CN213235914U - Mechanical shock absorber device - Google Patents
Mechanical shock absorber device Download PDFInfo
- Publication number
- CN213235914U CN213235914U CN202021581282.6U CN202021581282U CN213235914U CN 213235914 U CN213235914 U CN 213235914U CN 202021581282 U CN202021581282 U CN 202021581282U CN 213235914 U CN213235914 U CN 213235914U
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- Prior art keywords
- supporting
- sliding
- plate
- screw rod
- adjusting block
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- 230000035939 shock Effects 0.000 title claims abstract description 24
- 239000006096 absorbing agent Substances 0.000 title claims abstract description 18
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 50
- 239000010959 steel Substances 0.000 claims abstract description 50
- 238000013016 damping Methods 0.000 claims description 48
- 230000000670 limiting effect Effects 0.000 claims description 38
- 230000007246 mechanism Effects 0.000 claims description 6
- 230000009471 action Effects 0.000 abstract description 12
- 230000000694 effects Effects 0.000 description 8
- 230000002349 favourable effect Effects 0.000 description 5
- 230000001105 regulatory effect Effects 0.000 description 5
- 238000006073 displacement reaction Methods 0.000 description 4
- 230000008859 change Effects 0.000 description 3
- 230000003139 buffering effect Effects 0.000 description 2
- 238000001125 extrusion Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
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Abstract
The utility model discloses a mechanical shock absorber device, which comprises supporting steel, wherein the supporting steel is in a U-shaped structure, and the supporting steel is provided with two supporting steels which are distributed in parallel, the upper surfaces of the two supporting steels are connected with two symmetrically distributed supporting plates in a sliding way, the upper surfaces of the supporting plates are provided with L-shaped notches, the support plate and the support steel are fixedly connected through a locking screw rod, a connecting plate is arranged between the bottoms of the two opposite sides of the support steel, the utility model is connected with the support steel in a sliding way through the support plate, thereby the distance between the two supporting plates can be adjusted, and the supporting plates can be fixed under the action of the locking screw rod, therefore, the device can adjust the distance between the two supporting plates according to the size of mechanical equipment, and is convenient to mount on the mechanical equipment with different sizes.
Description
Technical Field
The utility model relates to the technical field of mechanical equipment, specifically a mechanical shock absorber device.
Background
Mechanical equipment refers to a device which is made of metal or other materials, is assembled by a plurality of parts and can complete functions or effects of production, processing, operation and the like under the driving of one or more power.
The existing mechanical equipment is mostly provided with a damping device for reducing the vibration generated in the operation or carrying process, but the existing damping device is simple in structure, so that the electromechanical equipment generates large vibration amplitude in the working process, the service life of the mechanical equipment is influenced, and the existing damping device is inconvenient to install and fix the mechanical equipment with different sizes and is inconvenient for people to use.
Disclosure of Invention
An object of the utility model is to provide a mechanical shock absorber device to solve the problem that proposes among the above-mentioned background art.
In order to achieve the above object, the utility model provides a following technical scheme:
a mechanical shock absorber device comprises supporting steel, wherein the supporting steel is of a U-shaped structure, the supporting steel is provided with two supporting steels which are distributed in parallel, the upper surfaces of the two supporting steels are slidably connected with two supporting plates which are symmetrically distributed, the upper surfaces of the supporting plates are provided with L-shaped notches, the supporting plates and the supporting steels are fixedly connected through locking screws, a connecting plate is arranged between the bottoms of the opposite sides of the two supporting steels, supporting rods are arranged on two sides of the bottom of the connecting plate, damping cushions are arranged at the bottoms of the supporting rods, a bottom plate is arranged at the bottoms of the damping cushions, connecting rods are rotatably connected on two sides of the bottom of the supporting rods through rotating shafts, the connecting rods are obliquely arranged, sliding sleeves are rotatably connected with the bottoms of the connecting rods through rotating shafts, lead screws are sleeved on the sliding sleeves, and the sliding sleeves are slidably connected, one end of the screw rod is rotatably connected with a fixed block through a bearing, the bottom of the fixed block is fixed on the upper surface of the bottom plate, the other end of the screw rod is sleeved with an adjusting block, the bottom of the adjusting block is connected with the upper surface of the bottom plate in a sliding mode, the end portion of the screw rod extends to the outer side of the adjusting block and is provided with a rotary table, a damping spring is sleeved between the adjusting block and the sliding sleeve of the screw rod, and a supporting mechanism is arranged between the middle portion of the bottom of the connecting;
the supporting mechanism comprises a first fixed seat, the first fixed seat is fixed at the bottom of the connecting plate, a damping ring is arranged at the bottom of the first fixed seat, a second fixed seat is arranged at the bottom of the damping ring, the bottom of the second fixed seat is connected with the upper surface of the bottom plate, two sides of the damping ring are respectively provided with a buffer rod, two ends of each buffer rod are respectively connected with the first fixed seat and the second fixed seat, when in use, the bottom of the mechanical equipment is fixed at the L-shaped notches on the two supporting plates, the supporting plates are in sliding connection with the supporting steel, so that the distance between the two supporting plates can be adjusted, and the supporting plates can be fixed under the action of the locking screw rod, so that the device can adjust the distance between the two supporting plates according to the size of the mechanical equipment, thereby being convenient to install the device on the mechanical equipment with different sizes, when vibration is generated, the vibration force is transmitted to the support steel through the support plate, the impact resistance of the device is improved under the action of the support steel, and then the vibration force is transmitted to the connecting plate through the support steel, at the moment, the connecting plate moves downwards to generate acting force on the first fixing seat and the support rod, the swing amplitude of the connecting plate is reduced under the action of the damping pad and the damping ring, so that mechanical equipment is more stable, meanwhile, the connecting rods positioned on two sides of the support rod outwards extrude the sliding sleeve, so that the sliding sleeve extrudes the damping spring, the direction of the vibration force is changed, the acting force generated downwards is slowed down, so that the vibration force is dispersed, the vibration force is favorably decomposed, the damping effect of the device is improved, the mechanical equipment is well protected, the screw rod rotates through rotating the rotary disc, so that the adjusting block moves on the screw rod, thereby make the regulating block extrusion damping spring to can adjust damping spring's elastic force, be convenient for people's use.
As a further aspect of the present invention: the supporting steel upper surface middle part is provided with the limiting plate, the limiting plate is "T" type structure, the bottom and the limiting plate of backup pad correspond and are provided with the spacing groove, spacing groove and limiting plate sliding connection through the cooperation between limiting plate and the spacing groove, not only are favorable to the removal of backup pad, have still played limiting displacement to the backup pad, make it more firm.
As a further aspect of the present invention: the utility model discloses a locking device, including limiting plate, backup pad, locking screw, locking hole, locking screw, locking groove, limiting plate one side is provided with the locking groove, the backup pad is located limiting groove one side and is provided with the locking hole, the locking hole is linked together with the limiting groove, just the locking hole rotates with the locking screw to be connected, the tip and the locking inslot wall of locking screw contact, through the cooperation between locking groove, locking hole and the locking screw, are convenient for lock fixedly to the backup pad.
As a further aspect of the present invention: the adjusting block is connected with the screw rod in a rotating mode through the threaded hole, and when the screw rod rotates, the adjusting block can move on the screw rod, so that the elastic force of the damping spring can be adjusted conveniently.
As a further aspect of the present invention: the adjusting block is characterized in that a sliding block is arranged at the bottom of the adjusting block, a sliding groove is correspondingly formed in the upper surface of the bottom plate and the sliding block, the sliding block is connected with the sliding groove in a sliding mode, and the adjusting block is limited by the sliding block and the sliding groove in a sliding mode.
As a further aspect of the present invention: the buffer rod includes the slide cartridge, the slide cartridge is provided with two, two sliding connection has the slide bar between the slide cartridge, just the cover is equipped with supporting spring on the slide bar, through the cooperation between slide cartridge, slide bar and the supporting spring, has improved shock attenuation buffering effect.
Compared with the prior art, the beneficial effects of the utility model are that:
1. the utility model discloses a backup pad and supporting steel sliding connection, thereby can adjust the distance between two backup pads, and under locking screw's effect, can fix the backup pad, thereby make the device can adjust the distance between two backup pads according to mechanical equipment's size, thereby be convenient for install the device on the mechanical equipment of not unidimensional size, through the cooperation between limiting plate and the spacing groove, not only be favorable to the removal of backup pad, still played limiting displacement to the backup pad, make it more firm.
2. When producing vibrations, the shaking force passes through the backup pad and transmits to the supporting steel on, under the effect of supporting steel, the shock resistance of the device has been improved, transmit to the connecting plate by the supporting steel again, the connecting plate can move down this moment, thereby produce the effort to first fixing base and bracing piece, under the effect of damping pad and shock ring, the amplitude of oscillation of connecting plate has been reduced, thereby make mechanical equipment more firm, and simultaneously, the connecting rod that is located the bracing piece both sides can outwards extrude the sliding sleeve, thereby make the sliding sleeve extrude damping spring, thereby change the direction of shaking force, the effort of producing downwards has been slowed down, thereby make the shaking force disperse, thereby be favorable to decomposing the shaking force and come, thereby the shock attenuation effect of the device has been improved, good guard action has been played to mechanical equipment, thereby mechanical equipment's life has been prolonged.
3. Through rotating the carousel for the lead screw rotates, thereby makes the regulating block remove on the lead screw, thereby makes regulating block extrusion damping spring, thereby can adjust damping spring's elastic force, the people's of being convenient for use.
Drawings
Fig. 1 is a schematic structural view of a mechanical shock absorber device.
Fig. 2 is a connection view of a support steel and a support plate in a mechanical shock absorber device.
Fig. 3 is a partially enlarged view of a in a mechanical shock absorber device.
Fig. 4 is a partially enlarged view of B in a mechanical shock absorber device.
Fig. 5 is a schematic view showing a structure of a damping rod in a mechanical shock absorber device.
In the figure: 1. supporting steel; 2. a support plate; 3. a connecting plate; 4. a first fixed seat; 5. a shock-absorbing ring; 6. a buffer rod; 7. a second fixed seat; 8. a limiting plate; 9. a support bar; 10. a damping pad; 11. a base plate; 12. a connecting rod; 13. a limiting groove; 14. a locking hole; 15. locking the screw rod; 16. a locking groove; 17. a screw rod; 18. an adjusting block; 19. a damping spring; 20. a chute; 21. a slider; 22. a sliding sleeve; 23. a slide cylinder; 24. a slide bar; 25. supporting the spring.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
Referring to fig. 1 to 5, in the embodiment of the present invention, a mechanical shock absorber device includes a supporting steel 1, the supporting steel 1 is a "U-shaped structure", and the supporting steel 1 is provided with two, parallel supporting steels 1, two, symmetrical supporting plates 2 are slidably connected to the upper surface of the two supporting steels 1, the upper surface of the supporting plate 2 is provided with an "L" shaped notch, the supporting plate 2 and the supporting steel 1 are fixedly connected through a locking screw 15, a connecting plate 3 is provided between the bottom of one side of the two supporting steels 1 opposite to each other, supporting rods 9 are provided on both sides of the bottom of the connecting plate 3, a damping pad 10 is provided at the bottom of the supporting rods 9, a bottom plate 11 is provided at the bottom of the damping pad 10, a connecting rod 12 is rotatably connected to both sides of the bottom of the supporting rods 9 through a rotating shaft, the connecting rod, the bottom of the connecting rod 12 is rotatably connected with a sliding sleeve 22 through a rotating shaft, the sliding sleeve 22 is sleeved with a screw rod 17, the sliding sleeve 22 is slidably connected with the screw rod 17, one end of the screw rod 17 is rotatably connected with a fixed block through a bearing, the bottom of the fixed block is fixed on the upper surface of the bottom plate 11, the other end of the screw rod 17 is sleeved with an adjusting block 18, the bottom of the adjusting block 18 is slidably connected with the upper surface of the bottom plate 11, the end part of the screw rod 17 extends to the outer side of the adjusting block 18 and is provided with a rotary table, a damping spring 19 is sleeved between the adjusting block 18 and the sliding sleeve 22 of the screw rod 17, and a supporting mechanism is arranged between; the supporting mechanism comprises a first fixing seat 4, the first fixing seat 4 is fixed to the bottom of the connecting plate 3, a damping ring 5 is arranged at the bottom of the first fixing seat 4, a second fixing seat 7 is arranged at the bottom of the damping ring 5, the bottom of the second fixing seat 7 is connected with the upper surface of the bottom plate 11, buffer rods 6 are arranged on two sides of the damping ring 5, and two ends of each buffer rod 6 are connected with the first fixing seat 4 and the second fixing seat 7 respectively.
When in use, the bottom of the mechanical equipment is fixed at the L-shaped notches on the two supporting plates 2, the supporting plates 2 are connected with the supporting steel 1 in a sliding manner, so that the distance between the two supporting plates 2 can be adjusted, the supporting plates 2 can be fixed under the action of the locking screw rods 15, and the distance between the two supporting plates 2 can be adjusted according to the size of the mechanical equipment, so that the device can be conveniently installed on the mechanical equipment with different sizes, when vibration is generated, the vibration force is transmitted to the supporting steel 1 through the supporting plates 2, the impact resistance of the device is improved under the action of the supporting steel 1 and then transmitted to the connecting plate 3 through the supporting steel 1, at the moment, the connecting plate 3 can move downwards, so that acting force is generated on the first fixing seat 4 and the supporting rod 9, and the swing amplitude of the connecting plate 3 is reduced under the action of the damping pad 10 and the damping ring 5, thereby make mechanical equipment more firm, simultaneously, connecting rod 12 that is located bracing piece 9 both sides can outwards extrude sliding sleeve 22, thereby make sliding sleeve 22 extrude damping spring 19, thereby change the direction of vibrations, the effort of downward production has been slowed down, thereby make the vibrations disperse, thereby be favorable to decomposing the vibrations, thereby the device's shock attenuation effect has been improved, good guard action has been played mechanical equipment, through rotating the carousel, make lead screw 17 rotate, thereby make regulating block 18 remove on lead screw 17, thereby make regulating block 18 extrude damping spring 19, thereby can adjust damping spring 19's elastic force, be convenient for people's use.
The middle part of the upper surface of the support steel 1 is provided with a limiting plate 8, the limiting plate 8 is of a T-shaped structure, the bottom of the support plate 2 is provided with a limiting groove 13 corresponding to the limiting plate 8, and the limiting groove 13 is connected with the limiting plate 8 in a sliding mode.
Through the cooperation between limiting plate 8 and the spacing groove 13, not only be favorable to the removal of backup pad 2, still played limiting displacement to backup pad 2, make it more firm.
Limiting plate 8 one side is provided with locking groove 16, backup pad 2 is located limiting groove 13 one side and is provided with locking hole 14, locking hole 14 is linked together with limiting groove 13, just locking hole 14 is rotated with locking screw 15 and is connected, the tip and the locking groove 16 inner wall of locking screw 15 contact.
Through the cooperation between locking groove 16, locking hole 14 and locking screw 15, be convenient for lock the fixed to backup pad 2.
The adjusting block 18 is provided with a threaded hole at the joint with the screw rod 17, and the adjusting block 18 is rotatably connected with the screw rod 17 through the threaded hole.
Through the threaded hole arranged on the adjusting block 18, when the screw rod 17 rotates, the adjusting block 18 can move on the screw rod 17, so that the elastic force of the damping spring 19 can be adjusted conveniently.
The bottom of the adjusting block 18 is provided with a sliding block 21, the upper surface of the bottom plate 11 is provided with a sliding groove 20 corresponding to the sliding block 21, and the sliding block 21 is connected with the sliding groove 20 in a sliding manner.
The sliding block 21 is connected with the sliding groove 20 in a sliding mode, and the adjusting block 18 is limited.
Buffer beam 6 includes slide cartridge 23, slide cartridge 23 is provided with two, two sliding connection has slide bar 24 between the slide cartridge 23, just the cover is equipped with supporting spring 25 on the slide bar 24.
Through the cooperation among slide cartridge 23, slide bar 24 and supporting spring 25, improved shock attenuation buffering effect.
The utility model discloses a theory of operation is:
when in use, the bottom of the mechanical equipment is fixed at the L-shaped notches on the two supporting plates 2, the supporting plates 2 are connected with the supporting steel 1 in a sliding manner, so that the distance between the two supporting plates 2 can be adjusted, the supporting plates 2 can be fixed under the action of the locking screw rods 15, and the distance between the two supporting plates 2 can be adjusted according to the size of the mechanical equipment, so that the device can be conveniently installed on the mechanical equipment with different sizes, when vibration is generated, the vibration force is transmitted to the supporting steel 1 through the supporting plates 2, the impact resistance of the device is improved under the action of the supporting steel 1 and then transmitted to the connecting plate 3 through the supporting steel 1, at the moment, the connecting plate 3 can move downwards, so that acting force is generated on the first fixing seat 4 and the supporting rod 9, and the swing amplitude of the connecting plate 3 is reduced under the action of the damping pad 10 and the damping ring 5, thereby the mechanical equipment is more stable, simultaneously, the connecting rods 12 at the two sides of the supporting rod 9 can extrude the sliding sleeve 22 outwards, thereby the sliding sleeve 22 extrudes the damping spring 19, thereby the direction of the vibration force is changed, the acting force generated downwards is slowed down, thereby the vibration force is dispersed, thereby the vibration force is favorably decomposed, thereby the damping effect of the device is improved, the mechanical equipment is well protected, the screw rod 17 rotates by rotating the turntable, thereby the adjusting block 18 moves on the screw rod 17, thereby the adjusting block 18 extrudes the damping spring 19, thereby the elastic force of the damping spring 19 can be adjusted, the use of people is convenient, through the matching between the limiting plate 8 and the limiting groove 13, the movement of the supporting plate 2 is favorably realized, the limiting effect is realized on the supporting plate 2, and the stability is more stable, through the cooperation between locking groove 16, locking hole 14 and the locking screw 15, be convenient for lock fixedly to backup pad 2, through the screw hole that sets up on adjusting block 18, when lead screw 17 rotated, adjusting block 18 just can remove on lead screw 17 to be convenient for adjust damping spring 19's elasticity, through slider 21 and 20 sliding connection of spout, played limiting displacement to adjusting block 18.
The above, only be the concrete implementation of the preferred embodiment of the present invention, but the protection scope of the present invention is not limited thereto, and any person skilled in the art is in the technical scope of the present invention, according to the technical solution of the present invention and the utility model, the concept of which is equivalent to replace or change, should be covered within the protection scope of the present invention.
Claims (6)
1. A mechanical shock absorber device comprises supporting steel (1) and is characterized in that the supporting steel (1) is of a U-shaped structure, the number of the supporting steel (1) is two, the two supporting steel (1) are distributed in parallel, the upper surfaces of the two supporting steel (1) are connected with two supporting plates (2) which are symmetrically distributed in a sliding mode, the upper surface of each supporting plate (2) is provided with an L-shaped notch, the supporting plates (2) and the supporting steel (1) are fixedly connected through locking screws (15), a connecting plate (3) is arranged between the bottoms of the opposite sides of the two supporting steel (1), supporting rods (9) are arranged on two sides of the bottom of the connecting plate (3), damping pads (10) are arranged on the bottoms of the supporting rods (9), bottom plates (11) are arranged on the bottoms of the damping pads (10), and connecting rods (12) are rotatably connected to two sides of the bottoms of the supporting rods (9) through rotating shafts, the connecting rod (12) is obliquely arranged, the bottom of the connecting rod (12) is rotatably connected with a sliding sleeve (22) through a rotating shaft, the sliding sleeve (22) is sleeved with a screw rod (17), the sliding sleeve (22) is slidably connected with the screw rod (17), one end of the screw rod (17) is rotatably connected with a fixed block through a bearing, the bottom of the fixed block is fixed on the upper surface of a bottom plate (11), an adjusting block (18) is sleeved at the other end of the screw rod (17), the bottom of the adjusting block (18) is slidably connected with the upper surface of the bottom plate (11), the end part of the screw rod (17) extends to the outer side of the adjusting block (18) and is provided with a rotary table, a damping spring (19) is sleeved between the adjusting block (18) and the sliding sleeve (22) and the screw rod (17), and a supporting mechanism is arranged between the middle part;
the supporting mechanism comprises a first fixing seat (4), the first fixing seat (4) is fixed to the bottom of the connecting plate (3), a damping ring (5) is arranged at the bottom of the first fixing seat (4), a second fixing seat (7) is arranged at the bottom of the damping ring (5), the bottom of the second fixing seat (7) is connected with the upper surface of the bottom plate (11), buffer rods (6) are arranged on two sides of the damping ring (5), and two ends of each buffer rod (6) are connected with the first fixing seat (4) and the second fixing seat (7) respectively.
2. The mechanical shock absorber device according to claim 1, wherein a limiting plate (8) is arranged in the middle of the upper surface of the supporting steel (1), the limiting plate (8) is of a T-shaped structure, a limiting groove (13) is formed in the bottom of the supporting plate (2) and corresponds to the limiting plate (8), and the limiting groove (13) is in sliding connection with the limiting plate (8).
3. The mechanical shock absorber device according to claim 2, wherein a locking groove (16) is formed in one side of the limiting plate (8), a locking hole (14) is formed in one side, located on the limiting groove (13), of the supporting plate (2), the locking hole (14) is communicated with the limiting groove (13), the locking hole (14) is rotatably connected with a locking screw (15), and the end portion of the locking screw (15) is in contact with the inner wall of the locking groove (16).
4. The mechanical shock absorber device as claimed in claim 1, wherein a threaded hole is formed at the joint of the adjusting block (18) and the screw rod (17), and the adjusting block (18) is rotatably connected with the screw rod (17) through the threaded hole.
5. The mechanical shock absorber device according to claim 1, wherein a sliding block (21) is arranged at the bottom of the adjusting block (18), a sliding groove (20) is arranged on the upper surface of the bottom plate (11) corresponding to the sliding block (21), and the sliding block (21) is in sliding connection with the sliding groove (20).
6. A mechanical shock absorber device according to claim 1, wherein the buffer rod (6) comprises two sliding cylinders (23), a sliding rod (24) is slidably connected between the two sliding cylinders (23), and a supporting spring (25) is sleeved on the sliding rod (24).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021581282.6U CN213235914U (en) | 2020-08-03 | 2020-08-03 | Mechanical shock absorber device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021581282.6U CN213235914U (en) | 2020-08-03 | 2020-08-03 | Mechanical shock absorber device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN213235914U true CN213235914U (en) | 2021-05-18 |
Family
ID=75892533
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202021581282.6U Expired - Fee Related CN213235914U (en) | 2020-08-03 | 2020-08-03 | Mechanical shock absorber device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN213235914U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115111502A (en) * | 2022-07-26 | 2022-09-27 | 徐州市耐力高分子科技有限公司 | Mining machinery vibration damping mount |
-
2020
- 2020-08-03 CN CN202021581282.6U patent/CN213235914U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115111502A (en) * | 2022-07-26 | 2022-09-27 | 徐州市耐力高分子科技有限公司 | Mining machinery vibration damping mount |
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| Date | Code | Title | Description |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20210518 |