CN211639182U - Positioning system of cylinder linear positioner - Google Patents
Positioning system of cylinder linear positioner Download PDFInfo
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- CN211639182U CN211639182U CN202020155605.9U CN202020155605U CN211639182U CN 211639182 U CN211639182 U CN 211639182U CN 202020155605 U CN202020155605 U CN 202020155605U CN 211639182 U CN211639182 U CN 211639182U
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Abstract
The utility model discloses a cylinder linear locator positioning system relates to cylinder location technical field, include: the small sliding table feeding and clamping device, the clamping and loosening stroke potentiometer, the lifting stroke potentiometer and the control subsystem; the clamping and loosening stroke potentiometer is arranged on a displacement potentiometer fixing support of a clamping plate on a sliding table of the small sliding table feeding and clamping device; the lifting stroke potentiometer is arranged on a lifting stroke potentiometer fixing plate of the small sliding table feeding clamping device; the lifting stroke potentiometer fixing plate is arranged on a support block on the side of the blanking sliding table; the lifting stroke potentiometer is used for detecting the information of the upper limit position of the material clamping lower module; the control subsystem is respectively connected with the clamping and loosening stroke potentiometer and the lifting stroke potentiometer; and the control subsystem is used for controlling the material clamping cylinder and the lower pressing block lifting cylinder according to the position information detected by the clamping and loosening stroke potentiometer and the lifting stroke potentiometer. The utility model provides a system can realize the real time monitoring to pressing from both sides the module position.
Description
Technical Field
The utility model relates to a cylinder location technical field especially relates to a cylinder linear locator positioning system.
Background
The existing cylinder judges that built-in-place signals are all travel switches, and the travel switches have the defects of narrow position range judgment, low repeated position precision, frequent change of cylinder stroke, inconvenience in adjustment of the travel switches and easiness in damage.
The following technical problems also exist in the prior art:
1. the magnetic switch of the common cylinder has a wide detection position range, and can not meet the requirement of accurate position detection.
2. The magnetic switch has only one switching function, and the position value cannot be clarified.
3. The cylinder capable of accurately detecting the position is high in price and less in applicable places.
4. Ordinary magnetism is opened and is installed at cylinder outer wall, generally is fixed through less screw, detects the screw of can frequent twisting when using the different strokes of cylinder, and is inconvenient, and little screw can damage moreover.
The clamping mechanism on the automatic blanking machine has the following conditions in the process of clamping materials:
1. the clamping mechanism does not clamp something.
2. The clamped material and the set material are not in the same specification, and the telescopic stroke of the air cylinder is not changed much.
3. When the clamping mechanism clamps the material, small foreign matters exist between the clamp and the material.
4. Whether the stroke of the cylinder between the in-position and the out-of-position material clamping is very small or not can not be distinguished by a normal stroke switch.
5. When no material exists in the equipment, the clamping mechanism does not clamp the material.
6. Different materials are frequently replaced, the clamping stroke of the air cylinder is changed and is frequently adjusted.
The above situations cause that the common travel switch cannot meet the existing requirements, but the existing numerical control equipment tends to be intelligent, and a lot of feedback information is needed to achieve mechanical intelligence.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a cylinder straight line locator positioning system to the real time monitoring to the module position that presss from both sides is realized.
In order to achieve the above object, the utility model provides a following scheme:
a cylinder linear positioner positioning system comprising: the small sliding table feeding and clamping device, the clamping and loosening stroke potentiometer, the lifting stroke potentiometer and the control subsystem;
the clamping and loosening stroke potentiometer is arranged on a displacement potentiometer fixing support of a clamping plate on a sliding table of the small sliding table feeding and clamping device; the clamping and loosening stroke potentiometer is used for detecting the information of the upper limit position of the clamping upper module and the information of the in-place position of the lower pressing of the clamping upper module; the lifting stroke potentiometer is arranged on a lifting stroke potentiometer fixing plate of the small sliding table feeding clamping device; the lifting stroke potentiometer fixing plate is arranged on a support block on one side of the blanking sliding table; the lifting stroke potentiometer is used for detecting the information of the upper limit position of the material clamping lower module;
the control subsystem is respectively connected with the clamping and loosening stroke potentiometer and the lifting stroke potentiometer; and the control subsystem is used for controlling the material clamping cylinder and the lower pressing block lifting cylinder according to the position information detected by the clamping and loosening stroke potentiometer and the lifting stroke potentiometer.
Optionally, the clamping release stroke potentiometer and the lifting stroke potentiometer are both linear potentiometers.
Optionally, the cylinder linear positioner positioning system further comprises a human-computer interface touch screen, and the human-computer interface touch screen is connected with the control subsystem; the human-computer interface touch screen is used for displaying position information detected by the clamping and loosening stroke potentiometer and the lifting stroke potentiometer.
Optionally, the cylinder linear positioner positioning system further comprises an output alarm device; and the output alarm device is connected with the control subsystem.
Optionally, the cylinder linear positioner positioning system further comprises an electromagnetic valve; one end of the electromagnetic valve is connected with the control subsystem, and the other end of the electromagnetic valve is connected with the air cylinder; the control subsystem controls the work of the air cylinder through the electromagnetic valve.
Optionally, the control subsystem includes:
the PLC analog input module is used for acquiring position information detected by the clamping and loosening stroke potentiometer and the lifting stroke potentiometer;
the PLC analog quantity internal processing module is used for processing the position information detected by the clamping and loosening stroke potentiometer and the lifting stroke potentiometer, which is acquired by the PLC analog quantity input module;
and the PLC output terminal is used for transmitting the processing result of the PLC analog quantity internal processing module.
According to the utility model provides a concrete embodiment, the utility model discloses a following technological effect:
the utility model provides a cylinder straight line locator positioning system presss from both sides tightly through setting up and looses the position information that the stroke potentiometre was pressed from both sides the module with the real-time acquisition of promotion stroke potentiometre, judges the position of pressing from both sides the module through the control subsystem to confirm the problem that automatic unloader appears.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive labor.
Fig. 1 is a schematic view of a positioning system of a linear positioner of an air cylinder according to an embodiment of the present invention;
fig. 2 is a first front view of a feeding and clamping device of a small sliding table of a positioning system of a linear positioner of an air cylinder according to an embodiment of the present invention;
fig. 3 is a second front view of a feeding and clamping device of a small sliding table of a positioning system of a cylinder linear positioner according to an embodiment of the present invention;
fig. 4 is a side view of a small sliding table feeding and clamping device of a positioning system of a cylinder linear positioner according to an embodiment of the present invention;
fig. 5 is a perspective view of a small sliding table feeding and clamping device of the positioning system of the cylinder linear positioner according to the embodiment of the present invention;
fig. 6 is an exploded view of a small sliding table feeding and clamping device of a positioning system of a cylinder linear positioner according to an embodiment of the present invention;
fig. 7 is an electrical schematic diagram of a linear potentiometer of the positioning system of the cylinder linear positioner according to the embodiment of the present invention;
fig. 8 is a schematic view of an upper limit position of the clamping module of the positioning system of the linear positioner of the air cylinder according to the embodiment of the present invention.
Description of the symbols:
1-a clamping plate cylinder fixing plate is arranged on a sliding table; 2-a material clamping cylinder; 3-pressing the block to lift the air cylinder; 4-clamping and unclamping stroke potentiometer; 6-a sliding table lower clamping plate cylinder fixing plate; 8-a guide post; 9-supporting a clamping plate on the blanking sliding table; 10-lifting stroke potentiometer fixing plate; 12-lifting a stroke potentiometer; 13-a sliding table lower clamping plate displacement potentiometer connecting block; 17-supporting a lower clamping plate of the blanking sliding table; 20-supporting a blanking sliding table bottom plate; 21-a guide rail slide block; 22-material clamping and feeding module; 23-clamping a material lower module; 24-a clamping plate displacement potentiometer fixing bracket on the sliding table; 26-clamping the die to connect the limit bolt; 27-human-machine interface touch screen; 28-PLC; 29-a first power line; 30-an output line; 31-second power line.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
The utility model aims at providing a cylinder straight line locator positioning system to the real time monitoring to the module position that presss from both sides is realized.
In order to make the above objects, features and advantages of the present invention more comprehensible, the present invention is described in detail with reference to the accompanying drawings and the detailed description.
Example one
As shown in fig. 1, the utility model provides a cylinder linear positioner positioning system, include: a small sliding table feeding and clamping device, a clamping and loosening stroke potentiometer 4, a lifting stroke potentiometer 12 and a control subsystem shown in figures 2-6.
The clamping and loosening stroke potentiometer 4 is arranged on a displacement potentiometer fixing support 24 of a clamping plate on a sliding table of the small sliding table feeding and clamping device; the clamping and loosening stroke potentiometer 4 is used for detecting the information of the upper limit position of the clamping and feeding module 22 and the information of the lower pressing and feeding position of the clamping and feeding module 22; the lifting stroke potentiometer 12 is arranged on a lifting stroke potentiometer fixing plate 11 of the small sliding table feeding clamping device; the lifting stroke potentiometer fixing plate 11 is arranged on the support block 10 on the side of the blanking sliding table; the lifting stroke potentiometer 12 is used for detecting the information of the upper limit position of the material clamping lower module 23.
The control subsystem is respectively connected with the clamping and loosening stroke potentiometer 4 and the lifting stroke potentiometer 12; the control subsystem is used for controlling the clamping cylinder 2 and the lower pressing block lifting cylinder 3 according to the position information detected by the clamping and loosening stroke potentiometer 4 and the lifting stroke potentiometer 12.
Preferably, the cylinder linear positioner positioning system further comprises an electromagnetic valve; one end of the electromagnetic valve is connected with the control subsystem, and the other end of the electromagnetic valve is connected with the air cylinder; the control subsystem controls the work of the air cylinder through the electromagnetic valve. Wherein, press from both sides material cylinder 2 and push down briquetting lift cylinder 3 and be connected with control subsystem through the solenoid valve respectively.
Additionally, the control subsystem includes: the PLC analog input module is used for acquiring position information detected by the clamping and loosening stroke potentiometer and the lifting stroke potentiometer; the PLC analog quantity internal processing module is used for processing the position information detected by the clamping and loosening stroke potentiometer and the lifting stroke potentiometer, which is acquired by the PLC analog quantity input module; and the PLC output terminal is used for transmitting the processing result of the PLC analog quantity internal processing module. The control subsystem specifically comprises a PLC28 system. Specifically, the PLC system comprises a PLC analog quantity input and output module, a PLC analog quantity internal processing module and a PLC output terminal. The analog input module can be divided into a PLC built-in analog input module and a PLC external analog input module. In this embodiment, an external analog input module of the PLC is taken as an example.
Furthermore, the clamping release stroke volume 4 and the lifting stroke volume 12 are both linear volumes. The linear potentiometer is connected to a power supply via a first power line 29 and a second power line 31. The linear potentiometer is connected to the control subsystem via output line 30. A0-10V analog quantity signal is output through a setting module of the linear potentiometer, the analog quantity signal is processed into a digital signal by a PLC28 (programmable logic controller) of the upper computer, and the digital signal, namely position data information, is displayed in real time through a connected human-computer interface touch screen 27.
In the clamping and loosening stroke potentiometer 4 and the lifting stroke potentiometer 12, all sensors are of an absolute position measurement type and are used in an adjusting system and a measuring system to directly measure displacement and length and output direct current voltage signals, and the signals can be converted into standard 0-5V, 0-10V or 4-20mA direct current signals through a built-in or position V/I conversion module, so that the requirement of remote transmission control can be met.
The potentiometer principle is shown in fig. 7, with 0-100% given input voltage (varying with displacement).
The potentiometer product has the following characteristics:
the service life is very long, and the operation times are more than 100 × 106Next, the process is carried out.
The running distance is more than 25 × 106And (4) rice.
And the noiseless output is smooth.
Excellent linearity, linearity error accuracy: and part of models are better than +/-0.04% FS.
Resolution is lower than 0.01mm, resolution: and (5) analyzing without interruption.
High running speed, maximum running speed: 10m/s, maximum running acceleration 10m/s2。
The repetition precision is high and is less than 0.01 mm.
Impact coefficient: and the IEC 68-2-29:196850 g.
Vibration coefficient: and the IEC 68-2-6:198220 g.
Maximum allowable voltage: DC60V/5K omega-20K omega, DC36V/2K omega-4K omega or DC24V/1K omega.
Almost no temperature drift exists between the normal temperature of minus 60 ℃ and plus 150 ℃, and the temperature drift coefficient is as follows when the temperature exceeds the normal temperature range: < 1.5 ppm/. degree.C.
All sensor housings: the surface of the anodic aluminum alloy is subjected to electrophoresis antistatic and radiation treatment, and the high-wear-resistance engineering slip ring ensures smooth operation.
All adopt high sealed protection level, pull rod formula: IP67, slider IP 57.
The conductive materials in the sensor are high-grade imported raw materials, so that the high wear resistance and stability of the sensor are ensured, and the sensor can reliably work even under the worst condition.
The principle of the actual internal structure of the linear potentiometer is similar to that of a sliding rheostat, the size of an output variable analog voltage value corresponding to the telescopic full stroke is limited to be 0-10V of direct current, and the variable analog voltage value is connected to a Mitsubishi FX5U series FX5-4AD-ADP analog input module through an output line, wherein the FX5-4AD-ADP analog input module is a PLC external analog input module. The analog quantity internal processing module of the PLC28 is used for converting the analog quantity signal into a digital quantity signal with a certain proportion, the proportion of the digital quantity signal is set by the FX5-4AD-ADP analog quantity internal processing module, the changed digital quantity signal is input and processed by the scanning of the CPU of the PLC28, the changed digital quantity signal is used as an input condition in a user program for judgment, a result is output after a period, external equipment such as an electromagnetic valve is driven on an output terminal of the PLC28 through a corresponding address, the electromagnetic valve is used for enabling an air cylinder to work, the position of the air cylinder captured by high frequency is mainly compared in the user program, the resolution ratio of the position is very high, the system provided by the utility model cannot use a feedback position as the basis of the expansion length of the air cylinder in practical application, is not limited by the extremely short stroke of the expansion of the air cylinder, and is not influenced by the change of the height of the clamped material, the telescopic stroke position of the cylinder can be recorded in real time.
Preferably, the cylinder linear positioner positioning system further comprises a human-computer interface touch screen 27, and the human-computer interface touch screen 27 is connected with the control subsystem; the human-computer interface touch screen 27 is used for displaying the position information detected by the clamping and loosening stroke potentiometer 4 and the lifting stroke potentiometer 12. Wherein, human-computer interface touch-control screen 27 can also show the trouble suggestion, and the trouble suggestion is first problem, second problem, presss from both sides module group connection limit bolt and damages, the mechanical card problem that pauses appears, confirms to hold in the palm the blanking slip table lower clamp movable block and hold in the palm there is the foreign matter between blanking slip table side supporting block 10 or confirms to hold in the palm there is the foreign matter between blanking slip table lower clamp movable block and the guide rail slider 21.
In order to better accord with practical application, the positioning system of the cylinder linear positioner also comprises an output alarm device; the output alarm device is connected with the control subsystem. The output alarm device gives an alarm when the small sliding table feeding and clamping device has a problem.
The automatic blanking machine equipment is provided with three groups of small sliding table feeding clamping devices, the clamping mode adopts a mode of lifting and pressing upwards, two cylinders with the diameter of 80mm are used for lifting upwards, one cylinder with the diameter of 80mm is used for pressing downwards, the three groups of small sliding table feeding clamping devices have the same structure, when the materials to be cut in the middle clamping die are clamped, the cylinder stretches out to generate the actions of lifting downwards and pressing upwards, when the materials to be cut are clamped in place, the lifting downwards and the pressing upwards have stop positions, the stop positions are different due to the difference of the sizes of the materials, the clamping signals are determined through linear potentiometers, six linear potentiometers are arranged between a cylinder fixing plate and a cylinder telescopic connecting plate, wherein, the cylinder fixed plate includes clamp movable plate cylinder fixed plate 1 on the slip table and clamp movable plate cylinder fixed plate 6 under the slip table, and cylinder expansion joint board is including holding in the palm clamp movable plate 9 on the blanking slip table and clamp movable plate displacement potentiometre connecting block 13 under the slip table. The feedback mode does not need manual regulation, whether the action of lifting and pressing the air cylinder in place or not can be judged by the instant output analog signal of the potentiometer, whether the position of the material is correct or not is judged, the repeated positioning precision of the linear potentiometer is very high, the actual use can be completely met, the analog electric signal of the potentiometer is transmitted to a PLC analog input module of an upper computer through a wire harness, the digital electric signal is converted into a digital signal through analog-digital conversion inside a PLC analog internal processing module and is transmitted to a CPU input side built in a PLC28, comparison judgment and output are carried out through an internal program, the position information detected by the linear potentiometer is used as final position information by the feeding clamping mechanism, and ventilation control is not carried out on the air cylinder according to the position information fed back by the linear potentiometer.
The utility model discloses a cylinder straight line potentiometre positioning system, including setting up PLC analog input module promptly at feeding fixture's analog signal collection system, signal processing arithmetic device promptly PLC analog internal processing module promptly, position numerical display device promptly man-machine interface touch screen, output alarm device. The utility model discloses a system mainly be to use all kinds of defects of electric jar (electric actuator) on the existing market, replace the cylinder with the electric jar, the advantage of system lies in that the input cost is lower in practical application, does not need the feeding fixture that positioning accuracy is high. The system has the advantages that whether the feeding clamping mechanism is in place or not can be accurately judged in a small stroke range, and the system is also suitable for the condition that the positioning position of the feeding clamping mechanism is frequently adjusted.
Example two
Utilize the system that embodiment one provided, mechanical mechanism cooperation through little slip table pay-off clamping device, hold in the palm blanking slip table that the cylinder is connected and go up clamping block 9, hold in the palm during the PLC analog input module of the up-and-down motion analog position information input of blanking slip table lower clamping plate 17, carry out signal processing, change digital signal into, user program in the PLC of offering uses as the condition, wherein, hold in the palm blanking slip table and go up clamping block 9 and be connected fixedly with the cylinder telescopic link, hold in the palm blanking slip table and go up clamping block 9 and be connected fixedly with sharp potentiometre telescopic link, the cylinder passes through slip table and presss from both sides movable plate cylinder fixed plate 1 fixedly, sharp potentiometre is indirectly through slip table on clamping plate cylinder fixed plate 1 fixed promptly, the cylinder is flexible will drive the flexible analog signal that produces the change of sharp potentiometre then. Therefore, the position information of the upper holding and blanking sliding table clamping block 9 and the lower holding and blanking sliding table clamping plate 17 is the position information detected by the two linear potentiometers. After the material clamping upper module 22 and the material clamping lower module 23 are respectively connected with the material supporting sliding table upper clamping block 9 and the material supporting sliding table lower clamping plate 17, debugging work before operation is carried out.
For example, taking the material a to be sawn as an example, the preparation work before the sawing process is to read the position information of the clamping and unclamping stroke potentiometer 4 when the special clamping die of the material a, namely the clamping and feeding module 22, is in the working state.
When the special clamping module for the material A, namely the clamping upper module 22 and the clamping lower module 23, is not installed, the clamping block 9 on the material-supporting sliding table rises to the uppermost end along with the retraction of the clamping cylinder 2, and is an upper limit position at the moment, the upper limit position at the moment is defined as a relative zero position, and the extending direction of the lower cylinder rod is a positive direction. The upper limit position is shown in fig. 8.
When the special clamping module for the material A, namely the clamping upper module 22 and the clamping lower module 23, is installed, the following operations are carried out:
the reading process of the preset extreme position 1 (hereinafter abbreviated as "position 1") on the material clamping and loading module 22 is as follows:
the clamping material feeding module 22 can move up and down along with the clamping block 9 on the material supporting sliding table, when the highest point is reached, namely the cylinder rod of the clamping material cylinder 2 is shortened to the shortest point, enough cylinder movement time is set (assuming 5 seconds, the time for a cylinder which normally has no mechanical clamping and stops to move 100mm in actual work can be far shorter than 5 seconds, and the purpose is to enable the cylinder to have enough time to reach the top dead center), and the control subsystem reads the upper limit position 1 of the clamping material feeding module 22 and stores the time for standby.
The preset reading process of the material clamping and feeding module 22 for pressing to the position 2 (hereinafter abbreviated as "position 2") is as follows:
then, a material A is placed between the material clamping upper module 22 and the material clamping lower module 23, the material clamping cylinder 2 is ventilated, a cylinder rod of the material clamping cylinder 2 extends out to drive the material supporting sliding table upper clamping block 9 and the material clamping upper module 22 to move downwards along the guide post 8 at the same time, the material A is clamped, at the moment, a cylinder movement time is set, and when the time is over, the control subsystem reads the material pressing position 2 of the material clamping upper module 22 and stores the material pressing position for later use.
Because the clamping upper module 22 and the clamping lower module 23 are connected by the clamping connecting limiting bolt 26 and the distance between the clamping upper module 22 and the clamping lower module 23 is limited, because each material has a special clamping module, namely the clamping upper module 22 and the clamping lower module 23, the height of each material is different, and the position 1 when the clamping module is not installed, namely the clamping upper module 22 and the clamping lower module 23, is defined as a relative zero position.
Another preparation before the sawing process is to read the position information of the lift stroke potentiometer 12 when another special clamping die of the material a, namely the clamping material lower module 23, is in a working state, specifically:
the reading process of the upper limit position 3 (hereinafter abbreviated as "position 3") of the preset material clamping lower module 23 is as follows:
the clamping material lower module 23 can move up and down along with the lower clamping block 17 of the material supporting sliding table, when the highest point is reached, namely the cylinder rod of the lower pressing block lifting cylinder 3 is contracted to the shortest point, a cylinder movement time is set, and when the time is over, the control subsystem reads the upper limit position 3 of the clamping material lower module 23 and stores the upper limit position for later use.
The reading process of the lower limit position 4 (hereinafter abbreviated as "position 4") of the preset material clamping lower module 23 is as follows:
the clamping material lower module can move up and down along with the lower clamping block 17 of the material supporting sliding table, when the lowest point is reached, namely the cylinder rod of the lower pressing block lifting cylinder 3 extends to the longest point, a cylinder movement time is set, and when the time is over, the control subsystem reads the lower limit position 4 of the clamping material lower module 23 and stores the lower limit position for later use.
Because the functions and the mechanical structures of the moving clamping material lower module 23 and the supporting blanking sliding table lower clamping block 17 determine that the stroke of the vertical movement is a fixed value, the lower limit position 3 of the clamping material lower module 23 is defined as a relative zero point position, the downward movement direction is a positive direction, and the reading value of the downward cylinder rod extending position is positive. The up and down stroke is mechanically limited to 3 mm.
When the material a is normally processed, the PLC system collects (once every sawing one beat) position information fed back by the clamping and unclamping stroke potentiometer 4 in real time, that is, the upper limit position 1 (hereinafter abbreviated as position a) of the clamping and feeding module 22 and the lower limit position 2 (hereinafter abbreviated as position B) of the clamping and feeding module 22, and the position information fed back by the lifting potentiometer 12, that is, the upper limit position 3 (hereinafter abbreviated as position C) of the clamping and feeding module 23 and the lower limit position 4 (hereinafter abbreviated as position D) of the clamping and feeding module 23, and judges and compares the position information in a user program for use.
When the material is normally clamped, the material clamping upper module 22 descends, the material clamping lower module 23 ascends, the real-time position value acquired and processed by the PLC system is read and compared with the position value stored for use in preparation work after the preset position + -specified tolerance range, and problems in work are judged. The method comprises the steps that a range value is obtained after adding or subtracting an appointed tolerance from a standby preset position stored in preparation work, therefore, when a real-time position value is compared with the standby preset position stored in preparation work, whether the current preset position is larger than the original preset position plus the appointed tolerance is judged, whether the current preset position is smaller than the original preset position minus the appointed tolerance is judged, whether the maximum value of the current preset position is equal to the original preset position plus the appointed tolerance is judged, and the minimum value of the current preset position is the original preset position minus the appointed tolerance. The specific comparison results and the illustrated problems are as follows:
when position B > position 2, a first problem is indicated, wherein the first problem is that no material is present, the material has been processed, the outer dimensions of the material may not be acceptable, or the direction of feed of the material may not be correct.
When the position B is less than the position 2, a second problem is shown, wherein the second problem is that foreign matters such as aluminum scraps exist between the clamping module and the material, the outer size of the material may be unqualified or the feeding and placing direction of the material may be incorrect.
When the position C > the position 3, it is explained that there is a foreign matter (aluminum chips, etc.) between the lower holding block 17 of the material-holding slide table and the side supporting block 10 of the material-holding slide table.
When the material normally loosens, the material clamping upper module 22 goes upward, the material clamping lower module 23 goes downward, the real-time position value acquired and processed by the PLC system at this time can be read and compared with the position value stored for standby in the preparation work after the preset position + -specified tolerance range, so as to judge the problems appearing in the work:
when the position A > the position 1, the clamping die connecting limiting bolt 26 is damaged.
When the position A < the position 1, the damage 26 of the clamping die connecting limiting bolt or the mechanical clamping is shown.
When the position C > the position 3, it means that there is a foreign matter (aluminum scrap, etc.) between the lower holding block 17 of the material-receiving slide table and the rail block 20.
The following is a cylinder versus electric cylinder:
the advantages of the cylinder are as follows:
(1) the requirement on the user is low. The air cylinder has simple principle and structure, is easy to install and maintain, and has low requirement on users. The electric cylinders are different, and engineering personnel must have certain electrical knowledge, otherwise, the electric cylinders are possibly damaged due to misoperation.
(2) The output force is large. The output force of the cylinder is in direct proportion to the square of the cylinder diameter; the output force of the electric cylinder is related to three factors, namely the cylinder diameter, the power of the motor and the screw pitch of the screw rod, and the larger the cylinder diameter and the power are, the smaller the screw pitch is, the larger the output force is. The theoretical output force of an air cylinder with the cylinder diameter of 50mm can reach 2000N, and for electric cylinders with the same cylinder diameter, although products of different companies are different, basically, the output force does not exceed 1000N. Obviously, the cylinder is more advantageous in terms of output force.
(3) And the adaptability is strong. The cylinder can work normally in high-temperature and low-temperature environments, has dustproof and waterproof capabilities, and can adapt to various severe environments. The electric cylinder has a large number of electric parts, so that the electric cylinder has high requirements on the environment and poor adaptability.
The advantages of the electric cylinder are mainly embodied in the following 3 aspects:
(1) the system is very simple in construction. Since the motor is usually integrated with the cylinder, together with the controller and the cable, the whole system of the electric cylinder is composed of these three parts, which is simple and compact.
(2) The number of stop positions is large and the control precision is high. The electric cylinder has a low end and a high end, the stop position of a low end product has 3, 5, 16 and 64 grades, and the stop position varies according to different companies; high-end products can reach hundreds or even thousands of positions. In the aspect of precision, the electric cylinder also has absolute advantages, and the positioning precision can be reached
So that it is often applied to precision industries such as electronics and semiconductors.
(3) The flexibility is strong. The flexibility of the electric cylinder is far stronger than that of the air cylinder. Because the controller can be directly connected with the PLC, the rotation speed, the positioning and the forward and reverse rotation of the motor can be accurately controlled, and the electric cylinder can move randomly according to the requirement to a certain extent; due to the compressibility of gas and inertia generated during movement, even if the reversing valve and the magnetic switch are matched with each other, the technical effects of accurate positioning of the electric cylinder and strong flexibility cannot be achieved.
In terms of technical performance, both electric and pneumatic are superior, and first of all, the advantages of electric actuators mainly include:
(1) compact structure and small volume. Compared with a pneumatic actuator, the electric actuator has a relatively simple structure, and a basic electronic system comprises the actuator, a three-position DPDT switch, a fuse and a plurality of wires, so that the electric actuator is easy to assemble.
(2) The driving source of the electric actuator is very flexible, the common vehicle-mounted power supply can meet the requirement, and the pneumatic actuator needs an air source and a compression driving device.
(3) The electric actuator has no risk of air leakage, has high reliability, and the air compressibility causes the pneumatic actuator to have poor stability.
(4) Installation and maintenance of various pneumatic lines is not required.
(5) The load can be maintained without power, while the pneumatic actuator requires a continuous pressure supply.
(6) The electric actuator is quieter since no additional pressure means are required. Usually, the pneumatic actuator is additionally provided with a silencer under the condition of heavy load.
(7) The electric actuator is superior in the accuracy of control.
(8) Pneumatic devices generally need to convert electrical signals into gas signals and then into electrical signals, and are slow in transmission speed, so that the pneumatic devices are not suitable for complex loops with excessive element levels.
The cylinder has the following advantages in 4 aspects:
(1) the load is large, and the high-torque output application can be adapted.
(2) The action is rapid and the reaction is rapid.
(3) The adaptability of the working environment is good, and the device is more superior to hydraulic, electronic and electric control in the severe working environments of flammability, explosion, dust, strong magnetism, radiation, vibration and the like.
(4) The motor is not easy to be damaged when the stroke is blocked or the valve rod is tied.
Fold purchase and application cost comparison:
in general, electric servo drives are more expensive than pneumatic servo drives, but are subject to specific requirements and situations. Some low power dc motors constitute an electric slide (electric servo) which is substantially cheaper than a pneumatic servo.
Such as: when the load is 1.5kg, the working stroke is 80mm, the speed is 2-170 mm/s, and the precision is
Acceleration of 2.5m/s2Under the same working conditions, the FESTO company adopts a small electric sliding table, a controller, a motor cable,The price of the electric servo system consisting of the control cable, the programming cable, the power supply cable and the like is 25 percent lower than that of the pneumatic servo system. The same is true for the electric cylinder with piston rod. It should be noted that if an ac motor is used, the price of the electric servo system is about 40% higher than that of the pneumatic servo system.
The current cylinder still has obvious advantages in terms of purchase and application cost. For a pneumatic system, a control system and an execution mechanism are very simple, each air cylinder can complete the switching of air paths only by being provided with one electromagnetic valve to perform motion control, the probability of the air cylinder breaking down is lower, the maintenance is simple and convenient, and the cost is low.
For the electric actuator, although the electric energy is easy to obtain and the energy cost is low, the purchase and application costs are high, and not only the motor is required to be configured, but also a set of mechanical transmission mechanism and corresponding driving elements are required. Meanwhile, the use of the electric actuator requires many protection measures, and the electric actuator is damaged by wrong circuit connection, voltage fluctuation and overload of a load, so that a protection system needs to be additionally arranged on a circuit and a machine, and a lot of extra cost is increased. In addition, since the parameterization of the electric actuator drive unit is high and the integration is high, the entire element must be replaced in case of a failure. And when the driving force required by the system is increased, the replacement of the elements in a set can be realized. Therefore, the comprehensive comparison shows that the cylinder has great advantages in purchasing and maintaining cost.
And (3) comparing the folding energy efficiency:
research results show that in the horizontal reciprocating motion with a short reciprocating motion period (less than 1min), the operation energy consumption of the electric actuator is generally lower than that of the air cylinder, namely, the electric actuator is more energy-saving. And when the reciprocating motion period is longer (more than 1min), the cylinder becomes more energy-saving. This is due firstly to the fact that the controller of the electric actuator usually needs to consume about 10W of electric power when the terminal is stopped, while the cylinder only consumes the solenoid valve and gas leaks, generally lower than 1W, i.e. the longer the terminal stop time, the more beneficial the cylinder is; secondly, the rated efficiency of the motor under the continuous rotation condition can reach more than 90 percent, but the average efficiency under the table-shaped acceleration and deceleration rotation condition in the linear reciprocating motion (screw rod conversion) is less than 50 percent. During vertical reciprocating motion, the holding action of the clamping workpiece requires continuous supply of current to the electric actuator to overcome gravity, and the cylinder only needs to close the electromagnetic valve, so that the power consumption is very low. The power consumption advantage of the electric actuator over the cylinder is not great in the vertical reciprocating movement.
As can be seen from the above, the motor itself has high efficiency, but the electric actuator does not necessarily have to save energy compared with the cylinder in consideration of the efficiency reduction and the power consumption of the controller during the reciprocating linear motion, and the specific comparison depends on the actual working conditions, i.e. the installation direction, the reciprocating motion period, the load factor, and the like.
Folding application comparison:
the pneumatic and electric systems are not mutually exclusive. Instead, this is only a different problem. The advantages of the pneumatic drive are readily apparent, and the pneumatic drive appears to be more environmentally friendly and robust when exposed to harsh environmental conditions such as dust, grease, water, or detergents. The pneumatic actuator is easy to install, provides a typical gripping function, is inexpensive and easy to operate.
Electric drives with servomotors are advantageous in situations where the force increases rapidly and precise positioning is required. For applications requiring precise, synchronized operation, adjustable and prescribed positioning programming, an electric drive is the best option, and an electric drive system consisting of a servo or stepper motor with a closed-loop positioning control can supplement the disadvantages of a pneumatic system.
From the perspective of technology and use cost, the cylinder has obvious advantages, but in actual use, which technology should be selected for driving control is still considered comprehensively by multiple factors. Various systems in modern control are more and more complex and more delicate, and various control functions of the systems can not be satisfied by a certain driving control technology. The cylinder can be simple, the rapid linear circulating motion is realized, the structure is simple, the maintenance is convenient, and meanwhile, the air cylinder can be used in various severe working environments, such as explosion-proof requirements, dusty or humid working conditions.
The electric actuator is mainly used in application occasions requiring precise control, the flexibility requirement in the existing automation equipment is continuously improved, the same equipment is often required to adapt to the processing requirements of workpieces with different sizes, the actuator needs to carry out multipoint positioning control, and the running speed and the moment of the actuator need to be precisely controlled or synchronously tracked, the control cannot be realized by utilizing the traditional pneumatic control, and the electric actuator can realize the control very easily. Therefore, the air cylinder is suitable for simple motion control, and the electric actuator is mostly used for precise motion control.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
The principle and the implementation of the present invention are explained herein by using specific examples, and the above description of the embodiments is only used to help understand the method and the core idea of the present invention; meanwhile, for the general technical personnel in the field, according to the idea of the present invention, there are changes in the concrete implementation and the application scope. In summary, the content of the present specification should not be construed as a limitation of the present invention.
Claims (6)
1. A cylinder linear positioner positioning system, comprising: the small sliding table feeding and clamping device, the clamping and loosening stroke potentiometer, the lifting stroke potentiometer and the control subsystem;
the clamping and loosening stroke potentiometer is arranged on a displacement potentiometer fixing support of a clamping plate on a sliding table of the small sliding table feeding and clamping device; the clamping and loosening stroke potentiometer is used for detecting the information of the upper limit position of the clamping upper module and the information of the in-place position of the lower pressing of the clamping upper module; the lifting stroke potentiometer is arranged on a lifting stroke potentiometer fixing plate of the small sliding table feeding clamping device; the lifting stroke potentiometer fixing plate is arranged on a support block on one side of the blanking sliding table; the lifting stroke potentiometer is used for detecting the information of the upper limit position of the material clamping lower module;
the control subsystem is respectively connected with the clamping and loosening stroke potentiometer and the lifting stroke potentiometer; and the control subsystem is used for controlling the material clamping cylinder and the lower pressing block lifting cylinder according to the position information detected by the clamping and loosening stroke potentiometer and the lifting stroke potentiometer.
2. The cylinder linear positioner positioning system of claim 1, wherein the clamp release stroke potentiometer and the lift stroke potentiometer are both linear potentiometers.
3. The cylinder linear positioner positioning system of claim 1, further comprising a human-machine interface touch screen, the human-machine interface touch screen being connected to the control subsystem; the human-computer interface touch screen is used for displaying position information detected by the clamping and loosening stroke potentiometer and the lifting stroke potentiometer.
4. The cylinder linear positioner positioning system of claim 1, further comprising an output alarm device; and the output alarm device is connected with the control subsystem.
5. The cylinder linear positioner positioning system of claim 1, further comprising a solenoid valve; one end of the electromagnetic valve is connected with the control subsystem, and the other end of the electromagnetic valve is connected with the air cylinder; the control subsystem controls the work of the air cylinder through the electromagnetic valve.
6. The cylinder linear positioner positioning system of claim 1, wherein the control subsystem comprises:
the PLC analog input module is used for acquiring position information detected by the clamping and loosening stroke potentiometer and the lifting stroke potentiometer;
the PLC analog quantity internal processing module is used for processing the position information detected by the clamping and loosening stroke potentiometer and the lifting stroke potentiometer, which is acquired by the PLC analog quantity input module;
and the PLC output terminal is used for transmitting the processing result of the PLC analog quantity internal processing module.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113341865A (en) * | 2021-06-10 | 2021-09-03 | 泸州北方化学工业有限公司 | Pneumatic servo positioning device for filling box in explosion-proof environment |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113341865A (en) * | 2021-06-10 | 2021-09-03 | 泸州北方化学工业有限公司 | Pneumatic servo positioning device for filling box in explosion-proof environment |
| CN113341865B (en) * | 2021-06-10 | 2022-10-25 | 泸州北方化学工业有限公司 | Pneumatic servo positioning device for filling box in explosion-proof environment |
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