JPH07284877A - Hydraulic control riveting machine - Google Patents

Abstract

PURPOSE:To prevent mistake in riveting and to improve efficiency. CONSTITUTION:In the hydraulic control riveting machine adjustable for caulking pressure, a lower anvil 7, in which a length to be inserted in a lower anvil holder 8 is different depending on the prescribed caulking pressure, is used, the inserted length is read by the sensor 25 arranged to the lower anvil holder 8, a caulking pressure is automatically set. Also, by setting an upper anvil to intermediately stopped at an arbitrary position, the interference of between a work and upper anvil is prevented, further, riveting efficiency is improved as well.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hydraulically controlled tacker applied to a rivet tacking work in assembling an aircraft or the like.

[0002]

2. Description of the Related Art FIG. 7 is a cross-sectional view of a conventional pneumatic tacker and a tacking process diagram. In the pneumatic tacker, the lower anvil (7) is raised every time the plate thickness (length of the rivet (21)) of the work (22) is changed due to the structure, and the upper anvil (6) is raised or lowered each time. Then, the caulking height adjustment was repeatedly performed until the caulking height of the rivet was optimum. As described above, the pneumatic tacker requires an adjustment of the caulking height every time the plate thickness of the work (the length of the rivet) changes, so this adjustment is time-consuming and inefficient.

In order to solve the above problems, it is conceivable to adopt a hydraulic control system as shown in FIG. With the hydraulic control method, the caulking pressure is changed for each rivet size (diameter), and the rivet is caulked by reliefing at the set pressure, thereby eliminating the need to adjust the caulking height.

[0004]

The above-mentioned hydraulic setting type nailer also has the following problems to be solved. 1) If the pressure setting for the rivet size (diameter) is wrong, there is a risk of breaking the product due to excessive caulking. 2) As shown in FIG. 9, when the work (22) is an angle member or the like, the upper anvil (6) may cause the product (2
There is a risk of damage by interfering with 2). 3) Since it is necessary to move the upper cylinder from the ascending end to the crimping position every time when crimping, efficiency in continuous driving is poor.

[0005]

In order to solve the above-mentioned conventional problems, the present inventor has proposed a hydraulic control nailer for driving a rivet into a work between an upper anvil and a lower anvil. Means for detecting the insertion length of the lower anvil inserted in the anvil holder, means for controlling the caulking pressure acting on the upper anvil based on the detected value, and provided at the lower end of the entire stroke of the upper anvil. Lowering end sensor, a working end sensor that is provided between the upper and lower ends of the entire stroke and whose vertical position can be adjusted, and stops the upper anvil at the position detected by the lowering end sensor and the working end sensor. The present invention proposes a hydraulically controlled nailer characterized by including means.

[0006]

Since the present invention employs the hydraulic caulking method, the relief can be performed with a predetermined caulking pressure, and the caulking height adjustment is unnecessary.

Further, since the insertion length of the lower anvil inserted in the lower anvil holder is detected and the caulking pressure is controlled based on the detected value, the lower anvil having a different holder inserting portion length for each predetermined caulking pressure is used. If prepared, the caulking pressure will be automatically controlled, and the caulking pressure setting error can be prevented.

Furthermore, since the upper anvil can be stopped at the lower end of the entire stroke of the upper anvil and the working end above which the height can be adjusted to an arbitrary height, interference between the work and the upper anvil can be prevented, and a rivet is struck. Efficiency is also improved.

[0009]

1 is a perspective view showing a hydraulically controlled nailer according to an embodiment of the present invention, FIG. 2 is a side view thereof, and FIG. 3 is a front view thereof. FIG. 4 is a vertical sectional view showing the lower anvil insertion portion in this embodiment, and FIG. 5 is an explanatory view showing an intermediate stop position of the upper anvil. FIG. 6 is a hydraulic circuit diagram of this embodiment.

The operation sequence of this apparatus will be described below. [1. Preparation / Positioning Step] First, the worker inserts and fixes the upper anvil (6) into the upper anvil holder (5) attached to the upper cylinder (2). Further, the lower anvil (7) is inserted into the lower anvil holder (8). The lower anvil (7) is prepared for each diameter (each set crimping pressure) of the rivet (21), and the insertion length into the lower anvil holder (8) is changed as shown in FIG. Further, the lower anvil holder (8) is embedded with four caulking pressure setting sensors (25) for detecting the difference in the length of the insertion portion of the lower anvil (7), and these are set in the control panel (12). A preset caulking pressure setting volume is selected. Therefore, the caulking pressure (hydraulic relief pressure) of the rivet (21) is automatically set only by inserting the lower anvil (7) prepared for each rivet diameter into the lower anvil holder (8).

Next, a hole is preliminarily drilled and rivets (2
The work (22) in which 1) is inserted is applied to the lower anvil (7). Then, the working end (intermediate stop position) is selected by the switch of the operation box (11).
Next, by stepping on the foot pedal (20) once, the upper cylinder (2) starts descending. The dog (15) attached to the slide bar (4) provided on the front surface of the upper cylinder (2) and operating in conjunction with the upper cylinder (2) is a working end (intermediate stop position) sensor (17). When it is detected by, the descent is stopped. That is, this is the intermediate stop position. Working end (intermediate stop position)
The detection position of the sensor (17) can be changed to any height on the slide rail (18). [2. Rivet Caulking Step] When the foot pedal (20) is depressed, the upper cylinder (2) is further lowered and the rivet (21) is caulked. At this time, as shown in FIG. 6, when the pressure sensor (23) detects that the pressure (caulking pressure) on the inlet side of the upper cylinder (2) has reached the pressure given to the control panel (12) in advance, The proportional electromagnetic pressure control valve (24) operates to relieve the oil pressure on the inlet side, and the caulking is automatically completed and the upper cylinder (2) rises to the working end (intermediate stop position). When the sensor (17) detects the dog (15), the ascending is stopped. Next, when the operator applies the next rivet and depresses the foot pedal (20), the same operation as described above is performed again to crimp the rivet. That is, when the working end (intermediate stop position) is selected, the upper cylinder (2) does not return to the ascending end sensor (14), so that the rivet can be driven with less time loss and the efficiency is improved. When the caulking work is completed, the operation box (11)
The upper cylinder (2) is raised by setting the switch of the upper end to the rising end, and the rising end detection sensor (14) provided on the front surface of the upper cylinder (2) causes the dog (1) to move.
When 5) is detected, the rising is stopped.

If the foot pedal (20) is removed during the lowering operation of the upper cylinder (2), the upper cylinder (2) immediately rises, so that damage to various works can be prevented. Even in the case of driving tacks such as angle materials, if the working end (intermediate stop position) is set to a position lower than the upper end (22a) of the work (22) as shown in FIG. There is no worry of damage due to.

Besides, the protective cover (3) of the working portion of the upper cylinder (2) eliminates the risk of being pinched, and the main body (1) and the hydraulic unit (13) are fixed on the base (10). It is a compact device. Further, in the present embodiment, the hydraulic pump and the motor, which are noise sources, are oil units (oil immersion type) that are struck by oil, so that low noise of 60 to 65 dB can be realized.

[0014]

According to the present invention, the following effects can be obtained. 1) Since it is a hydraulic control system, the rivet can be caulked automatically by setting the caulking pressure of the rivet, and it is not necessary to adjust the caulking height of the rivet. 2) Since the caulking pressure detection sensor of the lower anvil holder can automatically select and control the caulking pressure, it is possible to prevent the caulking pressure setting error. 3) Since the upper anvil can be stopped intermediately at any position, it is possible to prevent the work and the anvil from interfering with each other.
Moreover, the driving efficiency is also improved.

[Brief description of drawings]

FIG. 1 is a perspective view showing a hydraulically controlled tacker according to an embodiment of the present invention.

FIG. 2 is a side view showing the above embodiment.

FIG. 3 is a front view showing the above embodiment.

FIG. 4 is a vertical cross-sectional view showing a lower anvil insertion portion in the above embodiment.

FIG. 5 is an explanatory view showing an intermediate stop position of the upper anvil in the above embodiment.

FIG. 6 is a hydraulic circuit diagram of the above embodiment.

FIG. 7 is a cross-sectional view showing a conventional pneumatic tacker and a tacking step diagram thereof.

FIG. 8 is a cross-sectional view showing a conventional hydraulically controlled tacker and a tacking process diagram thereof.

9 is a diagram for explaining the interference between the upper anvil and the product in the hydraulically controlled nailer shown in FIG.

[Explanation of symbols]

 (1) Body frame (2) Upper cylinder (3) Protective cover (4) Slide bar (5) Upper anvil holder (6) Upper anvil (7) Lower anvil (8) Lower anvil holder (9) Strut (10) Base (11) Operation box (12) Control panel (13) Hydraulic unit (14) Ascending end sensor (15) Dog (16) Falling end sensor (17) Working end (intermediate stop) sensor (18) Slide rail (19) Hydraulic pressure Manifold (20) Foot pedal (21) Rivet (22) Work (Product) (23) Pressure sensor (24) Proportional electromagnetic pressure control valve (25) Caulking pressure setting sensor (26) Oil immersion motor

Claims (1)

[Claims] 1. A hydraulically controlled tacker for driving a rivet into a work between an upper anvil and a lower anvil, and means for detecting a length of an inserted portion of the lower anvil inserted into a lower anvil holder. , A means for controlling the caulking pressure acting on the upper anvil based on the detected value, a descending end sensor provided at the lower end of the entire stroke of the upper anvil, and an upper and lower end provided at the upper and lower ends of the entire stroke. A hydraulically controlled tacker, comprising: a work end sensor whose position is adjustable; and means for stopping the upper anvil at a position detected by the descending end sensor and the work end sensor.