CN109374453B - Lock torsion fatigue testing machine - Google Patents
Lock torsion fatigue testing machine Download PDFInfo
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- CN109374453B CN109374453B CN201811460064.4A CN201811460064A CN109374453B CN 109374453 B CN109374453 B CN 109374453B CN 201811460064 A CN201811460064 A CN 201811460064A CN 109374453 B CN109374453 B CN 109374453B
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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
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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
- G01N3/06—Special adaptations of indicating or recording means
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0014—Type of force applied
- G01N2203/0021—Torsional
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0058—Kind of property studied
- G01N2203/0069—Fatigue, creep, strain-stress relations or elastic constants
- G01N2203/0073—Fatigue
Abstract
The invention provides a lockset torsion fatigue tester, which comprises a rectangular seat A, a power supply control box and a detection structure main body; the motor base top end face is fixedly connected with one motor, and the motor is electrically connected with the speed regulator. The rectangular seats B of the two groups of detection structure main bodies can be connected and fixed through the trapezoidal iron clamps, the trapezoidal grooves B and the elastic cards B; when the rectangular seats B of the two groups of detection structure main bodies are connected and fixed, the gear D on the first group of detection structure main bodies is meshed with the gear B on the second group of detection structure main bodies, so that the second group of detection structure main bodies can be driven to operate; thirdly, because of band pulley A cup joints through the belt with band pulley B, so can guarantee that band pulley A and band pulley B carry out the syntropy and rotate, ensure that the second group detects the normal operating of structure main part.
Description
Technical Field
The invention belongs to the technical field of lockset detection equipment, and particularly relates to a lockset torsional fatigue tester.
Background
The lockset is widely applied to daily life, in particular to a lockset on an indoor door and an outdoor door. The existing lockset mainly comprises a panel, a handle, a lock body, a lock core, a key and the like; current tool to lock twists reverse check out test set mainly is to the lock core and detects, but the lock body also has life equally, rotation handle on the tool to lock links to each other with the lock body, when not using the key to pin the lock core, generally we all rotate the inside parts of lock body operation of handle drive door and open and close the door, but the lock body has life equally, reach when life takes place to damage when the lock body, will unable open the door, so I need a detection device, when the tool to lock dispatches from the factory, through the fatigue strength who detects the lock body, know the life of tool to lock body.
On the basis, the lock torsion fatigue testing machine developed by the inventor mainly has the following two advantages, such as:
efficiency of software testing is higher, twists reverse fatigue degree to the tool to test at present, mainly rotates the imitative handle through the motor and twists, tests the life that the number of times of twisting detected the lock body in the tool to lock, but can not detect simultaneously a plurality of tools to lock, for example: when a newly produced lockset is tested in a lock manufacturing factory, time is wasted, and the testing efficiency is low, so that the testing efficiency can be greatly improved if a plurality of locksets can be simultaneously subjected to torsion testing; the test precision is higher, through the counter, carries out accurate count to the number of times of wrench movement, for example: the lockset handle is twisted to touch the primary counter once, so that primary counting is carried out, and the accuracy of the test is improved.
Disclosure of Invention
In order to solve the technical problems, the invention provides a lockset torsion fatigue testing machine which has the advantages of higher detection efficiency and higher detection accuracy during detection.
The invention relates to a lock torsional fatigue tester, which is realized by the following specific technical means:
the lock torsional fatigue tester comprises a rectangular seat A, a trapezoidal groove A, a rectangular groove A, an elastic clamping piece A, a motor seat, a motor, a gear A, a rectangular seat B, a trapezoidal clamping iron, a trapezoidal groove B, a rectangular groove B, an elastic clamping piece B, a rectangular plate, a sliding track, a clamp structure, a lock body main body, a gear B, a gear C, a belt wheel A, a gear D, a belt wheel B, a gear E, a cam, a cylindrical rotating shaft, a poking plate, a pressing counter, a rolling ball, a speed regulator, a power supply control box and a detection structure main body; the right end face of the rectangular seat A is provided with one trapezoid groove A, the front end face and the rear end face of the rectangular seat A are provided with one rectangular groove A, and each rectangular groove A is internally provided with one elastic clamping piece A; the motor base is welded on the top end face of the rectangular base A; the top end face of the motor base is fixedly connected with the motor, and the motor is electrically connected with the speed regulator; the motor rotating shaft is fixedly connected with one gear A; a trapezoidal clamping iron is arranged on the left end face of the rectangular seat B, and a trapezoidal groove B is formed in the right end face of the rectangular seat B; the front end face and the rear end face of the rectangular seat B are both provided with a rectangular groove B, and each rectangular groove B is internally provided with one elastic clamping piece B; the sliding rail is welded in the front of the top end face of the rectangular seat B; the sliding rail is internally and slidably connected with the clamp structure; one of the lock body bodies is clamped in the clamp structure; the top end face of the rectangular seat B is welded with the rectangular plate; (positions 10-21 are described according to fig. 3) the right position of the front end surface of the rectangular plate is rotatably connected with a gear B through a rotating shaft; the front end face of the rectangular plate is positioned at the left side of the gear B and is rotationally connected with the gear C through a rotating shaft, and the front end face of the gear C is fixedly connected with the belt wheel A; the front end face of the rectangular plate is positioned at the left side position of the gear C and is rotationally connected with a gear D through a rotating shaft, and the gear D is fixedly connected with a belt wheel B; the front end face of the rectangular plate is positioned below the gear C and is rotationally connected with the gear E through a rotating shaft, and the rotating shaft is also fixedly connected with the cam at the position on the front side of the gear E; the front end face of the rectangular plate is positioned at the left side of the gear E and is rotationally connected with the cylindrical rotating shaft; the poking plate is fixedly connected to the front side of the outer wall of the cylindrical rotating shaft, and the rear end of the cylindrical rotating shaft is sleeved with the lock body; the power supply control box is fixedly connected to the upper position of the front end face of the motor base; the front end face of the motor base is fixedly connected with the speed regulator at a position below the power supply control box, and the speed regulator is electrically connected with the power supply control box; the top end of the rectangular plate is fixedly connected with the press counter at the position below the poking plate; the press counter is electrically connected with the power supply control box; the detection structure body comprises a rectangular seat B, a trapezoidal iron clamp, a trapezoidal groove B, a rectangular groove B, an elastic clamping piece B, a rectangular plate, a sliding rail, a clamp structure, a lock body, a gear B, a gear C, a belt wheel A, a gear D, a belt wheel B, a gear E, a cam, a cylindrical rotating shaft, a poking plate, a pressing counter and a rolling ball.
Furthermore, the size of the trapezoidal iron clamp is matched with that of the trapezoidal groove B.
Furthermore, a rectangular groove B is formed in the front end face and the rear end face of the rectangular seat B, and each rectangular groove B is internally provided with one elastic clamping piece B.
Further, when the rectangular seat A and the rectangular seat B are connected in a sliding mode and fastened and fixed through the elastic clamping piece A, the gear B is meshed with the gear A.
Further, the gear B and the gear C are meshed with each other, and the gear C is meshed with the gears.
Further, the belt wheel A and the belt wheel B are connected through a belt in a sleeved mode, and the belt wheel A rotates clockwise.
Further, when the cam rotates anticlockwise, the cam can push the poking plate to rotate clockwise, and the poking plate is contacted with the press counter.
Furthermore, the top end of the press counter is provided with the rolling ball.
Further, when the striking plate is rotated to a maximum angle by the pushing of the cam, the lock body also reaches a maximum torsion angle.
Compared with the prior art, the invention has the following beneficial effects:
according to the invention, through the matching arrangement of the gear A, the gear B, the gear C, the gear E, the cam, the toggle plate and the press counter, when the motor drives the gear A to rotate clockwise, the gear B rotates anticlockwise, the gear C rotates clockwise, the gear E rotates anticlockwise, the cam is coaxially fixed on the gear E, when the cam rotates for a circle, the cam can push the toggle plate to press the press counter to count for one time, and the counting accuracy can be enhanced.
The rectangular seats B of the two groups of detection structure main bodies can be connected and fixed through the trapezoidal iron clamps, the trapezoidal grooves B and the elastic cards B; when the rectangular seats B of the two groups of detection structure main bodies are connected and fixed, the gear D on the first group of detection structure main bodies is meshed with the gear B on the second group of detection structure main bodies, so that the second group of detection structure main bodies can be driven to operate; thirdly, because of band pulley A cup joints through the belt with band pulley B, so can guarantee that band pulley A and band pulley B carry out the syntropy and rotate, ensure that the second group detects the normal operating of structure main part.
Drawings
Fig. 1 is a schematic front view of the present invention.
Fig. 2 is a schematic front view of the two detection structure bodies of the present invention.
Fig. 3 is a rear view structural diagram of the present invention.
FIG. 4 is a schematic rear view of the two detection structure bodies of the present invention.
FIG. 5 is a schematic rear view of the two sets of detecting structural bodies of the present invention.
Fig. 6 is a schematic front view of the rectangular base a, the motor base and the gear a of the present invention.
FIG. 7 is a schematic front view of the detecting structure of the present invention.
FIG. 8 is a side view of the detection structure body of the present invention.
In the drawings, the corresponding relationship between the component names and the reference numbers is as follows:
1-rectangular seat A, 101-trapezoidal groove A, 102-rectangular groove A, 103-elastic clamping piece A, 2-motor seat, 3-motor, 4-gear A, 5-rectangular seat B, 501-trapezoidal clamping iron, 502-trapezoidal groove B, 503-rectangular groove B, 504-elastic clamping piece B, 6-rectangular plate, 7-sliding track, 8-clamp structure, 9-lock body main body, 10-gear B, 11-gear C, 12-pulley A, 13-gear D, 14-pulley B, 15-gear E, 16-cam, 17-cylindrical rotating shaft, 18-shifting plate, 19-press counter, 1901-rolling ball, 20-speed regulator and 21-power control box.
Detailed Description
The embodiments of the present invention will be described in further detail with reference to the drawings and examples. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.
In the description of the present invention, "a plurality" means two or more unless otherwise specified; the terms "upper", "lower", "left", "right", "inner", "outer", "front", "rear", "head", "tail", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are only for convenience in describing and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, should not be construed as limiting the invention. Furthermore, the terms "first," "second," "third," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "connected" and "connected" are to be interpreted broadly, e.g., as being fixed or detachable or integrally connected; can be mechanically or electrically connected; may be directly connected or indirectly connected through an intermediate. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Example (b):
as shown in figures 1 to 8:
the invention provides a lock torsion fatigue tester, comprising: the lock comprises a rectangular seat A1, a trapezoidal groove A101, a rectangular groove A102, an elastic clamping piece A103, a motor seat 2, a motor 3, a gear A4, a rectangular seat B5, a trapezoidal clamping iron 501, a trapezoidal groove B502, a rectangular groove B503, an elastic clamping piece B504, a rectangular plate 6, a sliding track 7, a clamp structure 8, a lock body main body 9, a gear B10, a gear C11, a pulley A12, a gear D13, a pulley B14, a gear E15, a cam 16, a cylindrical rotating shaft 17, a poking plate 18, a pressing counter 19, a rolling ball 1901, a speed regulator 20, a power supply control box 21 and a detection structure main body; a trapezoidal groove A101 is formed in the right end face of the rectangular seat A1, rectangular grooves A102 are formed in the front end face and the rear end face of the rectangular seat A1, and an elastic card A103 is arranged in each rectangular groove A102; the top end face of the rectangular seat A1 is welded with a motor seat 2; the top end face of the motor base 2 is fixedly connected with a motor 3, and the motor 3 is electrically connected with the speed regulator 20; a gear A4 is fixedly connected on the rotating shaft of the motor 3; a trapezoidal clamping iron 501 is arranged on the left end face of the rectangular seat B5, and a trapezoidal groove B502 is formed in the right end face of the rectangular seat B5; the front end face and the rear end face of the rectangular seat B5 are both provided with a rectangular groove B503, and each rectangular groove B503 is internally provided with an elastic card B504; a sliding track 7 is welded in the front of the top end face of the rectangular seat B5; a clamp structure 8 is connected in the sliding track 7 in a sliding way; a lock body 9 is clamped in the clamp structure 8; a rectangular plate 6 is welded on the top end face of the rectangular seat B5; (10-21 position is described with reference to fig. 3) a gear B10 is rotatably connected to the right position of the front end face of the rectangular plate 6 via a rotating shaft; the front end face of the rectangular plate 6 is positioned at the left side of the gear B10 and is rotatably connected with a gear C11 through a rotating shaft, and the front end face of the gear C11 is fixedly connected with a belt wheel A12; the front end face of the rectangular plate 6 is positioned at the left side of the gear C11 and is rotatably connected with a gear D13 through a rotating shaft, and a belt wheel B14 is fixedly connected to the gear D13; the front end face of the rectangular plate 6 is positioned below the gear C11 and is rotationally connected with a gear E15 through a rotating shaft, and a cam 16 is fixedly connected to the rotating shaft at the front side position of the gear E15; the front end face of the rectangular plate 6 is rotatably connected with a cylindrical rotating shaft 17 at the left side position of the gear E15; a poking plate 18 is fixedly connected to the front side of the outer wall of the cylindrical rotating shaft 17, and the rear end of the cylindrical rotating shaft 17 is sleeved with the lock body; a power supply control box 21 is fixedly connected to the upper position of the front end face of the motor base 2; the front end face of the motor base 2 is fixedly connected with a speed regulator 20 at a position below the power supply control box 21, and the speed regulator 20 is electrically connected with the power supply control box 21; the top end of the rectangular plate 6 is fixedly connected with a press counter 19 at the position below the toggle plate 18; the press counter 19 is electrically connected with the power control box 21; the detection structure body consists of a rectangular seat B5, a trapezoidal iron clip 501, a trapezoidal groove B502, a rectangular groove B503, an elastic card B504, a rectangular plate 6, a sliding rail 7, a clamp structure 8, a lock body 9, a gear B10, a gear C11, a pulley A12, a gear D13, a pulley B14, a gear E15, a cam 16, a cylindrical rotating shaft 17, a poking plate 18, a pressing counter 19 and a rolling ball 1901.
The trapezoidal clamping iron 501 is matched with the trapezoidal groove B502 in size, so that the rectangular seats B5 can be mutually connected in a sliding manner.
Wherein, a rectangular groove B503 is respectively arranged on the front end face and the rear end face of the rectangular seat B5, and an elastic card B504 is respectively arranged in each rectangular groove B503, so that the stability of the plurality of rectangular seats B5 during connection can be enhanced.
Wherein, when the rectangular seat A1 and the rectangular seat B5 are slidably connected with each other and are fastened and fixed by the elastic card A103, the gear B10 is meshed with the gear A4.
Wherein, gear B10 and gear C11 mesh with each other, and gear C11 meshes with each other, so when motor 3 rotates clockwise, transmission gear E15 through gear B10 and gear C11 rotates counterclockwise.
The pulley A12 and the pulley B14 are connected by a belt sleeve, and the pulley A12 rotates clockwise, so the pulley B14 also rotates clockwise.
When the cam 16 rotates counterclockwise, the cam 16 can push the toggle plate 18 to rotate clockwise, and the toggle plate 18 contacts with the push counter 19, so that one rotation of the cam 16 can perform one counting.
In this case, the rolling ball 1901 is provided at the tip of the push counter 19, so that the wear of the push counter 19 can be reduced.
Wherein when the striking plate 18 is rotated to the maximum angle by the pushing of the cam 16, the lock body 9 also reaches the maximum torsion angle.
When in use: firstly, the torsional fatigue of a single lock body 9 is detected: fixing the lock body 9 in the clamp structure 8, then pushing the clamp structure 8 to enable the lock body 9 and the cylindrical rotating shaft 17 to be mutually sleeved, then fixing the clamp structure 8, after the fixing is finished, adjusting the rotating speed of the motor 3 by using the speed regulator 20, then starting the press counter 19, at the moment, rotating the motor 3, clockwise rotating the motor 3, anticlockwise rotating the gear B10, clockwise rotating the gear C11, anticlockwise rotating the gear E15, anticlockwise rotating the gear E15, anticlockwise rotating the cam 16, when anticlockwise rotating the cam 16, pushing the poking plate 18 to clockwise rotate, and touching the poking plate 18 and the press counter 19, so that once counting can be carried out by one rotation of the cam 16, and finally obtaining a result by observing and recording the number on the press counter 19 when the lock body 9 reaches a fatigue point;
the torsional fatigue of the plurality of lock body main bodies 9 is detected: as shown in the third drawing, another group of detection structure body is connected on the left side of the detection structure body at first, two groups of detection structure bodies are connected with each other in a sliding manner through a trapezoidal clamping iron 501 and a trapezoidal groove B502, and are fixed through an elastic clamping piece B504, after the two groups of detection structure bodies are fixed, a gear D13 on the first group of detection structure body is meshed with a gear B10 on the second group of detection structure body, so that the motor 3 can drive the two groups of detection structure bodies to simultaneously detect, and other groups of lock bodies 9 can be simultaneously detected according to the method.
The embodiments of the present invention have been presented for purposes of illustration and description, and are not intended to be exhaustive or limited to the invention in the form disclosed. Many modifications and variations will be apparent to those of ordinary skill in the art. The embodiment was chosen and described in order to best explain the principles of the invention and the practical application, and to enable others of ordinary skill in the art to understand the invention for various embodiments with various modifications as are suited to the particular use contemplated.
Claims (5)
1. Tool to lock torsional fatigue degree testing machine, its characterized in that: this tool to lock torsional fatigue degree testing machine includes: the detection device comprises a rectangular seat A (1), a trapezoidal groove A (101), a rectangular groove A (102), an elastic card A (103), a motor seat (2), a motor (3), a gear A (4) and a detection structure main body; the detection structure body consists of a rectangular seat B (5), a trapezoidal iron clamp (501), a trapezoidal groove B (502), a rectangular groove B (503), an elastic clamp B (504), a rectangular plate (6), a sliding rail (7), a clamp structure (8), a lock body (9), a gear B (10), a gear C (11), a belt wheel A (12), a gear D (13), a belt wheel B (14), a gear E (15), a cam (16), a cylindrical rotating shaft (17), a poking plate (18), a press counter (19) and a rolling ball (1901); the right end face of the rectangular seat A (1) is provided with one trapezoid groove A (101), the front end face and the rear end face of the rectangular seat A (1) are provided with one rectangular groove A (102), and each rectangular groove A (102) is internally provided with one elastic clamping piece A (103); the top end face of the rectangular seat A (1) is welded with the motor seat (2); the top end face of the motor base (2) is fixedly connected with the motor (3), and the motor (3) is electrically connected with the speed regulator (20); the rotating shaft of the motor (3) is fixedly connected with the gear A (4); a trapezoidal clamping iron (501) is arranged on the left end face of the rectangular seat B (5), and a trapezoidal groove B (502) is formed in the right end face of the rectangular seat B (5); a rectangular groove B (503) is formed in the front end face and the rear end face of the rectangular seat B (5), and an elastic clamping piece B (504) is arranged in each rectangular groove B (503); the sliding rail (7) is welded in the front of the top end face of the rectangular seat B (5); the sliding track (7) is internally and slidably connected with the clamp structure (8); the clamp structure (8) clamps one lock body (9) therein; the top end face of the rectangular seat B (5) is welded with the rectangular plate (6); the right side position of the front end face of the rectangular plate (6) is rotationally connected with a gear B (10) through a rotating shaft; the front end face of the rectangular plate (6) is positioned at the left side of the gear B (10) and is rotationally connected with a gear C (11) through a rotating shaft, and the front end face of the gear C (11) is fixedly connected with a belt wheel A (12); the front end face of the rectangular plate (6) is positioned at the left side of the gear C (11) and is rotationally connected with a gear D (13) through a rotating shaft, and the gear D (13) is fixedly connected with a belt wheel B (14); the front end face of the rectangular plate (6) is positioned below the gear C (11) and is rotationally connected with a gear E (15) through a rotating shaft, and the rotating shaft is also fixedly connected with a cam (16) positioned at the front side of the gear E (15); the front end face of the rectangular plate (6) is rotatably connected with one cylindrical rotating shaft (17) at the left side position of the gear E (15); the poking plate (18) is fixedly connected to the front side of the outer wall of the cylindrical rotating shaft (17), and the rear end of the cylindrical rotating shaft (17) is sleeved with the lock body; a power supply control box (21) is fixedly connected to the upper position of the front end face of the motor base (2); the front end face of the motor base (2) is fixedly connected with the speed regulator (20) at a position below the power supply control box (21), and the speed regulator (20) is electrically connected with the power supply control box (21); the top end of the rectangular plate (6) is fixedly connected with the press counter (19) at the position below the poking plate (18); the pressing counter (19) is electrically connected with the power control box (21), the rolling ball (1901) is arranged at the top end of the pressing counter (19), and when the rectangular seat A (1) and the rectangular seat B (5) are mutually connected in a sliding manner and are buckled and fixed through the elastic clamping piece A (103), the gear B (10) and the gear A (4) are mutually meshed; the gear B (10) and the gear C (11) are meshed with each other, the gear C (11) is meshed with the gear E (15), when the cam (16) rotates anticlockwise, the cam (16) can push the poking plate (18) to rotate clockwise, and the poking plate (18) is contacted with the pressing counter (19).
2. The lock torsional fatigue tester of claim 1, wherein: the size of the trapezoidal clamping iron (501) is matched with that of the trapezoidal groove B (502).
3. The lock torsional fatigue tester of claim 1, wherein: a rectangular groove B (503) is formed in the front end face and the rear end face of the rectangular seat B (5), and each rectangular groove B (503) is internally provided with one elastic clamping piece B (504).
4. The lock torsional fatigue tester of claim 1, wherein: the belt wheel A (12) and the belt wheel B (14) are connected through a belt in a sleeved mode, and the belt wheel A (12) rotates clockwise.
5. The lock torsional fatigue tester of claim 1, wherein: when the poke plate (18) is pushed by the cam (16) to rotate to the maximum angle, the lock body main body (9) also reaches the maximum torsion angle.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811460064.4A CN109374453B (en) | 2018-11-30 | 2018-11-30 | Lock torsion fatigue testing machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811460064.4A CN109374453B (en) | 2018-11-30 | 2018-11-30 | Lock torsion fatigue testing machine |
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| CN109374453A CN109374453A (en) | 2019-02-22 |
| CN109374453B true CN109374453B (en) | 2021-01-22 |
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| CN201811460064.4A Active CN109374453B (en) | 2018-11-30 | 2018-11-30 | Lock torsion fatigue testing machine |
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| CN207408087U (en) * | 2017-10-31 | 2018-05-25 | 江苏力高检测设备有限公司 | Torsion tester |
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| CN2727729Y (en) * | 2004-03-19 | 2005-09-21 | 株洲时代新材料科技股份有限公司 | Automobile air spring fatigue-testing machine |
| CN101216399A (en) * | 2008-01-22 | 2008-07-09 | 天津金山电线电缆股份有限公司 | Cable torsion reliability experiment instrument |
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Also Published As
| Publication number | Publication date |
|---|---|
| CN109374453A (en) | 2019-02-22 |
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