Pneumatic clamping mechanism

Abstract

The utility model discloses a pneumatic clamping mechanism and relates to the technical field of engraving and milling machines, a movable shaft comprises a fixed shaft fixed in a shell and a movable shaft rotationally connected in the shell, an input shaft is rotationally connected in the fixed shaft, a cavity is reserved in the fixed shaft, one end of the movable shaft is provided with an air channel communicated with the cavity, and the other end of the movable shaft is provided with an air outlet communicated with the air channel. A piston cylinder is movably connected into the movable shaft, a clamping groove is formed in the periphery of the outer portion of the output shaft, and a plurality of steel balls are arranged between the clamping groove and the piston cylinder in a rolling mode. According to the pneumatic clamping mechanism, the air channel is formed in the main shaft, external air is introduced into the main shaft, the piston cylinder is pushed to move through high pressure of the air, the inner diameter of the piston cylinder is different, the steel ball is clamped on the side with the smaller diameter and is extruded, the main shaft and the output shaft are only clamped, and similarly, the steel ball is clamped on the side with the larger diameter and is subjected to pressure relief; the output shaft can be taken out from the main shaft, namely locking and unlocking are achieved in a pneumatic mode, and compared with a bolt fixing mode, more convenience and labor saving are achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of precision engraving machines, in particular to a pneumatic clamping mechanism. Background Art

[0002] The precision engraving machine is a type of CNC machine tool, which is mainly used for non-contact cutting and punching of metal or non-metal plates and pipes. When the precision engraving machine processes the workpiece, it needs to fix the workpiece with a fixture or jig, and then process the surface of the workpiece with the head of the precision engraving machine;

[0003] The fixture or jig of the existing engraving machine is usually installed on the spindle of the engraving machine, and the workpiece is driven by a driving mechanism. The connection between the fixture or jig and the spindle is usually through bolts. The bolt fixing method is very troublesome when the fixture or jig needs to be frequently disassembled and assembled, and due to the frequent disassembly and assembly of the bolts, the bolts also need to be replaced frequently. Utility Model Content

[0004] In view of the deficiencies of the prior art, the utility model provides a pneumatic clamping mechanism to solve the problems raised by the above-mentioned background technology.

[0005] To achieve the above purpose, the utility model is implemented through the following technical solutions: a pneumatic clamping mechanism, including a shell, a moving shaft is installed inside the shell, the moving shaft includes a fixed shaft fixed inside the shell and a moving shaft rotatably connected inside the shell, an input shaft is rotatably connected inside the fixed shaft, the end of the input shaft is fixedly connected to the moving shaft, an output shaft is clamped and fixed inside the moving shaft, a cavity is reserved inside the fixed shaft, an air passage connected to the cavity is opened at one end of the moving shaft, a piston cylinder is movably connected inside the moving shaft, an end cover is fixedly connected to the other end of the moving shaft, the piston cylinder and the end cover are fixedly connected by a plurality of springs, a card slot is opened around the outside of the output shaft, a plurality of steel balls are rollingly arranged between the card slot and the piston cylinder, and a step groove is arranged inside the moving shaft.

[0006] Furthermore, the input shaft and the fixed shaft are connected via a bearing, and the bearing allows the input shaft and the fixed shaft to rotate relative to each other.

[0007] Furthermore, the end of the end cover is fixedly connected to a lower clamping plate, the upper part of the lower clamping plate is fixedly connected to an upper clamping plate by bolts, and the lower clamping plate and the upper clamping plate jointly clamp and fix the workpiece.

[0008] Furthermore, a rotary drive motor is fixedly mounted at the inner bottom end of the shell, the driving end of the rotary drive motor and the input shaft are jointly transmitted through a pulley set, and the end surface of the shell is blocked by a cover plate.

[0009] Furthermore, an air pipe joint is fixedly connected to the end surface of the fixed axis, the air pipe joint is communicated with the cavity, and the air pipe connected to the air pipe joint extends to the outside through the side wall of the shell.

[0010] Furthermore, a space is reserved inside the end cover to allow the piston cylinder to move laterally.

[0011] The utility model provides a pneumatic clamping mechanism. Compared with the prior art, it has the following beneficial effects:

[0012] The pneumatic clamping mechanism sets an air passage inside the main shaft to introduce external air into the main shaft, and pushes the piston cylinder to move by the high pressure of the air. The inner diameter of the piston cylinder is large or small. The steel ball is stuck on the side with smaller diameter, and the steel ball is squeezed, so that the main shaft and the output shaft are just engaged. Similarly, the steel ball is stuck on the side with larger diameter, and the pressure of the steel ball is released, and the output shaft can be taken out from the main shaft. That is, locking and unlocking are performed pneumatically, which is more convenient and labor-saving than bolt fixing. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of the disassembly of the utility model;

[0014] Figure 2 It is a schematic diagram of the assembly structure of the utility model;

[0015] Figure 3 This is a top view of the utility model after assembly;

[0016] Figure 4 This is a front view of the utility model after assembly;

[0017] Figure 5 This is a structural schematic diagram of the movable shaft and the fixed shaft in the utility model from the first viewing angle;

[0018] Figure 6 This is a structural schematic diagram of the movable shaft and the fixed shaft in the utility model from a second viewing angle;

[0019] Figure 7 For this utility model Figure 3 Sectional view of AA in the middle;

[0020] Figure 8 For this utility model Figure 4 Cross-sectional view of the middle BB;

[0021] Fig. 9 This is a schematic diagram of the step groove reserved inside the driving shaft of the utility model.

[0022] Fig.10 It is a schematic diagram of the chamber of the utility model.

[0023] In the figure: 1, housing; 2, moving shaft; 21, input shaft; 22, output shaft; 23, air pipe joint; 24, cavity; 25, airway; 251, chamber; 26, piston cylinder; 27, slot; 28, steel ball; 29, fixed shaft; 210, bearing; 211, step groove; 3, end cover; 4, spring; 5, lower clamping plate; 51, upper clamping plate; 6, rotating drive motor; 7, pulley assembly; 8, cover plate; 9, workpiece. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0025] See also Figure 1-8 The utility model provides a technical solution: a pneumatic clamping mechanism, including a shell 1, a moving shaft 2 is installed inside the shell 1, the moving shaft 2 includes a fixed shaft 29 fixed inside the shell 1 and the moving shaft 2 rotatably connected inside the shell 1, the fixed shaft 29 is rotatably connected with an input shaft 21 inside (the input shaft 21 and the fixed shaft 29 are connected by a bearing 210, and the bearing 210 allows the input shaft 21 and the fixed shaft 29 to rotate relative to each other), the end of the input shaft 21 is fixedly connected to the moving shaft 2, an output shaft 22 is clamped and fixed inside the moving shaft 2, a cavity 24 is reserved inside the fixed shaft 29, an air passage 25 connected to the cavity 24 is opened at one end of the moving shaft 2, a piston cylinder 26 is movably connected inside the moving shaft 2, the other end of the moving shaft 2 is fixedly connected with an end cover 3, and the piston cylinder 26 and the end cover 3 are fixedly connected by a plurality of springs 4 (the end cover 3 A space is reserved inside to allow the piston cylinder 26 to move laterally), a groove 27 is opened around the outside of the output shaft 22, and a number of steel balls 28 are rolled between the groove 27 and the piston cylinder 26. A step groove 211 is provided inside the moving shaft 2, and a lower clamping plate 5 is fixedly connected to the end of the end cover 3, and an upper clamping plate 51 is fixedly connected to the upper part of the lower clamping plate 5 by bolts. The lower clamping plate 5 and the upper clamping plate 51 jointly clamp and fix a workpiece 9, and a rotary drive motor 6 is fixedly installed at the bottom end of the inner part of the shell 1, and the driving end of the rotary drive motor 6 and the input shaft 21 are jointly transmitted through a pulley group 7. The end face of the shell 1 is blocked by a cover plate 8, and an air pipe joint 23 is fixedly connected to the end face of the fixed shaft 29. The air pipe joint 23 is communicated with the cavity 24, and the air pipe connected to the air pipe joint 23 extends to the outside through the side wall of the shell 1 (the air pipe is not shown in the figure).

[0026] Please read Fig.10As shown, a chamber 251 is provided between the air passage 25 and the piston cylinder 26, and the air pressure in the cavity 24 enters the chamber 251 from the air passage 25, that is to say, the distance of the chamber 251 is very small before, and the piston cylinder 26 is pushed by the air pressure to enlarge the small cavity of the chamber 251, and when there is no air pressure, the pressure is released by the spring 4 to reduce the size of the chamber 251.

[0027] When in use, first place the edge of the workpiece 9 on the lower clamping plate 5, then fit the upper clamping plate 51 to the upper surface edge of the workpiece 9, and then use bolts to fix the upper clamping plate 5 and the lower clamping plate 51 together to complete the fixation of the workpiece 9;

[0028] After the workpiece 9 is fixed, the rotary drive motor 6 is started to drive the pulley set 7 to rotate, thereby driving the input shaft 21 to rotate. Since the input shaft 21 is connected to the fixed shaft 29 through the bearing 210, and the end of the input shaft 21 is fixedly connected to the dynamic shaft 2, when the input shaft 21 rotates, it will drive the dynamic shaft 2 and the output shaft 22 to rotate synchronously, thereby driving the workpiece 9 to rotate through the end cover 3, the lower clamping plate 5, and the upper clamping plate 51;

[0029] It is necessary to release the output shaft 22 from the driving shaft 2. When the output shaft 22 is removed from the driving shaft 2, gas is injected into the air pipe joint 23. The gas enters the air passage 25 to form a high pressure, which pushes the piston cylinder 26 to move to the right (with a pressure of 1.5 V). Figure 7 As an example, during the rightward movement, the piston cylinder 26 will compress the spring 4, and on the other hand, the piston cylinder 26 will move rightward, and the step groove 211 will also move with it. Before the movement, the side with a smaller diameter has always squeezed the steel ball 28, so that the steel ball 28 is stuck in the inside of the slot 27. Under the action of pressure, the output shaft 22 cannot be pulled out from the inside of the driven shaft 2. However, when the position of the side with a larger diameter (the step groove 211) corresponds to the steel ball 28, due to the increase in diameter, the steel ball 28 is no longer squeezed by the piston cylinder 26, and the steel ball 28 will be out of the slot 27. At this time, it will be unlocked, and the output shaft 22 can be pulled out from the inside of the driven shaft 2.

Claims

1. A pneumatic clamping mechanism, comprising a housing (1), characterized in that: A moving shaft (2) is installed inside the housing (1), and the moving shaft (2) comprises a fixed shaft (29) fixed inside the housing (1) and a moving shaft (2) rotatably connected inside the housing (1); an input shaft (21) is rotatably connected inside the fixed shaft (29); the end of the input shaft (21) is fixedly connected to the moving shaft (2); an output shaft (22) is clamped and fixed inside the moving shaft (2); a cavity (24) is reserved inside the fixed shaft (29); one end of the moving shaft (2) is provided with a The movable shaft (2) is provided with an air passage (25) connected to the cavity (24); a piston cylinder (26) is movably connected inside the movable shaft (2); an end cover (3) is fixedly connected to the other end of the movable shaft (2); the piston cylinder (26) and the end cover (3) are fixedly connected via a plurality of springs (4); a clamping groove (27) is provided around the outside of the output shaft (22); a plurality of steel balls (28) are rotatably arranged between the clamping groove (27) and the piston cylinder (26); and a step groove (211) is provided inside the movable shaft (2).

2. A pneumatic clamping mechanism according to claim 1, characterized in that: The input shaft (21) and the fixed shaft (29) are connected via a bearing (210), and the bearing (210) enables relative rotation between the input shaft (21) and the fixed shaft (29).

3. A pneumatic clamping mechanism according to claim 1, characterized in that: The end of the end cover (3) is fixedly connected to a lower clamping plate (5), the upper part of the lower clamping plate (5) is fixedly connected to an upper clamping plate (51) via bolts, and the lower clamping plate (5) and the upper clamping plate (51) jointly clamp and fix a workpiece (9).

4. A pneumatic clamping mechanism according to claim 1, characterized in that: A rotary drive motor (6) is fixedly mounted on the inner bottom end of the housing (1); the drive end of the rotary drive motor (6) and the input shaft (21) are jointly driven via a pulley set (7); and the end surface of the housing (1) is sealed via a cover plate (8).

5. The pneumatic clamping mechanism according to claim 1, characterized in that: The end surface of the fixed shaft (29) is fixedly connected to a trachea joint (23), the trachea joint (23) is in communication with the cavity (24), and the trachea connected to the trachea joint (23) extends to the outside through the side wall of the housing (1).

6. A pneumatic clamping mechanism according to claim 1, characterized in that: A space is reserved inside the end cover (3) to allow the piston cylinder (26) to move laterally.

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