阅读说明：本技术 一种伺服液压缸启动压力的测试方法 (Method for testing starting pressure of servo hydraulic cylinder ) 是由 谢海涛 于 2021-08-04 设计创作，主要内容包括：本发明公开了一种伺服液压缸启动压力的测试方法,属于伺服液压缸技术领域,包括泵、伺服电机、单向阀、压力传感器、磁致伸缩位移传感器、伺服缸、电磁球阀和阻尼孔,所述伺服电机位于泵上,所述单向阀与泵的出油端相连接,所述伺服阀的进油口与泵的出油端相连接,所述泵的出油端上设有旁路,所述压力传感器、电磁球阀和阻尼孔泵均设置在泵的出油端的旁路上,所述电磁球阀与伺服阀压力传感器相连通,所述阻尼孔与电磁球阀相连接。本发明采用了一种简单有效的,可得到连续可调系统压力的方法从而准确测得伺服缸启动压力；具有通用性广,成本低,测试简单的特点。(The invention discloses a method for testing starting pressure of a servo hydraulic cylinder, which belongs to the technical field of servo hydraulic cylinders and comprises a pump, a servo motor, a one-way valve, a pressure sensor, a magnetostrictive displacement sensor, a servo cylinder, an electromagnetic ball valve and a damping hole, wherein the servo motor is positioned on the pump, the one-way valve is connected with an oil outlet end of the pump, an oil inlet of the servo valve is connected with the oil outlet end of the pump, a bypass is arranged on the oil outlet end of the pump, the pressure sensor, the electromagnetic ball valve and the damping hole pump are all arranged on the bypass at the oil outlet end of the pump, the electromagnetic ball valve is communicated with the pressure sensor of the servo valve, and the damping hole is connected with the electromagnetic ball valve. The method is simple and effective, and can obtain the pressure of the continuously adjustable system, so that the starting pressure of the servo cylinder can be accurately measured; the method has the characteristics of wide universality, low cost and simple test.)

1. The method for testing the starting pressure of the servo hydraulic cylinder is characterized by comprising a pump (1), a servo motor (2), a one-way valve (3), a pressure sensor (4), a magnetostrictive displacement sensor (5), a servo cylinder (6), an electromagnetic ball valve (7) and a damping hole (8), wherein the servo motor (2) is located on the pump (1), the one-way valve (3) is connected with an oil outlet end of the pump (1), an oil inlet of the servo valve is connected with the oil outlet end of the pump (1), a bypass is arranged on the oil outlet end of the pump (1), the pressure sensor (4), the electromagnetic ball valve (7) and the damping hole (8) are all arranged on the bypass of the oil outlet end of the pump (1), the electromagnetic ball valve (7) is communicated with the pressure sensor (4), and the damping hole (8) is connected with the electromagnetic ball valve (7).

2. The method for testing the starting pressure of the servo hydraulic cylinder as claimed in claim 1, wherein the method comprises the following steps: the damping hole (8) is used for fixing damping.

3. The method for testing the starting pressure of the servo hydraulic cylinder as claimed in claim 1, wherein the method comprises the following steps: the damping hole (8) can be selected to be 0.8-1.2 mm.

4. The method for testing the starting pressure of the servo hydraulic cylinder as claimed in claim 1, wherein the method comprises the following steps: and a magnetostrictive displacement sensor (5) is arranged at the tail end of the servo cylinder (6).

Technical Field

The invention relates to the technical field of servo hydraulic cylinders, in particular to a method for testing starting pressure of a servo hydraulic cylinder.

Background

At present, when the starting pressure of a hydraulic cylinder is tested, an overflow valve is mostly used for pressure regulation. The pressure in the oil cylinder is gradually increased by gradually increasing the set pressure of the overflow valve, and when the instant starting of the piston rod of the oil cylinder is detected, the pressure at the moment is the starting pressure of the hydraulic cylinder. The starting pressure of the common hydraulic cylinder is generally about 0.5Mpa, and an overflow valve can be selected for pressure regulation. The servo oil cylinder is generally a low-friction oil cylinder, and the starting pressure is generally lower than 0.05 Mpa. Because the starting pressure is too low, when the starting pressure of the servo cylinder is tested, a proper overflow valve cannot be selected for use for pressure regulation.

Disclosure of Invention

The embodiment of the invention provides a method for testing starting pressure of a servo hydraulic cylinder, which aims to solve the problems in the prior art.

The embodiment of the invention adopts the following technical scheme: a method for testing starting pressure of a servo hydraulic cylinder comprises a pump, a servo motor, a one-way valve, a pressure sensor, a magnetostrictive displacement sensor, the servo cylinder, an electromagnetic ball valve and a damping hole, wherein the servo motor is located on the pump, the one-way valve is connected with an oil outlet end of the pump, an oil inlet of the servo valve is connected with the oil outlet end of the pump, a bypass is arranged at the oil outlet end of the pump, the pressure sensor, the electromagnetic ball valve and the damping hole pump are all arranged on the bypass at the oil outlet end of the pump, the electromagnetic ball valve is communicated with the pressure sensor, and the damping hole is connected with the electromagnetic ball valve.

Further, the damping hole is a fixed damping.

Further, the damping hole can be selected to be 0.8-1.2 mm.

Furthermore, a magnetostrictive displacement sensor is arranged at the tail end of the servo cylinder.

The embodiment of the invention adopts at least one technical scheme which can achieve the following beneficial effects:

first, the invention adopts a simple and effective method which can obtain the pressure of the continuous adjustable system, thereby accurately measuring the starting pressure of the servo cylinder. The method has the characteristics of wide universality, low cost and simple test.

Secondly, the servo motor drives the pump to supply oil to the system, the damping hole is arranged on the bypass, after the electromagnetic ball valve is electrified, when the rotating speed of the servo motor is very low, the flow is very small, the pressure drop generated by the damping hole is smaller than the starting pressure of the servo cylinder, and at the moment, all the hydraulic oil directly returns to the oil tank through the damping hole. When the rotating speed of the servo motor is gradually increased, the pressure in the oil cylinder is increased through the pressure drop generated by the damping hole, when the critical point is reached, the servo cylinder is started, and the oil cylinder starting instant pressure recorded by the magnetostrictive displacement sensor and the pressure sensor is the starting pressure of the servo cylinder. Because the rotating speed of the servo motor is stepless and adjustable, extremely low and continuously adjustable pressure can be obtained.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention and not to limit the invention. In the drawings:

FIG. 1 is a schematic view of the present invention;

reference numerals:

the device comprises a pump 1, a servo motor 2, a one-way valve 3, a pressure sensor 4, a magnetostrictive displacement sensor 5, a servo cylinder 6, an electromagnetic ball valve 7 and a damping hole 8.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described below with reference to the specific embodiments of the present invention and the accompanying drawings. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The invention provides a method for testing the starting pressure of a servo hydraulic cylinder, which is shown in the following figure 1, and comprises a pump 1, a servo motor 2, a one-way valve 3, a pressure sensor 4, a magnetostrictive displacement sensor 5, a servo cylinder 6, an electromagnetic ball valve 7 and a damping hole 8, wherein the servo motor 2 is positioned on the pump 1, the one-way valve 3 is connected with the oil outlet end of the pump 1, the oil inlet of the servo valve is connected with the oil outlet end of the pump 1, a bypass is arranged at the oil outlet end of the pump 1, the pressure sensor 4, the electromagnetic ball valve 7 and the damping hole 8 are all arranged on the bypass at the oil outlet end of the pump 1, the electromagnetic ball valve 7 is communicated with the pressure sensor 4, and the damping hole 8 is connected with the electromagnetic ball valve 7. The servo motor 2 in the invention can also adopt a variable frequency motor.

Specifically, the damping hole 8 is a fixed damper. When hydraulic oil passes through the fixed damping hole 8, pressure drop is formed, the larger the flow is, the higher the pressure drop is, the higher the system pressure is, and the higher the pressure of the rodless cavity of the oil cylinder is.

In particular, the damping holes 8 may be selected to be 0.8-1.2 mm.

Specifically, the tail end of the servo cylinder 6 is provided with a magnetostrictive displacement sensor 5. The magnetostrictive displacement sensor 5 can detect the position of the piston rod.

The working principle of the invention is as follows: when the hydraulic oil return system is used, the servo motor 2 drives the pump 1 to supply oil to the system, the damping hole 8 is arranged on the bypass, after the electromagnetic ball valve 7 is electrified, when the rotating speed of the servo motor 2 is very low, the flow is very small, the pressure drop generated by the damping hole 8 is smaller than the starting pressure of the servo cylinder 6, and at the moment, all hydraulic oil can directly return to the oil tank through the damping hole 8; when the rotating speed of the servo motor 2 is gradually increased, the pressure in the oil cylinder 6 is increased through the pressure drop generated by the damping hole 8, when a critical point is reached, the servo cylinder 6 is started, the system pressure at the moment of starting the oil cylinder is recorded through the magnetostrictive displacement sensor 5 and the pressure sensor 4, namely the starting pressure of the servo cylinder 6, and because the rotating speed of the servo motor 2 is stepless and adjustable, extremely low and continuously adjustable pressure can be obtained.

The above description is only an example of the present invention, and is not intended to limit the present invention. Various modifications and alterations to this invention will become apparent to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the scope of the claims of the present invention.