of resistance welding is that the large current generated in the welding process melts the base metal, so that two or several layers of boards are welded together, the high current will generate a lot of heat during the welding process. Rapid cooling to increase the service life of the electrode, so the electrode arm needs to be arranged with a cooling water pipe for water cooling, so that the cooling water can reach the electrode rod and the welding part of the electrode cap.

冷却出水一端通道直径为

采用

的塑料软管与

套接，

的塑料软管套装在

塑料软的外周，两管道采用粘结剂粘结。

的塑料软管匹配直径为

的冷却水通道，

的塑料软管匹配

的冷却水通道，从而保证一定的进水流速和回水流速。现有冷却水管可以满足电极臂进出冷却水流量流速的要求，但是采用套装粘结方式构成的冷却水管在使用过程中易发生两根冷水水管的脱离，影响电机臂的冷却效果。The cooling water pipes of the existing motor arms are generally bonded by sleeves to match the size of the cooling water channels inside the electrode arms. Referring to Figure 1, the diameter of the cooling water channel at the inlet end of the electrode arm is

The diameter of the channel at one end of the cooling water is

use

of plastic hoses with

socket,

of plastic hose set in

The outer periphery of the plastic is soft, and the two pipes are bonded with an adhesive.

The matching diameter of the plastic hose is

cooling water channel,

of plastic hoses to match

The cooling water channel is used to ensure a certain inlet water flow rate and return water flow rate. The existing cooling water pipes can meet the requirements of the flow rate of cooling water in and out of the electrode arms, but the cooling water pipes formed by sleeve bonding are prone to detachment of the two cold water pipes during use, which affects the cooling effect of the motor arms.

SUMMARY OF THE INVENTION

In order to solve the above technical problems, the present invention provides a variable diameter plastic hose and a molding method.

The technical scheme adopted in the present invention is:

The utility model relates to a plastic hose with a variable diameter, which is made of an equal-diameter plastic hose by a thermal stretching process.

Further, the variable-diameter plastic hose includes a large-diameter section and a small-diameter section, the pipe diameter of the large-diameter section is equal to the pipe diameter of the hose before stretching, and the pipe diameter of the small-diameter section is smaller than the pipe diameter of the hose before stretching.

小径段的管径为

Further, the diameter of the large diameter section of the reducing plastic hose is

The diameter of the small diameter section is

The molding method of any one of the above-mentioned variable diameter plastic hoses includes the following steps:

1) Insert a forming rod whose outer diameter is equal to the inner diameter of the small-diameter pipe after reducing the diameter into one end of the plastic hose;

2) Blow one end of the plastic hose inserted into the forming rod with hot air to make it reach the heat distortion temperature;

3) Fix the plastic hose into one end of the forming rod, and pull and stretch the other end, so that the heated end is stretched and thinned, and its inner wall is close to the forming rod;

4) After the stretching is completed, it is cooled in the natural environment, and the formed rod is taken out.

Further, the pulling force of pulling and stretching is 3-6 MPa. If the traction force is too large, the stretching will be uneven, if the traction force is too small, the stretching efficiency will be low, and if the stretching time is too long, the deformation will be reduced in the later stage, and the molding quality will be poor.

Further, the temperature of hot air blowing is 130-190° C., and the time is 2-4 minutes. Make the plastic hose reach a good deformation condition, and the molding quality is good.

Further, the shaped rod is made of metallic material. The forming rod is not deformed by heat, which ensures the size of the hose after deformation.

Beneficial effects of the present invention: Compared with the prior art, the variable diameter plastic hose of the present invention is made by stretching a plastic hose, and when it is used to pass cold water into the electrode arm, it is easy to install and use, and it is not easy to use during use. There will be a phenomenon that the two water pipes are separated to ensure the cooling effect of the electrode arm.

Description of drawings

FIG. 1 is a schematic structural diagram of an existing electrode arm using a casing structure cooling water pipe.

FIG. 2 is a schematic view of the structure of the electrode arm of the cooling water pipe adopting the tensile integrated structure of the present invention.

FIG. 3 is a schematic view of the structure of the variable diameter plastic hose of the present invention.

Detailed ways

In order to better understand the present invention, the content of the present invention is further illustrated below in conjunction with the embodiments, but the content of the present invention is not limited to the following embodiments.

Example 1

内径为

小径段32的外径为

内径为

Referring to FIG. 2 and FIG. 3 , the present embodiment provides a reduced diameter plastic hose 30 , and the reduced diameter plastic hose 30 is made of an equal diameter plastic hose by a thermal stretching process. The variable-diameter plastic hose 30 includes a large-diameter section 31 and a small-diameter section 32. The large-diameter section 31 has the same diameter as the pre-stretching hose, and the small-diameter section has a smaller diameter than the pre-stretching tube. For example, in this embodiment, the outer diameter of the large diameter section 31 is

The inner diameter is

The outer diameter of the small diameter section 32 is

The inner diameter is

冷却出水一端通道直径为

将变径软管30插入电极臂10的冷却通道，小径段32与电极臂的冷却出水一端通道适配，大径段31与电极臂进水一端冷却水通道适配。电极臂10的进冷却水的通道截为直径为

的圆；电极臂10的出冷却水的通道截面，焊接端为

的圆环，进冷却水端为

的圆环。一根变径软管即可匹配电极臂的冷却通道结构，保证冷却效果。The variable diameter plastic hose 30 is used for the cooling water pipe of the electrode arm 1. The diameter of the cooling water channel at the water inlet end of the electrode arm 10 is

The diameter of the channel at one end of the cooling water is

Insert the variable diameter hose 30 into the cooling channel of the electrode arm 10, the small diameter section 32 is adapted to the cooling water outlet channel of the electrode arm, and the large diameter section 31 is adapted to the cooling water channel of the water inlet end of the electrode arm. The passage of the electrode arm 10 into the cooling water is cut with a diameter of

circle; the channel section of the cooling water outlet of the electrode arm 10, the welding end is

The ring of , the cooling water end is

ring. A variable diameter hose can match the cooling channel structure of the electrode arm to ensure the cooling effect.

Example 2

This facility example provides a molding method for a variable diameter plastic hose as described in Embodiment 1, comprising the following steps:

的黄铜棒插入管径为

的PVC塑料软管的一端；1) Set the outer diameter to

The brass rod is inserted into the pipe with a diameter of

one end of the PVC plastic hose;

2) Blow the end of the plastic hose inserted into the forming rod with hot air at a temperature of 130-190°C for about 2-4 minutes, so that the heat deformation temperature of the PVC plastic hose is 80-100°C;

3) Fix the plastic hose into one end of the forming rod, and use manual traction and stretching at the other end to stretch and thin the heated end, and its inner wall is close to the forming rod;

4) After the stretching is completed, cool in the natural environment for 3-6 minutes, and take out the formed rod after setting.

The traction force of the above traction stretching is 3 to 6 MPa.

The above are only the preferred embodiments of the present invention. It should be pointed out that for those skilled in the art, without departing from the principles of the present invention, several improvements and modifications can be made. It should be regarded as the protection scope of the present invention.

Claims (7)

1. The diameter-variable plastic hose is characterized in that the diameter-variable plastic hose is made of an equal-diameter plastic hose by adopting a hot stretching process.

2. The reducing plastic hose coupling according to claim 1, wherein the reducing plastic hose comprises a large diameter section and a small diameter section, the diameter of the large diameter section is equal to that of the hose before stretching, and the diameter of the small diameter section is smaller than that of the hose before stretching.

3. The variable diameter plastic hose coupling according to claim 2, wherein the diameter of the large diameter section of the variable diameter plastic hose is equal to

The diameter of the small diameter section is

4. The method for forming the variable diameter plastic hose according to any one of claims 1 to 3, comprising the steps of:

1) inserting a forming rod with the outer diameter equal to the inner diameter of the reduced small-diameter section of pipe into one end of the plastic hose;

2) blowing one end of a plastic hose inserted into the forming rod by hot air to enable the plastic hose to reach the thermal deformation temperature;

3) inserting a fixed plastic hose into one end of the forming rod, and drawing and stretching the other end of the forming rod to enable the heated end to be drawn to be thin and enable the inner wall of the heated end to be tightly attached to the forming rod;

4) and cooling in a natural environment after the stretching is finished, and taking out the formed rod.

5. The molding method according to claim 4, wherein a traction force for the traction and stretching is 3 to 6 MPa.

6. The molding method according to claim 4, wherein the temperature of the hot air blowing is 130 to 190 ℃ and the time is 2 to 4 minutes.

7. The molding method according to claim 4, wherein the molding rod is made of a metal material.

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