JPH06248476A - Surface treatment device having variable stroke mechanism - Google Patents

Abstract

PURPOSE:To vary the reciprocating strokes of a housing means such as cage, and to enable the effective execution of surface treatments and water draining action at a short period of time with the simple construction of the device which subjects the works such as screws, housed in this housing means to plating, coating, washing and other surface treatments by immersing the works in a treating liquid and reciprocating the works CONSTITUTION:A reciprocating crank mechanism 10 is used as reciprocating device of the work housing means 1. A lever shaft 12 is freely turnably inserted into the eccentric position of a revolving shaft 11 of the reciprocating crank mechanism 10. A phase changing means 22 for relatively turning this lever shaft with the revolving shaft 11 is installed. The crank 7 of the reciprocating crank mechanism 10 is fixed to the shaft end of the lever shaft 12. The reciprocating strokes of the housing means 1 are varied by turning the lever shaft 12 within the revolving shaft 11. The revolving shaft 11 and the lever shaft 12 are fitted without clattering by installing circular conical fitting parts 14, 15 in the immediate proximity of the part where the crank 7 is mounted.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to plating and coating of a work, such as a screw or a metal plate, which is housed in a housing (eg, a housing basket), by immersing the work in a processing liquid such as a plating liquid or cleaning water. , Cleaning and other surface treatment devices.

[0002]

2. Description of the Related Art A surface treatment apparatus of this type averages a large number of works contained in a container and exposes the work to the treatment solution, and causes the treatment solution to uniformly contact and flow on the surface of the work having a complicated shape. Therefore, a reciprocating mechanism for reciprocating the container in the processing liquid is provided.

As the reciprocating mechanism, a reciprocating crank mechanism (piston crank mechanism) for converting the rotational movement of the motor into the reciprocating movement of the reciprocating shaft for mounting the container is usually used, and an inverter motor is used as the motor. Reciprocating speed (cycle) according to the size of the work and the type of processing
You can change. As the reciprocating motion, it is usual to superimpose reciprocating motion in each direction such as reciprocating up-and-down movement, reciprocating rotation, and reciprocating rocking.

In the conventional surface treatment apparatus of this type, the reciprocating mechanism of the container is not provided with the variable stroke mechanism. Further, the reciprocating crank mechanism, which is often used as the reciprocating mechanism, has a problem that the mechanism becomes complicated when trying to make the stroke variable. When the stroke is variable with the normal reciprocating crank mechanism, as shown in FIG.
A slider 4 which is movable and fixed to the rotating shaft 11 in its radial direction.
1 is provided, and the crank pin 42 is provided on the slider 41 to connect the crank rod 6. However, the moving and fixing mechanism of the slider 41 becomes complicated, and the diameter of the rotating shaft 11 and the unbalanced mass also increase. .

On the other hand, in the surface treatment apparatus, the reciprocating movement of the work accommodating tool is to change the posture and the gathering state of the work and to make the treatment liquid uniformly contact and flow on the surface of the work having a complicated shape. However, this purpose has hitherto been almost achieved by changing the reciprocating cycle according to the mass and shape of the work, and therefore the necessity of making the reciprocating movement of the container a variable stroke was not so great.

[0006]

However, if a non-volatile solvent such as water is used as the cleaning liquid instead of Freon in order to avoid the occurrence of pollution, it takes time to dry the surface of the work after the work is lifted from the processing liquid. Therefore, there has been a problem that the processing cycle becomes long and the processing cycle becomes long. Therefore, an attempt has been made to reduce the drying time by pulling the work out of the processing liquid and then shaking the work to perform so-called draining.

In order to effectively drain water, it is effective to shake the work abruptly (in a short cycle), but when trying to shake the work abruptly in the air with a conventional surface treatment device, reciprocating motion occurs. Because the stroke was too large, the work was dangerous and the water could not be drained very effectively.

Therefore, according to the present invention, the reciprocating stroke of the work container can be made variable with a relatively simple structure, whereby surface treatment of the work in the processing liquid and removal of the work from the processing liquid are performed. An object of the present invention is to obtain a surface treatment apparatus that can effectively perform both the water draining operation and the short time.

[0009]

A surface treating apparatus according to the present invention is a surface treating apparatus using a reciprocating crank mechanism 10 as a reciprocating mechanism of a container 1 for a work, and a rotary shaft 11 of the reciprocating crank mechanism 10. Lever lever 12 at the eccentric position
Is rotatably inserted, the phase changing means 22 for rotating the lever shaft relative to the rotating shaft 11 is provided, and the crank 7 of the reciprocating crank mechanism 10 is provided at the shaft end of the lever shaft 12, thereby accommodating The above-mentioned problem is solved by making the reciprocating stroke of the tool 1 variable. Rotating shaft 11 and lever shaft 12
Is a conical fitting portion 14 or 1 near the mounting portion of the crank 7.
By providing 5, it is possible to fit without rattling.

[0010]

The crank 7 of the reciprocating crank mechanism is the rotary shaft 1
Since it rotates about the axis of 1, the phase changing means 22
And the phase of the lever shaft 12 with respect to the rotation shaft 11 (angle direction)
By changing, the reciprocating stroke of the container 1 that reciprocates via the crank rod 6 changes. That is, the stroke becomes maximum when the lever shaft 12 is rotated so that the crank 7 extends in the same direction as the eccentric direction of the lever shaft 12, and the crank 7 moves in the direction opposite to the eccentric direction of the lever shaft 12.
The stroke is minimized when the is turned. If the arm length of the crank 7 (the distance from the center of the lever shaft to the pivot position of the crank rod) is made equal to the eccentric amount of the lever shaft 12 with respect to the rotary shaft 11, the minimum stroke becomes zero (does not reciprocate). , Because it is not necessary to set the stroke to zero,
The difference between the arm length of the crank 7 and the eccentric amount of the lever shaft 12 is determined so as to obtain the required minimum stroke.

In the mounting portion of the crank 7, a radial force acts on the lever shaft 12, and when the work is reciprocated particularly in a short cycle, the radial force becomes extremely large due to inertial force. Rotating shaft 11 without play
In order to be transmitted to the crankshaft 7, the rotary shaft 11 and the lever shaft 12 are fitted to each other via the conical fitting portions 14 and 15 near the mounting position of the crank lever 7. As the conical fitting portions 14 and 15, tapered roller bearings having a large radial pressure resistance can be used.

In order to efficiently perform the surface treatment of the work in the treatment liquid and the draining of the work after being pulled up from the treatment liquid by the apparatus of the present invention, the surface treatment is performed with a long cycle and a large stroke, and the draining is performed with a short cycle. Use a small stroke. The relationship between the length of the cycle and the magnitude of the stroke referred to here is relative. The cycle and stroke set for each operation are set according to the shape and mass of the work, the type of processing, and the like.

The variable stroke structure of the present invention can be used in place of the variable period structure of the conventional device. In this case, the drive motor of the rotary shaft 11 does not have to be the variable speed motor.

[0014]

1 to 4 show an embodiment of the present invention. A storage basket 1 for storing a work is suspended from a lower end of a vertical reciprocating shaft 2, and the reciprocating shaft 2 is axially movably and rotatably supported by a lifting frame 5 by bearings 3 and 4. ing. The reciprocating shaft 2 is suspended by a crank rod 6 having spherical joints at both ends, and the upper end of the crank rod 6 is connected to a crank lever 7.

The base end of the crank lever 7 is fixed to the tip of a lever shaft 12 which axially penetrates the eccentric position of a rotary shaft 11 which is horizontally supported by the lifting frame 5 by bearings 8 and 9. The length L of the crank lever 7 is slightly smaller than the eccentric amount D of the lever shaft 12. When it is desired to increase the reciprocating stroke of the storage basket 1 without increasing the diameter of the rotating shaft 11, the length L of the crank lever is set larger than the eccentricity D.

A front opening taper hole 14 is formed at the tip of the through hole 13 for inserting the lever shaft 12 provided in the rotary shaft 11 (on the crank lever 7 side), and the taper hole 14 is also formed at the tip of the lever shaft 12. A corresponding tapered portion 15 is formed. A gear 16 is fixed to the base end of the lever shaft 12 (opposite the crank lever 7 side), and a compression coil spring 18 is interposed between the gear 16 and the base end of the rotary shaft 11 via a thrust bearing washer 17. There is. The compression coil spring 18 gives an axial force to the lever shaft 12 toward the base end side, and the tapered hole 14 and the tapered portion 15 are fitted together by this axial force without a gap.

A motor bracket 2 is attached to the base end of the rotary shaft 11.
1 is fixed, and a gear 2 fixed to the output shaft of a brake motor 22 with a reducer mounted on the motor bracket 21.
Reference numeral 3 meshes with a gear 16 fixed to the lever shaft 12.
The brake motor 22 with a reducer has a torque sufficient to rotate the lever shaft 12 against the fitting load between the tapered hole 14 and the tapered portion 15, and the brake shaft 22 of the lever shaft 12 is stopped during stop. A brake is incorporated to prevent the rotation in cooperation with the fitting load between the tapered hole 14 and the tapered portion 15. Since the brake motor 22 main body rotates together with the rotary shaft 11, electricity is supplied through the slip ring 24 provided on the rotary shaft 11.

A large-diameter pulley 25 is fixed to the rotating shaft 11, and the inverter motor 2 mounted on the lifting frame 5 is mounted on the rotating shaft 11.
A small-diameter pulley 27 fixed to the output shaft 6 and a belt 28 are connected. The number of revolutions of the inverter motor 26 changes by changing the frequency of supplied electricity with an inverter provided in its drive electric circuit.

The elevating frame 5 is guided by a guide column 29 to be movable up and down, and is connected by a crank rod 33 to an eccentric position of a wheel gear 32 which is rotationally driven by meshing with a pinion 31 fixed to an output shaft of an elevating motor 30. And moves up and down according to the rotation of the wheel gear 32. The housing basket 1 is moved up and down by the elevating operation of the elevating frame 5, is immersed in the processing liquid in a processing tank (not shown), and is pulled up from the processing liquid.

A semi-cylindrical guide tube 35 is fixed to the front surface of the elevating frame 5, and a tip of a roller pin 37 is erected in a spiral groove 36 provided in the guide tube 35 in a direction perpendicular to the reciprocating shaft 2. The cam follower 38 is movably fitted. The spiral groove 36 reciprocally rotates the reciprocating shaft 2 (and thus the storage basket 1) as the reciprocating shaft 2 reciprocates up and down.

Next, the operation in the case of performing the reciprocating movement of the storage basket 1 in the processing liquid and the draining operation after the container is pulled up from the processing liquid in the illustrated apparatus will be described. First, the brake motor 22 is driven to rotate the crank lever 7 in the direction in which the stroke increases, and the lever angle is set so as to obtain the desired stroke S during the surface treatment (FIG. 3). Next, the elevating frame 5 is lowered to immerse the storage basket 1 in a treatment liquid (not shown). Next, the inverter motor 26 is rotated at a desired speed to reciprocate the work stored in the storage basket 1 in the processing liquid. In the apparatus shown in the figure, the storage basket 1 is given a motion that combines reciprocating up and down movements and reciprocating rotation synchronized therewith. The reciprocating lifting stroke at this time is held at the set stroke S by holding the direction of the crank lever 7 by the fitting load between the tapered hole 14 and the tapered portion 15 and the braking force of the brake motor 22. The cycle is set by the number of revolutions of the inverter motor 26. This stroke and cycle can be changed even during processing.

When the treatment in the treatment liquid is completed, the rotating shaft 11
Is temporarily stopped, and the elevating frame 5 is raised to pull up the work from the processing liquid. During this pulling up operation, the brake motor 22 is rotated, the crank lever 7 is rotated toward the short stroke side (FIG. 4), and the rotation speed setting of the inverter motor 26 is switched to the high speed side. Then, after the work is lifted from the processing liquid, the inverter motor 26 is rotated to give the storage basket 1 a short cycle T and a short period of vibration, and the excess processing liquid adhering to the work and the storage basket 1 is removed. Then, the storage basket 1 is replaced or the storage basket 1 is turned over to transfer the processed work to the dryer, and the same processing is performed on the new work.

[0023]

According to the present invention described above, it is possible to obtain a surface treating apparatus having a simple structure capable of arbitrarily changing the stroke of the reciprocating motion given to the workpiece accommodated in the container of the surface treating apparatus. . Then, by setting the reciprocating stroke given to the work during surface treatment in the treatment liquid and the reciprocating stroke given to the work when draining the work after lifting it from the treatment liquid to the optimum strokes, the treatment including drying The effect is that the whole process can be performed efficiently.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a main part of an apparatus according to an embodiment.

FIG. 2 is a perspective view of a mechanical portion of the embodiment apparatus.

FIG. 3 is an explanatory diagram of a state where the stroke is increased.

FIG. 4 is an explanatory diagram of a state where the stroke is reduced.

FIG. 5 is an explanatory diagram showing an example of a known variable stroke mechanism.

[Explanation of symbols]

 1 Storage basket 6 Crank rod 7 Crank lever 11 Rotating shaft 12 Lever shaft 14 Tapered hole 15 Tapered part 22 Brake motor

Claims (2)

[Claims] 1. A surface treatment apparatus for treating the surface of a work by immersing a container (1) containing a work in a treatment liquid and reciprocatingly driving the reciprocating crank mechanism (10). A lever shaft (12) is rotatably inserted in an eccentric position of the rotary shaft (11) of the mechanism, and phase changing means (22) for rotating the lever shaft relative to the rotary shaft (11) is provided. Equipped with a reciprocating crank mechanism crank
(7) is provided at the shaft end of the lever shaft (12), the surface treatment apparatus having a variable stroke mechanism. 2. The rotating shaft (11) and the lever shaft (12) are cranks.
The surface treatment apparatus according to claim 1, further comprising conical fitting portions (14) and (15) near the mounting portion of (7).