CN213041480U - Linear push rod tester - Google Patents
Linear push rod tester Download PDFInfo
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- CN213041480U CN213041480U CN201921977010.5U CN201921977010U CN213041480U CN 213041480 U CN213041480 U CN 213041480U CN 201921977010 U CN201921977010 U CN 201921977010U CN 213041480 U CN213041480 U CN 213041480U
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Abstract
The utility model relates to a linear push rod tester, which comprises a cabinet body, a servo motor, a ball screw, a linear guide rail, a sliding table and an electrical control system, wherein the servo motor, the ball screw, the linear guide rail, the sliding table and the electrical control system are arranged in the cabinet body in a double-station mode; slip table bottom suit is on ball and gomphosis on linear guide movably, and servo motor controls ball's function to the motion of control slip table on linear guide, the upper portion of slip table is equipped with the sensor connecting block, and strain gauge force sensor is connected to this connecting block downside, and the power of the linear push rod that will await measuring passes through the sensor connecting block and transmits to strain gauge force sensor. The utility model discloses replace cylinder loading load power with the electricity drive, use the servo motor encoder to detect linear displacement's global design scheme indirectly, a key operation, the operative employee easily goes up the hand, and the leak detection rate is low, uses this tester back, and the volume of returning goods reworking reduces at least, has guaranteed the quality of shipment product, has also won the reputation for the enterprise.
Description
Technical Field
The utility model relates to an electrical components field, concretely relates to straight line push rod tester.
Background
The linear push rod is an electrical component for converting the rotary motion of a direct current or alternating current motor into the linear motion of the push rod. The linear push rod is a main part of various electric lifting tables and chairs and medical health fitness equipment products, a complete industrial chain for producing and manufacturing the linear push rod is formed in the surrounding areas of Changzhou, and the products are sold in the United states, Europe and other parts of the world besides being supplied to domestic markets.
Before the linear push rod leaves a factory, whether various performance parameters of a product meet the requirements of a drawing or not needs to be detected. When detecting, a constant load force (push rods of different types and different magnitudes of load force) needs to be applied, and parameters needing to be detected under the load force comprise: the stroke and the locking force clearance of the push rod, the current average value of the push rod motor, the average linear speed of the push rod and the detection value are compared with the standard value to judge whether the push rod product is qualified or not, and each product is required to be inspected by downstream manufacturers. At present, a detection device of a linear push rod manufacturer adopts an air cylinder to generate constant load force, the push rod is electrified to reversely push the air cylinder to linearly move, the distance between the stroke and the locking force is manually read through a digital caliper, real-time current is read through an ammeter, and the speed can be only judged by naked eyes of workers. The detection device has a simple structure, the biggest defect is that the provided load force is unstable, and the error between the magnitude of the load force and the specified value is large. When the model of the tested push rod is changed, the pressure of the compressed air is changed through the pressure reducing valve, so that the load force is changed, and the method is also relatively extensive. Secondly, the manual reading ammeter only intercepts a certain instantaneous value in the whole detection process, and cannot reflect the current change condition in the whole detection process, so that the randomness is high; thirdly, the automation degree is low, the labor intensity of workers is high, the products are missed to be inspected due to carelessness caused by carelessness of operators, and the products are returned to the client to bring economic loss to companies.
Disclosure of Invention
The utility model provides a linear push rod tester adopts motor drive to realize the loading of invariable load power, and strain type force transducer real-time supervision load power size, servo motor encoder and current sensor record stroke, locking force clearance size and the electric current of push rod motor respectively to show the dynamic variation condition of being surveyed the parameter in real time through the touch-sensitive screen curve, the average value is calculated in the automatic sampling, and automatic standard parameter with setting for is compared and is given the qualified conclusion of product.
The utility model provides a linear push rod tester, includes the cabinet body, servo motor, ball, linear guide, slip table and electrical control system, its characterized in that:
the servo motor, the ball screw, the linear guide rail, the sliding table and the electric control system are arranged in the cabinet body in a double-station mode;
the bottom of the sliding table is sleeved on the ball screw and movably embedded on the linear guide rail, and the servo motor controls the operation of the ball screw so as to control the movement of the sliding table on the linear guide rail; a sensor fixing block is arranged at the lower part of the sliding table, and a strain type force sensor is arranged on the upper side surface of the sensor fixing block;
a sensor connecting block is arranged between the strain type force sensor and the linear push rod to be detected so as to transmit the force of the linear push rod to be detected to the strain type force sensor through the sensor connecting block;
the servo motor is controlled by an electrical control system, a power supply wiring part of the linear push rod is arranged beside the servo motor, and the front panel at the lower part of the servo motor fixes the linear push rod to be tested;
the servo motors are respectively a left servo motor and a right servo motor and are respectively provided with a left station servo driver and a right station servo driver;
the electric control system comprises a PLC, an AD/DA module EM06 matched with the PLC for expansion, and a touch screen;
the AD/DA module EM06 provides 4 analog quantity inputs and 2 analog quantity outputs, wherein 4A/D channels are respectively connected with 2 strain gauge type force sensors and 2 current sensors at double stations; the current sensor is arranged in the cabinet body, an input circuit of the current sensor is connected with a power supply circuit of the linear push rod to be detected in series, and the other end of the current sensor is connected to an AD/DA module EM 06; and 2D/A channels respectively output 0-10V torque commands to the left station servo driver and the right station servo driver.
Furthermore, the tester adopts a double-station design, the functions of the two stations are completely the same, the two stations realize the starting of the detection process and the manual control of the linear push rod through entity buttons, and the entity buttons comprise a travel switch, an original point switch and other buttons.
Furthermore, the servo motor adopts an HG-KN73J-S100 Mitsubishi motor, the rated torque of the motor is 2.39N.m, the maximum torque of the motor is 8.36N.m, and the power of the motor is 750W.
Furthermore, the PLC selects Siemens S7-200 SMART ST30, 4 high-speed counter channels are integrated and used for receiving encoder pulses from a servo motor, the PLC is connected with physical buttons such as a travel switch and an origin switch, and the PLC controls the forward and reverse rotation of a motor of the tested linear push rod.
Further, the touch screen adopts a Kunlun state 7-inch TPC7062KS type display.
Furthermore, the picture structure of the touch screen is a welcome picture, a current effective parameter picture and a parameter setting picture which can be switched mutually, and a summary table picture, wherein the summary table picture is further connected with a collected data historical table, a collected data real-time curve table and a sliding table position manual control three pictures.
Furthermore, a parameter setting picture in the touch screen is suitable for push rod tests of different models, and a user can input normal ranges of parameters such as load force, stroke, current, locking force gap, speed and the like of the push rod model to be tested in the picture, and power is removed and stored in the touch screen.
Furthermore, the bottom of the cabinet body is provided with universal wheels with brakes.
The utility model discloses the beneficial effect who reaches does: the utility model discloses to the requirement of current sharp push rod producer, provide a sharp push rod detector. Three not enough to original detection device, creatively proposed the power consumption displacement and replaced cylinder loading load power, used servo motor encoder to detect linear displacement's global design, through the test the utility model discloses the detector of development has solved three not enough of original detection device betterly, a key operation, and the operative employee is easily got up, and the omission factor is low, uses behind this tester, and linear push rod's low reaches producer returns goods and reworks volume has reduced 2/3 at least, has guaranteed the quality of shipment product, has also won reputation for the enterprise.
Drawings
Fig. 1 is the structure schematic diagram of the utility model relates to a linear push rod tester.
Fig. 2 is the utility model relates to a slip table part side view of linear push rod tester.
Fig. 3 is a block diagram of the hardware structure of the electrical control system of the present invention.
Fig. 4 is a flow chart of the use of the tester of the present invention.
Fig. 5 is a schematic diagram of a touch screen image structure of the present invention.
In the figure, 1-cabinet body, 2-servo motor, 4-linear push rod to be measured, 5-touch screen, 6-sliding table, 7-ball screw, 8-linear guide rail, 9-solid button, 10-sensor connecting block, 11-strain type force sensor, 12-universal wheel, 13-sensor fixing piece, 14-bolt and 15-round bar.
Detailed Description
The technical solution of the present invention will be further described in detail with reference to the accompanying drawings.
The utility model provides a linear push rod tester, includes cabinet body 1, servo motor 2, ball 7, linear guide 8, slip table 6 and electrical control system.
The servo motor 2, the ball screw 7, the linear guide rail 8, the sliding table 6 and the electric control system are arranged in the cabinet body 1 in a double-station mode. The bottom of the sliding table 6 is sleeved on the ball screw 7 and movably embedded on the linear guide rail 8, and the servo motor 2 controls the operation of the ball screw 7 so as to control the movement of the sliding table 6 on the linear guide rail 8.
Referring to fig. 2, the lower portion of the sliding table 6 is fixed to a sensor fixing block 13 by bolts, a fixing groove is correspondingly formed in the upper side surface of the sensor fixing block 13, and the strain type force sensor 11 is disposed in the fixing groove and fixed to the sensor fixing block 13 by bolts.
Set up sensor connecting block 10 between strain gauge force sensor 11 and the linear push rod 4 that awaits measuring so that pass through sensor connecting block 10 with the power of the linear push rod 4 that awaits measuring and transmit to strain gauge force sensor 11, do not set up direct mechanical connection between sensor connecting block 10 and the slip table 6. The lower end of the sensor connecting block 10 is fixed on an elastic element of the strain type force sensor 11 through a bolt, and the lower end of the push rod of the linear push rod 4 to be detected is fixed on the sensor connecting block 10 through a bolt 14.
Servo motor 2 is controlled by electrical control system, and servo motor 2 is other to be equipped with linear push rod's power wiring department, is provided with the round hole on the front panel of servo motor 2 lower part, also is equipped with the round hole on the linear push rod 4 that awaits measuring, passes these two round holes as the bolt through a pole 15, and linear push rod 4 that will await measuring gets up with servo motor 2 fixed connection of tester. The servo motors 2 are respectively a left servo motor 2 and a right servo motor 2 which are respectively provided with a left station servo driver and a right station servo driver. The electrical control system comprises a PLC, an AD/DA module EM06 matched with the PLC for expansion, and a touch screen 5. The AD/DA module EM06 provides 4 analog inputs and 2 analog outputs, wherein 4A/D channels are connected to 2 strain gauge force sensors and 2 current sensors at two stations, respectively. The current sensor is arranged in the cabinet body, an input circuit of the current sensor is connected with a power supply circuit of the linear push rod to be detected in series, the large current of the motor is linearly converted into the small current of 4-20mA, and the small current is output to the AD/DA module EM06 from the other end of the current sensor. And 2D/A channels respectively output 0-10V torque commands to the left station servo driver and the right station servo driver. The bottom of the cabinet body 1 is provided with a universal wheel 12 with a brake.
The mechanical structure of the detector adopts a classical form of a servo motor 2, a ball screw 7, a linear guide rail 8 and a sliding table 6, as shown in figure 1. The servo driver works in a torque mode, so that the servo motor 2 outputs constant torque, and the friction force of the linear guide rail 8 and the variation of the pretightening force of the lead screw are measured in advance to be less than 60N and far less than the load force to be loaded. Therefore, the motor torque is converted into the load force loaded on the tested linear push rod through the sliding table 6 to be considered as constant. The push rod of the linear push rod 4 to be measured reversely pushes the sliding table 6 downwards or pulls the sliding table 6 upwards through the sensor connecting block 10, the strain type force sensor 11 and the sensor fixing block 13, and the strain type force sensor 11 monitors the load force of the push rod to be measured in real time. The detector is required to be capable of adapting to detection of push rods of different models, different load forces can be conveniently loaded, and the output torque of the servo motor 2 is changed by changing the torque instruction voltage in the torque mode of the servo driver, so that the load force of the sliding table 6 for the linear push rod is changed.
Under the action of the load force, the linear displacement of the sliding table 6 is detected, so that the stroke and the locking force clearance of the push rod are obtained. The utility model discloses do not use linear displacement sensor such as grating chi to detect the linear displacement of slip table 6, and the pulse that uses the output of servo motor 2 encoder obtains the linear displacement of motor angular displacement back indirect acquisition slip table 6 to can reduce cost, ball 7 eliminates the clearance after the pretension and can satisfy the requirement that detects the precision, and servo motor 2 encoder is very feasible technically through the pulse of outside output motor encoder behind the servo driver frequency division.
In addition, the current sensor is used for sampling the current of the push rod motor, and then the average value is calculated.
The tester considers the beat requirement of a production line, adopts a double-station design, and the two stations have completely the same function. The operation button boxes of the two stations are completely separated, the starting of the detection process and the manual control of the linear push rod are realized through the entity buttons 9 instead of the buttons of the touch screen 5, the convenience of the operation of workers on the production field is fully considered, and the design principle of human engineering is met.
The mechanical structure of the tester is a typical ball screw 7 nut pair structure, and a load torque calculation formula of the servo motor 2 is used:
in the formula, TLFor a load torque (n.m) translated to the motor shaft; f is the force (N) required to move the slide 6 axially; l is the mechanical displacement (m) of the motor per rotation; t isCConverting the friction torque of the ball screw 7 nut or bearing and the like into the load torque (N.m) on the motor shaft; η is the efficiency of the drive system.
The ball screw 7 shaft of the tester is vertically arranged, the influence of gravity is considered, and the push rod moves downwards under the assumption that the load force applied by the sliding table 6 is upward;
F＝Fc+W+μ(fg+Fcf) (2)
in the formula, FcA reaction force (N) that is a linear push rod; w is the total weight (N) of sliding parts such as the work piece of the workbench and the like; mu is a friction coefficient; f. ofgPanel locking force (N); fcfIs a positive pressure (N) that the sliding table 6 is pressed to the guide rail due to the reaction force of the linear push rod.
FcCustomer requests a maximum of 5000N, W300N, μ 0.05, fgTake 500N, FcfTaking 300N, F5340N is calculated from equation (2). T isCTaking 0.2N.m, eta 0.9, L0.005 m and calculating T by using formula (1)L4.92 n.m. As the tested push rod needs to be replaced and the push rod to be tested is loaded every time a linear push rod is tested, the servo motor 2 does not work continuously and can work in a repeated use area of a motor characteristic curve, and the model finally selected is the Mitsubishi servo motor 2HG-KN73J-S100 which has the rated torque of 2.39N.m and the maximum torque of 8.36 by combining the working condition of the tester
N.m, power 750W, can fully satisfy the use requirement of this tester.
The hardware of the electric control system takes PLC as a control core, Siemens S7-200 SMART ST30 is selected, and an expanded AD/DA module EM06 is matched to provide 4 analog quantity input and 2 analog quantity output, as shown in figure 3. 2 strain type force transducer in duplex position, 2 current sensor make full use of 4 AD passageways, and the 0~10V torque instruction of output to the driver has utilized 2D/A passageways. ST30 incorporates 4 high speed counter channels for receiving encoder pulses from the servo motor 2. In order to graphically show each parameter dynamic variation condition of sampling among the testing process, this tester disposes touch-sensitive screen 5, and touch-sensitive screen 5 adopts 7 cun TPC7062KS displays of Kunlun normal attitude, and economical and practical can satisfy the utility model discloses the requirement completely.
The software of the electric control system comprises two parts of contents, PLC program, 5 picture of the touch screen, script and strategy. The PLC program is responsible for controlling the time sequence of the whole detection process, and the script and the strategy of the touch screen 5 are responsible for data acquisition and processing in the later period. The PLC program completes manual extension and retraction control of the tested linear push rod, real-time monitoring of the running speed of the sliding table 6 (based on safety requirements of customers), and the functions of real-time sampling of load force, stroke displacement, current and the like in the process of detecting the linear push rod by matching with the touch screen 5, and the flow chart is shown in figure 3.
The PLC programming adopts the most common ladder diagram language, STEP7-MicroWIN SMART programming software is used, common applications including high-speed counting, PID, position control and the like are built in the software, the guide operation is simple and does not make mistakes, and the high-speed counting function used by the tester can complete the configuration and use of two high-speed counting channels only by inputting necessary parameters under the guide of the guide.
As shown in fig. 4, the touch screen 5 is responsible for collecting stroke, current, load force, and locking force gap data. The starting and the ending of data acquisition are triggered through a strategy function of the Kunlun normal state touch screen 5, the sampling period is 1 second, the dynamic change conditions of all parameters are visually displayed in a real-time curve picture in a graphical mode, the acquired data are stored in the touch screen 5 in a history table function, and a user can conveniently open or close the touch screen. The data collected in the history table is automatically averaged and then displayed in a summary table picture, and the data in the first 6 seconds are not stable and need to be eliminated because the dynamic response of the strain type force sensor 11 is poor. The circulation script of the touch screen 5 automatically judges whether the push rod is qualified or not according to the normal range of the stroke, the current, the locking force gap and the speed set by the parameter picture, a green light or a red light is lightened, if any one parameter is unqualified, the whole push rod is unqualified. The structure of the screen of the touch panel 5 is shown in fig. 5.
As before, the tester requires to be adapted to push rod tests of different models, so that a parameter setting picture is specially designed, and a user can input normal ranges of parameters such as load force, stroke, current, locking force gap, speed and the like of the linear push rod 4 to be tested on the picture, and power is saved in the touch screen 5 after power is cut off.
The above description is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiment, but all equivalent modifications or changes made by those skilled in the art according to the present invention should be included in the protection scope of the claims.
Claims (7)
1. The utility model provides a linear push rod tester, includes the cabinet body, servo motor, ball, linear guide, slip table and electrical control system, its characterized in that:
the servo motor, the ball screw, the linear guide rail, the sliding table and the electric control system are arranged in the cabinet body in a double-station mode;
the bottom of the sliding table is sleeved on the ball screw and movably embedded on the linear guide rail, and the servo motor controls the operation of the ball screw so as to control the movement of the sliding table on the linear guide rail; a sensor fixing block is arranged at the lower part of the sliding table, and a strain type force sensor is arranged on the upper side surface of the sensor fixing block;
a sensor connecting block is arranged between the strain type force sensor and the linear push rod to be detected so as to transmit the force of the linear push rod to be detected to the strain type force sensor, and no direct mechanical connection is arranged between the sensor connecting block and the sliding table;
the servo motor is controlled by an electrical control system, a power supply wiring part of a linear push rod is arranged beside the servo motor, and a clamp is arranged on a front panel at the lower part of the servo motor and used for fixing the linear push rod to be tested;
the servo motors are respectively a left servo motor and a right servo motor and are respectively provided with a left station servo driver and a right station servo driver;
the electric control system comprises a PLC, an AD/DA module EM06 matched with the PLC for expansion, and a touch screen;
the AD/DA module EM06 provides 4 analog quantity inputs and 2 analog quantity outputs, wherein 4A/D channels are respectively connected with 2 strain gauge type force sensors and 2 current sensors at double stations; the current sensor is arranged in the cabinet body, an input circuit of the current sensor is connected with a power supply circuit of the linear push rod to be detected in series, and the other end of the current sensor is connected to an AD/DA module EM 06; and 2D/A channels respectively output 0-10V torque commands to the left station servo driver and the right station servo driver.
2. The linear pusher tester of claim 1, wherein: the tester adopts the design of duplex position, and two stations function is the same completely, and two stations all realize the start-up of detecting the flow and the manual control of sharp push rod through the entity button, the entity button includes buttons such as travel switch, initial point switch.
3. The linear pusher tester of claim 1, wherein: the servo motor adopts an HG-KN73J-S100 Mitsubishi motor, the rated torque of the motor is 2.39N.m, the maximum torque of the motor is 8.36N.m, and the power of the motor is 750W.
4. The linear pusher tester of claim 1, wherein: the PLC selects Siemens S7-200 SMART ST30, is integrated with 4 high-speed counter channels and is used for receiving encoder pulses from a servo motor, the PLC is connected with entity buttons such as a travel switch and an origin switch, and the PLC controls the forward and reverse rotation of a motor of the linear push rod to be tested.
5. The linear pusher tester of claim 1, wherein: the touch screen adopts a Kunlun state 7-inch TPC7062KS type display.
6. The linear pusher tester of claim 5, wherein: the picture structure of the touch screen is a welcome picture, a current effective parameter picture and a parameter setting picture which can be switched mutually, and a summary table picture which is further connected with a collected data history table, a collected data real-time curve table and a sliding table position manual control three pictures.
7. The linear pusher tester of claim 1, wherein: the bottom of the cabinet body is provided with universal wheels with brakes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921977010.5U CN213041480U (en) | 2019-11-15 | 2019-11-15 | Linear push rod tester |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921977010.5U CN213041480U (en) | 2019-11-15 | 2019-11-15 | Linear push rod tester |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN213041480U true CN213041480U (en) | 2021-04-23 |
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ID=75518926
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921977010.5U Active CN213041480U (en) | 2019-11-15 | 2019-11-15 | Linear push rod tester |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN213041480U (en) |
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2019
- 2019-11-15 CN CN201921977010.5U patent/CN213041480U/en active Active
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