JPS6354501B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a piston ring abnormal state detection device in an automatic assembly machine for automobile engine pistons, etc.

Conventionally, as this type of device, for example, Japanese Patent Application Laid-open No. 55
-There is one described in Publication No. 11772. This involves fitting the rings one by one into each ring groove of the piston, and simultaneously confirming the fitting using five sensing actuators. However, although this allows confirmation of fitting, it is not suitable for detecting damage, and is also structurally complex.

Although the present invention takes these problems into account, it is an object of the present invention to provide a device that can not only simply confirm fitting but also detect damage, has a simple mechanism, and is reliable in operation.

The present invention will be described below with reference to embodiments shown in the drawings. Reference numeral 1 denotes a base, and a column 2 is provided on this base. Reference numeral 3 denotes a support shaft supported by a base, and a support base 4 is provided at the upper end of the support shaft 3, so that the support base 4 supports the piston P to which each ring has been previously attached in a previous step. Reference numeral 5 denotes a drive motor for rotating the drum cam 6, which constitutes a drive section of each mechanism described later. Lever 7 is attached to drum cam 6
are engaged and connected via links 8 and 9 to a swing rod 10. The rack of the rack rod 10 meshes with a gear 3a formed at the lower part of the support shaft 3, so that the support shaft 3 rotates around the shaft as the drum cam 6 rotates. Further, a lever 11 is engaged with the drum cam 6, and as the drum cam 6 rotates, the rod 12 is moved up and down, the vertical movement arm 12a is swung, and the engagement of the tip of the vertical movement arm 12a causes the support shaft to be
It is configured to move up and down. Bearing shaft 3
is initially located at the bottom, and when the piston P conveyed from the previous process is received on the support stand 4, the motor 5 is started and the piston P is moved to the stopper 13.
lift it until it hits the 14a, when the support shaft 3 rises, if some obstacle prevents the rise and an abnormal force is applied, the internal spring is compressed and the dog 14b, which is integrally provided with the shaft 12, rises. Always ON in the direction away from the switch
This is a limit switch of the safety device 14 that turns the state of

On the other hand, ring damage detection rods 15A, 15 are arranged radially toward the ring grooves Pa, Pb, and Pc of the piston P.
B and 15C are arranged horizontally. At the tips of these detection rods 15A, 15B, and 15C, circular detectors 15a, 15b, and 15c, which are slightly thinner than the ring grooves Pa, Pb, and Pc, are attached. Also, detection rods 15A, 15B, 15C
are integrated by a common block 16, and the column 2 and the guide block 17 fixed thereto.
The piston moves forward and backward with respect to the piston P while being guided by the piston P. This forward and backward movement is performed by the cam follower 16a of the common block 16.
This is done by the engagement of the drum cam 6 with the drum cam 6. That is, during normal times, the detection rod 15 shown in FIG.
A, 15B, 15C are detection rods 15A, 15
Flanges F ₁ , F ₂ provided at the rear end of B, 15C,
The levers L ₁ , L ₂ , and L ₃ , which are engaged with F ₃ via pins P ₁ , P ₂ , and P _{3 ,} are pivoted clockwise to the retracted position. Now when the piston P is in the receiving state,
The guide bars 18a, 18b are rotated by the rotation of the drum cam 6.
The common block 16, which is guided vertically, is lowered. By lowering this common block 16, the lever
When L ₁ , L ₂ , L ₃ swing counterclockwise around the support axis L _p , flanges F ₁ , F ₂ , F ₃ and pins P ₁ , P ₂ , P ₃
The engagement of the rods 15A, 15B, and 15C is released, and the spring force of the spring 19 moves each rod 15A, 15B, and 15C forward. 19 is the aforementioned biasing spring, and 20 is a limit switch for detecting an abnormal state of the rod.

Further, a lever 21 is engaged with the drum cam 6 via a cam follower 16a.
The two swinging operation rods 22 and 23 are operated by the engagement between the cam and the drum cam 6. Reference numerals 24 and 24' designate rocking shafts supported by bearings 25 and 26 of the column 2, around which cup-shaped cams 27 and 27' are fitted (see FIG. 2). These cams 27, 27' are integrated with the operating rods 23, 23. Swing shaft 24, 2
Fitting confirmation detectors 28, 28' are fixed to the lower end of the piston P, and have oil cutting ring abutments 28a, 28'a provided above and below with a combined ring in the groove at the lowest stage of the piston P. ing. That is, as shown in FIGS. 5 and 6, the piston rings fitted into the ring grooves Pa and Pb of the piston P
Breakage and fitting detection of R ₁ , R ₂ and the combined ring R ₄ fitted into the lowest groove Pc is detected by pressing each detection rod 15a, 15b, 15c.

Further, the presence or absence of the oil drain rings R ₃ and R ₅ provided above and below the combined ring, which are fitted together with the combined ring R ₄ into the lowermost groove Pc of the piston P, is detected by fitting confirmation detectors 28 and 28'.

Next, the details of one of the fitting confirmation detection parts having the same configuration will be explained with reference mainly to FIG. 30 are provided. Further, a torsion spring 31 is provided between the lower end of the cam 27 and the flange 29. Further, a pin 32 is fixed orthogonally to the swing shaft 24, and this pin 32 engages with a cam groove 33 having a lead formed in the cam 27. Furthermore, as shown in FIG. 1, a limit switch 34 is provided at the upper end of the swing shaft 24. The operation of this mechanism will be explained in detail in the operation description section below.

In the device configured in this way, the piston P to which each piston cylinder is assembled in the previous process is
is installed on the support stand 4, the motor 5 starts,
The drum cam 6 rotates, and the support base 4 rises together with the support shaft 3. The piston P rises and reaches the stopper 13.
When it hits the detection rods 15A, 15B, 15
Detectors 15a, 15b, 15c of C are piston P
move forward towards. Further, the confirmation detectors 28, 28' are applied to the oil drain ring from both sides via the operating rods 22, 23, so that the combined ring fitted in the groove Pc at the lowermost stage of the piston P is applied.

When these detectors 15a, 15b, 15c and detectors 28, 28' are in contact with the ring of the piston P, the piston P is rotated 360 degrees together with the support shaft 3 via the rack rod 10 by the cam action of the drum cam 6. Rotate. If the rings R ₁ , R ₂ , R ₄ are damaged or come off, the detectors 15a,
15b and 15c enter the piston P side by a predetermined length or more (see FIG. 5). This abnormal intrusion is detected by the limit switch 20, and a display means such as a buzzer indicates that there is an abnormal state.

On the other hand, the operation for confirming that the lowest oil cutting ring is fitted will be explained. That is, the swing shaft 24 is urged counterclockwise by the torsion spring 31 engaged with the cam 27, as shown in FIG. 8, and as a result, the pin 3 integrated with the swing shaft 24
2 is engaged with one circumferential end surface 33a of the cam groove 33. At this time, since the rod 22 had not been operated yet, the contact 2 of the fitting confirmation detector 28
8a is in a state separated from the surface of the piston P.
Next, when the drum cam 6 rotates and the operating rod 22 is retracted, the abutment 28a of the detector 28 integrated with the drum cam ₆ rotates, and as shown in FIG. contact with the part. When the detector 28 comes into contact, the cam groove 33 rotates counterclockwise as the rod 22 is retracted, so that the amount of twist of the torsion spring 31 decreases. Once the detector 28 hits the outer diameter of the combined ring, the pressing force against the one end surface 33a of the torsion spring 31 suddenly decreases. When the operating rod 22 is further retracted and the lever of this rod 22 is rotated, the detector 28 does not rotate due to contact with the combined ring, but only the cup-shaped cam 27 rotates counterclockwise. Therefore, one end surface 3 of the cam groove
3a moves away from pin 32 and conversely moves away from pin 3
2 begins to rise to the deepest part along the lead of the cam groove 33. That is, the detector 2 together with the swing shaft 24
8 tries to rise. At this time, if the bottom groove
If there is no piston rail on the combined ring in Pc, the pin 32 will reach the deepest part of the lead, and the swing shaft 24 will rise by more than the set length.
At this time, the limit switch 34 is activated and it is displayed that there is no upper piston rail. Further, when the piston rail is present, the deepest part is not reached and the position indicated by reference numeral 32' is reached, so the limit switch 34 does not operate and a message indicating that it is normal is displayed.

In addition, the fitting confirmation detector 2 provided on the opposite side
8' is fitted in the same manner, but in this case, since the detector 28' is installed symmetrically across the piston, simply moving the detector 28' from the top to the bottom causes the lower part of the combined ring to be confirmed. The presence or absence of the rail is checked.

As described above, in the present invention, the ring breakage detector is urged into contact with, for example, three ring grooves,
In addition, since the piston is rotated by the piston support, damage to the piston ring and fitting can be detected. Also, especially for oil cutting ring grooves,
Since the upper and lower fitting confirmation detectors are provided and moved up and down while making contact with each other, the fitting confirmation can be reliably achieved.

[Brief explanation of the drawing]

Fig. 1 is a partially sectional front view of the device of the present invention, Fig. 2 is a plan view thereof, Fig. 3 is an enlarged plan view of the main part, and Fig. 4 is a front view showing the relationship between the detector and the ring groove of the piston. , Figure 5 is a partially enlarged view of the piston ring section,
Fig. 6 is a partially enlarged view of the piston ring section, Fig. 7 is a sectional view showing the fitting confirmation mechanism in the oil cutting ring groove, and Figs. 8, 9, and 10 are horizontal views showing the relationship between the cam and the pin. Cross-sectional view, Figure 11, Figure 12
13 are explanatory diagrams of main parts showing the movement of the corresponding pins along the leads of the cam grooves. P...Piston, Pa, Pb, Pc...Ring groove,
3...Bearing shaft, 5...Drive motor, 6...Drum cam, 10...Swivel rod, 12a...
Vertical movement arm, 15a, 15b, 15c...damage detector, 22, 23...swing operation rod, 24,
24'... Swing shaft, 28, 28'... Fitting confirmation detector, 32... Pin, 33... Cam groove.

Claims (1)

[Scope of Claims] 1. A piston in which a ring is preassembled in each ring groove, a piston support that supports this piston, and a linear movement of this piston support along the arrangement direction of each ring groove of the piston. a drive unit on a fixed base that rotates the piston along the circumference of the groove; The combined ring is sandwiched between the rings fitted into the ring grooves of the piston in conjunction with the linear movement of the support body along the direction in which each ring groove is arranged, and a fitting confirmation detector that comes into contact with a narrow oil cutter ring provided in contact with both ends of the groove; a fitting confirmation detector that is connected between the ring breakage detector and the drive section; and a connection between the fitting confirmation detector and the drive section. An abnormal state detection device for a piston ring, comprising an interlocking mechanism that is provided and operates in synchronization with the linear movement of the support body along the direction in which each ring groove is arranged.