JP3553227B2 - Hydraulic tester - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a hydraulic tester for a hydraulic machine.
[0002]
[Prior art]
Hydraulic testers for construction machinery, called hydraulic universal testers, are used in repair shops, etc., and measure the characteristics of hydraulic equipment such as hydraulic pumps, hydraulic motors, hydraulic valves, etc. after repair and regeneration. The same mechanism is provided to apply the same load to the hydraulic equipment as is actually operating.
[0003]
[Problems to be solved by the invention]
Conventionally, hydraulic testers are conventionally 100 to 200 horsepower, and in the hydraulic test of large construction machinery exceeding its capacity, it is necessary to replace the hydraulic tester with another large horsepower and perform the test, which is extremely uneconomical, It was troublesome.
[0004]
SUMMARY OF THE INVENTION An object of the present invention is to provide a hydraulic tester which can solve the disadvantages of the conventional example described above, can double the power of an existing hydraulic tester simply and inexpensively, and can keep running costs low.
[0005]
[Means for Solving the Problems]
In order to achieve the above object, the present invention firstly connects a hydraulic circuit of a power-up kit having an electric motor and a high-pressure variable displacement pump to a hydraulic circuit of an existing hydraulic tester as necessary, and adjusts a high-pressure variable of the power-up kit. The displacement pump is of a higher pressure than the existing hydraulic tester's high-pressure variable displacement pump, and the oil discharged from the high-pressure variable displacement pump of the power-up kit is transferred to the existing hydraulic tester system line and be used as an aid, the second, power-up kit direction switch for switching whether sending the oil to discharge from the discharge port to the system line of the existing hydraulic tester, and discharges the high-pressure oil from the flow-out port of the single use The gist is to incorporate a valve.
[0006]
According to the first aspect of the present invention, the power of the existing hydraulic tester can be doubled by a simple and quick operation simply by attaching a power-up kit to the existing hydraulic tester. Because it can be used as it is, its performance can be obtained at a low price that is incomparable with large existing hydraulic testers.
[0007]
In addition, when high output is not required, the existing hydraulic tester or power-up kit can be operated independently, which can extend the life of the existing hydraulic tester and the hydraulic pump of the existing hydraulic tester body Operation during disassembly and repair of the vehicle is also possible.
[0008]
Running cost can be greatly reduced compared to moving a large motor by itself due to reduction of operating current, independent operation, etc.
[0009]
According to the second aspect of the present invention, the high-pressure variable displacement pump of the power-up kit has a higher pressure than the high-pressure variable displacement pump of the existing hydraulic tester and switches the direction switching valve. Thus, the oil discharged from the discharge port of the power-up kit can be discharged as high-pressure oil from the flow-out port used alone to obtain a pressure that cannot be obtained with an existing hydraulic tester.
[0010]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a front view showing an embodiment of the hydraulic tester of the present invention, FIG. 2 is a rear view of the same, FIG. 3 is a side view of the same, and FIG. 7 is a hydraulic circuit diagram.
[0011]
In the figure, 1 is an existing hydraulic tester, 2 is a power-up kit for connecting to the existing hydraulic tester 1 as necessary, 3 is a hydraulic hose for making this connection, and the existing hydraulic tester 1 is a well-known oil tank. 4, a main motor 5, a high-pressure variable displacement pump 6 driven by the main motor 5, various valves, an auxiliary pump, and the like. For example, the high-pressure variable displacement pump 6 has a discharge pressure of 350 kg / cm ^{2 at} the maximum.
[0012]
Further, the existing hydraulic tester 1 incorporates a high-torque motor unit 13 and a power-up cylinder 14, which are composed of a high-torque motor, a connection flange, a universal joint, an adapter plate, and the like. These high-torque motor unit 13 and power-up cylinder 14 are connected and connected to a hydraulic pump, a hydraulic motor, and the like, which are the test objects, and apply a load for testing to these.
[0013]
On the other hand, the power-up kit 2 comprises an electric motor 7, a high-pressure variable displacement pump 8, a suction filter 9, a control panel 10, etc., and connects the hydraulic circuit to a hydraulic circuit of an existing hydraulic tester via a directional switching valve 11. Is done. The high-pressure variable displacement pump 8 has a discharge pressure of, for example, a maximum of 420 kg / cm ² .
[0014]
In the figure, reference numeral 12 denotes a check valve unit provided on the hydraulic circuit side of the existing hydraulic tester 1. When the power-up kit 2 is connected to the existing hydraulic tester 1, the check valve unit is connected thereto. Of the oil discharged from the hydraulic tester 1 and the power-up kit 2 is prevented.
[0015]
Further, the suction line of the high-pressure variable displacement pump 8 of the power-up kit 2 is connected to the oil tank 4 of the existing hydraulic tester 1, whereby the existing hydraulic pressure is transmitted through the high-pressure variable displacement pump 8 and the direction switching valve 11. A circuit connected to the check valve unit 12 of the tester 1 is formed. This circuit is a closed circuit including the oil tank 4 of the existing hydraulic tester 1, the high-pressure variable displacement pump 6, the high-torque motor unit 13 and the oil tank 4. (Closed type).
[0016]
In this manner, the power-up kit 2 discharges the oil sucked from the suction line of the high-pressure variable displacement pump 8 from the discharge port, and transfers the oil into the system line of the existing hydraulic tester 2 to assist the existing hydraulic tester 2. Will be used.
[0017]
Further, when the discharge oil from the power-up kit 2 is used as an auxiliary for the drive motor line of the existing hydraulic tester 1 in the hydraulic circuit of the existing hydraulic tester 1, this auxiliary oil returns to the oil tank 4. A low-pressure relief valve unit 15 used for adjustment was provided.
[0018]
The switching direction of the directional switching valve 11 of the power-up kit 2 which is not on the check valve unit 12 side of the existing hydraulic tester 1 is constituted by a hydraulic gauge, a flow-out port, and a flow meter turbine block for measurement. A high-pressure oil measuring unit 16 for measuring the pressure and discharge amount of the flow out line of the kit 2 is connected.
[0019]
In the drawing, reference numeral 18 denotes a high-pressure load valve unit, which is connected to the discharge side of the high-pressure variable displacement pump 8 and applies a load by increasing the pressure to 0 to 420 kg / cm ² .
[0020]
In the figure, reference numeral 17 denotes a hydraulic remote controller provided in the flow out line of the power-up kit 2, which comprises a high pressure relief valve and a low pressure relief valve, and controls the pressure and power of the flow out line. The discharge amount of the high-pressure variable displacement pump 8 of the up kit 2 and the rotation of the drive motor are remotely controlled.
[0021]
An electric remote controller 19 in FIG. 1 includes an ammeter, various switches, a lamp, a flow meter, and the like, and remotely controls the control panel 10 of the power-up kit 2.
[0022]
Next, the usage will be described. The hydraulic oil sent from the high-pressure variable displacement pump 8 of the power-up kit 2 powers up the hydraulic system of the existing hydraulic tester 1 by the directional switching valve 11 or uses the additional high-pressure discharge port. Selects whether to discharge high-pressure hydraulic oil up to 420 kg / cm ² .
[0023]
As a convenience, the addition of the power-up kit 2 can increase the hydraulic horsepower of the existing hydraulic tester 1 by almost 100 to 150 horsepower. When such a high pressure is not required, the existing hydraulic tester 1 can be used. 1 or the power-up kit 2 can be used alone.
[0024]
FIG. 8 is a graph showing the relationship between the discharge pressure and the flow rate. A indicates the case where the conventional or existing hydraulic tester 1 is used alone, B indicates the case where the power-up kit 2 is used alone, and C indicates the case where the power-up kit 2 is added. This is the case where the hydraulic tester 1 that has been powered up is used.
[0025]
FIG. 9 is a comparison of torque curves of drive motors. A shows the case where the conventional product or the existing hydraulic tester 1 is used alone, and C shows the case where the hydraulic tester 1 powered up by adding the power-up kit 2 is used. It is. By adding the power-up kit 2 in this manner, a drop in torque in a high rotation range, which can be regarded as a fate of the hydraulic transmission, is significantly reduced.
[0026]
FIG. 10 shows another embodiment in which the hydraulic circuit of the existing hydraulic tester 1 is an open circuit, and includes an oil tank 4, a main motor 5, a high-pressure variable displacement pump 6 driven by the main motor 5, various valves and the like. The power-up kit 2 includes an auxiliary pump and the like, and the high-pressure variable displacement pump 8 driven by the electric motor 7 is connected to the high-pressure variable displacement pump 6 in series.
[0027]
As described above, in the case of the existing hydraulic tester 1 having an open circuit, the power-up kit 2 can be added relatively easily, and an adjustment function such as the low-pressure relief valve unit 15 is not required.
[0028]
【The invention's effect】
As described above, the hydraulic tester of the present invention can easily and inexpensively double the power of an existing hydraulic tester without replacing it with another hydraulic tester having a large horsepower so as to support a hydraulic test of a large construction machine. And the running cost can be kept low.
[Brief description of the drawings]
FIG. 1 is a front view showing one embodiment of a hydraulic tester of the present invention.
FIG. 2 is a rear view showing one embodiment of the hydraulic tester of the present invention.
FIG. 3 is a side view showing one embodiment of the hydraulic tester of the present invention.
FIG. 4 is a front view of a power-up kit part.
FIG. 5 is a side view of a power-up kit part.
FIG. 6 is a plan view of a power-up kit part.
FIG. 7 is a hydraulic circuit diagram.
FIG. 8 is a graph showing a relationship between a discharge pressure and a flow rate.
FIG. 9 is a comparison of torque curves of a drive motor.
FIG. 10 is a circuit diagram showing one embodiment of a hydraulic tester of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Hydraulic tester 2 ... Power up kit 3 ... Hydraulic hose 4 ... Oil tank 5 ... Main motor 6 ... High pressure variable capacity pump 7 ... Electric motor 8 ... High pressure variable capacity pump 9 ... Suction filter 10 ... Control panel
11 ... Direction switching valve 12 ... Check valve unit
13 ... High torque motor unit 14 ... Power up cylinder
15… Low pressure relief valve unit
16… High pressure oil measurement unit
17… Hydraulic remote controller
18… High pressure load valve unit
19… Electric remote controller

Claims (2)

Connect the hydraulic circuit of the power-up kit with electric motor and high-pressure variable displacement pump to the hydraulic circuit of the existing hydraulic tester as necessary.The high-pressure variable displacement pump of the power-up kit is higher than the high-pressure variable displacement pump of the existing hydraulic tester. A hydraulic tester characterized in that it is a pressure type, and the oil discharged from the high pressure variable displacement pump of the power-up kit is transferred to the existing hydraulic tester system line and used as an auxiliary to the existing hydraulic tester. Power up or kit sends oil to discharge from the discharge port to the system line of the existing hydraulic tester according to claim 1, wherein those incorporating a direction switching valve for switching whether to discharge a high-pressure oil from the flow-out port of the single use Hydraulic tester.

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