CN103048126B - Loading device for load-unbalance experiment of static-pressure rotary table - Google Patents

Abstract

A static pressure turntable eccentric load test loading device is suitable for fixed-point eccentric load loading tests on small static pressure test turntables. It includes: a loading support frame, an L-shaped fixed plate, a hydraulic cylinder, a hydraulic cylinder joint, a pressure sensor, a connecting block, universal wheels and a flat plate. The anchor bolts of the four vertical columns of the loading support frame fix the entire loading device around the turntable to ensure that the loading device will not loosen or shift during the loading process; Cooperate with the bolt holes and use the universal wheel to contact with the flat plate of the table, which can realize the small adjustment and large adjustment of the loading position. The invention can realize that the position of the loading point relative to the oil pad of the turntable remains unchanged during the loading process, adjust the loading position according to the requirements of the loading test and accurately monitor the magnitude of the loading force, so that the loading device is only subjected to the force in the vertical direction during the loading process. The stability of the device is convenient for analyzing the data and results obtained from the eccentric loading test.

Description

A static pressure turntable eccentric load experiment loading device

technical field

The invention relates to a device for loading an eccentric load experiment on a static pressure turntable, and this type of loading device is particularly suitable for a fixed-point eccentric load loading test on a small static pressure turntable.

Background technique

The hydrostatic turntable is a functional component that uses hydrostatic bearings as a support and integrates the functions of the main shaft of the turntable and the function of the motor structurally. Its main function is to support and drive the workpiece to achieve precision/ultra-precision rotation and precision machining. The hydrostatic turntable uses pressure oil film as the working medium, which has high load-bearing stiffness characteristics, no wear between friction pairs, and sensitive and stable operation, which makes the hydrostatic turntable have extremely high rotation accuracy and positioning accuracy. And the instrument industry has been widely used.

In practical applications, due to the irregular shape of the workpiece, when it is fixed to the static pressure turntable, it is easy to cause the uneven load of the turntable, which affects the rotation stability of the static pressure turntable and the machining accuracy of the machine tool. Therefore, the research on the anti-eccentric load of the static pressure turntable The ability and the working performance of the turntable under the condition of partial load are very necessary, and the corresponding loading device for partial load experiment also has corresponding requirements. In the eccentric loading test, on the one hand, the loading force can be adjusted in real time and accurately according to the needs; Experimental data and performance analysis of the oil chamber under loading force.

To sum up, it is very important to design a device that can realize eccentric loading of the static pressure turntable to grasp the dynamic and static characteristics of the static pressure turntable.

Contents of the invention

The object of the present invention is to provide a static pressure turntable eccentric load experiment loading device that can accurately control the magnitude of the loading force and can adjust the position of the loading point according to the needs of the experiment. The invention can realize that during the loading process, the position of the loading point relative to the oil pad of the static pressure turntable remains unchanged, and the loading force can be adjusted in real time by adjusting the hydraulic valve, and the corresponding load value can be obtained from the pressure sensor; at the same time, the loading can be changed The position of the point is used to obtain the working performance of the static pressure turntable under different load points and different eccentric loads.

The present invention is realized by adopting the following technical means:

A loading device for eccentric load experiments on a static pressure turntable, which includes a support frame 1, an L-shaped fixed plate 2, a hydraulic cylinder 3, a hydraulic cylinder joint 4, a pressure sensor 5, a connecting block 6, a universal wheel 7, a flat plate 8 and turntable 9. The support frame 1 includes four vertical columns and two symmetrically distributed beams in a cross shape, which are welded by square cold-formed hollow steel. The four vertical columns are fixed around the turntable 9 by anchor bolts; the back of the L-shaped fixed plate 2 is open Waist-shaped groove A, fix the L-shaped plate 2 on the beam of the support frame 1 with bolts, and at the same time, open the hole B at the bottom of the L-shaped plate 2, and fix the hydraulic cylinder 3 and the L-shaped plate 2 together through bolts; Open two rows of bolt holes with a certain distance for adjusting the loading position; the two ends of the hydraulic cylinder joint 4 adopt the form of external thread, one end is connected with the hydraulic cylinder 3, and the other end is connected with the pressure sensor 5, and the pressure sensor 5 is connected with the pressure sensor 5. The hydraulic cylinders 3 are fixed together; the upper and lower ends of the pressure sensor 5 have threaded holes, the upper end is connected to the hydraulic cylinder 3 through the hydraulic cylinder joint 4, and the lower end is connected to the universal wheel 7 through the connecting block 6; the flat plate 8 is used as the universal wheel The rolling track of 7 is fixed on turntable 9 table tops.

Further, the pressure sensor 5 is an S-type pressure sensor, because the pressure sensor has threads for easy connection.

Using the above design scheme, its characteristics are:

(1) Using hydraulic cylinder to load, it is possible to control the magnitude of the loading force in real time, and accurately obtain the value of the loading force through the pressure sensor;

(2) After the entire loading device is fixed, its position remains unchanged relative to the oil pad fixed on the base of the turntable, so that during the rotation of the turntable, the position of the loading point relative to the oil chamber remains unchanged,

(3) The hydraulic cylinder and the support frame are connected by an L-shaped fixed plate. On the one hand, the loading position can be finely adjusted by adjusting the position of the waist groove on the back of the L-shaped fixed plate; There are bolt holes arranged at a certain interval. When a large adjustment of the loading position is required, it can be completed by changing the matching position of the bolts and the bolt holes on the crossbeam of the support frame. These two adjustment methods ensure the accuracy of the loading position.

(4) The use of universal wheels as the contact with the turntable surface can ensure that the loading device is only subjected to the force in the vertical direction, avoiding the interference of forces in other directions on the loading device.

Description of drawings

Figure 1 is a schematic diagram of the overall structure of the loading device for partial load experiments;

Figure 2 is a side view of the overall structure of the loading device for partial load experiments;

Fig. 3 is a schematic diagram of the local structure of the loading device;

Fig. 4 is a top view of the loading support frame structure;

Figure 5 is a three-way view of the L-shaped fixing plate;

Fig. 6 is a schematic diagram of the connection mode between the universal wheel and the connecting block;

Fig. 7 is a schematic diagram of the connection between the pressure sensor and the universal wheel.

In the figure: 1 is a support frame, 2 is an L-shaped fixed plate, 3 is a hydraulic cylinder, 4 is a hydraulic cylinder joint, 5 is a pressure sensor, 6 is a connecting block, 7 is a universal wheel, 8 is a flat plate, and 9 is a turntable.

Detailed ways

The present invention will be described in detail below in conjunction with the accompanying drawings.

As shown in Figure 1, Figure 2, and Figure 3, the loading device for the eccentric load experiment of the static pressure turntable is shown. In the figure, 1 is the support frame of the loading device, 2 is the L-shaped fixed plate, 3 is the hydraulic cylinder, 4 is the hydraulic cylinder joint, and 5 is the Pressure sensor, 6 is a connecting block, 7 is a universal wheel, 8 is a flat plate, and 9 is a turntable.

The supporting frame 1 of the loading device is respectively connected to the foundation and the L-shaped fixed plate 2 by bolts; the hydraulic cylinder 3 and the L-shaped fixed plate 2 are bolted to the bottom of the L-shaped fixed plate 2 through the flange of the hydraulic cylinder; the hydraulic cylinder joint 4 is passed through The threads at the upper and lower ends are respectively connected to the hydraulic cylinder 3 and the pressure sensor 5, and the pressure sensor 5 is connected to the hydraulic cylinder 3; the connecting block 6 connects the universal wheel 7 and the S-shaped pressure sensor through bolts, so that the loading force is along the vertical direction. Direction transmission: the flat plate 8 is fixed on the turntable table and rotates with the rotation of the turntable, and is in contact with the universal wheel 7 to ensure that the universal wheel can rotate smoothly during the loading process.

Fig. 4 is the supporting frame of the loading device, which includes four columns and two sections of crossbeams. The bottom corner discs of the four columns are fixed to the foundation with bolts, and two rows of through holes at a certain distance are opened on one section of the crossbeam. These through holes can be Cooperating with the waist-shaped groove of the L-shaped fixed plate to adjust the loading point of the loading device on the table surface of the static pressure turntable, small adjustments and large adjustments can be achieved.

Figure 5 is a three-way view of the L-shaped fixing plate, where A is the waist-shaped groove on the back of the L-shaped fixing plate, and B is the round hole at the bottom of the L-shaped fixing plate.

Figure 6 is a structural diagram of the connecting block and the universal wheel. The connecting block 6 is connected to the universal wheel 7 through four bolts. During the loading process, the universal wheel rotates with the rotation of the turntable on the one hand, and can automatically rotate Adjusting the rotation angle around the Z axis avoids the loading device from being disturbed by forces in other directions during the loading process.

Figure 7 is a schematic diagram of the connection structure of the pressure sensor 5, the connecting block 6 and the universal wheel 7. There are two baffles on the upper part of the connecting block 6, and the bottom of the pressure sensor 5 is stuck in the middle of the two baffles, and the pressure sensor 5 is connected by a hexagon socket bolt. It is fixed with the connection block 6 to prevent the loosening between the pressure sensor 5 and the connection block 6 caused by the rotation of the turntable during the loading test; the lower part of the connection block is connected to the universal wheel 7 through the bolts on the four corners.

Claims (2)

1. A static pressure turntable eccentric loading experiment loading device, the device is to include a support frame, an L-shaped fixed plate, a hydraulic cylinder, a hydraulic cylinder connector, a pressure sensor, a connecting block, a universal wheel, a flat plate and a turntable; the support frame includes four Four vertical columns are fixed around the turntable by anchor bolts; the back of the L-shaped fixed plate has a waist-shaped groove A, and the L-shaped plate is fixed on the beam of the support frame with bolts. At the same time, hole B is opened at the bottom of the L-shaped plate, and the hydraulic cylinder and the L-shaped plate are fixed together by bolts; at least two rows of bolt holes for adjusting the loading position with a certain distance are opened on the beam; the two hydraulic cylinder joints The end adopts the form of external thread, one end is connected to the hydraulic cylinder, and the other end is connected to the pressure sensor, and the pressure sensor and the hydraulic cylinder are fixed together; the upper and lower ends of the pressure sensor are threaded holes, and the upper end is connected to the hydraulic cylinder through the hydraulic cylinder joint. , the lower end is connected with the universal wheel through the connecting block; the flat plate is fixed on the turntable table as the rolling track of the universal wheel. 2. The static pressure turntable eccentric loading experiment loading device according to claim 1, characterized in that the pressure sensor is an S-type pressure sensor.