KR102568884B1 - Apparatus for preventing a fall of a feeding member in a machine tool and machining center including the same - Google Patents

Abstract

An apparatus for preventing the fall of a conveying body of a machine tool may include a piston and a hydraulic mechanism. The piston restrains a lifting mechanism that elevates the conveying member of the machine tool, thereby preventing the conveying member from falling. The hydraulic mechanism may provide hydraulic pressure to the piston so that the lifting mechanism is constrained by the piston. Therefore, a fall of the conveying member is prevented, and a large-scale safety accident can be prevented in advance.

Description

Machine tool fall prevention device and machining center including the same

The present invention relates to a device for preventing a machine tool from falling, and to a machining center including the same, and more particularly, to a device for preventing a spindle head of a machining center from falling, and to a machining center including the device.

Generally, machine tools can be divided into turning centers and machining centers. Machining centers can process materials using rotating tools. On the other hand, a turning center can process a rotating material using a tool. The machining center may include a spindle head clamping a tool, a ball screw connected to the spindle head, and a motor rotating the ball screw.

According to related technologies, a reducer may be disposed between the motor and the ball screw in order to reduce the load on the motor. However, the spindle head may fall due to breakage of the ball screw or breakage of the coupling connecting the reducer and the ball screw.

The present invention provides a conveying body fall prevention device for a machine tool capable of preventing a conveying body such as a spindle head of a machine tool from falling.

In addition, the present invention also provides a machining center comprising the device described above.

An apparatus for preventing a machine tool from falling on a conveying body according to one aspect of the present invention may include a piston and a hydraulic mechanism. The piston restrains a lifting mechanism that elevates the conveying member of the machine tool, thereby preventing the conveying member from falling. The hydraulic mechanism may provide hydraulic pressure to the piston so that the lifting mechanism is constrained by the piston.

In example embodiments, the piston may be movably disposed under the lifting mechanism to selectively contact the lower end of the lifting mechanism.

In example embodiments, the device may further include a spring for elastically supporting the piston toward the lifting mechanism.

In example embodiments, the device may further include a housing for supporting the piston to move up and down, and a housing cap fixed to a lower end of the housing and to which the spring is fixed.

In exemplary embodiments, the hydraulic mechanism includes a first hydraulic line for providing hydraulic pressure for lowering the piston, a second hydraulic line for providing hydraulic pressure for raising the piston, and according to the fall of the conveying body. A solenoid valve providing the hydraulic pressure to the second hydraulic line may be included.

In example embodiments, the machine tool may include a machining center. The conveying member may include a spindle head. The transfer mechanism may include a ball screw.

A machining center according to another aspect of the present invention may include a spindle head, a ball screw, a motor, a piston and a hydraulic mechanism. The spindle head may clamp a tool. The ball screw may be connected to the spindle head. The motor may rotate the ball screw. The piston is arranged to be able to move up and down under the ball screw, and rotation of the ball screw can be prevented by making frictional contact with the ball screw when the spindle head falls. The hydraulic mechanism may provide hydraulic pressure to the piston so that the piston frictionally contacts the ball screw.

In exemplary embodiments, the hydraulic mechanism includes a first hydraulic line for providing the hydraulic pressure for lowering the piston, a second hydraulic line for providing the hydraulic pressure for raising the piston, and the fall of the spindle head. A solenoid valve for providing the hydraulic pressure to the second hydraulic line may be included.

In example embodiments, the machining center includes a spring that elastically supports the piston toward the ball screw, supports the piston so as to be able to move up and down, and connects the first hydraulic line and the second hydraulic line to the piston. It may further include a housing having a first port and a second port extending to, and a housing cap fixed to a lower end of the housing and to which the spring is fixed.

According to the present invention described above, when the fall of the conveying member is sensed, the hydraulic mechanism provides hydraulic pressure to the piston so that the piston can restrain the lifting mechanism. Therefore, a fall of the conveying member is prevented, and a large-scale safety accident can be prevented in advance.

1 is a perspective view showing a machine tool according to an embodiment of the present invention.
Figure 2 is a cross-sectional view showing the machine tool shown in Figure 1;
FIG. 3 is an enlarged perspective view of an apparatus for preventing the fall of a transporter of the machine tool shown in FIG. 1 .
Figure 4 is a cross-sectional view showing a state in which the fall prevention device shown in Figure 3 is not operated.
5 is a cross-sectional view showing a state in which the fall prevention device shown in FIG. 3 is operated.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

Since the present invention may have various changes and various forms, specific embodiments are illustrated in the drawings and described in detail in the text. However, it should be understood that this is not intended to limit the present invention to the specific disclosed form, and includes all modifications, equivalents, and substitutes included in the spirit and scope of the present invention. Like reference numerals have been used for like elements throughout the description of each figure.

Terms such as first and second may be used to describe various components, but the components should not be limited by the terms. These terms are only used for the purpose of distinguishing one component from another. For example, a first element may be termed a second element, and similarly, a second element may be termed a first element, without departing from the scope of the present invention.

Terms used in this application are only used to describe specific embodiments, and are not intended to limit the present invention. Singular expressions include plural expressions unless the context clearly dictates otherwise. In this application, terms such as "comprise" or "have" are intended to designate that there is a feature, number, step, operation, component, part, or combination thereof described in the specification, but one or more other features It should be understood that it does not preclude the possibility of the presence or addition of numbers, steps, operations, components, parts, or combinations thereof.

Unless defined otherwise, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which the present invention belongs. Terms such as those defined in commonly used dictionaries should be interpreted as having a meaning consistent with the meaning in the context of the related art, and unless explicitly defined in the present application, they should not be interpreted in an ideal or excessively formal meaning. don't

Figure 1 is a perspective view showing a machine tool according to an embodiment of the present invention, Figure 2 is a cross-sectional view showing the machine tool shown in Figure 1, Figure 3 is an enlarged conveying body fall prevention device of the machine tool shown in Figure 1 It is a perspective view shown by

Referring to FIGS. 1 to 3 , the machine tool according to the present embodiment may include a conveying member, an elevating mechanism, and a fall prevention device 160 .

In this embodiment, the machine tool may include a machining center, for example an NC boring machine. The machining center may include a spindle head 150 clamping a tool as a conveying body. The machining center may include a servo motor 110 and a ball screw 140 as lifting mechanisms.

The servo motor 110 may be disposed on the upper surface of the column (C) of the machining center. A reducer 120 may be connected to the servo motor 110 . The ball screw 140 may be connected to the reducer 120 via a coupling 130. The ball screw 140 may be rotatably supported on the column (C). Spindle head 150 may be fixed to ball screw 140 . Therefore, since the ball screw 140 is rotated by the servo motor 110, the spindle head 150 may be raised or lowered according to the rotation direction of the ball screw 140.

If the ball screw 140 is damaged or the coupling 130 is damaged, the ball screw 140 can rotate freely. Due to this, the heavy spindle head 150 may fall. In this case, the fall prevention device 160 restricts the rotation of the ball screw 140 to prevent the spindle head 150 from falling. The fall arrest device 160 may include a piston 162, a housing 164, a housing cap 166, a bracket 168, a spring 169 and a hydraulic mechanism 170.

The piston 162 may be disposed below the ball screw 140 . The piston 162 may restrain the ball screw 140 to prevent rotation of the ball screw 140 . Specifically, when the spindle head 150 falls, the piston 162 may rise in the direction of the ball screw 140 and frictionally contact the lower end of the ball screw 140 . Therefore, since the ball screw 140 is not rotated, the spindle head 150 may not descend any more.

The housing 164 may accommodate the piston 162 in a liftable manner. Thus, the piston 162 can rise or fall inside the housing 164 . The housing 164 may include a first port 164a and a second port 164b to which hydraulic pressure supplied from the hydraulic mechanism 170 is provided. The first port 164a may be formed on the upper side of the housing 164 . On the other hand, the second port 164b may be formed on the lower side of the housing 164 . The first port 164a and the second port 164b may pass through the housing 164 and lead to the piston 162 .

The hydraulic pressure supplied through the first port 164a may be applied to an upper portion of the piston 162 to lower the piston 162 toward the opposite side of the ball screw 140 . Accordingly, the piston 162 may not contact the lower end of the ball screw 140 . That is, since a gap is formed between the piston 162 and the lower end of the ball screw 140, rotation of the ball screw 140 may not be restricted.

On the other hand, when the spindle head 150 falls, the hydraulic pressure supplied through the second port 164b is applied to the lower part of the piston 162 to raise the piston 162 toward the ball screw 140. . Accordingly, the piston 162 comes into frictional contact with the lower end of the ball screw 140, and thus rotation of the ball screw 140 can be prevented. As a result, falling of the spindle head 150 can be prevented.

The housing cap 166 may be fixed to the lower end of the housing 164 . Housing cap 166 may selectively contact the lower surface of piston 162 . Specifically, the housing cap 166 may contact the lower surface of the lowered piston 162 . On the other hand, when the piston 162 is raised, the housing cap 166 may be spaced apart from the lower surface of the piston 162 .

The bracket 168 may fix the lower surface of the housing cap 166 . Bracket 168 may be fixed to column C.

The spring 169 may be fixed to the upper surface of the housing cap 166. Thus, the spring 169 may be disposed between the upper surface of the housing cap 166 and the lower surface of the piston 162 . The spring 169 may elastically support the piston 162 in the direction of the ball screw 140 . Therefore, when the piston 162 rises by the hydraulic pressure supplied through the second port 164b, the spring 169 also pushes the piston 162 upward, restricting the rotation of the ball screw 140. The restraining force of the piston 162 can be further strengthened. In particular, even when hydraulic pressure is not supplied through the second port 164b, the piston 162 can be raised by only the spring 169 and make frictional contact with the ball screw 140.

Meanwhile, when the ball screw 140 operates normally, it may be required that the piston 162 elastically supported upward by the spring 169 does not come into contact with the ball screw 140 . Therefore, the hydraulic pressure supplied through the first port 164a may be higher than the elastic force of the spring 169 .

The hydraulic mechanism 170 may selectively supply hydraulic pressure to the first port 164a and the second port 164b. The hydraulic mechanism 170 may include a first hydraulic line 172 , a second hydraulic line 174 and a solenoid valve 176 .

The first hydraulic line 172 may be connected to the first port 164a. The second hydraulic line 174 may be connected to the second port 164b. The solenoid valve 176 may control the hydraulic pressure to be selectively supplied to one of the first hydraulic line 172 and the second hydraulic line 174 . The hydraulic pressure controlled by the solenoid valve 176 may be the hydraulic pressure stored in the hydraulic device of the machining center.

Figure 4 is a cross-sectional view showing a state in which the fall prevention device shown in Figure 3 is not operated.

Referring to FIG. 4 , when the ball screw 140 operates normally, the solenoid valve 176 allows hydraulic pressure to be supplied only to the first hydraulic line 172 and the flow of hydraulic pressure to the second hydraulic line 174. can block Thus, hydraulic pressure can be applied to the upper side of the piston 162 through the first port 164a. The piston 162 may descend while compressing the spring 169 by hydraulic pressure, and may come into contact with the upper surface of the housing cap 168 .

On the other hand, the upper surface of the piston 162 may be spaced apart from the lower end of the ball screw 140 . Therefore, the piston 162 may not interfere with the rotational motion of the normally rotating ball screw 140 .

5 is a cross-sectional view showing a state in which the fall prevention device shown in FIG. 3 is operated.

Referring to FIG. 5, when the ball screw 140 is damaged or the coupling 130 is damaged, the solenoid valve 176 allows hydraulic pressure to be supplied only to the second hydraulic line 174, and the first hydraulic pressure The flow of hydraulic pressure may be blocked through the line 172 . Accordingly, hydraulic pressure may be applied to the lower side of the piston 162 through the second port 164b. The piston 162 may be raised by hydraulic pressure and may make frictional contact with the lower end of the ball screw 140 . The spring 169 may assist the lifting force of the piston 162 . Therefore, since the ball screw 140 no longer rotates, falling of the spindle head 150 can be prevented.

In particular, even when hydraulic pressure is not supplied to the second hydraulic line 174 due to power cut-off, the piston 162 is raised by the spring 169 and can frictionally contact the lower end of the ball screw 140. Therefore, although the spring 169 has a lower elastic force than the hydraulic pressure, the fall of the heavy spindle head 150 can be suppressed by the operation of the spring 169 as described above.

As described above, according to the present embodiments, when the fall of the conveying member is sensed, the hydraulic mechanism provides hydraulic pressure to the piston so that the piston can restrain the lifting mechanism. Therefore, a fall of the conveying member is prevented, and a large-scale safety accident can be prevented in advance.

As described above, although it has been described with reference to the preferred embodiments of the present invention, those skilled in the art will variously modify the present invention within the scope not departing from the spirit and scope of the present invention described in the claims below. And it will be understood that it can be changed.

110; servo motor 120; reducer
130; Coupling 140; ball screw
150; Spindle head 160; fall arrest device
162; Piston 164; housing
164a; first port 164b; 2nd port
166; housing cap 168; bracket
169; spring 170; hydraulic mechanism
172; first hydraulic line 174 ; 2nd hydraulic line
176; solenoid valve

Claims (9)

a piston that restrains an elevating mechanism that lifts the conveying member of the machine tool and prevents the conveying member from falling;
a spring that elastically supports the piston toward the elevating mechanism; and
A hydraulic mechanism for providing hydraulic pressure to the piston so that the lifting mechanism is constrained by the piston;
The piston is movably disposed under the lifting mechanism and selectively contacts the lower end of the lifting mechanism;
The hydraulic mechanism
a first hydraulic line providing hydraulic pressure to lower the piston;
a second hydraulic line providing hydraulic pressure to raise the piston; and
A solenoid valve providing the hydraulic pressure to the second hydraulic line according to the fall of the conveying body,
The hydraulic pressure supplied through the first hydraulic line is higher than the elastic force of the spring. delete delete According to claim 1,
a housing supporting the piston so as to be able to move up and down; and
A machine tool conveyor fall prevention device fixed to a lower end of the housing and further comprising a housing cap to which the spring is fixed. delete The device of claim 1 , wherein the machine tool includes a machining center, the conveying member includes a spindle head, and the elevating mechanism includes a ball screw. spindle head clamping the tool;
a ball screw to which the spindle head is connected;
a motor rotating the ball screw;
a piston disposed below the ball screw so as to be able to move up and down, and preventing rotation of the ball screw by making frictional contact with the ball screw when the spindle head falls;
a spring for elastically supporting the piston toward the ball screw; and
A hydraulic mechanism for providing hydraulic pressure to the piston so that the piston frictionally contacts the ball screw;
The piston is movably disposed under the ball screw and selectively contacts the lower end of the ball screw,
The hydraulic mechanism
a first hydraulic line providing hydraulic pressure to lower the piston;
a second hydraulic line providing hydraulic pressure to raise the piston; and
A solenoid valve providing the hydraulic pressure to the second hydraulic line when the spindle head falls,
The hydraulic pressure supplied through the first hydraulic line is higher than the elastic force of the spring. delete According to claim 7,
a housing supporting the piston so as to be able to move up and down, and having a first port and a second port connected to the first hydraulic line and the second hydraulic line and extending to the piston; and
The machining center further includes a housing cap fixed to a lower end of the housing and to which the spring is fixed.

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