CN109095244A - A kind of novel deflector roll friction gearing - Google Patents
A kind of novel deflector roll friction gearing Download PDFInfo
- Publication number
- CN109095244A CN109095244A CN201811271923.5A CN201811271923A CN109095244A CN 109095244 A CN109095244 A CN 109095244A CN 201811271923 A CN201811271923 A CN 201811271923A CN 109095244 A CN109095244 A CN 109095244A
- Authority
- CN
- China
- Prior art keywords
- deflector roll
- female connector
- middle transition
- passive
- transition female
- 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.)
- Pending
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H20/00—Advancing webs
- B65H20/02—Advancing webs by friction roller
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H23/00—Registering, tensioning, smoothing or guiding webs
- B65H23/04—Registering, tensioning, smoothing or guiding webs longitudinally
- B65H23/26—Registering, tensioning, smoothing or guiding webs longitudinally by transverse stationary or adjustable bars or rollers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H2701/00—Handled material; Storage means
- B65H2701/10—Handled articles or webs
- B65H2701/11—Dimensional aspect of article or web
- B65H2701/113—Size
- B65H2701/1133—Size of webs
Landscapes
- Friction Gearing (AREA)
Abstract
The present invention relates to a kind of novel deflector roll friction gearings, which is characterized in that including alternating current generator and the speed reducer driven by the alternating current generator, the speed reducer drives passive and synchronous wheel to rotate by the active synchronization wheel；The passive and synchronous wheel drives deflector roll rotation by middle transition female connector, setting drives the friction gearing of the middle transition female connector operating between the middle transition female connector and passive and synchronous wheel, middle transition female connector one end is provided with the compacting ring being fixed on the middle transition female connector on deflector roll, elastic device is provided in the compacting ring, the elastic device presses to the compacting ring, middle transition female connector, realizes the contact force between friction gearing and passive and synchronous wheel, deflector roll.The present invention provides a kind of transmission tension stabilities, and deflector roll running precision is high, and front and back deflector roll net synchronization capability is good, output torque and the adjustable novel deflector roll drive technology of revolving speed.
Description
Technical field
The present invention relates to the technical fields such as weaving, printing and dyeing, chemical industry, food, papermaking, process hides, plastics, more particularly to weave,
The deflector roll transmission technical field of fabric transmission is carried out in dyeing industry using deflector roll.
Background technique
Transmitting fabric with the deflector roll of all kinds of diameters in weaving, dyeing is a kind of using very extensive method, is led
Roller, which not only provides, transports the power that fabric advances, but also the supporting element for changing operating path is back and forth connected as fabric, it is for guaranteeing
The normal operation of fabric has highly important influence.Especially be made of several deflector rolls and several gear units it is continuous flat
In the long fare of width operation, the transmission control technology of deflector roll even more directly determines the transmission performance of full machine.
The kind of drive that existing deflector roll transmission relatively mostly uses has: 1, torque motor is driven on deflector roll by " V " type rubber strip
Follower transmission；2, torque motor is driven by " V " type rubber strip through intermediate friction transmission device passive on deflector roll again
Wheel transmission；3, alternating current generator speed reducer drives the follower transmission on deflector roll by " V " type rubber strip；4, alternating current generator speed reducer
Deflector roll direct-connection transmission etc. is driven by shaft coupling.Because there is following some limitations in the above-mentioned various kinds of drive, it is difficult to full
Guarantee the requirement of fabric low-tension synchronous operation in the more deflector rolls of foot, multiple-unit tinuous production.
1, torque motor " V " type rubber strip driving form:
Torque motor is only the permanent torque mechanical property using torque motor, one by " V " type rubber strip idle guide rolls
A low-force square being held essentially constant is exported in a relatively narrow nominal speed range, but for deflector roll each in multiple-unit
Diameter is different, and the inconsistent complex situations of Tensity size, only the constant torque characteristic single with torque motor, cannot reach multiple-unit
The requirement of Synchronous Transmission.
2, torque motor " V " type rubber strip is through intermediate friction drive form:
Although the friction gearing among the driving form is more than the form with torque motor " V " type rubber V belt translation, can
To be adjusted in a certain range to the output torque of torque motor；But still by the torque motor range of speeds and defeated
The influence of torque out, big to front and back deflector roll diameter change in the transmission of more deflector rolls, tension variation is big, and high low speed, which is run into speed difference, to be changed
Big situation is not still able to satisfy the requirement of low-tension Synchronous Transmission.And intermediate friction device first is reached from torque motor,
Rubbed device reaches deflector roll again, drive mechanism need to be kept excessively complicated, loose, be unfavorable for the accurate, tight of equipment through secondary transmission
Gather design.
3, alternating current generator speed reducer " V " type rubber strip driving form:
Compared with torque motor transmission, the benefit of alternating current generator speed reducer drive is that transmitting torque is relatively large, by selecting not
Same speed reducer speed ratio can export the revolving speed that various deflector rolls need.But since three phase alternating current motor output mechanical property is harder,
Output torque and revolving speed will not synchronize variation because of curvedization of deflector roll load；And in multiple groups transmission, due to by three-phase motor
The different influence of power factor (PF), the output revolving speed of three-phase motor is not fully consistent in each gear unit, causes each gear unit
There are small speed differences for the linear velocity of middle deflector roll, the inconsistent of fabric front-and-back unit tension are caused after operation accumulation, to influence
The synchronous running accuracy of fabric.
And above-mentioned three kinds of kinds of drive are using common " V " shape rubber V belt translation, it is low that there are transmission accuracies, is meeting speed
The sliding phenomenon that can generate between adhesive tape and belt wheel when rapidly changing of degree influences the synchronous operation and positioning accuracy of deflector roll.
4, alternating current generator speed reducer shaft coupling direct-connection transmission form
There are identical shortcomings with above-mentioned 3rd kind of driving form for the driving form, only without main passive belt wheel and " V " shape
Band keeps drive mechanism more compact.But since shaft coupling is rigid connection, the motor output shaft in electric motor starting and stopped process
Hard impact is formed between deflector roll spindle nose, easily causes the abrasion of spindle nose and shaft coupling and the damage of motor bearings.
Summary of the invention
The present invention provides one kind and overcomes drawbacks described above, is driven tension stability, deflector roll running precision is high, front and back deflector roll synchronism
It can good, output torque and the adjustable novel deflector roll drive technology of revolving speed.
The technical scheme is that a kind of novel deflector roll friction gearing, including alternating current generator (1) and by described
The speed reducer (2) that alternating current generator (1) drives, the speed reducer (2) drive passive and synchronous wheel by the active synchronization wheel (3)
(5) it rotates；
The passive and synchronous wheel (5) drives deflector roll (10) rotation, the middle transition female connector (7) by middle transition female connector (7)
Setting drives the friction gearing of middle transition female connector (7) operating, the middle transition between passive and synchronous wheel (5)
Female connector (7) one end is provided with the compacting ring (16) being fixed on the middle transition female connector (7) on deflector roll (10), the compacting ring
(6) it is provided with elastic device in, the elastic device presses to the compacting ring (16), middle transition female connector (7), realizes
Contact force between friction gearing and passive and synchronous wheel (5), deflector roll (10).
The middle transition female connector (7) forms the annular convex platform of indent, sets on middle transition female connector (7) the side outer ring
Be equipped with the compacting ring (16) the middle transition female connector (7) being pressed on the deflector roll (10)；
The indent annular convex platform that the compacting ring (16) and the middle transition female connector (7) are formed forms the passive and synchronous wheel
(5) space disposed.
The friction gearing includes being arranged to contact rubbing for side in passive and synchronous wheel (5) and middle transition female connector (7)
Pad (11), setting contact the friction plate (11) of side, and setting in passive and synchronous wheel (5) and compacting ring (16) passive same
Friction sleeve (12) between the inner ring and middle transition set (7) outer ring of step wheel (5).
The elastic device is arranged within the cavity of compacting ring (16), and the elastic device includes and the compacting ring
(16), the compressed spring (15) of middle transition female connector (7) side contact；The outside of the compressed spring (15) is contradicted in retaining ring
(17) on, the retaining ring (17) is driven the adjusting for realizing compressed spring decrement by handwheel (18).
The middle transition female connector (7) is connected by key one (6) and deflector roll (10), and the compacting ring (16) passes through key two
(14) it is connected with middle transition female connector (7).
The active synchronization wheel (3) drives passive and synchronous wheel (5) operating by synchromesh gear belt (4).
The compressed spring (15) is in the barrel of compacting ring (16), retaining ring (17) in outer side pressure, and bolt (13) uses
Screw thread spinning is sleeved on the other end of bolt (13) in the spindle nose end of deflector roll (10), handwheel (18)；Dextrorotation or derotation handwheel (18),
It is moved forward or back by the threaded adjuster bolt (13) of deflector roll (10) shaft end, compressed spring (15) is received under the action of retaining ring (17)
Contracting or elongation make the frictional force increasing between passive and synchronous wheel (5) and middle transition female connector (7) and compacting ring (16) side add deduct
It is small.
The deflector roll (10) is mounted on fixed frame by bearing (8) and bearing block (9).
It is provided with frequency converter (19), the frequency converter (19) is used to receive the velocity variations signal of deflector roll (10), and by institute
It states signal to be sent to alternating current generator (1), realizes the purpose for changing alternating current generator (1) output revolving speed.
The invention has the advantages that the output revolving speed of 1, active motor speed reducer can be by using the speed reducer of different speed ratios
Selection determines in a big way, various benchmark running speeds needed for can obtaining deflector roll transmission；In benchmark running speed
On the basis of can receive deflector roll by frequency converter again needed for velocity variations signal, then feed back to alternating current generator, pass through to change and hand over
The working frequency of galvanic electricity machine reaches the output revolving speed for changing alternating current generator at any time, reaches each needed for the operation of Serial regulation deflector roll
Kind running speed.
2, in the present invention from active motor speed reducer to friction auxiliary transmission transmitting power using high same of running precision
Tooth form V belt translation is walked, guarantees that the transient speed of active motor speed reducer output can synchronize, accurately be sent to friction auxiliary driving dress
It sets.
3, the adjustment of the friction auxiliary transmission output torque in the present invention is pressed by the elasticity that handwheel adjusts cylindrical spring
Clamp force makes the frictional force between passive belt wheel and middle transition female connector and compacting ring generate variation, to obtain deflector roll transmission institute
The output torque needed；Since cylindroid helical-coil compression spring has biggish Free Compression height, the adjustment of spring power changes
It more mitigates, adjustable range is bigger, can obtain broader output torque adjustable range.And due to directly being adjusted using handwheel,
It is easy to operate.
Detailed description of the invention
Fig. 1 is the structural diagram of the present invention.
1 it is three phase alternating current motor in figure, 2 be speed reducer, 3 be active synchronization wheel, 4 be synchromesh gear belt, 5 is passive and synchronous
Wheel, 6 be key, 7 be middle transition female connector, 8 be bearing, 9 be bearing block, 10 be deflector roll, 11 be friction plate, 12 be friction sleeve, 13
Bolt, 14 be key, 15 be cylindrical compression spring, 16 be compacting ring, 17 be retaining ring, 18 be handwheel, 19, be frequency converter.
Specific embodiment
A kind of novel deflector roll friction gearing, including alternating current generator 1 and the speed reducer driven by the alternating current generator 1
2, the speed reducer 2 drives passive and synchronous 5 rotation of wheel by the active synchronization wheel 3；
The passive and synchronous wheel 5 drives deflector roll 10 to rotate by middle transition female connector 7, the middle transition female connector 7 and passive same
The friction gearing that setting drives the middle transition female connector 7 to operate between step wheel 5, described 7 one end of middle transition female connector is set
It is equipped with the compacting ring 16 being fixed on the middle transition female connector 7 on deflector roll 10, is provided with elastic device in the compacting ring 6,
The elastic device presses to the compacting ring 16, middle transition female connector 7, realizes friction gearing and passive and synchronous wheel
5, the contact force between deflector roll 10.
The middle transition female connector 7 forms the annular convex platform of indent, is provided on the 7 side outer ring of middle transition female connector
The middle transition female connector 7 is pressed on the compacting ring 16 on the deflector roll 10；
The indent annular convex platform that the compacting ring 16 and the middle transition female connector 7 are formed forms 5 placement of passive and synchronous wheel
Space.
The friction gearing includes the friction plate that passive and synchronous wheel 5 and the contact of middle transition female connector 7 side is arranged in
11, passive and synchronous wheel 5 is set and compacting ring 16 contacts the friction plate 11 of side, and the inner ring of passive and synchronous wheel 5 is set
And middle transition covers the friction sleeve 12 between 7 outer rings.
The elastic device is arranged within the cavity of compacting ring 16, the elastic device include and the compacting ring 16,
The compressed spring 15 of 7 side of middle transition female connector contact；The outside of the compressed spring 15 contradicts the retaining ring on retaining ring 17
17 are driven the adjusting for realizing compressed spring decrement by handwheel 18.
The middle transition female connector 7 is connected by key 1 and deflector roll 10, and the compacting ring 16 passes through key 2 14 and intermediate mistake
Cross the connection of female connector 7.
The active synchronization wheel 3 drives 5 operating of passive and synchronous wheel by synchromesh gear belt 4.
The compressed spring 15 is in the barrel of compacting ring 16, retaining ring 17 in outer side pressure, and bolt 13 uses screw thread spinning
At the spindle nose end of deflector roll 10, handwheel 18 is sleeved on the other end of bolt 13；Dextrorotation or derotation handwheel 18 pass through 10 shaft end of deflector roll
Threaded adjuster bolt 13 moves forward or back, and compressed spring 15 shrinks or extend under the action of retaining ring 17, make it is passive and synchronous take turns 5 and
Frictional force between 16 side of middle transition female connector 7 and compacting ring increaseds or decreases.
The deflector roll 10 is mounted on fixed frame by bearing 8 and bearing block 9.
It is provided with frequency converter 19, the frequency converter 19 is used to receive the velocity variations signal of deflector roll 10, and by the signal
It is sent to alternating current generator 1, realizes and changes the purpose that alternating current generator 1 exports revolving speed.
The positional relationship and action principle of each part of apparatus of the present invention are as follows: being driven required benchmark according to deflector roll 10 and turn
Speed chooses the appropriate speed ratio of speed reducer 2.Then active synchronization wheel 3 is mounted on the output shaft of speed reducer 2, passes through synchronous gear
Power is passed and is taken turns on 5 for passive and synchronous by shape band 4.The spindle nose of passive and synchronous wheel 5 and deflector roll 10 does not couple not instead of directly, first will
Middle transition female connector 7 is sleeved on the spindle nose of deflector roll 10；Then passive and synchronous wheel 5 is sleeved on to the outer ring of middle transition female connector 7
On, friction plate 11 is clamped between the medial surface of passive and synchronous wheel 5 and the circular bosses side of middle transition female connector 7, passive same
Clip pad friction sleeve 12 between 7 outer ring of inner ring and middle transition female connector of step wheel 5.Middle transition in the outside of active synchronization wheel 5
Compacting ring 16 is loaded on the outer ring of female connector 7；Friction plate is clamped between the lateral surface of active synchronization wheel 5 and the end face of compacting ring 16
11.Cylindrical compression spring 15 is in the barrel of compacting ring 16, retaining ring 17 in outer side pressure, and bolt 13 is using screw thread spinning in deflector roll
10 spindle nose end, handwheel 18 are sleeved on the other end of bolt 13.Dextrorotation or derotation handwheel 18 pass through the screw thread tune of 10 shaft end of deflector roll
It saves bolt 13 to move forward or back, cylindrical compression spring 15 shrinks or extends under the action of retaining ring 17, makes passive and synchronous wheel 5 in
Between frictional force between 16 side of transition connector 7 and compacting ring increased or decrease, increased or decrease to reach by passive and synchronous
Take turns 5 sizes to 16 output torque of middle transition female connector 7 and compacting ring.Middle transition female connector 7 and compacting ring 16 pass through key 6 and key
14, respectively to 10 torque of deflector roll, reach driving deflector roll 10 and operate.Deflector roll 10 is mounted on fixed frame by bearing 8 and bearing block 9
On, when the speed of service of deflector roll 10 need to change, by issuing instructions to frequency converter 19, frequency converter 19 receives the speed of deflector roll 10
Degree variation is supplied to the working frequency of three phase alternating current motor 1 by changing after instructing, reach and change the output turn of three phase alternating current motor 1
Speed, then deflector roll 10 is sent to by above-mentioned transmission device, reach the speed of service of adjustment deflector roll 10.
The further present invention rubs secondary including the ac motor speed control by variable frequency of output torque and the adjustable variation of revolving speed
Transmission device includes the motor reducer of active, passes from motor reducer to friction auxiliary transmission and the transmission of power is replaced to fill
It sets, is directly installed on the adjustable friction gearing of output torque on deflector roll spindle nose, the fabric guide roll that transfer motion power need to be obtained, passes through
Receive the frequency converter of the working frequency of deflector roll velocity variations instruction adjustment three-phase motor speed reducer.
Active motor speed reducer of the present invention refers to the combination of three-phase AC asynchronous motor and various speed reducers,
Can be by the benchmark running speed when speed ratio of speed reducer being selected to obtain deflector roll normal operating conditions, three phase alternating current motor can be with
Output speed variation is carried out in the frequency range that frequency converter provides.
Of the present invention pass from motor reducer to friction auxiliary transmission for the transmission device of power includes being mounted on
Driving pulley, conveyer belt on speed reducer output shaft, the passive belt wheel being mounted on friction auxiliary transmission, the driving form packet
Common " V " shape V belt translation, sprocket wheel chain transmission, flat-belt drive, gear drive, Synchronous Belt Drives etc. are included, it is especially suitable
The higher Synchronous Belt Drives of precision are replaced in passing.
Friction auxiliary transmission of the present invention includes the middle transition female connector being sleeved on deflector roll spindle nose, utilizes spring
Compacting ring that elastic force compresses, the friction plate that is clipped between passive belt wheel two sides and middle transition female connector and compacting ring and passive
With the friction sleeve etc. between wheel bore inner ring and middle transition female connector
The adjustment of frictional force is driven by rotation handwheel by hold-down bolt between passive belt wheel and middle transition female connector and compacting ring
Retaining ring holddown spring is passed pressing force between passive belt wheel and middle transition female connector and compacting ring by spring.
Holddown spring of the present invention refers to cylindroid helical-coil compression spring, with biggish Free Compression height, bullet
The adjustment variation of spring elastic force more mitigates, and adjustable range is bigger.
Fabric guide roll of the present invention includes the round roller part of various diameter specifications needed for transmitting fabric, can pass through rolling
Dynamic bearing is mounted on fixed frame.
The effect of frequency converter of the present invention is to be supplied to the power frequency of three phase alternating current motor to adjust electricity by changing
The output revolving speed of machine reaches the running speed of adjustment deflector roll.
Claims (9)
1. a kind of novel deflector roll friction gearing, which is characterized in that including alternating current generator (1) and by the alternating current generator
(1) speed reducer (2) driven, the speed reducer (2) drive passive and synchronous wheel (5) to rotate by the active synchronization wheel (3)；
The passive and synchronous wheel (5) drives deflector roll (10) rotation, the middle transition female connector (7) by middle transition female connector (7)
Setting drives the friction gearing of middle transition female connector (7) operating, the middle transition between passive and synchronous wheel (5)
Female connector (7) one end is provided with the compacting ring (16) being fixed on the middle transition female connector (7) on deflector roll (10), the compacting ring
(6) it is provided with elastic device in, the elastic device presses to the compacting ring (16), middle transition female connector (7), realizes
Contact force between friction gearing and passive and synchronous wheel (5), deflector roll (10).
2. a kind of novel deflector roll friction gearing according to claim 1, which is characterized in that the middle transition female connector
(7) annular convex platform of indent is formed, is provided on middle transition female connector (7) the side outer ring by the middle transition female connector
(7) compacting ring (16) being pressed on the deflector roll (10)；
The indent annular convex platform that the compacting ring (16) and the middle transition female connector (7) are formed forms the passive and synchronous wheel
(5) space disposed.
3. a kind of novel deflector roll friction gearing according to claim 2, which is characterized in that the friction gearing
Including being arranged in the passive and synchronous friction plate (11) for taking turns (5) and middle transition female connector (7) contact side, being arranged in passive and synchronous wheel
(5) and compacting ring (16) contacts the friction plate (11) of side, and inner ring and middle transition set in passive and synchronous wheel (5) is arranged
(7) friction sleeve between outer ring (12).
4. a kind of novel deflector roll friction gearing according to claim 1, which is characterized in that the elastic device setting
Within the cavity of compacting ring (16), the elastic device includes and the compacting ring (16), middle transition female connector (7) side connect
The compressed spring (15) of touching；The outside of the compressed spring (15) contradicts on retaining ring (17), and the retaining ring (17) is by handwheel
(18) adjusting for realizing compressed spring decrement is driven.
5. a kind of novel deflector roll friction gearing according to claim 1, which is characterized in that the middle transition female connector
(7) it is connected by key one (6) and deflector roll (10), the compacting ring (16) is connected by key two (14) and middle transition female connector (7).
6. a kind of novel deflector roll friction gearing according to claim 1, which is characterized in that the active synchronization wheel
(3) passive and synchronous wheel (5) operating is driven by synchromesh gear belt (4).
7. a kind of novel deflector roll friction gearing according to claim 4, which is characterized in that the compressed spring (15)
In the barrel of compacting ring (16), retaining ring (17) in outer side pressure, spindle nose of the bolt (13) using screw thread spinning in deflector roll (10)
End, handwheel (18) are sleeved on the other end of bolt (13)；Dextrorotation or derotation handwheel (18), pass through the screw thread tune of deflector roll (10) shaft end
It saves bolt (13) to move forward or back, compressed spring (15) is shunk or extended under the action of retaining ring (17), and passive and synchronous wheel (5) is made
Frictional force between middle transition female connector (7) and compacting ring (16) side increaseds or decreases.
8. a kind of novel deflector roll friction gearing according to claim 1, which is characterized in that the deflector roll (10) passes through
Bearing (8) and bearing block (9) are mounted on fixed frame.
9. a kind of novel deflector roll friction gearing according to claim 1, which is characterized in that be provided with frequency converter
(19), the frequency converter (19) is used to receive the velocity variations signal of deflector roll (10), and the signal is sent to alternating current generator
(1), the purpose for changing alternating current generator (1) output revolving speed is realized.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811271923.5A CN109095244A (en) | 2018-10-29 | 2018-10-29 | A kind of novel deflector roll friction gearing |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811271923.5A CN109095244A (en) | 2018-10-29 | 2018-10-29 | A kind of novel deflector roll friction gearing |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109095244A true CN109095244A (en) | 2018-12-28 |
Family
ID=64869692
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811271923.5A Pending CN109095244A (en) | 2018-10-29 | 2018-10-29 | A kind of novel deflector roll friction gearing |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109095244A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111700423A (en) * | 2020-07-02 | 2020-09-25 | 刁月 | Campus dustproof bench with rotatable chair surface |
-
2018
- 2018-10-29 CN CN201811271923.5A patent/CN109095244A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111700423A (en) * | 2020-07-02 | 2020-09-25 | 刁月 | Campus dustproof bench with rotatable chair surface |
| CN111700423B (en) * | 2020-07-02 | 2024-05-03 | 刁月 | Campus dustproof bench with rotatable seat |
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Application publication date: 20181228 |