CN108584792A - A kind of mechanical lift device for low force test platform - Google Patents

Abstract

The invention discloses a kind of mechanical lift device for low force test platform, including lifting mechanism, actuating unit and control mechanism, lifting mechanism includes holder, oil cylinder and pallet, oil cylinder is set on holder, pallet passes through holder, and is fixedly connected at the top of oil cylinder, and clump weight is set on pallet；Actuating unit includes the hydraulic pressure inflow pipeline being connected with oil cylinder and hydraulic pressure flowline, lifting solenoid directional control valve, the valve that contends with, the first hydraulic control one-way valve, the first one-way throttle valve and the first solenoid directional control valve are provided on hydraulic pressure inflow pipeline, the second one-way throttle valve, the second hydraulic control one-way valve are provided on hydraulic pressure flowline, contend with valve and lifting solenoid directional control valve, the first solenoid directional control valve and lifting solenoid directional control valve be connected respectively with control mechanism.The present invention can drive external disturbance mass block to be lifted in vertical direction, and can realize that the lifting position of external disturbance mass block accurately controls, to meeting the accuracy requirement of low force test platform.

Description

A mechanical lifting device for weak force testing platform

technical field

The invention relates to the field of weak force testing equipment, in particular to a mechanical lifting device for a weak force testing platform.

Background technique

The absolute gravimeter is mainly used to measure the absolute value of the acceleration of gravity on the earth's surface. The absolute gravity value of a specific area on the earth's surface is measured by the absolute gravimeter. The absolute gravity value measured by the absolute gravimeter reflects the material inside the earth in this area. distribution status. When the earth's surface has a mineralization structure, the density of the ore-forming body usually has a certain difference from the density of the surrounding crust, and this density difference will produce a gravitational disturbance relative to the normal gravitational field. Using this gravitational disturbance and geological The size and position of the structure can be inferred by inversion calculation to infer the purpose difference of the disturbed object, and then infer the characteristics of the ore body according to the density difference, invert the geological structure fluctuation of the area, and then analyze and identify the area based on the geological data of the area. possible mineralization structures in the region.

After the absolute gravimeter is used for a period of time, the measurement accuracy of the instrument will change. The weak force test platform is used to test the various indicators of the absolute gravimeter. When the weak force test platform is in use, an additional known gravitational field is added to the outside of the absolute gravimeter, and the classical formula of universal gravitation is used to calculate the influence of the gravitational field on the acceleration of gravity at different distances, and then the point is observed through the absolute gravimeter measurement technology The change of the acceleration of gravity at the place is compared with the theoretical value to analyze and judge the sensitivity of the absolute gravimeter.

The weak force test platform mainly includes the observation pier, lifting platform and additional mass block. The observation pier is used to erect the absolute gravimeter to reduce the influence of environmental interference factors on the observation instrument. The lifting mechanism is used to lift the external additional mass The displacement of the body, and the external additional mass body is used to generate disturbance gravity. The main function of the lifting platform is to lift the external disturbance mass in the vertical direction, so that the external additional mass is close to the absolute gravimeter at different distances, and apply external gravitational fields of different sizes, so as to detect the absolute gravity in the vertical direction. Gravimeters are sensitive to gravitational fields of different sizes. Considering the accuracy of the weak force test platform, there are high requirements for the measurement and control accuracy of the operating position of the lifting platform. Existing lifting platforms generally use manual hoists. Manual hoist lifting has the problems of time-consuming and laborious operation, poor safety, and limited operating space, and the position of the manual hoist is difficult to control, making it difficult to meet the requirements for the accuracy of the lifting platform.

Contents of the invention

The purpose of the present invention is to provide a mechanical lifting device for a weak force test platform, which can drive the external disturbance mass to lift in the vertical direction, and can realize precise control of the lifting position of the external disturbance mass, thereby realizing The precise detection of the sensitivity of the absolute gravimeter meets the accuracy requirements of the weak force test platform.

To achieve the above object, the present invention adopts the following technical solutions:

A mechanical lifting device for a weak force testing platform, including a lifting mechanism, a power mechanism and a control mechanism. The lifting mechanism includes a bracket, an oil cylinder and a tray. The bottom of the oil cylinder is set on the bracket, and the tray passes through the bracket, and the The top is fixedly connected, the counterweight is set on the pallet, and the oil cylinder is connected with the power mechanism;

The power mechanism includes a hydraulic oil inlet pipeline and a hydraulic oil outlet pipeline connected with the oil cylinder, the hydraulic oil inlet pipeline and the hydraulic oil outlet pipeline are both connected to the hydraulic station, and the hydraulic oil inlet pipeline is sequentially provided with lifts along the flow direction of the hydraulic oil. Electromagnetic reversing valve, counterbalance valve, first hydraulic control check valve, first one-way throttle valve and first electromagnetic reversing valve, the hydraulic oil outlet pipeline is provided with second one-way joints in sequence along the flow direction of hydraulic oil Flow valve, second hydraulic control check valve, counterbalance valve and lifting electromagnetic reversing valve, the first electromagnetic reversing valve and lifting electromagnetic reversing valve are respectively connected with the control mechanism, the oil cylinder is provided with a displacement sensor, and the displacement sensor is connected with the The control mechanism is connected;

The control mechanism adopts PLC.

Preferably, there are two oil cylinders, and the two oil cylinders are respectively fixedly connected to the bottom of the pallet, and there are two first electromagnetic reversing valves, and the two first electromagnetic reversing valves are respectively arranged on the hydraulic oil inlet pipes of the two oil cylinders superior.

Preferably, the support includes a base and two anti-overturning sliding posts, the oil cylinder and the anti-overturning sliding posts are fixedly arranged on the base, the tray passes through the two anti-overturning sliding posts, and is fixedly connected to the upper end of the oil cylinder.

Preferably, the two oil cylinders and the two anti-overturning sliding posts are arranged at intervals on the base, the two oil cylinders are arranged symmetrically along the center of the tray, and the two anti-overturning sliding posts are arranged symmetrically along the center of the tray.

Preferably, an upper limit switch and a lower limit switch are provided on the two anti-overturning sliding columns, and the upper limit switch and the lower limit switch are respectively connected with the control mechanism.

Preferably, the hydraulic station includes an oil tank, a motor, an oil pump, an oil filter, an overflow valve, a liquid level gauge and a pressure gauge, the hydraulic oil inlet pipeline and the hydraulic oil outlet pipeline are respectively connected with the oil tank, and the oil pump is arranged On the pipeline, the oil pump is connected with the motor, and an overflow pipeline is arranged in the oil tank. The overflow valve and the pressure gauge are respectively arranged on the overflow pipeline. The liquid level gauge is arranged in the oil tank, and the liquid level gauge and the pressure gauge are respectively connected with the control mechanism.

Preferably, the counterweight adopts a lead block, and the lead block is a cylinder, and a positioning column for limiting the counterweight is provided in the middle of the tray, and the positioning column passes through the lead block.

The invention drives the external disturbance mass block to rise and fall in the vertical direction through the lifting mechanism, provides power for the lifting mechanism through the power mechanism, and controls the lifting position of the external disturbance mass block through the control mechanism, thereby realizing the control of the absolute gravimeter. The precise detection of sensitivity can meet the accuracy requirements of the weak force test platform; the lifting mechanism adopts an oil cylinder, and the power mechanism can prevent the oil cylinder from drifting, prevent the counterweight from falling under the action of gravity, and ensure that the oil cylinder rises and falls smoothly; the oil cylinder has two , the two oil cylinders are equipped with displacement sensors, according to the positions detected by the two displacement sensors, the power mechanism acts under the action of the PLC, so that the two oil cylinders can rise and fall synchronously, ensuring that the counterweight moves up and down smoothly, and at the same time The precise control of the position of the counterweight can be realized.

Description of drawings

Fig. 1 is a structural schematic diagram 1 of the lifting mechanism of the present invention;

Fig. 2 is a structural schematic diagram II of the lifting mechanism of the present invention;

Fig. 3 is a structural schematic diagram of the lifting mechanism when the oil cylinder of the present invention rises to the highest point;

Fig. 4 is a schematic structural diagram of the power mechanism of the present invention.

Detailed ways

The technical solutions of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Apparently, the described embodiments are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

As shown in Figures 1 to 4, a mechanical lifting device for a weak force testing platform according to the present invention includes a lifting mechanism, a power mechanism and a control mechanism, and the lifting mechanism is used to drive the counterweight up and down, The power mechanism is used to drive the lifting mechanism, and the control mechanism is used to control the lifting mechanism. The control mechanism includes a PLC and a control panel. The control panel is used to set the lifting height of the counterweight, and the PLC is used to set The height is used to control the work of the power mechanism, thereby controlling the lifting height of the counterweight.

The lifting mechanism includes a bracket, an oil cylinder 4 and a tray 3, the bracket includes a base 5 and an anti-overturning sliding column 1, the oil cylinder 4 and the anti-overturning sliding column 1 are fixedly arranged on the base 5, the tray 3 passes through the anti-overturning sliding column 1, and The upper end of the oil cylinder 4 is fixedly connected, and the counterweight 2 is arranged on the tray 3. In this embodiment, the counterweight 2 adopts a lead block, which is a cylinder, and the middle part of the tray 3 is provided with a positioning column, which passes through the The middle part of the lead block is set, and the positioning column is used to limit the position of the counterweight 2; there are two oil cylinders 4 and two anti-overturning sliding columns 1, and the two oil cylinders 4 and two anti-overturning sliding columns 1 are arranged on the base 5 at intervals. Two oil cylinders 4 are arranged symmetrically along the center of the pallet 3, two anti-overturning sliding columns 1 are arranged symmetrically along the center of the tray 3, displacement sensors are arranged on the two oil cylinders 4, the displacement sensors are connected with PLC, and the two anti-overturning sliding columns 1 are provided with an upper limit switch and a lower limit switch, and the upper limit switch and the lower limit switch are respectively connected with the PLC mechanism.

The power mechanism includes a hydraulic oil inlet pipeline 7 and a hydraulic oil outlet pipeline 13 connected with the oil cylinder 4. The hydraulic oil inlet pipeline 7 and the hydraulic oil outlet pipeline 13 are both connected to the hydraulic station 6. The direction is provided with a lifting electromagnetic reversing valve 12, a counterbalance valve 8, a first hydraulic control check valve 9-1, a first one-way throttle valve 10-1, and a first electromagnetic reversing valve 11. The first electromagnetic reversing valve There are two valves 11, which are respectively arranged on the hydraulic oil inlet pipes 7 of the two oil cylinders 4. The hydraulic oil outlet pipe 13 is sequentially provided with a second one-way throttle valve 10-2, a second hydraulic oil outlet pipe 13 along the flow direction of the hydraulic oil. Control check valve 9-2, counterbalance valve 8 and lifting electromagnetic reversing valve 12, first electromagnetic reversing valve 11 and lifting electromagnetic reversing valve 12 are connected with PLC respectively; Lifting electromagnetic reversing valve 12 is used to control oil cylinder 4 Up and down displacement, in this embodiment, the lifting electromagnetic reversing valve 12 adopts a three-position four-way electromagnetic valve, which can make the oil pump in an unloaded state when the oil cylinder 4 is in a static state, and the counterweight valve 8 is used to prevent the counterweight 2 from being under gravity. Falling under the action can also make the balance weight 2 more even and stable when lifting and lowering. The first hydraulic control check valve 9-1 and the second hydraulic control check valve 9-2 are connected in parallel to form a double hydraulic control check valve. The control check valve is used to prevent the oil cylinder 4 from drifting, and can prevent the counterweight 2 from falling at the same time. The first one-way throttle valve 10-1 and the second one-way throttle valve 10-2 are used to adjust the counterweight 2 to rise and fall. The first electromagnetic reversing valve 11 is used to control the synchronous action of the oil cylinder 4. According to the positions detected by the two displacement sensors, the first electromagnetic reversing valve 11 acts under the action of PLC, so that the two oil cylinders 4 can Synchronized rise and fall.

Hydraulic station 6 includes oil tank 6-3, motor 6-1, oil pump 6-2, overflow valve 6-4, liquid level gauge 6-6 and pressure gauge 6-5, hydraulic oil inlet pipeline 7 and hydraulic oil outlet pipeline 13 They are respectively connected with the oil tank 6-3, the oil pump 6-2 is arranged on the hydraulic oil inlet pipeline 7, the oil pump 6-2 is connected with the motor 6-1, an overflow pipeline is provided in the oil tank 6-3, and an overflow valve 6-4 and the pressure gauge 6-5 are respectively arranged on the overflow pipe, and the liquid level gauge 6-6 is arranged in the oil tank 6-3.

When the present invention is working, under the action of the motor 6-1, the oil pump 6-2 drives the hydraulic oil in the oil tank 6-3 to enter the oil cylinder 4 along the hydraulic oil inlet pipeline 7, and the piston cylinder of the oil cylinder 4 pushes the counterweight 2 to rise, When the counterweight 2 touches the upper limit switch, the control mechanism controls the lifting electromagnetic reversing valve 12 to lose power, and the oil cylinder 4 stops moving; the motor 6-1 is turned off, the counterweight 2 falls under the action of gravity, and the hydraulic pressure in the oil cylinder 4 The oil flows back into the oil tank 6-3 through the hydraulic oil outlet pipeline 13. When the counterweight 2 touches the lower limit switch, the control mechanism controls the lifting electromagnetic reversing valve 12 to lose power, and the oil cylinder 4 stops moving; the oil cylinder 4 is rising and falling During the process, the control mechanism can make the counterweight 2 stop at any position by controlling the opening and closing of the lifting electromagnetic reversing valve 12 .

The invention can drive the external disturbance mass to lift in the vertical direction, and can realize precise control of the lifting position of the external disturbance mass, thereby realizing accurate detection of the sensitivity of the absolute gravimeter and meeting the precision requirements of the weak force test platform.

Claims (7)

1. a kind of mechanical lift device for low force test platform, it is characterised in that：Including lifting mechanism, actuating unit and control Mechanism processed, lifting mechanism include holder, oil cylinder and pallet, and the bottom of oil cylinder is set on holder, and pallet passes through holder, with oil cylinder Top be fixedly connected, clump weight is set on pallet, and oil cylinder is connected with actuating unit；

The actuating unit includes the hydraulic pressure inflow pipeline being connected with oil cylinder and hydraulic pressure flowline, hydraulic pressure inflow pipeline and liquid It extrudes oil-piping to be connected with hydraulic station, the circulating direction of hydraulic pressure inflow pipeline upper edge hydraulic oil is disposed with lifting electromagnetism and changes To valve, the valve that contends with, the first hydraulic control one-way valve, the first one-way throttle valve and the first solenoid directional control valve, hydraulic pressure flowline upper edge liquid The circulating direction of pressure oil is disposed with the second one-way throttle valve, the second hydraulic control one-way valve, contend with valve and lifting solenoid directional control valve, First solenoid directional control valve and lifting solenoid directional control valve are connected with control mechanism respectively, and displacement sensor is provided on the oil cylinder, Displacement sensor is connected with control mechanism；

The control mechanism uses PLC.

2. a kind of mechanical lift device for low force test platform as described in claim 1, it is characterised in that：The oil cylinder There are two, two oil cylinders are fixedly linked with the bottom of pallet respectively, and there are two the first solenoid directional control valves, two the first electromagnetic switch Valve is respectively arranged on the hydraulic pressure inflow pipeline of two oil cylinders.

3. a kind of mechanical lift device for low force test platform as claimed in claim 4, it is characterised in that：The holder Including pedestal and two overturn-preventing travellers, oil cylinder and overturn-preventing traveller are fixedly installed on pedestal, and pallet passes through two anti-dumpings Traveller is covered, is fixedly connected with the upper end of oil cylinder.

4. a kind of mechanical lift device for low force test platform as claimed in claim 3, it is characterised in that：It is described two Oil cylinder and two overturn-preventing travellers are arranged at intervals on pedestal, and two oil cylinders are along the center symmetric setting of pallet, two overturn-preventings Center symmetric setting of the traveller along pallet.

5. a kind of mechanical lift device for low force test platform as claimed in claim 4, it is characterised in that：Two anti-dumpings Cover and be both provided with upper limit position switch and lower position switch on traveller, upper limit position switch and lower position switch respectively with control mechanism phase Even.

6. a kind of mechanical lift device for low force test platform as described in claim 1 or 5, it is characterised in that：It is described Hydraulic station includes fuel tank, motor, oil pump, oil filter, overflow valve, liquid level gauge and pressure gauge, and hydraulic pressure inflow pipeline and hydraulic pressure are fuel-displaced Pipeline is connected with fuel tank respectively, and oil pump is set on hydraulic pressure inflow pipeline, and oil pump is connected to the motor, and overflow pipe is equipped in fuel tank Road, overflow valve and pressure gauge are respectively arranged on overflow pipe, and liquid level gauge is set in fuel tank, liquid level gauge and pressure gauge respectively with Control mechanism is connected.

7. a kind of mechanical lift device for low force test platform as claimed in claim 6, it is characterised in that：The counterweight Block uses lead, and lead is cylinder, the positioning vertical column for being limited to clump weight is provided in the middle part of pallet, positioning vertical column is worn Cross lead setting.