CN114425713A

CN114425713A - Automatic tool changing device for machining center

Info

Publication number: CN114425713A
Application number: CN202011187969.6A
Authority: CN
Inventors: 沈周; 李丹绮
Original assignee: Changzhou Engineering and Technology Institute of Jiangsu University
Current assignee: Changzhou Engineering and Technology Institute of Jiangsu University
Priority date: 2020-10-29
Filing date: 2020-10-29
Publication date: 2022-05-03

Abstract

The invention discloses an automatic tool changing device for a machining center, and relates to the technical field of machining centers. The invention comprises a fixed sleeve, wherein a central shaft is rotatably connected between two ends of the inner wall of the fixed sleeve; the bottom end of the central shaft is fixed with a central gear; the circumferential side surface of the bottom end of the fixed sleeve is provided with a support arm in an annular array; the end part of the supporting arm is rotationally connected with a planetary gear meshed with the central gear; the end part of the supporting arm is rotationally connected with an annular frame matched with the planetary gear; the annular arrays on the peripheral side surface of the annular frame are provided with connecting loop bars; the side surface of the inner periphery of the connecting loop bar is sleeved with a tool rest. According to the invention, through the structural design of planetary gear transmission, the central shaft drives the central gear to be meshed with the planetary gear for transmission when rotating, so that the annular frame rotates around the fixed sleeve, and drives the tool rest to translate under the action of the cylinder for automatic tool changing, thereby avoiding the deviation of the tool when rotating and increasing the rotating precision of the tool when changing the tool.

Description

Automatic tool changing device for machining center

Technical Field

The invention belongs to the technical field of machining centers, and particularly relates to an automatic tool changing device for a machining center.

Background

The machining center is developed from a numerical control milling machine, the machining center is different from the numerical control milling machine in that the machining center has the capability of automatically exchanging machining tools, and the machining tools with different purposes are installed on the tool magazine, so that the machining tools on the main shaft can be changed through the automatic tool changing device in one-time clamping, and multiple machining functions are realized.

An automatic tool changer disclosed in Chinese patent CN210909152U (application number: 201921533022.9) is disclosed, in which a stepping motor drives and controls a cutter head to rotate, so that an empty cutter position of the cutter head stays at a cutter changing position; processing a vacancy from an original tool chuck on a main shaft of the center to a cutter head, withdrawing the main shaft, and fixing the original tool chuck on the main shaft on the cutter head; the stepping motor drives and controls the cutter head to rotate, so that the cutter position of the target cutter stays at the cutter changing position; the cutter changing position is reached on the main shaft of the machining center, and automatic positioning and clamping of the cutter holder head assembly on the main shaft are realized.

SUMMARY OF THE PATENT FOR INVENTION

The invention aims to provide an automatic tool changer for a machining center, which solves the problem that the existing automatic tool changer is easy to deviate by adopting a structural design of planetary gear transmission through the matched use of a fixed sleeve, a central shaft, a planetary gear, an annular frame and a guide frame.

In order to solve the technical problems, the invention is realized by the following technical scheme:

the invention relates to an automatic tool changer for a machining center, which comprises a fixed sleeve,

a central shaft is rotatably connected between the two ends of the inner wall of the fixed sleeve through a ball bearing; a central gear is fixed at the bottom end of the central shaft; the circumferential side surface of the bottom end of the fixed sleeve is provided with a support arm in an annular array; the end part of the supporting arm is rotatably connected with a planetary gear meshed with the central gear through a ball bearing; the end parts of the three supporting arms are rotatably connected with an annular frame; the inner peripheral side surface of the annular frame is in meshing transmission with the planetary gear; the annular arrays on the peripheral side surfaces of the annular frames are provided with connecting loop bars; the side surface of the inner periphery of the connecting sleeve rod is sleeved with a tool rest; the cylinder is fixed on the peripheral side surface of the fixed sleeve; and a push plate is fixed at the end part of the piston rod of the air cylinder.

Furthermore, tooth grooves which are in meshed transmission with the planet gears are formed in the annular arrays on the inner peripheral side surfaces of the annular frames; and the side surface of the inner periphery of the annular frame and the top of the tooth socket are provided with limiting ring grooves.

Furthermore, one end of each support arm, which is far away from the fixing sleeve, is fixed with a connecting support rod matched with the limiting ring groove.

Further, the tool rest is of a U-shaped structure; the side surface of the periphery of the tool rest is provided with an insert rod matched with the connecting sleeve rod; a spring is fixed at the end part of the inserted link and between the inner end parts of the connecting links; and a baffle matched with the push plate is fixed at the top of the knife rest.

Furthermore, a mounting flange is fixed to the peripheral side face of one end, far away from the supporting arm, of the fixing sleeve.

The invention has the following beneficial effects:

according to the invention, through the matched use of the fixed sleeve, the central shaft, the planetary gear, the annular frame and the guide frame, the structural design of planetary gear transmission is adopted, the central shaft drives the central gear to be meshed and meshed with the planetary gear for transmission when rotating, so that the annular frame rotates around the fixed sleeve, and drives the tool rest to translate under the action of the air cylinder for automatic tool changing, the tool is prevented from shifting when rotating, the rotating precision of the tool during tool changing is increased, and the requirements of actual production and processing are met.

Of course, it is not necessary for any product that embodies the present invention to achieve all of the above-described advantages simultaneously.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention patent, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without creative efforts.

FIG. 1 is a schematic structural view of an automatic tool changer for a machining center according to the present invention;

FIG. 2 is a schematic structural view of the fixing sleeve;

FIG. 3 is a schematic view of the ring frame illustrating the structure of the central shaft;

FIG. 4 is a schematic view of the construction of the tool holder;

FIG. 5 is a schematic view of the construction of the tool holder;

in the drawings, the components represented by the respective reference numerals are listed below:

1-a fixed sleeve, 2-a central shaft, 3-a planetary gear, 4-an annular frame, 5-a tool rest, 6-a cylinder, 7-a push plate, 101-a support arm, 102-a connecting support rod, 103-a mounting flange, 201-a central gear, 401-a connecting sleeve rod, 402-a tooth groove, 403-a limiting ring groove, 501-an inserted rod, 502-a spring and 503-a baffle plate.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given in the present patent application without inventive step, shall fall within the scope of protection of the present patent application.

Referring to fig. 1-5, an automatic tool changer for a machining center according to the present invention includes a fixing sleeve 1,

a central shaft 2 is rotatably connected between the two ends of the inner wall of the fixed sleeve 1 through a ball bearing; the bottom end of the central shaft 2 is fixed with a central gear 201; the circumferential side surfaces of the bottom end of the fixed sleeve 1 are provided with supporting arms 101 in an annular array; the end part of the supporting arm 101 is rotatably connected with a planetary gear 3 meshed with the sun gear 201 through a ball bearing; the end parts of the three supporting arms 101 are rotatably connected with an annular frame 4; the inner peripheral side surface of the annular frame 4 is in meshing transmission with the planetary gear 3; the annular arrays on the peripheral side of the annular frame 4 are provided with connecting loop bars 401; the side surface of the inner periphery of the connecting sleeve rod 401 is sleeved with a tool rest 5; the peripheral side surface of the fixed sleeve 1 is fixed with a cylinder 6; a push plate 7 is fixed at the end part of the piston rod of the cylinder 6.

Wherein, the annular arrays on the inner peripheral side surface of the annular frame 4 are all provided with tooth grooves 402 which are mutually meshed with the planet gears 3 for transmission; the inner peripheral side of the annular frame 4 and the top of the tooth groove 402 are provided with a limit ring groove 403.

Wherein, one end of each of the three supporting arms 101, which is far away from the fixing sleeve 1, is fixed with a connecting stay bar 102 which is matched with the limit ring groove 403.

Wherein, the tool rest 5 is in a U-shaped structure; the side surface of the periphery of the tool rest 5 is provided with an insert rod 501 matched with the connecting sleeve rod 401; a spring 502 is fixed at the end of the inserted link 501 and between the inner ends of the connecting loop bars 401; the top of the tool rest 5 is fixed with a baffle 503 which is matched with the push plate 7.

Wherein, a mounting flange 103 is fixed on the peripheral side surface of one end of the fixing sleeve 1 far away from the supporting arm 101.

One specific application of this embodiment is: fixed sleeve 1 passes through mounting flange and frame fixed mounting, during the tool changing, center pin 2 rotates under driving motor's effect, the sun gear that is located 2 bottoms of center pin and the meshing transmission of planetary gear 3, the annular frame 4 that is located to connect vaulting pole 102 tip rotation connection passes through tooth's socket 402 and the meshing transmission of planetary gear 3, it is rotatory to make annular frame 4 rotate wholly and drive knife rest 5, cylinder 6 stretches out and drives push pedal 7 and laminates with the baffle 503 at knife rest 5 top each other, it carries out the tool changing to make guide frame 5 drive the cutter translation, cylinder 6 shrink back, knife rest 5 moves back under the recovery operation of spring 502 and retrieves the cutter, avoid the cutter to produce the skew when rotating, pivoted precision when having increased the cutter tool changing, the requirement of actual production processing has been satisfied.

In the description herein, reference to the description of "one embodiment," "an example," "a specific example" or the like means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the patent. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The above disclosure of the preferred embodiments of the present patent is intended only to aid in the interpretation of the patent. The preferred embodiments are not intended to be exhaustive or to limit the invention to the precise embodiments disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and its practical applications, to thereby enable others skilled in the art to best understand and utilize the invention. The present patent is limited only by the claims and their full scope and equivalents.

Claims

1. The utility model provides an automatic tool changer is used to machining center, includes fixed sleeve (1), its characterized in that:

a central shaft (2) is rotatably connected between the two ends of the inner wall of the fixed sleeve (1) through a ball bearing; a central gear (201) is fixed at the bottom end of the central shaft (2); the circumferential side surface of the bottom end of the fixed sleeve (1) is provided with a support arm (101) in an annular array; the end part of the supporting arm (101) is rotatably connected with a planetary gear (3) meshed with the sun gear (201) through a ball bearing; the end parts of the plurality of supporting arms (101) are rotatably connected with an annular frame (4); the inner peripheral side surface of the annular frame (4) is in meshing transmission with the planetary gear (3); the annular arrays on the peripheral side surface of the annular frame (4) are provided with connecting loop bars (401); the side surface of the inner periphery of the connecting loop bar (401) is sleeved with a tool rest (5); a cylinder (6) is fixed on the peripheral side surface of the fixed sleeve (1); and a push plate (7) is fixed at the end part of the piston rod of the cylinder (6).

2. The automatic tool changer for machining centers as claimed in claim 1, characterized in that the annular arrays of the inner peripheral side surfaces of the annular holders (4) are provided with tooth grooves (402) for meshing transmission with the planetary gears (3); and a limiting ring groove (403) is arranged on the inner peripheral side surface of the annular frame (4) and is positioned at the top of the tooth groove (402).

3. The automatic tool changer for machining centers as claimed in claim 2, characterized in that the ends of the support arms (101) remote from the fixing sleeve (1) are each fixed with a connecting brace (102) which is matched with the limiting ring groove (403).

4. An automatic tool changer for machining centers according to claim 1, characterized in that the tool holder (5) is of a U-shaped configuration; the side surface of the periphery of the tool rest (5) is provided with an inserted rod (501) matched with the connecting sleeve rod (401); a spring (502) is fixed at the end part of the inserted link (501) and between the inner end parts of the connecting sleeve rods (401); and a baffle (503) matched with the push plate (7) is fixed at the top of the tool rest (5).

5. The automatic tool changer for the machining center according to claim 1, characterized in that a mounting flange (103) is fixed to the peripheral side of one end of the fixing sleeve (1) away from the support arm (101).