JPS6216254Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a hanging type drilling machine.The purpose of this invention is to move an electric drill downward by the gravity of a weight to feed the cutting material. This prevents the drill from breaking at the moment of penetration.

A cylinder dedicated to lifting is fixed in the vertical axis direction to a hanging member that travels along a guide rail placed on the ceiling, etc., and an electric drill is installed via a weight at the end of the piston rod of this cylinder. Some machines drill holes by discharging the rising pressure in the cylinder and moving the electric drill downward using the gravity of a weight. In this case, the cutting feed of the drill during drilling is not forced by an actuator such as a cylinder, but because the cutting feed is performed by the gravity of a weight, excessive force is not applied to the feed during drilling, and the drill is This has the advantage of preventing cutting damage, but when drilling a through hole, the moment the drill penetrates the workpiece, the cutting resistance decreases, the feed speed increases, and the drill moves downward rapidly, so the impact causes the drill to There is a problem with cutting.

The present invention provides a drilling machine using a cutting feed method using the gravity of a weight, which solves the above problems.The feature is that the cutting feed is always controlled at a constant feed rate, and the upward return is controlled at a rapid feed rate. A hydraulic shock absorber is provided between the fixed part and the movable part.

Embodiments of the present invention will be described below with reference to the drawings.
In FIG. 1, reference numeral 1 indicates a guide rail arranged on a ceiling or the like, and reference numeral 2 indicates a hanging member that can run and move along the guide rail 1 and can also run and move in a direction intersecting the guide rail 1. A cylinder 3 is fixed to the hanging member 2 in the vertical axis direction, and a weight 5 is attached to the end of the piston rod 4. Furthermore, a support body 6 is provided on the weight 5, and an electric drill 7 to which a drill 8 can be attached and detached is supported on the support body 6.

A support member 9 is fixed in the horizontal direction on the cylinder 3 on the fixed side, and a support member 10 is fixed on the weight 5 on the movable side so as to face the support member 9. , 1 hydraulic shock absorber between 10
1 is attached.

The structure of this buffer 11 is as shown in FIG.
It consists of a cylinder 12, a piston 13, and a piston rod 14, and the cylinder 12 is filled with oil. The piston 13 also has an oil passage that communicates the upper and lower chambers of the cylinder 12 that are partitioned by the piston 13, and this oil passage includes an orifice 15 and an orifice 15.
A check valve 16 that opens to allow oil to flow only when the piston 13 is raised is provided in a bypass passage that bypasses the piston 5. The upper end of the cylinder 12 is attached to the fixed support member 9, and the piston rod 14 is attached to the movable support member 1.
Attached to 0. It is also possible to attach the piston rod 14 to the fixed support member 9 and the cylinder 12 to the movable support member 10 with the check valve 16 in the opposite direction to the above, and the same function as described above can be achieved. .

Since the present invention has the above-described structure, the machine body with cylinders 3 and below can be moved freely in the X-Y coordinates by the hanging member 2, and the drill 8 can be moved to a predetermined drilling position on the workpiece. position. Thereafter, when the start switch is operated, the electric drill 7 rotates and discharges the pressure that is raising the piston in the cylinder 3. As a result, the electric drill 7 starts to move downward due to the gravity of the weight 5. The descending speed of the electric drill 7 is always controlled to a constant speed by a buffer 11. That is, as the weight 5 moves downward, the piston 13 of the shock absorber 11 also moves downward, and at this time, the oil in the lower chamber of the cylinder 12 flows through the orifice 15 into the upper chamber. Therefore, the downward speed is controlled to be constant by the orifice 15, and this becomes the cutting feed rate. This cutting feed rate is maintained even if the cutting resistance at the moment when the drill 8 penetrates the workpiece decreases.

On the other hand, when a predetermined hole has been drilled, a sensor (not shown) detects this and supplies upward pressure to the cylinder 3, causing the electric drill 7 to rise and return to its original position. At this time, the check valve 16 of the piston 13 of the shock absorber 11 is opened and a large amount of oil flows from the upper chamber to the lower chamber, so that the piston 13 of the shock absorber 11 can be returned to its original position by rapid forwarding.

As described above, according to the present invention, the cutting feed during drilling is performed at a constant speed due to the gravity of the weight and the movement resistance of the oil in the shock absorber, which prevents the drill from breaking due to excessive feed force. Even in the case of a through-hole where the cutting resistance is reduced, a constant speed is maintained by the buffer even at the moment when the drill penetrates, which has the advantage of preventing the drill from being damaged.

Further, in the above-mentioned shock absorber, oil is sealed in the upper and lower chambers of a cylinder partitioned by the piston, and an orifice that communicates the upper and lower chambers with the piston, and a bypass passage that bypasses this orifice are provided when the piston rises. Since the structure is equipped with a check valve that only allows oil to pass through, there is no need for any equipment such as hydraulic piping, electromagnetic valves, or control valves, especially in the drilling machine of the present invention that travels along guardrails. This has the special effect of simplifying the configuration.

[Brief explanation of the drawing]

Figure 1 is a front view of the present invention, Figure 2 is Figure 1-
FIG. 1... Guide rail, 2... Hanging member, 3...
...Cylinder, 4...Piston rod, 5...Weight, 7...Electric drill, 11...Buffer.

Claims (1)

[Scope of utility model registration request] In a drilling machine in which a cylinder is fixed in the vertical axis direction to a hanging member that travels along a guide rail, and an electric drill is attached to the piston rod end of the cylinder via a weight, the cylinder and the weight are connected to each other. Horizontal support members are fixedly opposed to each other, and a buffer is provided between both support members, and this buffer is
Oil is sealed in the upper and lower chambers of a cylinder defined by a piston that is integrally provided with a piston rod that projects outside from one cylinder end, and an orifice that communicates the upper and lower chambers with the piston, and a bypass that bypasses this orifice. A drilling machine characterized in that the passage is equipped with a check valve that allows oil to flow only when the piston is ascending.