Special gas spring life test machine
Technical Field
The invention relates to the field of detecting instruments, in particular to a special machine for testing the service life of a gas spring.
Background
The life test, also called a durability test, is a test performed to measure the service life of a product under a predetermined use and maintenance condition, and predict or verify weak links and dangerous portions of a structure. The endurance test is generally longer than the reliability test, and through the endurance test, which parts in the product design and manufacture have problems in reliability so as to improve the design or improve the process level, and meanwhile, the service life of a new product can be calculated by measuring the abrasion loss change of a main part.
The gas spring is an industrial accessory which can play a role in supporting, buffering, braking, height adjustment, angle adjustment and the like. The principle is that inert gas or oil-gas mixture is filled in a closed cylinder barrel, so that the pressure in the cylinder barrel is several times or dozens of times higher than the atmospheric pressure, and the movement of a piston rod is realized by utilizing the pressure difference generated by the cross section area of the piston rod being smaller than that of the piston. The gas spring is commonly used for an automobile engine hood and a trunk, and plays roles of buffering and supporting. In order to ensure safety and ensure that items must be checked during the service life test of the gas spring, the conventional gas spring service life tester mainly adopts a press machine to vertically press and lift, so that the real working state of an automobile engine hood and a backup cannot be simulated, and the result distortion condition is caused.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to solve the technical problem that when the service life of the existing gas spring is tested, a vertical press machine is mainly adopted to vertically press and lift the existing gas spring, the real working state of an automobile engine hood and a backup cannot be simulated, and the result distortion condition is caused.
The invention provides the following technical scheme: a special machine for testing the service life of a gas spring, which comprises a supporting mechanism, an actuating mechanism and a testing mechanism,
the supporting mechanism comprises a power seat, an adjustable supporting leg, a universal wheel, a base, a sliding support and a rack, wherein the power seat and the rack are independently arranged, an adjusting screw rod and a bearing plate are arranged on the power seat, and a servo motor is arranged on the bearing plate; the testing device comprises a rack, a testing mechanism and a control system, wherein the rack is formed by splicing and welding a plurality of square tubes, the rack comprises a plurality of bases on the upper surface, two rows of sliding supports and a plurality of cross braces, vertical braces and inclined braces are arranged on the cross braces, and the action mechanism and the testing mechanism are arranged on the rack; the bottom of the machine frame is arranged on a base, the lower surface of the base is provided with a plurality of telescopic adjustable support legs and universal wheels,
the actuating mechanism comprises a servo motor, a speed reducer, two chain wheels, a transmission chain, a driving assembly, a rocker arm and a rotary inductor, the power of the servo motor is transmitted to the chain wheels after the speed of the speed reducer is changed, the two chain wheels are respectively connected with an output shaft of the speed reducer and the driving assembly, two sides of each chain wheel are arranged on the rack through bearings, the two chain wheels transmit the power through the transmission chain, the driving assembly comprises a plurality of groups of bearing seats, cranks, rocker arms, cover type hinges and stop blocks, the cover type hinges are sleeved on the rocker arms, the cover type hinges are hinged with a core shaft with the centers of the rocker arms, and the cover type hinges and the rocker arms rotate around the core shaft; the chain wheel outputs power to the cranks, the cranks synchronously reciprocate and positively and negatively rotate, two symmetrical stop blocks are arranged on the upper surface of each cover type hinge, each stop block is provided with an arc-shaped notch, and the two cranks drive the pressure rods to press the stop blocks leftwards and rightwards so as to drive the rocker arms to reciprocally swing; the two ends of the rocker arm are provided with detachable limiting blocks, the rocker arm is also provided with a counterweight seat, the counterweight seat comprises an inserted link, and a counterweight block is inserted in the inserted link; the rotary inductor is arranged at one end of the driving component, a switch arc on the rotary inductor rotates along with the crank, the proximity switch detects the switch arc, signals are sent out at two ends of the proximity switch arc to control the servo motor to commutate,
the testing mechanism comprises a plurality of groups of detecting supports, rocker arms, sliding rods and connectors, the detecting supports can move along the inclined struts of the rack and can be locked on the inclined struts, the detecting supports are vertically arranged, the top of the detecting supports is provided with detectors, the detectors can detect the rocker arms when the rocker arms swing, and meanwhile, the swinging number is counted; two ends of the sliding rod are fixed on the sliding support, and the heights of the two ends of the sliding rod can be adjusted along the sliding support; two connectors in each group are respectively arranged on the rocker arm and the slide bar, the positions of the connectors are adjustable, the connectors are detachably connected with two ends of the gas spring,
the action mechanism drives the rocker arm to swing, so that the gas spring compresses and extends.
Furthermore, after the speed of the servo motor is regulated through a speed reducer, an output shaft is connected with a chain wheel through a quincunx elastic coupling.
Furthermore, the detection support, the bearing seat and the slide rod are more than four groups, so that the service life of more than four gas springs can be detected at the same time.
Furthermore, a protective cover casing is arranged on the outer sides of the chain wheel and the transmission chain, and the protective cover casing faces to one side of the rack and is opened.
Furthermore, the middle part of the balancing weight is provided with a groove matched with the rocker arm, the upper part of the inserted link is provided with a thread, and the balancing weight is prevented from being separated from the upper part of the inserted link through a nut.
Further, the detector is a proximity switch or an infrared sensor.
Furthermore, an inclined vibration damping support is installed on the rack, a matched buffer block is installed on the lower surface of the rocker arm end plate, and when the rocker arm descends, the buffer block is in contact with the vibration damping support.
Further, the frame is located the detection chamber, power seat, adjusting screw, speed reducer, servo motor are located the detection chamber outward.
The working principle of the invention is as follows:
when the special machine works, a piston rod of the gas spring is downwards and vertically arranged on the special machine for testing the service life of the gas spring by using connectors at two ends, and the remote sensing detected by the proximity switch is recorded in a starting-up cycle mode. And (3) operating the gas spring to circulate under the simulated working condition, wherein the circulating frequency is 10-16 times/min, and the temperature of the gas spring cylinder barrel in the whole test process is not more than 50 ℃. The force performance is measured according to a test method after 10000 times of circulation, and after 30000 times of circulation, the measured result is in accordance with the following regulations. When the control valve of the gas spring is closed, the piston has good sealing performance so as to ensure that the piston rod can be locked at any position. The gas spring subjected to the high-low temperature storage performance test can bear 3000 times of cycle life tests, and the decrement of the nominal force after the test is less than 10%. The invention simulates the real working conditions of the automobile engine hood and the trunk when being lifted and put down, monitors the pressing times of the gas spring when the gas spring fails through the detector, and automatically carries out measurement with high accuracy.
As shown in figure 2, the rack can move through the universal wheel, the height of the servo motor is adjusted through the adjusting screw rod, and the servo motor is installed outside the detection chamber, so that the noise and vibration influence during detection is reduced.
Compared with the prior art, the invention provides a special machine for testing the service life of a gas spring, which has the following beneficial effects:
1. the invention simulates the real working conditions of the automobile engine hood and the trunk when being lifted and put down, monitors the pressing times of the gas spring when the gas spring fails through the detector, and automatically carries out measurement, thus being more accurate;
2. the servo motor reciprocates to drive the rocker arm to swing in a reciprocating manner, so that air springs with different lengths and installation positions can be flexibly installed;
3. the pneumatic spring tester can drive a plurality of groups of pneumatic springs to detect at one time, and the servo motor and the machine body are independently arranged, so that the noise influence can be reduced, and the operation efficiency is higher.
Drawings
FIG. 1 is a schematic front view of a special gas spring life testing machine according to the present invention;
FIG. 2 is a schematic side view of the special gas spring life test machine installed in a detection chamber according to the present invention;
FIG. 3 is a schematic top view of the special gas spring life testing machine according to the present invention;
FIG. 4 is an enlarged perspective view of the rocker arm and drive assembly of the present invention;
FIG. 5 is an enlarged perspective view of an end of the rotary inductor and drive assembly of the present invention;
FIG. 6 is a schematic front and top view of a rocker arm in accordance with the present invention;
fig. 7 is an enlarged perspective view of the frame and the base according to the present invention.
In the figure: 1. the device comprises a power seat, 2, adjustable supporting legs, 3, universal wheels, 4, a base, 5, a sliding support, 6, a vibration reduction support, 7, a buffer block, 8, a rack, 9, a detection support, 10, a counterweight seat, 11, a sliding rod, 12, a rocker arm, 13, a driving assembly, 14, a connector, 15, a servo motor, 16, a detection chamber, 17, a bearing seat, 18, a rotary inductor, 19, a limiting block, 20, a cover type hinge, 21, a crank, 22, a stop dog, 23, a speed reducer, 24 and an adjusting screw rod.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1 and 2, a special machine for testing the service life of a gas spring comprises a supporting mechanism, an actuating mechanism and a testing mechanism.
The supporting mechanism comprises a power seat 1, adjustable supporting legs 2, universal wheels 3, a base 4, a sliding support 5 and a rack 8, the power seat 1 and the rack 8 are independently arranged, an adjusting screw 24 and a bearing plate are mounted on the power seat 1, and a servo motor 15 is mounted on the bearing plate. Referring to fig. 7, the frame 8 is formed by splicing and welding a plurality of square tubes, the frame 8 includes a plurality of bases on the upper surface, two rows of sliding supports 5, and a plurality of cross braces, vertical braces and diagonal braces are installed on the cross braces, and the action mechanism and the testing mechanism are installed on the frame 8. The bottom of the frame 8 is arranged on the base 4, and a plurality of telescopic adjustable support legs 2 and universal wheels 3 are arranged on the lower surface of the base 4.
Referring to fig. 3 and 4, the actuating mechanism includes a servo motor 15, a speed reducer 23, two chain wheels, two transmission chains, a driving assembly 13, a rocker arm 12, and a rotation sensor 18, the power of the servo motor 15 is transmitted to the chain wheels after being changed in speed by the speed reducer 23, the two chain wheels are respectively connected with an output shaft of the speed reducer 23 and the driving assembly 13, two sides of the chain wheels are mounted on the frame 8 through bearings, the two chain wheels transmit power through the transmission chains, the driving assembly 13 includes a plurality of sets of bearing seats 17, cranks 21, the rocker arm 12, a cover hinge 20, and a stopper 22, the cover hinge 20 is sleeved on the rocker arm 12, the cover hinge 20 is hinged to the center of the rocker arm 12 by a mandrel, and the cover hinge 20 and the rocker arm 12 rotate around the mandrel. The sprocket outputs power to the cranks 21, and the plurality of cranks 21 reciprocate in the forward and reverse directions in synchronization.
Referring to fig. 6, two symmetrical stoppers 22 are mounted on the upper surface of each cover hinge 20, the stoppers 22 have arc notches, and two cranks 21 drive the pressing rods to press the stoppers 22 left and right, so as to drive the rocker arm 12 to swing reciprocally. Detachable stopper 19 is installed at both ends on the rocking arm 12, still installs counter weight seat 10 on the rocking arm 12, counter weight seat 10 includes the inserted bar, and it has the balancing weight to peg graft in the inserted bar.
Referring to fig. 5, the rotary inductor 18 is installed at one end of the driving assembly 13, the switch arc on the rotary inductor 18 rotates along with the crank 21, the proximity switch detects the switch arc, signals are sent out at two ends of the proximity switch arc, the servo motor 15 is controlled to commutate,
testing mechanism includes that the multiunit surveys support 9, rocking arm 12, slide bar 11, connector 14, survey support 9 and can follow the bracing removal of frame 8 and can lock on the bracing, survey the vertical setting of support 9, the detector is installed at the top, the detector can detect rocking arm 12 when rocking arm 12 swings, counts swing quantity simultaneously. Two ends of the sliding rod 11 are fixed on the sliding support 5, and the height of the two ends of the sliding rod 11 can be adjusted along the sliding support 5. Two connectors 14 are arranged in each group and are respectively arranged on the rocker arm 12 and the slide bar 11, the position of the connector 14 is adjustable, the connector 14 is detachably connected with two ends of the gas spring,
the actuating mechanism drives the rocker arm 12 to swing, so that the gas spring compresses and extends.
In one example, the servo motor 15 is shown as being speed regulated by a speed reducer 23, and the output shaft is connected to the sprocket by a quincunx elastic coupling.
In one example, the detection bracket 9, the bearing seat 17 and the slide rod 11 have more than four groups, and more than four gas springs can be used for detecting the service life at the same time.
In one example, the sprocket and the transmission chain are externally provided with a protective casing, and the protective casing is opened towards one side of the frame 8.
In one example, the middle part of the balancing weight is provided with a groove matched with the rocker arm 12, the upper part of the inserted rod is provided with a thread, and the balancing weight is prevented from falling off through a nut.
In one example, the detector is a proximity switch or an infrared sensor.
In one example, an inclined damping support 6 is installed on the frame 8, a matched buffer block 7 is installed on the lower surface of an end plate of the rocker arm 12, and when the rocker arm 12 descends, the buffer block 7 is in contact with the damping support 6.
In one example, the frame 8 is located in the detection chamber 16, and the power base 1, the adjusting screw 24, the speed reducer 23 and the servo motor 15 are located outside the detection chamber 16.
The working principle of the invention is as follows:
when the gas spring life test special machine works, a piston rod of the gas spring is downwards and vertically arranged on the gas spring life test special machine through the connectors 14 at two ends, and remote sensing detected by the proximity switch is recorded in a starting-up cycle mode. And (3) operating the gas spring to circulate under the simulated working condition, wherein the circulating frequency is 10-16 times/min, and the temperature of the gas spring cylinder barrel in the whole test process is not more than 50 ℃. The force performance is measured according to a test method after 10000 times of circulation, and after 30000 times of circulation, the measured result is in accordance with the following regulations. When the control valve of the gas spring is closed, the piston has good sealing performance so as to ensure that the piston rod can be locked at any position. The gas spring subjected to the high-low temperature storage performance test can bear 3000 times of cycle life tests, and the decrement of the nominal force after the test is less than 10%. The invention simulates the real working conditions of the automobile engine hood and the trunk when being lifted and put down, monitors the pressing times of the gas spring when the gas spring fails through the detector, and automatically carries out measurement with high accuracy.
As shown in FIG. 2, the frame 8 can move through the universal wheel 3, the height of the servo motor 15 is adjusted through the adjusting screw rod 24, and the servo motor 15 is installed outside the detection chamber 16, so that the noise and vibration influence during detection is reduced.
In summary, the following steps: the invention simulates the real working conditions of the automobile engine hood and the trunk when the automobile engine hood and the trunk are lifted and put down, monitors the pressing times of the gas spring when the gas spring fails through the detector, and has the advantages of automatic measurement, more accuracy and higher operating efficiency.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.