Spraying and sucking device of sand blasting gun

Abstract

The utility model relates to a blasting and sucking device of a sand blasting gun, which comprises a body, a connecting pipe, a coupler and a nozzle, one end of the connecting pipe is inserted into the body, the other end of the connecting pipe is inserted into the coupler, the coupler is connected with the body, the nozzle is connected with the coupler, and a sand inlet pipe is arranged on the coupler; a first airflow channel communicated with an external air source is arranged in the body, the inner diameter of the first airflow channel is matched with the outer diameter of the connecting pipe, and the airflow channel of the connecting pipe is a variable-diameter airflow channel; in the coupler, a negative pressure cavity is defined by the connecting pipe, the sand inlet pipe and the nozzle, and the maximum inner diameter of the negative pressure cavity is smaller than the outer diameter of the nozzle. According to the spraying and sucking device, the feeding runner opening and the body runner are separately designed, the cavity in a special shape is reserved between the feeding runner opening and the body runner, caked abrasives can be pulverized in advance in the runner, the problem that a sand blasting pipe is prone to being blocked by wet abrasives is solved, the number of times of cleaning, abrasive drying and screen filtering is obviously reduced, and the requirement for the dryness of compressed air for driving a sand blasting gun is lower; and the runner is optimized, so that the efficiency is higher.

Description

Technical Field

[0001] The utility model belongs to the technical field of pneumatic tools, and in particular relates to a spraying and suction device for a sandblasting gun. Background Art

[0002] The spray-suction device of a sandblasting gun directs compressed air into a stream, creating negative pressure inside the gun. This siphons the abrasive, which is then ejected at high speed onto the workpiece surface along with the stream. Sandblasting achieves a certain degree of surface roughness and cleanliness, improving mechanical properties and coating performance, making it widely used in various industries. The spray-suction device directly affects the abrasive's impact force on the workpiece surface and the cutting effect, indirectly impacting work efficiency. Utility Model Content

[0003] The utility model aims to provide a spraying and suction device for a sandblasting gun, so as to improve the working efficiency of the sandblasting gun.

[0004] To achieve the above objectives, this application is implemented through the following technical solutions:

[0005] A sandblasting gun spraying and suction device comprises a body, a connecting pipe, a coupler and a nozzle. One end of the connecting pipe is inserted into the body, and the other end is inserted into the coupler. The coupler is connected to the body, and the nozzle is connected to the coupler. A sand inlet pipe is provided on the coupler.

[0006] A first air flow channel connected to an external air source is provided in the body, the inner diameter of the first air flow channel matches the outer diameter of the connecting pipe, and the air flow channel of the connecting pipe is a variable diameter air flow channel;

[0007] In the connector, a negative pressure cavity is defined by the connecting pipe, the sand inlet pipe and the nozzle, and the maximum inner diameter of the negative pressure cavity is smaller than the outer diameter of the nozzle.

[0008] Furthermore, the connecting pipe is provided with a second air flow channel, a third air flow channel and a fourth air flow channel which are connected in sequence, the third air flow channel connects the second air flow channel and the fourth air flow channel, and the inner diameter of the second air flow channel is larger than the inner diameter of the fourth air flow channel.

[0009] Furthermore, a fifth air flow channel is provided in the nozzle, and the inner diameter of the fifth air flow channel is larger than the inner diameter of the fourth air flow channel but smaller than the inner diameter of the second air flow channel.

[0010] Furthermore, the connecting pipe includes a connecting pipe body, and a radially extending flange portion is provided on the outer side of the connecting pipe body. The outer diameter of the flange portion is larger than the inner diameter of the first air flow channel and smaller than the outer diameter of the front end portion of the body.

[0011] Furthermore, the inner cavity of the connector includes a first cavity, a second cavity, a third cavity and a fourth cavity from front to back; wherein, the nozzle is arranged in the first cavity, the negative pressure cavity is the second cavity, the front end of the connecting pipe passes through the third cavity, and the flange portion of the connecting pipe and the front end of the body are both arranged in the fourth cavity.

[0012] Furthermore, the connector is connected to the nozzle via a first screw, and the connector is connected to the body via a second screw.

[0013] Furthermore, it also includes a first flat washer and a first O-ring, and the first flat washer and the first O-ring are respectively sleeved on the connecting pipes on both sides of the flange part.

[0014] The beneficial effects of the utility model are:

[0015] The feed flow channel of the spray and suction device of this device is designed to be separated from the flow channel of the main body. The flow channel is divided into two sections with a specially shaped cavity in the middle. The agglomerated abrasive will be pre-powdered in the flow channel, which improves the problem that the sandblasting tube is easily blocked by wet abrasive, significantly reduces the number of cleaning, abrasive drying and screen filtering, and has lower dryness requirements for the compressed air driving the sandblasting gun. The flow channel has been optimized and the efficiency is higher. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is an exploded view of the sandblasting gun of this utility model.

[0017] Figure 2 This is a schematic diagram of the structure of the spraying and suction device of the sandblasting gun of the present utility model.

[0018] Figure 3 for Figure 2 XX cross-sectional view.

[0019] Figure 4 This is an exploded view of the spray-suction device of the utility model.

[0020] Figure 5 Schematic diagram of the airflow direction of the sandblasting gun.

[0021] Figure 6 for Figure 5 Enlarged view of point A.

[0022] Description of reference numerals:

[0023] 1. Main body; 2. Trigger compression spring; 3. Second flat washer; 4. Opening and closing pin; 5. Compression spring; 6. Second O-ring; 7. Bolt; 8. Third O-ring; 9. Air inlet connector; 10. First O-ring; 11. Connecting pipe; 12. First flat washer; 13. First screw; 14. Connector; 15. Second screw; 16. Nozzle; 17. Trigger; 18. Rotating shaft; 19. Sandblasting bucket; 20. Discharge pipe; 21. Hose clamp; 22. Rubber air duct; 23. Negative pressure cavity; 111. Second air flow channel; 112. Third air flow channel; 113. Fourth air flow channel; 141. First cavity; 142. Second cavity; 143. Third cavity; 144. Fourth cavity; 161. Fifth air flow channel. DETAILED DESCRIPTION

[0024] The technical solution of the present invention is described in detail below with reference to the accompanying drawings. The following embodiments are merely exemplary and can only be used to explain and illustrate the technical solution of the present invention, and cannot be interpreted as limiting the technical solution of the present invention.

[0025] like Figures 1 to 6 As shown, the present application provides a sandblasting gun spraying and suction device, including a main body 1, a connecting pipe 11, a connector 14 and a nozzle 16. One end of the connecting pipe is inserted into the main body, and the other end is inserted into the connector. The connector is connected to the main body, and the nozzle is connected to the connector. A sand inlet pipe is provided on the connector.

[0026] The main body is provided with a first airflow channel connected to an external air source. The inner diameter of the first airflow channel matches the outer diameter of the connecting tube, and the airflow channel of the connecting tube is a variable diameter airflow channel. The connecting tube is provided with a second airflow channel 111, a third airflow channel 112, and a fourth airflow channel 113, which are connected in sequence. The third airflow channel 112 connects the second airflow channel 111 and the fourth airflow channel 113, and the inner diameter of the second airflow channel is larger than that of the fourth airflow channel. The main body also includes a first flat washer 12 and a first O-ring 10, which are respectively placed on the connecting tube on both sides of the flange.

[0027] A fifth air flow channel 161 is provided in the nozzle 16 . The inner diameter of the fifth air flow channel is larger than the inner diameter of the fourth air flow channel but smaller than the inner diameter of the second air flow channel.

[0028] In the connector, a negative pressure cavity 23 is defined by the connecting pipe 11, the sand inlet pipe and the nozzle 16. The maximum inner diameter of the negative pressure cavity is smaller than the outer diameter of the nozzle.

[0029] In the present application, the connecting pipe includes a connecting pipe body, and a radially extending flange portion is provided on the outer side of the connecting pipe body. The outer diameter of the flange portion is larger than the inner diameter of the first air flow channel and smaller than the outer diameter of the front end of the body.

[0030] In the present application, the inner cavity of the connector 14 includes a first cavity 141, a second cavity 142, a third cavity 143 and a fourth cavity 144 from front to back; wherein, the nozzle is arranged in the first cavity, the negative pressure cavity is the second cavity, the front end of the connecting pipe passes through the third cavity, and the flange part of the connecting pipe and the front end of the body are both arranged in the fourth cavity.

[0031] In the present application, the connector 14 is connected to the nozzle 16 via a second screw connection 15 , and the connector 14 is connected to the body 1 via a first screw 13 .

[0032] The present application also includes a trigger assembly and an opening and closing pin assembly. These two parts are conventional components of a sandblasting gun. In the technical solution of the present application, no improvement is made to these two parts. Therefore, the technical solution of these two parts is not described in detail in the present application. Those skilled in the art can obtain the structure of these two parts and their connection relationship with the main body based on conventional knowledge.

[0033] The opening and closing pin assembly of the present application includes a second flat washer 3, an opening and closing pin 4, a compression spring 5, a bolt 7, and a second O-ring 6. Assembled according to conventional techniques, when the trigger is pressed, the opening and closing pin, the compression spring, and other related components are displaced, and air flows through the gap between the opening and closing pin and the second flat washer, entering the flow channel and the ejector / suction device on the other side of the body. When air flows through the ejector / suction device, negative pressure is generated, and the abrasive contained in the sandblasting bucket is sucked into the ejector / suction device through the rubber air duct and discharged from the nozzle with the high-speed airflow.

[0034] The trigger assembly includes a trigger 17, a rotating shaft 18 and a trigger compression spring 2. The rotating shaft passes through the trigger, the trigger compression spring and the body, and its installation method is conventional technology.

[0035] The sandblasting gun of the present application also includes a sandblasting barrel 19, a throat clamp 21, and a rubber air duct 22. One end of the rubber air duct is installed at the discharge pipe 20 below the sandblasting barrel and fixed by a throat clamp, and the other end is connected to the sand inlet pipe.

[0036] When air flows through the ejector-suction mechanism, negative pressure is generated. The abrasive contained in the sandblasting barrel is drawn into the ejector-suction mechanism through a rubber air duct and ejected from the nozzle along with the high-speed airflow. When the trigger is released, the compression spring pushes the opening and closing pin back into place, closing the gap between the pin and the flat washer, stopping air flow and shutting off the sandblaster. Verification has shown that the closer the nozzle and suction port of the ejector-suction mechanism are, the greater the impact of the abrasive ejection. This ejector-suction mechanism features a separate feed channel from the main flow channel. The channel is divided into two sections, with a specially shaped cavity in between. This pre-pulverizes abrasive within the channel, mitigating the problem of wet abrasive clogging the sandblasting hose. This significantly reduces cleaning, abrasive drying, and filtration, and reduces the dryness requirement of the compressed air driving the sandblaster. This optimized channel is theoretically capable of ejecting abrasive particles with a maximum diameter of 0.5 mm, including materials such as copper ore sand, quartz sand, iron sand, sea sand, corundum, and walnut sand. In actual testing, the device achieved a year-over-year decrease in air consumption of approximately 0.3 SCFM at a standard air pressure of 90 PSI, while sand output per unit time remained stable at ±2%. The nozzle can be quickly replaced by simply loosening the set screw with a hexagonal wrench. Different abrasives and corresponding nozzle materials, such as boron carbide, alloy steel, tungsten carbide, and iron, are available to suit different work scenarios.

[0037] Of course, the above description is not a limitation of the present invention, and the present invention is not limited to the above examples. Any changes, modifications, additions or substitutions made by ordinary technicians in this technical field within the essential scope of the present invention should fall within the scope of protection of the present invention.

Claims

1. A sandblasting gun spraying and suction device, characterized in that: It includes a body, a connecting pipe, a coupler and a nozzle. One end of the connecting pipe is inserted into the body, and the other end is inserted into the coupler. The coupler is connected to the body, and the nozzle is connected to the coupler. A sand inlet pipe is provided on the coupler. A first air flow channel connected to an external air source is provided in the body, the inner diameter of the first air flow channel matches the outer diameter of the connecting pipe, and the air flow channel of the connecting pipe is a variable diameter air flow channel; In the connector, a negative pressure cavity is defined by the connecting pipe, the sand inlet pipe and the nozzle, and the maximum inner diameter of the negative pressure cavity is smaller than the outer diameter of the nozzle.

2. The sandblasting gun spraying and suction device according to claim 1, characterized in that: The connecting pipe is provided with a second air flow channel, a third air flow channel and a fourth air flow channel which are connected in sequence. The third air flow channel connects the second air flow channel and the fourth air flow channel, and the inner diameter of the second air flow channel is larger than the inner diameter of the fourth air flow channel.

3. The spray-suction device for a sandblasting gun according to claim 2, characterized in that: A fifth air flow channel is provided in the nozzle, and an inner diameter of the fifth air flow channel is larger than an inner diameter of the fourth air flow channel but smaller than an inner diameter of the second air flow channel.

4. The spray-suction device for a sandblasting gun according to claim 1, characterized in that: The connecting pipe includes a connecting pipe body, and a radially extending flange portion is provided on the outer side of the connecting pipe body. The outer diameter of the flange portion is larger than the inner diameter of the first air flow channel and smaller than the outer diameter of the front end portion of the body.

5. The spray-suction device for a sandblasting gun according to claim 4, characterized in that: The inner cavity of the connector includes a first cavity, a second cavity, a third cavity and a fourth cavity from front to back; wherein, the nozzle is arranged in the first cavity, the negative pressure cavity is the second cavity, the front end of the connecting pipe passes through the third cavity, and the flange part of the connecting pipe and the front end of the body are both arranged in the fourth cavity.

6. The spray-suction device for a sandblasting gun according to claim 1, characterized in that: The connector is connected to the nozzle via a first screw, and the connector is connected to the body via a second screw.

7. The spray-suction device for a sandblasting gun according to claim 1, characterized in that: It also includes a first flat washer and a first O-ring, which are respectively sleeved on the connecting pipes on both sides of the flange part.

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