CN201833182U - Variable constant-current static-pressure guide rail - Google Patents

Abstract

The utility model belongs to a variable constant-current static-pressure guide rail, which is particularly suitable for small static-pressure guide rails that require relatively large variation range of bearing capacity and variable static pressure lift. It is mainly composed of three parts: static pressure mechanism, oil circuit monitoring system and oil circuit control system. The static pressure mechanism includes eye pressure guide rails, constant flow oil supply devices and other components, which function as constant flow static pressure guide rails to ensure that the flow at each outlet point is consistent; the oil circuit monitoring system includes pressure sensors and flow sensors to monitor static pressure. The pressure and flow of the pressure chamber; the oil circuit control system mainly includes frequency conversion motors, PLC controllers and other components. By processing the signals fed back from the oil circuit monitoring system, the PLC controls the opening and speed of the frequency conversion motors to achieve control. The flow rate of the static pressure guide rail serves the purpose of balancing the lifting amount of the static pressure guide rail.

Description

Variable constant current static pressure guide rail

Field:

The utility model belongs to a constant-current static-pressure guide rail, and is especially suitable for a constant-current static-pressure guide rail mechanism matched with a super-heavy numerically controlled rotary workbench.

Background technique:

Due to the advantages of small frictional resistance, long service life, wide speed range, good anti-vibration performance, high motion precision, and good adaptability, hydrostatic guide rails are widely used in CNC machine tools.

The static pressure guide rail is divided into two types: the constant current static pressure guide rail and the constant pressure static pressure guide rail. The oil film stiffness of the constant current static pressure is higher than that of the constant pressure static pressure. The change relationship of the gap becomes the third power. The change of the load of the workbench will cause the change of the oil film gap, thereby changing the stiffness of the oil film. Basically remain unchanged, so the guide rails of the workbench generally adopt constant current hydrostatic guide rails.

With the development of modern machine tools in the direction of super-large specifications, the load-bearing weight of the workbench is also required to be larger and larger. The pressure difference between the empty-load and full-load of the super-heavy-duty workbench has reached more than 2 times. At this time, the constant current The lifting amount of the hydrostatic guide rail under small load is 1.25 times of that at full load, the oil film gap becomes larger, and the oil film stiffness becomes smaller, which will have a certain impact on the processing of the workpiece.

Invention content:

The main purpose of the utility model is to design a variable constant-current oil supply device suitable for the constant-current static pressure guide rail of the super-heavy workbench for the deficiencies in the prior art, so that it can meet the needs of small oil supply when the load is small. Quantity; large oil supply volume under heavy load.

The said variable constant current static pressure guide rail of the utility model mainly consists of three parts such as a static pressure mechanism, an oil circuit monitoring system and an oil circuit control system. The static pressure mechanism is composed of a constant current oil supply device and a static pressure guide rail plate; an open constant current static pressure guide rail is formed between the static pressure guide rail plate and the guide rail, and a static pressure cavity is arranged in the static pressure guide rail plate; the constant pressure driven by a frequency conversion motor The flow oil supply device is connected with the static pressure chamber of the static pressure guide rail plate; the oil circuit monitoring system is mainly composed of a flow sensor and a pressure sensor installed in front of the constant flow static pressure guide rail, and mainly plays the role of monitoring the pressure and flow of the outlet; The oil circuit control system is mainly composed of a variable frequency motor driving a constant current oil supply device and a PLC (programmable logic controller). The constant flow oil supply device driven by the frequency conversion motor is connected with the static pressure chamber of each static pressure guide rail plate in the way of one pump and one cavity, and the hydraulic oil is evenly distributed into each static pressure chamber through the constant flow oil supply device , to ensure that the flow rate of the hydrostatic oil in each hydrostatic chamber is the same. Each outlet of the constant flow oil supply device is provided with a pressure sensor and a flow sensor. Frequency conversion motor, pressure sensor and flow sensor are all connected with PLC.

Because the variable constant current static pressure guide rail mentioned in the utility model adopts the design of the constant current oil supply device driven by the frequency conversion motor, and monitors and manages according to the mode of one pump and one cavity, and uses PLC to judge the real-time export situation , through signal processing and feedback, properly control the working conditions of the constant flow oil supply device, outlet pressure, variable frequency motor, etc., to ensure that the outlet flow matches the load.

Description of drawings:

Attached Figure 1: Schematic diagram of the principle of the variable constant-current hydrostatic guide rail oil supply device;

Figure 2: Sectional view of the variable constant current static pressure guide rail.

Detailed ways:

Accompanying drawing 2 is the partial enlarged view of I part in accompanying drawing 1, is the sectional view of the said variable constant current hydrostatic guide rail part of the utility model. A static pressure guide rail is formed between the static pressure guide rail plate 5 and the guide rail 6, and a static pressure chamber 7 is arranged in the static pressure guide rail plate 5; the frequency conversion motor 2 is connected with the constant current oil supply device 1 and drives the constant current oil supply device 1, and the constant current oil supply device 1 The flow oil supply device 1 is connected to the static pressure chamber 7 in each static pressure guide rail in the form of one pump and one cavity. At the beginning, the frequency conversion motor runs at a specified speed at a constant speed, and the hydraulic oil is evenly distributed to the pump through the constant flow oil supply device. In each static pressure chamber, a constant flow open static pressure guide rail is formed.

Accompanying drawing 1 is the schematic diagram of the principle of the said variable constant current static pressure guide rail of the utility model. The hydraulic oil is uniformly outputted through the outlet of the constant flow oil supply device, and each outlet of the constant flow oil supply device 1 is provided with a pressure sensor 3 and a flow sensor 4, and the flow sensor 4 communicates with the static pressure chamber 7. Frequency conversion motor 2, pressure sensor 3 and flow sensor 4 are all connected with PLC.

The function of the flow sensor is to detect the outlet flow of the constant flow oil supply device, to ensure that there is sufficient static pressure oil on the guide rail, and to monitor whether the variable frequency motor is working at the required speed, and to protect the entire oil circuit; the pressure sensor detects in real time The pressure in the static pressure oil chamber is used for PLC to judge the current load condition. When the device is running, the PLC program first reads the pressure signals returned by each pressure sensor to judge the pressure. When the pressure is small, it indicates that the bearing weight is small, the system has a large buoyancy, and low flow is required. At this time, the part is closed through the PLC program. The constant flow oil supply device reduces the area of the total static pressure chamber, increases the oil pressure in the static pressure chamber, and reduces the lift of the entire system; when the pressure is high, it indicates that a large flow is required, and the PLC program directs the frequency conversion motor to run at high speed , The speed of the constant flow oil supply device increases, the outlet flow increases, and the flow in the static pressure chamber increases, ensuring that the entire system has sufficient buoyancy. Through the control of the frequency conversion motor, the lift of the whole system is within the specified range to meet the processing requirements of high-precision machine tools.

The double-dot dash line box on the right side in the accompanying drawing 1 shows that, in addition to the multi-head pump drawn in the figure, more constant-current oil supply device groups can also be added according to demand.

In addition, the constant flow oil supply device mentioned in the utility model can be a multi-head pump; it can also be a multi-point gear oil separator; it can also be a gear pump group with the same displacement; or it can be a combination of various fuel savers formed form.

Claims (6)

1. type variable constant current hydrostatic slideway, form by static pressure mechanism, oil circuit monitoring system, oil path control system three parts, it is characterized in that, static pressure mechanism is made up of constant current fueller and hydrostatic slideway plate, form hydrostatic slideway between hydrostatic slideway plate and the guide rail, be provided with the static pressure chamber in the hydrostatic slideway; Link by the constant current fueller of variable-frequency motor driving and the static pressure chamber of hydrostatic slideway; The oil circuit monitoring system is made up of the flow sensor that is installed in front, static pressure chamber, pressure sensor, is provided with pressure sensor and flow sensor in each outlet of constant current fueller; Oil path control system is made up of variable-frequency motor and the PLC that the constant current fueller carries, and promptly variable-frequency motor, pressure sensor and flow sensor all link with PLC.

2. according to the said type variable constant current of claim 1 hydrostatic slideway, it is characterized in that, said constant current fueller is connected on the static pressure chamber of each hydrostatic slideway according to the mode in a pump one chamber, and hydraulic oil is assigned in each static pressure chamber by the constant current fueller, forms the constant current open type static pressure guide rail.

3. according to the said type variable constant current of claim 1 hydrostatic slideway, it is characterized in that said constant current fueller is a multi-head pump.

4. according to the said type variable constant current of claim 1 hydrostatic slideway, it is characterized in that said constant current fueller is a multiple spot gear separator.

5. according to the said type variable constant current of claim 1 hydrostatic slideway, it is characterized in that said constant current fueller is the identical gear pump group of discharge capacity.

6. according to the said type variable constant current of claim 1 hydrostatic slideway, it is characterized in that said constant current fueller is combined by gasoline economizer.

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