CN215861073U

CN215861073U - Digital hydraulic cylinder

Info

Publication number: CN215861073U
Application number: CN202122026725.6U
Authority: CN
Inventors: 杨涛; 蒋剑军; 杨世祥
Original assignee: Aemetec Co ltd; Aemetec Tianjin Digital Hydraulic Co ltd; Changsha Aemetec Intelligent Technology Co ltd
Current assignee: Aemetec Co ltd; Aemetec Tianjin Digital Hydraulic Co ltd; Changsha Aemetec Intelligent Technology Co ltd
Priority date: 2021-08-25
Filing date: 2021-08-25
Publication date: 2022-02-18
Anticipated expiration: 2031-08-25

Abstract

The utility model discloses a digital hydraulic cylinder which comprises a cylinder barrel and a cylinder seat, wherein a piston rod with a hollow inner part is arranged in the cylinder barrel, one end of the piston rod is connected with a first bearing at the top end of a lead screw through a first piston, the other end of the piston rod is connected with a lead screw nut on the lead screw through a second piston, the lead screw is connected with a second bearing in the cylinder seat at the outer side of the second piston, a first gear is arranged at the tail end of the lead screw and meshed with a second gear at the top end of a transmission rod in the cylinder seat, a third gear at the bottom end of the transmission rod is meshed with a fourth gear on a digital valve, the digital valve is connected with the cylinder seat, a first oil port and a second oil port are arranged in the cylinder barrel, and the first oil port and the second oil port are both connected with the digital valve. According to the digital hydraulic cylinder with the structure, the rotating speed and the number of turns of the lead screw can effectively transfer the speed and the position of the piston rod, and the output flow is regulated through the digital valve, so that the piston rod is accurately controlled, and the digital hydraulic cylinder is more stable and reliable than a magnetostrictive sensor.

Description

Digital hydraulic cylinder

Technical Field

The utility model relates to the technical field of digital 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, in a high-precision positioning device, a common positioning component is a hydraulic cylinder, which not only can provide positioning, but also can provide larger positioning force.

When the existing hydraulic cylinder in the market transmits position and speed signals, a magnetostrictive sensor is mainly used, or a grating is engraved on a piston rod. However, the magnetostrictive sensor has poor anti-interference capability and high requirements on environment, and the processing difficulty and the sealing difficulty of the piston rod grating of the grating type are high.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a digital hydraulic cylinder, which solves the problems of poor anti-interference capability, high processing difficulty and the like of the existing hydraulic cylinder.

In order to achieve the purpose, the utility model provides a digital hydraulic cylinder which comprises a cylinder barrel and a cylinder seat, wherein a piston rod with a hollow inner part is arranged in the cylinder barrel, one end of the piston rod is connected with a first bearing at the top end of a lead screw through a first piston, the other end of the piston rod is connected with a lead screw nut on the lead screw through a second piston, the lead screw is connected with a second bearing in the cylinder seat outside the second piston, the tail end of the lead screw is provided with a first gear, the first gear is meshed with a second gear at the top end of a transmission rod in the cylinder seat, a third gear at the bottom end of the transmission rod is meshed with a fourth gear on a digital valve, the digital valve is connected with the cylinder seat, the cylinder barrel is provided with a first oil port and a second oil port, and the first oil port and the second oil port are both connected with the digital valve.

Preferably, the number of second bearings is two, be equipped with the bearing spacer between the second bearing, be close to first gear the second bearing is connected with the lock sleeve, the retaining member of lock sleeve with the cylinder seat is connected.

Preferably, the second bearing close to one side of the screw nut is connected with a limiting block, and the limiting block is connected with the cylinder base.

Preferably, the transmission rod is connected with the cylinder base through a third bearing, an included angle between the transmission rod and the lead screw is 90 degrees, and an included angle between the digital valve and the piston rod is 180 degrees.

Preferably, the first gear and the second gear are located inside a first moving groove of the cylinder base, the locking sleeve is matched with the first moving groove, and the third gear and the fourth gear are located inside a second moving groove of the cylinder base.

Preferably, the first piston is slidably connected to the piston rod, and the second piston is slidably connected to the cylinder.

Preferably, the screw nut is provided with an internal thread matched with the external thread of the screw.

Preferably, the retaining member is a plug, the bottom of the cylinder base is provided with a fixing groove matched with the retaining member, and the fixing groove is provided with an internal thread matched with an external thread of the retaining member.

Preferably, the first gear, the second gear, the third gear and the fourth gear are all bevel gears.

Therefore, the digital hydraulic cylinder adopting the structure has the following beneficial effects:

1) the rotating speed and the number of turns of the lead screw can effectively transmit the speed and the position of the piston rod, and the output flow is regulated 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) when the screw rod and the piston rod move relatively, the first piston can support the screw rod so that the screw rod cannot be scraped, and the service life is prolonged;

3) by arranging the locking piece, the locking sleeve and the specially designed cylinder base, the assembly space for the product can be effectively provided, so that the lead screw is more convenient to mount;

4) the digital valve and the piston rod are arranged in parallel, so that the mounting distance between all parts in the hydraulic cylinder is shortened, and the axial space is saved.

The technical solution of the present invention is further described in detail by the accompanying drawings and embodiments.

Drawings

FIG. 1 is a side view of a digital hydraulic cylinder of the present invention;

FIG. 2 is a side cross-sectional view of a digital hydraulic cylinder of the present invention;

FIG. 3 is an enlarged view of a portion A of the digital hydraulic cylinder according to the present invention.

Reference numerals

1. A cylinder barrel; 2. a cylinder base; 3. a piston rod; 4. a first piston; 5. a lead screw; 6. a second piston; 7. a first gear; 8. a second gear; 9. a digital valve; 10. a third gear; 11. a first bearing; 12. a lead screw nut; 13. a second bearing; 14. a transmission rod; 15. a fourth gear; 16. a first oil port; 17. a locking sleeve; 18. a locking member; 19. fixing grooves; 20. a first moving slot; 21. a second moving groove.

Detailed Description

The technical solution of the present invention is further illustrated by the accompanying drawings and examples.

Unless defined otherwise, technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this invention belongs. The use of "first," "second," and similar terms in the present application do not denote any order, quantity, or importance, but rather the terms are used to distinguish one element from another. The word "comprising" or "comprises", and the like, means that the element or item listed before the word covers the element or item listed after the word and its equivalents, but does not exclude other elements or items. The terms "connected" or "coupled" and the like are not restricted to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "upper", "lower", "left", "right", and the like are used merely to indicate relative positional relationships, and when the absolute position of the object being described is changed, the relative positional relationships may also be changed accordingly.

Fig. 1 is a side view of a digital hydraulic cylinder of the present invention, fig. 2 is a side sectional view of the digital hydraulic cylinder of the present invention, and fig. 3 is an enlarged view of a portion a of the digital hydraulic cylinder of the present invention, and as shown in the drawing, the digital hydraulic cylinder includes a cylinder tube 1 and a cylinder base 2, and a piston rod 3 having a hollow interior is provided in the cylinder tube 1. One end of the piston rod 3 is connected with a first bearing 11 at the top end of the screw rod 5 through the first piston 4, the other end of the piston rod 3 is connected with a screw nut 12 on the screw rod 5 through the second piston 6, and the screw rod 5 is connected with a second bearing 13 inside the cylinder base 2 outside the second piston 6. The tail end of the screw rod 5 is provided with a first gear 7, the first gear 7 is meshed with a second gear 8 at the top end of a transmission rod 14 in the cylinder base 2, and a third gear 10 at the bottom end of the transmission rod 14 is meshed with a fourth gear 15 on the digital valve 9. The digital valve 9 is connected with the cylinder base 2, the cylinder barrel 1 is provided with a first oil port 16 and a second oil port, and the first oil port 16 and the second oil port are both connected with the digital valve 9. The cylinder barrel 1 and the cylinder base 2 are integrally formed, the piston rod 3 can move relative to the cylinder barrel 1, the lead screw 5 moves relative to the piston rod 3, and when the piston rod 3 moves, the lead screw 5 is driven by the piston rod 3 to rotate. The first gear 7 rotates along with the screw 5, the first gear 7 drives the second gear 8 to rotate, the second gear 8 drives the third gear 10 to rotate through the transmission rod 14, and the third gear 10 drives the fourth gear 15 to rotate. The fourth gear 15 transmits the rotation of the lead screw 5 to the digital valve 9, and the digital valve 9 can adjust the output flow rate, thereby controlling the moving position and the signal of the piston rod 3. The speed and the position of the piston rod 3 can be transmitted by the rotating speed and the number of turns of the lead screw 5, and the digital valve 9 is guaranteed to accurately control the piston rod 3.

The arrangement of the first bearing 11 and the second bearing 13 ensures that the lead screw 5 rotates smoothly along with the piston rod 3, and simultaneously limits the movement direction of the lead screw 5. The arrangement of the first piston 4 provides a supporting function for the screw 5 when sliding relative to the piston rod 3, so that the screw 5 is prevented from moving, and the service life of the screw is prolonged. The second piston 6 is arranged, when the second piston 6 moves along with the piston rod 3, the lead screw nut 12 moves along the lead screw 5 under the driving of the second piston 6, and meanwhile, the lead screw nut 12 limits the moving direction of the lead screw 5. The digital valve 9 is connected with the first oil port 16 and the second oil port, and can control the flow direction and the flow quantity of hydraulic oil in the cylinder barrels 1 at the two ends of the piston rod 3 so as to realize accurate control of the piston rod 3 by the digital valve 9, and is stable and reliable relative to a magnetostrictive sensor.

The number of the second bearings 13 is two, a bearing spacer is arranged between the second bearings 13, the second bearings 13 close to the first gear 7 are connected with a locking sleeve 17, and a locking part 18 of the locking sleeve 17 is connected with the cylinder base 2. The locking sleeve 17 fixes the position of the second bearing 13, and the locking member 18 assists the locking sleeve 17 to lock and fix the second bearing 13. During assembly, the screw 5 firstly extends out of the fixing groove 19 at one end of the cylinder base 2, the second bearing 13, the bearing spacer bush, the second bearing 13, the first gear 7 and the locking sleeve 17 are sequentially installed, and the locking part 18 locks the locking sleeve 17 after the screw 5 returns, so that the screw 5 is more convenient to install.

The second bearing 13 close to one side of the screw nut 12 is connected with a limiting block, and the limiting block is connected with the cylinder base 2. The limiting block is arranged to be matched with the cylinder base 2, so that the screw rod 5 is axially fixed relative to the cylinder base 2.

The transmission rod 14 is connected with the cylinder base 2 through a third bearing, an included angle between the transmission rod 14 and the lead screw 5 is 90 degrees, and an included angle between the digital valve 9 and the piston rod 3 is 180 degrees. The angle between the digital valve 9 and the piston rod 3 is set, and the installation length can be shortened and the axial space in the cylinder base 2 can be saved by matching the positions of the first gear 7 and the transmission rod 14.

The first gear 7 and the second gear 8 are positioned inside a first moving groove 20 of the cylinder base 2, the locking sleeve 17 is matched with the first moving groove 20, and the third gear 10 and the fourth gear 15 are positioned inside a second moving groove 21 of the cylinder base 2. The first moving groove 20 and the second moving groove 21 are provided to leave an assembly space for the first gear 7, the second gear 8, the third gear 10 and the fourth gear 15, thereby ensuring smooth work thereof.

The first piston 4 is connected with the piston rod 3 in a sliding way, and the second piston 6 is connected with the cylinder barrel 1 in a sliding way.

The screw nut 12 is provided with an internal thread matching the external thread of the screw 5.

The locking member 18 is a plug, the bottom of the cylinder base 2 is provided with a fixing groove 19 matched with the locking member 18, and the fixing groove 19 is provided with an internal thread matched with the external thread of the locking member 18. The locking member 18 is connected to the fixing groove 19 of the cylinder base 2 to axially position the movement direction of the screw 5.

The first gear 7, the second gear 8, the third gear 10 and the fourth gear 15 are all bevel gears.

When the digital valve 9 is used, hydraulic oil is controlled to enter the cylinder barrel 1 from the first oil port 16, and the second piston 6 and the piston rod 3 are pushed to extend outwards. When the piston rod 3 and the second piston 6 move, the screw rod 5 rotates along with the piston rod, and the first gear 7 on the screw rod is driven to rotate. The first gear 7 drives the transmission rod 14 to rotate through the second gear 8, and the transmission rod 14 drives the fourth gear 15 to rotate through the third gear 10. After the rotation of the screw 5 is transmitted to the digital valve 9, the digital valve 9 adjusts the output flow rate, and controls the position and the moving speed of the piston rod 3. When oil enters from the second port, the rotation direction is different, and the principle is the same as that of the oil entering from the first port 16.

Therefore, according to the digital hydraulic cylinder with the structure, the rotating speed and the number of turns of the lead screw can effectively transfer the speed and the position of the piston rod, and the output flow is regulated through the digital valve, so that the piston rod is accurately controlled, and the digital hydraulic cylinder is more stable and reliable than a magnetostrictive sensor; when the screw rod and the piston rod move relatively, the first piston can support the screw rod so that the screw rod cannot be scraped, and the service life is prolonged; by arranging the locking piece, the locking sleeve and the specially designed cylinder base, the assembly space for the product can be effectively provided, so that the lead screw is more convenient to mount; the digital valve and the piston rod are arranged in parallel, so that the mounting distance between all parts in the hydraulic cylinder is shortened, and the axial space is saved.

Finally, it should be noted that: the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting the same, and although the present invention is described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that: modifications and equivalents may be made to the utility model without departing from the spirit and scope of the utility model.

Claims

1. A digital hydraulic cylinder, characterized by: the hydraulic cylinder comprises a cylinder barrel and a cylinder seat, wherein a piston rod which is hollow inside is arranged in the cylinder barrel, one end of the piston rod is connected with a first bearing at the top end of a lead screw through a first piston, the other end of the piston rod is connected with a lead screw nut on the lead screw through a second piston, the lead screw is arranged on the outer side of the second piston and connected with a second bearing inside the cylinder seat, a first gear is arranged at the tail end of the lead screw and meshed with a second gear at the top end of a transmission rod inside the cylinder seat, a third gear at the bottom end of the transmission rod is meshed with a fourth gear on a digital valve, the digital valve is connected with the cylinder seat, the cylinder barrel is provided with a first oil port and a second oil port, and the first oil port and the second oil port are both connected with the digital valve.

2. A digital hydraulic cylinder according to claim 1, wherein: the quantity of second bearing is two, be equipped with the bearing spacer sleeve between the second bearing, be close to first gear the second bearing is connected with the lock sleeve, the retaining member of lock sleeve with the cylinder seat is connected.

3. A digital hydraulic cylinder according to claim 1, wherein: the second bearing close to one side of the screw nut is connected with a limiting block, and the limiting block is connected with the cylinder base.

4. A digital hydraulic cylinder according to claim 1, wherein: the transmission rod is connected with the cylinder base through a third bearing, an included angle between the transmission rod and the lead screw is 90 degrees, and an included angle between the digital valve and the piston rod is 180 degrees.

5. A digital hydraulic cylinder according to claim 2, wherein: the first gear and the second gear are located in a first moving groove of the cylinder base, the locking sleeve is matched with the first moving groove, and the third gear and the fourth gear are located in a second moving groove of the cylinder base.

6. A digital hydraulic cylinder according to claim 1, wherein: the first piston is connected with the piston rod in a sliding mode, and the second piston is connected with the cylinder barrel in a sliding mode.

7. A digital hydraulic cylinder according to claim 1, wherein: the screw nut is provided with an internal thread matched with the external thread of the screw.

8. A digital hydraulic cylinder according to claim 2, wherein: the retaining member is the end cap, the cylinder base bottom be equipped with retaining member assorted fixed slot, the fixed slot be equipped with retaining member external screw thread assorted internal thread.

9. A digital hydraulic cylinder according to claim 1, wherein: the first gear, the second gear, the third gear and the fourth gear are all bevel gears.