CN110369035A - Four-roller crusher roller gap self-checking device - Google Patents
Four-roller crusher roller gap self-checking device Download PDFInfo
- Publication number
- CN110369035A CN110369035A CN201910783110.2A CN201910783110A CN110369035A CN 110369035 A CN110369035 A CN 110369035A CN 201910783110 A CN201910783110 A CN 201910783110A CN 110369035 A CN110369035 A CN 110369035A
- Authority
- CN
- China
- Prior art keywords
- driven voller
- drive roll
- oil cylinder
- control
- bearing blocks
- 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
Links
- 230000033228 biological regulation Effects 0.000 abstract description 3
- 241001131688 Coracias garrulus Species 0.000 description 32
- 239000000463 material Substances 0.000 description 6
- 230000007423 decrease Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C4/00—Crushing or disintegrating by roller mills
- B02C4/02—Crushing or disintegrating by roller mills with two or more rollers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C4/00—Crushing or disintegrating by roller mills
- B02C4/28—Details
- B02C4/32—Adjusting, applying pressure to, or controlling the distance between, milling members
Landscapes
- Engineering & Computer Science (AREA)
- Food Science & Technology (AREA)
- Crushing And Grinding (AREA)
Abstract
The invention discloses a kind of four-roller crusher roller gap self-checking devices, including host computer, control cabinet, adjustment device, oil cylinder, upper drive roll, upper driven voller, lower drive roll, lower driven voller and control device；Two driven voller bearing blocks of upper driven voller and the driven voller bearing block of lower driven voller are arranged on the sliding rail of rack；An oil cylinder is respectively equipped at each driven voller bearing block in rack, it is respectively equipped with adjustment device between two drive roll bearing blocks of upper drive roll and two driven voller bearing blocks of upper driven voller, is respectively equipped with adjustment device between two drive roll bearing blocks of lower drive roll and two driven voller bearing blocks of lower driven voller；The hydraulic station and pressure transmitter and adjustment device of oil cylinder are connect with control cabinet, and control cabinet is connect with host computer.The configuration of the present invention is simple, it is at low cost, and also the present invention realizes automatic control, improves adjusting efficiency, reduces the labor intensity and cost of labor of worker, and improves degree of regulation.
Description
Technical field
The invention belongs to crusher technical fields, specifically design a kind of four-roller crusher roller gap automatic adjustment dress
It sets.
Background technique
Four-roller crusher is broken and fine crusher during one kind is structurally reasonable, compact, operating is reliable.Its working principle
It is: material is brought by the frictional force of roller surfaces in the working chamber of two rollers, rolles over material with shearing force by squeezing
It grinds and is crushed.The control of product granularity is to adjust system by hydraulic protecting the bearing block coupled with roll shaft is driven to move forward and backward,
Then the gap between two rollers (drive roll and passive guide roller) is adjusted to realize.
The adjustment of present roller gap is that 2 front and back of driven voller bearing block is driven by the extension and retraction of the piston of oil cylinder 1
It moves and adjustment gasket 3 is used to adjust the position of bearing block, it is made to be positioned at the position of needs, to adjust between two rollers
Gap.(each knob should be selected in manual before adjusting) its concrete operations are as follows: roller gap is adjusted, it can be by upper passive guide roller and lower quilt
The oil cylinder separate regulation of dynamic roller, such as: first adjusting upper passive guide roller, be first shut off lower roll oil cylinder pipeline and accumulator control valve.Then
Rigidity gasket needed for product granularity adjusts is added, and (referring to bearing block position scale, roller then starts oil to when zero for 115mm)
Pump and roller forwarding button (1CT), oil pump push passive roll shaft to accumulator and upper roller oil cylinder back cavity fuel feeding, oil cylinder piston extension
Seat Forward is held, when proceeding to bearing block and pushing down adjustment gasket, oil cylinder back cavity and accumulator oil pressure will rise, after reaching 5Mpa,
It presses advance and stops button.At this moment bearing block position scale is observed, is then repeated if necessary to change gap with adjusting discharging-material size
Movement is stated, increase and decrease adjusts gasket 3 to adjust it.It is above product granularity adjustment programme.It moves down roller adjusting method and moves up roller
It is identical.But it may be noted that each control valve and control button corresponding operation after granularity has adjusted, are such as entered normal operating conditions
Then the automatically controlled mode knob on electric cabinet should be threaded to automated location, such as start long-range control, then by the local/remote on electric cabinet
Knob is threaded to remote location.When the supply of material, the adjusting shims of outfit are made of different-thickness, it should be noted that roller gap when adjustment
It is subject to when adjusting gasket and being compressed by bearing block, increases and decreases gasket when necessary and adjust repeatedly several times.It is complicated to adjust program, adjust needs every time
The time wanted is long, reduces production efficiency, increases production cost.And adjustment is manually carried out, the labor intensity of worker
Greatly, the degree of automation is low.
Existing hydraulic control gap self-checking device includes hydraulic cylinder, accumulator and position sensor, position sensing
Device is arranged on the piston rod of hydraulic cylinder, the pressure due to external impacts of the roller moment by material of crusher, in hydraulic cylinder
The variation of power moment, is not able to maintain balance, cannot keep the position of sensor on piston rod.The oil pump of oil cylinder needs the moment to open
It is dynamic, the position of sensor is kept by proportioning valve positive action, necessarily leads to the variation of roller gap in the course of work, is influenced
The particle size after cracking of material reduces yield rate.
Summary of the invention
It is at low cost in order to solve the above technical problem, the present invention provides a kind of structure is simple, it can reduce the labour of worker
Intensity and dress can easily be automatically adjusted to four-roller crusher roller gap that four-roller crusher roller gap is automatically adjusted
It sets.
The technical solution adopted by the present invention is that: a kind of four-roller crusher roller gap self-checking device, including host computer,
Control cabinet, adjustment device, oil cylinder, upper drive roll, upper driven voller, lower drive roll, lower driven voller and control device；Upper drive roll
Two drive roll bearing blocks of two drive roll bearing blocks and lower drive roll are fixedly mounted on the rack, two of upper driven voller from
Action roller shaft holds seat and the driven voller bearing block of lower driven voller is arranged on the sliding rail of rack, axis of the sliding rail perpendicular to upper driven voller
It is horizontally disposed；It is respectively equipped with an oil cylinder at each driven voller bearing block in rack, the cylinder barrel of oil cylinder is fixedly mounted on machine
On frame, the piston rod of oil cylinder is connect with driven voller bearing block, and the axis of oil cylinder is perpendicular to upper driven voller axis and lower driven roll shaft
Line is horizontally disposed；
Adjustment dress is respectively equipped between two drive roll bearing blocks of upper drive roll and two driven voller bearing blocks of upper driven voller
It sets, adjustment dress is respectively equipped between two drive roll bearing blocks of lower drive roll and two driven voller bearing blocks of lower driven voller
It sets；The adjustment device is mounted on the rack, and adjustment device can control the extension elongation of screw rod, to control driven bearing
Positioning of the seat on slideway, and then control the gap of two rollers；The hydraulic station and pressure transmitter of oil cylinder and adjustment device with
Control cabinet connection, control cabinet are connect with host computer.
In above-mentioned four-roller crusher roller gap self-checking device, the adjustment device includes servo motor, subtracts
Fast device and screw tube, screw rod and mandril, the output shaft of the servo motor and the input axis connection of retarder, screw tube installation
On the shell of retarder, for screw rod through bearing support in screw tube, mandril is equipped with threaded hole, threaded hole and screw rod spiral shell
It connects, mandril is equipped with flat key slot, is connect with screw tube by flat key；The output shaft of retarder is equipped with driving gear, on screw rod
Equipped with driven gear, driving gear is engaged with driven gear, and mandril is arranged towards driven voller bearing block, can control stretching for screw rod
Length out to control the positioning that driven shaft is seated against on slideway, and then controls the gap of two rollers；The servo motor
It is connect by servo controller with control cabinet.
Compared with prior art, the beneficial effects of the present invention are:
The configuration of the present invention is simple, it is at low cost, and also the present invention drives servo motor using adjustment device, and spiral shell is controlled after speed reducer
The extension elongation of bar to control the positioning that driven shaft is seated against on slideway, and then controls the gap of two rollers, adjusts device
The pin-lift arrangement driven after being slowed down using servo motor is realized automatic control and real time position data feedback, avoided every time
Manual operation when gap is adjusted, adjusting efficiency is improved, reduces the labor intensity and cost of labor of worker, and improve
Degree of regulation realizes a unmanned key operation.
Detailed description of the invention
Fig. 1 is the structure chart of existing four-roller crusher roller gap regulating device.
Fig. 2 is structure chart of the invention.
Fig. 3 is control flow chart of the invention
Fig. 4 is the structure chart of adjustment device of the invention.
Specific embodiment
Following further describes the present invention with reference to the drawings.
As in Figure 2-4, the present invention include host computer, control cabinet, adjustment device 5, oil cylinder, upper drive roll, upper driven voller,
Lower drive roll, lower driven voller and control device；Two drive roll bearing blocks 4 of upper drive roll and two drive rolls of lower drive roll
Bearing block is fixedly mounted on the rack, and two driven voller bearing blocks 2 of upper driven voller and the driven voller bearing block of lower driven voller are set
It sets on the sliding rail of rack, sliding rail is arranged perpendicular to the axis horizontal of upper driven voller；Close to each driven voller bearing block in rack
Place is respectively equipped with an oil cylinder 1, and the cylinder barrel of oil cylinder 1 is fixedly mounted on the rack, the piston rod of oil cylinder 1 and corresponding driven voller
Bearing block 2 connects, and the axis of oil cylinder 1 is horizontally disposed perpendicular to upper driven voller axis and lower driven voller axis；Correspondence can be driven
Driven voller bearing block 2 moved along sliding rail.
Tune is respectively equipped between two drive roll bearing blocks of upper drive roll and two driven voller bearing blocks of upper driven voller
Engagement positions 5 are respectively equipped with tune between two drive roll bearing blocks of lower drive roll and two driven voller bearing blocks of lower driven voller
Engagement positions 5.The adjustment device 5 is mounted on the rack, and adjustment device 5 can control the extension elongation of screw rod, to control
Driven shaft is seated against the positioning on slideway, and then controls the gap of two rollers.The hydraulic station and pressure transmitter and tune of oil cylinder 1
Engagement positions 5 are connect with control cabinet, and control cabinet is connect with host computer and tele-control system.
As shown in figure 3, the adjustment device includes servo motor 51, retarder 52 and screw tube 53, screw rod 54 and top
Bar 55, the output shaft of the servo motor 51 and the input axis connection of retarder 52, screw tube 53 are mounted on retarder 52
On shell, for screw rod 54 through bearing support in screw tube 53, mandril 55 is equipped with threaded hole, and threaded hole is spirally connected with screw rod 54,
Mandril 55 is equipped with flat key slot, is connect with screw tube 53 by flat key, and flat key can prevent mandril 55 from rotating, therefore screw rod 54
Rotation can be converted into the translation of mandril 55.The output shaft of retarder 52 is equipped with driving gear 56, and screw rod 54 is equipped with driven
Gear 57, driving gear 56 are engaged with driven gear 57, and mandril 55 is arranged towards driven voller bearing block 2, can control screw rod 54
Extension elongation.Servo motor 51 is connect by servo controller with control cabinet, and control cabinet controls servo motor 51 and acts.More
The control cabinet of the roller gap self-checking device of four-roller crusher shares a host computer.
Steps are as follows for roller gap automatic adjustment by the present invention:
(1) control cabinet control adjustment device 5 and oil cylinder 1 are retracted into initial position；0mm stretches out state.
(2) then control oil cylinder 1 pushes crusher driven voller bearing block 2 to being pushed forward, until the drive roll of crusher and from
Dynamic roller contacts with each other, and roller gap is zero at this time, i.e. roller gap school zero.The pressure of hydraulic system rises to 5Mpa simultaneously, this pressure
Power can be set as needed, and then be automatically stopped oil pump, 1 stopping of oil cylinder movement.
(3) control cabinet control servo motor 51 is opened, and will adjust the mandril 55 of device 5 to being pushed forward, until mandril 55 with from
Action roller shaft holds seat 2 and contacts with each other, meanwhile, 51 feedback signal of servo motor is watched after consistent with the signal of setting to control device
It takes motor 51 and is automatically stopped movement.
(4) control cabinet control oil pump is opened, and in place by the retraction of oil cylinder 1, the pressure of the rodless cavity of oil cylinder 1 is zeroed.
(5) control cabinet controls the starting of servo motor 51 again, the mandril 55 for adjusting device 5 is pushed forward, the distance root of release
(upper roller gap 6mm, lower roll gap 2mm) is determined according to the gap needed between drive roll and driven voller, this numerical value is in control device
In it is pre-set；51 feedback signal of servo motor is to control device simultaneously, when the signal value of feedback is identical as setting value
Stopping movement.
(6) control oil pump starts control cabinet again, and the piston rod of oil cylinder 1 is pushed forward, driven voller bearing block 2 is driven to be pushed forward,
Until driven voller bearing block 2 withstands the mandril 55 of adjustment device, oil pressure rises, and reaches the upper of the crusher operating pressure of setting
Limit, oil pump stop, by hydraulic system accumulator automatic pressure-maintaining, when the pressure of hydraulic system drops to the crusher work of setting
When the lower limit of pressure, start oil pump, be automatically replenished pressure to oil cylinder 5, guarantees that broken operating pressure is stablized between bound.
After crusher works a period of time abrasion, again between one-key start roller gap automatic control program completion roller
Gap adjust automatically.
Claims (2)
1. a kind of four-roller crusher roller gap self-checking device, it is characterized in that: include host computer, control cabinet, adjustment device,
Oil cylinder, upper drive roll, upper driven voller, lower drive roll, lower driven voller and control device；Two drive roll bearing blocks of upper drive roll
Be fixedly mounted on the rack with two drive roll bearing blocks of lower drive roll, two driven voller bearing blocks of upper driven voller and under from
The driven voller bearing block of dynamic roller is arranged on the sliding rail of rack, and sliding rail is arranged perpendicular to the axis horizontal of upper driven voller；In rack
An oil cylinder is respectively equipped at each driven voller bearing block, the cylinder barrel of oil cylinder is fixedly mounted on the rack, the piston of oil cylinder
Bar is connect with driven voller bearing block, and the axis of oil cylinder is horizontally disposed perpendicular to upper driven voller axis and lower driven voller axis；
Adjustment dress is respectively equipped between two drive roll bearing blocks of upper drive roll and two driven voller bearing blocks of upper driven voller
It sets, adjustment dress is respectively equipped between two drive roll bearing blocks of lower drive roll and two driven voller bearing blocks of lower driven voller
It sets；The adjustment device is mounted on the rack, and adjustment device can control the extension elongation of screw rod, to control driven bearing
Positioning of the seat on slideway, and then control the gap of two rollers；The hydraulic station and pressure transmitter of oil cylinder and adjustment device with
Control cabinet connection, control cabinet are connect with host computer.
2. four-roller crusher roller gap self-checking device according to claim 1, it is characterized in that: the adjustment fills
It sets including servo motor, retarder and screw tube, screw rod and mandril, the input of the output shaft and retarder of the servo motor
Axis connection, screw tube are mounted on the shell of retarder, and for screw rod through bearing support in screw tube, mandril is equipped with screw thread
Hole, threaded hole are spirally connected with screw rod, and mandril is equipped with flat key slot, are connect with screw tube by flat key；It is set on the output shaft of retarder
There is driving gear, screw rod is equipped with driven gear, and driving gear is engaged with driven gear, and mandril is set towards driven voller bearing block
It sets, the extension elongation of screw rod can be controlled, to control the positioning that driven shaft is seated against on slideway, and then control two rollers
Gap；The servo motor is connect by servo controller with control cabinet.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910783110.2A CN110369035A (en) | 2019-08-23 | 2019-08-23 | Four-roller crusher roller gap self-checking device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910783110.2A CN110369035A (en) | 2019-08-23 | 2019-08-23 | Four-roller crusher roller gap self-checking device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110369035A true CN110369035A (en) | 2019-10-25 |
Family
ID=68260462
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910783110.2A Pending CN110369035A (en) | 2019-08-23 | 2019-08-23 | Four-roller crusher roller gap self-checking device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110369035A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112973868A (en) * | 2021-02-24 | 2021-06-18 | 济南安地冶金机械设备有限公司 | Automatic roller gap adjusting system of four-roller crusher |
Citations (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201304346Y (en) * | 2008-10-16 | 2009-09-09 | 长沙开元仪器有限公司 | Granularity adjusting device for double-roller crusher |
| CN202063892U (en) * | 2011-05-19 | 2011-12-07 | 湖北省林业科学研究院 | Chinese tallow seed decorticator |
| CN102310012A (en) * | 2011-10-19 | 2012-01-11 | 长沙开元仪器股份有限公司 | Roll crushing mill for laboratory use and its mechanical pointer display unit |
| CN202290150U (en) * | 2011-10-27 | 2012-07-04 | 江油晟达机电装备有限责任公司 | Two-stage teeth-roller cracker |
| CN202983758U (en) * | 2012-06-12 | 2013-06-12 | 广东巨大重型机械有限公司 | Four-roller crusher |
| CN203853109U (en) * | 2014-04-25 | 2014-10-01 | 墨江酒江酒业有限公司 | Crusher |
| CN104772186A (en) * | 2015-03-30 | 2015-07-15 | 南京梅山冶金发展有限公司 | Control method for roller-gap maintaining and resistance-free starting before starting-up of four-roller crusher |
| CN104772187A (en) * | 2015-03-30 | 2015-07-15 | 南京梅山冶金发展有限公司 | Control method for automatic adjusting of roller gap of four-roller crusher |
| CN109046560A (en) * | 2018-09-20 | 2018-12-21 | 郑州长城冶金设备有限公司 | Kibbler roll |
| CN109896325A (en) * | 2019-03-01 | 2019-06-18 | 中建材（合肥）粉体科技装备有限公司 | A kind of roll squeezer deviation correcting device and its control method |
| CN209205411U (en) * | 2018-12-13 | 2019-08-06 | 长沙开元仪器有限公司 | A kind of double-roll crusher |
| CN210496599U (en) * | 2019-08-23 | 2020-05-12 | 湘潭市冶金设备制造有限公司 | Automatic roller gap adjusting device of four-roller crusher |
-
2019
- 2019-08-23 CN CN201910783110.2A patent/CN110369035A/en active Pending
Patent Citations (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201304346Y (en) * | 2008-10-16 | 2009-09-09 | 长沙开元仪器有限公司 | Granularity adjusting device for double-roller crusher |
| CN202063892U (en) * | 2011-05-19 | 2011-12-07 | 湖北省林业科学研究院 | Chinese tallow seed decorticator |
| CN102310012A (en) * | 2011-10-19 | 2012-01-11 | 长沙开元仪器股份有限公司 | Roll crushing mill for laboratory use and its mechanical pointer display unit |
| CN202290150U (en) * | 2011-10-27 | 2012-07-04 | 江油晟达机电装备有限责任公司 | Two-stage teeth-roller cracker |
| CN202983758U (en) * | 2012-06-12 | 2013-06-12 | 广东巨大重型机械有限公司 | Four-roller crusher |
| CN203853109U (en) * | 2014-04-25 | 2014-10-01 | 墨江酒江酒业有限公司 | Crusher |
| CN104772186A (en) * | 2015-03-30 | 2015-07-15 | 南京梅山冶金发展有限公司 | Control method for roller-gap maintaining and resistance-free starting before starting-up of four-roller crusher |
| CN104772187A (en) * | 2015-03-30 | 2015-07-15 | 南京梅山冶金发展有限公司 | Control method for automatic adjusting of roller gap of four-roller crusher |
| CN109046560A (en) * | 2018-09-20 | 2018-12-21 | 郑州长城冶金设备有限公司 | Kibbler roll |
| CN209205411U (en) * | 2018-12-13 | 2019-08-06 | 长沙开元仪器有限公司 | A kind of double-roll crusher |
| CN109896325A (en) * | 2019-03-01 | 2019-06-18 | 中建材（合肥）粉体科技装备有限公司 | A kind of roll squeezer deviation correcting device and its control method |
| CN210496599U (en) * | 2019-08-23 | 2020-05-12 | 湘潭市冶金设备制造有限公司 | Automatic roller gap adjusting device of four-roller crusher |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112973868A (en) * | 2021-02-24 | 2021-06-18 | 济南安地冶金机械设备有限公司 | Automatic roller gap adjusting system of four-roller crusher |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN201105382Y (en) | Self-holding swiveling mechanism | |
| CN103615436B (en) | Steel tube straightening machine numerical control electrohydraulic ratio system | |
| CN207176352U (en) | A kind of cloth cutter device | |
| CN105033473A (en) | Self-adaptive press wheel device for laser welding | |
| CN114160879B (en) | Steel pipe fitting feeding and cutting continuous device for automobile bearing part production and using method thereof | |
| CN105065375A (en) | Electro-hydraulic servo pressure device | |
| CN110369035A (en) | Four-roller crusher roller gap self-checking device | |
| CN110193396A (en) | High efficiency smart jaw crusher | |
| CN210496599U (en) | Automatic roller gap adjusting device of four-roller crusher | |
| CN203342841U (en) | Multistage roller press with metered feeding function | |
| CN201941099U (en) | Electric control system of constant-pressure type hydraulic spacing regulating device | |
| CN204525069U (en) | A kind of lock core automatic end facing sand grinding machine | |
| CN202659217U (en) | Automatic regulating apparatus for positions of petroleum pumping unit balance block | |
| CN103862859B (en) | Pressure automatic adjusting system and work method thereof | |
| CN203620675U (en) | Compound pendulum jaw crusher hydraulic backwall | |
| CN201913136U (en) | Hydraulic bending machine for belt processing | |
| CN208592435U (en) | Numerical control angular milling machine | |
| CN209868201U (en) | Automatic grinding device for pen core | |
| CN112872403A (en) | High-speed drilling system based on constant force feed control | |
| CN203209563U (en) | Ball screw pair driving servo positioned feeding mechanism | |
| CN203992203U (en) | Slide block safety protective device | |
| CN111299385B (en) | Automatic hydraulic channeling machine | |
| CN215314867U (en) | Numerical control hydraulic bending machine capable of repeatedly positioning precision | |
| CN211251406U (en) | Hydraulic press actuating mechanism | |
| CN101745995A (en) | Variable pressure hydraulic spacing adjusting device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |