A marking machine gas leak detection device

Abstract

This utility model discloses a gas leak detection device for a marking machine, relating to the field of marking machine technology. It includes a pneumatic marking machine and a gas leak detection component mounted on the machine. The component comprises a three-way pipe fixedly mounted on the pneumatic control box of the machine. The lower port of the three-way pipe is connected to the input end of the control box, and a quick-connect fitting is threaded onto the upper port. A screw cylinder is threaded onto the outer side of the upper port. This gas leak detection device, through the cooperation of a ring piston and a pressure sensor, can detect changes in air pressure at the moment of leakage at the pipe connection, achieving real-time leak monitoring and automatic alarm via the control system, facilitating timely problem detection by staff. Furthermore, the high-pressure gas generated by the compression of the internal chamber during leakage drives the expansion of the ring-shaped airbag, quickly sealing the leak point and preventing continuous gas leakage from causing equipment shutdown, thus ensuring the continuity of marking operations.

Description

Technical Field

[0001] This utility model relates to the field of marking machine technology, specifically to a gas leak detection device for a marking machine. Background Technology

[0002] Marking machines are specialized equipment used in industrial production to mark information (such as model, serial number, production date, etc.) on the surface of parts and products. According to the driving method, they can be divided into pneumatic, laser, electrochemical and other types. The core operation of pneumatic marking machines relies on compressed air: the external air source is processed by the air source triplet (to achieve filtration, pressure regulation and lubrication), and then connected to the pneumatic control box through the air pipe. The solenoid valve in the pneumatic control box controls the air flow and drives the marking needle to perform high-frequency impact motion to complete the marking. In order to facilitate equipment debugging, model change or maintenance, quick-connect couplings are generally used to connect the air pipe to the pneumatic control box / air source triplet to achieve quick insertion and removal of the air pipe. Since the workpiece fixture needs to be changed frequently and the marking position needs to be adjusted during the production process, the insertion and removal operation of the air pipe and quick-connect coupling is frequent, which makes the sealing rubber ring of the quick-connect coupling easy to wear and the inner wall of the coupling easy to deform, becoming the main leakage point of the air source passage.

[0003] Therefore, it is necessary to propose a gas leak detection device for marking machines to solve the above problems. Utility Model Content

[0004] Technical problem to be solved: The purpose of this utility model is to provide a gas leak detection device for a marking machine, so as to solve the problem mentioned in the background art that the existing pneumatic marking machine has frequent workpiece fixture changes and marking station adjustments during the production process, and the frequent insertion and removal operations of the air pipe and quick connector, which leads to easy wear of the sealing rubber ring of the quick connector and easy deformation of the inner wall of the connector, becoming the main leakage point of the air source passage.

[0005] Technical Solution: To achieve the above objectives, this utility model provides the following technical solution: A gas leak detection device for a marking machine, comprising a pneumatic marking machine and a gas leak detection component mounted on the pneumatic marking machine. The gas leak detection component includes a three-way pipe fixedly mounted on the pneumatic control box of the pneumatic marking machine. The lower port of the three-way pipe is connected to the input end of the pneumatic control box, and a quick-connect fitting is threaded onto the upper port. A screw cylinder is threaded onto the outer side of the upper port of the three-way pipe, and an annular air bladder is fixedly mounted on the inner side of the upper end of the screw cylinder. A ring platform is fixedly mounted inside the branch port of the three-way pipe, and a slide cylinder is fixedly mounted inside the ring platform. A ring piston is slidably mounted along the axial direction, dividing the branch port of the three-way pipe into inner and outer chambers. An exhaust pipe communicating with the inner chamber is fixedly installed on the side wall of the inner chamber. A pressure sensor is fixedly installed inside the exhaust pipe and is connected to the control system of the pneumatic marking machine. A connecting pipe is threaded to the output end of the exhaust pipe, and a one-way valve is installed inside the connecting pipe. The other end of the connecting pipe is connected to the ring airbag. A sleeve is concentrically fixedly installed on the outer end face of the ring piston. The outer end of the sleeve is sealed, and a spring is fitted on the outside of the sleeve. A cover plate is bolted to the end of the branch port of the three-way pipe, and a vent hole is opened in the middle of the cover plate.

[0006] Preferably, one side of the screw barrel has a through hole communicating with the interior of the annular airbag, and both ends of the connecting pipe are provided with threaded joints, and both ends of the connecting pipe are threadedly connected to the through hole and the exhaust pipe respectively through the threaded joints.

[0007] Preferably, the outer ring surface of the ring platform is welded to the inner wall of the branch port of the tee pipe, the inner diameter of the sleeve is larger than the outer diameter of the slide cylinder, and the inner diameter of the vent hole of the cover plate is smaller than the outer diameter of the sleeve.

[0008] Beneficial effects: Compared with the prior art, this utility model provides a gas leak detection device for a marking machine. This gas leak detection device has a unique structure and is easy to use. On the one hand, through the cooperation of the annular piston and the pressure sensor, the gas pressure change can be detected at the moment of leakage at the gas pipe connection, realizing real-time monitoring of leakage and automatic alarm through the control system, which makes it easy for staff to discover problems in time. On the other hand, the high-pressure gas generated by the compression of the inner chamber when leaking drives the annular airbag to expand, realizing the rapid sealing of the leak point, avoiding continuous gas leakage that would cause equipment shutdown, and ensuring the continuity of marking operations. Attached Figure Description

[0009] Figure 1 This is a three-dimensional schematic diagram of the structure of this utility model; Figure 2 This utility model Figure 1 Enlarged schematic diagram of the structure in area A; Figure 3 This is a three-dimensional schematic diagram of the gas leak detection component of this utility model; Figure 4 This is a cross-sectional schematic diagram of the gas leak detection component of this utility model; Figure 5 This is a 3D schematic diagram of an existing pneumatic marking machine.

[0010] In the diagram: 1. Pneumatic marking machine; 2. Gas leak detection assembly; 21. T-connector; 22. Quick-connect fitting; 23. Ring platform; 24. Screw barrel; 25. Annular airbag; 26. Cover plate; 27. Slide cylinder; 28. Annular piston; 29. ​​Sleeve; 210. Spring; 211. Exhaust pipe; 212. Connecting pipe; 213. Pressure sensor. Detailed Implementation

[0011] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0012] Example 1: This example provides a gas leak detection device for a marking machine. It is a direct improvement on an existing marking machine and has a unique structure. Please refer to [link / reference]. Figure 1-5 As shown, the device includes a pneumatic marking machine 1 and a gas leak detection assembly 2 installed on the pneumatic marking machine 1. The gas leak detection assembly 2 includes a three-way pipe 21, which is fixedly installed on the pneumatic control box of the pneumatic marking machine 1 by bolts. Its three ports are the lower port, the upper port and the branch port, and the three ports are interconnected to form a three-way path for gas flow.

[0013] The lower port of the three-way pipe 21 is connected to the input end of the pneumatic control box, used to introduce an external air source into the pneumatic control box to provide power for the marking action of the pneumatic marking machine 1; the inner wall of the upper port of the three-way pipe 21 is provided with internal threads for threaded fitting of the quick-connect fitting 22; the quick-connect fitting 22 is a standard pneumatic fitting, used for quick insertion with the air pipe of the external air source (usually connected to the output end of the air source triplet), realizing quick connection of the air source; at the same time, the outer wall of the upper port is provided with external threads for... The screw sleeve 24 is a cylindrical structure with two through ends. An annular air bladder 25 is fixedly fitted on the inner side of its upper end with glue. The inner ring surface of the annular air bladder 25 is set to correspond to the outer wall of the air tube to which the quick-connect connector 22 is inserted. In the initial state, the annular air bladder 25 is not inflated, and its inner ring diameter is slightly larger than the outer diameter of the air tube, which does not affect the normal insertion and removal of the air tube. When the annular air bladder 25 is inflated, its inner ring surface can tightly fit the outer wall of the air tube, thereby sealing the gap between the screw sleeve 24 and the air tube.

[0014] The branch port of the tee pipe 21 is internally fitted with an annular platform 23. The outer annular surface of the annular platform 23 is welded to the inner wall of the branch port to ensure a tight connection. A sliding cylinder 27 is welded to the center hole of the annular platform 23. The sliding cylinder 27 is a tubular structure with both ends open, and its axis coincides with the axis of the branch port. An annular piston 28 is axially slidably fitted on the outer side of the sliding cylinder 27. The outer wall of the annular piston 28 slides and seals with the inner wall of the branch port (the sealing can be enhanced by setting an O-ring seal), thereby dividing the branch port into an inner chamber and an outer chamber. The inner chamber is the space between the annular piston 28 and the annular platform 23, and the outer chamber is the space between the annular piston 28 and the end of the branch port.

[0015] An exhaust pipe 211, which communicates with the interior, is welded to the side wall of the inner chamber. A pressure sensor 213 is fixedly installed inside the exhaust pipe 211 by a bracket. The detection end of the pressure sensor 213 faces the inner chamber and is used to detect changes in the air pressure of the inner chamber in real time. The pressure sensor 213 is electrically connected to the control system (such as a PLC controller) of the pneumatic marking machine 1 through a wire, and can transmit the detected pressure signal to the control system. The output end of the exhaust pipe 211 is threadedly connected to a connecting pipe 212, which is a flexible pressure-resistant pipe (such as a PU pipe). It has a one-way valve (not shown in the figure) connected in series inside. The one-way valve is directed from the exhaust pipe 211 to the annular airbag 25 to prevent the gas in the annular airbag 25 from flowing back to the exhaust pipe 211. The other end of the connecting pipe 212 is connected to the annular airbag 25. Specifically, a through hole is opened on one side of the screw cylinder 24 to communicate with the inside of the annular airbag 25. Both ends of the connecting pipe 212 are provided with internal threaded connectors, which are sealed to the through hole and the output end of the exhaust pipe 211 respectively through threaded engagement, so as to realize the air passage connection between the inner cavity and the annular airbag 25.

[0016] A sleeve 29 is concentrically welded to the outer end face of the annular piston 28. The sleeve 29 is a tubular structure with one end sealed, and its sealed end faces the outside of the branch port. The inner diameter of the sleeve 29 is larger than the outer diameter of the slide cylinder 27 to ensure that the sleeve 29 does not interfere with the slide cylinder 27 when it moves with the annular piston 28. A spring 210 is fitted on the outside of the sleeve 29. One end of the spring 210 abuts against the outer end face of the annular piston 28, and the other end abuts against the cover plate 26 at the end of the branch port. The cover plate 26 is fixedly connected to the end of the branch port by bolts. A vent hole is opened in the middle of the cover plate 26. The inner diameter of the vent hole is smaller than the outer diameter of the sleeve 29 (to prevent the sleeve 29 from coming out of the vent hole). This is used to balance the air pressure between the outer chamber and the outside atmosphere to ensure that the annular piston 28 can slide freely.

[0017] Working principle: When the operator uses the pneumatic marking machine 1 for marking operations, first connect one end of the air pipe of the external air source to the output end of the air source triplet, and insert the other end into the quick connector 22 to complete the connection between the air source and the pneumatic marking machine 1; in the initial state, the air source enters the pneumatic control box through the upper and lower ports of the three-way pipe 21. At this time, the inside of the three-way pipe 21 (including the inner chamber of the branch port) is filled with air source pressure (usually 0.4-0.6MPa); the annular piston 28 is kept in balance under the action of the air source pressure (inner chamber air pressure) and the elastic force of the spring 210. At this time, the outer wall of the slide cylinder 27 and the inner wall of the annular piston 28 partially overlap, the inner chamber volume is in the initial state, the pressure sensor 213 detects the initial pressure and transmits it to the control system, and the system determines that it is in a normal state.

[0018] When the connection between the air tube and the quick-connect fitting 22 becomes worn or loose due to repeated insertion and removal, causing air leakage, the air pressure inside the three-way tube 21 will drop rapidly. At this time, the force of the air source pressure on the annular piston 28 decreases, and the spring 210 pushes the annular piston 28 to move inward (towards the ring platform 23) under its own elastic force, resulting in the compression of the inner chamber volume and the increase of the air pressure in the inner chamber. The pressure sensor 213 detects the sudden increase in the air pressure in the inner chamber in real time (the difference from the initial pressure exceeds a preset threshold, such as 0.1MPa), and immediately transmits the pressure change signal to the control system of the pneumatic marking machine 1. After receiving the signal, the control system issues an alarm through a buzzer or warning light to remind the staff that there is an air leak at the connection.

[0019] Meanwhile, the high-pressure gas generated by the volume compression of the inner chamber enters the annular airbag 25 through the exhaust pipe 211 and the connecting pipe 212 (with a one-way valve), causing the annular airbag 25 to expand rapidly. After expansion, the inner ring of the annular airbag 25 tightly fits against the outer wall of the air pipe, completely sealing the gap between the screw cylinder 24 and the air pipe, preventing gas from continuing to leak from the connection, ensuring that the pneumatic control box of the pneumatic marking machine 1 can still obtain sufficient air pressure, ensuring that the marking operation can continue and avoiding the impact of machine stoppage on work progress. After the marking operation is completed, the operator can turn off the air source, replace the new quick-connect connector 22 or repair the air pipe connection. The gas in the annular airbag 25 can be manually discharged by pressing, and the device returns to its initial state, ready for the next use.

[0020] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A gas leak detection device for a marking machine, comprising a pneumatic marking machine (1), characterized in that: It also includes a gas leak detection assembly (2) installed on the pneumatic marking machine (1). The gas leak detection assembly (2) includes a three-way pipe (21) fixedly installed on the pneumatic control box of the pneumatic marking machine (1). The lower port of the three-way pipe (21) is connected to the input end of the pneumatic control box. A quick-connect fitting (22) is threaded on the upper port. A screw cylinder (24) is threaded on the outer side of the upper port of the three-way pipe (21). An annular air bladder (25) is fixedly fitted on the inner side of the upper end of the screw cylinder (24). An annular platform (23) is fixedly fitted on the branch port of the three-way pipe (21). A slide cylinder (27) is fixedly fitted on the annular platform (23). An annular piston (28) is axially slidably fitted on the outer side of the slide cylinder (27). The annular piston (28) separates the branch ports of the three-way pipe (21). It consists of two chambers, an inner and an outer chamber. An exhaust pipe (211) communicating with the inner chamber is fixedly installed on the side wall of the inner chamber. A pressure sensor (213) is fixedly installed inside the exhaust pipe (211). The pressure sensor (213) is connected to the control system of the pneumatic marking machine (1). A connecting pipe (212) is threadedly connected to the output end of the exhaust pipe (211). A one-way valve is provided inside the connecting pipe (212). The other end of the connecting pipe (212) is connected to the annular airbag (25). A sleeve (29) is concentrically fixedly installed on the outer end face of the annular piston (28). The outer end of the sleeve (29) is sealed. A spring (210) is sleeved on the outer side of the sleeve (29). A cover plate (26) is bolted to the end of the branch port of the three-way pipe (21). A vent hole is opened in the middle of the cover plate (26).

2. The gas leak detection device for a marking machine according to claim 1, characterized in that: The screw barrel (24) has a through hole on one side that communicates with the inside of the annular airbag (25). Both ends of the connecting pipe (212) are provided with threaded joints, and both ends of the connecting pipe (212) are threadedly connected to the through hole and the exhaust pipe (211) respectively through the threaded joints.

3. The gas leak detection device for a marking machine according to claim 1, characterized in that: The outer ring surface of the ring platform (23) is welded to the inner wall of the branch port of the three-way pipe (21). The inner diameter of the sleeve (29) is larger than the outer diameter of the slide cylinder (27), and the inner diameter of the vent hole of the cover plate (26) is smaller than the outer diameter of the sleeve (29).

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