JP6565888B2 - Lifting unit - Google Patents

Description

  The present invention relates to a lifting unit suitable for use by being incorporated in a mold drilling device or the like.

  In the mold making line, lifting and gas holes are formed in the molded mold using a drill. In order to automatically perform this drilling, a lifting unit that lifts and lowers a drilling drill has been conventionally used.

  One example thereof is described in Patent Document 1. The lifting unit of Patent Document 1 has a structure in which a drill rotating air motor and a drill are lifted and lowered by an lifting air cylinder. However, since casting sand and dust are scattered during the drilling process and adhere to the exposed piston rod of the air cylinder and the like, there is a problem that they are likely to break down due to their engagement.

  Moreover, the raising / lowering unit shown in FIG. 3 is also used conventionally. In this case, a linear guide 104 and a ball screw 103 are provided vertically in a casing 109, and an elevating member 110 having a nut 112 that meshes with the ball screw 103 when the ball screw 103 is rotated by an elevating servo motor 102 disposed in the upper part. And the rotary ball spline 107 supported by the lifting member 110 is lifted and lowered.

  The rotary ball spline 107 is rotatably supported by a pair of upper and lower ball spline nuts 108 provided on the lower surface of the casing 109, and a timing rotating belt 106 is interposed by a servo motor 105 for rotating the drill provided on the lower outer side of the casing 109. Is rotated. With this structure, the drilling drill 111 attached to the lower end of the rotary ball spline 107 can be raised and lowered while rotating.

  The conventional elevating unit shown in FIG. 3 is less prone to failure than the elevating unit of Patent Document 1 because the linear guide 104 and the ball screw 103 are housed inside the casing 109. However, the rotary ball spline 107 that moves up and down is bare and has a concave and convex cross section, making it difficult to prevent dust, so adhering foundry sand and dust are brought into the casing 109 when it rises, and the casing 109 The internal ball spline nut 108 may be damaged.

Japanese Patent Publication No.59-4223

  Accordingly, an object of the present invention is to provide an elevating unit that solves the above-mentioned conventional problems, can raise and lower a drilling hole vertically, and is less likely to fail due to foundry sand and dust than conventional ones. .

  An elevating unit of the present invention made to solve the above-described problems includes an elevating transmission mechanism for elevating and lowering an elevating body driven by a motor inside a casing whose interior is maintained at a positive pressure, and an elevating guide for the elevating body. And the lifting body is coupled to a drill drill outside the casing through a guide pin, and the casing penetrating portion of the guide pin is protected from dust by a dust seal.

  In addition, it is preferable that the said motor is a reduction motor or a servomotor arrange | positioned on the outer side of a casing. Moreover, it is preferable that the said raising / lowering transmission mechanism is a rack and a pinion, or a ball screw.

  An elevating unit of the present invention encloses an elevating transmission mechanism that is driven by a motor to elevate an elevating body and an elevating guide of the elevating body and encloses the elevating body in a casing whose interior is maintained at a positive pressure. It is a structure in which a casing drilling portion of the guide pin is dust-proofed by a dust seal by being coupled to a drill bit outside the casing via a guide pin. For this reason, the dust-proof effect by a dust seal can be heightened by making the cross section of the guide pin which penetrates a casing into the shape which is easy to seal. In addition, the lifting unit of the present invention is not prone to failure because the lifting transmission mechanism consisting of a rack and pinion and a ball screw, which is weak against the intrusion of foundry sand and dust, is enclosed in a casing whose interior is maintained at a positive pressure. It is.

  Furthermore, since the lifting unit of the present invention has a structure in which the lifting body is guided by the lifting guide inside the casing, the rigidity can be increased, and the drilling drill can be lifted vertically with high accuracy.

It is a 3rd page figure which shows 1st Embodiment which used the rack and pinion for the raising / lowering transmission mechanism. It is a 3rd view which shows 2nd Embodiment using the ball screw for the raising / lowering transmission mechanism. It is a 3rd view which shows the conventional raising / lowering unit.

Hereinafter, preferred embodiments of the present invention will be described.
FIG. 1 shows an elevating unit 1 using a rack and pinion as an elevating transmission mechanism.

  In FIG. 1, 9 is a box-shaped casing, which is attached to appropriate moving means 14 indicated by a two-dot chain line, and is movable in both X and Y axial directions within a horizontal plane. In the casing 9, a pair of left and right linear guides 4 and 4 as vertical guides are provided vertically. Further, an elevating transmission mechanism is provided inside the casing 9.

  The elevating transmission mechanism of the first embodiment includes a rack 3a, a pinion 3b, and an elevating body 3c. The rack 3a is fixed integrally with the elevating body 3c. The elevating body 3c is guided by the linear guides 4 and 4 so as to be raised and lowered.

  A lifting / lowering servomotor 2 is fixed to the outer surface of the casing 9, and its output shaft passes through the wall surface of the casing 9 and a pinion 3 b is attached. For this reason, when the pinion 3b is rotated by the servo motor 2, the rack 3a is lifted and lowered inside the casing 9 together with the lifting body 3c.

  A vertically extending guide pin 10 is fixed to the lower end of the elevating body 3c. The guide pin 10 penetrates the bottom surface of the casing 9 and extends downward. The casing penetration portion of the guide pin 10 is dust-proofed by a dust seal 12. Also, compressed air is supplied into the casing 9 from the connection port 13, and the inside of the casing 9 is always maintained at a positive pressure. For this reason, even if the guide pin 10 moves up and down, foundry sand and dust do not enter the inside of the casing 9.

  As shown in the drawing, a servo motor 5 for rotating a drill is vertically attached to a lower portion of the guide pin 10 via a horizontal arm 15, and a drill drill 11 is coupled to the output shaft by a coupling 6. Yes.

  The elevating unit configured as described above is moved in the horizontal direction to a predetermined position by the moving means 14. Then, while rotating the drilling drill 11 with the servo motor 5 for rotating the drill, the drilling drill 11 is moved up and down via the guide pins 10 attached to the lifting body 3c by the servomotor 2 to perform drilling of the mold, etc. Do. Since the elevating body 3c is vertically supported by the linear guides 4 and 4 inside the casing 9, the drill rotating servo motor 5 and the drilling drill 11 can be vertically moved up and down, and the assembling accuracy and rigidity are increased. Accurate drilling is possible. Also, the lifting resistance can be reduced.

  In the drilling process, casting sand and dust are scattered as in the conventional case, but only the guide pin 10 having a constant cross-sectional shape penetrates the casing 9, and the casing penetrating portion of the guide pin 10 has a dust seal. 12 is dustproof. Moreover, the inside of the casing 9 is maintained at a positive pressure. For this reason, casting sand and dust do not enter the casing 9, and the occurrence of failure can be suppressed.

  Next, the raising / lowering unit 21 of 2nd Embodiment is demonstrated. In the second embodiment shown in FIG. 2, a ball screw 23 is used for the lift transmission mechanism. The lifting transmission mechanism of this embodiment is composed of a ball screw 23, a nut 21a, and a lifting body 21b.

  As shown in FIG. 2, the ball screw 23 is provided vertically inside the casing 29, and its upper end is connected to the output shaft of a lifting / lowering servomotor 22 disposed on the ceiling of the casing 29. The lower end of the ball screw 23 is supported by a bearing 34 provided at the bottom of the casing 29.

  21a is a nut screwed with the ball screw 23, and is fixed integrally with the elevating body 21b. The elevating body 21b is guided by linear guides 24, 24 as elevating guides provided in the casing 29 so as to be movable up and down.

  Similar to the first embodiment, a vertically extending guide pin 30 is fixed to the lower end of the elevating body 21b. The casing penetrating portion of the guide pin 30 is protected by a dust seal 32. Also, compressed air is supplied from the connection port 33 to the inside of the casing 29, and the inside is maintained at a positive pressure. For this reason, even if the guide pin 30 moves up and down, foundry sand and dust do not enter the inside of the casing 9.

  A drill rotating servomotor 25 is vertically attached to the lower portion of the guide pin 30 via a horizontal arm 35, and a drilling drill 31 is coupled to the output shaft via a coupling 26.

  The lifting unit of the second embodiment also has the advantage that the drill 31 can be lifted vertically, and failure due to foundry sand or dust is less likely to occur.

  As described above, according to the present invention, even when used in a large-diameter drilling device in which casting sand is scattered and dust is generated, casting sand and dust are not caught, so that a precise drilling can be performed. Processing becomes possible.

  The elevating unit of the present invention can be mounted on, for example, a gas drilling device or a lift drilling device in a mold making line using foundry sand (for example, green sand).

  Moreover, the raising / lowering unit of this invention can be arrange | positioned above a casting_mold | template, and can perform a drilling process toward the downward direction from the upper direction of a casting_mold | template. However, the lifting unit of the present invention is not limited to this, and it may be disposed below the mold and drilled from below the mold upward.

DESCRIPTION OF SYMBOLS 1 Lifting unit 2 Servo motor 3a Rack 3b Pinion 3c Lifting body 4 Linear guide (lifting guide)
DESCRIPTION OF SYMBOLS 5 Servo motor for drill rotation 6 Coupling 9 Casing 10 Guide pin 11 Drill drill 12 Dust seal 13 Connection port 14 Moving means 15 Horizontal arm 21 Lifting unit 21a Nut 21b Lifting body 23 Ball screw 24 Linear guide (lifting guide)
25 Servo motor for drill rotation 26 Coupling 29 Casing 30 Guide pin 31 Drill drill 32 Dust seal 33 Connection port 34 Bearing 35 Horizontal arm 102 Servo motor 103 Ball screw 104 Linear guide 105 Drill rotation servo motor 106 Timing belt 107 Rotary ball spline 108 Ball spline nut 109 Casing 110 Lifting member 111 Drilling drill 112 Nut

Claims (3)

  Inside the casing, the inside of which is maintained at a positive pressure, encloses an elevating transmission mechanism that is driven by a motor to elevate the elevating body and an elevating guide for the elevating body, and the elevating body is connected to the casing via a guide pin. An elevating unit characterized in that it is coupled with an external drill bit and the casing penetration part of the guide pin is protected by dust seal.   The elevating unit according to claim 1, wherein the motor is a reduction motor or a servo motor disposed outside the casing.   The elevating unit according to claim 1 or 2, wherein the elevating transmission mechanism is a rack and pinion or a ball screw.

Images