CN111380677A - Fatigue testing machine for spring - Google Patents
Fatigue testing machine for spring Download PDFInfo
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- CN111380677A CN111380677A CN202010339722.5A CN202010339722A CN111380677A CN 111380677 A CN111380677 A CN 111380677A CN 202010339722 A CN202010339722 A CN 202010339722A CN 111380677 A CN111380677 A CN 111380677A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M13/00—Testing of machine parts
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M5/00—Investigating the elasticity of structures, e.g. deflection of bridges or air-craft wings
- G01M5/0041—Investigating the elasticity of structures, e.g. deflection of bridges or air-craft wings by determining deflection or stress
- G01M5/005—Investigating the elasticity of structures, e.g. deflection of bridges or air-craft wings by determining deflection or stress by means of external apparatus, e.g. test benches or portable test systems
- G01M5/0058—Investigating the elasticity of structures, e.g. deflection of bridges or air-craft wings by determining deflection or stress by means of external apparatus, e.g. test benches or portable test systems of elongated objects, e.g. pipes, masts, towers or railways
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/02—Details
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/02—Details
- G01N3/04—Chucks
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/32—Investigating strength properties of solid materials by application of mechanical stress by applying repeated or pulsating forces
- G01N3/38—Investigating strength properties of solid materials by application of mechanical stress by applying repeated or pulsating forces generated by electromagnetic means
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- General Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Engineering & Computer Science (AREA)
- Aviation & Aerospace Engineering (AREA)
- Electromagnetism (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The invention discloses a fatigue testing machine for springs, which comprises a workbench, wherein a plurality of groups of clamping units are arranged at the upper end of the workbench, a shifting unit is arranged on one side of each clamping unit, the shifting unit is detachably connected with the clamping units, the shifting unit is hinged and arranged on a driving unit, the clamping units are detachably connected with the workbench, the shifting unit is slidably connected with the workbench, and the driving unit is fixedly arranged above the workbench; the invention can simultaneously carry out the simultaneous fatigue test on a plurality of groups of springs to be tested, and can selectively carry out the simultaneous test on a plurality of groups of springs to be tested under the same maximum stretching/compressing amount in the process of the fatigue test of the plurality of groups of springs to be tested; or selectively carrying out a plurality of groups of springs to be tested under different maximum stretching/compressing amounts.
Description
Technical Field
The invention belongs to the field of spring fatigue tests, and particularly relates to a fatigue testing machine for springs.
Background
The spring is widely applied to various vibration equipment due to good elasticity, and has the performance of high stability and long service life, so the spring needs to be specially sampled for testing the fatigue strength after being produced.
At present, chinese patent with publication number CN204788912U discloses a spring fatigue testing machine, which comprises a frame, an upper platen lifting driving device, a lower platen, a stand group is arranged on the frame, a sliding table is arranged on the upper platen, the upper platen is arranged on the stand group through the sliding table in a sliding manner, the upper platen lifting driving device is fixedly arranged on the stand group, the upper platen lifting driving device comprises a rotating motor, a rotating arm and a swinging arm, the rotating motor is connected with the rotating arm, the rotating arm is hinged with one end of the swinging arm, the other end of the swinging arm is hinged with the sliding table, the lower platen is arranged opposite to the upper platen, and a spring to be tested is arranged between the upper platen and the.
The spring fatigue testing machine drives the upper pressure plate to do lifting action through the upper pressure plate lifting driving device so as to pull and press the spring, so that the limit of the spring is tested, but because the relative area of the upper pressure plate and the lower pressure plate is limited, the loading capacity of the spring is small, when more springs are required to be tested, multiple tests are required, and the total consumed time is long.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide a fatigue testing machine for a spring, which solves the technical problems solved by the background technology.
The purpose of the invention can be realized by the following technical scheme:
the utility model provides a fatigue testing machine for spring, includes the workstation, the workstation upper end is provided with a plurality of groups centre gripping units, and centre gripping unit one side is provided with stirs the unit, stirs the unit and is connected with centre gripping unit dismantlement formula, stirs the articulated installation of unit on drive unit.
The clamping unit is detachably connected with the workbench.
The poking unit is connected with the workbench in a sliding mode.
The driving unit is fixedly arranged above the workbench.
Further, the centre gripping unit includes the centre gripping box, and wherein the centre gripping box dismantles the formula and installs in the workstation upper end, and the bottom/one end side of centre gripping box is open form, is provided with in the centre gripping box along the gliding movable block of centre gripping box length direction, specifically through slotted key mode sliding connection between movable block and the centre gripping box inner wall, deviates from movable block one side fixed mounting of the open end in centre gripping box side has the couple, and the side blind end inner wall fixed mounting of centre gripping box has the couple simultaneously.
And a connector is fixedly arranged on one side of the movable block close to the open end of the side surface of the clamping box, and the connector is used for being connected with the shifting unit.
Further, the fixed block is fixedly mounted on two sides of the clamping box, the positioning groove matched with the fixed block is formed in the upper end of the workbench, and the fixed block is fixedly mounted on the positioning groove through a bolt.
Further, stir the unit and include the sliding block, the sliding block slides along the workstation, and sliding block upper end one side is provided with articulated adjusting screw, and wherein adjusting screw is close to centre gripping unit one side, and the cover is equipped with screw-thread fit's connecting rod on the adjusting screw, and wherein the connecting rod top is provided with the linking joint of rotating the connection, and wherein the linking joint cooperatees with the connector.
And a hinged poke rod is arranged on the other side of the upper end of the sliding block and is hinged with the driving unit.
Furthermore, the adapter joint is connected with the connector in a threaded fit manner.
Furthermore, a movable groove penetrating through the poke rod is formed in the poke rod, and a through hole is formed in the poke rod.
Further, the drive unit includes driving-disc, drive shaft, synchronous pulley mechanism and motor, and wherein motor fixed mounting is on the workstation, coaxial fixed connection between the output shaft of motor and the action wheel of synchronous pulley mechanism, coaxial fixed connection between the time driving wheel of synchronous pulley mechanism and the drive shaft, coaxial fixed connection between drive shaft and the driving-disc, the mounting hole of axial and radial array distribution is seted up to the driving-disc.
The driving disk is arranged in the movable groove of the poke rod, and the poke rod is connected with the driving disk in a bolt mode through the double-end stud.
The invention has the beneficial effects that:
the fatigue testing machine can simultaneously perform the fatigue resistance test on a plurality of groups of springs to be tested, and can selectively set the connecting positions of the poke rods and the driving disc among the groups on the mounting holes on the radius of the same driving disc in the fatigue resistance test process of the plurality of groups of springs to be tested, so that the fatigue testing machine for the springs can perform the simultaneous test on the plurality of groups of springs to be tested under the same maximum stretching/compressing amount; or the connection position of the poke rod and the driving disc among the groups is selectively arranged on the mounting holes on the radius of the non-identical driving disc, so that the fatigue testing machine for the spring performs simultaneous tests on the multiple groups of springs to be tested under different maximum stretching/compressing amounts.
Drawings
In order to more clearly illustrate the embodiments or technical solutions in the prior art of the present invention, the drawings used in the description of the embodiments or prior art will be briefly described below, and it is obvious for those skilled in the art that other drawings can be obtained based on these drawings without creative efforts.
FIG. 1 is a schematic diagram of the overall structure of an embodiment of the present invention;
FIG. 2 is a schematic partial structure diagram of an embodiment of the present invention;
FIG. 3 is a schematic partial structure diagram of an embodiment of the present invention;
fig. 4 is an enlarged schematic structural diagram at a in fig. 3 according to an embodiment of the present invention.
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.
As shown in fig. 1 to 3, the fatigue testing machine for the spring comprises a workbench 1, wherein a plurality of groups of clamping units 2 are arranged at the upper end of the workbench 1, a shifting unit 3 is arranged at one side of each clamping unit 2, the shifting unit 3 is detachably connected with the clamping units 2, and the shifting unit 3 is hinged to a driving unit 4;
wherein the clamping unit 2 is detachably connected with the workbench 1;
the shifting unit 3 is connected with the workbench 1 in a sliding way;
the drive unit 4 is fixedly mounted above the table 1.
During the use, the spring that will wait to detect is placed in clamping unit 2 in advance, clamping unit 2 carries out the centre gripping to the spring both ends that the centre gripping was waited to detect, the spring that the messenger waited to detect is located clamping unit 2, be relatively stable state, install clamping unit 2 on workstation 1, will stir unit 3 and be connected with clamping unit 2, drive unit 4 is used for the drive to stir unit 3 motion, the stirring unit 3 of motion is used for stretching or compressing the spring that waits to detect of centre gripping in clamping unit 2, through the repeated stretching or compression of a plurality of times, realize the fatigue detection to the spring.
In this embodiment, as shown in fig. 4, the clamping unit 2 includes a clamping box 20, wherein the clamping box 20 is detachably mounted at the upper end of the workbench 1, the bottom end/one end side of the clamping box 20 is open, a movable block 21 sliding along the length direction of the clamping box 20 is disposed in the clamping box 20, specifically, the movable block 21 is slidably connected with the inner wall of the clamping box 20 in a slot key manner, a hook 22 is fixedly mounted on the side of the movable block 21 away from the open end of the side of the clamping box 20, and a hook 22 is fixedly mounted on the inner wall of the closed end of the side of the clamping box 20;
a connector 23 is fixedly arranged on one side of the movable block 21 close to the open end of the side surface of the clamping box 20, wherein the connector 23 is used for being connected with the shifting unit 3;
when the device is used, two ends of a spring to be detected are respectively hung on the hooks 21 of the movable block 21 and the hooks 22 of the clamping box 20, the spring to be detected is located in the clamping box 20 and is in a relatively stable state, the movable block 21 of the poking unit 3 is connected with the clamping unit 2 through the connector 23, the clamping box 20 is installed on the workbench 1, the moving poking unit 3 is used for stretching or compressing the spring to be detected of the hooks 22 of the movable block 21, and the fatigue detection of the spring is realized after repeated stretching or compressing for a plurality of times;
meanwhile, in the process of testing the fatigue value of the spring, because the testing spring is positioned in a relatively closed space surrounded by the clamping box 20, the workbench 1 and the movable block 21, the phenomenon that once two ends of the spring fall off from the hook 22 in the testing process, the spring bounces out to cause damage when the spring is compressed is avoided.
In this embodiment, the fixing blocks 201 are fixedly mounted on two sides of the clamping box 20, and the positioning groove 11 matched with the fixing block 201 is formed in the upper end of the workbench 1, wherein the fixing block 201 is fixedly mounted on the positioning groove 11 through a bolt, that is, the clamping box 20 and the workbench 1 are fixed through a bolt, and the clamping box 20 and the workbench 1 are detachable; meanwhile, the positioning groove 11 is matched with the fixing block 201, so that the mounting position of the clamping box 20 on the workbench 1 can be quickly positioned.
In this embodiment, as shown in fig. 2 and fig. 3, the toggle unit 3 includes a sliding block 31, the sliding block 31 slides along the workbench 1, specifically, a sliding slot 12 corresponding to the sliding block 31 is formed at the upper end of the workbench 1, wherein the sliding block 31 slides along the sliding slot 12, a hinged adjusting screw 32 is disposed at one side of the upper end of the sliding block 31, wherein the adjusting screw 32 is close to one side of the clamping unit 2, a connecting rod 33 in threaded fit is sleeved on the adjusting screw 32, wherein a rotatably connected engagement joint 34 is disposed at the top end of the connecting rod 33, wherein the engagement joint 34 is matched with the connector 23, specifically, the engagement joint 34 is connected with the connector 23 through threaded fit;
the other side of the upper end of the sliding block 31 is provided with a hinged poke rod 35, and the poke rod 35 is hinged with the driving unit 4.
In actual operation, the toggle unit 3 is connected with the connector 23 of the movable block 21 through the adapter joint 34, so that the toggle unit 3 is connected with the clamping unit 2, the driving unit 4 drives the sliding block 31 to slide back and forth along the chute 12 through the toggle rod 35, the sliding block 31 sliding back and forth drives the movable block 21 to move through the adjusting screw 32, the connecting rod 33 and the adapter joint 34, the moving movable block 21 stretches or compresses the spring to be detected, and fatigue detection of the spring is realized after repeated stretching or compression for a plurality of times;
the adapter joint 34 can rotate around the sliding block 31 through the hinged adjusting screw rod 32, the adapter joint 34 can rotate by itself due to the fact that the adapter joint 34 is rotatably connected with the connecting rod 33, meanwhile, the bottom end of the clamping box 20 is open, rapid installation can be achieved between the connector 23 and the adapter joint 34 on the movable block 21 in the clamping box 20 provided with the spring to be tested, and after the adapter joint 34 and the connector 23 are installed and connected, the clamping box 20 is fixedly installed on the workbench 1 through bolts;
because between adjusting screw 32 and the connecting rod 33 through screw-thread fit, according to actual spring natural length that awaits measuring, adjust the overall length between adjusting screw 32 and the connecting rod 33, realize the initial time to the spring that awaits measuring detects, the spring that awaits measuring is in self natural length.
The poke rod 35 is provided with a movable groove 351 penetrating through the poke rod 35, and the poke rod 35 is provided with a through hole.
In this embodiment, as shown in fig. 3, the driving unit 4 includes a driving disc 41, a driving shaft 42, a synchronous pulley mechanism 43 and a motor 44, wherein the motor 44 is fixedly installed on the worktable 1, an output shaft of the motor 44 is coaxially and fixedly connected with a driving wheel of the synchronous pulley mechanism 43, a secondary driving wheel of the synchronous pulley mechanism 43 is coaxially and fixedly connected with the driving shaft 42, the driving shaft 42 is coaxially and fixedly connected with the driving disc 41, and the driving disc 41 is provided with mounting holes 410 distributed in an axial and radial array;
the driving disc 41 is located in the movable groove 351 of the poke rod 35, the poke rod 35 is connected with the driving disc 41 in a bolt mode through the stud 5, specifically, the stud 5 penetrates through the through hole of the poke rod 35 and the mounting hole 410 of the driving disc 41, and nuts in threaded fit with two ends of the stud 5 prevent the poke rod 35 and the driving disc 41 from falling off from each other by the nuts.
When the device is used, the motor 44 realizes intermittent forward rotation/reverse rotation of the driving disc 41 through the synchronous pulley mechanism 43 and the driving shaft 42, the driving disc 41 rotates forward rotation/reverse rotation, the rotating driving disc 41 drives the poke rod 35 to move, and the poke rod 35 drives the sliding block 31 to move (similar to a rocking handle sliding block mechanism);
in actual operation, the sliding block 31 slides back and forth to form adjustment by changing the connection position of the poke rod 35 and the driving disc 41, and the connection position of the poke rod 35 and the driving disc 41 is correspondingly adjusted according to the maximum stretching or compressing amount of the actual spring to be measured;
meanwhile, a plurality of driving discs 41 are driven by one driving source, so that the whole structure of the invention is more compact.
The working principle is as follows:
when the spring fatigue testing machine is used, springs to be tested with uniform models are installed in the clamping units 2, a plurality of groups of springs to be tested are subjected to simultaneous fatigue testing, in the process of the fatigue testing of the plurality of groups of springs to be tested, the connecting positions of the poke rods 35 and the driving discs 41 among the groups can be selectively arranged on the mounting holes 410 on the radius of the same driving disc 41, and therefore the fatigue testing machine for the springs is used for carrying out simultaneous testing on the plurality of groups of springs to be tested under the same maximum stretching/compressing amount; or the connecting positions of the poke rod 35 and the driving disc 41 among the groups are selectively arranged on the mounting holes 410 on the radiuses of the non-identical driving disc 41, so that the fatigue testing machine for the springs of the patent can simultaneously test the groups of springs to be tested under different maximum stretching/compressing amounts.
In the description herein, references to the description of "one embodiment," "an example," "a specific example" or the like are intended to mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed.
Claims (7)
1. A fatigue testing machine for springs comprises a workbench (1) and is characterized in that a plurality of groups of clamping units (2) are arranged at the upper end of the workbench (1), a shifting unit (3) is arranged on one side of each clamping unit (2), the shifting unit (3) is detachably connected with the clamping units (2), and the shifting unit (3) is hinged to a driving unit (4);
the clamping unit (2) is detachably connected with the workbench (1);
the shifting unit (3) is connected with the workbench (1) in a sliding manner;
the driving unit (4) is fixedly arranged above the workbench (1).
2. The fatigue testing machine for the springs, as claimed in claim 1, wherein the clamping unit (2) comprises a clamping box (20), wherein the clamping box (20) is detachably mounted at the upper end of the workbench (1), the bottom end/one end side of the clamping box (20) is open, a movable block (21) sliding along the length direction of the clamping box (20) is arranged in the clamping box (20), specifically, the movable block (21) is slidably connected with the inner wall of the clamping box (20) in a slot key manner, a hook (22) is fixedly mounted on one side of the movable block (21) departing from the open end of the side of the clamping box (20), and a hook (22) is fixedly mounted on the inner wall of the closed end of the side of the clamping box (20);
a connector (23) is fixedly installed on one side of the movable block (21) close to the open end of the side surface of the clamping box (20), wherein the connector (23) is used for being connected with the poking unit (3).
3. The fatigue testing machine for the springs as claimed in claim 2, wherein the fixing blocks (201) are fixedly mounted on two sides of the clamping box (20), and meanwhile, the positioning groove (11) matched with the fixing blocks (201) is formed in the upper end of the workbench (1), wherein the fixing blocks (201) are fixedly mounted on the positioning groove (11) through bolts.
4. The fatigue testing machine for the springs as claimed in claim 2, wherein the toggle unit (3) comprises a sliding block (31), the sliding block (31) slides along the workbench (1), one side of the upper end of the sliding block (31) is provided with a hinged adjusting screw rod (32), wherein the adjusting screw rod (32) is close to one side of the clamping unit (2), the adjusting screw rod (32) is sleeved with a connecting rod (33) in threaded fit, the top end of the connecting rod (33) is provided with a rotatably connected joint (34), and the joint (34) is matched with the connecting head (23);
and a hinged poke rod (35) is arranged on the other side of the upper end of the sliding block (31), and the poke rod (35) is hinged with the driving unit (4).
5. The fatigue testing machine for springs according to claim 4, wherein the connecting joint (34) is connected with the connecting head (23) by screw thread fit.
6. The fatigue testing machine for the spring as claimed in claim 4, wherein the tap lever (35) is provided with a movable groove (351) penetrating through the tap lever (35), and the tap lever (35) is provided with a through hole.
7. The fatigue testing machine for the springs is characterized in that the driving unit (4) comprises a driving disc (41), a driving shaft (42), a synchronous pulley mechanism (43) and a motor (44), wherein the motor (44) is fixedly installed on the workbench (1), an output shaft of the motor (44) is coaxially and fixedly connected with a driving wheel of the synchronous pulley mechanism (43), a secondary driving wheel of the synchronous pulley mechanism (43) is coaxially and fixedly connected with the driving shaft (42), the driving shaft (42) is coaxially and fixedly connected with the driving disc (41), and the driving disc (41) is provided with mounting holes (410) which are distributed in an axial and radial array;
the driving disc (41) is positioned in a movable groove (351) of the poke rod (35), and the poke rod (35) is connected with the driving disc (41) in a plug pin mode through the double-end stud (5).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010339722.5A CN111380677B (en) | 2020-04-26 | 2020-04-26 | Fatigue testing machine for spring |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010339722.5A CN111380677B (en) | 2020-04-26 | 2020-04-26 | Fatigue testing machine for spring |
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| CN111380677A true CN111380677A (en) | 2020-07-07 |
| CN111380677B CN111380677B (en) | 2021-10-15 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202010339722.5A Active CN111380677B (en) | 2020-04-26 | 2020-04-26 | Fatigue testing machine for spring |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111829796A (en) * | 2020-07-27 | 2020-10-27 | 无锡职业技术学院 | Adjusting mechanism of automobile suspension spring testing device |
| CN112945707A (en) * | 2020-08-17 | 2021-06-11 | 昆山麦斯特五金弹簧有限公司 | A pulling force detection device for spring production |
| CN114061955A (en) * | 2021-11-03 | 2022-02-18 | 人本股份有限公司 | Bearing vibration measuring mandrel |
| CN114544354A (en) * | 2022-03-30 | 2022-05-27 | 应急管理部研究中心 | Intelligent spring fatigue testing machine limit alarm device suitable for safety production |
| CN115615687A (en) * | 2022-12-16 | 2023-01-17 | 临沭县旭坤五金制造有限公司 | Spring anti-fatigue testing machine |
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| US20130036828A1 (en) * | 2010-04-26 | 2013-02-14 | Ihi Inspection & Instrumentation Co., Ltd. | Fixing jig fatigue testing test piece, and fatigue testing device |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111829796A (en) * | 2020-07-27 | 2020-10-27 | 无锡职业技术学院 | Adjusting mechanism of automobile suspension spring testing device |
| CN112945707A (en) * | 2020-08-17 | 2021-06-11 | 昆山麦斯特五金弹簧有限公司 | A pulling force detection device for spring production |
| CN112945707B (en) * | 2020-08-17 | 2024-06-11 | 昆山麦斯特五金弹簧有限公司 | Tension detection device for spring production |
| CN114061955A (en) * | 2021-11-03 | 2022-02-18 | 人本股份有限公司 | Bearing vibration measuring mandrel |
| CN114544354A (en) * | 2022-03-30 | 2022-05-27 | 应急管理部研究中心 | Intelligent spring fatigue testing machine limit alarm device suitable for safety production |
| CN115615687A (en) * | 2022-12-16 | 2023-01-17 | 临沭县旭坤五金制造有限公司 | Spring anti-fatigue testing machine |
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|---|---|
| CN111380677B (en) | 2021-10-15 |
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