WO2018008120A1

WO2018008120A1 - Output apparatus

Info

Publication number: WO2018008120A1
Application number: PCT/JP2016/070088
Authority: WO
Inventors: 後藤繁夫; 澤端良彦; 黒木昭伍
Original assignee: 富士機械製造株式会社
Priority date: 2016-07-07
Filing date: 2016-07-07
Publication date: 2018-01-11
Also published as: JP7074669B2; JPWO2018008120A1; CN109475948A

Abstract

This output apparatus (1) outputs motion in the axial direction with respect to an integrally assembled operation device (2), and is provided with: an actuator (18) that generates the motion in the axial direction; a connection rod (17) that is fixed coaxially to an output rod (181) of the actuator (18); and a detection sensor (25) that detects the displacement of the output rod (181) of the actuator, wherein the connection rod (17) is provided with a first rod (31) that is fixed to the output rod side and a second rod (32) that is fixed to the operation device side, the first rod (31) and the second rod (32) are connected with a non-transmission part provided in the axial direction so as to extend stroke during output.

Description

Output device

The present invention relates to an output device that expands a stroke during output.

As an example of executing a predetermined operation by receiving a linear motion in the axial direction, a spindle chuck of a machine tool can be given as an example. The spindle chuck converts axial linear motion into radial motion, and clamps and unclamps the workpiece. An output device that outputs axial linear motion, and radial output by the axial output. A chuck device that performs opening and closing movements is integrally assembled. Patent Document 1 listed below discloses a tool chuck device for a machine tool.

Also in the tool chuck device, a chuck device for gripping a workpiece and an output device for generating a gripping force are integrally assembled, and a collet chuck mechanism is connected via a draw bar of the output device. The draw bar is configured such that a spring force acts in the pulling direction that is the clamping direction, while an output from the cylinder acts in the pushing direction that is the unclamping direction. In the output device, a disc-shaped dog is fixed to the piston rod of the cylinder, and a sensor for detecting the position of the dog is provided. Therefore, the clamping state and the unclamping state in the chuck device can be confirmed by detecting the operation state of the cylinder with a sensor.

JP 2003-225812 A

The output device is configured integrally with a chuck device, which is an operating device, as in the case of the spindle chuck described above, and outputs an axial linear motion for causing the operating device to perform a predetermined operation. Therefore, when the movement in the operating device is small and the operating range is narrow, the operating range of the output device is accordingly reduced. That is, the axial displacement of the output rod in the actuator is small, and depending on the device, the stroke may be as small as 1 mm or less. In such a case, since the displacement of the dog is also small, setting adjustment of a detection sensor (proximity sensor or the like) that detects the displacement becomes very difficult. On the other hand, in order to facilitate the setting adjustment by the detection sensor, it is necessary to select an operating device that increases the stroke at the time of output of the output device.

Therefore, an object of the present invention is to provide an output device that expands a stroke at the time of output in order to solve such a problem.

An output device according to an aspect of the present invention outputs axial motion to an integrally assembled actuator, and includes an actuator that generates axial motion and an output rod of the actuator. A connecting rod fixed on the same axis; and a detection sensor for detecting a displacement of the output rod of the actuator; the connecting rod being fixed to the output rod side; A fixed second rod, and the first rod and the second rod are connected with a non-transmission portion in the axial direction.

According to the present invention, the connecting rod that connects the actuator and the actuator side is divided into the first rod and the second rod, and the first and second rods do not transmit the linear motion of the actuator in the axial direction. Since the transmission portion is connected and connected, even when the operating range of the operating device is narrow, the stroke at the time of output of the actuator is expanded, and the setting adjustment of the detection sensor for detecting the operating state is facilitated.

It is sectional drawing which showed one Embodiment of the output device. It is sectional drawing which expanded and showed the connection part of the draw bar which comprises an output device. It is sectional drawing which showed the change of the connection part of a draw bar.

Next, an embodiment of an output device according to the present invention will be described below with reference to the drawings. In the present embodiment, an output device that constitutes a part of a spindle chuck of a machine tool will be described as an example. FIG. 1 is a sectional view showing the output device. A chuck device 2 as an operating device is integrally assembled with the output device 1 in a range indicated by a one-dot chain line, and a spindle chuck 5 is configured. The spindle chuck 5 grips the workpiece by the chuck device 2 by the output in the axial direction of the output device 1, and further transmits the rotational motion via the output device 1 to give the workpiece rotation. In a machine tool, a predetermined process is performed by applying a tool to the rotating workpiece.

The output device 1 is configured such that a spindle 12 is rotatable in a cylindrical turntable 11, and a chuck device 2 is fixed to the tip of the spindle 12. A pulley 13 is fixed to the spindle 12, and a belt 14 is stretched between a pulley fixed to a rotating shaft of a spindle motor (not shown). Further, the spindle 12 is provided with an encoder (not shown) for detecting the rotational speed, and the timing belt 16 is also passed between the pulley 15 fixed to the spindle 12 and the pulley on the encoder side. Has been. Therefore, rotation is transmitted from the spindle motor whose rotation is controlled to the chuck device 2 via the spindle 12, and rotation at the time of machining is given to the clamped workpiece.

Also, a cylindrical draw bar 17 is inserted into the spindle 12, and an actuator for driving the chuck device 2 is connected to the draw bar 17. In the present embodiment, a hydraulic cylinder 18 is used as an actuator, a cylindrical piston rod 182 is formed integrally with a piston 181, and a cylindrical draw bar 17 is coaxially connected to the piston rod 182. . Accordingly, the hydraulic cylinder 18 is activated by the supply and discharge of the hydraulic oil performed through the rotary joint 19, and the movement in the axial direction (XR direction and XL direction) is output to the chuck device 2 via the draw bar 17.

The hydraulic cylinder 18 is a double rod cylinder in which a piston rod 182 protrudes in both directions from the piston 181, and extends to the inducer 21 on the rear side (XL side) of the output device 1. An air pipe 22 is inserted into the piston rod 182, and compressed air is supplied into the air pipe 22 from a port of the inducer 21. The air pipe 22 is connected to a flow path in the chuck device 2 and is used as chuck detection air performed by the chuck device 2.

Furthermore, a disc-shaped dog 23 is fixed to the piston rod 182, and a proximity sensor 25 is provided for the dog 23. The proximity sensor 25 detects the operating state of the hydraulic cylinder 18 from the displacement of the dog 23. In the spindle chuck 5, a linear motion is output in the axial direction from the piston rod 182 by the operation of the hydraulic cylinder 18, and the linear motion is transmitted to the chuck device 2 via the draw bar 17. In the chuck device 2, the linear linear motion is converted into the radial opening / closing motion, and the workpiece is clamped and unclamped.

By the way, in the conventional output device, the piston rod, the draw bar, and the chuck mechanism of the chuck device 2 are directly connected. Therefore, if a conventional output device is used for the spindle chuck 5, the stroke of the linear motion output from the output device is determined according to the operating range of the chuck device 2. Regarding the chuck device 2 of the present embodiment, the stroke of the output device is 1 mm. Therefore, if the axial displacement of the dog 23 is about 1 mm, setting adjustment for accurate detection by the proximity sensor 25 becomes very difficult as described in the above problem.

Therefore, the output device 1 of the present embodiment is configured such that the output operation of the hydraulic cylinder 18 with a certain amount of stroke can be performed without being affected by the operation range of the chuck device 2 and the like assembled together. Specifically, the configuration of the draw bar 17 that transmits the linear motion in the axial direction between the piston rod 182 and the operation device such as the chuck device 2 is changed. FIG. 2 is an enlarged cross-sectional view of a part of the draw bar 17 (connecting portion 30).

In the draw bar 17, the first rod 31 fixed to the piston rod 18 and the second rod 32 fixed to the chuck mechanism side of the chuck device 2 are separated, and the first rod 31 and the second rod 32 are connected. A connecting portion 30 is configured. In the connecting portion 30, the first connecting member 33 is integrated with the first rod 31 by screwing of the screw portion, and the second connecting member 34 is integrated with the second rod 32 by screwing of the screw portion. . In the present embodiment, the first rod 31 is formed with a longer dimension than the second rod 32, but there is no specific condition for the difference in length or the size of the dimension.

The first rod 31, the second rod 32, the first connecting member 33, and the second rod 32 constituting the draw bar 17 are all cylindrical, and the first connecting member 33 and the second rod 32 move in the axial direction with respect to each other. The protrusion part which restrains is formed. The first protrusion 331 of the first connecting member 33 protrudes in an annular shape toward the inside, and a first annular groove 35 is formed radially inward by the first rod 31 and the first connecting member 33. On the other hand, the second protruding portion 341 of the second connecting member 34 protrudes in an annular shape toward the outside, and a second annular groove 36 is formed radially outward by the second rod 32 and the second connecting member 34.

The first protrusion 331 enters the second annular groove 36, and the second protrusion 341 enters the first annular groove 35, so that the

protrusions

331 and 341 are engaged with each other in the axial direction. Yes. However, the axial dimension of the first projecting portion 331 is shorter than that of the second annular groove 36, and the second projecting portion 341 is shorter than the first annular groove 35. Therefore, a gap in the axial direction (XR direction and XL direction) is formed between the first rod 31 and the second rod 32 in the connecting portion 30, and the gap is one of the first rod 31 and the second rod 32. Is a “non-transmitting part” that allows relative movement with respect to the other. That is, the output of the hydraulic cylinder 18 is not transmitted to the chuck device 2 by the gap in the first annular groove 35 and the second annular groove 36.

Next, a cylindrical support member 37 is fitted and screwed to the tip portion of the spindle 12 on the chuck device 2 side. The support member 37 inserts the distal end portion of the draw bar 17, that is, the second rod 32, and supports it slidably. In this embodiment, the support member 37 also serves as a spring receiver that supports the spring 38 that biases the second rod 32 toward the first rod 31. That is, the second rod 32 has a spacer 39 abutted against the outer peripheral projection 321, and a spring 38 is inserted between the spacer 39 and the support member 37.

The normal state of the output device 1 shown in FIG. 2 is the unclamped state of the chuck device 2. As shown in FIG. 1, the hydraulic cylinder 18 has the piston 181 displaced in the XR direction, and the piston rod 182 and the draw bar 17 are moved. Extrusion to the chuck device 2 is performed via At this time, in the connecting portion 30, the positions of the first rod 31 and the first connecting member 33 are determined in the XR direction corresponding to the piston 181. On the other hand, the position of the second rod 32 and the second connecting member 34 is determined such that the second connecting member 34 receives an urging force in the XL direction from the spring 38 and the second connecting member 34 abuts against the end surface of the first rod 31. .

Therefore, when the chuck device 2 is in the clamped state, the output device 1 operates the hydraulic cylinder 18 so as to displace the piston 181 in the XL direction, and the draw bar 17 is pulled in the XL direction via the piston rod 182. . Here, FIG. 3 is a cross-sectional view of the connecting portion 30 showing the case where the draw bar 17 is pulled in the XL direction in a stepwise manner.

FIG. 3A shows the normal state as in FIG. That is, the chuck device 2 is in an unclamped state. Accordingly, the hydraulic cylinder 18 is operated, and the piston 181 moves in the XL direction by the moving distance X1 as shown in FIG. At this time, the first rod 31 and the first connecting member 33 directly connected to the piston rod 182 are integrally pulled in the XL direction. The second rod 32 and the second connecting member 34 move in the XL direction while maintaining the positional relationship between the first rod 31 and the first connecting member 33 by the biasing force of the spring 38. The moving distance X1 at this time is about 1 mm.

When the entire drawbar 17 has moved by the movement distance X1, the chuck device 2 changes from the unclamped state to the clamped state. That is, the stroke for the chuck device 2 to clamp the workpiece is 1 mm. However, the clamp on the workpiece at this stage is only the spring force of the spring 38 of the output device 1 acting. Therefore, the piston 181 further moves in the XL direction, and the first rod 31 and the first connecting member 33 move in the XL direction by the moving distance X2, as shown in FIG. This movement distance X2 is a movement distance corresponding to the non-transmission portion provided in the first and second

annular grooves

35, 36, and specifically, about 4 mm.

When the first protrusion 331 moves in the XL direction in the first annular groove 35 and is abutted against the radial protrusion 341 of the second connecting member 34, the second rod 32 and the second connecting member 34 are moved. Thus, the output of the hydraulic cylinder 18 is transmitted, and a clamping force for gripping the workpiece is generated in the chuck device 2. Therefore, in order for the output device 1 to clamp the workpiece on the chuck device 2 in the unclamped state, the hydraulic cylinder 18 moves the piston 181 by the moving distance (X1 + X2).

On the other hand, in order to change the chuck device 2 from the clamped state to the unclamped state, the hydraulic cylinder 18 is operated, and as shown in FIGS. 3C to 3B, the piston 181 moves in the XR direction by the moving distance X2. Moving. At this time, the first rod 31 and the first connecting member 33 directly connected to the piston rod 182 move together in the XR direction. On the other hand, the second rod 32 and the second connecting member 34 are not moved because they are biased in the XL direction by the spring 38. However, in the state shown in FIG. 3B, the first rod 31 is abutted against the second connecting member 34.

Therefore, the piston 181 further moves in the XR direction by the moving distance X1, and at this time, the output of the hydraulic cylinder 18 is transmitted to the second rod 32 and the second connecting member 34. Therefore, the second rod 32 and the second connecting member 34 move in the XR direction against the urging force of the spring 38, and the workpiece is unclamped in the chuck device 2. Therefore, even when the output device 1 switches the chuck device 2 in the clamped state to the unclamped state, the hydraulic cylinder 18 moves the piston 181 by the moving distance (X1 + X2).

Therefore, according to this embodiment, since the non-transmission portion is formed in the connecting portion 30 of the draw bar 17, the hydraulic cylinder 18 can be operated with a larger stroke. That is, according to the operation range of the clamping and unclamping of the chuck device 2, the output of the hydraulic cylinder 18 is substantially a stroke of about 1 mm, but in this embodiment, the stroke is expanded to about 5 mm. Therefore, the moving range of the dog 23 fixed to the piston rod 182 is 5 mm, and the setting adjustment of the proximity sensor 25 that detects the movement of the dog 23 is facilitated.

Although the output device 1 is not shown in detail, a conventional integrated draw bar that does not have the connecting portion 30 can be attached instead of the draw bar 17. Therefore, the output device 1 is combined with an operating device such as the chuck device 2 to form one device, but a draw bar can be selected according to the operating range of the operating device to be assembled. At that time, since the main body of the output device 1 is left as it is, it is only necessary to replace the drawbar, so that the above effect can be achieved without cost.

In the draw bar 17, the connecting member 33 is formed on the first rod 31, and the connecting member 34 is formed on the second rod 32 by a simple assembling structure using screw portions. Further, in the present embodiment, the

annular grooves

35 and 36 are formed by the connecting

members

33 and 34, and the projecting

portions

331 and 341 which are provided with non-transmission portions and mesh with each other are inserted, and the above configuration is achieved by a simple configuration. The effect can be achieved. Further, since the urging force is always applied to the second rod 32 side not directly connected to the hydraulic cylinder 18 by the spring 38, the state on the second rod 32 side when the output device 1 is stopped or activated. Is stable.

As mentioned above, although one Embodiment of this invention was described, this invention is not limited to these, A various change is possible in the range which does not deviate from the meaning.
For example, the actuator of the output device 1 is not limited to the hydraulic cylinder 18 but may be an air cylinder or the like.
In the above embodiment, a non-contact proximity sensor is shown as the detection sensor, but a contact sensor may be used.

DESCRIPTION OF SYMBOLS 1 ... Output device 2 ... Chuck apparatus 5 ... Spindle chuck 17 ... Drawbar 18 ... Hydraulic cylinder 23 ... Dog 25 ... Proximity sensor 30 ... Connection part 31 ... 1st rod 32 ... 2nd rod 33 ... 1st connection member 34 ... 2nd Connecting member 35 ... first annular groove 36 ... second annular groove 181 ... piston 182 ... piston rod 331 ... first protrusion 341 ... second protrusion

Claims

In an output device that outputs axial motion to an integrally assembled actuator,
An actuator that generates axial motion;
A connecting rod fixed coaxially to the output rod of the actuator;
A detection sensor for detecting the displacement of the output rod of the actuator;
The connecting rod includes a first rod fixed to the output rod side and a second rod fixed to the actuating device side, and the first rod and the second rod have a non-transmitting portion in the axial direction. An output device characterized by being connected.
The connecting rod has a pair of radial directions in which a connecting member having a radial protruding portion protruding inward or outward in the radial direction with respect to the first rod and the second rod is fixed and arranged in the axial direction. The output device according to claim 1, wherein the non-transmission portion is generated between the protrusions.
The output device according to claim 1 or 2, wherein the first rod, the second rod, and the connecting member are cylindrical members and are connected to each other by a screw portion.
The output device according to any one of claims 1 to 3, wherein the second rod is a member in which an urging force by a spring acts toward the first rod side.