KR100655321B1 - Table clamp/unclamp motion sensing device of maching center - Google Patents

Abstract

An apparatus for sensing clamp/unclamp motion of a table of a machining center is provided to improve the sensing performance of the clamp and unclamp motion and to reduce the processing time by sensing the amplified stroke distance by a switch. An apparatus for sensing clamp/unclamp motion of a table of a machining center comprises a housing(401) combined at the table base; a rod(403) contacted with the lower surface of the pallet base; a rod spring(402) pushing the rod to the upper side; a bracket combined with the table base at the lower side of the housing; a sensing plate(406) whose one end is fixed by a pin and upper surface is contacted with the lower end of the rod; a sensing plate spring for pushing the sensing plate to the upper side; a switch bracket(410) combined at the outer surface of the bracket; and a switch(411) inserted in the switch bracket. The rod contains a housing cover(404) combined at the upper side of the housing to prevent the rod spring from being separated.

Description

Table Clamp / Unclamp Motion Sensing Device of Maching Center

1 is a cross-sectional view showing a state in which the table clamp / unclamping motion detection apparatus according to the present invention is mounted.

2 is a cross-sectional view of the table clamp / unclamping motion detection apparatus according to the present invention

Figure 3 is a perspective view showing a state in which the table clamp / unclamping motion detection apparatus according to the present invention is coupled with the pallet base

10: table base 20: pallet base

30: cylinder 40: clamp / unclamp motion detection device

401 housing 402 load spring

403: rod 404: housing cover

405; Bracket 406: Sensing Plate

407: pin 408: sensing plate spring

409 plate 410 switch bracket

411: switch

The present invention relates to a device for detecting the clamp / unclamping operation of the table seating the workpiece in the machining center, and more particularly, the clamping / unclamping operation by the hydraulic pressure at the same time the table of the machining center is turned into a servo The present invention relates to a device for detecting a clamp / unclamp operation of a table and giving an operation completion signal for the next operation in a device that performs the operation.

The machining center is equipped with an automatic tool changer (ATC) for multi-axis machining, an automatic tool changer (ATC) and an automatic pallet changer (APC) for changing work pallets. In addition, small quantities of small quantities of various varieties may be processed in sufficient quantities.

The machining center is also equipped with pallet angular splitting. That is, after lifting the pallet base from the table base through the cylinder by a predetermined distance (unclamp) and rotating it by a desired angle, the pallet base is lowered onto the table base again and clamped (clamped). The pallet base must be clamped to the table base so that the workpiece on the pallet can be fixed and machined.

 The clamp / unclamp operation of the current table is determined to have been completed after a time period longer than a predetermined time interval required for the clamp / unclamp operation of the table, or is determined by installing a clamp / unclamp detection device on the table base. However, in the case of judging by the time interval, the non-cutting time of the machining center is increased and thus the overall machining time is increased. In case of judging by installing the sensing device, it is difficult to detect because the vertical movement distance of the pallet base is small in the clamp / unclamp operation. In addition, in the case of using the sensing device, the unclamping state may be detected by using the moving shaft of the sensing device to rise by the elasticity of the spring, thereby deteriorating the reliability of the machine as the spring ages.

SUMMARY OF THE INVENTION The present invention provides a clamp / unclamp operation detecting device for a table that allows the switch to detect a switch by enlarging the clamp / unclamp operation stroke of the table.

That is, the present invention, the housing coupled to the table base; A rod inserted into the housing to contact the bottom surface of the pallet base; A load spring inserted into the housing to push the rod upward; A housing cover coupled to the housing upper side to prevent separation of the rod and the load spring; A bracket coupled to the table base under the housing; A sensing plate inserted into the bracket and fixed to one end by a pin so that an upper surface thereof contacts the lower end of the rod; A sensing plate spring inserted into the bracket to push the sensing plate upward; Plate coupled to the upper side of the bracket to prevent the separation of the sensing plate; A switch bracket coupled to the bracket outer surface; And a switch inserted into the switch bracket and connected to one end opposite to the one end of the sensing plate to which the pin of the sensing plate is installed.

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

1 is a side cross-sectional view showing a state where the clamp / unclamp detection device according to the present invention is mounted.

1 shows the clamped state in which the pallet base 20 is coupled to the table base 10.

In order to rotate the pallet base 20 by a desired angle, the cylinder 30 expands and moves the pallet base 20 upwards by a predetermined distance from the table base 10 so as to be separated from each other (unclamped state). The separated pallet base 20 is rotated by a desired angle by a servomotor (not shown) and then coupled to the table base 10 again (clamped state). During this process, the clamp and unclamp state of the table is detected by the clamp / unclamp detection device 40.

Details of the clamp / unclamp detection device 40 are shown in FIG. The clamp / unclamp detection device 40 includes a housing 401 coupled to the table base 10, a rod 402 inserted into the housing 401 and contacting the bottom surface of the pallet base 20, and inside the housing 401. A housing cover 404 and a housing 401 which are inserted into the housing 401 and coupled to an upper portion of the housing 401 to prevent the rod spring 403, the rod 402, and the rod spring 403 from being pushed upward. Bracket 405 coupled to the table base 10 from the lower side, the sensing plate 406 is inserted into the bracket 405 and one end is fixed by the pin 407, the upper surface is in contact with the bottom of the rod 402, A sensing plate spring 408 inserted into the bracket 405 to push the sensing plate 406 upward, a plate 409 coupled to the upper side of the bracket 405 to prevent the sensing plate 406 from being separated, and a bracket ( 405) the switch bracket 410 and the switch bracket 410 coupled to the outer surface And inserted into the unit, and a switch 411 coupled to the pin 407 is connected to the opposite end and the one end is provided in the sensing plate 406.

As shown in FIG. 3, the rod 402 of the clamp / unclamp sensing device 40 is in contact with the bottom surface of the pallet base 20. The rod 402 is inserted into the housing 401 and pushed upward by the load spring 403 and prevented from escaping out of the housing 401 by the housing cover 404. The height at which the rod 402 rises is limited by the height of the pallet base 20. That is, the rod 402 is in a relatively low position when in the clamped state and at a relatively high position when in the unclamped state. The difference between the heights of the rods 402 in the clamped state and the unclamped state is called 'Δz'.

As shown in FIG. 2, the bottom of the rod 402 abuts the sensing plate 406 in the bracket 405. The sensing plate 406 is fixed at one end by the pin 407, pushed upward by the sensing plate spring 408, and prevented from escaping out of the bracket by the plate 409. The inclination angle of the sensing plate 406 depends on the height of the pallet base 20 where the rod 402 and the rod 402 are in contact. That is, the rod 402 is in a relatively low position in the clamped state so that the sensing plate 406 is relatively downward from the pin 407, and the rod 402 is in a relatively high position in the unclamped state. Plate 406 is relatively upward from pin 407.

The distance from the pin 407 of the sensing plate 406 to the end of the opposite sensing plate 406 is referred to as 'L' and the distance from the pin 407 to the contact with the rod 402 of the sensing plate 406. Is called 'l'. The rod 402 rises Δz as it transitions from the clamped state to the unclamped state, so that the opposite end of the pin 407 of the sensing plate 406 rises Δz × L / l. L is set several times larger than l, thus amplifying the small clamp / unclamp working stroke distance several times.

The opposite end of the pin 407 of the sensing plate 406 is connected to the switch 411 in the switch bracket 410. By the operating stroke distance amplified by the sensing plate 406, the switch 411 can detect the clamp / unclamp signal of the table with less error. Therefore, the machining center can reliably determine whether the angular splitting process is in progress or completed, and can determine whether to proceed with the next process.

The clamp / unclamp operation of the table in the machining center is difficult to detect movement due to the small stroke length. However, when using the clamp / unclamp motion detection device according to the present invention, the stroke distance is amplified can be detected by the switch, and thus the clamp / unclamp operation can be detected directly without error. Thus, the time taken for the process can be shortened and malfunctions can be reduced.

Various modifications and variations are possible to those skilled in the art without departing from the spirit and scope of the invention. Accordingly, the appended claims will cover such modifications and variations as fall within the spirit of the invention.

Claims (6)

A housing 401 coupled to the table base 10; A rod 403 inserted into the housing 401 to contact the bottom surface of the pallet base 20; A load spring 402 inserted into the housing 401 to push the rod 403 upward; A bracket 405 coupled to the table base 10 under the housing 401; A sensing plate 406 inserted into the bracket 405 and having one end fixed by a pin so that an upper surface thereof contacts the lower end of the rod 403; A sensing plate spring 408 inserted into the bracket 405 to push the sensing plate 406 upward; A switch bracket 410 coupled to the outer surface of the bracket; And And a switch 411 inserted into the switch bracket 410 and connected to one end opposite to the one end of the sensing plate 406 opposite to the one end of the sensing plate 406 installed therein. . The apparatus of claim 1, wherein the rod (403) and the sensing plate (406) perform a vertical movement according to the vertical movement of the pallet base (20). The method of claim 1, wherein the switch 411 is characterized in that for measuring the clamp and unclamp state of the pallet base by a vertical movement of one end connected to and coupled to the switch 411 of the sensing plate 406. Table clamp / unclamp motion detection device. The method of claim 2, wherein one end connected to and coupled to the switch 411 of the sensing plate 406 performs vertical movement at a vertical movement distance amplified than the vertical movement distance of the pallet base 20. Table clamp / unclamp motion detection device. The table clamp / unlock as set forth in claim 1, further comprising a housing cover (404) coupled above the housing (401) to prevent separation of the rod (403) and the rod spring (402). Clamp motion detection device. The apparatus of claim 1, further comprising a plate (409) coupled to an upper side of the bracket (405) to prevent the sensing plate (406) from being separated.

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