JPS643581B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a ram adjustment mechanism for a hydraulic drilling machine for drilling holes in metal plates such as steel plates, copper plates, and aluminum plates. This type of drilling machine is small, lightweight, and portable, and is suitable for drilling directly at the work site. Used for drilling holes in boards, especially for electrical installation work,
It has a wide range of uses, including piping work and various parts installation work. This punching machine uses a hydraulic pump to operate a hydraulic ram, and punches a hole in a metal plate by the shearing action of a male blade and a female blade. In this type of drilling machine, the male and female blades are replaced depending on the diameter of the punched hole.

In conventional drilling machines, in order to punch holes of a predetermined size in a metal plate, the hydraulic pump is first connected to the hydraulic ram by a coupler, and the tip of the ram piston slides inside the ram cylinder. Screw in a large bolt of the specified length. Depending on the hole diameter, if necessary, add a small bolt with a smaller diameter than this large bolt to the large bolt. Next, female blades are inserted into these bolts through a predetermined number of sleeves. Next, make the tip of the bolt protrude through the pilot hole drilled in the metal plate, screw the male blade into this, and complete the setting by sandwiching the metal plate between the female and male blades.

Next, the return valve of the hydraulic pump is closed and the pump is driven to send pressurized oil to the ram, and the male blade sinks into the female blade, punching a predetermined hole in the metal plate.

When punching is completed, open the return valve of the hydraulic pump to return the pressure oil in the ram to the hydraulic pump, and then take out the male blade, the remaining pieces of the punching board remaining in the female blade, the female blade, and the sleeve in order. The work is completed by removing the large and small bolts.

The stroke of a hydraulic ram is limited due to its structure, so in conventional drilling machines, the ram stroke range was adjusted by using different sleeves with replacement male and female blades. Since it takes time to replace the replaceable blade, workability is extremely poor, and if the wrong sleeve is used for the replaceable blade, the punching will not be performed correctly and there is a risk of damaging the hydraulic ram and the replaceable blade.

The present invention seeks to eliminate the above-mentioned drawbacks of conventional drilling machines.

An object of the present invention is to provide a ram adjustment mechanism for a drilling machine that does not require the use of a sleeve to adjust the stroke range when attaching a replaceable blade.

Another object of the present invention is to provide a ram adjustment mechanism for a drilling machine that allows for rapid replacement of blades.

Another object of the present invention is to provide a ram adjustment mechanism for a drilling machine that allows for quick and easy adjustment of the stroke range of a hydraulic ram.

Still another object of the present invention is to adjust the ram of a drilling machine by providing means for rotating the movable screw, and by operating the movable screw, the movable screw can be rapidly moved forward and backward with respect to the ram piston. It is to provide a mechanism.

To achieve these objectives, the invention provides a ram driven by a hydraulic pump and a movable screw for attaching a replaceable blade, the ram having a coupler for connection with the hydraulic pump. It consists of a substantially cylindrical ram cylinder, a ram piston that can slide within the ram cylinder and has a female threaded hole in the axial direction, and a coil spring for returning the ram piston to its home position, and the screw A ram adjusting mechanism for a hydraulic drilling machine is provided, which is capable of moving forward and backward by engaging with a female threaded hole of a ram piston, and is equipped with means for rotating a screw at one end.

Next, embodiments of the present invention will be described in detail with reference to the accompanying drawings. In this embodiment, it is assumed that the hydraulic pump used in the drilling machine is a manual hydraulic pump.

The drilling machine with a hydraulic ram according to the invention shown in FIG. 1 is connected to a manual hydraulic pump 4 via couplers 2, 18.

This manual hydraulic pump 4 has a conventionally well-known structure, including an oil tank 6, a return valve 8, and an operating lever 1.
0, is equipped with a high-pressure hose 12 and a male coupler 2 at the end of the high-pressure hose, and by operating the handle 10 up and down, high-pressure oil is sent to various devices connected via the coupler 2. This hydraulic pump itself is not a subject of the present invention and will not be described in detail.

The ram adjustment mechanism of the hydraulic drilling machine according to the invention, which is illustrated in detail in FIG.
It is equipped with a hydraulic ram 14 driven by a hydraulic ram 14 and a movable screw 16 for attaching a replaceable blade.
The hydraulic ram 14 includes a substantially cylindrical ram cylinder 20 having a female coupler 18 for connection with a hydraulic pump, and a large diameter shoulder surface and a small diameter shoulder surface for supporting a replaceable blade at the tip of the ram cylinder 20. 2
4 and 24a are provided. Each of the ram cylinders is provided with a small diameter hole 26 and a large diameter hole 28, and a ram piston 30 is mounted in these holes so as to slide in the axial direction when pressurized with oil. Each of the ram pistons 30 has a small diameter portion 32 and a large diameter portion 34, and an O-ring 3 is located near the tip of the small diameter portion.
6 and a backup spring 38, and an O-ring 40 and a backup spring 42 are attached to the large diameter portion, respectively, to prevent leakage of pressure oil. A generally cylindrical cap 44 is attached to the rear end of the large bore 28 of the ram piston 30 at its flange 46 by a cap retaining ring 48. A coil spring 50 is installed between the large diameter portion 34 of the ram piston 30 and the cap 44 for returning the ram piston to its home position.

A female threaded hole 52 is provided in the ram piston 30 passing through the ram piston in its axial direction, and a movable screw 16 having a male thread is engaged with this threaded hole. Replaceable blades, namely a female blade 54 and a male blade 56, are attached to one end of the movable screw 16, and a means for rotating the same is provided to the other end of the screw.

The means for rotating the moving screw 16 include:
For example, as shown in FIG. 2, it comprises a handle arm 60 attached to the end of the screw by a bolt 58, and a handle 64 attached at right angles to the tip of this arm by a bolt 62. Thus, by rotating the handle 64 to the right or left, the movable screw 16 can be moved relative to the ram piston 30. The handle arm 60 is provided with mutually parallel flat parts 66, 66a, and when the movable screw 16 is rotating heavily, the screw can be forcibly rotated by applying a tool such as a spanner to the flat parts. can.

An alternative means for rotating the moving screw, as shown in FIG. . A retaining ring 72 is attached to both ends of this pin to prevent it from falling off. To turn the movable screw 16, this pin 70 can be slid until it abuts against the retaining ring 70, and the protruding pin can be used as a lever. In this embodiment, a mutually parallel flat portion 74 is provided at one end of the movable screw 16, and when the screw 16 is rotating heavily, a tool such as a spanner is applied to the flat portion to forcibly move the screw. can be rotated.

The small bolt 76 shown in FIG. 4 is for attaching a small-diameter replaceable blade, and this is a female screw hole 78 (see FIG. 2) provided at the tip of the movable screw 16.
It has a thread 80 for screwing into the blade and a thread 82 for attaching a replaceable blade, and a knurl 84 for turning a small bolt is provided between each of the threads. A groove 86 is provided at one end of the small bolt into which a screwdriver is inserted when installing or removing the small bolt.

To make a hole in a metal plate using the punching machine of the present invention, first, the male coupler 2 of the manual hydraulic pump 4 is connected to the female coupler 18 of the ram cylinder 20. Next, a pilot hole 88 (see FIG. 2) of approximately 10 mm in diameter is drilled at the hole location in the metal plate 22.

When drilling a hole with an actual diameter of 30 mm or less, a small bolt 76 shown in FIG. 4 is screwed into the female threaded hole 78 at the tip of the movable screw 16. Next, turn the handle at the other end of the movable screw to move it back until the screw 16 is hidden from the tip of the ram cylinder shoulder surface 24a.

In this way, the female blade 54 is inserted into the small bolt 76 until it abuts against the shoulder surface 24a of the ram cylinder, then the small bolt is made to protrude into the prepared hole 88 of the metal plate, and the male blade 56 is screwed into the tip of the protruded small bolt 76.

Next, the handle 64 is turned to move the screw 16 backward until the male blade 56 hits the metal plate 22.

In this state, the return valve 8 of the manual hydraulic pump 4
is closed and the operating lever 10 is moved up and down to send pressurized oil into the ram cylinder 20, the ram piston 30 and therefore the movable screw 16 that engages with it.
moves backward, the male blade 56 sinks into the metal plate 22, and a hole of a predetermined diameter is punched in the metal plate by shearing action with the female blade 54.

When drilling a hole with an actual diameter of 31 mmφ or more, use a female blade 5 with a specified punching diameter as shown in Figure 2.
4 is inserted until it abuts against the large-diameter shoulder surface 24 of the ram cylinder, then the movable screw 16 is made to protrude from the pilot hole 88 of the metal plate 22, and the male blade 56 is screwed into the tip of the protruding screw 16.

Next, the screw 16 is moved backward by turning the handle 64 until the male blade 56 hits the metal plate 22.

In this way, the lever 10 of the manual hydraulic pump 4 is operated to punch out a hole of a predetermined diameter in the metal plate.

After drilling is completed, when the return valve 8 of the manual hydraulic pump 4 is opened, the pressure oil remaining in the ram cylinder 20 is forcibly returned to the pump by the restoring action of the coil spring 50, and the ram piston is returns to its original position. After the ram piston returns, the male blade 56 is removed, and the remaining pieces of the punched plate remaining in the female blade 54 are then removed to complete the operation.

According to the invention, by means for rotating the moving screw, for example by turning a handle,
Since the screw can be moved forward or backward quickly relative to the ram piston, there is no need for a sleeve for adjusting the stroke range when attaching the replaceable blade in the conventional device.

Furthermore, by turning this handle, the movable screw can be quickly moved forward or backward, so that replacement of the replaceable blade and adjustment of the stroke range of the hydraulic ram can be performed quickly and easily.

Furthermore, when the screw becomes difficult to rotate or when the handle becomes difficult to operate, the screw can be forcibly rotated using a tool such as a spanner.

Furthermore, the tip of the movable screw has a female threaded hole for connecting a small bolt, so by adding a small bolt to the screw, you can use replaceable blades from small to large diameters.
A wide range of drilling work is possible.

The hydraulic ram of the drilling machine according to the invention is lightweight,
It is small and convenient to carry, and allows for easy on-site drilling work regardless of location.

In addition, since the ram piston is driven by hydraulic pressure,
A large output can be obtained, and since the ram cylinder has a built-in coil spring that forces the ram piston to return, by opening the return valve of the hydraulic pump after drilling, pressure oil can flow into the pump. and thus the ram piston can automatically return to its original position.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing a hydraulic drilling machine according to the present invention connected to a manual hydraulic pump, and FIG. 2 is a ram adjustment mechanism of the hydraulic drilling machine according to the present invention, which includes a hydraulic ram and a movable screw. FIG. 3 is a front view showing another embodiment of the movable screw, and FIG. 4 is a front view of a small bolt. 2, 18... Coupler, 4... Manual hydraulic pump, 14... Hydraulic ram, 16... Moving screw, 20... Ram cylinder, 30... Ram piston, 44... Cap, 50... Coil spring, 52...Female screw hole, 54...Female blade, 56...
...Male blade, 60...Handle arm, 64...Handle, 68...Small hole, 70...Pin, 76...Small bolt.

Claims (1)

[Scope of Claims] 1. A substantially cylindrical ram comprising a hydraulic ram driven by a hydraulic pump and a movable screw for attaching a replaceable blade, the ram having a coupler for connecting with the hydraulic pump. cylinder and
In a hydraulic drilling machine consisting of a ram piston that can slide within the ram cylinder and a coil spring for returning the ram piston to its home position, the ram piston 30 penetrates through its center and extends in the axial direction. is provided with a female threaded hole 52 in the ram piston, and the movable screw 16 is provided with a female threaded hole 52 in the ram piston.
A hydraulic drilling machine characterized in that it can move forward and backward in the axial direction by engaging with the screw, and that this forward and backward movement is performed by means 60 and 64 for rotating the screw attached to one end of the screw. Machine ram adjustment mechanism. 2 A large diameter shoulder surface and a small diameter shoulder surface are provided at the tip of the ram cylinder, and the large diameter shoulder surface functions as a support surface for a large diameter replaceable blade, and the small diameter shoulder surface functions as a support surface for a small diameter replaceable blade. The adjustment mechanism according to claim 1, characterized in that the adjustment mechanism is operative. 3. Adjustment according to claim 1 or 2, characterized in that the means for rotating the movable screw comprises a handle arm and a handle mounted approximately at right angles to the handle arm. mechanism. 4. Adjustment mechanism according to claim 3, characterized in that the handle arm is provided with a flat portion that can be engaged with a tool. 5. Claim 1 or 5, characterized in that the means for rotating the movable screw comprises a small hole provided near the end of the screw, and a pin that can slide within the small hole. Adjustment mechanism according to paragraph 2. 6. The adjusting mechanism according to claim 5, wherein one end of the movable screw is provided with a flat portion that can be engaged with a tool. 7. The movable screw has a female threaded hole at the other end thereof, and a small bolt with a diameter smaller than that of the screw can be attached to the female threaded hole so that a wide range of replaceable blades from small diameter to large diameter can be used. Adjustment mechanism according to item 1.