阅读说明：本技术 一种瓦斯指示器弹簧管以及其制造方法 (Gas indicator spring tube and manufacturing method thereof ) 是由 张红军 于 2019-09-20 设计创作，主要内容包括：一种瓦斯指示器弹簧管以及其制造方法,涉及一种弹簧管,结构上包括管体,所述的管体呈弧形,其特征为,所述的管体一端设置有进气孔,所述的管体以进气孔为始从圆管状过渡到带状,所述的带状尾部既管体另一端密封,所述的带状尾部延伸有固定片,所述的固定片上设置有与连杆相配合的固定孔,所述的管体与所述的固定片一体。方法上包括六个步骤。与现有技术相比,本申请通过改进瓦斯指示器弹簧管的结构以及制造工艺,将现有需要人工生产的瓦斯指示器弹簧管改进为自动化生产,使得关键步骤生产速度从原本5s以上提高至1s至2s,使现有的良品率从90％以上提高到99％以上,材料成本下降10％以上,极大的增加了生产效率。(A gas indicator spring tube and a manufacturing method thereof relate to a spring tube which structurally comprises a tube body, wherein the tube body is arc-shaped, and the gas indicator spring tube is characterized in that an air inlet is formed in one end of the tube body, the tube body is in transition from a circular tube shape to a belt shape by taking the air inlet as an initial point, the other end of the tube body is sealed at the belt-shaped tail part, a fixing piece extends from the belt-shaped tail part, a fixing hole matched with a connecting rod is formed in the fixing piece, and the tube body and the fixing piece are integrated. The method comprises six steps. Compared with the prior art, this application is through improving the structure and the manufacturing process of gas indicator spring pipe, and the gas indicator spring pipe that will have now need manual production improves for automated production for key step production speed improves to 1s to 2s from original more than 5s, makes current yields improve to more than 99% from more than 90%, and material cost reduces more than 10%, very big increase production efficiency.)

1. A method of manufacturing a gas indicator spring tube, comprising the steps of:

step A: cutting the pipe, namely cutting the thin-wall hollow circular pipe into short pipes with equal length, and then conveying the short pipes to a feeding vibration disc;

and B: bending and molding, namely fixing one end of the short pipe, then bending the short pipe into an arc shape through a bending device, extruding the part of the short pipe except the fixed part in the bending process to form a belt shape, and transitioning the molded short pipe into a belt-shaped arc pipe in a circular pipe shape;

and C: cutting the strip-shaped tail part of the arc-shaped pipe to form a fixing sheet and a fixing hole in the fixing sheet;

step D: laser welding the banded tail of the arc-shaped pipe, wherein the laser-welded part is arranged above the fixing piece, and the banded tail of the arc-shaped pipe is sealed by the laser welding;

step E: detecting the shape of an air inlet hole at the circular tubular part of the arc-shaped pipe, wherein the detector is a detection head with a standard annular groove, if the air inlet hole can be inserted into the standard annular groove, the detection is passed, the next step is carried out, and if the air inlet hole cannot be discarded;

step F: the arc-shaped pipe is subjected to sealing detection, the air inlet is connected into an air source, if the air source continuously supplies air, leakage is indicated, and the arc-shaped pipe is abandoned.

2. The method as claimed in claim 1, wherein the wall thickness of the thin-walled hollow circular tube in step A is 0.1mm to 0.5mm, the diameter of the thin-walled hollow circular tube is 1mm to 5mm, and the length of the short tube is 4cm to 8 cm.

3. The method of claim 1 wherein in step C, a twist is further cut into the anchor plate, the twist being adapted to provide a 90 degree angle between the anchor plate and the ribbon tail of the arced tube.

4. The method of claim 1, wherein in step C, the order of step C and step D is changed to another order by laser cutting, i.e. the strip-shaped tail of the arc tube is laser welded and then a fixing piece is cut out from the strip-shaped tail of the arc tube; if the cutting is stamping, the sequence of the step C and the step D can not be interchanged.

5. The method of claim 1 wherein the arcuate tube is placed in water for a leak test in step F, and if there is a leak, bubbles are generated in the water and the specific leak point is known.

6. A method of manufacturing a gas indicator spring tube according to claim 1, wherein the tube is made of metal or a metal alloy, preferably copper or a copper alloy.

7. The method of claim 1 wherein in step B, the ratio of the tubular to ribbon length of the contoured arcuate tube is in the range of 1: 5 to 1: 8.

8. A spring tube manufactured according to the manufacturing method of the gas indicator spring tube of claim 1, comprising a tube body, wherein the tube body is arc-shaped, characterized in that an air inlet hole is arranged at one end of the tube body, the tube body is transited from a circular tube shape to a belt shape by taking the air inlet hole as the starting point, the other end of the tube body is sealed by the belt-shaped tail part, a fixing piece extends from the belt-shaped tail part, a fixing hole matched with the connecting rod is arranged on the fixing piece, and the tube body and the fixing piece are integrated.

9. A spring tube as set forth in claim 8 wherein said ribbon tail has a torsion portion between said stator and said body, said stator and said torsion portion being integral.

10. A gas indicator, characterized in that a spring tube as disclosed in claim 8 is applied.

Technical Field

The invention relates to a spring tube, in particular to a spring tube for a gas indicator.

Background

The pressure gauge is a meter which takes an elastic element as a sensitive element and measures and indicates the pressure higher than the ambient pressure, is very commonly applied and almost extends to all the fields of industrial processes and scientific researches. The method is widely available in the fields of heating power pipe networks, oil and gas transmission, water and gas supply systems, vehicle maintenance plants and shops and the like. Especially in the industrial process control and technical measurement process, the mechanical pressure gauge is more and more widely applied due to the characteristics of high mechanical strength, convenient production and the like of the elastic sensitive element of the mechanical pressure gauge. The pressure gauge is based on the principle that the pressure is displayed by the rotation of a pointer as the pressure deformation is transmitted to the pointer by a conversion mechanism of a movement in the gauge through the elastic deformation of a sensitive element in the gauge.

For a simple gas indicator with low use precision, the sensing element can be a copper spring tube which is a thin-wall bent copper tube with an opening at one end and a closed end at the other end, when fluid media are filled into the spring tube, the bending degree and the position of the spring tube can be changed according to the position of the fluid media in the spring tube, and then the pressure of the fluid media can be known through the transformation of deformation. The spring tube is a precise component, has certain requirements on the shape of the spring tube, is a thin-wall hollow tube with one conical end and then is converted into a flat strip shape, and is sealed at the tail part of the strip shape and connected with a pointer. The tail sealing of the existing spring tube is realized by inserting a separate sealing head into the tail of the spring tube and then welding and sealing the sealing head, wherein the sealing head is connected with a pointer through a connecting rod (as shown in fig. 1 and 2, an air inlet hole 101, a tail part 102 and a sealing head 103). Because the structure and the tail sealing treatment process of spring pipe itself for the manufacturing of spring pipe still is accomplished by the manual work, and can't use the machine to replace, and little spring pipe width is less than 5 millimeters, and thickness is less than 1 millimeter, carries out welded seal on so narrow and small spring pipe, and the brazing filler metal influences the precision too much, and the brazing filler metal is too few easily to leak the welding, makes the disability rate in the spring pipe production process high or not. If an automatic production process is adopted, the rejection rate of the spring tube can be greatly reduced by using standard parameters, but the structure and the specific production process of the spring tube need to be improved.

Disclosure of Invention

Aiming at the defects in the prior art, the invention provides a spring tube of a gas indicator and a manufacturing method of the spring tube of the gas indicator, and the spring tube of the gas indicator which needs manual production is improved into automatic production by improving the structure and the manufacturing process of the spring tube of the gas indicator, so that the production speed of key steps is improved from more than 5s originally to 1s to 2s, the existing yield is improved from more than 90 percent to more than 99 percent, the material cost is reduced by more than 10 percent, and the production efficiency is greatly improved.

In order to solve the technical problem, the invention is solved by the following technical scheme: a manufacturing method of a gas indicator spring tube comprises the following steps: step A: cutting the pipe, namely cutting the thin-wall hollow circular pipe into short pipes with equal length, and then conveying the short pipes to a feeding vibration disc; and B: bending and molding, namely fixing one end of the short pipe, then bending the short pipe into an arc shape through a bending device, extruding the part of the short pipe except the fixed part in the bending process to form a belt shape, and transitioning the molded short pipe into a belt-shaped arc pipe in a circular pipe shape; and C: cutting the strip-shaped tail part of the arc-shaped pipe to form a fixing sheet and a fixing hole in the fixing sheet; step D: laser welding the banded tail of the arc-shaped pipe, wherein the laser-welded part is arranged above the fixing piece, and the banded tail of the arc-shaped pipe is sealed by the laser welding; step E: detecting the shape of an air inlet hole at the circular tubular part of the arc-shaped pipe, wherein the detector is a detection head with a standard annular groove, if the air inlet hole can be inserted into the standard annular groove, the detection is passed, the next step is carried out, and if the air inlet hole cannot be discarded; step F: the arc-shaped pipe is subjected to sealing detection, the air inlet is connected into an air source, if the air source continuously supplies air, leakage is indicated, and the arc-shaped pipe is abandoned.

In the above technical solution, preferably, in step a, the wall thickness of the thin-walled hollow circular tube is between 0.1mm and 0.5mm, the tube diameter of the thin-walled hollow circular tube is between 1mm and 5mm, and the length of the short tube is between 4cm and 8 cm.

In the above technical solution, preferably, in the step C, a torsion portion is further cut on the fixing piece, and an included angle between the fixing piece and the ribbon-shaped tail portion of the arc tube can be 90 degrees by the torsion portion.

In the above technical solution, preferably, in the step C, how to adopt the laser cutting mode, the order of the step C and the step D may be exchanged in sequence, that is, the fixing piece may be cut out by laser welding the strip-shaped tail of the arc tube and then cutting the strip-shaped tail of the arc tube; if the cutting is stamping, the sequence of the step C and the step D can not be interchanged.

In the above technical solution, preferably, in step F, the arc-shaped pipe may be placed in water for sealing detection, and if there is a leakage, bubbles may be generated in the water, and a specific leakage point may be known.

In the above technical solution, preferably, the tube is made of metal or metal alloy, and preferably, copper or copper alloy is selected.

In the above technical solution, preferably, in step B, the length ratio of the circular tube shape to the belt shape of the molded arc-shaped pipe is in the range of 1: 5 to 1: 8.

The utility model provides a spring tube, includes the body, the body be the arc, body one end be provided with the inlet port, the body use the inlet port as starting to transition to banded from the pipe form, banded afterbody both the body other end sealed, banded afterbody extend and have the stationary blade, the stationary blade on be provided with connecting rod matched with fixed orifices, the body with the stationary blade integrative.

In the above-described aspect, preferably, a twisted portion is provided between the band-shaped tail portion and the fixing piece, and the pipe body, the fixing piece, and the twisted portion are integrated.

A gas indicator is provided with the spring tube disclosed by the application.

The core of this application is to improve into integral type structure with spring tube seal head tin welding formula originally, and in seal head welded type structure, the sealed mode that can only pass through artifical tin soldering of seal head and area pipe afterbody had both plugged up the gap of seal head and area pipe afterbody through the solder. The sealing head is omitted in the application, the original belt pipe is prolonged, the tail part of the belt pipe is divided into a sealing area and a fixing sheet, and the function of the sealing head is respectively completed by the sealing area and the fixing sheet. The spring tube is integrated by the arrangement, and the cutting and welding processes can be directly carried out on the spring tube. The laser welding can be directly used in a sealing area during welding, the upper piece and the lower piece of the belt pipe are sealed through hot melting, so that the influence of welding flux on precision is directly avoided, the sealing effect is better, the fixing piece can be directly cut and formed, if the laser cutting is used, the cutting step and the welding step can be exchanged successively, if the stamping cutting step is adopted, the cutting step and the welding step can be carried out firstly, and the welding step can be carried out only in 2s-1s in a short time because the welding step and the cutting step are completed in 2s-1s, and the welding effect can be influenced by force generated in the stamping.

The integrated structure eliminates the process of inserting the welding type sealing head, so that automation is possible, and the spring tube can be changed from raw materials to finished products on a working table. The production process can be provided with a rotary workbench, the workbench is provided with a plurality of stations, the stations can comprise feeding, molding, welding, cutting, appearance detection, pressure detection, qualified product discharge, defective product discharge and the like, the whole process does not need manual operation any more, and the whole process can be completed by mechanical automation.

Compared with the prior art, this application is through improving the structure and the manufacturing process of gas indicator spring pipe, and the gas indicator spring pipe that will have now need manual production improves for automated production for key step production speed improves to 1s to 2s from original more than 5s, makes current yields improve to more than 99% from more than 90%, and material cost reduces more than 10%, very big increase production efficiency.

Drawings

Fig. 1 is a front view of a conventional bourdon tube.

Fig. 2 is a side view of a conventional spring tube.

Fig. 3 is a front view of the spring tube of the present invention.

Fig. 4 is a side view of the spring tube of the present invention.

FIG. 5 is a schematic view of a gas indicator according to the present invention.

Detailed Description

The present invention will be described in further detail below with reference to specific embodiments and the attached drawings.