CA3002263C - Intelligent feedback variable-throttle buffering system and buffering method thereof - Google Patents
Intelligent feedback variable-throttle buffering system and buffering method thereof Download PDFInfo
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Abstract
An intelligent feedback variable throttle buffering system and a buffering method. In the buffering system, a linear cylinder is connected to a linear motor and to a stroke control valve block, which is connected to a buffer cylinder; the buffer cylinder is connected to a throttle control valve block, and to a cylinder head, which is connected to speed and displacement sensors; a controller, a pressure sensor and a step motor coaxial with the buffer cylinder are connected on the throttle control valve block. The buffering system has the following advantages: the buffering capacity varies with the impact load; a closed-loop control system automatically regulates buffer stroke and throttling area; buffering in a wide range of impact loads is realized; an automatic detection and control system buffers against uncertain impact loads; the size of the power source is decreased; hydraulic oil leakage from a hydraulic buffer can be compensated.
Description
Title of the Invention Intelligent Feedback Variable-Throttle Buffering System and Buffering Method Thereof I. Field of the Invention The present invention relates to a variable-throttle buffering system and a buffering method thereof, particularly to an intelligent feedback variable-throttle buffering system and buffering method thereof.
II. Background of the Invention Buffer devices are an indispensable part of various machines. However, existing buffer devices only support manual regulation of the buffer capacity within a narrow range, are at a low automation level, cannot support real-time regulation of the buffer capacity and stroke according to the impact load, cannot buffer against overload, and cannot protect the machines reliably; the buffer capacity can be used only within its rated buffer capacity, and cannot meet the requirement for buffering against wide-span impacts and uncertain impacts.
The Chinese Patent Publication No. CN202251621 has disclosed a hydraulic buffer which can regulate buffer power automatically. The structure of the hydraulic buffer mainly comprises a piston, a piston rod, a cylinder, a sponge, a seal ring, a guide sleeve, and a valve plate. The operating process of the hydraulic buffer is as follows:
an oil drain passage is arranged in the piston, and the flow rate of the oil flowing through the oil drain passage is controlled by the valve plate; when the external impact force is increased suddenly, the rim of the valve plate will cling to the piston closely, the flow rate of the oil flowing through the oil drain passage will be decreased, and thereby the buffer power will be increased; when the external impact force is decreased, the rim of the valve plate will recover to the original state slowly, the flow rate of the oil flowing through the oil drain passage will be increased, and the buffer power will be decreased accordingly. In that way, the buffer power is regulated automatically as the impact force. However, the hydraulic buffer has the following =l=
drawbacks: the buffer capacity cannot be regulated, and buffering against impact load under an overload condition cannot be achieved effectively; not mention to self-adaptive regulation of buffering with the operating condition; in addition, the intelligent level is very low.
.. III. Summary of the Invention The object of the present invention is to provide an intelligent feedback variable-throttle buffer system, which solves the problem that the existing buffer devices can be used only within their rated buffer capacity and cannot meet the requirement for buffering against wide-span impacts and uncertain impacts.
.. The object of the present invention is attained as follows: the present invention includes an intelligent feedback variable-throttle buffering system and a buffering method thereof.
The buffering system regulates the buffer capacity automatically within a wide range by means of closed-loop control with the speed sensor and pressure sensor. The specific structure comprises: a linear motor, a linear cylinder, a stroke control valve block, a step motor, a throttle control valve block, an acquisition processor, a controller, a pressure sensor, a buffer cylinder, a cylinder head of the buffer cylinder, a speed sensor, and a displacement sensor.
One end of the linear cylinder is connected to the linear motor; the other end of the linear cylinder is connected to the stroke control valve block, and the stroke control valve block is connected through a pipeline to the buffer cylinder; one end of the buffer cylinder is connected to the throttle control valve block, and the other end of the buffer cylinder is connected to the cylinder head of the buffer cylinder;
the speed sensor and the displacement sensor are connected on the cylinder head of the buffer cylinder; the acquisition processor, the controller and the pressure sensor are connected on the throttle control valve block; the step motor coaxial with the buffer cylinder is connected on the throttle control valve block; the output end of the controller is connected to the proportional control valves, the step motor, and the linear motor respectively; the output ends of the pressure sensor, the speed sensor and the displacement sensor are connected to the input end of the acquisition processor, .2.
and the controller controls the valves or motors respectively on the basis of the input signals of the acquisition processor.
The controller is a single-chip controller or PLC controller.
The buffer cylinder comprises: a support rod, a piston rod of the buffer cylinder, a rod cavity pipe of the buffer cylinder, an oil tank, a replenishing valve, a rod-less cavity pipe of the buffer cylinder, an oil return pipe, an outer cylinder of the buffer cylinder, a return spring, an inner cylinder of the buffer cylinder, a piston of the buffer cylinder, and a reset piston of the buffer cylinder.
The outer cylinder of the buffer cylinder is sleeved over the inner cylinder of the buffer cylinder, a return spring, a screw rod, and the reset piston of the buffer cylinder are disposed between the outer cylinder of the buffer cylinder and the inner cylinder of the buffer cylinder; the cylinder head of the buffer cylinder is arranged on one end of the outer cylinder of the buffer cylinder and the inner cylinder of the buffer cylinder, and the support rod connects the outer cylinder of the buffer cylinder and the inner cylinder of the buffer cylinder to the throttle control valve block via the cylinder head of the buffer cylinder; the piston of the buffer cylinder is disposed in the inner cylinder of the buffer cylinder; one end of the piston rod of the buffer cylinder is connected to the piston of the buffer cylinder, and the other end of the piston rod of the buffer cylinder protrudes through the cylinder head of the buffer cylinder; the oil tank is disposed at a side of the outer cylinder of the buffer cylinder, and the oil return pipe is connected between the oil tank and the stroke control valve block; the rod-less cavity pipe of the buffer cylinder is connected between the stroke control valve block and the throttle control valve block; the rod cavity pipe of the buffer cylinder and the replenishing valve are connected between the stroke control valve block and the cylinder head of the buffer cylinder.
The throttle control valve block comprises: a plug, a throttling orifice, a coupling, a screw rod and a valve spool.
The coupling, the screw rod, and the valve spool are connected sequentially at the center of the end of the throttle control valve block that is connected to the step motor;
the plug and the throttling orifice are connected sequentially at the end of the throttle .3.
control valve block that is connected to the buffer cylinder, one side of the throttling orifice communicates with a rod-less cavity of the buffer cylinder, and the other side of the throttling orifice communicates with a reset cavity of the buffer cylinder.
The linear cylinder comprises: a three-position two-way proportional valve of the rod cavity, a three-position two-way proportional valve of the rod-less cavity, a cylinder head of the linear cylinder, a piston of the linear cylinder, an oil circuit of the stroke control valve block, a piston rod of the linear cylinder, and a vent hole.
The three-position two-way proportional valve of the rod cavity and the three-position two-way proportional valve of the rod-less cavity are connected on the stroke control valve block connected to the linear cylinder; the oil circuit of the stroke control valve block is disposed in the stroke control valve block; the cylinder head of the linear cylinder is connected to the other end of the linear cylinder, and the cylinder head of the linear cylinder is disposed between the linear cylinder and the linear motor; the vent hole is arranged on the cylinder head of the linear cylinder; the piston of the linear cylinder is disposed in the linear cylinder, the piston rod of the linear cylinder is connected to the piston of the linear cylinder, and the piston rod of the linear cylinder is connected to the linear motor; the oil circuit of the stroke control valve block communicates with the oil tank, a rod cavity oil passage of the buffer cylinder, a rod-less cavity oil passage of the buffer cylinder, and the linear cylinder.
The speed sensor is mounted on the top of the buffer cylinder. The buffering method is as follows:
(1) the speed sensor detects the speed of an impact object, and the buffer stroke and initial pressure are regulated in real time via the stroke control valve block;
II. Background of the Invention Buffer devices are an indispensable part of various machines. However, existing buffer devices only support manual regulation of the buffer capacity within a narrow range, are at a low automation level, cannot support real-time regulation of the buffer capacity and stroke according to the impact load, cannot buffer against overload, and cannot protect the machines reliably; the buffer capacity can be used only within its rated buffer capacity, and cannot meet the requirement for buffering against wide-span impacts and uncertain impacts.
The Chinese Patent Publication No. CN202251621 has disclosed a hydraulic buffer which can regulate buffer power automatically. The structure of the hydraulic buffer mainly comprises a piston, a piston rod, a cylinder, a sponge, a seal ring, a guide sleeve, and a valve plate. The operating process of the hydraulic buffer is as follows:
an oil drain passage is arranged in the piston, and the flow rate of the oil flowing through the oil drain passage is controlled by the valve plate; when the external impact force is increased suddenly, the rim of the valve plate will cling to the piston closely, the flow rate of the oil flowing through the oil drain passage will be decreased, and thereby the buffer power will be increased; when the external impact force is decreased, the rim of the valve plate will recover to the original state slowly, the flow rate of the oil flowing through the oil drain passage will be increased, and the buffer power will be decreased accordingly. In that way, the buffer power is regulated automatically as the impact force. However, the hydraulic buffer has the following =l=
drawbacks: the buffer capacity cannot be regulated, and buffering against impact load under an overload condition cannot be achieved effectively; not mention to self-adaptive regulation of buffering with the operating condition; in addition, the intelligent level is very low.
.. III. Summary of the Invention The object of the present invention is to provide an intelligent feedback variable-throttle buffer system, which solves the problem that the existing buffer devices can be used only within their rated buffer capacity and cannot meet the requirement for buffering against wide-span impacts and uncertain impacts.
.. The object of the present invention is attained as follows: the present invention includes an intelligent feedback variable-throttle buffering system and a buffering method thereof.
The buffering system regulates the buffer capacity automatically within a wide range by means of closed-loop control with the speed sensor and pressure sensor. The specific structure comprises: a linear motor, a linear cylinder, a stroke control valve block, a step motor, a throttle control valve block, an acquisition processor, a controller, a pressure sensor, a buffer cylinder, a cylinder head of the buffer cylinder, a speed sensor, and a displacement sensor.
One end of the linear cylinder is connected to the linear motor; the other end of the linear cylinder is connected to the stroke control valve block, and the stroke control valve block is connected through a pipeline to the buffer cylinder; one end of the buffer cylinder is connected to the throttle control valve block, and the other end of the buffer cylinder is connected to the cylinder head of the buffer cylinder;
the speed sensor and the displacement sensor are connected on the cylinder head of the buffer cylinder; the acquisition processor, the controller and the pressure sensor are connected on the throttle control valve block; the step motor coaxial with the buffer cylinder is connected on the throttle control valve block; the output end of the controller is connected to the proportional control valves, the step motor, and the linear motor respectively; the output ends of the pressure sensor, the speed sensor and the displacement sensor are connected to the input end of the acquisition processor, .2.
and the controller controls the valves or motors respectively on the basis of the input signals of the acquisition processor.
The controller is a single-chip controller or PLC controller.
The buffer cylinder comprises: a support rod, a piston rod of the buffer cylinder, a rod cavity pipe of the buffer cylinder, an oil tank, a replenishing valve, a rod-less cavity pipe of the buffer cylinder, an oil return pipe, an outer cylinder of the buffer cylinder, a return spring, an inner cylinder of the buffer cylinder, a piston of the buffer cylinder, and a reset piston of the buffer cylinder.
The outer cylinder of the buffer cylinder is sleeved over the inner cylinder of the buffer cylinder, a return spring, a screw rod, and the reset piston of the buffer cylinder are disposed between the outer cylinder of the buffer cylinder and the inner cylinder of the buffer cylinder; the cylinder head of the buffer cylinder is arranged on one end of the outer cylinder of the buffer cylinder and the inner cylinder of the buffer cylinder, and the support rod connects the outer cylinder of the buffer cylinder and the inner cylinder of the buffer cylinder to the throttle control valve block via the cylinder head of the buffer cylinder; the piston of the buffer cylinder is disposed in the inner cylinder of the buffer cylinder; one end of the piston rod of the buffer cylinder is connected to the piston of the buffer cylinder, and the other end of the piston rod of the buffer cylinder protrudes through the cylinder head of the buffer cylinder; the oil tank is disposed at a side of the outer cylinder of the buffer cylinder, and the oil return pipe is connected between the oil tank and the stroke control valve block; the rod-less cavity pipe of the buffer cylinder is connected between the stroke control valve block and the throttle control valve block; the rod cavity pipe of the buffer cylinder and the replenishing valve are connected between the stroke control valve block and the cylinder head of the buffer cylinder.
The throttle control valve block comprises: a plug, a throttling orifice, a coupling, a screw rod and a valve spool.
The coupling, the screw rod, and the valve spool are connected sequentially at the center of the end of the throttle control valve block that is connected to the step motor;
the plug and the throttling orifice are connected sequentially at the end of the throttle .3.
control valve block that is connected to the buffer cylinder, one side of the throttling orifice communicates with a rod-less cavity of the buffer cylinder, and the other side of the throttling orifice communicates with a reset cavity of the buffer cylinder.
The linear cylinder comprises: a three-position two-way proportional valve of the rod cavity, a three-position two-way proportional valve of the rod-less cavity, a cylinder head of the linear cylinder, a piston of the linear cylinder, an oil circuit of the stroke control valve block, a piston rod of the linear cylinder, and a vent hole.
The three-position two-way proportional valve of the rod cavity and the three-position two-way proportional valve of the rod-less cavity are connected on the stroke control valve block connected to the linear cylinder; the oil circuit of the stroke control valve block is disposed in the stroke control valve block; the cylinder head of the linear cylinder is connected to the other end of the linear cylinder, and the cylinder head of the linear cylinder is disposed between the linear cylinder and the linear motor; the vent hole is arranged on the cylinder head of the linear cylinder; the piston of the linear cylinder is disposed in the linear cylinder, the piston rod of the linear cylinder is connected to the piston of the linear cylinder, and the piston rod of the linear cylinder is connected to the linear motor; the oil circuit of the stroke control valve block communicates with the oil tank, a rod cavity oil passage of the buffer cylinder, a rod-less cavity oil passage of the buffer cylinder, and the linear cylinder.
The speed sensor is mounted on the top of the buffer cylinder. The buffering method is as follows:
(1) the speed sensor detects the speed of an impact object, and the buffer stroke and initial pressure are regulated in real time via the stroke control valve block;
(2) when the impact object comes into contact with the head of a piston rod, the speed sensor detects the speed of the impact object in real time, the pressure sensor detects the pressure in a buffer chamber in real time, the measured speed signal and pressure signal are inputted to the acquisition processor, the acquisition processor performs conversion and calculation of the data, and transmits the processed data to the controller, the controller outputs a control signal, and controls the throttling area of a buffer device via the throttle control valve block.
The specific steps are as follows:
The speed sensor detects the speed v2 of the current impact object, the pressure sensor in the buffer cavity of the buffer device detects the internal pressure p2 in the buffer cylinder, and the speed v2 and the internal pressure p2 are inputted to the acquisition processor; the acquisition processor automatically calculates optimal throttling area s2 for accomplishing current buffering and current throttling area s3 of the buffer device, automatically calculates a difference between the optimal throttling area s2 and current throttling area s3 of the buffer device, i.e., s2-s3, and then transmits the processed data to the controller; the controller outputs a control signal;
If s2>s3, i.e., the optimal throttling area desired for accomplishing the current buffering is greater than the current throttling area, the controller controls the step motor to drive a valve spool via a lead screw so that the valve spool moves linearly and the area of the throttling orifice covered by the valve spool is decreased to the optimal throttling area s2 for accomplishing the current buffering;
If s2<s3, i.e., the optimal throttling area desired for accomplishing the current buffering is smaller than the current throttling area, the controller controls the step motor to drive a valve spool via a lead screw so that the valve spool moves linearly and the area of the throttling orifice covered by the valve spool is increased to the optimal throttling area s2 for accomplishing the current buffering;
Since oil has to be replenished to the rod cavity when the piston of the buffer cylinder moves, a replenishing valve is provided; when the piston rod of the buffer cylinder moves quickly, the replenishing valve is opened to replenish oil to the rod cavity of the buffer cylinder.
Beneficial effects and advantages:
1. The buffer capacity varies with the impact load, and thereby efficient buffering is realized;
2. A closed-loop control system is employed to realize automatic regulation of buffer stroke and throttling area;
.5.
The specific steps are as follows:
The speed sensor detects the speed v2 of the current impact object, the pressure sensor in the buffer cavity of the buffer device detects the internal pressure p2 in the buffer cylinder, and the speed v2 and the internal pressure p2 are inputted to the acquisition processor; the acquisition processor automatically calculates optimal throttling area s2 for accomplishing current buffering and current throttling area s3 of the buffer device, automatically calculates a difference between the optimal throttling area s2 and current throttling area s3 of the buffer device, i.e., s2-s3, and then transmits the processed data to the controller; the controller outputs a control signal;
If s2>s3, i.e., the optimal throttling area desired for accomplishing the current buffering is greater than the current throttling area, the controller controls the step motor to drive a valve spool via a lead screw so that the valve spool moves linearly and the area of the throttling orifice covered by the valve spool is decreased to the optimal throttling area s2 for accomplishing the current buffering;
If s2<s3, i.e., the optimal throttling area desired for accomplishing the current buffering is smaller than the current throttling area, the controller controls the step motor to drive a valve spool via a lead screw so that the valve spool moves linearly and the area of the throttling orifice covered by the valve spool is increased to the optimal throttling area s2 for accomplishing the current buffering;
Since oil has to be replenished to the rod cavity when the piston of the buffer cylinder moves, a replenishing valve is provided; when the piston rod of the buffer cylinder moves quickly, the replenishing valve is opened to replenish oil to the rod cavity of the buffer cylinder.
Beneficial effects and advantages:
1. The buffer capacity varies with the impact load, and thereby efficient buffering is realized;
2. A closed-loop control system is employed to realize automatic regulation of buffer stroke and throttling area;
.5.
3. Buffering in a wide variation range of impact load is realized, and both low impact load and high impact load can be buffered;
4. Buffering against uncertain impact loads is realized by means of an automatic detection and control system;
5. A linear motor is employed to drive the linear cylinder to provide power for stroke adjustment, and thereby the size of the power source is decreased effectively.
IV. Brief Description of The Drawings Fig. 1 is a structural diagram of the buffer system in the present invention;
Fig. 2 is a structural diagram of the buffer cylinder in the present invention;
Fig. 3 is a structural diagram of the linear cylinder in the present invention.
In the figures: 1 - linear motor; 2 - linear cylinder; 3 - stroke control valve block; 4 - three-position two-way proportional valve of the rod cavity; 5 - three-position two-way proportional valve of the rod-less cavity; 6 - step motor; 7 - throttle control valve block; 8 -acquisition processor; 9 -controller; 10 - pressure sensor; 11 - buffer cylinder; 12 - support rod; 13 -buffer cylinder head;
14 - speed sensor; 15 - piston rod of the buffer cylinder; 16 - displacement sensor; 17 - rod cavity pipe of the buffer cylinder; 18 - oil tank; 19 - replenishing valve; 20 - rod-less cavity pipe of the buffer cylinder; 21 - oil return pipe; 22 - cylinder head of the linear cylinder; 23 - outer cylinder of the buffer cylinder; 24 - return spring; 25 - inner cylinder of the buffer cylinder; 26 - piston of the buffer cylinder; 27 - plug; 28 - throttling orifice; 29 coupling; 30 -screw rod; 31 - valve spool;
32 - reset piston of the buffer cylinder; 33 - piston of the linear cylinder;
34 - oil circuit of the stroke control valve block; 35 - piston rod of the linear cylinder; 36 - vent hole.
V. Detailed Description of Preferred Embodiments The present invention includes an intelligent feedback variable-throttle buffering system and a buffering method thereof.
The buffer system regulates the buffer capacity automatically within a wide range by means of closed-loop control with the speed sensor and pressure sensor. The specific structure comprises: a linear motor 1, a linear cylinder 2, a stroke control valve block 3, a step motor 6, a throttle control .6.
valve block 7, an acquisition processor 8, a controller 9, a pressure sensor 10, a buffer cylinder 11, a cylinder head 13 of the buffer cylinder, a speed sensor 14, and a displacement sensor 16.
One end of the linear cylinder 2 is connected to the linear motor 1, the other end of the linear cylinder 2 is connected to the stroke control valve block 3, and the stroke control valve block 3 is connected through a pipeline to the buffer cylinder 11; one end of the buffer cylinder 11 is connected to the throttle control valve block 7, and the other end of the buffer cylinder 11 is connected to the cylinder head 13 of the buffer cylinder; the speed sensor 14 and the displacement sensor 16 are connected on the cylinder head 13 of the buffer cylinder; the speed sensor 14 is mounted on the top of the buffer cylinder; the acquisition processor 8, the controller 9 and the pressure sensor 10 are connected on the throttle control valve block 7; the step motor 6 coaxial with the buffer cylinder 11 is connected on the throttle control valve block 7; the output end of the controller 9 is connected to the proportional control valves, the step motor, and the linear motor 1 respectively; the output ends of the pressure sensor 10, the speed sensor 13 and the displacement sensor 15 are connected to the input end of the acquisition processor 8, and the controller 9 controls the valves or motors respectively on the basis of the input signals of the acquisition processor 8.
The controller is a single-chip controller or PLC controller.
The buffer cylinder 11 comprises: a support rod 12, a piston rod 15 of the buffer cylinder, a rod cavity pipe 17 of the buffer cylinder, an oil tank 18, a replenishing valve 19, a rod-less cavity pipe 20 of the buffer cylinder, an oil return pipe 21, an outer cylinder 23 of the buffer cylinder, a return spring 24, an inner cylinder 25 of the buffer cylinder, a piston 26 of the buffer cylinder, and a reset piston 32 of the buffer cylinder.
The outer cylinder 23 of the buffer cylinder 11 is sleeved over the inner cylinder 25 of the buffer cylinder, the return spring 24, a screw rod 30, and the reset piston 32 of the buffer cylinder are disposed between the outer cylinder 23 of the buffer cylinder and the inner cylinder 25 of the buffer cylinder; the cylinder head 13 of the buffer cylinder is arranged on one end of the outer cylinder 23 of the buffer cylinder and the inner cylinder 25 of the buffer cylinder, and the support rod 12 connects the outer cylinder 23 of the buffer cylinder and the inner cylinder 25 of the buffer cylinder -7.
to the throttle control valve block 7 via the cylinder head 13 of the buffer cylinder; the piston 26 of the buffer cylinder is disposed in the inner cylinder 25 of the buffer cylinder, one end of the piston rod 15 of the buffer cylinder is connected to the piston 26 of the buffer cylinder, and the other end of the piston rod 15 of the buffer cylinder protrudes through the cylinder head 13 of the buffer cylinder; the oil tank 18 is disposed at a side of the outer cylinder 23 of the buffer cylinder, and the oil return pipe 21 is connected between the oil tank 18 and the stroke control valve block 3; the rod-less cavity pipe 20 of the buffer cylinder is connected between the stroke control valve block 3 and the throttle control valve block 7; the rod cavity pipe 17 of the buffer cylinder and the replenishing valve 19 are connected between the stroke control valve block 3 and the cylinder head 13 of the buffer cylinder.
The throttle control valve block 7 comprises: a plug 27, a throttling orifice 28, a coupling 29, a screw rod 30 and a valve spool 31.
The coupling 29, the screw rod 30, and the valve spool 31 are connected sequentially at the center of the end of the throttle control valve block 7 that is connected to the step motor 6; the plug 27 and the throttling orifice 28 are connected sequentially at the end of the throttle control valve block 7 that is connected to the buffer cylinder 11, one side of the throttling orifice communicates with a rod-less cavity of the buffer cylinder, and the other side of the throttling orifice communicates with a reset cavity of the buffer cylinder.
The plug isolates the external oil circuit of the valve block from the environment in the processing process to prevent oil leakage.
The linear cylinder 2 comprises: a three-position two-way proportional valve 4 of the rod cavity, a three-position two-way proportional valve 5 of the rod-less cavity, a cylinder head 22 of the linear cylinder, a piston 33 of the linear cylinder, an oil circuit 34 of the stroke control valve block, a piston rod 35 of the linear cylinder, and a vent hole 36.
The three-position two-way proportional valve 4 of the rod cavity and the three-position two-way proportional valve 5 of the rod-less cavity are connected on the stroke control valve block 3 connected to the linear cylinder 2; the oil circuit 34 of the stroke control valve block is disposed .8.
in the stroke control valve block 3; the cylinder head 22 of the linear cylinder is connected to the other end of the linear cylinder 2, and the cylinder head 22 of the linear cylinder is disposed between the linear cylinder 2 and the linear motor 1; the vent hole 36 is arranged on the cylinder head of the linear cylinder; the piston 33 of the linear cylinder is disposed in the linear cylinder 2, and the piston rod 35 of the linear cylinder is connected to the piston 33 of the linear cylinder, and the piston rod 35 of the linear cylinder is connected to the linear motor 1;
the oil circuit 34 of the stroke control valve block communicates with the oil tank 18, a rod cavity pipe 17 of the buffer cylinder, a rod-less cavity pipe 20 of the buffer cylinder, and the linear cylinder 2.
The speed sensor 14 is mounted on the top of the buffer cylinder. The buffering method is as follows:
(1) the speed sensor detects the speed of an impact object, and the buffer stroke and initial pressure are regulated in real time via the stroke control valve block;
(2) when the impact object comes into contact with the head of a piston rod, the speed sensor detects the speed of the impact object in real time, the pressure sensor detects the pressure in a buffer chamber in real time, a speed signal and a pressure signal are inputted to the acquisition processor, the acquisition processor performs conversion and calculation of the data, and transmits the processed data to the controller, the controller outputs a control signal, and controls the throttling area of a buffer device via the throttle control valve block.
The specific steps are as follows:
The speed sensor 14 on the top of the buffer cylinder detects the speed v2 of the current impact object, the pressure sensor 10 in the buffer chamber of the buffer device detects the internal pressure p2 in the buffer cylinder, and the speed v2 and the internal pressure p2 are inputted to the acquisition processor 8; the acquisition processor 8 automatically calculates optimal throttling area S2 for accomplishing current buffering and current throttling area s3 of the buffer device, automatically calculates a difference between the optimal throttling area S2 and current throttling area s3 of the buffer device, i.e., s2-s3, and then transmits the processed data to the controller 9; the controller 9 outputs a control signal.
-9.
If s2>53, i.e., the optimal throttling area desired for accomplishing the current buffering is greater than the current throttling area, the controller 9 controls the step motor 6 to drive the valve spool 31 via the screw rod 30 so that the valve spool 31 moves linearly and the area of the throttling orifice 28 covered by the valve spool is decreased to the optimal throttling area s2 for accomplishing the current buffering.
If s2<53, i.e., the optimal throttling area desired for accomplishing the current buffering is smaller than the current throttling area, the controller 9 controls the step motor 6 to drive the valve spool 31 via the screw rod 30 so that the valve spool 31 moves linearly and the area of the throttling orifice 28 covered by the valve spool is increased to the optimal throttling area S2 for accomplishing the current buffering.
Since oil has to be replenished to the rod cavity when the piston of the buffer cylinder 26 moves, the replenishing valve 19 is provided; when the piston rod 15 of the buffer cylinder moves quickly, the replenishing valve 19 is opened to replenish oil to the rod cavity of the buffer cylinder.
Embodiment 1 The speed sensor 14 on the top of the buffer cylinder detects the speed v2 of the current impact object, the pressure sensor 9 in the buffer chamber of the buffer device detects the internal pressure P2 in the buffer cylinder, and the speed V2 and the internal pressure p2 are inputted to the acquisition processor 8; the acquisition processor 8 automatically calculates optimal throttling area s2 for accomplishing current buffering and current throttling area s3 of the buffer device, automatically calculates a difference between the optimal throttling area s2 and current throttling area s3 of the buffer device, i.e., S2-S3;
if s2>s3, i.e., the optimal throttling area desired for accomplishing current buffering is greater than the current throttling area, the controller 9 controls the step motor 6 to drive the valve spool 31 via the screw rod 30, so that the valve spool 31 moves linearly, and the area of the throttling orifice 28 covered by the valve spool is decreased to the optimal throttling area S2 for accomplishing current buffering;
= 1 0.
if s2<s3, i.e., the optimal throttling area desired for accomplishing the current buffering is smaller than the current throttling area, the controller 9 controls the step motor 6 to drive the valve spool 31 via the screw rod 30 so that the valve spool 31 moves linearly and the area of the throttling orifice 28 covered by the valve spool is increased to the optimal throttling area s2 for accomplishing the current buffering.
Since oil has to be replenished to the rod cavity when the piston of the buffer cylinder 26 moves, the replenishing valve 19 is provided; when the piston rod 15 of the buffer cylinder moves quickly, the replenishing valve 19 is opened to replenish oil to the rod cavity of the buffer cylinder.
The specific operation process is as follows:
I. Regulation of buffer stroke The speed sensor 14 on the top of the buffer cylinder detects the speed of the impact object in real time, and transmits a speed signal to the acquisition processor 8; the acquisition processor 8 performs conversion and calculation of the speed signal, and transmits a calculation result to the controller 9; the controller 9 drives the linear motor 1, the linear motor 1 directly drives the piston of the linear cylinder 33 to move, and the linear cylinder 2 outputs hydraulic oil; the flow rate of the outputted hydraulic oil is regulated via the three-position two-way proportional valve of the rod-less cavity 5 and the three-position two-way proportional valve of the rod cavity 4, the flow rate of the hydraulic oil to the buffer cylinder 11 is regulated, and thereby the stroke of the buffer cylinder 11 is regulated. The specific regulation process is as follows: the speed sensor 14 detects the speed of the impact object, and transmits a speed signal to the acquisition processor 8; the acquisition processor 8 performs conversion and calculation of the speed signal, and transmits a calculation result to the controller 9; the controller 9 calculates a buffer stroke x required for accomplishing current buffering; the displacement sensor 15 on the top of the buffer cylinder detects the current stroke xi of the buffer device, and the acquisition processor 8 automatically calculates a difference between x and x 1, i.e., x-xi.
If x>xi, i.e., the stroke required for accomplishing current buffering is greater than the current stroke of the buffer device, the buffer stroke of the buffer cylinder 11 must be increased; in that =11=
case, the three-position two-way proportional valve 5 of the rod-less cavity connects hydraulic oil to the rod-less cavity pipe 20 of the buffer cylinder 11, the three-position two-way proportional valve 4 of the rod cavity connects the rod cavity pipe 17 of the buffer cylinder 11 to the oil tank 18; thus, the hydraulic oil pushes the piston rod 15 of the buffer cylinder outward, till the displacement sensor 16 detects a stroke x enough to accomplish current buffering; at that point, the controller 9 sends a signal to return the three-position two-way proportional valve 5 of the rod-less cavity and the three-position two-way proportional valve 4 of the rod cavity to a middle position respectively and stop the movement of the linear motor 1; thus, stroke regulation is accomplished.
If x<x , i.e., the stroke required for accomplishing current buffering is smaller than the current stroke of the buffer device, the buffer stroke of the buffer cylinder 11 must be decreased; in that case, the three-position two-way proportional valve 5 of the rod-less cavity connects hydraulic oil to oil tank 18, the three-position two-way proportional valve 4 of the rod cavity connects the rod cavity of the buffer cylinder 11 to the rod-less cavity of the buffer cylinder 11; thus, the hydraulic oil causes the piston rod 15 of the buffer cylinder to retract inward, till the displacement sensor 16 detects a stroke x enough to accomplish current buffering; at that point, the controller sends a signal to return the three-position two-way proportional valve 5 of the rod-less cavity and the three-position two-way proportional valve 4 of the rod cavity to a middle position respectively and stop the movement of the linear motor; thus, stroke regulation is accomplished; the median function of all control valves are of 0-type.
IL Setting of initial pressure The speed sensor 14 on the top of the buffer cylinder detects the speed of the impact object in real time, and transmits a speed signal to the acquisition processor 8; the acquisition processor 8 performs conversion and calculation of the speed signal, and transmits a calculation result to the controller 9; the controller 9 calculates an optimal initial pressure p desired for accomplishing current buffering according to the current speed of the impact object, the pressure sensor 10 in the buffer cylinder detects the current internal pressure pi in the buffer cylinder, and the acquisition = 12.
processor 8 automatically calculates a difference between p and pi, i.e., p-pi.
If p>pi, i.e., the optimal initial pressure p desired for accomplishing current buffering is greater than the current internal pressure pi in the buffer cylinder 11, the internal pressure in the buffer cylinder 11 must be increased so as to accomplish current buffering in the most effective way; in that case, the controller 9 controls the linear motor 1, the linear motor 1 directly drives the piston 33 of the linear cylinder to move, the linear cylinder 2 outputs hydraulic oil, the three-position two-way proportional valve 5 of the rod-less cavity connects the hydraulic oil, the three-position two-way proportional valve of the rod cavity 4 is in a middle position, and the hydraulic oil in the rod-less cavity of the buffer cylinder compresses the return spring 24, till the internal pressure sensor 10 of the buffer cylinder 11 detects that the internal pressure in the buffer cylinder 11 has reached the optimal initial pressure p desired for accomplishing current buffering; the controller 9 sends a signal to return the linear motor 1 and all control valves to their middle position.
If p<pi, i.e., the optimal initial pressure p desired for accomplishing current buffering is smaller than the current internal pressure pi in the buffer cylinder 11, the internal pressure in the buffer cylinder 11 must be decreased so as to accomplish current buffering in the most effective way; in that case, the controller 9 controls the linear motor 1, the linear motor 1 directly drives the piston 33 of the linear cylinder to move, the linear cylinder 2 sucks oil from the buffer cylinder, the three-position two-way proportional valve 5 of the rod-less cavity connects the linear cylinder, the three-position two-way proportional valve 4 of the rod cavity is in a middle position, and the hydraulic oil in the rod-less cavity of the buffer cylinder releases the return spring 24, till the internal pressure sensor 10 of the buffer cylinder 11 detects that the internal pressure in the buffer cylinder 11 has reached the optimal initial pressure p desired for accomplishing current buffering; the controller sends a signal to return the linear motor 1 and all control valves to their middle position.
= 13 III. Regulation of throttling area (1) The impact object has not come into contact with the piston rod of the buffer cylinder The speed sensor 14 on the top of the buffer cylinder detects the speed of the impact object in real time, and transmits a speed signal to the acquisition processor 8; the acquisition processor 8 performs conversion and calculation of the speed signal, and transmits a calculation result to the controller 9; the acquisition processor 8 calculates optimal throttling area s desired for accomplishing current buffering and the current throttling area Si of the buffer device, and automatically calculates a difference between the optimal throttling area s and the current throttling area Si of the buffer device, i.e., s-si; the controller 9 controls the step motor 6 to drives a valve spool 31 via the screw rod 30, so that the valve spool 31 moves linearly and thereby the area of the throttling orifice 28 reaches the optimal throttling area s for accomplishing current buffering, to avoid excessive regulation against instantaneous impacts.
If s>si, i.e., the optimal throttling area desired for accomplishing the current buffering is greater than the current throttling area, the controller 9 controls the step motor 6 to drive the valve spool 31 via the screw rod 30 so that the valve spool 31 moves linearly and the area of the throttling orifice 28 covered by the valve spool is decreased to the optimal throttling area s for accomplishing the current buffering.
If s<si, i.e., the optimal throttling area desired for accomplishing the current buffering is smaller than the current throttling area, the controller 9 controls the step motor 6 to drive the valve spool 31 via the screw rod 30 so that the valve spool 31 moves linearly and the area of the throttling orifice 28 covered by the valve spool is increased to the optimal throttling area s for accomplishing the current buffering.
(2) The impact object comes into contact with the piston rod of the buffer cylinder When the impact object comes into contact with the piston rod 15 of the buffer .14.
cylinder, the speed of the impact object and the pressure in the buffer chamber change continuously; in addition, the key factors that have influence on the buffering efficiency are the speed of the impact object and the pressure in the buffer chamber; the throttling surface is controlled by detecting the speed of the impact object and the pressure in the buffer chamber, and thereby the buffering efficiency of the buffer device is maximized.
= 15.
IV. Brief Description of The Drawings Fig. 1 is a structural diagram of the buffer system in the present invention;
Fig. 2 is a structural diagram of the buffer cylinder in the present invention;
Fig. 3 is a structural diagram of the linear cylinder in the present invention.
In the figures: 1 - linear motor; 2 - linear cylinder; 3 - stroke control valve block; 4 - three-position two-way proportional valve of the rod cavity; 5 - three-position two-way proportional valve of the rod-less cavity; 6 - step motor; 7 - throttle control valve block; 8 -acquisition processor; 9 -controller; 10 - pressure sensor; 11 - buffer cylinder; 12 - support rod; 13 -buffer cylinder head;
14 - speed sensor; 15 - piston rod of the buffer cylinder; 16 - displacement sensor; 17 - rod cavity pipe of the buffer cylinder; 18 - oil tank; 19 - replenishing valve; 20 - rod-less cavity pipe of the buffer cylinder; 21 - oil return pipe; 22 - cylinder head of the linear cylinder; 23 - outer cylinder of the buffer cylinder; 24 - return spring; 25 - inner cylinder of the buffer cylinder; 26 - piston of the buffer cylinder; 27 - plug; 28 - throttling orifice; 29 coupling; 30 -screw rod; 31 - valve spool;
32 - reset piston of the buffer cylinder; 33 - piston of the linear cylinder;
34 - oil circuit of the stroke control valve block; 35 - piston rod of the linear cylinder; 36 - vent hole.
V. Detailed Description of Preferred Embodiments The present invention includes an intelligent feedback variable-throttle buffering system and a buffering method thereof.
The buffer system regulates the buffer capacity automatically within a wide range by means of closed-loop control with the speed sensor and pressure sensor. The specific structure comprises: a linear motor 1, a linear cylinder 2, a stroke control valve block 3, a step motor 6, a throttle control .6.
valve block 7, an acquisition processor 8, a controller 9, a pressure sensor 10, a buffer cylinder 11, a cylinder head 13 of the buffer cylinder, a speed sensor 14, and a displacement sensor 16.
One end of the linear cylinder 2 is connected to the linear motor 1, the other end of the linear cylinder 2 is connected to the stroke control valve block 3, and the stroke control valve block 3 is connected through a pipeline to the buffer cylinder 11; one end of the buffer cylinder 11 is connected to the throttle control valve block 7, and the other end of the buffer cylinder 11 is connected to the cylinder head 13 of the buffer cylinder; the speed sensor 14 and the displacement sensor 16 are connected on the cylinder head 13 of the buffer cylinder; the speed sensor 14 is mounted on the top of the buffer cylinder; the acquisition processor 8, the controller 9 and the pressure sensor 10 are connected on the throttle control valve block 7; the step motor 6 coaxial with the buffer cylinder 11 is connected on the throttle control valve block 7; the output end of the controller 9 is connected to the proportional control valves, the step motor, and the linear motor 1 respectively; the output ends of the pressure sensor 10, the speed sensor 13 and the displacement sensor 15 are connected to the input end of the acquisition processor 8, and the controller 9 controls the valves or motors respectively on the basis of the input signals of the acquisition processor 8.
The controller is a single-chip controller or PLC controller.
The buffer cylinder 11 comprises: a support rod 12, a piston rod 15 of the buffer cylinder, a rod cavity pipe 17 of the buffer cylinder, an oil tank 18, a replenishing valve 19, a rod-less cavity pipe 20 of the buffer cylinder, an oil return pipe 21, an outer cylinder 23 of the buffer cylinder, a return spring 24, an inner cylinder 25 of the buffer cylinder, a piston 26 of the buffer cylinder, and a reset piston 32 of the buffer cylinder.
The outer cylinder 23 of the buffer cylinder 11 is sleeved over the inner cylinder 25 of the buffer cylinder, the return spring 24, a screw rod 30, and the reset piston 32 of the buffer cylinder are disposed between the outer cylinder 23 of the buffer cylinder and the inner cylinder 25 of the buffer cylinder; the cylinder head 13 of the buffer cylinder is arranged on one end of the outer cylinder 23 of the buffer cylinder and the inner cylinder 25 of the buffer cylinder, and the support rod 12 connects the outer cylinder 23 of the buffer cylinder and the inner cylinder 25 of the buffer cylinder -7.
to the throttle control valve block 7 via the cylinder head 13 of the buffer cylinder; the piston 26 of the buffer cylinder is disposed in the inner cylinder 25 of the buffer cylinder, one end of the piston rod 15 of the buffer cylinder is connected to the piston 26 of the buffer cylinder, and the other end of the piston rod 15 of the buffer cylinder protrudes through the cylinder head 13 of the buffer cylinder; the oil tank 18 is disposed at a side of the outer cylinder 23 of the buffer cylinder, and the oil return pipe 21 is connected between the oil tank 18 and the stroke control valve block 3; the rod-less cavity pipe 20 of the buffer cylinder is connected between the stroke control valve block 3 and the throttle control valve block 7; the rod cavity pipe 17 of the buffer cylinder and the replenishing valve 19 are connected between the stroke control valve block 3 and the cylinder head 13 of the buffer cylinder.
The throttle control valve block 7 comprises: a plug 27, a throttling orifice 28, a coupling 29, a screw rod 30 and a valve spool 31.
The coupling 29, the screw rod 30, and the valve spool 31 are connected sequentially at the center of the end of the throttle control valve block 7 that is connected to the step motor 6; the plug 27 and the throttling orifice 28 are connected sequentially at the end of the throttle control valve block 7 that is connected to the buffer cylinder 11, one side of the throttling orifice communicates with a rod-less cavity of the buffer cylinder, and the other side of the throttling orifice communicates with a reset cavity of the buffer cylinder.
The plug isolates the external oil circuit of the valve block from the environment in the processing process to prevent oil leakage.
The linear cylinder 2 comprises: a three-position two-way proportional valve 4 of the rod cavity, a three-position two-way proportional valve 5 of the rod-less cavity, a cylinder head 22 of the linear cylinder, a piston 33 of the linear cylinder, an oil circuit 34 of the stroke control valve block, a piston rod 35 of the linear cylinder, and a vent hole 36.
The three-position two-way proportional valve 4 of the rod cavity and the three-position two-way proportional valve 5 of the rod-less cavity are connected on the stroke control valve block 3 connected to the linear cylinder 2; the oil circuit 34 of the stroke control valve block is disposed .8.
in the stroke control valve block 3; the cylinder head 22 of the linear cylinder is connected to the other end of the linear cylinder 2, and the cylinder head 22 of the linear cylinder is disposed between the linear cylinder 2 and the linear motor 1; the vent hole 36 is arranged on the cylinder head of the linear cylinder; the piston 33 of the linear cylinder is disposed in the linear cylinder 2, and the piston rod 35 of the linear cylinder is connected to the piston 33 of the linear cylinder, and the piston rod 35 of the linear cylinder is connected to the linear motor 1;
the oil circuit 34 of the stroke control valve block communicates with the oil tank 18, a rod cavity pipe 17 of the buffer cylinder, a rod-less cavity pipe 20 of the buffer cylinder, and the linear cylinder 2.
The speed sensor 14 is mounted on the top of the buffer cylinder. The buffering method is as follows:
(1) the speed sensor detects the speed of an impact object, and the buffer stroke and initial pressure are regulated in real time via the stroke control valve block;
(2) when the impact object comes into contact with the head of a piston rod, the speed sensor detects the speed of the impact object in real time, the pressure sensor detects the pressure in a buffer chamber in real time, a speed signal and a pressure signal are inputted to the acquisition processor, the acquisition processor performs conversion and calculation of the data, and transmits the processed data to the controller, the controller outputs a control signal, and controls the throttling area of a buffer device via the throttle control valve block.
The specific steps are as follows:
The speed sensor 14 on the top of the buffer cylinder detects the speed v2 of the current impact object, the pressure sensor 10 in the buffer chamber of the buffer device detects the internal pressure p2 in the buffer cylinder, and the speed v2 and the internal pressure p2 are inputted to the acquisition processor 8; the acquisition processor 8 automatically calculates optimal throttling area S2 for accomplishing current buffering and current throttling area s3 of the buffer device, automatically calculates a difference between the optimal throttling area S2 and current throttling area s3 of the buffer device, i.e., s2-s3, and then transmits the processed data to the controller 9; the controller 9 outputs a control signal.
-9.
If s2>53, i.e., the optimal throttling area desired for accomplishing the current buffering is greater than the current throttling area, the controller 9 controls the step motor 6 to drive the valve spool 31 via the screw rod 30 so that the valve spool 31 moves linearly and the area of the throttling orifice 28 covered by the valve spool is decreased to the optimal throttling area s2 for accomplishing the current buffering.
If s2<53, i.e., the optimal throttling area desired for accomplishing the current buffering is smaller than the current throttling area, the controller 9 controls the step motor 6 to drive the valve spool 31 via the screw rod 30 so that the valve spool 31 moves linearly and the area of the throttling orifice 28 covered by the valve spool is increased to the optimal throttling area S2 for accomplishing the current buffering.
Since oil has to be replenished to the rod cavity when the piston of the buffer cylinder 26 moves, the replenishing valve 19 is provided; when the piston rod 15 of the buffer cylinder moves quickly, the replenishing valve 19 is opened to replenish oil to the rod cavity of the buffer cylinder.
Embodiment 1 The speed sensor 14 on the top of the buffer cylinder detects the speed v2 of the current impact object, the pressure sensor 9 in the buffer chamber of the buffer device detects the internal pressure P2 in the buffer cylinder, and the speed V2 and the internal pressure p2 are inputted to the acquisition processor 8; the acquisition processor 8 automatically calculates optimal throttling area s2 for accomplishing current buffering and current throttling area s3 of the buffer device, automatically calculates a difference between the optimal throttling area s2 and current throttling area s3 of the buffer device, i.e., S2-S3;
if s2>s3, i.e., the optimal throttling area desired for accomplishing current buffering is greater than the current throttling area, the controller 9 controls the step motor 6 to drive the valve spool 31 via the screw rod 30, so that the valve spool 31 moves linearly, and the area of the throttling orifice 28 covered by the valve spool is decreased to the optimal throttling area S2 for accomplishing current buffering;
= 1 0.
if s2<s3, i.e., the optimal throttling area desired for accomplishing the current buffering is smaller than the current throttling area, the controller 9 controls the step motor 6 to drive the valve spool 31 via the screw rod 30 so that the valve spool 31 moves linearly and the area of the throttling orifice 28 covered by the valve spool is increased to the optimal throttling area s2 for accomplishing the current buffering.
Since oil has to be replenished to the rod cavity when the piston of the buffer cylinder 26 moves, the replenishing valve 19 is provided; when the piston rod 15 of the buffer cylinder moves quickly, the replenishing valve 19 is opened to replenish oil to the rod cavity of the buffer cylinder.
The specific operation process is as follows:
I. Regulation of buffer stroke The speed sensor 14 on the top of the buffer cylinder detects the speed of the impact object in real time, and transmits a speed signal to the acquisition processor 8; the acquisition processor 8 performs conversion and calculation of the speed signal, and transmits a calculation result to the controller 9; the controller 9 drives the linear motor 1, the linear motor 1 directly drives the piston of the linear cylinder 33 to move, and the linear cylinder 2 outputs hydraulic oil; the flow rate of the outputted hydraulic oil is regulated via the three-position two-way proportional valve of the rod-less cavity 5 and the three-position two-way proportional valve of the rod cavity 4, the flow rate of the hydraulic oil to the buffer cylinder 11 is regulated, and thereby the stroke of the buffer cylinder 11 is regulated. The specific regulation process is as follows: the speed sensor 14 detects the speed of the impact object, and transmits a speed signal to the acquisition processor 8; the acquisition processor 8 performs conversion and calculation of the speed signal, and transmits a calculation result to the controller 9; the controller 9 calculates a buffer stroke x required for accomplishing current buffering; the displacement sensor 15 on the top of the buffer cylinder detects the current stroke xi of the buffer device, and the acquisition processor 8 automatically calculates a difference between x and x 1, i.e., x-xi.
If x>xi, i.e., the stroke required for accomplishing current buffering is greater than the current stroke of the buffer device, the buffer stroke of the buffer cylinder 11 must be increased; in that =11=
case, the three-position two-way proportional valve 5 of the rod-less cavity connects hydraulic oil to the rod-less cavity pipe 20 of the buffer cylinder 11, the three-position two-way proportional valve 4 of the rod cavity connects the rod cavity pipe 17 of the buffer cylinder 11 to the oil tank 18; thus, the hydraulic oil pushes the piston rod 15 of the buffer cylinder outward, till the displacement sensor 16 detects a stroke x enough to accomplish current buffering; at that point, the controller 9 sends a signal to return the three-position two-way proportional valve 5 of the rod-less cavity and the three-position two-way proportional valve 4 of the rod cavity to a middle position respectively and stop the movement of the linear motor 1; thus, stroke regulation is accomplished.
If x<x , i.e., the stroke required for accomplishing current buffering is smaller than the current stroke of the buffer device, the buffer stroke of the buffer cylinder 11 must be decreased; in that case, the three-position two-way proportional valve 5 of the rod-less cavity connects hydraulic oil to oil tank 18, the three-position two-way proportional valve 4 of the rod cavity connects the rod cavity of the buffer cylinder 11 to the rod-less cavity of the buffer cylinder 11; thus, the hydraulic oil causes the piston rod 15 of the buffer cylinder to retract inward, till the displacement sensor 16 detects a stroke x enough to accomplish current buffering; at that point, the controller sends a signal to return the three-position two-way proportional valve 5 of the rod-less cavity and the three-position two-way proportional valve 4 of the rod cavity to a middle position respectively and stop the movement of the linear motor; thus, stroke regulation is accomplished; the median function of all control valves are of 0-type.
IL Setting of initial pressure The speed sensor 14 on the top of the buffer cylinder detects the speed of the impact object in real time, and transmits a speed signal to the acquisition processor 8; the acquisition processor 8 performs conversion and calculation of the speed signal, and transmits a calculation result to the controller 9; the controller 9 calculates an optimal initial pressure p desired for accomplishing current buffering according to the current speed of the impact object, the pressure sensor 10 in the buffer cylinder detects the current internal pressure pi in the buffer cylinder, and the acquisition = 12.
processor 8 automatically calculates a difference between p and pi, i.e., p-pi.
If p>pi, i.e., the optimal initial pressure p desired for accomplishing current buffering is greater than the current internal pressure pi in the buffer cylinder 11, the internal pressure in the buffer cylinder 11 must be increased so as to accomplish current buffering in the most effective way; in that case, the controller 9 controls the linear motor 1, the linear motor 1 directly drives the piston 33 of the linear cylinder to move, the linear cylinder 2 outputs hydraulic oil, the three-position two-way proportional valve 5 of the rod-less cavity connects the hydraulic oil, the three-position two-way proportional valve of the rod cavity 4 is in a middle position, and the hydraulic oil in the rod-less cavity of the buffer cylinder compresses the return spring 24, till the internal pressure sensor 10 of the buffer cylinder 11 detects that the internal pressure in the buffer cylinder 11 has reached the optimal initial pressure p desired for accomplishing current buffering; the controller 9 sends a signal to return the linear motor 1 and all control valves to their middle position.
If p<pi, i.e., the optimal initial pressure p desired for accomplishing current buffering is smaller than the current internal pressure pi in the buffer cylinder 11, the internal pressure in the buffer cylinder 11 must be decreased so as to accomplish current buffering in the most effective way; in that case, the controller 9 controls the linear motor 1, the linear motor 1 directly drives the piston 33 of the linear cylinder to move, the linear cylinder 2 sucks oil from the buffer cylinder, the three-position two-way proportional valve 5 of the rod-less cavity connects the linear cylinder, the three-position two-way proportional valve 4 of the rod cavity is in a middle position, and the hydraulic oil in the rod-less cavity of the buffer cylinder releases the return spring 24, till the internal pressure sensor 10 of the buffer cylinder 11 detects that the internal pressure in the buffer cylinder 11 has reached the optimal initial pressure p desired for accomplishing current buffering; the controller sends a signal to return the linear motor 1 and all control valves to their middle position.
= 13 III. Regulation of throttling area (1) The impact object has not come into contact with the piston rod of the buffer cylinder The speed sensor 14 on the top of the buffer cylinder detects the speed of the impact object in real time, and transmits a speed signal to the acquisition processor 8; the acquisition processor 8 performs conversion and calculation of the speed signal, and transmits a calculation result to the controller 9; the acquisition processor 8 calculates optimal throttling area s desired for accomplishing current buffering and the current throttling area Si of the buffer device, and automatically calculates a difference between the optimal throttling area s and the current throttling area Si of the buffer device, i.e., s-si; the controller 9 controls the step motor 6 to drives a valve spool 31 via the screw rod 30, so that the valve spool 31 moves linearly and thereby the area of the throttling orifice 28 reaches the optimal throttling area s for accomplishing current buffering, to avoid excessive regulation against instantaneous impacts.
If s>si, i.e., the optimal throttling area desired for accomplishing the current buffering is greater than the current throttling area, the controller 9 controls the step motor 6 to drive the valve spool 31 via the screw rod 30 so that the valve spool 31 moves linearly and the area of the throttling orifice 28 covered by the valve spool is decreased to the optimal throttling area s for accomplishing the current buffering.
If s<si, i.e., the optimal throttling area desired for accomplishing the current buffering is smaller than the current throttling area, the controller 9 controls the step motor 6 to drive the valve spool 31 via the screw rod 30 so that the valve spool 31 moves linearly and the area of the throttling orifice 28 covered by the valve spool is increased to the optimal throttling area s for accomplishing the current buffering.
(2) The impact object comes into contact with the piston rod of the buffer cylinder When the impact object comes into contact with the piston rod 15 of the buffer .14.
cylinder, the speed of the impact object and the pressure in the buffer chamber change continuously; in addition, the key factors that have influence on the buffering efficiency are the speed of the impact object and the pressure in the buffer chamber; the throttling surface is controlled by detecting the speed of the impact object and the pressure in the buffer chamber, and thereby the buffering efficiency of the buffer device is maximized.
= 15.
Claims (6)
1. An intelligent feedback variable-throttle buffering system, characterized in that the buffering system comprises: a linear motor, a linear cylinder, a stroke control valve block, a step motor, a throttle control valve block, an acquisition processor, a controller, a pressure sensor, a buffer cylinder, a cylinder head of the buffer cylinder, a speed sensor, and a displacement sensor;
the buffer capacity is regulated automatically within a wide range by means of closed-loop control with the speed sensor and pressure sensor;
one end of the linear cylinder is connected to the linear motor, the other end of the linear cylinder is connected to the stroke control valve block, and the stroke control valve block is connected to the buffer cylinder through a pipeline;
one end of the buffer cylinder is connected to the throttle control valve block, and the other end of the buffer cylinder is connected to a cylinder head of the buffer cylinder;
the speed sensor and the displacement sensor are connected on the cylinder head of the buffer cylinder;
the acquisition processor, the controller and the pressure sensor are connected on the throttle control valve block;
the step motor coaxial with the buffer cylinder is connected on the throttle control valve block;
the output ends of the controller are connected to proportional control valves, the step motor, and the linear motor respectively;
the output ends of the pressure sensor, the speed sensor and the displacement sensor are connected to the input end of the acquisition processor, and the controller controls the valves or motors respectively on the basis of the input signals of the acquisition processor;
the controller is a single-chip controller or PLC controller.
the buffer capacity is regulated automatically within a wide range by means of closed-loop control with the speed sensor and pressure sensor;
one end of the linear cylinder is connected to the linear motor, the other end of the linear cylinder is connected to the stroke control valve block, and the stroke control valve block is connected to the buffer cylinder through a pipeline;
one end of the buffer cylinder is connected to the throttle control valve block, and the other end of the buffer cylinder is connected to a cylinder head of the buffer cylinder;
the speed sensor and the displacement sensor are connected on the cylinder head of the buffer cylinder;
the acquisition processor, the controller and the pressure sensor are connected on the throttle control valve block;
the step motor coaxial with the buffer cylinder is connected on the throttle control valve block;
the output ends of the controller are connected to proportional control valves, the step motor, and the linear motor respectively;
the output ends of the pressure sensor, the speed sensor and the displacement sensor are connected to the input end of the acquisition processor, and the controller controls the valves or motors respectively on the basis of the input signals of the acquisition processor;
the controller is a single-chip controller or PLC controller.
2. The intelligent feedback variable-throttle buffering system according to claim 1, wherein, the = 16.
buffer cylinder comprises: a support rod, a piston rod of the buffer cylinder, a rod cavity pipe of the buffer cylinder, an oil tank, a replenishing valve, a rod-less cavity pipe of the buffer cylinder, an oil return pipe, an outer cylinder of the buffer cylinder, a return spring, an inner cylinder of the buffer cylinder, a piston of the buffer cylinder, and a reset piston of the buffer cylinder;
the outer cylinder of the buffer cylinder is sleeved over the inner cylinder of the buffer cylinder, the return spring, a screw rod, and the reset piston of the buffer cylinder are disposed between the outer cylinder of the buffer cylinder and the inner cylinder of the buffer cylinder;
the cylinder head of the buffer cylinder is arranged on one end of the outer cylinder of the buffer cylinder and the inner cylinder of the buffer cylinder, and the support rod connects the outer cylinder of the buffer cylinder and the inner cylinder of the buffer cylinder to the throttle control valve block via the cylinder head of the buffer cylinder;
the piston of the buffer cylinder is disposed in the inner cylinder of the buffer cylinder, one end of the piston rod of the buffer cylinder is connected to the piston of the buffer cylinder, and the other end of the piston rod of the buffer cylinder protrudes through the cylinder head of the buffer cylinder;
the oil tank is disposed at a side of the outer cylinder of the buffer cylinder, and the oil return pipe is connected between the oil tank and the stroke control valve block;
the rod-less cavity pipe of the buffer cylinder is connected between the stroke control valve block and the throttle control valve block;
the rod cavity pipe of the buffer cylinder and the replenishing valve are connected between the stroke control valve block and the cylinder head of the buffer cylinder.
buffer cylinder comprises: a support rod, a piston rod of the buffer cylinder, a rod cavity pipe of the buffer cylinder, an oil tank, a replenishing valve, a rod-less cavity pipe of the buffer cylinder, an oil return pipe, an outer cylinder of the buffer cylinder, a return spring, an inner cylinder of the buffer cylinder, a piston of the buffer cylinder, and a reset piston of the buffer cylinder;
the outer cylinder of the buffer cylinder is sleeved over the inner cylinder of the buffer cylinder, the return spring, a screw rod, and the reset piston of the buffer cylinder are disposed between the outer cylinder of the buffer cylinder and the inner cylinder of the buffer cylinder;
the cylinder head of the buffer cylinder is arranged on one end of the outer cylinder of the buffer cylinder and the inner cylinder of the buffer cylinder, and the support rod connects the outer cylinder of the buffer cylinder and the inner cylinder of the buffer cylinder to the throttle control valve block via the cylinder head of the buffer cylinder;
the piston of the buffer cylinder is disposed in the inner cylinder of the buffer cylinder, one end of the piston rod of the buffer cylinder is connected to the piston of the buffer cylinder, and the other end of the piston rod of the buffer cylinder protrudes through the cylinder head of the buffer cylinder;
the oil tank is disposed at a side of the outer cylinder of the buffer cylinder, and the oil return pipe is connected between the oil tank and the stroke control valve block;
the rod-less cavity pipe of the buffer cylinder is connected between the stroke control valve block and the throttle control valve block;
the rod cavity pipe of the buffer cylinder and the replenishing valve are connected between the stroke control valve block and the cylinder head of the buffer cylinder.
3. The intelligent feedback variable-throttle buffering system according to claim 1, wherein, the throttle control valve block comprises: a plug, a throttling orifice, a coupling, a screw rod and a valve spool;
the coupling, the screw rod, and the valve spool are connected sequentially at the center of the end of the throttle control valve block that is connected to the step motor;
the plug and the throttling orifice are connected sequentially at the end of the throttle control valve block that is connected to the buffer cylinder, one side of the throttling orifice communicates with a rod-less cavity of the buffer cylinder, and the other side of the throttling orifice communicates with a reset cavity of the buffer cylinder.
the coupling, the screw rod, and the valve spool are connected sequentially at the center of the end of the throttle control valve block that is connected to the step motor;
the plug and the throttling orifice are connected sequentially at the end of the throttle control valve block that is connected to the buffer cylinder, one side of the throttling orifice communicates with a rod-less cavity of the buffer cylinder, and the other side of the throttling orifice communicates with a reset cavity of the buffer cylinder.
4. The intelligent feedback variable-throttle buffering system according to claim 1, wherein, the linear cylinder comprises: a cylinder head of the linear cylinder, a piston of the linear cylinder, an oil circuit of the stroke control valve block, a piston rod of the linear cylinder, and a vent ho le;
the oil circuit of the stroke control valve block is disposed in the stroke control valve block;
the cylinder head of the linear cylinder is connected to the other end of the linear cylinder, and the cylinder head of the linear cylinder is disposed between the linear cylinder and the linear motor;
the vent hole is arranged on the cylinder head of the linear cylinder;
the piston of the linear cylinder is disposed in the linear cylinder, and the piston rod of the linear cylinder is connected to the piston of the linear cylinder, the piston rod of the linear cylinder is connected to the linear motor;
the oil circuit of the stroke control valve block communicates with the oil tank, a rod cavity pipe of the buffer cylinder, a rod-less cavity pipe of the buffer cylinder, and the linear cylinder;
a three-position two-way proportional valve of the rod cavity pipe and a three-position two-way proportional valve of the rod-less cavity pipe are connected on the stroke control valve block connected to the linear cylinder.
the oil circuit of the stroke control valve block is disposed in the stroke control valve block;
the cylinder head of the linear cylinder is connected to the other end of the linear cylinder, and the cylinder head of the linear cylinder is disposed between the linear cylinder and the linear motor;
the vent hole is arranged on the cylinder head of the linear cylinder;
the piston of the linear cylinder is disposed in the linear cylinder, and the piston rod of the linear cylinder is connected to the piston of the linear cylinder, the piston rod of the linear cylinder is connected to the linear motor;
the oil circuit of the stroke control valve block communicates with the oil tank, a rod cavity pipe of the buffer cylinder, a rod-less cavity pipe of the buffer cylinder, and the linear cylinder;
a three-position two-way proportional valve of the rod cavity pipe and a three-position two-way proportional valve of the rod-less cavity pipe are connected on the stroke control valve block connected to the linear cylinder.
5. An intelligent feedback variable-throttle buffering method, wherein, a speed sensor is mounted on the top of a buffer cylinder, and the buffering method comprises:
(1) detecting the speed of an impact object by the speed sensor, and regulating the buffer stroke and initial pressure in real time via a stroke control valve block;
-18.
(2) when the impact object comes into contact with the head of a piston rod, detecting the speed of the impact object in real time by the speed sensor; detecting the pressure in a buffer chamber in real time by a pressure sensor; inputting measured speed signal and pressure signal to an acquisition processor; the acquisition processor performing conversion and calculation of the data, and transmitting the processed data to a controller; the controller outputting a control signal, and controlling the throttling area of a buffer device via a throttle control valve block.
(1) detecting the speed of an impact object by the speed sensor, and regulating the buffer stroke and initial pressure in real time via a stroke control valve block;
-18.
(2) when the impact object comes into contact with the head of a piston rod, detecting the speed of the impact object in real time by the speed sensor; detecting the pressure in a buffer chamber in real time by a pressure sensor; inputting measured speed signal and pressure signal to an acquisition processor; the acquisition processor performing conversion and calculation of the data, and transmitting the processed data to a controller; the controller outputting a control signal, and controlling the throttling area of a buffer device via a throttle control valve block.
6. The intelligent feedback variable-throttle buffering method according to claim 5, wherein, the speed sensor detects the speed v2 of the current impact object, the pressure sensor in the buffer chamber of the buffer device detects the internal pressure p2 in the buffer cylinder, and the speed V2 and the internal pressure p2 are inputted to the acquisition processor;
the acquisition processor automatically calculates optimal throttling area s2 for accomplishing current buffering and current throttling area s3, automatically calculates a difference, s2-s3, between the optimal throttling area S2 and current throttling area s3 of the buffer device, and then transmits the processed data to the controller;
the controller outputs a control signal;
if s2, the optimal throttling area desired for accomplishing the current buffering, is greater than s3, the current throttling area, the controller controls a step motor to drive a valve spool via a lead screw so that the valve spool moves linearly and the area of a throttling orifice covered by the valve spool is decreased to the optimal throttling area S2 for accomplishing the current buffering;
if s2, the optimal throttling area desired for accomplishing the current buffering, is smaller than s3, the current throttling area, the controller controls the step motor to drive the valve spool via the lead screw so that the valve spool moves linearly and the area of the throttling orifice covered by the valve spool is increased to the optimal throttling area s2 for accomplishing the current buffering;
-19.
a replenishing valve opens when the piston rod of the buffer cylinder moves quickly, to replenish oil to the buffer cylinder.
the acquisition processor automatically calculates optimal throttling area s2 for accomplishing current buffering and current throttling area s3, automatically calculates a difference, s2-s3, between the optimal throttling area S2 and current throttling area s3 of the buffer device, and then transmits the processed data to the controller;
the controller outputs a control signal;
if s2, the optimal throttling area desired for accomplishing the current buffering, is greater than s3, the current throttling area, the controller controls a step motor to drive a valve spool via a lead screw so that the valve spool moves linearly and the area of a throttling orifice covered by the valve spool is decreased to the optimal throttling area S2 for accomplishing the current buffering;
if s2, the optimal throttling area desired for accomplishing the current buffering, is smaller than s3, the current throttling area, the controller controls the step motor to drive the valve spool via the lead screw so that the valve spool moves linearly and the area of the throttling orifice covered by the valve spool is increased to the optimal throttling area s2 for accomplishing the current buffering;
-19.
a replenishing valve opens when the piston rod of the buffer cylinder moves quickly, to replenish oil to the buffer cylinder.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710119902.0 | 2017-03-01 | ||
| CN201710119902.0A CN106641074B (en) | 2017-03-01 | 2017-03-01 | A kind of intelligent feedback variable throttling buffer system and its way to play for time |
| PCT/CN2017/095573 WO2018157549A1 (en) | 2017-03-01 | 2017-08-02 | Intelligent feedback type variable throttle buffering system and method |
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| Publication Number | Publication Date |
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| CA3002263A1 CA3002263A1 (en) | 2018-09-01 |
| CA3002263C true CA3002263C (en) | 2020-04-28 |
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| CA3002263A Active CA3002263C (en) | 2017-03-01 | 2017-08-02 | Intelligent feedback variable-throttle buffering system and buffering method thereof |
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| CN109707784B (en) * | 2019-01-16 | 2024-02-23 | 大连富地重工机械制造有限公司 | Pneumatic buffering device and method |
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