CN109580203A - A kind of test machine and its working method emulating friction pulley load running - Google Patents
A kind of test machine and its working method emulating friction pulley load running Download PDFInfo
- Publication number
- CN109580203A CN109580203A CN201811591467.2A CN201811591467A CN109580203A CN 109580203 A CN109580203 A CN 109580203A CN 201811591467 A CN201811591467 A CN 201811591467A CN 109580203 A CN109580203 A CN 109580203A
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- China
- Prior art keywords
- friction pulley
- main shaft
- stud
- rectangular frame
- support base
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
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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
Abstract
The invention discloses a kind of test machines for emulating friction pulley load running, including test-bed, driving motor, transmission chain, first friction pulley, second friction pulley, one group of first rotating shaft support base, first rotating shaft, main shaft, one group of first main shaft support seat, pressure sensor and display, the first rotating shaft is fixed at the center of the first friction pulley, outside the circumference of the outer circumferential edges of first friction pulley and the second friction pulley be bonded, and the first friction pulley is located at below the second friction pulley, the main shaft is connect by first bearing with the second friction pulley, the both ends of the main shaft are arranged on the first main shaft support seat, the first main shaft support seat is arranged on test-bed, the first main shaft support seat is symmetricly set on the two sides of the second friction pulley, the pressure sensor is arranged in the first main shaft support seat, and Pressure sensor is fitted on the end face of main shaft, and the display and pressure sensor are electrically connected.
Description
Technical field
The invention belongs to the field of manufacturing, in particular to a kind of test machine for emulating friction pulley load running.The present invention
Further relate to a kind of working method of test machine for emulating friction pulley load running.
Background technique
In escalator or moving sidewalk, it is necessary to assure handrail is run smooth and smooth, is not allow for sideslip
Phenomenon.Friction pulley is the important component on staircase, if defective in quality will lead to very big accident, so to production friction pulley
Selective examination checks that its abrasion condition is necessary after carrying out simulation run.
Summary of the invention
Goal of the invention: in order to overcome the above deficiency, the object of the present invention is to provide a kind of emulation friction pulley load runnings
Test machine, structure is simple, and design rationally, can continuously test friction pulley.The present invention also provides a kind of emulation frictions
The working method of the test machine of load running is taken turns, working principle is simple and easy, and the course of work is easily achieved.
Technical solution: it is a kind of emulate friction pulley load running test machine, including test-bed, driving motor, transmission chain,
First friction pulley, the second friction pulley, one group of first rotating shaft support base, first rotating shaft, main shaft, one group of first main shaft support seat, pressure
Force snesor and display, the driving motor are connect by transmission chain with first rotating shaft, and the first rotating shaft is fixed at
The center of first friction pulley, the outer circumferential edges of first friction pulley with outside the circumference of the second friction pulley be bonded,
And the first friction pulley is located at below the second friction pulley, and the first main shaft support seat is arranged on test-bed, and described one group
First rotating shaft support base is set as 2, and one group of first rotating shaft support base is symmetricly set on the two sides of the first friction pulley, described
The center of second friction pulley is equipped with first bearing, and the main shaft is connect by first bearing with the second friction pulley, the master
The both ends of axis are arranged on the first main shaft support seat, and the first main shaft support seat is set as two, and the first main shaft branch
It supports seat to be arranged on test-bed, the first main shaft support seat is symmetricly set on the two sides of the second friction pulley, and the pressure passes
Sensor is arranged in the first main shaft support seat, and pressure sensor is fitted on the end face of main shaft, the display and pressure
Sensor is electrically connected.
The test machine of emulation friction pulley load running of the invention, can uninterruptedly be carried out using true hardware friction pulley
Continuous spin friction test, is able to carry out the testing inspections such as fatigue, service life, and test data is accurate, tests process visualization, just
Variation in grasp friction pulley stress use process at any time.
Further, the test machine of above-mentioned emulation friction pulley load running, the test-bed includes lower bottom base, first
Rectangular frame, second rectangular frame and one group of support rod, the first rectangular frame and second rectangular frame are vertically arranged in down
On pedestal, the driving motor is arranged on lower bottom base, and the support rod is horizontally set on first rectangular frame and the second rectangle
In frame, and support rod is in the middle position in first rectangular frame and second rectangular frame, the first rotating shaft support
Seat is arranged on the upper surface of support rod, and first friction pulley and the second friction pulley are in first rectangular frame and the second rectangle
Between frame, the display is arranged in first rectangular frame or second rectangular frame.
Further, the test machine of above-mentioned emulation friction pulley load running, the first main shaft support seat include support
Seat ontology, the first stud, the second stud, the first clamping screw, the second clamping screw and pressure plate, first stud and second
The lower end of stud is arranged on support base ontology, and the support base ontology is bolted on first rectangular frame and second
On rectangular frame, the both ends of the main shaft are arranged on support base ontology, and main shaft be located at the first stud and the second stud it
Between, the pressure plate is set in the upper end of the first stud and the second stud, and main shaft can be pressed on support base by pressure plate
On ontology, the pressure sensor is arranged on pressure plate, and first clamping screw and the second clamping screw are respectively with first
Stud and the second stud are threadedly coupled, and pressure plate can be pressed on main shaft by first clamping screw and the second clamping screw.
Further, the test machine of above-mentioned emulation friction pulley load running, it is recessed that the support base ontology is equipped with first
Slot, the section of first groove are arc, and the both ends of the main shaft are arranged in the first groove.
Further, the test machine of above-mentioned emulation friction pulley load running, the support base ontology is far from the second friction
The end face of wheel is equipped with first baffle, and the first baffle is located at the first groove.
Further, the test machine of above-mentioned emulation friction pulley load running, the connection of the main shaft and the second friction pulley
Place is equipped with bearing.
Further, the test machine of above-mentioned emulation friction pulley load running covers on first stud and the second stud
Equipped with spring, the spring is located between the upper surface of support base ontology and the lower end surface of pressure plate, first stud and
Two studs are symmetricly set on the two sides of main shaft.
The present invention also provides a kind of working methods of test machine for emulating friction pulley load running, comprising the following steps:
1) position for adjusting the first clamping screw and the second clamping screw and the first stud and the second stud adjusts pressure plate and compresses
Pressing force on main shaft；
2) pressure sensor measures pressure value, and shows over the display, and pressure value is adjusted to setting value, by the first locking screw
Bolt and the locking of the second clamping screw；
3) driving motor starts, and driving motor drives first rotating shaft to rotate by transmission chain；
4) first rotating shaft drives the first friction wheel from rotation；
5) the first friction pulley checks the first friction pulley by the second friction wheel from rotation of frictional force drives between the second friction pulley
It is operated with the second friction pulley；
6) duration of runs is set over the display, reaches setting value, and driving motor is shut down, and the first friction pulley and the second friction pulley stop
It only operates, checks whether the first friction pulley and the second friction pulley reach quality requirement.
The working method of the test machine of emulation friction pulley load running of the present invention, working principle is simple and easy, if
The test structure set meets true application environment, improves the accuracy of detection data.
Above-mentioned technical proposal can be seen that the invention has the following beneficial effects: emulation friction pulley of the present invention is negative
The test machine of carrying row, structure is simple, and design rationally, is readily produced.The test machine of emulation friction pulley load running simulates
The applying working condition of true friction pulley is able to carry out continuous continual experimental test, can freely set to time and pressure
It is fixed, it is flexible and convenient to use, conveniently check the stress in friction pulley operation process, and can check the abrasion feelings using rear friction pulley
Condition.
Detailed description of the invention
Fig. 1 is the main view of the test machine of emulation friction pulley load running of the present invention；
Fig. 2 is the right view of the test machine of emulation friction pulley load running of the present invention；
Fig. 3 is the partial enlarged view in Fig. 2 of the present invention at A；
Fig. 4 is the operation principle schematic diagram of staircase friction pulley of the present invention.
In figure: test-bed 1, lower bottom base 11, first rectangular frame 12, second rectangular frame 13, support rod 14, driving electricity
Machine 2, transmission chain 3, the first friction pulley 4, the second friction pulley 5, first bearing 51, first rotating shaft support base 6, first rotating shaft 7, main shaft
8, the first main shaft support seat 9, support base ontology 91, the first groove 911, first baffle 912, the first stud 92, the second stud 93,
First clamping screw 94, the second clamping screw 95, pressure plate 96, spring 97, pressure sensor 10, friction pulley 20, display 30,
Handrail 40.
Specific embodiment
The embodiment of the present invention is described below in detail, examples of the embodiments are shown in the accompanying drawings, wherein from beginning to end
Same or similar label indicates same or similar element or element with the same or similar functions.Below with reference to attached
The embodiment of figure description is exemplary, it is intended to is used to explain the present invention, and is not considered as limiting the invention.
In the description of the present invention, it is to be understood that, term " center ", " longitudinal direction ", " transverse direction ", " length ", " width ",
" thickness ", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom" "inner", " clockwise ", " inverse
The orientation or positional relationship of the instructions such as hour hands " is to be based on the orientation or positional relationship shown in the drawings, and is merely for convenience of description originally
Invention and simplified description, rather than the device or element of indication or suggestion meaning must have a particular orientation, with specific side
Position construction and operation, therefore be not considered as limiting the invention.
In addition, term " first ", " second " are used for descriptive purposes only and cannot be understood as indicating or suggesting relative importance
Or implicitly indicate the quantity of indicated technical characteristic.Define " first " as a result, the feature of " second " can be expressed or
Implicitly include one or more of the features.In the description of the present invention, unless otherwise indicated, the meaning of " plurality " is two
It is a or more than two, unless otherwise restricted clearly.
In the present invention unless specifically defined or limited otherwise, term " installation ", " connected ", " connection ", " fixation " etc.
Term shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or be integrally connected；It can be machine
Tool connection, is also possible to be electrically connected；It can be directly connected, two members can also be can be indirectly connected through an intermediary
Connection inside part.For the ordinary skill in the art, above-mentioned term can be understood in this hair as the case may be
Concrete meaning in bright.
In the present invention unless specifically defined or limited otherwise, fisrt feature second feature "upper" or "lower"
It may include that the first and second features directly contact, also may include that the first and second features are not direct contacts but pass through it
Between other characterisation contact.Moreover, fisrt feature includes the first spy above the second feature " above ", " above " and " above "
Sign is right above second feature and oblique upper, or is merely representative of first feature horizontal height higher than second feature.Fisrt feature exists
Second feature " under ", " lower section " and " following " include that fisrt feature is directly below and diagonally below the second feature, or is merely representative of
First feature horizontal height is less than second feature.
Embodiment
The test machine of emulation friction pulley load running as shown in Figs. 1-3, including test-bed 1, driving motor 2, transmission
8, one groups of chain 3, the first friction pulley 4,5, one groups of first rotating shaft support bases 6 of the second friction pulley, first rotating shaft 7, main shaft first main shafts
Support base 9, pressure sensor 10 and display 30, the driving motor 2 are connect by transmission chain 3 with first rotating shaft 7, and described the
One shaft 7 is fixed at the center of the first friction pulley 4, the outer circumferential edges of first friction pulley 4 and the second friction
Outside the circumference of wheel 5 be bonded, and the first friction pulley 4 is located at below the second friction pulley 5, and the first main shaft support seat 9 is set
It sets on test-bed 1, one group of first rotating shaft support base 6 is set as 2, and one group of first rotating shaft support base 6 is symmetrical
The two sides of first friction pulley 4 are set, and the center of second friction pulley 5 is equipped with first bearing 51, and the main shaft 8 passes through
First bearing 51 is connect with the second friction pulley 5, and the both ends of the main shaft 8 are arranged on the first main shaft support seat 9, and described first
Main shaft support seat 9 is set as two, and the first main shaft support seat 9 is arranged on test-bed 1, the first main shaft support seat
9 are symmetricly set on the two sides of the second friction pulley 5, and the pressure sensor 10 is arranged in the first main shaft support seat 9, and pressure
Sensor 10 is fitted on the end face of main shaft 8, and the display 30 is electrically connected with pressure sensor 10.Also, the first stud
92 and second are arranged with spring 97 on stud 93, and the spring 97 is located under upper surface and the pressure plate 96 of support base ontology 91
Between end face, first stud 92 and the second stud 93 are symmetricly set on the two sides of main shaft 8.
Wherein, test-bed 1 includes lower bottom base 11, first rectangular frame 12, second rectangular frame 13 and one group of support rod
14, the first rectangular frame 12 and second rectangular frame 13 are vertically arranged on lower bottom base 11, and the setting of driving motor 2 exists
On lower bottom base 11, the support rod 14 is horizontally set in first rectangular frame 12 and second rectangular frame 13, and support rod
14 middle position in first rectangular frame 12 and second rectangular frame 13, the setting of first rotating shaft support base 6 are being propped up
On the upper surface of strut 14, first friction pulley 4 and the second friction pulley 5 are in first rectangular frame 12 and second rectangular frame
Between 13, the display 30 is arranged in first rectangular frame 12 or second rectangular frame 13.In addition, the first main shaft support seat
9 include support base ontology 91, the first stud 92, the second stud 93, the first clamping screw 94, the second clamping screw 95 and pressure plate
96, on support base ontology 91, the support base ontology 91 is logical for the lower end setting of first stud 92 and the second stud 93
It crosses bolt to be fixed in first rectangular frame 12 and second rectangular frame 13, the both ends of the main shaft 8 are arranged in support base ontology
On 91, and main shaft 8, between the first stud 92 and the second stud 93, the pressure plate 96 is set in the first stud 92 and
The upper end of two studs 93, and main shaft 8 can be pressed on support base ontology 91 by pressure plate 96, and the pressure sensor 10 is set
Set on pressure plate 96, first clamping screw 94 and the second clamping screw 95 respectively with the first stud 92 and the second stud 93
It is threadedly coupled, pressure plate 96 can be pressed on main shaft 8 by first clamping screw 94 and the second clamping screw 95.Pass through compression
Plate 96 compresses main shaft 8, since main shaft 8 is connect with the second friction pulley 5, may make the lower edge and the of the second friction pulley 5
The upper end-face edge that one friction pulley 4 is in contact is tightly pressed against together, in 4 rotation process of the first friction pulley, in the first friction pulley 4 and
Under the effect of two friction pulleys, 5 frictional force, the second friction pulley 5 is rotated with it.
In addition, support base ontology 91 is equipped with the first groove 911, the section of first groove 911 is arc, the master
The both ends of axis 8 are arranged in the first groove 911.Support base ontology 91 is equipped with first gear far from the end face of the second friction pulley 5
Plate 912, the first baffle 912 are located at the first groove 911.The junction of main shaft 8 and the second friction pulley 5 is equipped with bearing.
A kind of working method of the test machine of emulation friction pulley load running of the invention, comprising the following steps:
1) position for adjusting the first clamping screw 94 and the second clamping screw 95 and the first stud 92 and the second stud 93, adjusts pressure
Tight plate 96 is pressed on the pressing force on main shaft 8；
2) pressure sensor 10 measures pressure value, and shows on the display 30, and pressure value is adjusted to setting value, by the first lock
Tight bolt 94 and the locking of the second clamping screw 95；
3) driving motor 2 starts, and driving motor 2 drives first rotating shaft 7 to rotate by transmission chain 3；
4) first rotating shaft 7 drives the rotation of the first friction pulley 4；
5) the first friction pulley 4 is rotated by the second friction pulley of frictional force drives 5 between the second friction pulley 5, checks that first rubs
It wipes wheel 4 and the second friction pulley 5 operates；
6) duration of runs is set on the display 30, reaches setting value, and driving motor 2 is shut down, the first friction pulley 4 and the second friction
Wheel 5 shuts down, and checks whether the first friction pulley 4 and the second friction pulley 5 reach quality requirement.
The effect of friction pulley 20 as shown in Figure 4 is exactly to reach the same goal by rotation and compress the frictional force generated with handrail 40, is driven
The handrail 40 of staircase rotates.
The above is only a preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art
For member, without departing from the principle of the present invention, several improvement can also be made, these improvement also should be regarded as of the invention
Protection scope.
Claims (8)
1. it is a kind of emulate friction pulley load running test machine, it is characterised in that: including test-bed (1), driving motor (2),
Transmission chain (3), the first friction pulley (4), the second friction pulley (5), one group of first rotating shaft support base (6), first rotating shaft (7), main shaft
(8), one group of first main shaft support seat (9), pressure sensor (10) and display (30), the driving motor (2) pass through transmission
Chain (3) is connect with first rotating shaft (7), and the first rotating shaft (7) is fixed at the center of the first friction pulley (4), described
Outside the circumference of the outer circumferential edges of first friction pulley (4) and the second friction pulley (5) be bonded, and the first friction pulley (4) position
Below the second friction pulley (5), the first main shaft support seat (9) is arranged on test-bed (1), one group of first rotating shaft
Support base (6) is set as 2, and one group of first rotating shaft support base (6) is symmetricly set on the two sides of the first friction pulley (4), institute
The center for stating the second friction pulley (5) is equipped with first bearing (51), and the main shaft (8) is rubbed by first bearing (51) with second
Wheel (5) connection is wiped, the both ends of the main shaft (8) are arranged on the first main shaft support seat (9), the first main shaft support seat
(9) two are set as, and the first main shaft support seat (9) is arranged on test-bed (1), the first main shaft support seat (9)
The two sides of the second friction pulley (5) are symmetricly set on, pressure sensor (10) setting is interior in the first main shaft support seat (9), and
And pressure sensor (10) is fitted on the end face of main shaft (8), the display (30) and pressure sensor (10) are electrically connected.
2. the test machine of emulation friction pulley load running according to claim 1, it is characterised in that: the test-bed
It (1) include lower bottom base (11), first rectangular frame (12), second rectangular frame (13) and one group of support rod (14), described first
Rectangular frame (12) and second rectangular frame (13) are vertically arranged on lower bottom base (11), and the driving motor (2) is arranged under
On pedestal (11), the support rod (14) is horizontally set in first rectangular frame (12) and second rectangular frame (13), and
Support rod (14) is in the middle position in first rectangular frame (12) and second rectangular frame (13), the first rotating shaft support
Seat (6) is arranged on the upper surface of support rod (14), and first friction pulley (4) and the second friction pulley (5) are in the first rectangle
Between frame (12) and second rectangular frame (13), the display (30) is arranged in first rectangular frame (12) or the second rectangle
On frame (13).
3. the test machine of emulation friction pulley load running according to claim 1, it is characterised in that: the first main shaft branch
Support seat (9) includes support base ontology (91), the first stud (92), the second stud (93), the first clamping screw (94), the second locking
The lower end of bolt (95) and pressure plate (96), first stud (92) and the second stud (93) is arranged in support base ontology
(91) on, the support base ontology (91) is bolted in first rectangular frame (12) and second rectangular frame (13),
The both ends of the main shaft (8) are arranged on support base ontology (91), and main shaft (8) is located at the first stud (92) and the second stud
(93) between, the pressure plate (96) is set in the upper end of the first stud (92) and the second stud (93), and pressure plate
(96) main shaft (8) can be pressed on support base ontology (91), the pressure sensor (10) is arranged on pressure plate (96), institute
It states the first clamping screw (94) and the second clamping screw (95) is threadedly coupled with the first stud (92) and the second stud (93) respectively,
Pressure plate (96) can be pressed on main shaft (8) by first clamping screw (94) and the second clamping screw (95).
4. the test machine of emulation friction pulley load running according to claim 3, it is characterised in that: the support base ontology
(91) the first groove (911) are equipped with, the section of first groove (911) is arc, and the both ends of the main shaft (8) are arranged
In the first groove (911).
5. the test machine of emulation friction pulley load running according to claim 4, it is characterised in that: the support base ontology
(91) end face far from the second friction pulley (5) is equipped with first baffle (912), and it is recessed that the first baffle (912) is located at first
At slot (911).
6. it is according to claim 5 emulation friction pulley load running test machine, it is characterised in that: the main shaft (8) with
The junction of second friction pulley (5) is equipped with bearing.
7. the test machine of emulation friction pulley load running according to claim 6, it is characterised in that: first stud
(92) and on the second stud (93) it is arranged with spring (97), the spring (97) is located at upper surface and the pressure of support base ontology (91)
Between the lower end surface of tight plate (96), first stud (92) and the second stud (93) are symmetricly set on the two sides of main shaft (8).
8. the working method of the test machine of emulation friction pulley load running according to claim 7, it is characterised in that: including
Following steps:
1) position of the first clamping screw (94) and the second clamping screw (95) and the first stud (92) and the second stud (93) is adjusted
It sets, adjusts pressure plate (96) and be pressed on the pressing force on main shaft (8)；
2) pressure sensor (10) measures pressure value, and shows on display (30), and pressure value is adjusted to setting value, by
One clamping screw (94) and the second clamping screw (95) locking；
3) driving motor (2) starts, and driving motor (2) drives first rotating shaft (7) rotation by transmission chain (3)；
4) first rotating shaft (7) drives the first friction pulley (4) rotation；
5) the first friction pulley (4) is rotated by the second friction pulley of frictional force drives (5) between the second friction pulley (5), is checked
First friction pulley (4) and the second friction pulley (5) operating；
6) duration of runs is set on display (30), reaches setting value, driving motor (2) is shut down, the first friction pulley (4) and the
Two friction pulleys (5) shut down, and check whether the first friction pulley (4) and the second friction pulley (5) reach quality requirement.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811591467.2A CN109580203A (en) | 2018-12-25 | 2018-12-25 | A kind of test machine and its working method emulating friction pulley load running |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811591467.2A CN109580203A (en) | 2018-12-25 | 2018-12-25 | A kind of test machine and its working method emulating friction pulley load running |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109580203A true CN109580203A (en) | 2019-04-05 |
Family
ID=65932541
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811591467.2A Pending CN109580203A (en) | 2018-12-25 | 2018-12-25 | A kind of test machine and its working method emulating friction pulley load running |
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| Country | Link |
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| CN (1) | CN109580203A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111141510A (en) * | 2020-03-09 | 2020-05-12 | 吉林大学 | Force reducing performance test bench for friction wheel type winch force reducing mechanism |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203083819U (en) * | 2013-03-20 | 2013-07-24 | 宁波市鸿腾机电有限公司 | Idler wheel testing apparatus |
| CN203881531U (en) * | 2014-06-06 | 2014-10-15 | 巨人通力电梯有限公司 | Wheel fatigue test device |
| CN203940988U (en) * | 2014-06-13 | 2014-11-12 | 广州广日电梯工业有限公司 | The step roller test unit of escalator |
| CN205607628U (en) * | 2016-01-05 | 2016-09-28 | 广州广日电梯工业有限公司 | Automatic escalator step chain gyro wheel fatigue life test device |
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2018
- 2018-12-25 CN CN201811591467.2A patent/CN109580203A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203083819U (en) * | 2013-03-20 | 2013-07-24 | 宁波市鸿腾机电有限公司 | Idler wheel testing apparatus |
| CN203881531U (en) * | 2014-06-06 | 2014-10-15 | 巨人通力电梯有限公司 | Wheel fatigue test device |
| CN203940988U (en) * | 2014-06-13 | 2014-11-12 | 广州广日电梯工业有限公司 | The step roller test unit of escalator |
| CN205607628U (en) * | 2016-01-05 | 2016-09-28 | 广州广日电梯工业有限公司 | Automatic escalator step chain gyro wheel fatigue life test device |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111141510A (en) * | 2020-03-09 | 2020-05-12 | 吉林大学 | Force reducing performance test bench for friction wheel type winch force reducing mechanism |
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Application publication date: 20190405 |