CN114278645A - Digital hydraulic cylinder - Google Patents
Digital hydraulic cylinder Download PDFInfo
- Publication number
- CN114278645A CN114278645A CN202111554655.XA CN202111554655A CN114278645A CN 114278645 A CN114278645 A CN 114278645A CN 202111554655 A CN202111554655 A CN 202111554655A CN 114278645 A CN114278645 A CN 114278645A
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- Prior art keywords
- ball screw
- piston rod
- bearing
- piston
- bevel gear
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- 230000005540 biological transmission Effects 0.000 claims abstract description 32
- 230000007246 mechanism Effects 0.000 claims abstract description 13
- 230000009471 action Effects 0.000 claims abstract description 3
- 125000006850 spacer group Chemical group 0.000 claims description 5
- 238000009434 installation Methods 0.000 abstract description 3
- 239000003921 oil Substances 0.000 description 7
- 239000010720 hydraulic oil Substances 0.000 description 3
- 238000006073 displacement reaction Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
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Abstract
The invention discloses a digital hydraulic cylinder, which comprises a cylinder seat, a piston rod, a digital valve, a ball screw, a screw nut reverser, a piston, a secondary piston and a gear transmission mechanism, wherein the piston rod is of a hollow structure, the ball screw is arranged in the piston rod, and the outer end of the ball screw is connected with the inner wall of the piston rod in a sliding manner through a first bearing and the secondary piston; when the piston rod moves axially in the cylinder seat, the ball screw rotates under the action of the screw nut reverser, then the rotation is transmitted to the digital valve through the gear transmission mechanism, and the digital valve converts a rotation signal into a pulse signal so as to obtain a position and moving speed signal of the piston rod. The hydraulic cylinder can effectively transmit the speed and the position of the piston rod by the rotating speed and the number of turns of the ball screw, and then the rotating speed and the number of turns of the ball screw are converted into pulse signals through the digital valve, so that the piston rod is accurately controlled; through the parallel arrangement of digital valve and piston rod to use bevel gear transmission, can shorten the installation distance, practice thrift axial space.
Description
Technical Field
The invention relates to the technical field of hydraulic cylinders, in particular to a digital hydraulic cylinder.
Background
Hydraulic pressure is a transmission technology widely applied in industry, and is generally applied to the fields of metal forming, rubber and plastic machinery, heavy machine tools, engineering machinery and the like particularly in the field of linear motion due to superior performances of heavy load, smoothness, impact resistance, durability, reliability and the like.
In the prior art, a common positioning component in a high-precision positioning device is a hydraulic cylinder, and the hydraulic cylinder can provide positioning and also provide larger positioning force.
The position and speed signals transmitted by the hydraulic cylinders in the current market mainly depend on a magnetostrictive sensor or a grating is engraved on a piston rod; although the magnetostrictive sensor has high precision and convenient installation, the magnetostrictive sensor has poor anti-jamming capability and high requirement on environment; the grating is high in processing difficulty and sealing difficulty due to the piston rod grating.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention aims to provide a digital hydraulic cylinder to solve the problems of poor anti-interference capability and high sealing difficulty of a position and speed measuring unit in the prior art.
The invention provides a digital hydraulic cylinder, which comprises a cylinder seat, a piston rod, a digital valve, a ball screw, a screw nut reverser, a piston, a secondary piston and a gear transmission mechanism, wherein the piston rod is of a hollow structure, the ball screw is arranged in the piston rod, and the outer end of the ball screw is connected with the inner wall of the piston rod in a sliding manner through a first bearing (16) and the secondary piston; the piston is arranged at the left end of the piston rod and is in sliding connection with the cylinder base, and the inner end of the ball screw is rotationally connected with the cylinder base through a second bearing (17) and is axially positioned; the lead screw nut reverser is sleeved on the ball screw and is in threaded connection with the ball screw; and the lead screw nut reverser is fixedly connected with the piston.
When the piston rod moves axially in the cylinder seat, the ball screw rotates under the action of the screw nut reverser, then the rotation is transmitted to the digital valve through the gear transmission mechanism, and the digital valve converts a rotation signal into a pulse signal so as to acquire a moving position and a moving speed signal of the piston rod.
Further, the gear transmission mechanism comprises a first bevel gear, a second bevel gear, a transmission rod and a bevel gear set.
Further, the first bevel gear is installed at the inner end of the ball screw, the transmission rod is installed on the cylinder base through a bearing and is perpendicular to the ball screw, the second bevel gear is arranged at one end of the transmission rod and is in gear engagement with the first bevel gear, and the bevel gear set is arranged at the other end of the transmission rod and is connected with the digital valve.
Furthermore, the left end of the ball screw is sequentially provided with a second bearing, a bearing spacer bush and a second bearing from inside to outside and is locked and fixed through a nut.
Furthermore, a bearing locking sleeve is arranged on the outer side of the bearing on the left side, a plug is arranged on the outer side of the bearing locking sleeve, and the plug is connected with the cylinder base and used for axially positioning the ball screw.
And furthermore, a limiting block is arranged on the outer side of the second bearing on the right side, and the limiting block is connected with the cylinder base and used for axially positioning the second bearing and the ball screw.
The digital hydraulic cylinder provided by the invention has the following beneficial effects: 1) the rotating speed and the number of turns of the ball screw can effectively transmit the speed and the position of the piston rod, and then the rotating speed and the number of turns of the ball screw are converted into pulse signals through the digital valve, so that the piston rod is accurately controlled, and the sensor is more stable and reliable than a magnetostrictive sensor; 2) the secondary piston of the piston rod at one end of the ball screw can support the screw rod while moving relative to the piston rod, so that the screw rod cannot be scraped, and the service life is shortened; 3) by arranging the plug, the bearing locking sleeve and the specially designed cylinder base, a space can be effectively provided for the assembly of a product, so that the ball screw is more convenient to install; 4) through the parallel arrangement of digital valve and piston rod to use bevel gear transmission, can shorten the installation distance, practice thrift axial space.
In addition to the objects, features and advantages described above, other objects, features and advantages of the present invention are also provided. The present invention will be described in further detail below with reference to the drawings.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:
FIG. 1 is a schematic structural diagram of a digital hydraulic cylinder according to the present invention;
FIG. 2 is a schematic view of the internal structure of the digital hydraulic cylinder of the present invention;
fig. 3 is a partially enlarged view of the internal structure of the digital cylinder of the present invention.
Description of the reference numerals
1. A cylinder base; 2. a piston rod; 3. a digital valve; 4. an oil port A; 5. a ball screw; 6. a lead screw nut reverser; 7. a piston; 8. a secondary piston; 9. a first bevel gear; 10. a second bevel gear; 11. a transmission rod; 12. a bearing locking sleeve; 13. a bearing spacer; 14. a bevel gear set; 15. a plug; 16. a first bearing; 17. and a second bearing.
Detailed Description
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
As shown in fig. 1 and 2, the digital hydraulic cylinder of the present invention includes a cylinder base 1, a piston rod 2, a ball screw 5, a screw nut reverser 6, a piston 7, a secondary piston 8, a gear transmission mechanism, and a digital valve 3, wherein the digital valve 3 operates, hydraulic oil is introduced into the cylinder base 1 from an oil port a to push the piston rod 2 to move axially, the ball screw 5 performs a rotational motion under the limitation of the screw nut reverser 6, then the rotation is transmitted to the digital valve 3 through the gear transmission mechanism, and the digital valve 3 converts a rotational signal into a pulse signal, thereby obtaining a moving position and a speed signal of the piston rod 2.
Specifically, the inner end of the piston rod 2 is provided with a piston 7, so that the piston rod 2 can move linearly in the cylinder seat 1 and keep sealed, wherein the piston rod 2 is of a hollow structure, a ball screw 5 is arranged inside the piston rod 2, and the outer end of the ball screw 5 is provided with a first bearing 16 and a second-stage piston 8, so that the ball screw 5 can rotate in the piston rod 2 and is connected with the inner wall of the piston rod 2 in a sliding manner through the second-stage piston 8. Wherein, the secondary piston 8 can support the ball screw while moving relative to the piston rod 2, so that the ball screw cannot be scraped, and the service life is shortened.
The other end of the ball screw 5 is rotatably connected with the cylinder base 1 through a second bearing 17 and is axially fixed through a limiting block, and the screw nut reverser 6 is sleeved on the ball screw 5 and is in threaded connection with the ball screw 5; meanwhile, the screw nut reverser 6 is fixedly connected with a piston 7 at the inner end of the piston rod 2 through a bolt. When the piston rod 2 moves axially, the ball screw 5 can be driven to move spirally relative to the piston rod 2.
Specifically, as shown in fig. 2 and 3, the gear transmission mechanism includes a bevel gear one 9, a bevel gear two 10, a transmission rod 11, and a bevel gear set, wherein the bevel gear one 9 is installed at one end of the inner side of the ball screw 5, the transmission rod 11 is installed on the cylinder block 1 through a bearing and is arranged perpendicular to the ball screw 5, the bevel gear two 10 is arranged at one end of the transmission rod 11 and is in gear engagement with the bevel gear one 9, the bevel gear set 14 is arranged at the other end of the transmission rod 11, and the bevel gear set 14 is in transmission connection with the digital valve, so as to transmit the rotation motion of the ball screw 5 to the digital valve 3.
The digital valve 3 is connected with an oil port A and an oil port B on the cylinder seat, the flow direction of hydraulic oil in cavities at two ends of the piston rod 2 can be controlled, rotation signals can be converted into pulse signals, specifically, signals such as the rotation number of turns and the speed of a ball screw corresponding to the displacement and the speed of the piston rod 2 can be received, the signals are converted into the rotation number of turns and the rotation speed of an electromagnetic coil in the digital valve 3, pulse signals are formed, and then an external controller can obtain the displacement and the speed signals of the piston rod 2, so that the piston rod can be accurately controlled, and the digital valve is stable and reliable relative to a magnetostrictive sensor.
Specifically, as shown in fig. 2 and 3, the left end of the ball screw 5 is provided with a stepped shaft shoulder, the left end of the ball screw 5 is sequentially provided with a second bearing 17, a second bearing spacer 13 and a second bearing 17 from inside to outside and is locked and fixed through a nut, and the first bevel gear 9 is fixed at the tail end of the ball screw 5 through a screw and a flat key; the bearing locking sleeve 12 is arranged on the outer side of the bearing II 17 on the left side, the plug 15 is arranged on the outer side of the bearing locking sleeve 12, the plug 15 is connected with the cylinder base 1, the limiting block is arranged on the outer side of the bearing II 17 on the right side, and the limiting block is connected with the cylinder base 1, so that the ball screw 5 is axially fixed relative to the cylinder base 1.
The assembly structure comprises a plug 15, a bearing locking sleeve 12 and a specially designed cylinder base, wherein a space can be effectively provided for assembly of a product, the ball screw 5 extends out of a threaded hole in one end of the cylinder base during assembly, a bearing II, a bearing spacer bush, a bearing II, a bevel gear I9 and the bearing locking sleeve 12 are sequentially installed, and finally the ball screw 5 returns to the original position and then is locked by the plug 15; the ball screw is more convenient to install.
The working principle and the working process of the invention are briefly described below with reference to the accompanying drawings.
When the digital valve 3 controls hydraulic oil to enter the rodless cavity from the oil port A, the piston 7 and the piston rod 2 are pushed to extend rightwards, the left end of the ball screw 5 is fixed on the cylinder seat 1, and the screw nut reverser 6 is fixed on the piston 7, so that when the piston rod 2 and the piston 7 move, the ball screw 5 is driven to rotate, the ball screw 5 drives the bevel gear I9 fixed on the ball screw 5 to rotate when rotating, the bevel gear I9 is meshed with the bevel gear II 10, the transmission rod 11 and the bevel gear group 14 are driven to rotate, the rotation of the ball screw 5 is transmitted to the rotating speed receiver of the digital valve 3, and further the position and moving speed signals of the piston rod 2 are obtained. When oil enters from the oil port B, the rotation direction is different, and the principle is the same.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (6)
1. A digital hydraulic cylinder is characterized by comprising a cylinder seat (1), a piston rod (2), a digital valve (3), a ball screw (5), a screw nut reverser (6), a piston (7), a secondary piston (8) and a gear transmission mechanism,
the piston rod (2) is of a hollow structure, a ball screw (5) is arranged in the piston rod (2), and the outer end of the ball screw (5) is connected with the inner wall of the piston rod (2) in a sliding mode through the first bearing (16) and the second-stage piston (8); the piston (7) is arranged at the left end of the piston rod (2) and is connected with the cylinder base (1) in a sliding way,
the inner end of the ball screw (5) is rotationally connected with the cylinder base (1) through a second bearing (17) and is axially positioned; the lead screw nut reverser (6) is sleeved on the ball screw (5) and is in threaded connection with the ball screw; the screw nut reverser (6) is fixedly connected with the piston (7);
one end of the gear transmission mechanism is in transmission connection with the ball screw (5), the other end of the gear transmission mechanism is in transmission connection with the digital valve (3), when the piston rod (2) moves axially in the cylinder seat (1), the ball screw (5) rotates under the action of the screw nut reverser (6), then the rotation is transmitted to the digital valve (3) through the gear transmission mechanism, and the digital valve (3) converts a rotation signal into a pulse signal so as to obtain a moving position and a moving speed signal of the piston rod (2).
2. The digital hydraulic cylinder according to claim 1, wherein the gear transmission mechanism comprises a bevel gear one (9), a bevel gear two (10), a drive rod (11), and a bevel gear set (14).
3. The digital hydraulic cylinder according to claim 2, characterized in that the bevel gear one (9) is mounted at the inner end of the ball screw (5), the transmission rod (11) is mounted on the cylinder base (1) through a bearing and is arranged perpendicular to the ball screw (5), the bevel gear two (10) is arranged at one end of the transmission rod (11) and is in gear engagement with the bevel gear one (9), and the bevel gear set (14) is arranged at the other end of the transmission rod (11) and is connected with the digital valve (3).
4. The digital hydraulic cylinder according to claim 3, wherein the left end of the ball screw (5) is provided with a second bearing (17), a second bearing spacer (13) and a second bearing (17) in sequence from inside to outside, and the bearings are locked and fixed through nuts.
5. The digital hydraulic cylinder according to claim 4, characterized in that a bearing locking sleeve (12) is arranged on the outer side of the second bearing (17) on the left side, a plug (15) is arranged on the outer side of the bearing locking sleeve (12), and the plug (15) is connected with the cylinder base (1) and used for axially positioning the ball screw (5).
6. The digital hydraulic cylinder according to claim 5, wherein a limiting block is arranged on the outer side of the second bearing (17) on the right side, and the limiting block is connected with the cylinder base (1) and used for axially positioning the second bearing (17) and the ball screw (5).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111554655.XA CN114278645A (en) | 2021-12-17 | 2021-12-17 | Digital hydraulic cylinder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111554655.XA CN114278645A (en) | 2021-12-17 | 2021-12-17 | Digital hydraulic cylinder |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114278645A true CN114278645A (en) | 2022-04-05 |
Family
ID=80872926
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111554655.XA Pending CN114278645A (en) | 2021-12-17 | 2021-12-17 | Digital hydraulic cylinder |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114278645A (en) |
Citations (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11320457A (en) * | 1998-04-02 | 1999-11-24 | Jc Bamford Excavators Ltd | Position measuring device of movable mechanical element and marking method for mechanical element |
| US20050081710A1 (en) * | 2003-10-17 | 2005-04-21 | Clark Equipment Company | Method and apparatus for stroke position sensor for hydraulic cylinder |
| US7997398B1 (en) * | 2008-03-31 | 2011-08-16 | Brunswick Corporation | Hydraulically actuated marine transmission |
| EP2584570A1 (en) * | 2011-10-21 | 2013-04-24 | Metso Paper Inc. | Booster for a digital hydraulic controller and method for using a booster in connection with a digital hydraulic controller |
| CN104930014A (en) * | 2015-06-05 | 2015-09-23 | 上海美西为机电设备有限公司 | Digital servo hydraulic cylinder |
| WO2019073750A1 (en) * | 2017-10-13 | 2019-04-18 | 日立オートモティブシステムズ株式会社 | Electrically operated brake device |
| CN211231059U (en) * | 2019-11-28 | 2020-08-11 | 徐州海伦哲特种车辆有限公司 | Digital hydraulic leveling system of working platform of overhead working truck |
| CN111923874A (en) * | 2020-08-12 | 2020-11-13 | 北京航天发射技术研究所 | Electric cylinder supporting leg, vehicle and quick leveling method |
| CN112431812A (en) * | 2020-12-04 | 2021-03-02 | 徐州徐工液压件有限公司 | Lead screw displacement self-detecting hydraulic cylinder |
| CN113124019A (en) * | 2021-04-30 | 2021-07-16 | 中国重型机械研究院股份公司 | Digital logic valve array hydraulic servo control system, control method and fault diagnosis method |
| CN113494502A (en) * | 2021-08-05 | 2021-10-12 | 六盘水师范学院 | Digital hydraulic cylinder |
| CN113530917A (en) * | 2021-08-25 | 2021-10-22 | 长沙亿美博智能科技有限公司 | Digital hydraulic cylinder |
| WO2021217885A1 (en) * | 2020-04-27 | 2021-11-04 | 苏州舍勒智能科技有限公司 | New small-specification compact type electric push rod cylinder |
-
2021
- 2021-12-17 CN CN202111554655.XA patent/CN114278645A/en active Pending
Patent Citations (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11320457A (en) * | 1998-04-02 | 1999-11-24 | Jc Bamford Excavators Ltd | Position measuring device of movable mechanical element and marking method for mechanical element |
| US20050081710A1 (en) * | 2003-10-17 | 2005-04-21 | Clark Equipment Company | Method and apparatus for stroke position sensor for hydraulic cylinder |
| US7997398B1 (en) * | 2008-03-31 | 2011-08-16 | Brunswick Corporation | Hydraulically actuated marine transmission |
| EP2584570A1 (en) * | 2011-10-21 | 2013-04-24 | Metso Paper Inc. | Booster for a digital hydraulic controller and method for using a booster in connection with a digital hydraulic controller |
| CN104930014A (en) * | 2015-06-05 | 2015-09-23 | 上海美西为机电设备有限公司 | Digital servo hydraulic cylinder |
| WO2019073750A1 (en) * | 2017-10-13 | 2019-04-18 | 日立オートモティブシステムズ株式会社 | Electrically operated brake device |
| CN211231059U (en) * | 2019-11-28 | 2020-08-11 | 徐州海伦哲特种车辆有限公司 | Digital hydraulic leveling system of working platform of overhead working truck |
| WO2021217885A1 (en) * | 2020-04-27 | 2021-11-04 | 苏州舍勒智能科技有限公司 | New small-specification compact type electric push rod cylinder |
| CN111923874A (en) * | 2020-08-12 | 2020-11-13 | 北京航天发射技术研究所 | Electric cylinder supporting leg, vehicle and quick leveling method |
| CN112431812A (en) * | 2020-12-04 | 2021-03-02 | 徐州徐工液压件有限公司 | Lead screw displacement self-detecting hydraulic cylinder |
| CN113124019A (en) * | 2021-04-30 | 2021-07-16 | 中国重型机械研究院股份公司 | Digital logic valve array hydraulic servo control system, control method and fault diagnosis method |
| CN113494502A (en) * | 2021-08-05 | 2021-10-12 | 六盘水师范学院 | Digital hydraulic cylinder |
| CN113530917A (en) * | 2021-08-25 | 2021-10-22 | 长沙亿美博智能科技有限公司 | Digital hydraulic cylinder |
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