A rotating shaft limiting mechanism

Abstract

A rotary shaft limiting mechanism belongs to the field of machine tools. More specifically, it is a rotary shaft limiting mechanism applied to machine tools based on the differential gear principle. The present invention provides a simple, practical, safe and reliable rotary shaft limiting mechanism. The present invention includes a housing, and is characterized in that: a limiting wheel is arranged inside the housing, an arc-shaped groove group is arranged at the edge of the limiting wheel, an induction block is arranged on the surface of the limiting wheel, and a proximity switch corresponding to the induction block is arranged on the housing.

Description

Technical Field

[0001] The present invention belongs to the field of machine tools, and more specifically, relates to a rotary shaft limiting mechanism based on the differential tooth principle and applied to machine tools. Background Art

[0002] The five-axis head is the core functional component of the five-axis linkage machining center. There are many cables and pipelines inside the five-axis head. When the C-axis of the five-axis head rotates, the internal cables and pipelines move in a complex manner. When the C-axis rotation angle is large, the internal cables and pipelines will be damaged, which may cause processing accidents in serious cases. Therefore, the C-axis rotation stroke must be limited. Summary of the Invention

[0003] The present invention aims to solve the above problems and provides a simple, practical, safe and reliable rotating shaft limiting mechanism.

[0004] In order to achieve the above-mentioned purpose of the present invention, the present invention adopts the following technical solution, which includes a shell, characterized in that: a limiting wheel is arranged in the shell, an arc groove group is arranged at the edge of the limiting wheel, a sensing block is arranged on the surface of the limiting wheel, and a proximity switch is arranged on the shell corresponding to the sensing block.

[0005] As a preferred solution of the present invention, the present invention further comprises a limiting shaft connected to the rotating shaft of the machine tool, and the limiting shaft cooperates with the arc groove of the arc groove group.

[0006] Furthermore, a matching bearing is provided on the limiting shaft, and the outer circle of the matching bearing matches the arc groove.

[0007] As another preferred solution of the present invention, a friction resistance mechanism of a limiting wheel is provided on the housing.

[0008] Furthermore, the friction resistance mechanism includes a clamping end cover, the lower surface of the clamping end cover is in contact with the shell, a pressure cover is arranged above the pressure cover end surface, a central axis is arranged at the center of the limiting wheel, one end of the central axis passes through the clamping end cover and is connected to the pressure cover by a thread, and the pressure cover presses the clamping end cover onto the shell.

[0009] Furthermore, a locking nut with a pressure cover is provided at the end of the central shaft.

[0010] Furthermore, support bearings that cooperate with both ends of the central axis are provided in the shell and the upper cover.

[0011] As a third preferred embodiment of the present invention, the arc grooves of the arc groove group are circumferentially distributed on the outer circle of the limiting wheel, there are 5 arc grooves, and the angle between the center lines of each two arc grooves is 60°; the sensing block is arranged in an interval on the limiting wheel where there are no arc grooves; the number of proximity switches on the shell is set to three, and the three proximity switches and the sensing block are all located on the concentric circles of the limiting wheel, and the angle between the three proximity switches is 90°.

[0012] Advantages of the present invention: 1. The present invention uses a mechanical structure to limit the rotation shaft, which has a simple structure, small volume, convenient installation and high limiting accuracy.

[0013] 2. By setting a friction resistance mechanism, the present invention can ensure that the limiting wheel will not continue to move due to inertia after being driven by the shaft to be limited, thus avoiding mis-triggering of the proximity switch.

[0014] 3. By setting three proximity switches, the three proximity switches cooperate with the induction block to send signals, which is convenient for calculating the position of the induction block and avoiding misoperation problems. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 is a schematic structural view of the present invention.

[0016] Figure 2 is Figure 1 the top view of

[0017] Figure 3 is Figure 1 the B-B cross-sectional view of

[0018] Figure 4 is Figure 2 the A-A cross-sectional view of

[0019] Figure 5 is a schematic structural view of the limiting wheel.

[0020] Figure 6 is the C-C cross-sectional view of the limiting wheel.

[0021] In the drawings, 1 is the housing, 2 is the upper cover, 3 is the compression end cover, 4 is the gland, 5 is the limiting shaft, 6 is the proximity switch, 7 is the induction block, 8 is the limiting wheel, 9 is the arc groove, and 10 is the base. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0022] The present invention includes a housing 1, and is characterized in that: a limiting wheel 8 is arranged inside the housing 1, a set of arc grooves 9 are arranged at the edge of the limiting wheel 8, an induction block 7 is arranged on the surface of the limiting wheel 8, and a proximity switch 6 is arranged on the housing 1 corresponding to the induction block 7.

[0023] As a preferred solution of the present invention, the present invention further includes a limiting shaft 5 connected to the rotating shaft of the machine tool, and the limiting shaft 5 is matched with the arc grooves 9 of the set of arc grooves 9.

[0024] Furthermore, a mating bearing is arranged on the limiting shaft 5, and the outer circle of the mating bearing is matched with the arc groove 9.

[0025] As another preferred embodiment of the present invention, a frictional resistance mechanism for the limiting wheel 8 is provided on the housing 1.

[0026] Further, the frictional resistance mechanism includes a pressing end cover 3, the lower surface of the pressing end cover 3 contacts the housing 1, a gland 4 is provided above the end face of the gland 4, a central shaft is provided at the center of the limiting wheel 8, and one end of the central shaft passes through the pressing end cover 3 and the gland 4 and is connected by a thread, and the gland 4 presses the pressing end cover 3 on the housing 1.

[0027] Furthermore, a locking nut for the gland 4 is provided at the end of the central shaft.

[0028] Furthermore, support bearings for cooperating with both ends of the central shaft are provided in the housing 1 and the upper cover 2.

[0029] As the third preferred embodiment of the present invention, the arc grooves 9 of the arc groove group 9 are circumferentially distributed on the outer circle of the limiting wheel 8, there are 5 arc grooves 9, and the included angle between the center lines of every two arc grooves 9 is 60°; the induction block 7 is arranged in the interval of the limiting wheel 8 where there is no arc groove 9; three proximity switches 6 on the housing 1 are arranged, and the three proximity switches 6 and the induction block 7 are all located on the concentric circle of the limiting wheel 8, and the included angle between the three proximity switches 6 is 90°.

[0030] The present invention is a rotating shaft limiting mechanism based on the differential tooth principle. The housing 1 is composed of an upper cover 2 and a base 10. The upper cover 2 is installed on the base 10 through multiple screws. The two ends of the central shaft of the limiting wheel 8 are respectively installed on the base 10 and the upper cover 2 through bearings. The induction block 7 is installed on the limiting wheel 8 through screws. Multiple proximity switches 6 are vertically installed on the upper cover 2, and the installation positions are concentric circles with the center on the axis of the limiting wheel 8. The gland 4 is installed on the upper end of the central shaft of the limiting wheel 8 through a thread, and at the same time presses the pressing end cover 3. The upper part of the gland 4 is locked through a locking nut. The limiting shaft 5 is fixed on the rotating shaft of the machine tool and is installed on the limiting shaft 5 through a shaft-mounted spring retaining ring in cooperation with a bearing.

[0031] Both ends of the limiting wheel 8 are respectively installed on the upper cover 2 and the base 10 through support bearings. The upper cover 2 and the base 10 are installed on the workbench surface through multiple screws, and the limiting wheel 8 can rotate around its own axis.

[0032] The limiting shaft 5 is installed on the rotating shaft of the machine tool. The bearing is installed on the limiting shaft 5 through a shaft-mounted spring retaining ring. The end cover is installed on the upper cover 2 through screws. The gland 4 is installed on the central shaft of the limiting wheel 8 through a thread, and at the same time presses the pressing end cover 3. When the bearing in cooperation with the limiting shaft 5 meshes with the arc groove 9 of the limiting wheel 8, it drives the limiting wheel 8 to rotate. When the bearing in cooperation leaves the limiting wheel 8, the limiting wheel 8 stops rotating due to the frictional force between the end cover and the gland 4, that is, the limiting wheel 8 stops at the required specified position.

[0033] Multiple proximity switches 6 are vertically installed on the upper cover 2. The induction block 7 is installed on the limit wheel 8 by screws. The induction block 7 rotates with the limit wheel 8. When the induction block 7 rotates to directly below the proximity switch 6, an induction is generated therewith, and the rotating shaft stops rotating.

[0034] It can be understood that the above specific description of the present invention is only for explaining the present invention and is not limited to the technical solutions described in the embodiments of the present invention. Those of ordinary skill in the art should understand that the present invention can still be modified or equivalently replaced to achieve the same technical effect; as long as it meets the usage requirements, it is within the protection scope of the present invention.

Claims

1. A rotating shaft limiting mechanism, comprising a housing (1), characterized in that: A limiting wheel (8) is provided in the housing (1), an arc groove (9) group is provided at the edge of the limiting wheel (8), a sensing block (7) is provided on the surface of the limiting wheel (8), and a proximity switch (6) is provided on the housing (1) corresponding to the sensing block (7); it also includes a limiting shaft (5) connected to the rotating shaft of the machine tool, the limiting shaft (5) cooperates with the arc groove (9) of the arc groove (9) group; a friction resistance mechanism of the limiting wheel (8) is provided on the housing (1); the friction resistance mechanism includes a clamping end cover (3), the lower surface of the clamping end cover (3) contacts the upper cover (2), a pressure cover (4) is provided above the end surface of the clamping end cover (3), a central axis is provided at the center of the limiting wheel (8), one end of the central axis passes through the clamping end cover (3) and is connected to the pressure cover (4) by a thread, and the pressure cover (4) presses the clamping end cover (3) on the housing (1).

2. The rotating shaft limiting mechanism according to claim 1, characterized in that: A matching bearing is provided on the limiting shaft (5), and the outer circle of the matching bearing matches the arc groove (9).

3. The rotating shaft limiting mechanism according to claim 1, characterized in that: The end of the central shaft is provided with a locking nut of a gland (4).

4. The rotating shaft limiting mechanism according to claim 1, characterized in that: Support bearings that cooperate with both ends of the central axis are provided in the housing (1) and the upper cover (2).

5. The rotating shaft limiting mechanism according to claim 1, characterized in that: The arc grooves (9) of the arc groove (9) group are circumferentially distributed on the outer circle of the limiting wheel (8), there are five arc grooves (9), and the angle between the center lines of each two arc grooves (9) is 60°; the sensing block (7) is arranged in an area on the limiting wheel (8) where there is no arc groove (9); the number of proximity switches (6) on the housing (1) is three, the three proximity switches (6) and the sensing block (7) are all located on the concentric circle of the limiting wheel (8), and the angle between the three proximity switches (6) is 90°.

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