CN103123042A - Variable air-capacitor device - Google Patents

Abstract

The invention discloses a variable gas capacity device, which comprises a cylinder, a cylinder fixing seat, a piston and a piston rod. The piston rod slides linearly to control the variable volume of the main working air chamber of the cylinder. The piston drive control device includes a stepping motor, a motor driver, a drive actuator, a real-time detection device for piston displacement and a main controller. The drive actuator is The screw mechanism, the stepper motor coaxially drives the screw rod, and the real-time detection device for piston displacement is a displacement sensor, which monitors the linear motion displacement change of the connecting slider in real time. The variable gas capacity device of the present invention can realize accurate and rapid adjustment of the volume, and is especially suitable for the situation where precise and variable gas capacity is required in the pneumatic test, greatly shortens the test time, improves the efficiency, and is safe and reliable.

Description

variable gas volume device

technical field

The invention relates to a volume-adjustable container, in particular to a container capable of accurately and rapidly adjusting the volume of the loaded gas.

Background technique

A gas container is a container for holding gas. Gas containers are often used as a basic component and are widely used in inflatable equipment. Existing gas containers include various pressure vessels, such as leather bags, gas storage cabinets, and gas storage boxes. Invention patent ZL96498551.8 discloses a gas storage and gas supply device, including a gas storage container with a gas supply port that can hold pressure gas, and the first end can be connected with the gas supply port to supply gas through the second end The gas supply device, and the control device that can control the gas supply speed, the gas container is an annular pressure vessel, which includes a metal annular shell, and the surface of the shell is wrapped with high tensile strength non-metallic fibers to withstand the tensile load layers, the fibers on the annular shell are substantially aligned along the meridional direction. Invention patent ZL96498551.8 discloses a gas storage container capable of holding pressurized gas. Its gas supply speed to the outside is controllable, but it cannot achieve controllable adjustment of the volume of the gas storage container.

Most of the gas volumes on the market today are fixed-volume gas volumes. With the development of industrial automation and testing technology, fixed gas volumes cannot meet the requirements under certain conditions. In pneumatic testing, the gas volume needs to be precisely variable, but it is usually achieved by frequent replacement of the gas volume. The test time is long, the efficiency is low, and the test accuracy is not ideal.

Contents of the invention

In order to solve the problems of the prior art, the object of the present invention is to overcome the deficiencies of the prior art, and provide a variable gas capacity device, which can withstand high pressure, and can realize precise and rapid adjustment of the volume, which is especially suitable for the precise gas capacity required in the pneumatic test. Variable conditions, the use of this device can avoid frequent replacement of the gas volume, thereby greatly shortening the test time, improving efficiency, and being safe and reliable.

In order to achieve the above invention creation purpose, the present invention adopts the following technical solutions:

A variable air capacity device, including a cylinder, a cylinder fixing seat, a piston and a piston rod. The cylinder is fixedly connected to the cylinder fixing seat through its cylinder wall. The power output end passes through the cylinder wall of the cylinder and is fixedly connected to the piston. The piston separates the cylinder cavity into the main working air chamber and the auxiliary working chamber. The main working air chamber is a chamber without a piston rod or with a piston. The chamber of the rod, the auxiliary working chamber is the chamber with the piston rod, the piston rod is driven by the piston drive control device to drive the piston to slide linearly in the cylinder chamber, and then the volume of the main working air chamber of the cylinder is controlled to be variable, the piston The drive control device includes a stepper motor, a motor driver, a drive actuator, a real-time detection device for piston displacement and a main controller. Connect the slider, the connecting slider is fixedly connected with the passive traction end of the piston rod, the screw rod of the screw mechanism is arranged parallel to the axial direction of the piston rod, the power output spindle of the stepping motor drives the screw rod coaxially, and the screw mechanism will step The rotary motion of the power output spindle of the motor is converted into the linear motion of the connecting slider, so that the connecting slider directly pulls the piston rod for linear motion. The positive and negative rotation of the stepping motor controls the moving direction of the connecting slider. The real-time detection device for piston displacement is Displacement sensor, the displacement sensor monitors the linear motion displacement change of the connected slider in real time, the signal output end of the displacement sensor is connected with the signal receiving end of the main controller, and the command signal sending end of the main controller is connected with the command signal receiving end of the motor driver Connected, the motor driver controls and drives the stepper motor to run, that is, drives the transmission spindle of the stepper motor to rotate the angle and direction of rotation, thereby driving the screw mechanism to make the piston rod and the inner volume of the main working gas chamber adjusted to the required volume.

The above-mentioned piston drive control device is preferably an external input and output device, that is, a display screen and a keyboard. connect.

The above-mentioned cylinder fixing seat preferably includes a fixed base, a front baffle and a rear baffle, the front baffle and the rear baffle are respectively fixedly connected and installed with the fixed base, and the front baffle and the rear baffle are clamped and fixed to the front and back of the cylinder, so that the cylinder It is fixedly installed on the cylinder fixing base.

The above-mentioned piston rod and the displacement sensor are preferably fixedly connected to the connecting slider through a screw mechanism respectively.

The above-mentioned main controller preferably adopts a single-chip microcomputer.

Compared with the prior art, the present invention has the following obvious outstanding substantive features and significant advantages:

1. The variable gas capacity device of the present invention can quickly and accurately adjust the volume, and can withstand high pressure, which can shorten the test cycle or production cycle in pneumatic testing or automatic production, reduce costs, and maximize profits;

2. The stepper motor and the displacement sensor of the variable gas capacity device of the present invention adopt a closed-loop control method, which improves the control accuracy, shortens the response time, and enhances the anti-interference ability;

3. The variable gas capacity device of the present invention can maintain high precision and high stability in a high-pressure gas environment;

4. The single-chip microcomputer, stepping motor, displacement sensor and other components of the variable gas capacity device of the present invention are low in cost, stable in performance, safe and reliable, and have better economic benefits than the servo valve system.

Description of drawings

FIG. 1 is a schematic structural diagram of a variable air capacity device according to an embodiment of the present invention.

FIG. 2 is a schematic diagram of the signal transmission relationship of a variable gas capacity device according to an embodiment of the present invention.

FIG. 3 is a control schematic diagram of a variable air capacity device according to an embodiment of the present invention.

FIG. 4 is a control flow diagram of a variable air capacity device according to an embodiment of the present invention.

Fig. 5 is a schematic diagram showing how the piston rod and the displacement sensor are respectively connected to the connecting slider according to the second embodiment of the present invention.

FIG. 6 is a schematic diagram of a test system for applying a variable gas capacity device in a cylinder leak test according to Embodiment 3 of the present invention.

Detailed ways

Preferred embodiments of the present invention are described in detail as follows:

Embodiment one:

Referring to Figures 1 to 4, the variable gas capacity device of this embodiment includes a cylinder 2, a cylinder holder, a piston 11 and a piston rod 4, the cylinder 2 is fixedly connected to the cylinder holder through its cylinder wall 3, and the two ends of the piston rod 4 are respectively It is the power output end and the passive traction end. The power output end of the piston rod 4 passes through the cylinder wall 3 of the cylinder 2 and is fixedly connected with the piston 11. The piston 11 separates the cavity of the cylinder 2 into the main working air chamber A and the auxiliary working chamber. Chamber B, the main working air chamber A is the chamber without piston rod 4 or the chamber with piston rod 4, the auxiliary working chamber B is the chamber with piston rod 4, and the piston rod is driven by the piston driving control device 4 Drive the piston 11 to slide linearly in the cavity of the cylinder 2, and then control the volume of the main working air chamber A of the cylinder 2 to be variable. The piston drive control device includes a stepping motor 9, a motor driver 13, a driving actuator, and real-time displacement of the piston. The detection device and the main controller 12, the stepping motor 9 are fixedly installed on the fixed seat of the cylinder, the driving actuator is a screw mechanism, the nut of the screw mechanism forms a connecting slider 6, and the passive traction between the connecting slider 6 and the piston rod 4 The ends are fixedly connected, the screw rod 7 of the screw mechanism is arranged axially parallel to the piston rod 4, the power output spindle of the stepping motor 9 is coaxially driven to the screw rod 7, and the screw mechanism controls the rotary motion of the power output spindle of the stepping motor 9 It is converted into the linear motion of the connecting slider 6, so that the connecting slider 6 directly pulls the piston rod 4 for linear motion, the positive and negative rotation of the stepping motor 9 controls the moving direction of the connecting slider 6, and the real-time detection device for piston displacement is a displacement sensor 8 , the displacement sensor 8 real-time monitors the linear motion displacement change of the connecting slide block 6, the signal output end of the displacement sensor 8 is connected with the signal receiving end of the master controller 12, the master controller 12 is a single-chip microcomputer, and the command signal of the master controller 12 is sent end is connected with the command signal receiving end of the motor driver 13, and the motor driver 13 controls and drives the stepper motor 9 to run, that is, the rotation angle and the direction of rotation of the transmission spindle of the stepper motor 9 are driven, thereby driving the screw mechanism to make the piston rod 4, so that The inner cavity volume of the main working gas chamber A is adjusted to the required volume. In this embodiment, referring to Figures 1 to 3, when the stepping motor 9 rotates, the screw rod 7 drives the connecting slider 6 to move, the connecting slider 6 drives the piston rod 4, and the movement of the piston 11 changes the main working air volume chamber. A volume, the displacement sensor 8 monitors the position of the connecting slider 6 . In this way, the position of the connecting slider 6 determines the volume of the main working air chamber A, and the movement of the connecting slider 6 is controlled by the stepping motor 9 , and the position of the connecting slider 6 is detected by the displacement sensor 8 . The realization method of the precise movement of the connecting slider 6 mainly utilizes the rotation control of the stepping motor 9 rotating shafts, and the connecting slider 6 can rotate a corresponding distance every time the transmission main shaft makes one revolution. The positive and negative rotation of the stepper motor 9 controls the direction in which the slide block moves. And stepper motor 9 rotation angle and direction of rotation are controlled by stepper motor driver, main controller 12 single-chip microcomputers send pulse signal and direction drive signal into motor driver, and motor driver controls stepper motor 9 to turn over corresponding angle according to direction instruction , so as to drive the ball screw 7 forward or backward to the target displacement, the main working air chamber A can be adjusted to the required volume, thus realizing the precise movement of the connecting slider 6 and the precise adjustment of the volume of the main working air chamber A .

In this embodiment, the pulse signal is mainly the given number of pulses, and this embodiment uses a single-chip microcomputer to send to the stepper motor driver. When the single-chip microcomputer corresponds the volume of the main working air chamber A to the corresponding position of the connecting slider 6 through processing, compare it with the position of the connecting slider 6 detected by the displacement sensor 8, and calculate the number of pulses to be sent. As shown in Figure 4, the single-chip microcomputer sends pulses according to the following steps: first set the low level at the I/O port of the single-chip microcomputer --- set the high level --- delay --- set the low level, and a pulse comes out; first Set the timer interrupt to determine when to send a pulse. For example, load a number, and the subtraction of this number will be interrupted when it is reduced to 0. A time is set, and the first one is executed at this time. At the same time, it is judged how many pulses are sent. When it reaches 0, it means that the number of sent pulses has been sent.

The variable air capacity device of this embodiment is from the structural principle that a stepper motor 9 pushes the piston rod 4 of the cylinder 2, so that the main working air capacity chamber A of the cylinder 2 becomes a variable volume air capacity, and the cylinder 2 A single-rod piston cylinder or a double-rod piston cylinder can be used. When the cylinder 2 adopts a single-rod piston cylinder, the main working air chamber A is a rodless chamber; when the cylinder 2 adopts a double-rod piston cylinder, the main working air chamber A is a rod chamber. The single-rod piston cylinder has a simple structure, forming a variable air capacity device with a compact structure. The displacement sensor 8 can quickly and accurately feed back the position of the piston rod 4. Therefore, the variable gas volume device in this embodiment can quickly calculate the volume of the main working gas volume chamber A to achieve the purpose of variable gas volume. The variable gas volume device in this embodiment can adjust the volume accurately and quickly, and can withstand high pressure, and can shorten the test cycle or production cycle in pneumatic testing or automatic production, thereby greatly shortening testing and production time, improving efficiency, and being safe and reliable.

In the present embodiment, referring to Fig. 2, the external input and output equipment of the piston drive control device, that is, the display screen 14 and the keyboard 15, the signal output end of the main controller 12 is connected with the signal receiving end of the display screen 14, and the main controller The input signal receiving end of 12 is connected with keyboard 15 input signal sending end. In this embodiment, the friendly human-computer interaction function is realized through the input and output devices. When the user inputs the designated air volume to the main controller 12 single-chip microcomputer through the keyboard 15, the single-chip microcomputer can process the data to realize the main working gas volume. The relevant information of the gas volume regulation of the chamber A is displayed on the display screen 14 .

In this embodiment, referring to Fig. 1, the cylinder fixing seat includes a fixed base 10, a front baffle 1 and a rear baffle 5, the front baffle 1 and the rear baffle 5 are respectively fixedly connected and installed with the fixed base 10, and the front baffle The plate 1 and the tailgate 5 clamp and fix the cylinder 2 front and back, so that the cylinder 2 is fixedly installed on the cylinder holder. Through the simple splint fixing structure, the cylinder 2 is firmly connected and installed with the cylinder fixing seat, so as to ensure the stable operation of the variable gas capacity device.

Embodiment two:

This embodiment is basically the same as Embodiment 1, especially in that:

In this embodiment, referring to FIG. 5 , the piston rod 4 and the displacement sensor 8 are respectively fixedly connected to the connecting slider 6 through the screw mechanism 16 , and the screw mechanism 16 is used for easy assembly and disassembly, easy assembly and manufacture, easy maintenance, and easy use.

Embodiment three:

This embodiment is basically the same as the previous embodiment, and the special features are:

In this embodiment, referring to Fig. 6, the variable gas capacity device is used in the leakage test of the cylinder. Since it is hoped that the compensation gas capacity and the reference gas capacity can be adjusted accurately and quickly in the test, so as to achieve the purpose of rapid testing, therefore The variable gas capacity device of the aforementioned embodiment can well achieve this effect. When the ordinary gas capacity is replaced by the variable gas capacity device of the aforementioned embodiment for testing, the test time can be greatly shortened and the test efficiency can be improved. In this embodiment, the single-chip microcomputer of the variable gas capacity device can not only control the volume of the gas capacity, but also control the solenoid valve through the relay, which can make the test items more integrated. The variable gas capacity device of this embodiment can adjust the volume accurately and quickly, and is especially suitable for the situation that the gas capacity needs to be precisely variable in the pneumatic test. The use of the device can avoid frequent replacement of the gas capacity, thereby greatly shortening the test time and improving the efficiency.

The embodiments of the present invention have been described above in conjunction with the accompanying drawings, but the present invention is not limited to the above-mentioned embodiments, and various changes can also be made according to the purpose of the invention of the present invention. The changes, modifications, substitutions, combinations, and simplifications should all be equivalent replacement methods, as long as they meet the purpose of the invention, and as long as they do not deviate from the technical principle and inventive concept of the variable gas capacity device of the present invention, they all belong to the scope of the present invention. protected range.

Claims (9)

1. variable air-capacitor device, comprise cylinder (2), the cylinder fixed base, piston (11) and piston rod (4), described cylinder (2) is fixedly connected with described cylinder fixed base by its cylinder wall (3), the two ends of described piston rod (4) are respectively clutch end and passive traction end, the cylinder wall (3) that the clutch end of described piston rod (4) passes described cylinder (2) is fixedly connected with described piston (11), it is characterized in that: described piston (11) makes described cylinder (2) cavity be separated into main work air-capacitor chamber (A) and back work chamber (B), described main work air-capacitor chamber (A) is for the chamber of piston-rodless (4) or the chamber of piston rod (4) is arranged, described back work chamber (B) is for there being the chamber of piston rod (4), order about described piston rod (4) by the piston actuated control gear and drive described piston (11) linear slide in described cylinder (2) cavity, and then control the variable volume of the main work air-capacitor chamber (A) of described cylinder (2), described piston actuated control gear comprises stepper motor (9), motor driver (13), drive actuator, piston displacement real-time detection apparatus and master controller (12), described stepper motor (9) is fixedly installed on described cylinder fixed base, described driving actuator is screw mechanism, the nut of described screw mechanism forms connection sliding block (6), described connection sliding block (6) is fixedly connected with the passive traction end of described piston rod (4), the screw mandrel of described screw mechanism (7) and described piston rod (4) parallel to an axis setting, the power output described screw mandrel of main shaft coaxial transmission (7) of described stepper motor (9), described screw mechanism changes into the straight line motion of described connection sliding block (6) with the rotatablely moving of main shaft of power output of described stepper motor (9), make described connection sliding block (6) directly draw described piston rod (4) and do straight line motion, the movement direction of described connection sliding block (6) is controlled in the clockwise and anticlockwise of described stepper motor (9), described piston displacement real-time detection apparatus is displacement transducer (8), the straight line motion change in displacement of the described connection sliding block of described displacement transducer (8) Real-Time Monitoring (6), the signal output part of described displacement transducer (8) is connected with the signal receiving end of described master controller (12), the command signal transmitting terminal of described master controller (12) is connected with the command signal receiving terminal of described motor driver (13), described motor driver (13) is controlled and is driven described stepper motor (9) running, namely drive transmission main shaft rotation angle and the sense of rotation of described stepper motor (9), thereby drive described screw mechanism and make piston rod (4), make the cavity volume of described main work air-capacitor chamber (A) adjust to desired volume.

2. variable air-capacitor device according to claim 1, it is characterized in that: described piston actuated control gear outreaches input-output equipment, be display screen (14) and keyboard (15), the signal output part of described master controller (12) is connected with the signal receiving end of described display screen (14), and the input signal receiving terminal of described master controller (12) is connected with described keyboard (15) input signal transmitting terminal.

3. variable air-capacitor device according to claim 1 and 2, it is characterized in that: described cylinder fixed base comprises fixed pedestal (10), front screen (1) and backboard (5), described front screen (1) is fixedly connected with installation with fixed pedestal (10) respectively with backboard (5), described front screen (1) and backboard (5) are fixedly clamped to before and after described cylinder (2), and described cylinder (2) is fixedly installed on described cylinder fixed base.

4. variable air-capacitor device according to claim 1 and 2, it is characterized in that: described piston rod (4) is fixedly connected with described connection sliding block (6) by thread mechanism (16) respectively with described displacement transducer (8).

5. variable air-capacitor device according to claim 3, it is characterized in that: described piston rod (4) is fixedly connected with described connection sliding block (6) by thread mechanism (16) respectively with described displacement transducer (8).

6. variable air-capacitor device according to claim 1 and 2, it is characterized in that: described master controller (12) is single-chip microcomputer.

7. variable air-capacitor device according to claim 3, it is characterized in that: described master controller (12) is single-chip microcomputer.

8. variable air-capacitor device according to claim 4, it is characterized in that: described master controller (12) is single-chip microcomputer.

9. variable air-capacitor device according to claim 5, it is characterized in that: described master controller (12) is single-chip microcomputer.

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