Mechanism for rapidly switching air injection cleaning modes of suction type sand blasting gun

Abstract

The invention discloses a mechanism for rapidly switching a suction type sand blasting gun from a sand blasting mode to an air injection cleaning mode. The sand blasting mode and the air injection cleaning mode are rapidly switched on the sand blasting gun, operation is easy and convenient, response is rapid, and the project progress and the production efficiency are improved.

Description

Technical fields:

[0001] This invention discloses a mechanism for rapidly switching air jet cleaning modes in a suction-type sandblasting gun. It belongs to the field of pneumatic sandblasting technology and is applied to surface engineering. Background technology:

[0002] After sandblasting, especially for steel structural components, workpieces require air cleaning to remove surface dust, preparing a clean surface for the next spraying and coating process. In practice, dedicated air guns and systems for cleaning are often equipped and used. Having two sets of equipment for sandblasting and air cleaning on-site creates inconvenience for management and operation, affecting work efficiency. The ability to quickly switch modes on a single set of equipment offers numerous benefits and is undoubtedly highly desirable.

[0003] Existing suction-type sandblasting guns do not have the function of switching air jet cleaning modes.

[0004] With the superior performance of wind tunnel sandblasting guns and guided sandblasting guns, the application scenarios that originally used pressure sandblasting machines are expanding to include high-efficiency suction sandblasting guns. This also provides a place for mechanisms that allow suction sandblasting guns to quickly switch air jet cleaning modes. Summary of the Invention:

[0005] The purpose of this invention is to add an air jet cleaning function to the normal sandblasting function of the suction-type sandblasting gun, including the wind tunnel gun and the guide gun, and to achieve rapid switching between sandblasting and air jet modes through a simple and convenient mechanism.

[0006] The mechanism for quickly switching the air jet cleaning mode of the suction-type sandblasting gun consists of a threaded tee, a rubber plug, and a hose connector installed at the original sand suction port of the suction-type sandblasting gun. One straight end of the tee is fixedly connected to the sand suction port of the sandblasting gun, and the other straight end is fitted with a hose connector, which is then connected to the conventional sand suction hose and the end suction device of the suction-type sandblasting gun. The side opening of the threaded tee is the control port for switching between the sandblasting mode and the air jet cleaning mode. The mode switching is accomplished by inserting and removing the rubber plug. The rubber plug is a soft rubber cylinder made of raw rubber or silicone rubber with a Shore hardness between 40 and 60. One end has a slightly larger diameter to form a flange for easy gripping, while the other end has a slightly smaller diameter to be inserted into the circular opening to form a fixed seal. When the diameter of the side opening of the tee is between the diameters of the large and small ends of the rubber plug, 1 / 3 to 2 / 3 of the length of the rubber plug will be inserted into the opening, with the insertion and fit designed to prevent air leakage.

[0007] When the rubber plug is inserted into the side opening of the threaded tee, the rubber plug seals the side opening through its conical seal and elastic deformation, forming an airtight seal. The vacuum negative pressure generated by the jet inside the suction-type sandblasting gun based on the ejector principle can be normally transmitted to the suction pipe and the suction device, and the sand-containing airflow is continuously supplied to the sandblasting gun. At this time, the sandblasting gun 1 is working in sandblasting mode. When the rubber plug 3 is removed, a large amount of outside air is drawn into the sandblasting gun along a short path, the vacuum negative pressure in the suction pipe is destroyed and disappears, and it no longer attracts sand-containing airflow. The sandblasting gun instantly switches to the jet cleaning mode. After the rubber plug is reinserted, the sandblasting gun switches back to sandblasting mode.

[0008] Beneficial effects:

[0009] By simply inserting and removing a rubber plug, two working states (operating modes) can be achieved at the lateral opening of the tee pipe: a sealed isolation and an open convection. After insertion, the rubber plug maintains its fixation and airflow seal due to the elastic deformation and rebound force. The seal disappears when the rubber plug is removed. Rubber plugs are also commonly used as sealing elements for container bottle or pipe openings, commonly known as bottle stoppers. These rubber plugs are made of soft rubber with a low Shore hardness, exhibiting large elastic deformation and good toughness, sufficient to fill rough surfaces, including threaded ends, and maintain a seal. In the sealed state, the air jet from the suction blasting gun creates a vacuum of approximately 50% in the suction pipe, which allows the plug to adhere more firmly. Based on the linear relationship between area and suction force, because the cross-sectional area of ​​the plug at the pipe opening is small, the actual suction force on the rubber plug does not affect the operability of manually inserting and removing it.

[0010] The mechanism for quickly switching cleaning modes in a suction-type sandblasting gun simply involves adding a threaded tee and a flexible rubber plug to the suction port of the sandblasting gun. The added burden is minimal, but the benefits are numerous: 1) One gun achieves two functions; 2) It avoids the investment and use of a separate pneumatic cleaning system; 3) The sandblasting gun has a fast air jet speed and a large air volume, resulting in higher cleaning efficiency, because the sandblasting gun is a pneumatic tool designed for speed output, and the air jet volume is higher than that of pure compressed air; 4) It is easy to operate and has a rapid response. Workers only need to insert or remove the flexible rubber plug on the gun to switch modes. Attached image description:

[0011] The working principle of the present invention will be further explained below with reference to the accompanying drawings.

[0012] Appendix Figure 1 This is a cross-sectional schematic diagram of an induction-type sandblasting gun with a rapidly switching jet cleaning mode. Note that this invention is not limited to induction-type sandblasting guns, but is applicable to all sandblasting guns based on the suction principle.

[0013] Appendix Figure 2This is a partially enlarged cross-sectional view of the three-way pipe structure that can quickly switch between jet cleaning modes, operating in sandblasting mode.

[0014] Appendix Figure 3 This is a partially enlarged cross-sectional view of the three-way structure that quickly switches between jet cleaning modes, operating in jet cleaning mode.

[0015] In the picture: 1. Original suction-type sandblasting gun; 2. Threaded tee pipe; 3. Rubber plug; 4. Hose connector. Detailed implementation method:

[0016] A mechanism for quickly switching airflow cleaning modes is added to suction-type sandblasting guns, including wind tunnel-type and induced-flow sandblasting guns. Its features include: a threaded tee 2, a rubber plug 3, and a hose connector 4 installed at the original sand-suction port of the suction-type sandblasting gun 1; one straight port of the threaded tee 2 is fixedly installed on the original sand-suction port of the sandblasting gun 1, and the hose connector 4 is installed at the other straight port of the threaded tee 2. The hose connector 4 connects to a conventionally configured suction hose and a sand-suction device at the end, used to attract sand-laden airflow; the switching of the working mode of the sandblasting gun 1 is accomplished by inserting and removing the rubber plug 3 at the side port of the threaded tee 2; when the rubber plug 3 is inserted into the side port, the sandblasting gun enters the suction... The sandblasting operation mode involves removing the rubber plug 3 from the side opening, instantly switching the sandblasting gun to air jet cleaning mode. The rubber plug 3 is a soft rubber cylinder made of raw rubber or silicone rubber with a Shore hardness between 40 and 60. One end has a slightly larger diameter, forming a flange for easy gripping, while the other end has a slightly smaller diameter, which can be inserted into the side circular opening of the threaded tee pipe 2 to form a fixed airtight seal. The diameter of the side circular opening of the threaded tee pipe 2 is larger than the diameter of the small end of the rubber plug 3 but smaller than the diameter of the large end. When the small end of the rubber plug 3 is inserted into the side opening of the threaded tee pipe 2, 1 / 3 to 2 / 3 of the length of the rubber plug 3 will be inserted into the opening, and the contact surface of the two forms a conical seal and a tight fit seal through elastic deformation.

[0017] When the rubber plug 3 is inserted into the side opening of the threaded tee pipe 2, the rubber plug 3 seals the side opening under the action of conical sealing and elastic deformation, forming an airtight seal. The vacuum negative pressure generated by the air jet inside the suction-type sandblasting gun based on the ejector principle can be normally transmitted to the sand suction pipe and sand suction device, and the sand-containing airflow is continuously supplied to the sandblasting gun. At this time, the sandblasting gun 1 is working in sandblasting mode. When the rubber plug 3 is removed, a large amount of outside air is drawn into the sandblasting gun along a short path, the vacuum negative pressure in the sand suction pipe is destroyed and disappears, and it no longer attracts sand-containing airflow. The sandblasting gun instantly switches to the air jet cleaning mode. After the rubber plug is re-inserted, the sandblasting gun switches back to sandblasting mode.

Claims

1. A mechanism for rapidly switching air jet cleaning modes in a suction-type sandblasting gun, characterized in that: It consists of a threaded tee 2, a rubber plug 3, and a hose connector 4, all installed at the sand suction port of the original sandblasting gun 1. One straight end of the threaded tee 2 is fixedly installed on the sand suction port of the original sandblasting gun 1, and the hose connector 4 is installed at the other straight end of the threaded tee 2. The hose connector 4 connects to a conventionally configured sand suction hose and a sand suction device at the end, used to attract sand-laden airflow. The switching of the working mode of the sandblasting gun 1 is accomplished by inserting and removing the rubber plug 3 at the side opening of the threaded tee 2. When the rubber plug 3 is inserted into the side opening, the sandblasting gun enters the sandblasting working mode that attracts sand-laden air. Remove the rubber plug 3 from the nozzle, and the sandblasting gun instantly switches to air jet cleaning mode. The rubber plug 3 is a soft rubber cylinder made of raw rubber or silicone rubber with a Shore hardness between 40 and 60. One end has a slightly larger diameter, forming a flange for easy gripping, while the other end has a slightly smaller diameter, which can be inserted into the lateral circular opening of the threaded tee pipe 2 to form a fixed airtight seal. The lateral circular opening diameter of the threaded tee pipe 2 is larger than the diameter of the small end of the rubber plug 3 but smaller than the diameter of the large end. The small end of the rubber plug 3 is inserted into the lateral opening of the threaded tee pipe 2, and the contact surfaces of the two form a conical seal and a tight fit seal through elastic deformation.

Images