CN218509857U - Equal-thrust constant-speed double-acting two-stage hydraulic cylinder - Google Patents
Equal-thrust constant-speed double-acting two-stage hydraulic cylinder Download PDFInfo
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- CN218509857U CN218509857U CN202222928745.7U CN202222928745U CN218509857U CN 218509857 U CN218509857 U CN 218509857U CN 202222928745 U CN202222928745 U CN 202222928745U CN 218509857 U CN218509857 U CN 218509857U
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Abstract
The utility model relates to an equal thrust constant speed double-acting two-stage hydraulic cylinder, which comprises a cylinder barrel; the oil inlet cavity is provided with an oil pressure area S1; the secondary piston rod assembly is provided with an oil pressure area S2 in the first secondary oil inlet cavity, and the secondary piston rod assembly is provided with an oil pressure area S3 in the second secondary oil inlet cavity; s1= S2+ S3. The pressure bearing areas of the primary piston rod assembly and the secondary piston rod assembly are the same, so that the speed of the primary piston cylinder is equal to that of the secondary piston cylinder when the primary piston cylinder and the secondary piston cylinder extend out, and the sudden change of the speed of the oil cylinder when the piston rod extends out to change the stage is avoided, so that the impact on the load is avoided, and the safety is high.
Description
Technical Field
The utility model relates to an equal thrust constant speed double-acting two-stage pneumatic cylinder.
Background
The two-stage hydraulic cylinder can be formed larger in a limited space, but the existing two-stage hydraulic cylinder also has the defects that in oil pressure, the thrust F of a piston rod, the oil pressure P, the area S of the piston rod, and the thrust F = the oil pressure P multiplied by the area S of the piston rod.
Because the two-stage piston rod extends out of the one-stage piston rod in the past, the area S2 of the piston rod is smaller than the area S1 of the piston rod, under the condition that the oil pressure P1= the oil pressure P1, the thrust F2 of the two-stage piston rod is finally smaller than the thrust F1 of the one-stage piston rod, if the thrust F1 and the thrust F2 are greatly different, when the two-stage cylinder works under the actual heavy-load working condition, the sudden change of the speed of the piston rod can be caused, and the heavy impact can be caused to the load, so that the safety is ensured.
Therefore, how to realize constant-speed equal thrust of the two-stage hydraulic cylinder is a problem which needs to be solved all the time in the industry, only the two-stage cylinder can work under a large-load working condition by realizing constant-speed equal thrust, and the prior patent application also tries to solve the problem, namely the application number: 201910134254.5, patent name: in the patent, a stroke section of a piston rod is controlled by stroke of a middle cylinder barrel, so that a piston rod is reliably pushed out by a corresponding stroke in the operation process of the middle cylinder. The cylinder needs to retract by external force. The technical scheme of above-mentioned patent does not solve the problem of thrust such as two-stage jar constant speed in fact yet fundamentally, only shortens well cylinder stroke, and the problem solution exists, and this patent application is exactly to solve the problem of thrust such as two-stage jar constant speed.
SUMMERY OF THE UTILITY MODEL
The to-be-solved technical problem of the utility model is: the defects of the prior art are overcome, the double-acting two-stage hydraulic cylinder with equal thrust and constant speed is provided, and the problem that the constant thrust and the equal speed cannot be realized by the conventional two-stage cylinder is solved.
The utility model provides a technical scheme that its technical problem adopted is:
an equal-thrust constant-speed double-acting two-stage hydraulic cylinder is provided, which comprises
A cylinder barrel;
one end of the first-stage piston rod assembly extends into the cylinder barrel and is in sliding fit with the cylinder barrel, the other end of the first-stage piston rod assembly extends out of the cylinder barrel, a first-stage oil inlet cavity and a first-stage oil return cavity are formed between the first-stage piston rod assembly and the cylinder barrel, and the first-stage piston rod assembly is provided with an oil pressure area S1 in the first-stage oil inlet cavity;
one end of the second-stage piston rod assembly extends into the first-stage piston rod assembly and is in sliding fit with the first-stage piston rod assembly, the other end of the second-stage piston rod assembly extends out of the first-stage piston rod assembly, a first second oil inlet cavity, a second oil inlet cavity and a second oil return cavity are formed between the second-stage piston rod assembly and the first-stage piston rod assembly, the second-stage piston rod assembly is provided with an oil pressure area S2 in the first second oil inlet cavity, and the second-stage piston rod assembly is provided with an oil pressure area S3 in the second oil inlet cavity;
the first-stage oil inlet cavity is communicated with the first-stage oil inlet cavity and the second-stage oil inlet cavity, and the first-stage oil return cavity is communicated with the second-stage oil return cavity;
s1= S2+ S3.
Further, the primary piston rod assembly comprises
The first-stage piston cylinder is movably arranged in the cylinder barrel, the inner end of the first-stage piston cylinder is provided with a first piston, and the outer end of the first-stage piston cylinder extends out of the cylinder barrel;
a first-stage oil inlet cavity is formed between the first piston and the bottom of the cylinder barrel, and a first-stage oil return cavity is formed between the outer wall of the first-stage piston barrel and the inner wall of the cylinder barrel;
one end of the inner piston rod is fixedly connected with the first piston, the other end of the inner piston rod is connected with the second piston, and the second piston is in sliding fit with the secondary piston rod assembly;
the secondary piston rod assembly is movably arranged in the primary piston cylinder, the inner piston rod extends into the secondary piston rod assembly, and the second piston is in sliding fit with the secondary piston rod assembly;
a first secondary oil inlet cavity is formed between the second-stage piston rod assembly and the first piston, and a second secondary oil return cavity and a second secondary oil inlet cavity are formed between the second piston and the second-stage piston rod assembly;
a first oil hole and a second oil hole are formed in the first piston, and a third oil hole and a fourth oil hole are formed in the inner piston rod;
the first oil hole is communicated with the first-stage oil inlet cavity and the first second-stage oil inlet cavity, and the third oil hole is communicated with the first-stage oil inlet cavity and the second-stage oil inlet cavity; one end of the second oil hole is communicated with the primary oil return cavity, the other end of the second oil hole is communicated with the fourth oil hole, one end of the fourth oil hole is communicated with the second oil hole, and the other end of the fourth oil hole is communicated with the secondary oil return cavity;
and the S1 comprises the area of the first piston, the end area of the inner piston rod and the end area of the primary piston cylinder.
Further, the secondary piston rod assembly comprises
The secondary piston cylinder is movably arranged in the primary piston cylinder, an inner guide sleeve is fixedly arranged at the inner end of the secondary piston cylinder, and the outer end of the secondary piston cylinder extends out of the primary piston cylinder and is connected with the top seat;
the inner piston rod penetrates through the inner guide sleeve, and the second piston moves in the secondary piston cylinder;
a first secondary oil inlet cavity is formed between the inner guide sleeve and the first piston, a second secondary oil inlet cavity is formed between the second piston and the top seat, and a second secondary oil return cavity is formed between the inner guide sleeve and the second piston;
s2 is the end area of the inner guide sleeve, and S3 is the end area of the top seat.
Furthermore, a first guide sleeve is arranged at the front end of the cylinder barrel, and the primary piston barrel penetrates through the first guide sleeve;
the front end of the primary piston cylinder is provided with a second guide sleeve, and the secondary piston cylinder penetrates through the second guide sleeve.
Further, the cylinder includes the barrel and sets up the base at the barrel.
The beneficial effects of the utility model are that:
the utility model discloses a two-stage pneumatic cylinder of effect of constant speed of thrust, it is the same with the pressurized area of one-level piston rod subassembly and second grade piston rod subassembly, make one-level piston cylinder and second grade piston cylinder speed equal when stretching out, avoid the piston rod when stretching out and trade the grade, hydro-cylinder speed sudden change to avoid producing the impact to the load, it is unsafe.
Drawings
The present invention will be further explained with reference to the accompanying drawings.
FIG. 1 is a schematic view of the constant-thrust, constant-velocity, double-acting, two-stage hydraulic cylinder of the present invention as it retracts;
FIG. 2 is a schematic view of the constant-thrust constant-speed double-acting two-stage hydraulic cylinder of the present invention when it is extended;
FIG. 3 is a schematic view of a first piston;
FIG. 4 is a schematic view of the oil pressure area S1 of the primary piston rod assembly;
FIG. 5 is a schematic view of the oil pressure area S2 of the two-stage piston rod assembly;
FIG. 6 is a schematic illustration of the oil pressure area S3 of the two-stage piston rod assembly;
the device comprises a cylinder barrel 1, a cylinder barrel 11, a base 12 and a first guide sleeve;
2. the device comprises a primary piston rod assembly 21, a primary piston cylinder 22, a first piston 23, an inner piston rod 24, a second piston 25 and a second guide sleeve;
3. a secondary piston rod assembly 31, a secondary piston cylinder 32, an inner guide sleeve 33 and a top seat;
41. a primary oil inlet cavity, 42 and a primary oil return cavity;
51. the first secondary oil inlet cavity 52, the second secondary oil inlet cavity 53 and the second secondary oil return cavity;
61. first oilhole, 62, second oilhole, 63, third oilhole, 64, fourth oilhole.
Detailed Description
The invention will now be further described with reference to the accompanying drawings. The drawings are simplified schematic diagrams only illustrating the basic structure of the present invention in a schematic manner, and thus show only the components related to the present invention.
As shown in figures 1 to 6, the equal-thrust constant-speed double-acting two-stage hydraulic cylinder comprises
A cylinder barrel 1;
one end of the primary piston rod assembly 2 extends into the cylinder barrel 1 and is in sliding fit with the cylinder barrel 1, the other end of the primary piston rod assembly 2 extends out of the cylinder barrel 1, a primary oil inlet cavity 41 and a primary oil return cavity 42 are formed between the primary piston rod assembly 2 and the cylinder barrel 1, and the primary piston rod assembly 2 is provided with an oil pressure area S1 in the primary oil inlet cavity 41;
one end of the second-stage piston rod assembly 3 extends into the first-stage piston rod assembly 2 and is in sliding fit with the first-stage piston rod assembly 2, the other end of the second-stage piston rod assembly 3 extends out of the first-stage piston rod assembly 2, a first second oil inlet cavity 51, a second oil inlet cavity 52 and a second oil return cavity 53 are formed between the second-stage piston rod assembly 3 and the first-stage piston rod assembly 2, the second-stage piston rod assembly 3 is provided with an oil pressure area S2 in the first second oil inlet cavity 51, and the second-stage piston rod assembly 3 is provided with an oil pressure area S3 in the second oil inlet cavity 52;
the primary oil inlet cavity 41 is communicated with the secondary oil inlet cavity I51 and the secondary oil inlet cavity II 52, and the primary oil return cavity 42 is communicated with the secondary oil return cavity 53;
s1= S2+ S3.
Specifically, as an alternative implementation manner in this embodiment, as shown in fig. 1 to 6, the primary piston rod assembly 2 includes
A primary piston cylinder 21 which is movably arranged in the cylinder barrel 1, the inner end of which is provided with a first piston 22, and the outer end of which extends out of the cylinder barrel 1;
a primary oil inlet cavity 41 is formed between the first piston 22 and the bottom of the cylinder barrel 1, and a primary oil return cavity 42 is formed between the outer wall of the primary piston barrel 21 and the inner wall of the cylinder barrel 1;
one end of the inner piston rod 23 is fixedly connected with the first piston 22, the other end of the inner piston rod is connected with the second piston 24, and the second piston 24 is in sliding fit with the secondary piston rod assembly 3;
the secondary piston rod assembly 3 is movably arranged in the primary piston cylinder 21, the inner piston rod 23 extends into the secondary piston rod assembly 3, and the second piston 24 is in sliding fit with the secondary piston rod assembly 3;
a first secondary oil inlet cavity 51 is formed between the second-stage piston rod assembly 3 and the first piston 22, and a second secondary oil return cavity 53 and a second secondary oil inlet cavity 52 are formed between the second piston 24 and the second-stage piston rod assembly 3;
a first oil hole 61 and a second oil hole 62 are formed in the first piston 22, and a third oil hole 63 and a fourth oil hole 64 are formed in the inner piston rod 23;
the first oil hole 61 is communicated with the first-stage oil inlet cavity 41 and the first second-stage oil inlet cavity 51, and the third oil hole 63 is communicated with the first-stage oil inlet cavity 41 and the second-stage oil inlet cavity 52; one end of the second oil hole 62 is communicated with the primary oil return cavity 42, the other end of the second oil hole 62 is communicated with the fourth oil hole 64, one end of the fourth oil hole 64 is communicated with the second oil hole 62, and the other end of the fourth oil hole is communicated with the secondary oil return cavity 53;
as shown in fig. 4, since the first piston 22 is embedded in the stage piston cylinder and the inner piston rod 23 protrudes from the first piston 22, the S1 includes an area of the first piston 22 + an end area of the inner piston rod 23 + an end area of the stage piston cylinder 21.
Specifically, as an alternative implementation manner in this embodiment, as shown in fig. 1 to 6, the two-stage piston rod assembly 3 includes
The secondary piston cylinder 31 is movably arranged in the primary piston cylinder 21, an inner guide sleeve 32 is fixedly arranged at the inner end of the secondary piston cylinder, and the outer end of the secondary piston cylinder extends out of the primary piston cylinder 21 and is connected with a top seat 33;
the inner piston rod 23 passes through the inner guide sleeve 32, and the second piston 24 moves in the secondary piston cylinder 31;
a first secondary oil inlet cavity 51 is formed between the inner guide sleeve 32 and the first piston 22, a second secondary oil inlet cavity 52 is formed between the second piston 24 and the top seat 33, and a second secondary oil return cavity 53 is formed between the inner guide sleeve 32 and the second piston 24;
s2 is the end area of the inner guide sleeve 32, and S3 is the end area of the top seat 33.
Specifically, as an alternative embodiment in this embodiment, as shown in fig. 1 and fig. 2, a first guide sleeve 12 is disposed at the front end of the cylinder barrel 1, and the primary piston barrel 21 passes through the first guide sleeve 12;
the front end of the primary piston cylinder 21 is provided with a second guide sleeve 25, and the secondary piston cylinder 31 passes through the second guide sleeve 25.
Specifically, as an alternative embodiment in this embodiment, as shown in fig. 1 and fig. 2, the cylinder 1 includes a cylinder body and a base 11 disposed on the cylinder body.
The utility model discloses a two-stage pneumatic cylinder work flow:
the first-stage oil inlet cavity 41 is connected with an oil inlet pipe, the first-stage oil return cavity 42 is connected with an oil return pipe, the oil inlet pipe inputs hydraulic oil into the first-stage oil inlet cavity 41, the first oil hole 61 is communicated with the first-stage oil inlet cavity 41 and the first second oil inlet cavity 51, and the third oil hole 63 is communicated with the first-stage oil inlet cavity 41 and the second oil inlet cavity 52, so that oil pressures of the three cavities, namely the first-stage oil inlet cavity 41, the first second oil inlet cavity 51 and the second oil inlet cavity 52 are equal, namely pressure P is equal, S1 of the first-stage piston rod assembly 2 bears the oil pressure in the first-stage oil inlet cavity 41, the second-stage piston rod assembly 3 is provided with two oil pressure bearing surfaces, namely S2 and S3, and by controlling the area size, S1= S2+ S3, because the thrust F1= P1 xS 1 of the first-stage piston rod assembly 2 and the thrust F2= P2 x (S2 + S3), so the thrust and the speed of the first-stage piston rod assembly 2 are the same.
With the extension of the first-stage piston cylinder 21 and the second-stage piston cylinder 31, the hydraulic oil in the second-stage oil return cavity 53 sequentially passes through the fourth oil hole 64 and the second oil hole 62 to enter the first-stage oil return cavity 42, and finally is output from the oil return pipe, so that the two-stage cylinder realizes the extension operation.
In light of the foregoing, it will be apparent to those skilled in the art from this disclosure that various changes and modifications can be made without departing from the spirit and scope of the invention. The technical scope of the present invention is not limited to the content of the specification, and must be determined according to the scope of the claims.
Claims (5)
1. An equal-thrust constant-speed double-acting two-stage hydraulic cylinder is characterized by comprising
A cylinder barrel;
one end of the first-stage piston rod assembly extends into the cylinder barrel and is in sliding fit with the cylinder barrel, the other end of the first-stage piston rod assembly extends out of the cylinder barrel, a first-stage oil inlet cavity and a first-stage oil return cavity are formed between the first-stage piston rod assembly and the cylinder barrel, and the first-stage piston rod assembly is provided with an oil pressure area S1 in the first-stage oil inlet cavity;
one end of the second-stage piston rod assembly extends into the first-stage piston rod assembly and is in sliding fit with the first-stage piston rod assembly, the other end of the second-stage piston rod assembly extends out of the first-stage piston rod assembly, a first second oil inlet cavity, a second oil inlet cavity and a second oil return cavity are formed between the second-stage piston rod assembly and the first-stage piston rod assembly, the second-stage piston rod assembly is provided with an oil pressure area S2 in the first second oil inlet cavity, and the second-stage piston rod assembly is provided with an oil pressure area S3 in the second oil inlet cavity;
the first-stage oil inlet cavity is communicated with the first-stage oil inlet cavity and the second-stage oil inlet cavity, and the first-stage oil return cavity is communicated with the second-stage oil return cavity;
s1= S2+ S3.
2. An equal-thrust constant-speed double-acting two-stage hydraulic cylinder according to claim 1,
the primary piston rod assembly comprises
The first-stage piston cylinder is movably arranged in the cylinder barrel, the inner end of the first-stage piston cylinder is provided with a first piston, and the outer end of the first-stage piston cylinder extends out of the cylinder barrel;
a first-stage oil inlet cavity is formed between the first piston and the bottom of the cylinder barrel, and a first-stage oil return cavity is formed between the outer wall of the first-stage piston barrel and the inner wall of the cylinder barrel;
one end of the inner piston rod is fixedly connected with the first piston, and the other end of the inner piston rod is connected with the second piston;
the secondary piston rod assembly is movably arranged in the primary piston cylinder, the inner piston rod extends into the secondary piston rod assembly, and the second piston is in sliding fit with the secondary piston rod assembly;
a first secondary oil inlet cavity is formed between the second-stage piston rod assembly and the first piston, and a second secondary oil return cavity and a second secondary oil inlet cavity are formed between the second piston and the second-stage piston rod assembly;
a first oil hole and a second oil hole are formed in the first piston, and a third oil hole and a fourth oil hole are formed in the inner piston rod;
the first oil hole is communicated with the first-stage oil inlet cavity and the first second-stage oil inlet cavity, and the third oil hole is communicated with the first-stage oil inlet cavity and the second-stage oil inlet cavity; one end of the second oil hole is communicated with the first-stage oil return cavity, the other end of the second oil hole is communicated with a fourth oil hole, one end of the fourth oil hole is communicated with the second oil hole, and the other end of the fourth oil hole is communicated with the second-stage oil return cavity;
and the S1 comprises the area of the first piston, the end area of the inner piston rod and the end area of the primary piston cylinder.
3. An equal-thrust constant-speed double-acting two-stage hydraulic cylinder according to claim 2,
the secondary piston rod assembly comprises
The secondary piston cylinder is movably arranged in the primary piston cylinder, an inner guide sleeve is fixedly arranged at the inner end of the secondary piston cylinder, and the outer end of the secondary piston cylinder extends out of the primary piston cylinder and is connected with the top seat;
the inner piston rod penetrates through the inner guide sleeve, and the second piston moves in the secondary piston cylinder;
a first secondary oil inlet cavity is formed between the inner guide sleeve and the first piston, a second secondary oil inlet cavity is formed between the second piston and the top seat, and a second secondary oil return cavity is formed between the inner guide sleeve and the second piston;
s2 is the end area of the inner guide sleeve, and S3 is the end area of the top seat.
4. An equal-thrust constant-speed double-acting two-stage hydraulic cylinder according to claim 3,
the front end of the cylinder barrel is provided with a first guide sleeve, and the primary piston barrel penetrates through the first guide sleeve;
the front end of the primary piston cylinder is provided with a second guide sleeve, and the secondary piston cylinder penetrates through the second guide sleeve.
5. An equal-thrust constant-speed double-acting two-stage hydraulic cylinder according to claim 1,
the cylinder barrel comprises a barrel body and a base arranged on the barrel body.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222928745.7U CN218509857U (en) | 2022-11-03 | 2022-11-03 | Equal-thrust constant-speed double-acting two-stage hydraulic cylinder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222928745.7U CN218509857U (en) | 2022-11-03 | 2022-11-03 | Equal-thrust constant-speed double-acting two-stage hydraulic cylinder |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN218509857U true CN218509857U (en) | 2023-02-21 |
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ID=85220268
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202222928745.7U Active CN218509857U (en) | 2022-11-03 | 2022-11-03 | Equal-thrust constant-speed double-acting two-stage hydraulic cylinder |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN218509857U (en) |
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2022
- 2022-11-03 CN CN202222928745.7U patent/CN218509857U/en active Active
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