Tail end connecting structure of machine tool spindle

Abstract

The utility model discloses a tail end connecting structure of machine tool main shaft, including main shaft box, main shaft, nut and connecting component, the nut is sleeved in the outside of main shaft and is connected with main shaft box, the connecting component sets up in the tail end of main shaft, the inside of connecting component is equipped with the first inner hole and the second inner hole along the axial direction and is equipped with the shaft shoulder part between both, the first inner hole is sleeved in the outside of the tail end of main shaft and is connected through the first key block between both, the nut is equipped with a plurality of first axial thread holes along its circumferential direction interval, the inside of connecting component is equipped with a plurality of second axial thread holes along the circumferential direction interval, a plurality of first thread hole and second thread hole are connected through first bolt one to one corresponding, the utility model sets up the keyway in the tail end of main shaft, and is connected with connecting component through the key block and bolt, need not setting up the shaft shoulder on the main shaft, can be adapted to the occasion of having specific requirement to the main shaft wall thickness under the premise of ensuring the structure strength of main shaft.

Description

Technical Field

[0001] This utility model relates to the field of machine tool spindle installation technology, and in particular to a tail end connection structure for a machine tool spindle. Background Technology

[0002] Depending on the specific requirements, the tail end of a machine tool spindle is typically connected to various mechanical structures, such as pulleys that serve as drive components or hydraulic cylinder connecting discs that serve as tool changing components. These structures are generally fixedly connected to the tail end of the spindle via key connections.

[0003] However, in practical applications, customers often put forward various different requirements, such as specific requirements for the diameter and wall thickness of the spindle, especially the wall thickness cannot be too large, which imposes restrictions on the connection structure of the spindle.

[0004] In existing technologies, such as Figure 1 As shown, when the spindle 1' is connected to the pulley 2', the pulley 2' is sleeved on the outside of the spindle 1', with its front end abutting against the shoulder 3' on the spindle 1', and its rear end locked by the nut assembly 4'. At this time, the wall thickness h of the spindle 1' is relatively large, leaving room for machining the shoulder 3'. In some cases, when a smaller wall thickness h is required, it is not possible to machine the shoulder 3' on the spindle 1', nor can a keyway be set, otherwise the structural strength of the spindle 1' will be affected.

[0005] Therefore, it is necessary to design a new connection structure to solve the problem of connecting with other structures when the spindle wall thickness is small. Utility Model Content

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A tail-end connection structure for a machine tool spindle includes a spindle housing, a spindle, a nut, and a connecting component. The spindle is rotatably mounted in the spindle housing along the axial direction. The nut is sleeved on the outside of the spindle and connected to the spindle housing. The connecting component is located at the tail end of the spindle. The connecting component has a first inner hole and a second inner hole that pass through along the axial direction, with a shoulder between them. The first inner hole is sleeved on the outside of the tail end of the spindle and the two are connected by a first key block. The nut has a plurality of first axial threaded holes spaced apart along its circumference. The connecting component has a plurality of second axial threaded holes spaced apart along the circumference. The plurality of first axial threaded holes and second axial threaded holes are connected one-to-one by a first bolt.

[0008] Furthermore, a first keyway is provided on the outer wall of the tail end of the spindle, and a second keyway is provided on the inner wall of the first inner hole. The first keyway and the second keyway are connected together to a first key block.

[0009] Furthermore, a third keyway is provided radially on the side wall of the second inner hole at the position behind the second keyway. A second key block is provided in the third keyway. A countersunk hole is provided on the upper side of the second key block. A second bolt is provided in the countersunk hole. The second bolt is connected to a third threaded hole on the connecting component. A fourth threaded hole is provided on the lower side of the second key block. A first set screw is provided in the fourth threaded hole. The front end of the first set screw abuts against the first key block.

[0010] Furthermore, the inner ring of the nut is threaded to the outer circle of the spindle, and the side of the nut is threaded to the end of the spindle box.

[0011] Furthermore, the nut has a fifth threaded hole on its top end face, and a second set screw is provided in the fifth threaded hole. The lower end of the second set screw abuts against the outer wall of the spindle.

[0012] Compared with the prior art, the beneficial effects of this utility model are:

[0013] This invention features a keyway at the tail end of the spindle, which is connected to the connecting components via a key block and bolts. This eliminates the need for a shoulder on the spindle, ensuring the structural strength of the spindle while adapting to applications with specific requirements for spindle wall thickness, thus improving the adaptability of the spindle connection structure. Attached Figure Description

[0014] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0015] Figure 1 This is an axial structural cross-sectional view of the prior art;

[0016] Figure 2 This is an axial structural cross-sectional view of the present invention;

[0017] Figure 3 This is an axial structural cross-sectional view of the connecting component in this utility model;

[0018] Figure 4 This is a partial structural diagram of the end face of the connecting component in this utility model;

[0019] Figure 5 This is a schematic diagram of the end face structure of the second key block in this utility model.

[0020] Figure label:

[0021] 1'-Spindle, 2'-Pulley, 3'-Shoulder, 4'-Nut assembly;

[0022] 1-Spindle box, 2-Spindle, 21-First keyway, 3-Nut, 31-First axial threaded hole, 32-Fifth threaded hole, 4-Connecting component, 41-Second axial threaded hole, 42-First inner hole, 43-Second inner hole, 44-Shoulder, 45-Second keyway, 46-Third keyway, 47-Third threaded hole, 5-First bolt, 6-Second set screw, 7-First key block, 8-Second key block, 81-Counterhole, 82-Fourth threaded hole, 9-Second bolt, 10-First set screw. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0024] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0025] Furthermore, the use of terms such as "first" and "second" in this utility model is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features.

[0026] In the description of the embodiments, unless otherwise expressly specified and limited, the terms "set," "connect," etc., should be interpreted broadly. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or a connection through an intermediate medium, or it can be a connection within 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.

[0027] like Figure 2 As shown, the tail end connection structure of the machine tool spindle in this embodiment includes a spindle box 1, a spindle 2, a nut 3, and a connecting component 4. The spindle 2 is rotatably disposed in the spindle box 1 along the axial direction. The structure of the spindle box 1 and the connection method with the spindle 2 are conventional technical means in the art. The connecting component 4 can be a pulley, a hydraulic cylinder connecting plate, or other commonly used structures.

[0028] Nut 3 is sleeved on the outside of spindle 2 and connected to spindle box 1. Specifically, the inner ring of nut 3 is threaded to the outer circle of spindle 2, and the side of nut 3 is threaded to the end of spindle box 1.

[0029] The connecting component 4 is located at the tail end of the spindle 2. Specifically, the nut 3 is provided with a plurality of first axial threaded holes 31 spaced apart along its circumference, and the connecting component 4 is provided with a plurality of second axial threaded holes 41 spaced apart along its circumference. The plurality of first axial threaded holes 31 and second axial threaded holes 41 are connected one-to-one by the first bolt 5.

[0030] The top end face of the nut 3 is provided with a fifth threaded hole 32, and a second set screw 6 is provided in the fifth threaded hole 32. The lower end of the second set screw 6 abuts against the outer wall of the main shaft 2.

[0031] Combination Figures 3-4 As shown, the connecting component 4 has a through first inner hole 42 and a second inner hole 43 along the axial direction, and a shoulder 44 is provided between the two. The first inner hole 42 is sleeved on the outer side of the tail end of the spindle 2 and the two are connected by a first key block 7. Specifically, a first keyway 21 is provided on the outer wall of the tail end of the spindle 2, and a second keyway 45 is provided on the inner wall of the first inner hole 42. The first keyway 21 and the second keyway 45 are connected together by the first key block 7.

[0032] A third keyway 46 is provided radially on the side wall of the second inner hole 43 at the position behind the second keyway 45, and a second key block 8 is provided in the third keyway 46.

[0033] Combination Figure 5 As shown, the second key block 8 has a countersunk hole 81 on its upper side, and a second bolt 9 is provided in the countersunk hole 81. The second bolt 9 is connected to the third threaded hole 47 on the connecting component 4. The second key block 8 has a fourth threaded hole 82 on its lower side, and a first set screw 10 is provided in the fourth threaded hole 82. The front end of the first set screw 10 abuts against the first key block 7, thereby preventing the first key block 7 from loosening or falling off.

[0034] This invention achieves the connection between the spindle 2 and the connecting component 4 by setting a first keyway 21 at the tail end of the spindle 2, setting a second keyway 45 on the inner wall of the first inner hole 42, and setting a first key block 7 and a second key block 8 in the first keyway 21 and the second keyway 45 respectively. It eliminates the need to set a shoulder on the spindle 2, and can be adapted to occasions with specific requirements for the wall thickness of the spindle 2 while ensuring the structural strength of the spindle 2, thus improving the adaptability of the spindle connection structure.

[0035] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the protection scope claimed by this utility model.

Claims

1. A tail-end connection structure for a machine tool spindle, comprising a spindle housing, a spindle, a nut, and a connecting component, wherein the spindle is rotatably disposed within the spindle housing along an axial direction, the nut is sleeved on the outside of the spindle and connected to the spindle housing, and the connecting component is disposed at the tail end of the spindle, characterized in that: The connecting component has a through first inner hole and a second inner hole along the axial direction, and a shoulder is provided between the two. The first inner hole is sleeved on the outside of the tail end of the main shaft and the two are connected by a first key block. The nut has a plurality of first axial threaded holes spaced apart along its circumference. The connecting component has a plurality of second axial threaded holes spaced apart along the circumference. The plurality of first axial threaded holes and second axial threaded holes are connected one-to-one by a first bolt.

2. The tail end connection structure of the machine tool spindle according to claim 1, characterized in that: The outer wall of the spindle tail end is provided with a first keyway, and the inner wall of the first inner hole is provided with a second keyway. The first keyway and the second keyway are connected together to a first key block.

3. The tail end connection structure of the machine tool spindle according to claim 2, characterized in that: A third keyway is provided radially on the side wall of the second inner hole at the position behind the second keyway. A second key block is provided in the third keyway. A countersunk hole is provided on the upper side of the second key block. A second bolt is provided in the countersunk hole. The second bolt is connected to a third threaded hole on the connecting component. A fourth threaded hole is provided on the lower side of the second key block. A first set screw is provided in the fourth threaded hole. The front end of the first set screw abuts against the first key block.

4. The tail end connection structure of the machine tool spindle according to claim 1, characterized in that: The inner ring of the nut is threaded to the outer circle of the spindle, and the side of the nut is threaded to the end of the spindle box.

5. The tail end connection structure of the machine tool spindle according to claim 1, characterized in that: The nut has a fifth threaded hole on its top end face, and a second set screw is provided in the fifth threaded hole. The lower end of the second set screw abuts against the outer wall of the spindle.

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