CN114278647A - Loading test device of servo hydraulic cylinder - Google Patents
Loading test device of servo hydraulic cylinder Download PDFInfo
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- CN114278647A CN114278647A CN202111586864.2A CN202111586864A CN114278647A CN 114278647 A CN114278647 A CN 114278647A CN 202111586864 A CN202111586864 A CN 202111586864A CN 114278647 A CN114278647 A CN 114278647A
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Abstract
A load testing device of a servo hydraulic cylinder, the load testing device comprising: the main frame comprises two triangular frames which are arranged in parallel, and the triangular frames are formed by welding and splicing three connecting rods; the earring adjusting assembly comprises an earring base and an adjusting guide rail; the movable rocker arm comprises two large arms and two small arms which are matched with each other, one end of each large arm is fixed on the rotating shaft, and the other end of each large arm is provided with three load hanging holes at equal intervals; the loading test load assembly comprises a load connecting fixing rod, a load hanging pin shaft and a standard load block; the control assembly comprises a computer, wherein a plurality of A/D conversion circuits and D/A conversion circuits are arranged on the computer, the computer is connected with a detection element through the A/D conversion circuits and a conditioning circuit, and the computer is connected with an electro-hydraulic servo valve through the D/A conversion circuits and a servo drive circuit.
Description
The technical field is as follows:
the invention relates to a loading test device of a servo hydraulic cylinder.
Background art:
the servo hydraulic cylinder is a hydraulic actuating element which converts hydraulic energy into mechanical energy and makes linear reciprocating motion or swinging motion; it has simple structure and reliable operation. When it is used to implement reciprocating motion, it can omit speed-reducing device, and has no transmission gap, and its motion is stable, so that it can be extensively used in various mechanical hydraulic systems. The output force of the hydraulic cylinder is in direct proportion to the effective area of the piston and the pressure difference between the two sides of the effective area; the hydraulic cylinder is basically composed of a cylinder barrel and a cylinder cover, a piston and a piston rod, a sealing device, a buffering device and an exhaust device.
The servo hydraulic cylinder is an actuating element in a hydraulic transmission system and is an energy conversion device for converting hydraulic energy into mechanical energy; the hydraulic motor realizes continuous rotary motion, the hydraulic cylinder realizes reciprocating motion, the structural style of the hydraulic cylinder comprises three categories of a piston cylinder, a plunger cylinder and a swing cylinder, the piston cylinder and the plunger cylinder realize reciprocating linear motion and output speed and thrust, the swing cylinder realizes reciprocating swing and output angular speed and torque, the hydraulic cylinder can be used singly or combined by two or more than two or other mechanisms to complete special functions, the hydraulic cylinder has simple structure and reliable work, and is widely applied to a hydraulic system of a machine tool.
In a hydraulic system, a servo hydraulic cylinder is an important execution element in the hydraulic system, and the performance of the servo hydraulic cylinder directly affects the stability of the whole hydraulic system, so that before the hydraulic system is used, the performance of the hydraulic cylinder needs to be tested to judge whether the hydraulic cylinder meets the use requirement; the existing testing device is narrow in application range, cannot be suitable for hydraulic cylinders with different specifications, is poor in universality and low in testing accuracy; meanwhile, the unbalance loading can also generate larger deviation on the test result of the hydraulic cylinder, and the popularization is not facilitated.
The invention content is as follows:
the embodiment of the invention provides a loading test device for a servo hydraulic cylinder, which is reasonable in structural design, can quickly, accurately and quickly carry out loading test on the servo hydraulic cylinders with different specifications based on the mutual cooperation of a plurality of mechanical components and the integrated control action of an electric element, thereby accurately judging the performance of the servo hydraulic cylinder.
The technical scheme adopted by the invention for solving the technical problems is as follows:
a load testing device of a servo hydraulic cylinder, the load testing device comprising:
the main frame comprises two triangular frames which are arranged in parallel, the triangular frames are formed by welding and splicing three connecting rods, reinforcing plates are welded on two sides of the top of each triangular frame respectively, and the top end of each triangular frame is bored and provided with a rotating bearing;
the ear ring adjusting assembly comprises an ear ring base and an adjusting guide rail, wherein the ear ring base is used for connecting an ear ring at the rear end of a cylinder body of the servo hydraulic cylinder to be tested, the adjusting guide rail is used for adjusting the installation position of the servo hydraulic cylinder to be tested, a T-shaped groove is formed in the adjusting guide rail, and two rows of threaded holes are formed in two sides of the T-shaped groove respectively so as to fix the ear ring base on the adjusting guide rail;
the swing rocker arm comprises two large arms and two small arms which are matched with each other, the large arms and the small arms are respectively connected with the rotating bearings of the triangular frames through rotating shafts, and the large arms and the small arms are symmetrically distributed on two sides of the servo hydraulic cylinder to be tested by taking the servo hydraulic cylinder to be tested as a center; one end of each large arm is fixed on the rotating shaft, and the other end of each large arm is provided with three load hanging holes at equal intervals; one end of each small arm is fixed on the rotating shaft, and the other end of each small arm is connected with a pin shaft and a piston rod lug of the servo hydraulic cylinder to be tested, so that the small arm and the large arm always keep the same angle; one end of the small arm, which is connected with the servo hydraulic cylinder to be tested, is correspondingly connected with the large arm through a lifting rod and a lifting plate;
the loading test load assembly comprises a load connecting fixing rod, a load hanging pin shaft and a standard load block, wherein the top end of the load connecting fixing rod is connected with the load hanging hole through the load hanging pin shaft, and the bottom end of the load connecting fixing rod is connected with the standard load block;
the control assembly comprises a computer, wherein a plurality of A/D conversion circuits and D/A conversion circuits are arranged on the computer, the computer is connected with a detection element through the A/D conversion circuits and a conditioning circuit, and the computer is connected with an electro-hydraulic servo valve through the D/A conversion circuits and a servo drive circuit.
The detection assembly comprises a torque sensor, a pressure sensor and a displacement sensor, and the torque sensor is arranged on the main frame.
The A/D conversion circuit adopts a MAX6021A chip, converts the voltage of 3.3V output by the power supply module into 2.048V through the MAX6021A chip, provides a reference voltage for an AD module of the chip, and provides a 16-path AD conversion interface, which can be used for collecting current feedback signals.
The D/A conversion circuit adopts a MAX532 chip and is provided with 16 pins, the MAX532 is a 12-bit D/A converter with double-channel serial input, receives data of a core board through an SP interface, and converts the data into corresponding voltage signals.
The conditioning circuit employs an amplifier AD622 AN.
The servo drive circuit consists of a first-stage instrument operational amplifier AD622AN and a second-stage power operational amplifier LH0041, the electro-hydraulic servo valve drive circuit requires that a voltage signal of-10-10V is added at the end D/A1, and a current signal of-40-40 mA is output at the end AB.
By adopting the structure, the main frame is formed by the two triangular frames which are arranged in parallel, a corresponding structure is provided for the loading test of the servo hydraulic cylinder, and the strength of the main frame is enhanced by matching with the reinforcing ribs and the reinforcing plates; the ear ring adjusting assembly is used for customizing according to the model size of the servo hydraulic cylinder to be tested, connecting the ear ring at the rear end of the cylinder body of the servo hydraulic cylinder to be tested and adjusting the mounting position of the servo hydraulic cylinder to be tested; connecting a piston rod lug of the servo hydraulic cylinder to be tested through swinging a rocker arm to fixedly connect the servo hydraulic cylinder to be tested; the loading test is carried out by loading the test load assembly according to a force and moment formula F1L1＝F2L2And a servo fluidThe loading test requirements of the pressure cylinder are met, and loads are selected to be hung on hanging holes with different distances, so that different loading test requirements of the servo hydraulic cylinder tests with different specifications and models are met; detect moment signal, pressure signal and displacement signal through control assembly to the electro-hydraulic valve of drive moves according to staff's requirement, accomplishes and installs the test additional, has accurate high efficiency, advantage that the commonality is strong.
Description of the drawings:
FIG. 1 is a schematic structural diagram of the present invention.
Fig. 2 is a front view of fig. 1.
FIG. 3 is a schematic structural diagram of a load testing assembly according to the present invention.
Fig. 4 is a schematic structural view of an earring adjustment assembly of the present invention.
Fig. 5 is a schematic structural diagram of the control assembly of the present invention.
Fig. 6 is an electrical schematic diagram of the D/a conversion circuit of the present invention.
Fig. 7 is an electrical schematic diagram of the a/D conversion circuit of the present invention.
Fig. 8 is an electrical schematic diagram of a servo drive circuit of the present invention.
In the figure, the test device comprises a torque sensor 1, a regulating guide rail 2, a main frame 3, a rotating bearing 4, a swinging rocker arm 5, a load connecting fixing rod 6, a servo hydraulic cylinder to be tested 7, a standard load block 8, an earring base 9, an earring base 10, a load hanging hole 11, a load hanging pin shaft 12 and a rotating shaft.
The specific implementation mode is as follows:
in order to clearly explain the technical features of the present invention, the following detailed description of the present invention is provided with reference to the accompanying drawings.
As shown in fig. 1-8, a load testing apparatus of a servo hydraulic cylinder, the load testing apparatus comprising:
the main frame 3 comprises two triangular frames which are arranged in parallel, the triangular frames are formed by welding and splicing three connecting rods, reinforcing plates are welded on two sides of the top of each triangular frame respectively, and the top end of each triangular frame is bored and provided with a rotating bearing 4;
the earring adjusting assembly comprises an earring base 9 and an adjusting guide rail 2, wherein the earring base 9 is used for connecting an earring at the rear end of a cylinder body of the servo hydraulic cylinder 7 to be tested, the adjusting guide rail 2 is used for adjusting the installation position of the servo hydraulic cylinder 7 to be tested, a T-shaped groove is formed in the adjusting guide rail 2, two rows of threaded holes are formed in two sides of the T-shaped groove respectively, and the earring base 9 is fixed on the adjusting guide rail 2;
the swing rocker arm 5 comprises two large arms and two small arms which are matched with each other, the large arms and the small arms are respectively connected with the rotating bearing 4 of the triangular frame through a rotating shaft 12, and the large arms and the small arms are symmetrically distributed on two sides of the servo hydraulic cylinder 7 to be tested by taking the servo hydraulic cylinder 7 to be tested as a center; one end of each big arm is respectively fixed on the rotating shaft 12, and the other end of each big arm is respectively provided with three load hanging holes 10 at equal intervals; one end of each small arm is fixed on the rotating shaft 12, and the other end of each small arm is respectively connected with a pin shaft and a piston rod lug of the servo hydraulic cylinder 7 to be tested, so that the small arm and the large arm always keep the same angle; one end of the small arm, which is connected with the servo hydraulic cylinder 7 to be tested, is correspondingly connected with the large arm through a lifting rod and a lifting plate;
the loading test load assembly comprises a load connecting fixing rod 6, a load hanging pin shaft 11 and a standard load block 8, wherein the top end of the load connecting fixing rod 6 is connected with a load hanging hole 10 through the load hanging pin shaft 11, and the bottom end of the load connecting fixing rod 6 is connected with the standard load block 8;
the control assembly comprises a computer, wherein a plurality of A/D conversion circuits and D/A conversion circuits are arranged on the computer, the computer is connected with a detection element through the A/D conversion circuits and a conditioning circuit, and the computer is connected with an electro-hydraulic servo valve through the D/A conversion circuits and a servo drive circuit.
The detection assembly comprises a torque sensor 1, a pressure sensor and a displacement sensor, wherein the torque sensor 1 is arranged on the main frame 3.
The A/D conversion circuit adopts a MAX6021A chip, converts the voltage of 3.3V output by the power supply module into 2.048V through the MAX6021A chip, provides a reference voltage for an AD module of the chip, and provides a 16-path AD conversion interface, which can be used for collecting current feedback signals.
The D/A conversion circuit adopts a MAX532 chip and is provided with 16 pins, the MAX532 is a 12-bit D/A converter with double-channel serial input, receives data of a core board through an SP interface, and converts the data into corresponding voltage signals.
The conditioning circuit employs an amplifier AD622 AN.
The servo drive circuit consists of a first-stage instrument operational amplifier AD622AN and a second-stage power operational amplifier LH0041, the electro-hydraulic servo valve drive circuit requires that a voltage signal of-10-10V is added at the end D/A1, and a current signal of-40-40 mA is output at the end AB.
The working principle of the loading test device of the servo hydraulic cylinder in the embodiment of the invention is as follows: based on the mutually-matched action of a plurality of mechanical components, the integrated control action of an electric element is combined, the loading test can be rapidly, accurately and rapidly carried out on the servo hydraulic cylinders with different specifications, so that the performance of the servo hydraulic cylinder is accurately judged, the universality is high, the influence caused by unbalance loading can be effectively eliminated, the test error is reduced, the test result is accurate and reliable, the popularization is easy, and the application scene is wide.
In the whole scheme, mainly include main frame 3, earring adjusting part, swing rocking arm 5, loading test load subassembly and control assembly to can be applicable to the test of different specification servo hydraulic cylinders, guarantee that the test result of acquireing is accurate reliable.
For the main frame, including two parallel triangle frames of placing, triangle frame is formed by three connecting rods welding concatenation, guarantee the stability of test, the reinforcing plate has been welded respectively to every triangle frame's top both sides, the welding strengthening rib comes fixed main frame 3, 3 welding backs of accomplishing of main frame, the top of every triangle frame carries out the bore hole respectively and handles and guarantees the axiality of bore hole, deep ditch ball rolling bearing 4 is packed into to installation bore hole size and the size of swing 5 rotation axis 12 of rocking arm, guarantee test environment stability, thereby furthest reduces deviation and the influence of external condition to the test result.
The ear ring adjusting assembly comprises an ear ring base 9 and an adjusting guide rail 2, wherein the ear ring base 9 is used for connecting an ear ring at the rear end of a cylinder body of a servo hydraulic cylinder 7 to be tested, the adjusting guide rail 2 is used for adjusting the installation position of the servo hydraulic cylinder 7 to be tested, a T-shaped groove is formed in the adjusting guide rail 2 and used for enabling the ear ring base 9 to slide to adjust the installation position, two rows of threaded holes with the aperture M14 are formed in two sides of the T-shaped groove respectively, the distance between the threaded holes is 5cm, when the servo hydraulic cylinder is loaded and tested, the position of the ear ring base 9 is adjusted on the adjusting guide rail 2 according to testing requirements, after the position is determined, an M14 hexagonal screw is inserted into a preset threaded hole of the adjusting guide rail 2 and is fastened to a preset value by using a torque wrench. To fix the earring mount 9 to the adjustment guide 2.
The swing rocker arm 5 comprises two large arms and two small arms which are matched with each other, the large arms and the small arms are respectively connected with the rotating bearing 4 of the triangular frame through a rotating shaft 12, and the large arms and the small arms are symmetrically distributed on two sides of the servo hydraulic cylinder 7 to be tested by taking the servo hydraulic cylinder to be tested as a center; one end of each big arm is respectively fixed on the rotating shaft 12, and the other end of each big arm is respectively provided with three load hanging holes 10 at equal intervals; one end of the small arm is respectively fixed on the rotating shaft 12, and the other end of the small arm is respectively connected with a pin shaft and a piston rod lug of the servo hydraulic cylinder 7 to be tested, so that the small arm and the large arm always keep the same angle; one end of the small arm, which is connected with the servo hydraulic cylinder 7 to be tested, is correspondingly connected with the large arm through a lifting rod and a lifting plate, so that the strength of the swing rocker arm 5 is enhanced; according to the force and moment formula F1L1＝F2L2And selecting to hang the load on the load hanging holes 10 with different distances according to the loading test requirements of the servo hydraulic cylinders, so as to meet different loading test requirements of the servo hydraulic cylinder tests with different specifications and models.
For the loading test load assembly, the loading test load assembly comprises a load connecting fixing rod 6, a load hanging pin shaft 11 and a standard load block 8, wherein the top end of the load connecting fixing rod 6 is connected with a load hanging hole 10 through the load hanging pin shaft 11, and the bottom end of the load connecting fixing rod 6 is connected with the standard load block 8; the single standard load block 8 is made of 45# steel and is in a circular ring shape, the overall dimension is adjusted, the mass of the load block is guaranteed to be 50kg, the standard load blocks 8 form two groups of load groups with the same mass when a servo hydraulic cylinder is loaded and tested, the load groups are connected in series through the load connecting fixing rod 6, loads are hung on the load hanging holes 10 of the swing rocker arm 5 through the pin shafts, and the load mass can be completed by increasing and decreasing the number of the standard load blocks 8.
Preferably, the control assembly comprises a computer, a plurality of A/D conversion circuits and D/A conversion circuits are arranged on the computer, the computer is connected with the detection element through the A/D conversion circuits and the conditioning circuit, and the computer is connected with the electro-hydraulic servo valve through the D/A conversion circuits and the servo drive circuit; the detected torque signal, pressure signal and displacement signal are input into the computer, and the control signal output by the computer is converted and amplified to drive the electrohydraulic valve to move as required to complete the loading test, and the electrohydraulic valve can change fast and accurately with the change of the input quantity, so as to reach the specific requirements of simulating the field working state of the servo hydraulic cylinder and testing the performance of the servo hydraulic cylinder.
Furthermore, the standard load block can be made of metal, such as 45# steel, Q235, Q345, cast iron HT200.500 and the like, or can be made of metal such as brass, red copper and the like; under certain conditions, non-metals having a certain mass and density, such as cement prefabricated blocks, can also be selected; in the use process, the quality of each standard load block is guaranteed to be uniform, errors in the actual operation process are reduced, and the accuracy of a test result is further guaranteed.
In actual use, the loading test device is fixed on a laboratory bench through a pressure plate, and the rotating shaft 12 of the swinging rocker arm 5 is inserted into the rotating bearing 4 of the main frame 1; the standard load blocks 8 are combined into two groups of load groups with the same mass, the load groups are connected in series by a load connecting fixing rod 6, and the load is hung and installed on a load hanging hole 10 on the swing rocker arm through a load hanging pin shaft 11, so that different loading test requirements of servo hydraulic cylinder tests with different specifications and models are met according to a force and moment formula F1L1＝F2L2The load can be hung on the hanging holes 10 with different distances, and the number of the standard load blocks 8 can be increased or decreased.
Further, the position of the earring base 9 on the adjusting guide rail 2 is adjusted according to the test requirements, after the position is determined, an M14 hexagon screw is inserted into a preset threaded hole of the adjusting guide rail, and a torque wrench is used for fastening the preset threaded hole to fix the earring base; the cylinder body of the servo hydraulic cylinder 7 to be tested is connected with the lug ring base through a pin shaft, the lug ring at the end of the piston rod is connected with the swinging rocker arm through a pin shaft, and the torque sensor 1 is installed on the main frame and is connected to the rotating shaft 12 of the swinging rocker arm.
After the servo hydraulic cylinder 7 to be tested is connected and set, the control assembly is built, the displacement sensor, the pressure sensor and the torque sensor 1 are installed on the testing device, the electro-hydraulic servo valve is debugged by matching the A/D conversion circuit and the D/A conversion circuit, and in order to ensure the expandability of the electro-hydraulic servo valve, a standard input interface and a standard output interface are also designed.
Preferably, the D/A conversion circuit uses a MAX532 chip. MAX532 is a 12bit D/A converter with double-path serial input, a three-wire SPI interface with the data transmission speed of 6MHz, 15V double-pole supply, 10mA input current and the lowest conversion time of which can be as low as 2.5 mus. The MAX532 receives the data from the core board via the SP interface and converts it to a corresponding voltage signal.
Preferably, the a/D conversion circuit uses a MAX6021A chip, converts the voltage of 3.3V output by the power supply module into 2.048V through the MAX6021A chip, and provides a 16-way AD conversion interface, which can be used for collecting the current feedback signal.
After the control assembly is connected and built, a program is compiled and burned according to the test requirements, monitoring software on a PC is operated, the PC sends a command, the test result is observed, and information data fed back by a rod cavity pressure sensor, a rodless cavity pressure sensor and a torque sensor 1 of the servo hydraulic cylinder to be detected is collected and analyzed, so that the loading test of the servo hydraulic cylinder is realized.
In summary, the loading test device for the servo hydraulic cylinder in the embodiment of the invention is based on the mutual cooperation of the multiple mechanical components, and is combined with the integrated control function of the electrical element, so that the loading test can be rapidly, accurately and rapidly performed on the servo hydraulic cylinders with different specifications, the performance of the servo hydraulic cylinder can be accurately judged, the universality is strong, the influence caused by unbalanced load can be effectively eliminated, the test error is reduced, the test result is accurate and reliable, the popularization is easy, and the application scene is wide.
The above-described embodiments should not be construed as limiting the scope of the invention, and any alternative modifications or alterations to the embodiments of the present invention will be apparent to those skilled in the art.
The present invention is not described in detail, but is known to those skilled in the art.
Claims (6)
1. A load testing device for a servo hydraulic cylinder, the load testing device comprising:
the main frame comprises two triangular frames which are arranged in parallel, the triangular frames are formed by welding and splicing three connecting rods, reinforcing plates are welded on two sides of the top of each triangular frame respectively, and the top end of each triangular frame is bored and provided with a rotating bearing;
the ear ring adjusting assembly comprises an ear ring base and an adjusting guide rail, wherein the ear ring base is used for connecting an ear ring at the rear end of a cylinder body of the servo hydraulic cylinder to be tested, the adjusting guide rail is used for adjusting the installation position of the servo hydraulic cylinder to be tested, a T-shaped groove is formed in the adjusting guide rail, and two rows of threaded holes are formed in two sides of the T-shaped groove respectively so as to fix the ear ring base on the adjusting guide rail;
the swing rocker arm comprises two large arms and two small arms which are matched with each other, the large arms and the small arms are respectively connected with the rotating bearings of the triangular frames through rotating shafts, and the large arms and the small arms are symmetrically distributed on two sides of the servo hydraulic cylinder to be tested by taking the servo hydraulic cylinder to be tested as a center; one end of each large arm is fixed on the rotating shaft, and the other end of each large arm is provided with three load hanging holes at equal intervals; one end of each small arm is fixed on the rotating shaft, and the other end of each small arm is connected with a pin shaft and a piston rod lug of the servo hydraulic cylinder to be tested, so that the small arm and the large arm always keep the same angle; one end of the small arm, which is connected with the servo hydraulic cylinder to be tested, is correspondingly connected with the large arm through a lifting rod and a lifting plate;
the loading test load assembly comprises a load connecting fixing rod, a load hanging pin shaft and a standard load block, wherein the top end of the load connecting fixing rod is connected with the load hanging hole through the load hanging pin shaft, and the bottom end of the load connecting fixing rod is connected with the standard load block;
the control assembly comprises a computer, wherein a plurality of A/D conversion circuits and D/A conversion circuits are arranged on the computer, the computer is connected with a detection element through the A/D conversion circuits and a conditioning circuit, and the computer is connected with an electro-hydraulic servo valve through the D/A conversion circuits and a servo drive circuit.
2. A load testing device of a servo hydraulic cylinder according to claim 1, characterized in that: the detection assembly comprises a torque sensor, a pressure sensor and a displacement sensor, and the torque sensor is arranged on the main frame.
3. A load testing device of a servo hydraulic cylinder according to claim 1, characterized in that: the A/D conversion circuit adopts a MAX6021A chip, converts the voltage of 3.3V output by the power supply module into 2.048V through the MAX6021A chip, provides a reference voltage for an AD module of the chip, and provides a 16-path AD conversion interface, which can be used for collecting current feedback signals.
4. A load testing device of a servo hydraulic cylinder according to claim 1, characterized in that: the D/A conversion circuit adopts a MAX532 chip and is provided with 16 pins, the MAX532 is a 12-bit D/A converter with double-channel serial input, receives data of a core board through an SP interface, and converts the data into corresponding voltage signals.
5. A load testing device of a servo hydraulic cylinder according to claim 1, characterized in that: the conditioning circuit employs an amplifier AD622 AN.
6. A load testing device of a servo hydraulic cylinder according to claim 1, characterized in that: the servo drive circuit consists of a first-stage instrument operational amplifier AD622AN and a second-stage power operational amplifier LH0041, the electro-hydraulic servo valve drive circuit requires that a voltage signal of-10-10V is added at the end D/A1, and a current signal of-40-40 mA is output at the end AB.
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| CN202111586864.2A CN114278647A (en) | 2021-12-23 | 2021-12-23 | Loading test device of servo hydraulic cylinder |
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| CN106640846A (en) * | 2017-02-14 | 2017-05-10 | 南京航空航天大学 | Servo actuator high-dynamic loading device based on linear motor drive reinforcement module |
| WO2021046985A1 (en) * | 2019-09-12 | 2021-03-18 | 清华大学 | Electro-hydraulic servo actuator for implementing long-path and high-frequency loading, and control method |
| CN212621436U (en) * | 2020-09-13 | 2021-02-26 | 长春德力测控试验***有限公司 | Electronic jar capability test device |
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