A pipe end forming online detection device and a pipe end forming online detection method

Abstract

The present invention relates to an online detection device for pipe end forming and an online detection method for pipe end forming. The device includes an air source and an air valve. The air valve is used to open and close the air source. It also includes a punch for detecting cracking of pipe fittings and a pipeline connecting the air valve and the punch. The punch is installed in a punch die seat of a pipe end forming machine. The punch is a hollow structure. The top of the hollow structure of the punch is connected to the pipeline. A plurality of annular grooves are arranged on the outer circumference of the punch. The annular grooves are connected to the hollow structure of the punch through holes. The present invention is used for a pipe end forming machine. The punch is installed in the punch seat of a machine tool. When the punch performs a forming process on the pipe fitting, leak detection can be performed at the same time. The leak detection is performed synchronously and integrated with the forming process. The process of separately going on a leak detection line for leak detection is eliminated, labor and process costs are saved, and the production cycle is greatly increased.

Description

Technical Field

[0001] The invention relates to the field of pipe end forming machines, and in particular to an online detection device and method for pipe end forming. Background Art

[0002] All fluid pipes must go through a leak detection process after the pipe end is formed. This process requires special tooling and special leak detection equipment. The pipe fittings after the pipe end is formed must also go through this process, which affects the overall production efficiency and invisibly increases labor costs and time costs. Summary of the invention

[0003] In view of the problems in the prior art, the present invention provides an online detection device and an online detection method for pipe end forming.

[0004] To solve the above problems, the solution of the present invention is an online detection device for pipe end forming, including an air source and an air valve, the air valve is used to open and close the air source, and also includes a punch for detecting cracking of pipe fittings and a pipeline connecting the air valve and the punch. The punch is installed in a punch die seat of a pipe end forming machine. The punch is a hollow structure. The top of the hollow structure of the punch is connected to the pipeline. A plurality of annular grooves are arranged on the outer circumference of the punch, and the annular grooves are connected to the hollow structure of the punch through holes.

[0005] As a further improvement, it also includes an electronic digital pressure switch. An electronic digital pressure switch is arranged on the pipeline, and the other end of the pipeline is connected to a gas valve. The electronic digital pressure switch is used to detect the gas pressure in the pipeline.

[0006] As a further improvement, the output point of the electronic digital pressure switch is connected to a programmable controller.

[0007] As a further improvement, the top end of the hollow structure of the male mold is connected to the pipeline through a pipe joint.

[0008] As a further improvement, a sealing pipe thread is provided at the root of the punch.

[0009] A method for detecting tube end forming online, using the above-mentioned tube end forming online detection device, comprising:

[0010] Step 1: insert the punch into the pipe fitting to expand the pipe;

[0011] Step 2: If there is no cracking after the pipe fitting is formed, the pipe fitting and the punch are in a tight fit. The programmable controller controls the air valve to open the air source, and inflates the punch and the entire air circuit through the pipeline. After the inflation is completed, the programmable controller controls the air valve to close, and the entire air circuit is in a pressure-maintaining state. The electronic digital pressure switch is set with a minimum pressure value for detection. The minimum pressure value is the standard pressure value obtained after multiple tests of a standard intact molded pipe fitting.

[0012] Step 3: If the electronic digital pressure switch detects that the pressure value of the entire gas path is lower than the minimum pressure value, the pipe is judged to be in a cracked state;

[0013] Step 4: The electronic digital pressure switch outputs a signal to the programmable controller. After receiving the signal, the system gives an alarm signal;

[0014] Step 5: Take out the pipe and place it in the waste bin.

[0015] It can be seen from the above description that the present invention has the following advantages:

[0016] After adopting this device, the cracking condition of the pipe fittings can be detected during the molding process, which saves process costs and eliminates the need for subsequent inspection processes.

[0017] This device is used in the tube end forming machine. The punch is installed in the punch seat of the machine tool. When the punch is forming the tube, the leak detection can be carried out at the same time. It is carried out synchronously and integrated with the forming process. It eliminates the process of separately testing the leak on the leak detection line, saves labor and process costs, and greatly increases the production cycle. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the structure of the present invention;

[0019] Figure 2 It is a structural schematic diagram of the male mold of the present invention;

[0020] Figure numerals: 1. pipe fitting, 2. punch, 3. pipeline, 4. electronic digital pressure switch, 5. programmable controller, 6. air source, 7. air valve, 21. top of the hollow structure of the punch, 22. annular groove, 23. hole, 24. root of the punch. DETAILED DESCRIPTION

[0021] Combination Figure 1 and Figure 2 , describes in detail the first specific embodiment of the present invention, but does not limit the claims of the present invention.

[0022] like Figure 1 and Figure 2As shown, an online detection device for pipe end forming includes an air source 6 and an air valve 7, wherein the air valve 7 is used to open and close the air source 6, and also includes a punch 2 for detecting cracking of pipe fittings and a pipeline 3 connecting the air valve 7 and the punch 2. The punch 2 is installed in a punch die seat of a pipe end forming machine, and the punch 2 is a hollow structure. The top 21 of the hollow structure of the punch 2 is connected to the pipeline 3. A plurality of annular grooves 22 are arranged on the outer circumference of the punch 2, and the annular grooves are connected to the hollow structure of the punch 2 through holes 23.

[0023] More specifically, it also includes an electronic digital pressure switch 4 . An electronic digital pressure switch 4 is provided on the pipeline 3 . The other end of the pipeline 3 is connected to a gas valve. The electronic digital pressure switch 4 is used to detect the gas pressure in the pipeline 3 .

[0024] More specifically, the output point of the electronic digital pressure switch 4 is connected to the programmable controller 5 .

[0025] More specifically, the top end 21 of the hollow structure of the male mold 2 is connected to the pipeline 3 through a pipe joint.

[0026] More specifically, the root 24 of the male die 2 is provided with a sealing pipe thread.

[0027] A method for detecting tube end forming online, using the above-mentioned tube end forming online detection device, comprising:

[0028] Step 1: The punch 2 is inserted into the pipe 1 to expand the pipe;

[0029] Step 2: If there is no cracking on the pipe fitting 1 after forming, the pipe fitting 1 and the punch 2 are in a tight fit. The programmable controller 5 controls the air valve 7 to open the air source 6, and inflates the punch 2 and the entire air circuit through the pipeline 3. After the inflation is completed, the programmable controller 5 controls the air valve 7 to close, and the entire air circuit is in a pressure-maintaining state. The electronic digital pressure switch 4 is set with a minimum pressure value for detection, which is a standard pressure value obtained after multiple tests of a standard intact formed pipe fitting.

[0030] Step 3: If the electronic digital pressure switch 4 detects that the pressure value of the entire gas path is lower than the minimum pressure value, the pipe 1 is determined to be in a cracked state;

[0031] Step 4: The electronic digital pressure switch 4 outputs a signal to the programmable controller 5. After receiving the signal, the system gives an alarm signal;

[0032] Step 5: Take out the pipe 1 and place it in a waste bin.

[0033] When in use, the raw material pipe fitting 1 is placed in a clamping die (not shown in the figure of the present invention), the punch 2 is installed in the punch mounting seat of the pipe end forming machine (the punch mounting seat is not shown in the figure of the present invention), and the electronic digital pressure switch 4 and the air valve 7 and the air source 6 are connected through the pipeline 3 (a hose can be used as a pipeline in specific use), and it is ensured that there is no leakage at the joint, the signal point of the electronic digital pressure switch 4 is connected to the input end of the programmable controller 5 through a cable, and the control line of the air valve 7 is connected to the output end of the programmable controller 5 by a cable.

[0034] The working process of the present invention is as follows: after the whole device is integrated and installed with the tube end forming machine, when the punch 2 is inserted into the pipe fitting 1 for tube expansion, if the pipe fitting 1 is not cracked after forming, then it is in a tightly fitting state with the punch 2, and the programmable controller 5 controls the air valve 7 to open, and the entire air circuit is inflated through the pipeline 3. After the inflation is completed, the programmable controller 5 controls the air valve 7 to close, and the entire air circuit is in a pressure-maintaining state. The electronic digital pressure switch 4 is set with a minimum pressure for detection. Below this pressure, the pipe 1 is judged to be in a cracked state. At this time, the electronic digital pressure switch 4 outputs a signal to the programmable controller 5. After receiving the signal, the system gives an alarm signal, or takes out the pipe fitting through other mechanisms and places it in a waste bin. This device saves a separate leak detection process, saves costs, and increases efficiency.

[0035] In summary, after adopting this device, the cracking condition of the pipe fittings can be detected during the molding process, which saves process costs and eliminates the need for subsequent inspection processes.

[0036] This device is used in the tube end forming machine. The punch is installed in the punch seat of the machine tool. When the punch is forming the tube, the leak detection can be carried out at the same time. It is carried out synchronously and integrated with the forming process. It eliminates the process of separately testing the leak on the leak detection line, saves labor and process costs, and greatly increases the production cycle.

[0037] It can be understood that the above specific description of the present invention is only used to illustrate the present invention and is not limited to the technical solutions described in the embodiments of the present invention. Those skilled in the art should understand that the present invention can be modified or replaced by equivalents to achieve the same technical effects without departing from the spirit and scope defined by the claims, but all are within the protection scope of the present invention.

Claims

1. An online detection device for tube end forming, comprising an air source (6) and an air valve (7), wherein the air valve (7) is used to open and close the air source (6), and is characterized in that: It also comprises a punch (2) for detecting cracking of the pipe fitting and a pipeline (3) connecting the air valve (7) and the punch (2), wherein the punch (2) is installed in a punch die seat of a pipe end forming machine, the punch (2) is a hollow structure, the top end (21) of the hollow structure of the punch (2) is connected to the pipeline (3), and a plurality of annular grooves (22) are arranged on the outer circumference of the punch (2), and the annular grooves are connected to the hollow structure of the punch (2) through holes (23); It also comprises an electronic digital pressure switch (4), wherein the pipeline (3) is provided with an electronic digital pressure switch (4), and the other end of the pipeline (3) is connected to a gas valve, and the electronic digital pressure switch (4) is used to detect the gas pressure in the pipeline (3).

2. The tube end forming online detection device according to claim 1 is characterized in that: It also includes a programmable controller (5), and the output point of the electronic digital pressure switch (4) is connected to the programmable controller (5).

3. The tube end forming online detection device according to claim 1 is characterized in that: The top end (21) of the hollow structure of the male mold (2) is connected to the pipeline (3) via a pipe joint.

4. The tube end forming online detection device according to claim 1, characterized in that: The root (24) of the male die (2) is provided with a sealing pipe thread.

5. A method for online detection of pipe end forming, characterized in that: The pipe end forming online detection device according to any one of claims 2 to 4 comprises: Step 1: The punch (2) is inserted into the pipe (1) to expand the pipe; Step 2: If the pipe fitting (1) has no cracks after forming, the pipe fitting (1) and the punch (2) are in a tightly fitted state. The programmable controller (5) controls the air valve (7) to open the air source (6), and the punch (2) and the entire air path are inflated through the pipeline (3). After the inflation is completed, the programmable controller (5) controls the air valve (7) to close, and the entire air path is in a pressure-maintaining state. The electronic digital pressure switch (4) is set with a minimum pressure value for detection, and the minimum pressure value is a standard pressure value obtained after multiple tests of a standard intact formed pipe fitting. Step 3: If the electronic digital pressure switch (4) detects that the pressure value of the entire gas path is lower than the minimum pressure value, the pipe (1) is determined to be in a cracked state; Step 4: The electronic digital pressure switch (4) outputs a signal to the programmable controller (5). After receiving the signal, the system gives an alarm signal; Step 5: Take out the pipe (1) and place it in a waste bin.

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