CN211474570U - Swing hydraulic cylinder with gear rack structure - Google Patents
Swing hydraulic cylinder with gear rack structure Download PDFInfo
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- CN211474570U CN211474570U CN201922220325.1U CN201922220325U CN211474570U CN 211474570 U CN211474570 U CN 211474570U CN 201922220325 U CN201922220325 U CN 201922220325U CN 211474570 U CN211474570 U CN 211474570U
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Abstract
The utility model relates to a swing hydraulic cylinder with a gear rack structure, wherein two ends of a rack piston are provided with pistons, the middle part of the rack piston is provided with a rack, the rack piston is arranged in a cylinder body and is in clearance fit connection with the cylinder body, the rack is in meshed connection with a gear arranged in a bearing seat, the gear is circumferentially connected with a transmission shaft through a key, two ends of the cylinder body are respectively provided with an end cover, and the end cover is provided with a hydraulic cylinder oil inlet communicated with the cylinder body; a gap buffering throttling structure is arranged between the piston and the end cover; an oil inlet of the hydraulic cylinder is communicated with pressure oil to push a rack piston to linearly move in a cylinder body, a rack is meshed with a gear to drive the gear to rotate and drive a transmission shaft to synchronously rotate, so that the thrust of the hydraulic oil to the rack piston is converted into the output torque of the transmission shaft, and the swinging motion of an actuating mechanism is realized. The utility model discloses a rack and pinion structure turns into actuating mechanism's rotary motion with the linear motion of pneumatic cylinder, compact structure, and the transmission is reliable, and degree of automation is higher.
Description
Technical Field
The utility model relates to a swing hydraulic cylinder, especially a digit control machine tool upset swing mechanism's oil hydraulic cylinder.
Background
Along with the development of the manufacturing industry, the automation degree of the numerical control machine tool is improved, and the swing hydraulic cylinder is widely applied. The swing hydraulic cylinder structure adopting the blade form, such as a single blade, a double blade, a triple blade and the like, has a small output moment generally due to the fact that the realized swing angle is related to the number of the blades, and the application of the swing hydraulic cylinder structure is limited to a certain extent. In the turning and swinging mechanism of the numerical control machine tool, not only the rotating speed is required to be low, but also the torque required to be output is large, so that a swinging hydraulic cylinder with low speed and large torque is required to be developed.
Disclosure of Invention
The utility model aims to solve the technical problem that overcome prior art not enough, provide a swing hydraulic cylinder of rack and pinion structure with big moment of torsion of low-speed.
In order to solve the technical problem, the utility model adopts the following technical scheme: a rack and pinion structure swing hydraulic cylinder comprises a cylinder body, a rack piston, a transmission shaft, a bearing seat and end covers, wherein pistons are arranged at two ends of the rack piston, a rack is arranged in the middle of the rack piston, the rack piston is arranged in the cylinder body and is in clearance fit connection with the cylinder body, the rack is in meshed connection with a gear arranged in the bearing seat, the gear is circumferentially connected with the transmission shaft through a key, the two ends of the cylinder body are respectively provided with the end covers, and the end covers are provided with hydraulic cylinder oil inlets communicated with the cylinder body; a gap buffering throttling structure is arranged between the piston and the end cover; an oil inlet of the hydraulic cylinder is communicated with pressure oil to push a rack piston to linearly move in a cylinder body, a rack is meshed with a gear to drive the gear to rotate and drive a transmission shaft to synchronously rotate, so that the thrust of the hydraulic oil to the rack piston is converted into the output torque of the transmission shaft, and the swinging motion of an actuating mechanism is realized.
Furthermore, sealing rings are arranged at two ends of the rack piston and are connected with the cylinder body in a sealing mode through the sealing rings.
Further, a gap is formed in the back of the rack and is used for fully lubricating the rack and the cylinder body.
Furthermore, the clearance buffering throttling structure is composed of an inner hole formed in the end face of the rack piston and a cylindrical table arranged on the inner end face of the end cover, the inner hole of the end face of the rack piston is matched with the cylindrical table of the end cover, and a clearance is formed between the inner hole and the cylindrical table and used for buffering throttling.
Further, a safety positioning mechanism is arranged between the cylinder body and the rack piston and consists of a pin shaft, a valve seat and a spring, the valve seat is fixedly connected to the upper surface of the outer side of the cylinder body, the pin shaft is movably connected in the valve seat, a circumferential boss is arranged in the middle of the pin shaft, the upper end of the circumferential boss is communicated with a hydraulic pressure inlet and outlet channel in the cylinder body, and the lower end of the circumferential boss is connected with the spring; and a groove matched with the pin shaft is formed in the periphery of the rack piston.
Further, a radial sealing ring is arranged between the pin shaft and the valve seat.
Compared with the prior art, the beneficial effects of the utility model reside in that: the rack and pinion structure is adopted to convert the linear motion of the hydraulic cylinder into the rotary motion of the actuating mechanism, the structure is compact, the transmission is reliable, and the degree of automation is high.
After the hydraulic cylinder finishes the swinging action, the safety of a machine tool is considered, a safety positioning bolt is added during the structural design of the hydraulic cylinder, and the swinging mechanism is prevented from automatically falling due to dead weight to cause safety accidents. The cylinder body is divided into a left section and a right section, and a gap is formed between the two sections of the cylinder body and the back of the rack, so that the lubricating performance between the rack and the cylinder body is improved, and the motion stability of the swing hydraulic cylinder is ensured. The middle part of the cylinder body of the hydraulic cylinder is provided with a rack which is meshed with a gear sleeved on a transmission shaft, and the transmission shaft is connected with a power output shaft. The whole structure is simple, the design is scientific and reasonable, the maintenance is convenient, and the service life is long.
Drawings
Fig. 1 is a schematic structural view of a rack and pinion structure swing hydraulic cylinder of the present invention;
FIG. 2 is a cross-sectional view A-A of the swing hydraulic cylinder of the rack and pinion configuration shown in FIG. 1;
FIG. 3 is a detail view of a rack piston of the oscillating hydraulic cylinder of the rack and pinion configuration shown in FIG. 1;
wherein: (a) front view, (B) a sectional view B-B.
Detailed Description
The present invention will be further explained with reference to the drawings and examples.
As shown in fig. 1 to fig. 3(a) and (b), the swing hydraulic cylinder with a gear-rack structure mainly comprises a steel ball 1, a spring 2, a piston front end cover 3, a seal ring 4, a rack piston 5, a valve seat 6, a pin shaft 7, a spring 8, a seal ring 9, a seal ring 10, a cylinder body 11, a piston rear end cover 12, a transmission shaft 13, a front end cover 14, a front bearing 15, a front bearing seat 16, a gear 17, a key 18, a rear bearing seat 19, a rear bearing 20 and a rear end cover 21. The two ends of the rack piston 5 are provided with a piston 501 and a piston 503, the middle is provided with a rack 502, the rack piston 5 is arranged in the cylinder body 11, the piston 501, the piston 503 and the cylinder body 11 are in clearance fit, the two ends of the rack piston 5 are provided with sealing rings 4 for sealing, the piston front end cover 3 and the piston rear end cover 12 are fixedly connected with the cylinder body 11 through screws, and the gear 17 is circumferentially connected with the transmission shaft 13 through a key 18 and then meshed with the rack 502.
Considering the safety of the action of the machine tool, a safety positioning mechanism is added during the structural design of the hydraulic cylinder, plays a role in safety positioning, and prevents the swing mechanism from automatically falling due to dead weight to cause safety accidents.
The safety positioning mechanism is composed of a pin shaft 7, a valve seat 6 and a spring 8, the valve seat 6 is fixedly connected to the outer side of the cylinder body 11 through a screw, the pin shaft 7 is movably connected in the valve seat 6, a circumferential boss is arranged in the middle of the pin shaft 7, the upper end of the circumferential boss is communicated with a hydraulic pressure inlet channel and a hydraulic pressure outlet channel in the cylinder body 11, and the hydraulic pressure inlet channel and the hydraulic pressure outlet channel are respectively communicated with an oil inlet C and an oil drain. The lower end of the circumferential boss is connected with a spring 8; and a groove matched with the pin shaft is arranged on the periphery of the rack piston 5. The insertion of the pin shaft 7 is controlled by overcoming the frictional resistance through the spring 8, the pulling-out of the pin shaft 7 is controlled through hydraulic pressure, and a guide part is added at the position where the pin shaft 7 is connected with the cylinder body 11, so that the reliability of the action of inserting and pulling the pin shaft 7 is facilitated, a radial sealing ring 9 is arranged between the pin shaft 7 and the valve seat 6, and an axial sealing ring 10 is arranged between the valve seat 6 and the cylinder body 11, so that the action failure of the hydraulic cylinder caused by hydraulic leakage is avoided. When the hydraulic cylinder needs to swing, the safety pin shaft 7 must be pulled out from the piston groove under the action of hydraulic pressure, then an oil inlet A or an oil inlet B of the hydraulic cylinder is communicated with pressure oil to push the rack piston 5 to linearly move in the cylinder body 11, the rack 502 is meshed with the gear 17 to drive the gear 17 to rotate and drive the transmission shaft 13 to synchronously rotate, and the thrust of the hydraulic oil to the rack piston 5 is converted into the output torque of the transmission shaft 13 in the whole transmission process, so that the swing motion of the actuating mechanism is realized. In order to avoid the impact phenomenon caused by the movement inertia of the swing hydraulic cylinder, a gap 301 is arranged between the front end cover 3 and the rear end cover 12 which are connected with the two ends of the rack piston 5 and the cylinder body 11, the gap has the functions of buffering and throttling, the movement stability and the reliability of the hydraulic cylinder are greatly improved, and the transmission precision of a machine tool is ensured. In addition, the piston is divided into a left section 501 and a right section 503, and a gap is arranged at the back of the rack 502, so that the full lubrication between the rack 502 and the cylinder body 11 is facilitated, the indirect contact surface with the cylinder body 11 is reduced, and the motion stability of the swing hydraulic cylinder is ensured. Overall structure is simple, and reasonable in design has effectively avoided hydro-cylinder fish tail scheduling problem, has prolonged pneumatic cylinder life, reduces the use cost of lathe etc..
Claims (6)
1. The utility model provides a rack and pinion structure swing hydraulic cylinder, includes cylinder body, rack piston, transmission shaft, bearing frame, end cover, its characterized in that: the two ends of the rack piston are pistons, the middle of the rack piston is a rack, the rack piston is arranged in the cylinder body and is in clearance fit connection with the cylinder body, the rack is in meshed connection with a gear arranged in a bearing seat, the gear is circumferentially connected with a transmission shaft through a key, the two ends of the cylinder body are respectively provided with an end cover, and the end covers are provided with hydraulic cylinder oil inlets communicated with the cylinder body; a gap buffering throttling structure is arranged between the piston and the end cover; an oil inlet of the hydraulic cylinder is communicated with pressure oil to push a rack piston to linearly move in a cylinder body, a rack is meshed with a gear to drive the gear to rotate and drive a transmission shaft to synchronously rotate, so that the thrust of the hydraulic oil to the rack piston is converted into the output torque of the transmission shaft, and the swinging motion of an actuating mechanism is realized.
2. The rack and pinion structural swing hydraulic cylinder according to claim 1, wherein: and sealing rings are arranged at two ends of the rack piston and are in sealing connection with the cylinder body through the sealing rings.
3. The rack and pinion structural swing hydraulic cylinder according to claim 1, wherein: and a gap is formed in the back of the rack and is used for fully lubricating the rack and the cylinder body.
4. The rack and pinion structural swing hydraulic cylinder according to claim 1, wherein: the clearance buffering throttling structure is composed of an inner hole formed in the end face of the rack piston and a cylindrical table arranged on the inner end face of the end cover, the inner hole of the end face of the rack piston is matched with the cylindrical table of the end cover, and a clearance is formed between the inner hole and the cylindrical table and used for buffering throttling.
5. The rack and pinion structural swing hydraulic cylinder according to claim 1, wherein: a safety positioning mechanism is further arranged between the cylinder body and the rack piston and consists of a pin shaft, a valve seat and a spring, the valve seat is fixedly connected to the outer side of the cylinder body, the pin shaft is movably connected in the valve seat, a circumferential boss is arranged in the middle of the pin shaft, the upper end of the circumferential boss is communicated with a hydraulic pressure inlet and outlet channel in the cylinder body, and the lower end of the circumferential boss is connected with the spring; and a groove matched with the pin shaft is formed in the periphery of the rack piston.
6. The swing hydraulic cylinder of rack and pinion structure according to claim 5, wherein: and a radial sealing ring is arranged between the pin shaft and the valve seat.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922220325.1U CN211474570U (en) | 2019-12-09 | 2019-12-09 | Swing hydraulic cylinder with gear rack structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922220325.1U CN211474570U (en) | 2019-12-09 | 2019-12-09 | Swing hydraulic cylinder with gear rack structure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211474570U true CN211474570U (en) | 2020-09-11 |
Family
ID=72363204
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201922220325.1U Active CN211474570U (en) | 2019-12-09 | 2019-12-09 | Swing hydraulic cylinder with gear rack structure |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN211474570U (en) |
-
2019
- 2019-12-09 CN CN201922220325.1U patent/CN211474570U/en active Active
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