Improved structure of air cylinder of pneumatic chipping hammer
By improving the cylinder structure to an axial through-hole and using threaded connections, the machining process was simplified, machining accuracy and production efficiency were improved, and the problem of high machining difficulty in traditional cylinders was solved.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-07
- Publication Date
- 2026-03-10
AI Technical Summary
Traditional cylinders are difficult to manufacture, have low production efficiency, and have complex structures.
The design adopts an axially through-hole design, with the chuck body and cylinder connected by threads. The chuck sleeve is prevented from slipping by limiting steel balls and a return spring. The cylinder has a return air channel that is directly milled through the connecting channel.
It simplifies the processing technology, improves processing accuracy and production efficiency, reduces processing difficulty, and enhances product quality.
Smart Images
Figure CN223984641U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the technical field of pneumatic tools, and in particular to an improved structure of a pneumatic shovel cylinder. Background Technology
[0002] Pneumatic chisels are widely used for rust removal on metal surfaces in ships, bridges, and steel structures due to their ease of use and flexible operation. A typical pneumatic chisel consists of a handle body, cylinder, piston, chuck body, chuck sleeve, valve seat assembly, on / off valve assembly, and air inlet connector. Traditionally, the cylinder is constructed by first machining a relatively large blind hole from back to front to form the cylinder barrel, and then machining a smaller hole from front to back through the cylinder barrel. This cylinder barrel design is difficult to machine and has low production efficiency. Summary of the Invention
[0003] The technical problem to be solved by this utility model is to provide an improved structure for a pneumatic shovel cylinder that is highly accurate, simple in structure, and easy to process, in light of the existing technology.
[0004] The technical solution adopted by this utility model to solve the above-mentioned technical problems is as follows:
[0005] An improved structure for a pneumatic shovel cylinder includes a cylinder, a chuck body, and a chuck sleeve. The cylinder barrel is formed by an axially through-hole, and the front end of the cylinder barrel is enlarged to form a mounting screw hole. The chuck body is connected to the cylinder by a threaded connection, and the rear end of the chuck body is machined with an external thread section for threaded connection with the mounting screw hole. The chuck sleeve is fitted onto the chuck body in an anti-slip manner.
[0006] To optimize the above technical solution, the following measures were also taken:
[0007] The aforementioned chuck body has an annular shoulder machined at the front end of the external thread section for positioning and engaging with the front end face of the cylinder.
[0008] The aforementioned chuck body has four locking holes formed circumferentially at 90-degree intervals, each locking hole containing a limiting steel ball, and the sleeve of the chuck sleeve has a limiting protrusion ring formed to limit the radial movement space of the limiting steel ball.
[0009] The aforementioned chuck body is fitted with a return spring to force the chuck sleeve to move forward, and the front end of the chuck body is fitted with a wire retaining ring to prevent the chuck sleeve from coming off.
[0010] When the front end of the chuck is in contact with the wire retaining ring, the rear end of the chuck should cover at least half the width of the annular shoulder.
[0011] The cylinder is fitted with a cylinder liner at the front middle section of the corresponding cylinder barrel on its circumferential surface.
[0012] The cylinder described above has an axial return air channel machined in it, and the front end of the cylinder barrel is milled through with a milling cutter or turned through with a turning tool to form a connecting channel for connecting the cylinder barrel and the return air channel.
[0013] Compared with existing technologies, the cylinder of this invention features a through-hole formed axially, significantly reducing the difficulty of the machining process and greatly improving machining accuracy. Because this invention directly machines a through-hole with a sufficiently large diameter, the connection channel between the return air passage and the cylinder barrel can be directly milled through with a milling cutter, eliminating the need for drilling process holes as in traditional processes. Through further improvements, this invention reduces the difficulty of cylinder machining, thereby improving product production efficiency and quality. Attached Figure Description
[0014] Figure 1 This is a schematic diagram of the structure of this utility model;
[0015] Figure 2 This is a schematic diagram of the structure of the cylinder of this utility model;
[0016] Figure 3 This is a schematic diagram of the structure of the chuck body of this utility model;
[0017] Figure 4 This is a schematic diagram of the structure of the clamp sleeve of this utility model;
[0018] Figure 5 This is a schematic diagram of the assembly of the utility model and the handle body. Detailed Implementation
[0019] The embodiments of this utility model will be described in further detail below with reference to the accompanying drawings.
[0020] Figures 1 to 5 This is a schematic diagram of the structure of this utility model.
[0021] The attached figures are labeled as follows: cylinder 1, cylinder barrel 1a, assembly screw hole 1b, air return channel 1c, connecting channel 1d, chuck body 2, clasp hole 2a, external thread section 21, annular shoulder 22, chuck sleeve 3, limiting protrusion ring 31, limiting steel ball 4, return spring 5, steel wire retaining ring 6, cylinder liner ring 7, piston 8, handle body 9.
[0022] like Figures 1 to 4As shown, this utility model discloses an improved structure for a pneumatic shovel cylinder. The improved structure mainly includes a cylinder 1, a chuck body 2, and a chuck sleeve 3. The cylinder barrel 1a of the cylinder 1 is no longer machined into a blind hole as in traditional methods; instead, it is directly machined into a through hole with an axially continuous profile. Furthermore, the front end of the cylinder barrel 1a is enlarged to form a mounting threaded hole 1b, allowing the chuck body 2 to be connected to the cylinder 1 via a threaded connection. Therefore, this utility model machined an external threaded section 21 at the rear end of the chuck body 2 for threaded connection with the mounting threaded hole 1b. The chuck sleeve 3 is fitted onto the chuck body 2 in a non-slip manner.
[0023] In the embodiments, as shown Figure 3 As shown, the chuck body 2 of this utility model has an annular shoulder 22 machined at the front end of the external thread section 21. After the chuck body 2 and the cylinder 1 are screwed together, the rear end face of the annular shoulder 22 is positioned and matched with the front end face of the cylinder 1.
[0024] In this embodiment, the chuck body 2 of this invention has four circumferentially spaced holes 2a at 90-degree intervals. Each hole 2a contains a limiting steel ball 4, which can partially protrude into the inner cavity of the chuck body 2. The sleeve of the chuck sleeve 3 has a limiting protrusion 31 formed therein to limit the radial movement space of the limiting steel ball 4. The chuck sleeve 3 can change the radial movement space of the limiting steel ball 4 by sliding backward.
[0025] In the embodiment, the clamp body 2 of this utility model is fitted with a return spring 5 for forcing the clamp sleeve 3 to have a forward movement tendency, and the front end of the clamp body 2 is fitted with a wire retaining ring 6 for preventing the clamp sleeve 3 from falling out.
[0026] The rear end of the return spring 5 of this invention abuts against the front end face of the annular shoulder 22, and the front end of the return spring 5 abuts against the limiting protrusion 31 of the chuck sleeve 3. Under the action of the return spring 5, the front end face of the chuck sleeve 3 is always in contact with the wire retaining ring 6. In this normal state, the length of the chuck sleeve 3 is such that its rear end can cover at least half the width of the annular shoulder 22. This design structure of this invention makes the return spring 5 invisible from the outside, thus making the overall structure cleaner and more aesthetically pleasing.
[0027] In this embodiment, a cylinder liner 7 is fitted onto the circumferential surface of the cylinder 1 at the front-middle section of the corresponding cylinder barrel 1a.
[0028] In this invention, the cylinder 1 has an axially machined return air channel 1c, and the front end of the cylinder barrel 1a is milled with a milling cutter to form a connecting channel 1d for connecting the cylinder barrel 1a and the return air channel 1c. In traditional processes, because the cylinder barrel 1a is machined as a blind hole, radial process holes need to be drilled, and these process holes must be sealed afterward, which is very troublesome. In this invention, because the cylinder barrel 1a is a through hole, and its front end is enlarged to form a mounting screw hole 1b, the connecting channel 1d can be directly milled with a milling cutter or machined with a lathe tool due to the larger hole diameter, making the process much simpler.
[0029] Figure 5 The figure shows a schematic diagram of the assembly structure of the present invention and the handle body. As shown in the figure, the cylinder 1 of the present invention is directly installed at the front end of the handle body 9, and the handle body 9 is convenient for one-handed operation.
[0030] The preferred embodiment of this utility model has been described, and various changes or modifications made by those skilled in the art will not depart from the scope of this utility model.
Claims
1. An improved structure of a pneumatic shovel cylinder, comprising a cylinder (1), a chuck body (2) and a chuck sleeve (3); characterized in that: The cylinder barrel (1a) of the cylinder (1) is a through hole formed by axial through molding, and the front end of the cylinder barrel (1a) is formed with an assembly screw hole (1b) by expanding diameter, the chuck body (2) is connected with the cylinder (1) by threaded connection, and the rear end of the chuck body (2) is processed with an external thread section (21) for threaded connection with the assembly screw hole (1b); the chuck sleeve (3) is detachably sleeved on the chuck body (2).
2. The improvement in a dragline bucket according to claim 1 wherein: An annular shoulder (22) is formed on the chuck body (2) at the front end of the external thread section (21) for positioning cooperation with the front end face of the cylinder (1).
3. The improvement in a dragline bucket according to claim 2 wherein: Four clamping holes (2a) are formed on the chuck body (2) at 90 degrees apart in the circumferential direction, and a limiting steel ball (4) is arranged in each clamping hole (2a), and a limiting convex ring (31) is formed in the sleeve of the chuck sleeve (3) for limiting the radial movement space of the limiting steel ball (4).
4. The improvement in accordance with claim 3 wherein: The chuck body (2) is sleeved with a reset spring (5) for forcing the chuck sleeve (3) to have a forward moving trend, and the front end of the chuck body (2) is clamped with a steel wire stop ring (6) for preventing the chuck sleeve (3) from falling out.
5. The improvement in accordance with claim 4 wherein: When the front end face of the chuck sleeve (3) abuts against the steel wire stop ring (6), the rear end of the chuck sleeve (3) covers at least half the width of the annular shoulder (22).
6. In a gas lift cylinder as defined in claim 5, the improvement wherein: The cylinder (1) is sleeved with a cylinder ring (7) on the circumferential surface corresponding to the middle and front section of the cylinder barrel (1a).
7. An improvement in a gas lift cylinder as defined in claim 6 wherein: An air return channel (1c) is formed in the cylinder (1) in the axial direction, and a connecting channel (1d) for connecting the cylinder barrel (1a) and the air return channel (1c) is formed by milling or turning at the front end in the cylinder barrel (1a).