CN112065911B - Vibration buffering and limiting device - Google Patents
Vibration buffering and limiting device Download PDFInfo
- Publication number
- CN112065911B CN112065911B CN202010908047.3A CN202010908047A CN112065911B CN 112065911 B CN112065911 B CN 112065911B CN 202010908047 A CN202010908047 A CN 202010908047A CN 112065911 B CN112065911 B CN 112065911B
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- limiting
- upper roller
- roller
- buffering connecting
- hole
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F15/00—Suppression of vibrations in systems; Means or arrangements for avoiding or reducing out-of-balance forces, e.g. due to motion
- F16F15/02—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D71/00—Mechanisms for bringing members to rest in a predetermined position
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Acoustics & Sound (AREA)
- Aviation & Aerospace Engineering (AREA)
- Vibration Prevention Devices (AREA)
Abstract
The invention relates to the field of continuous casting machines in metallurgical industry, in particular to a vibration buffering limiting device which comprises a buffering connecting frame and a buffering connecting seat, wherein an upper roller assembly is arranged at the lower part of the buffering connecting frame, a roller mounting frame is arranged at the upper part of the buffering connecting seat, a lower roller assembly is arranged on the roller mounting frame, vertical limiting plates are respectively arranged on two sides between the buffering connecting frame and the buffering connecting seat, a vertical first limiting hole is formed in the upper part of each limiting plate, the upper roller assembly is provided with an upper roller and an upper roller shaft, the lower roller assembly is provided with a lower roller, and a buffer is arranged between the upper roller and the lower roller. According to the invention, through the first limiting hole formed in the limiting plate, when the buffer is stressed to reciprocate, the stroke of the upper roller shaft is limited, the reciprocating motion of the buffer is limited, and the limiting protection effect is provided for the vibration device, so that accidents such as shutdown and the like caused by over-stroke operation of the buffer are avoided.
Description
Technical Field
The invention relates to the field of continuous casting machines in the metallurgical industry, in particular to a vibration buffering and limiting device.
Background
Continuous casting is continuous casting steel, which is an important process for producing various steel products in steel plants, a crystallizer is a core component of continuous casting production equipment, and the crystallizer is driven by a vibrating device to vibrate to help a billet which is condensed into a solid shell to be smoothly pulled out from the lower part. The electric cylinder or the driver drives the vibration device to vibrate, the buffer device is arranged on the vibration arm to balance the weight of the crystallizer, so that the impact of the vibration load on the vibration device is reduced, the vibration device plays a vital role in the vibration of the whole vibration frame and the crystallizer, and the process of billet production and the billet quality are directly influenced. However, the inventor finds that the buffer device cannot limit and adjust in the working operation and cannot play a protection role, so that the problems of incapability of limiting the operation of the vibration table, overstroke vibration, large deviation of linear operation, large autorotation abrasion of the buffer and the like occur, the phenomenon of unsmooth vibration occurs due to the lack of a balance effect, the number of times of abnormal shutdown of the continuous casting machine is increased, and the quality of steel billets and the whole continuous casting production efficiency are influenced.
Disclosure of Invention
The invention provides a vibration buffering limiting device, which aims to solve the technical problem that a buffering device cannot limit and adjust in working operation and cannot play a role in protection.
The invention relates to a vibration buffering and limiting device, which comprises a buffering connecting frame and a buffering connecting seat, wherein the lower part of the buffering connecting frame is provided with an upper roller assembly, the upper part of the buffering connecting seat is provided with a roller mounting frame, the roller mounting frame is provided with a lower roller assembly, two sides between the buffering connecting frame and the buffering connecting seat are respectively provided with a vertical limiting plate, the upper part of the limiting plate is provided with a vertical first limiting hole, the upper roller assembly is provided with an upper roller and an upper roller shaft, two ends of the upper roller shaft are respectively positioned in the corresponding first limiting holes and can move up and down along the first limiting holes, the lower roller assembly is provided with a lower roller, a buffer is arranged between the upper roller and the lower roller, the buffering connecting seat is provided with at least two clamping plate mounting seats, the clamping plate mounting seats are matched and provided with adjusting bolts, one end of each adjusting bolt is provided with a clamping plate, the clamping plates are positioned between the roller mounting seats and the clamping plate mounting seats, the clamping groove is formed in the side wall, facing the roller mounting frame, of the clamping plate, and a part of the roller mounting frame is located in the clamping groove.
Furthermore, the lower part of limiting plate set up the screw rod, set up the through-hole on the buffering connecting seat, the screw rod is located the through-hole that corresponds and can reciprocate in the through-hole, two lock nuts of installation on the screw rod, two lock nuts are located the upper and lower both sides of buffering connecting seat respectively.
Furthermore, the buffer connecting seat is provided with two fixing plates, the fixing plates are provided with fixing holes, the limiting plates are provided with second limiting holes, fixing bolts are arranged between the fixing plates and the corresponding limiting plates, and the fixing bolts penetrate through the fixing holes and the second limiting holes.
Furthermore, the second limiting hole is a vertical long hole.
Furthermore, the fixing plate is provided with a groove, and the corresponding limiting plate is arranged in the groove in a matching manner.
Furthermore, two ends of the upper roller shaft are respectively provided with a limiting table.
Furthermore, the upper roller assembly is also provided with a bearing, and the upper roller is arranged on the upper roller shaft through the bearing.
Furthermore, an oil hole is formed in the upper roller shaft, and one end of the oil hole is communicated with the bearing.
Furthermore, the upper roller and the lower roller are both concave wheels.
Furthermore, the upper roller and the lower roller are arc wheels
The invention has the beneficial effects that the first limiting hole is formed in the limiting plate, so that when the buffer is stressed to reciprocate, the reciprocating motion of the buffer can be limited by limiting the stroke of the upper roller shaft, the limiting effect on the reciprocating motion of the buffer is achieved, and the limiting protection effect on the vibration device can be achieved, so that accidents such as shutdown and the like caused by over-stroke operation of the buffer are avoided. In addition, the limiting plate and the roller mounting frame are reasonably arranged, so that the structure is simpler, the operation and maintenance space is larger, the overall size is reduced, and the cost is saved. The invention can limit the degree of freedom of rotation of the roller mounting rack during production, so that the buffer does not rotate during reciprocating motion, the vibration of the vibration device is more stable, and the production of a steel mill is more efficient.
Drawings
FIG. 1 is a schematic structural diagram of the present invention;
FIG. 2 is a left side view of FIG. 1;
FIG. 3 is a top view of FIG. 1, with the bumper attachment frame, upper roller assemblies and bumpers omitted;
FIG. 4 is a schematic structural diagram of a limiting plate of the present invention;
fig. 5 is a schematic structural view of an upper roller assembly of the present invention.
In the figure, the device comprises a buffer connecting frame 1, a buffer connecting frame 2, an upper roller assembly 3, a buffer 4, a limiting plate 5, a clamping plate 6, an adjusting bolt 7, a clamping plate mounting seat 8, a buffer connecting seat 9, a locking nut 10, a roller mounting frame 11, a lower roller assembly 12, a fixing bolt 13, a fixing plate 14, a first limiting hole 15, a second limiting hole 2a, an upper roller 2b, a bearing 2c and an upper roller shaft.
Detailed Description
As shown in fig. 1-5, a vibration buffering stop device, including buffering link 1 and buffering connecting seat 8, buffer link 1 lower part sets up wheel components 2, buffering connecting seat 8 upper portion sets up wheel mounting bracket 10, set up wheel components 11 down on the wheel mounting bracket 10, both sides between buffering link 1 and the buffering connecting seat 8 set up vertical limiting plate 4 respectively, vertical first spacing hole 14 is seted up on limiting plate 4 upper portion, go up wheel components 2 and have last gyro wheel 2a and last gyro wheel axle 2c, the both ends of going up gyro wheel axle 2c are located corresponding first spacing hole 14 respectively and can follow first spacing hole 14 and reciprocate, lower wheel components 11 have the gyro wheel down, go up and set up buffer 3 between gyro wheel 2a and the lower gyro wheel. Buffering link 1 is connected with the shaking table, and buffering connecting seat 8 is connected with the fixed station on the ground. The buffer 3 can perform a buffering function. According to the structure, the first limiting hole 14 formed in the limiting plate 4 can limit the stroke of the upper roller shaft 2c when the buffer 3 is stressed to reciprocate, so that the reciprocating motion of the buffer 3 is limited, a limiting protection effect can be achieved for the vibrating device, and accidents such as shutdown and the like caused by over-stroke operation of the buffer 3 are avoided. In addition, the reasonable arrangement of the limiting plate 4 and the roller mounting rack 10 in the structure enables the structure to be simpler, the operation and maintenance space to be larger, the overall size to be reduced, and the cost to be saved. Set up two at least grip block mount pads 7 on the buffering connecting seat 8, cooperate installation adjusting bolt 6 on the grip block mount pad 7, adjusting bolt 6's one end sets up grip block 5, grip block 5 is located between gyro wheel mounting bracket 10 and grip block mount pad 7, set up the draw-in groove on the lateral wall of one side of grip block 5 towards gyro wheel mounting bracket 10, some of gyro wheel mounting bracket 10 is located the draw-in groove, the draw-in groove can restrict the partly swing of gyro wheel mounting bracket 10 that is located it. The clamping grooves in the clamping plate 5 can limit the degree of freedom of rotation of the roller mounting frame 10 during production, so that the buffer 3 does not rotate during reciprocating motion and the vibration device vibrates more stably, and the steel mill production is more efficient. The clamping plate 5 and the limiting plate 4 can be arranged in parallel or in a staggered angle mode, so that the whole space is reasonably arranged, and the whole use and operation space is better. The adjusting bolt 6 can adjust the distance between the clamping plate 5 and the roller mounting frame 10, so that the swing amplitude of the roller mounting frame 10 can be adjusted. The adjusting bolts 6 can also enable the clamping plate 5 to be tightly attached to the roller mounting frame 10, so that the rotation of the roller mounting frame 10 is limited, the axial rotation during the production of the buffer 3 is also limited, the abrasion of the buffer 3 is eliminated, and the adverse effect of uneven stress caused by the rotation motion on the production is eliminated. The adjusting bolt 6 and the clamping plate 5 can rotate relatively, so that the clamping plate 5 is prevented from being influenced by the rotation of the adjusting bolt 6.
The lower part of limiting plate 4 set up the screw rod, offer the through-hole on the buffering connecting seat 8, the screw rod is located the through-hole that corresponds and can reciprocate in the through-hole, two lock nut 9 of installation on the screw rod, two lock nut 9 are located the upper and lower both sides of buffering connecting seat 8 respectively. The structure can fix the limiting plate 4 through the locking nuts 9, and can adjust the height position of the limiting plate 4 by adjusting the positions of the two locking nuts 9 on the screw rod, so that the range of the stroke of the upper roller shaft 2c is adjusted, the adjustment and limiting effects on the reciprocating motion height position of the buffer 3 are realized, different scenes are adapted, and the production conditions of different reciprocating strokes are met.
The buffer connecting seat 8 is provided with two fixing plates 13, the fixing plates 13 are provided with fixing holes, the limiting plates 4 are provided with second limiting holes 15, fixing bolts 12 are arranged between the fixing plates 13 and the corresponding limiting plates 4, and the fixing bolts 12 penetrate through the fixing holes and the second limiting holes 15. The cooperation of fixed plate 13 and fixing bolt 12 has the distance between regulation fixed plate 13 and the limiting plate 4 and with the spacing fixed effect of limiting plate 4, avoids limiting plate 4 to cushion connecting seat 8 relatively and removes, rotates, swing etc..
The second limiting hole 15 is a vertical long hole. The height position of the limiting plate 4 relative to the fixing plate 13 can be adjusted by the elongated second limiting hole 15 so as to adapt to different scenes and meet the production conditions of different reciprocating strokes.
The fixed plate 13 is provided with a groove, and the corresponding limit plate 4 is arranged in the groove in a matching manner. This structure can ensure relative parallelism between the limit plate 4 and the fixed plate 13 without relative rotation, thereby facilitating fixing the limit plate 4.
And two ends of the upper roller shaft 2c are respectively provided with a limiting table. The limit table can limit the installation position of the upper roller 2a in the axial direction.
The upper roller assembly 2 is also provided with a bearing 2b, and the upper roller 2a is arranged on an upper roller shaft 2c through the bearing 2 b. The bearing 2b can reduce friction between the damper 3 and the upper roller shaft 2c during production, thereby reducing wear during production.
An oil hole is formed in the upper roller shaft 2c, and one end of the oil hole is communicated with the bearing 2 b. Lubricating oil can enter the bearing 2b through the oil hole, so that the bearing 2b is better matched with the upper roller 2a, the friction between the buffer 3 and the upper roller shaft 2c during production is reduced, and the loss is reduced. The position of the oil hole may also be set on the upper roller 2 a.
The upper roller 2a and the lower roller are both concave wheels. The concave design limits that the connecting part of the buffer 3 can only work in the upper roller 2a and the lower roller, limits the freedom degree of axial movement of the buffer 3 during production, reduces the autorotation movement of the buffer 3, reduces the loss of the buffer 3, and reduces the adverse effect of deviation of the buffer 3 on production.
Further, the upper roller 2a and the lower roller are both arc-shaped wheels. The concave wheel can be a V-shaped wheel, a U-shaped wheel, a semicircular wheel and the like. The arc wheel, the V-shaped wheel, the U-shaped wheel and the semicircular wheel are all in the shape of one side of a symmetrical figure formed by cutting along the diameter of the roller.
Claims (8)
1. The utility model provides a vibration buffering stop device which characterized in that: comprises a buffering connecting frame (1) and a buffering connecting seat (8), an upper roller component (2) is arranged at the lower part of the buffering connecting frame (1), a roller mounting frame (10) is arranged at the upper part of the buffering connecting seat (8), a lower roller component (11) is arranged on the roller mounting frame (10), vertical limiting plates (4) are respectively arranged at two sides between the buffering connecting frame (1) and the buffering connecting seat (8), a vertical first limiting hole (14) is formed at the upper part of each limiting plate (4), an upper roller (2a) and an upper roller shaft (2c) are arranged on each upper roller component (2), two ends of each upper roller shaft (2c) are respectively positioned in the corresponding first limiting holes (14) and can move up and down along the first limiting holes (14), a lower roller is arranged on each lower roller component (11), a buffer (3) is arranged between each upper roller (2a) and each lower roller, at least two clamping plate mounting seats (7) are arranged on the buffering connecting seat (8), adjusting bolts (6) are installed on the clamping plate installing seat (7) in a matched mode, one end of each adjusting bolt (6) is provided with a clamping plate (5), the clamping plate (5) is located between the roller installing frame (10) and the clamping plate installing seat (7), a clamping groove is formed in the side wall, facing the roller installing frame (10), of the clamping plate (5), a part of the roller installing frame (10) is located in the clamping groove, and the upper rollers (2a) and the lower rollers are arc-shaped wheels.
2. A vibration dampening and limiting device as defined in claim 1, wherein: the lower part of limiting plate (4) set up the screw rod, set up the through-hole on buffering connecting seat (8), the screw rod is located the through-hole that corresponds and can reciprocate in the through-hole, two lock nut (9) of installation on the screw rod, two lock nut (9) are located the upper and lower both sides of buffering connecting seat (8) respectively.
3. A vibration dampening and limiting device as defined in claim 1, wherein: buffer connection seat (8) on set up two fixed plates (13), set up the fixed orifices on fixed plate (13), set up spacing hole of second (15) on limiting plate (4), set up fixing bolt (12) between fixed plate (13) and the limiting plate (4) that correspond, fixing bolt (12) pass fixed orifices and spacing hole of second (15).
4. A vibration dampening and limiting device as defined in claim 3, wherein: the second limiting hole (15) is a vertical long hole.
5. A vibration dampening and limiting device as defined in claim 3, wherein: the fixing plate (13) is provided with a groove, and the corresponding limiting plate (4) is arranged in the groove in a matching manner.
6. A vibration dampening and limiting device as defined in claim 1, wherein: and two ends of the upper roller shaft (2c) are respectively provided with a limiting table.
7. A vibration dampening and limiting device as defined in claim 1, wherein: the upper roller assembly (2) is also provided with a bearing (2b), and the upper roller (2a) is arranged on an upper roller shaft (2c) through the bearing (2 b).
8. A vibration dampening and limiting device as defined in claim 7, wherein: an oil hole is formed in the upper roller shaft (2c), and one end of the oil hole is communicated with the bearing (2 b).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010908047.3A CN112065911B (en) | 2020-09-02 | 2020-09-02 | Vibration buffering and limiting device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010908047.3A CN112065911B (en) | 2020-09-02 | 2020-09-02 | Vibration buffering and limiting device |
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| Publication Number | Publication Date |
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| CN112065911A CN112065911A (en) | 2020-12-11 |
| CN112065911B true CN112065911B (en) | 2021-11-16 |
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| CN202010908047.3A Active CN112065911B (en) | 2020-09-02 | 2020-09-02 | Vibration buffering and limiting device |
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Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2011148442A (en) * | 2010-01-22 | 2011-08-04 | Mitsubishi Motors Corp | Suspension bush and suspension device using the same |
| EP2524872A1 (en) * | 2011-05-19 | 2012-11-21 | Honeywell International Inc. | Thermally-conductive vibration isolators and spacecraft isolation systems employing the same |
| CN202674153U (en) * | 2012-06-18 | 2013-01-16 | 无锡市宏源弹性器材有限公司 | Thrashing resisting carrying platform |
| CN204122709U (en) * | 2014-08-22 | 2015-01-28 | 衡阳镭目科技有限责任公司 | Aluminium casting-rolling mill ceiling device |
| CN107345553A (en) * | 2017-09-07 | 2017-11-14 | 中国船舶重工集团公司第七〇九研究所 | A kind of shock resistance rocking equipment for active vibration insulator |
| CN207111813U (en) * | 2017-08-10 | 2018-03-16 | 中国扬子集团滁州扬子空调器有限公司 | Shearing resistance cut type self-locking spring damper |
| CN209811009U (en) * | 2019-04-23 | 2019-12-20 | 杭州电力设备制造有限公司 | Punching device for memory alloy gasket |
| CN111550513A (en) * | 2020-05-16 | 2020-08-18 | 盐城市美环减振器制造有限公司 | Anti-shearing spring shock absorber |
| CN211399028U (en) * | 2019-12-27 | 2020-09-01 | 青岛罗德通用机械设备有限公司 | Petroleum pump installation mount |
| CN213052668U (en) * | 2020-09-02 | 2021-04-27 | 衡阳镭目科技有限责任公司 | Vibration buffering and limiting device |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5253849A (en) * | 1991-07-19 | 1993-10-19 | Yoshihide Kamada | Wheel suspension structure with buffering leaf springs |
| CA2354577C (en) * | 2001-06-19 | 2007-10-09 | U-Haul International, Inc. | Trailer |
| CN103241263B (en) * | 2013-04-18 | 2015-06-10 | 南车眉山车辆有限公司 | Active release device |
-
2020
- 2020-09-02 CN CN202010908047.3A patent/CN112065911B/en active Active
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2011148442A (en) * | 2010-01-22 | 2011-08-04 | Mitsubishi Motors Corp | Suspension bush and suspension device using the same |
| EP2524872A1 (en) * | 2011-05-19 | 2012-11-21 | Honeywell International Inc. | Thermally-conductive vibration isolators and spacecraft isolation systems employing the same |
| CN202674153U (en) * | 2012-06-18 | 2013-01-16 | 无锡市宏源弹性器材有限公司 | Thrashing resisting carrying platform |
| CN204122709U (en) * | 2014-08-22 | 2015-01-28 | 衡阳镭目科技有限责任公司 | Aluminium casting-rolling mill ceiling device |
| CN207111813U (en) * | 2017-08-10 | 2018-03-16 | 中国扬子集团滁州扬子空调器有限公司 | Shearing resistance cut type self-locking spring damper |
| CN107345553A (en) * | 2017-09-07 | 2017-11-14 | 中国船舶重工集团公司第七〇九研究所 | A kind of shock resistance rocking equipment for active vibration insulator |
| CN209811009U (en) * | 2019-04-23 | 2019-12-20 | 杭州电力设备制造有限公司 | Punching device for memory alloy gasket |
| CN211399028U (en) * | 2019-12-27 | 2020-09-01 | 青岛罗德通用机械设备有限公司 | Petroleum pump installation mount |
| CN111550513A (en) * | 2020-05-16 | 2020-08-18 | 盐城市美环减振器制造有限公司 | Anti-shearing spring shock absorber |
| CN213052668U (en) * | 2020-09-02 | 2021-04-27 | 衡阳镭目科技有限责任公司 | Vibration buffering and limiting device |
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| CN112065911A (en) | 2020-12-11 |
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