JPH0221534B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a damping force testing device for a shock absorber, and more particularly to a damping force testing device for a shock absorber that can automatically and continuously perform damping force tests.

Conventionally, damping of a shock absorber has a displacement generating mechanism that provides a relative displacement between the piston and shell of the shock absorber, and a damping force detection means that detects the damping force of the shock absorber displaced by the displacement generating mechanism together with the displacement. Test equipment is well known.

However, conventional apparatuses generally have a so-called stationary type construction in which the piston and shell of the shock absorber are individually held and fixed by chucks for testing.

For this reason, with conventional test equipment, it is necessary to manually attach and detach the shock absorber to be tested, which increases the number of man-hours, reduces work efficiency, and requires a test process that is independent from the shock absorber assembly line. This became necessary and became an impediment to efforts to shorten the manufacturing process.

The present invention has been developed in view of the above circumstances, and it is possible to automatically and continuously test the damping force of a shock absorber, thereby saving labor and improving efficiency. The object of the present invention is to provide a shock absorber damping force test device that can greatly contribute to consolidation and shortening.

Therefore, the present invention includes a transfer means that transfers the shock absorber at predetermined intervals, and a synchronizer that moves in synchronization with the shock absorber transferred by the transfer means for a certain distance, and then moves backward to the initial position after moving the shock absorber for a certain distance. , a fixing means for fixing one end of the shock absorber on the transfer means during synchronous movement of the synchronizer; a gripping means on the synchronizer for gripping the other end of the shock absorber during synchronous movement; The shock absorber is characterized by comprising a displacement applying means for relatively displacing the shock absorber by a constant stroke in the direction of expansion and contraction, and a damping force detecting means for detecting the damping force of the shock absorber corresponding to the displacement applied by the displacement applying means.

When the shock absorber is placed in an upright position at a predetermined receiving position of the transfer means, one end of the shock absorber is fixed on the transfer means by the fixing means, and at the same time the other end of the shock absorber is held by the gripping means. The absorber is automatically held in a test state. Thereafter, the shock absorber is relatively displaced by a fixed stroke in the direction of expansion and contraction by the displacement applying means, and the damping force at that time is detected by the damping force detecting means to perform a test. At the end of the test, the gripping means and the fixing means are again automatically separated from both ends of the shock absorber, and the shock absorber is now free to be removed. After the synchronizer moves for a certain distance while testing the shock absorber in this way, the synchronizer is returned to its initial position and waits for the next shock absorber to be received.

Hereinafter, one embodiment of the present invention will be described with reference to the drawings.

First, the work transfer means will be explained. A fixed base 1 having a horizontal bed surface 1A on its upper end surface is provided in the shape of a track, for example. A pallet guide 2 is erected on the base 1, and a belt 3 is rotated continuously and at a constant speed by a motor 4 along the pallet guide 2.
A workpiece pedestal 5 having an approximately L-shaped side surface and a pallet 6 supporting it are connected to this belt 3 via a bracket 7, and the pallet 6 is continuously transferred by sliding on the base 1. . The shock absorber 13 is placed on the workpiece pedestal 5 in an upright position and the shell 13B is placed on the lower side, so that the workpiece is continuously conveyed. and,
A synchronizer 8 is attached to the base 1 at a predetermined position, for example, approximately at the center of the linear portion. This synchronizer 8
is a moving platform 1 that moves guided by a horizontal bar guide 9 installed on a base 1 in parallel with a belt 3.
0 and a synchronizing means provided on the side surface of the moving table 10, for example, a stopper control cylinder 12 having a piston rod 11 as a pallet synchronizing stopper whose tip end can come into contact with the front surface of the pallet 6 in the advancing direction. . The synchronizer 8 also includes a shock absorber 13 placed on the workpiece pedestal 5.
, that is, the tip flange portion 1 of the shell 13B.
Cylinder 1 for clamping the lower part of the workpiece with a presser lever 14 as a fixing means for pressing and fixing 3C downward.
5. The presser lever 14 of the workpiece lower clamp cylinder 15 is provided with a protrusion and downward rotational driving force by a cam device (not shown). The movable table 10 is configured to be able to push back the belt 3 by a fixed stroke in a direction opposite to the traveling direction of the belt 3 by means of a push-back cylinder (not shown).

Therefore, the synchronization operation is performed as follows. That is, the shock absorber 13 as a workpiece is placed on the workpiece pedestal 5 at a predetermined receiving position (the point indicated by A in FIG. 2) and is transferred in the direction of the synchronizer 8 (in the direction of arrow a in FIG. 2). Then, the shock absorber, that is, the workpiece is detected by the workpiece detector 16 provided in the front position of the synchronizer 8. The synchronizer 8, which had been previously placed at the initial position (the position shown in FIG. 2) by the push-back cylinder,
The pallet synchronization stopper 11 is projected and brought into contact with the front surface of the pallet 6 in the advancing direction, thereby starting synchronous movement. Further, the lower end of the shock absorber 13 is fixed by the projection and downward rotation of the presser lever 14 due to the operation of the workpiece lower clamping cylinder 15. And a constant stroke,
After the synchronizer 8 moves, the stopper control cylinder 12 and the workpiece lower clamp cylinder 1
5 moves back, drives the piston rod 11 and presser lever 14 in the retracting direction, and moves the shock absorber 13 again in a free state onto the workpiece pedestal 5. For example, at the workpiece take-out point B in FIG. It should be in a state where it can be taken out.

Next, a displacement applying means for gripping the shock absorber and applying a relative displacement, and a damping force detecting means for detecting the damping force will be explained. A main body frame 17 as a damping force test mechanism is installed integrally on the synchronizer 8. A cylinder 18 is attached downward to the upper end of this main body frame 17,
This cylinder 18 is provided with a slide base 19 that can move up and down with a constant stroke. A crank mechanism 21 is attached to one side of the slide base 19 via a bracket 20. This crank mechanism 21 is connected via a universal joint 22 to a drive motor 23 on the main body frame 17 via pulleys 24, 25 and a belt 26. Crank shaft 27 of this crank mechanism 21
A crank arm 28 is vertically connected to the crank arm 28, and a chuck cylinder 29 is connected to the lower end of the crank arm 28.
The chuck pawl 30 is attached via. This chuck pawl 30 is designed to contract when it is lowered by a certain stroke so that it can automatically grip the upper end of the shock absorber, that is, the piston 13A, and together with the chuck cylinder 29, constitutes the gripping means of the present invention. . This crank mechanism 21
A load cell 31 as a load detector and a rotary encoder 32 as a displacement (angle) detector
is installed. That is, the load cell 31 is installed between the crank arm 28 and the chuck cylinder 29, and the rotary encoder 32
is attached to the tip of the crankshaft 27. That is, the crank mechanism 21 constitutes a displacement applying and load generating means, and each detector is provided integrally therewith. Although not shown, an output section such as a damping force display device is disposed within the main body frame 17.

Therefore, when the main body frame 17 is moved in synchronization with the shock absorber 13 by the synchronizer 8 as described above, the slide base 19 is first lowered by the driving force from the cylinder 18 of the slide base 19. Shock absorber 13
The upper end, ie, the tip of the piston, is gripped via the chuck pawl 30 by the downward movement of the chuck cylinder 29. After the gripping, the slide base 19
rises again, and once it reaches the test position where the crankshaft 27 is horizontal, it stops. and,
After the slide base rises to the damping force test position and stops, the drive motor 23 operates, and the crankshaft 27 rotates once through the universal joint 22 during the period of synchronous movement of the synchronizer 8. This one rotation is detected by a rotary encoder 32 which is a displacement detector, and a constant damping force load is detected by a load cell 31 which is a load detector. Then, the detected value is displayed on a display device (not shown) to detect the load.

The operation of this synchronization and damping force test will be explained using diagrams. That is, from the top of FIG. 3, the chuck state by the chuck pawl 30, the raising and lowering of the slide base 19, the rotation and stopping of the drive motor 23, the workpiece detection by the workpiece detector 16 and the determination of the damping force (OFF, ON), 1 for inserting and extracting the piston rod 11 as a stopper, clamping and unclamping the presser lever 14, and advancing and retracting the synchronizer 8.
Indicates cycle operation status.

The effects will be explained below in accordance with the order of operation.

(1) Shock absorber 13 on the workpiece pedestal 5
When this is detected by the workpiece detector 16 shown in FIG. 2, the piston rod 21 protrudes as a stopper and enters the engaged state. Then, after a certain period of time (T) (time until the shock absorber 13 reaches the synchronizer 8), the presser lever 14 presses the lower end of the shock absorber 13 against the workpiece pedestal 5.

(2) As a result, the synchronizer 8 starts moving forward in synchronization with the movement of the pallet 6 due to the abutment of the piston rod 11 against the front surface of the pallet 6.

(3) Next, the slide base 19 is attached to the cylinder 18.
The chuck pawl 30 chucks the upper end of the shock absorber 13 by the action of the chuck cylinder 29. Thereafter, the slide base 19 rises to the test position.

(4) Thereafter, the drive motor 23 rotates, and the damping force is measured by an automatic damping force determination device (not shown) to determine whether the measurement is acceptable or not.

(5) After the pass/fail determination, the slide base 19 is lowered and the drive motor 23 is stopped.

(6) Connect the chuck claw 30 to the chuck cylinder 2.
The slide base 19 is raised by the operation 9 to bring it into an anti-yack state, and the slide base 19 is raised.

(7) Along with this, lower clamp cylinder 15
This action causes the presser lever 14 to be pulled out, and the stopper control cylinder 12 to pull out the piston rod 11 as a stopper from the lower end portion of the shock absorber 13.

(8) Finally, the synchronizer 8 is moved back to the initial position (the position shown in FIG. 2) by a cylinder (not shown), and then waits for the arrival of the shock absorber 13 placed on the pallet 6.

According to the device of this embodiment based on such a configuration and operation, the shock absorber 13 is automatically clamped and relatively displaced while being continuously transferred, and the load cell 31 and Since the damping force can be automatically and continuously tested by the rotary encoder 32, unlike the conventional clamping method which is manually operated, it is possible to save labor and improve work efficiency.

In addition, the lower end of the shock absorber 13 is automatically fixed to the workpiece pedestal 5 by the presser lever 14 of the lower clamp cylinder 15, and the load cell 31 and rotary encoder 32 are integrated into the crank mechanism 21. By moving the shock absorber up and down using the slide base 19, the damping force test can be performed in conjunction with the relative displacement movement of the shock absorber 13. Unlike the case where a displacement detector and a load detector are provided separately, the device configuration can be made smaller, and a particularly large setting space is not required.

Since the damping force test can be carried out while automatically and continuously transporting the assembled shock absorber, for example, the test equipment can be used as part of the continuous production process of the shock absorber by connecting it with the assembly transport device in the previous process. As a result, assembly processes can be consolidated and processes can be reduced.

As described in detail in the above embodiments, the present invention is capable of automatically and continuously performing a shock absorber damping force test process, by assembling the shock absorber and carrying out a damping force test by synchronizing with the conveying device. It can greatly contribute to the consolidation of the entire process.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention, in which Fig. 1 is a front view showing the device configuration in detail with a partial cross section, Fig. 2 is a plan view schematically showing the entire device, and Fig. 3 is the operation. FIG. 2 is a diagram for explaining a process. 3... Belt, 5... Work table, 6... Pallet, 8... Synchronizer, 11... Piston rod (stopper), 12... Stopper control cylinder,
13...Shock absorber, 14...Press lever, 15...Cylinder for clamping the lower part of the workpiece, 1
9...Slide base, 21...Crank mechanism,
28... crank arm, 30... chuck claw,
31... Load detector (load cell), 32... Displacement detector (rotary encoder).

Claims (1)

[Scope of Claims] 1. A transport means for transporting the shock absorber at predetermined intervals, and a synchronizer that moves synchronously over a certain distance with the shock absorber transported by the transport means, and after moving over a certain distance, moves backward to the initial position. a fixing means for fixing one end of the shock absorber on the transfer means during synchronous movement of the synchronous apparatus; a gripping means on the synchronous apparatus for gripping the other end of the shock absorber during synchronous movement; A shock absorber damping force test comprising: displacement applying means for relatively displacing the shock absorber by a constant stroke in the direction of expansion and contraction; and damping force detecting means for detecting the damping force of the shock absorber corresponding to the displacement given by the displacement applying means. Device.