Aerosol spray device

Abstract

The utility model relates to pneumatic spraying machine technical field, and disclose a kind of pneumatic spraying machine piston rod connecting structure, including cylinder, piston, piston rod, cylinder lower cover and plunger rod.Using this structure, simple structure, firm connection, high reliability;And through piston rod and piston screw connection, and cooperate the mode of first locking nut screw connection, form double nut and tighten structure, to solve the problem that piston rod and piston connection is easy to loosen, again save the tedious step of aligning hole position, dismounting split pin, compared with traditional split pin structure dismounting more convenient.

Description

Technical Field

[0001] This utility model relates to the field of pneumatic spraying machine technology, specifically to a piston rod connection structure for a pneumatic spraying machine. Background Technology

[0002] The piston rod and piston connection in existing pneumatic spraying machines have significant defects: Traditional connection methods typically involve an internal thread at the piston's rotation center, which is then fastened to the external thread at the upper end of the piston rod; or a through hole at the piston's rotation center, with external threads and a step at the upper end of the piston rod. The upper section of the piston rod passes through the piston and is secured with a washer and nut. To prevent the nut from loosening, slots are usually cut on the six clamping surfaces of the nut, and a transverse hole is provided on the piston rod. A cotter pin is inserted through this transverse hole and the slot on the nut, then pried open to prevent it from falling out. The first connection method is prone to loosening and lacks reliability; the second method is reliable enough, but its structure is complex, requiring both piston clamping and alignment of the slot on the nut with the transverse hole on the piston rod during assembly, and the process of installing and removing the cotter pin is cumbersome.

[0003] Currently, the connection between the lower end of the piston rod and the upper end of the plunger rod in existing pneumatic spraying machines typically uses a threaded structure or a ferrule structure. However, threaded connections are time-consuming and labor-intensive to connect and disassemble, while ferrule structures are convenient to connect and disassemble. However, the existing ferrule structure's anti-loosening design is not ideal, and loosening can occur during spraying machine operation, causing downtime and affecting spraying work. Therefore, the existing piston rod connection structure needs to be optimized and improved. Utility Model Content

[0004] The present invention provides a piston rod connection structure for a pneumatic spraying machine, which solves the problems of easy loosening, inconvenient disassembly and assembly, and insufficient reliability of existing connection structures.

[0005] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0006] A piston rod connection structure for a pneumatic spraying machine includes a cylinder, a piston, a piston rod, a lower cylinder cover, and a plunger rod. The lower cylinder cover is detachably connected to the lower end of the cylinder, and a piston sleeve is disposed inside the cylinder. The piston rod is threadedly connected to the piston, and the upper end of the piston rod passes through the piston and is threadedly connected to a first locking nut. The piston rod passes through the lower cylinder cover, and a sealing seat is provided between the piston rod and the lower cylinder cover. The plunger rod is connected to the lower end of the piston rod via a clamping assembly. Specifically, the piston is disc-shaped, and its center of rotation has an internally threaded through hole. Specifically, the cylinder has a groove for engaging the first locking nut. In use, the piston rod is threaded onto the piston. After the piston rod passes through the piston, it is threaded onto the first locking nut. The piston and piston rod are then placed into the cylinder. A lower cylinder cover is then connected to the lower end of the cylinder, and the piston rod passes through the lower cylinder cover. After the lower cylinder cover is in place, a sealing seat is installed between it and the piston rod. Finally, a ferrule assembly connects the lower end of the piston rod and the upper end of the plunger rod. This structure is simple, secure, and highly reliable. The threaded connection between the piston rod and piston, combined with the threaded connection of the first locking nut, forms a double-nut tightening structure, solving the problem of easy loosening of the piston rod and piston connection. It also eliminates the tedious steps of aligning holes and disassembling and assembling cotter pins, making it more convenient to assemble and disassemble compared to traditional cotter pin structures.

[0007] Furthermore, the piston rod comprises a first piston rod cylinder, a second piston rod cylinder, a third piston rod cylinder, a fourth piston rod cylinder, and a fifth piston rod cylinder arranged concentrically in sequence. The outer diameter of the second piston rod cylinder is larger than the outer diameters of the first and third piston rod cylinders; the outer diameter of the fourth piston rod cylinder is smaller than the outer diameter of the third piston rod cylinder; the outer diameter of the fifth piston rod cylinder is less than or equal to the outer diameter of the third piston rod cylinder, and larger than the outer diameter of the fourth piston rod cylinder; the first piston rod cylinder is threadedly connected to the piston. The third piston rod cylinder serves as the sliding working surface of the piston rod. The cross-sectional area of ​​the fourth piston rod cylinder is approximately half the cross-sectional area of ​​the fifth piston rod cylinder. Specifically, the first, second, third, fourth, and fifth piston rod cylinders can be integrally machined. In use, the first piston rod cylinder is threadedly connected to the piston. The second piston rod cylinder engages with the lower side of the piston for positioning. The fourth and fifth piston rod cylinders are used in conjunction with the ferrule assembly for installation. This multi-segment concentric cylindrical structure allows for customized outer diameter and precision settings, ensuring the stability of the sliding working surface while allowing for adaptation to different connecting components through differentiated outer diameters.

[0008] Furthermore, the second piston rod cylinder is provided with 2-6 wrench clamping surfaces. This structure provides a stable point of force application for disassembly and assembly, preventing slippage during installation and removal.

[0009] Furthermore, the sealing seat contains, from bottom to top, a bushing, a Y-shaped sealing ring, and a retaining ring. The sealing seat is threadedly connected to the lower cylinder cover, and a second locking nut that mates with the lower cylinder cover is provided on the sealing seat. An end-seat sealing ring is provided between the upper outer end of the sealing seat and the lower cylinder cover. Specifically, the lower end face of the lower cylinder cover has an internal thread along the rotation center. The bushing is made of a wear-resistant material with an extremely low coefficient of friction. Its outer diameter is interference-fitted with the inner diameter of the sealing seat, and its inner diameter is slidingly fitted with the outer diameter of the third section of the piston rod cylinder. With this structure, the sealing seat uses a threaded connection, eliminating the need to disassemble the cylinder when replacing corresponding parts, greatly simplifying the maintenance process. The wear-resistant bushing combined with the multi-layer sealing structure reduces sliding friction loss, improves sealing performance, and extends the service life of the equipment.

[0010] Furthermore, the plunger rod includes a first plunger rod cylinder, a second plunger rod cylinder, a third frustum-shaped section, and a fourth plunger rod cylinder arranged concentrically in sequence. The outer diameter of the first plunger rod cylinder is the same as the outer diameter of the fifth piston rod cylinder; the outer diameter of the second plunger rod cylinder is the same as the outer diameter of the fourth piston rod cylinder. The third frustum-shaped section serves as a transition between the second and fourth plunger rod cylinders, allowing the plunger rod to easily pass through the sealing ring during assembly. The fourth plunger rod cylinder is the sliding working surface of the plunger rod, and its outer diameter is greater than or equal to the outer diameter of the first plunger rod cylinder. This structure, with its multiple concentric sections, avoids eccentric transmission and facilitates installation using the first and second plunger rod cylinders in conjunction with the ferrule assembly.

[0011] Furthermore, the ferrule assembly includes two semi-circular ferrules for locking and limiting the fifth piston rod cylinder and the first plunger rod cylinder. Each semi-circular ferrule has an upper mating groove at its upper end that mates with the fourth piston rod cylinder and a lower mating groove at its lower end that mates with the second plunger rod cylinder. Anti-loosening sleeves are provided on the outer sides of the two semi-circular ferrules, and the upper end of each anti-loosening sleeve has a radial threaded hole, into which an anti-loosening screw is threaded. Specifically, the two semi-circular ferrules have identical structures and are generally cylindrical. This structure retains the advantages of traditional ferrules in terms of easy assembly and disassembly, and with the double fixation of the anti-loosening sleeve and anti-loosening screw, it completely solves the problem of easy loosening of ordinary ferrules, balancing convenience and stability.

[0012] Furthermore, each of the semi-circular sleeves has a central mating groove. The upper mating groove is clearance-fitted with the outer diameter of the fourth piston rod cylinder, the central mating groove is clearance-fitted with the outer diameters of the fifth piston rod cylinder and the first plunger rod cylinder, and the lower mating groove is clearance-fitted with the outer diameter of the second plunger rod cylinder. This structure, with its multi-groove clearance fit design, achieves precise positioning of the piston rod and plunger rod. The symmetrical semi-circular structure facilitates quick and easy assembly, improving assembly efficiency.

[0013] Furthermore, a sealing groove is formed on the outer diameter of the piston, and a star-shaped sealing ring is provided between the sealing groove and the inner wall of the cylinder. This structure ensures sealing performance.

[0014] Furthermore, the lower cylinder cover is detachably connected to the cylinder by bolts, and a cylinder sealing ring is provided between the lower cylinder cover and the cylinder. This detachable bolt connection facilitates the disassembly and maintenance of the lower cylinder cover, while the cylinder sealing ring ensures the airtightness of the connection between the cylinder and the lower cover, preventing air pressure leakage from affecting the equipment's operating efficiency.

[0015] Beneficial effects: Simple structure, firm connection, and high reliability; the piston rod and piston are connected by threads, and the first locking nut is also threaded, forming a double-nut tightening structure, thus solving the problem of easy loosening of the piston rod and piston connection, and eliminating the tedious steps of aligning holes and disassembling and assembling cotter pins, making disassembly and assembly more convenient than traditional cotter pin structures. The sealing seat adopts a threaded connection, eliminating the need to disassemble the cylinder when replacing corresponding parts, greatly simplifying the maintenance process; the combination of wear-resistant bushing and multi-layer sealing structure reduces sliding friction loss, improves sealing performance, and extends the service life of the equipment. The semi-circular ferrule structure retains the advantages of easy disassembly and assembly of traditional ferrules, and with the double fixing of anti-loosening sleeve and anti-loosening screw, it completely solves the problem of easy loosening of ordinary ferrules, balancing convenience and stability. The end of the anti-loosening screw can fit tightly against the outer diameter of the fourth piston rod cylinder, improving the reliability of anti-loosening fixation and ensuring long-term stable operation of the equipment. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the piston rod connection structure of the pneumatic spraying machine in this embodiment;

[0017] Reference numerals: 1. Cylinder; 2. First locking nut; 3. Piston; 4. Piston rod; 5. Lower cylinder cover; 6. Retaining ring; 7. End seat seal ring; 8. Y-shaped seal ring; 9. Second locking nut; 10. Bushing; 11. Sealing seat; 12. Anti-loosening screw; 13. Anti-loosening sleeve; 14. Semi-circular ferrule; 15. Plunger rod; 16. Bolt; 17. Cylinder body seal ring; 18. Star-shaped seal ring; 4.1. First piston rod cylinder; 4.2. Second piston rod cylinder; 4.3. Third piston rod cylinder; 4.4. Fourth piston rod cylinder; 4.5. First plunger rod cylinder; 15.1. Second plunger rod cylinder; 15.2. Third truncated cone; 15.3. Fourth plunger rod cylinder; 15.4. Detailed Implementation

[0018] The following will provide a more detailed description of the technical solution of the piston rod connection structure of a pneumatic spraying machine according to the present invention, with reference to the embodiments.

[0019] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0020] like Figure 1As shown, this embodiment of a pneumatic spraying machine piston rod connection structure includes a cylinder 1, a piston 3, a piston rod 4, a cylinder lower cover 5, and a plunger rod 15. The cylinder lower cover 5 is detachably connected to the lower end of the cylinder 1, and the piston 3 is sleeved inside the cylinder 1. The piston rod 4 is threadedly connected to the piston 3, and the upper end of the piston rod 4 passes through the piston 3 and is threadedly connected to a first locking nut 2. The piston rod 4 passes through the cylinder lower cover 5, and a sealing seat 11 is provided between the piston rod 4 and the cylinder lower cover 5. The plunger rod 15 is connected to the lower end of the piston rod 4 through a clamping assembly. Specifically, the piston 3 is disc-shaped, and its rotation center is provided with an internally threaded through hole. Specifically, the cylinder 1 has a groove that mates with the first locking nut 2. The piston rod 4 comprises a first piston rod cylinder 4.1, a second piston rod cylinder 4.2, a third piston rod cylinder 4.3, a fourth piston rod cylinder 4.4, and a fifth piston rod cylinder 4.5 arranged concentrically in sequence. The outer diameter of the second piston rod cylinder 4.2 is larger than the outer diameters of the first piston rod cylinder 4.1 and the third piston rod cylinder 4.3. The outer diameter of the fourth piston rod cylinder 4.4 is smaller than the outer diameter of the third piston rod cylinder 4.3. The outer diameter of the fifth piston rod cylinder 4.5 is less than or equal to the outer diameter of the third piston rod cylinder 4.3, and larger than the outer diameter of the fourth piston rod cylinder 4.4. The first piston rod cylinder 4.1 is threadedly connected to the piston 3. The third piston rod cylinder 4.3 serves as the sliding working surface of the piston rod 4. The cross-sectional area of ​​the fourth piston rod cylinder 4.4 is approximately half the cross-sectional area of ​​the fifth piston rod cylinder 4.5. The second piston rod cylinder 4.2 has 2-6 wrench clamping surfaces. Inside the sealing seat 11, from bottom to top, are arranged a bushing 10, a Y-shaped sealing ring 8, and a retaining ring 6. The sealing seat 11 is threadedly connected to the lower cylinder cover 5, and a second locking nut 9 that mates with the lower cylinder cover 5 is provided on the sealing seat 11. An end-seat sealing ring 7 is provided between the upper outer end of the sealing seat 11 and the lower cylinder cover 5. Specifically, the lower end face of the lower cylinder cover 5 has an internal thread along the rotation center. The plunger rod 15 includes a first plunger rod cylinder 15.1, a second plunger rod cylinder 15.2, a third frustum 15.3, and a fourth plunger rod cylinder 15.4 arranged concentrically in sequence; the outer diameter of the first plunger rod cylinder 15.1 is the same as the outer diameter of the fifth piston rod cylinder 4.5; the outer diameter of the second plunger rod cylinder 15.2 is the same as the outer diameter of the fourth piston rod cylinder 4.4.The ferrule assembly includes two semi-circular ferrules 14 for ferruling and limiting the fifth piston rod cylinder 4.5 and the first plunger rod cylinder 15.1. Each semi-circular ferrule 14 has an upper mating groove at its upper end that mates with the fourth piston rod cylinder 4.4 and a lower mating groove at its lower end that mates with the second plunger rod cylinder 15.2. Anti-loosening sleeves 13 are provided on the outer sides of the two semi-circular ferrules 14. The upper end of the anti-loosening sleeve 13 has a radial threaded hole, and an anti-loosening screw 12 is threaded into the radial threaded hole. Each semi-circular ferrule 14 has a middle mating groove. The upper mating groove is in clearance fit with the outer diameter of the fourth piston rod cylinder 4.4, the middle mating groove is in clearance fit with the outer diameters of the fifth piston rod cylinder 4.5 and the first plunger rod cylinder 15.1, and the lower mating groove is in clearance fit with the outer diameter of the second plunger rod cylinder 15.2. The piston 3 has a sealing groove on its outer diameter, and a star-shaped sealing ring 18 is provided between the sealing groove and the inner wall of the cylinder 1. The cylinder lower cover 5 is detachably connected to the cylinder 1 by bolts 16, and a cylinder body sealing ring 17 is provided between the cylinder lower cover 5 and the cylinder 1. In use, the piston rod 4 is threaded onto the piston 3, and after the piston rod 4 passes through the piston 3, it is threaded onto the first locking nut 2. Then, the piston 3 together with the piston rod 4 is placed into the cylinder 1, and the cylinder lower cover 5 is connected to the lower end of the cylinder 1. The piston rod 4 passes through the cylinder lower cover 5. After the cylinder lower cover 5 is in place, a sealing seat 11 is installed between it and the piston rod 4. Finally, the lower end of the piston rod 4 and the upper end of the plunger rod 15 are connected by a ferrule assembly. This structure is simple, secure, and highly reliable. The piston rod 4 is threadedly connected to the piston 3, and the first locking nut 2 is also threadedly connected, forming a double-nut tightening structure. This solves the problem of easy loosening of the connection between the piston rod 4 and the piston 3, and eliminates the tedious steps of aligning holes and disassembling and assembling cotter pins. Compared to traditional cotter pin structures, it is more convenient to disassemble and assemble. The sealing seat 11 uses a threaded connection, eliminating the need to disassemble the cylinder 1 when replacing corresponding parts, greatly simplifying the maintenance process. The wear-resistant bushing 10, combined with the multi-layer sealing structure, reduces sliding friction loss, improves sealing performance, and extends the service life of the equipment. The semi-circular ferrule 14 retains the advantages of easy disassembly and assembly of traditional ferrules. Combined with the double fixing of the anti-loosening sleeve 13 and the anti-loosening screw 12, it completely solves the problem of easy loosening of ordinary ferrules, balancing convenience and stability. The end of the anti-loosening screw 12 can tightly fit onto the outer diameter of the fourth piston rod cylinder, improving the reliability of the anti-loosening fixation and ensuring long-term stable operation of the equipment.

[0021] 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 piston rod connection structure for a pneumatic spraying machine, characterized in that: The system includes a cylinder, a piston, a piston rod, a cylinder lower cover, and a plunger rod; the cylinder lower cover is detachably connected to the lower end of the cylinder, and the piston sleeve is disposed inside the cylinder; the piston rod is threadedly connected to the piston, and the upper end of the piston rod passes through the piston and is threadedly connected to a first locking nut; the piston rod passes through the cylinder lower cover, and a sealing seat is provided between the piston rod and the cylinder lower cover; the plunger rod is connected to the lower end of the piston rod through a clamping assembly.

2. The piston rod connection structure of a pneumatic spraying machine according to claim 1, characterized in that: The piston rod comprises a first piston rod cylinder, a second piston rod cylinder, a third piston rod cylinder, a fourth piston rod cylinder, and a fifth piston rod cylinder arranged concentrically in sequence. The outer diameter of the second piston rod cylinder is greater than the outer diameters of the first and third piston rod cylinders. The outer diameter of the fourth piston rod cylinder is less than the outer diameter of the third piston rod cylinder. The outer diameter of the fifth piston rod cylinder is less than or equal to the outer diameter of the third piston rod cylinder, but greater than the outer diameter of the fourth piston rod cylinder. The first piston rod cylinder is threadedly connected to the piston.

3. The piston rod connection structure of a pneumatic spraying machine according to claim 2, characterized in that: The second section of the piston rod cylinder is provided with 2-6 wrench clamping surfaces.

4. The piston rod connection structure of a pneumatic spraying machine according to claim 1, characterized in that: The sealing seat is provided with a bushing, a Y-shaped sealing ring and a retaining ring arranged sequentially from bottom to top; the sealing seat is threadedly connected to the lower cover of the cylinder, and a second locking nut that matches the lower cover of the cylinder is provided on the sealing seat; an end seat sealing ring is provided between the upper outer end of the sealing seat and the lower cover of the cylinder.

5. The piston rod connection structure of a pneumatic spraying machine according to claim 2, characterized in that: The plunger rod includes a first plunger rod cylinder, a second plunger rod cylinder, a third frustum-shaped section, and a fourth plunger rod cylinder arranged concentrically in sequence; the outer diameter of the first plunger rod cylinder is the same as the outer diameter of the fifth piston rod cylinder; the outer diameter of the second plunger rod cylinder is the same as the outer diameter of the fourth piston rod cylinder; the outer diameter of the fourth plunger rod cylinder is greater than or equal to the outer diameter of the first plunger rod cylinder.

6. The piston rod connection structure of a pneumatic spraying machine according to claim 5, characterized in that: The ferrule assembly includes two semi-circular ferrules for ferruling and limiting the fifth piston rod cylinder and the first plunger rod cylinder. Each semi-circular ferrule has an upper mating groove at its upper end that mates with the fourth piston rod cylinder and a lower mating groove at its lower end that mates with the second plunger rod cylinder. Anti-loosening sleeves are provided on the outer sides of the two semi-circular ferrules. The upper end of each anti-loosening sleeve has a radial threaded hole, and an anti-loosening screw is internally threaded into the radial threaded hole.

7. The piston rod connection structure of a pneumatic spraying machine according to claim 6, characterized in that: Each of the semi-circular sleeves has a middle fitting groove, and the upper fitting groove is in clearance fit with the outer diameter of the fourth piston rod cylinder, the middle fitting groove is in clearance fit with the outer diameter of the fifth piston rod cylinder and the first plunger rod cylinder, and the lower fitting groove is in clearance fit with the outer diameter of the second plunger rod cylinder.

8. The piston rod connection structure of a pneumatic spraying machine according to claim 1, characterized in that: The piston has a sealing groove on its outer diameter, and a star-shaped sealing ring is provided between the sealing groove and the inner wall of the cylinder.

9. The piston rod connection structure of a pneumatic spraying machine according to claim 1, characterized in that: The cylinder lower cover is detachably connected to the cylinder by bolts, and a cylinder sealing ring is provided between the cylinder lower cover and the cylinder.

Images