Zero-point positioning clamp for CNC (computer numerical control) machine tool

Abstract

The zero-point positioning clamp for the CNC machine tool comprises a flange plate, a shell and a clamp tray connected to the upper surface of the shell in a clamped mode, a connecting base is connected to the upper surface of the shell in a sealed and bolted mode, a piston is arranged on the upper surface of the connecting base, and an air pipe connector is connected to the outer arc face of the shell in a sealed mode. The other end of the air pipe connector is connected with the piston in a sealed mode, a blind rivet is arranged in the piston, a penetrating opening corresponding to the blind rivet is formed in the upper surface of the clamp tray in a penetrating mode, a plurality of sets of installation holes are formed in the upper surface of the clamp tray, and the blind rivet is arranged to be conical and can limit the freedom degree of linear motion of the clamp tray in the X direction and the Y direction. And after the gas pipe joint closes the gas, the piston is jacked back under the action of the stretching force of the spring, the gas enters the cavity from the top end of the piston to increase the locking force of the spring, and at the moment, the plurality of groups of steel balls are in a clamping state, so that the clamp tray is fixed, and the overall positioning precision and use stability of the clamp are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of zero point positioning fixtures, in particular to a zero point positioning fixture for a CNC numerically controlled machine tool. Background Art

[0002] CNC machine tools are short for Computer numerical control machine tools, which are automated machine tools equipped with a program control system. The control system can logically process programs specified by control codes or other symbolic instructions, decode them, express them in coded numbers, and input them into the CNC device through information carriers. After calculation and processing, the CNC device sends out various control signals to control the action of the machine tool, and automatically processes the parts according to the shape and size required by the drawing. The zero point positioning fixture is a unique positioning and locking device that can keep the workpiece from one station to another, from one process to another, or from one machine tool to another. The zero point always remains unchanged. This can save the auxiliary time of re-adjusting the zero point, ensure the continuity of work, and improve work efficiency;

[0003] However, the current zero-point quick-change fixtures generally have low positioning accuracy and poor stability in use. When the fixture needs to be replaced, the staff is often required to use tools to buckle the fixture out and then replace it, which reduces the furniture replacement rate. Therefore, we need to propose a zero-point positioning fixture for CNC machine tools. Utility Model Content

[0004] The purpose of the utility model is to provide a zero-point positioning fixture for CNC machine tools. By setting the pull pin to a cone, the pull pin can limit the freedom of linear motion of the fixture tray in the X and Y directions. After the gas is closed at the air pipe joint, the piston is pushed back under the action of the spring tension, and the gas enters the cavity from the top of the piston to increase the locking force of the spring. At this time, several groups of steel balls are in a clamping state, thereby fixing the fixture tray to solve the problems raised in the above-mentioned background technology.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a zero-point positioning fixture for CNC machine tools, comprising a flange, a shell and a fixture tray clamped to the upper surface of the shell, the upper surface of the shell is sealingly bolted with a connecting seat, the upper surface of the connecting seat is provided with a piston, the outer arc surface of the shell is sealingly connected to a trachea joint, the other end of the trachea joint is sealingly connected to the piston, a rivet is provided inside the piston, and a through-opening corresponding to the rivet is opened on the upper surface of the fixture tray, and a plurality of groups of mounting holes are opened on the upper surface of the fixture tray.

[0006] Preferably, a mounting column is arranged on the upper surface of the connecting seat and located inside the piston, a plurality of groups of steel balls are movably arranged inside the mounting column, and a plurality of groups of springs are arranged on the upper surface of the connecting seat and located on the side of the mounting column.

[0007] Preferably, two groups of sealing rings are clamped on the outer arc surface of the piston, and two groups of clamping grooves corresponding to the sealing rings are opened on the outer arc surface of the piston.

[0008] Preferably, a locking sleeve corresponding to the pull stud is provided on the upper surface of the mounting column and located inside the piston, and a locking groove corresponding to the locking sleeve is provided on the outer arc surface of the pull stud.

[0009] Preferably, a plurality of groups of lower clutch teeth are fixedly mounted on the upper surface of the housing, and upper clutch teeth corresponding to the plurality of groups of lower clutch teeth are fixedly mounted on the lower surface of the fixture tray.

[0010] Preferably, the upper surface of the connecting seat is threadedly provided with a plurality of sets of locking screws.

[0011] Compared with the prior art, the beneficial effects of the utility model are:

[0012] 1. The utility model sets the pull nail to be conical, which can limit the freedom of linear movement of the fixture tray in the X and Y directions. After the gas is turned off at the air pipe joint, the piston is pushed back under the action of the spring tension, and the gas enters the cavity from the top of the piston to increase the locking force of the spring. At this time, several groups of steel balls are in a clamping state, thereby fixing the fixture tray, thereby improving the overall positioning accuracy and use stability of the fixture.

[0013] 2. In the utility model, the gas enters the internal cavity of the piston through the air pipe joint. Due to the sealing setting, the air pressure inside the cavity is greater than the elastic force of the spring. At this time, the piston moves upward to compress the spring. When the piston rises to the highest point, several groups of steel balls are in a relaxed state, thereby achieving the purpose of loosening the rivet, and then achieving the effect of quickly replacing the rivet and the upper fixture tray, thereby increasing the rate of replacing the fixture tray.

[0014] Other features and advantages of the utility model will be described in the following description, and partly become apparent from the description, or understood by implementing the invention. The purpose and other advantages of the utility model can be realized and obtained by the structures indicated in the description and the drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0016] Figure 2 It is an exploded view of the overall structure of the utility model;

[0017] Figure 3This is a schematic diagram of the structure below the fixture tray of the utility model;

[0018] Figure 4 This is a schematic diagram of the internal structure of the piston of the utility model.

[0019] In the figure: 1. flange; 2. shell; 3. air pipe joint; 4. lower clutch tooth; 5. fixture tray; 6. rivet; 7. mounting hole; 8. upper clutch tooth; 9. spring; 10. piston; 11. snap-in groove; 12. through-hole; 13. sealing ring; 14. locking screw; 15. steel ball; 16. connecting seat; 17. locking sleeve. DETAILED DESCRIPTION

[0020] 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.

[0021] The utility model provides: a zero point positioning fixture for a CNC numerically controlled machine tool, such as Figure 1-4 As shown, it includes a flange 1, a shell 2 and a fixture tray 5 clamped on the upper surface of the shell 2, the upper surface of the shell 2 is sealed and bolted with a connecting seat 16, the upper surface of the connecting seat 16 is provided with a piston 10, the outer arc surface of the shell 2 is sealed and connected with a trachea joint 3, the other end of the trachea joint 3 is sealed and connected with the piston 10, a rivet 6 is provided inside the piston 10, and a through hole 12 corresponding to the rivet 6 is opened through the upper surface of the fixture tray 5, and a plurality of mounting holes 7 are opened on the upper surface of the fixture tray 5, and the gas enters the internal cavity of the piston 10 through the trachea joint 3. Due to the sealing setting, the air pressure inside the cavity is The elastic force is greater than the spring 9. At this time, the piston 10 moves upward to compress the spring 9. When the piston 10 rises to the highest point, several groups of steel balls 15 are in a relaxed state, thereby achieving the purpose of loosening the rivet 6, and then achieving the effect of quickly replacing the rivet 6 and the upper clamp tray 5. The rivet 6 is set to be conical, and the rivet 6 can limit the freedom of linear movement of the clamp tray in the X and Y directions. After the gas is turned off by the air pipe joint 3, the piston 10 is pushed back under the action of the tension of the spring 9, and the gas enters the cavity from the top of the piston 10 to increase the locking force of the spring 9. At this time, several groups of steel balls 15 are in a clamped state, thereby fixing the clamp tray 5.

[0022] Preferably, a mounting column is provided on the upper surface of the connecting seat 16 and located inside the piston 10, and a plurality of groups of steel balls 15 are movably provided inside the mounting column, and a plurality of groups of springs 9 are provided on the upper surface of the connecting seat 16 and located on the side of the mounting column. The plurality of groups of steel balls 15 are provided to clamp or loosen the rivet 6, thereby increasing the stability of the connection of the rivet 6, and the plurality of groups of springs 9 are provided to provide an upward elastic force to the piston 10, thereby preventing the piston 10 from moving downward and getting stuck under the gravity of the rivet 6 and the upper structure, resulting in the need to use a tool to pry up the rivet 6 before removing it, thereby reducing the replacement rate of the fixture tray 5.

[0023] Furthermore, the outer arc surface of the piston 10 is clamped with two sets of sealing rings 13, and the outer arc surface of the piston 10 is provided with two sets of clamping grooves 11 corresponding to the sealing rings 13, and the two sets of sealing rings 13 are clamped into the inside of the clamping grooves 11, thereby ensuring the sealing strength inside the piston 10.

[0024] Furthermore, a locking sleeve 17 corresponding to the rivet 6 is provided on the upper surface of the mounting column and inside the piston 10, and a locking groove corresponding to the locking sleeve 17 is provided on the outer arc surface of the rivet 6. The rivet 6 is configured to be conical, and a locking buckle corresponding to the locking groove on the outer arc surface of the conical rivet 6 is fixedly provided inside the locking sleeve 17.

[0025] It is worth mentioning that several groups of lower clutch teeth 4 are fixedly installed on the upper surface of the shell 2, and several groups of upper clutch teeth 8 corresponding to the lower clutch teeth 4 are fixedly installed on the lower surface of the clamp tray 5. Several groups of lower clutch teeth 4 and upper clutch teeth 8 are set, and several groups of lower clutch teeth 4 clamp several groups of upper clutch teeth 8, thereby further preventing the clamp tray 5 from rotating.

[0026] Specifically, a plurality of locking screws 14 are threadedly disposed on the upper surface of the connection seat 16 , and the connection seat 16 is connected to the housing 2 via the plurality of locking screws 14 .

[0027] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A zero point positioning fixture for CNC machine tools, characterized in that: The invention comprises: a flange (1), a shell (2) and a fixture tray (5) clamped on the upper surface of the shell (2); the upper surface of the shell (2) is sealingly bolted with a connecting seat (16); the upper surface of the connecting seat (16) is provided with a piston (10); the outer arc surface of the shell (2) is sealingly connected with a trachea joint (3); the other end of the trachea joint (3) is sealingly connected to the piston (10); a rivet (6) is provided inside the piston (10); a through opening (12) corresponding to the rivet (6) is provided on the upper surface of the fixture tray (5); and a plurality of groups of mounting holes (7) are provided on the upper surface of the fixture tray (5).

2. The zero point positioning fixture for CNC machine tools according to claim 1, characterized in that: A mounting column is arranged on the upper surface of the connecting seat (16) and located inside the piston (10), a plurality of groups of steel balls (15) are movably arranged inside the mounting column, and a plurality of groups of springs (9) are arranged on the upper surface of the connecting seat (16) and located on the side of the mounting column.

3. The zero point positioning fixture for CNC machine tools according to claim 2, characterized in that: Two groups of sealing rings (13) are clamped on the outer arc surface of the piston (10), and two groups of clamping grooves (11) corresponding to the sealing rings (13) are formed on the outer arc surface of the piston (10).

4. The zero point positioning fixture for CNC machine tools according to claim 2, characterized in that: A locking sleeve (17) corresponding to the pull pin (6) is provided on the upper surface of the installation column and located inside the piston (10), and a locking groove corresponding to the locking sleeve (17) is provided on the outer arc surface of the pull pin (6).

5. The zero point positioning fixture for CNC machine tools according to claim 1, characterized in that: A plurality of groups of lower clutch teeth (4) are fixedly mounted on the upper surface of the housing (2), and upper clutch teeth (8) corresponding to the plurality of groups of lower clutch teeth (4) are fixedly arranged on the lower surface of the fixture tray (5).

6. The zero point positioning fixture for CNC machine tools according to claim 1, characterized in that: The upper surface of the connection seat (16) is threadedly provided with a plurality of sets of locking screws (14).

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