CN218564069U - Self-unloading equal-thrust secondary hydraulic cylinder - Google Patents
Self-unloading equal-thrust secondary hydraulic cylinder Download PDFInfo
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- CN218564069U CN218564069U CN202221878992.4U CN202221878992U CN218564069U CN 218564069 U CN218564069 U CN 218564069U CN 202221878992 U CN202221878992 U CN 202221878992U CN 218564069 U CN218564069 U CN 218564069U
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Abstract
The utility model discloses a self-unloading equal-thrust secondary hydraulic cylinder, which comprises an outer cylinder barrel, a cylinder bottom, a rodless cavity oil port, a rod cavity oil port, a primary piston cylinder barrel, a primary piston, a secondary piston cylinder barrel and a secondary piston, wherein the front end of the secondary piston cylinder barrel is fixedly connected with a rod head; an inner cylinder cover is fixedly arranged in the rear end of the primary piston cylinder barrel, a secondary extension cavity oil way communicated with the front end face and the rear end face of the primary piston cylinder barrel is arranged in the inner cylinder cover, an inner guide sleeve is fixedly connected in the rear end of the secondary piston cylinder barrel, a central piston pipe penetrates through the inner cylinder cover and the inner guide sleeve, the central piston pipe is fixedly connected with the inner cylinder cover, an inner piston arranged in the secondary piston cylinder barrel in a sliding mode is fixedly connected at the front end of the central piston pipe, and a central pipe is fixedly arranged in the central piston pipe; an unloading valve is arranged in the inner piston; the utility model discloses can avoid the interior piston in its forefront can bear the high pressure at the stroke end, prevent that the piston is not hard up, became invalid, and do not influence other sizes of hydro-cylinder to thrust such as realization has ensured hydro-cylinder security and reliability.
Description
Technical Field
The utility model relates to a second grade pneumatic cylinder, especially a thrust second grade pneumatic cylinder such as self-unloading.
Background
The piston of the hydraulic oil cylinder is usually connected with a piston rod, and the currently used secondary equal-thrust oil cylinders are not designed with a limiting unloading device structure, and the defects of the two-stage equal-thrust oil cylinder are that the secondary piston can bear high pressure at the tail end of a stroke in the test process and no-load, so that the connecting threads of the secondary piston and the piston rod are easy to loosen, the piston anti-loosening structure fails and the like, and a series of problems are caused on the whole oil cylinder, and the normal operation of the whole system is influenced.
Disclosure of Invention
The utility model aims at the above-mentioned not enough of prior art, provide a thrust secondary hydraulic cylinder such as self-unloading, can avoid the interior piston in its the forefront can bear the high pressure at the stroke end, prevent that the piston is not hard up, became invalid, and do not influence other sizes of hydro-cylinder to thrust such as realization has ensured hydro-cylinder security and reliability.
In order to achieve the purpose, the self-unloading equal-thrust secondary hydraulic cylinder comprises an outer cylinder barrel, a cylinder bottom, a rodless cavity oil port, a rod cavity oil port, a primary piston cylinder barrel, a primary piston, a secondary piston cylinder barrel and a secondary piston, wherein a rod head is fixedly connected to the front end of the secondary piston cylinder barrel; the device is characterized in that an inner cylinder cover is fixedly arranged in the rear end of a primary piston cylinder barrel, a secondary piston cylinder barrel is positioned in front of the inner cylinder cover, a secondary cavity extending oil circuit communicated with the front end face and the rear end face of the inner cylinder cover is arranged in the inner cylinder cover, an inner guide sleeve is fixedly connected in the rear end of the secondary piston cylinder barrel, a central piston pipe penetrates through the inner cylinder cover and the inner guide sleeve, the central piston pipe is fixedly connected with the inner cylinder cover, an inner piston slidably arranged in the secondary piston cylinder barrel is fixedly connected at the front end of the central piston pipe, a central pipe is fixedly arranged in the central piston pipe, and the central pipe is communicated with a rodless cavity of the primary piston cylinder barrel and an inner cavity of the secondary piston cylinder barrel in front of the inner piston; a secondary cavity oil way is connected with the first-stage piston cylinder barrel, the inner cylinder cover and the central piston pipe, the secondary cavity oil way is communicated with the excircle of the first-stage piston cylinder barrel and the inner hole of the central piston pipe, and the central piston pipe behind the inner piston is provided with an oil hole communicated with the excircle and the inner hole of the central piston pipe; the inner piston is internally provided with an unloading valve, the unloading valve comprises a step-shaped unloading hole which is communicated with the front end surface and the rear end surface of the inner piston, a valve seat fixedly connected in the rear side of the unloading hole, a rear steel ball and a front steel ball which are sequentially arranged in the unloading hole in front of the valve seat, a compression spring is arranged between the rear steel ball and the front steel ball, a step hole is arranged in the valve seat, a mandril is slidably arranged in the step hole, and the rear end of the mandril is positioned behind the rear end surface of the inner piston;
the utility model discloses the during operation: when the oil is fed into the oil port of the rodless cavity, the first-stage piston cylinder barrel extends out firstly, after the stroke is finished, the second-stage piston cylinder barrel is pushed to extend out by oil through the oil passage of the second-stage cavity, when the second-stage piston cylinder barrel reaches the tail end of the stroke, the inner guide sleeve connected with the second-stage piston cylinder barrel pushes the ejector rod and the rear steel ball forwards, meanwhile, the front steel ball moves backwards under the action of hydraulic oil in the cavity behind the rod head, the unloading valve is opened, the two ends of the inner piston are communicated and unloaded, the condition that the foremost inner piston bears high pressure at the tail end of the stroke and is prevented from loosening and losing efficacy is avoided, and the unloading valve is arranged in the oil cylinder, so that other sizes of the oil cylinder are not influenced, the assembly and the disassembly are convenient, and the safety and the reliability of the oil cylinder are guaranteed;
as a further improvement of the utility model, a sealing ring is arranged between the valve seat and the inner piston; abnormal leakage can be prevented;
as a further improvement of the utility model, a large-diameter hole of the stepped hole of the valve seat is in small clearance fit with a large-diameter section of the ejector rod, and the large-diameter section is provided with an axial oil passing groove; the movement of the ejector rod can be accurately guided and smoothly passed through the oil;
as a further improvement of the utility model, the cross-sectional area of the inner cavity of the outer cylinder barrel behind the primary piston is equal to the sum of the cross-sectional area of the annular cavity between the central piston tube behind the secondary piston and the cylinder barrel of the secondary piston and the cross-sectional area of the cavity behind the rod head; equal thrust of the two-stage piston cylinder barrel can be realized;
to sum up, the utility model discloses can avoid the interior piston in its forefront can bear the high pressure at the stroke end, prevent that the piston is not hard up, became invalid, and do not influence other sizes of hydro-cylinder to thrust such as realization has ensured hydro-cylinder security and reliability.
Drawings
Fig. 1 is a front view of an embodiment of the present invention.
Fig. 2 is an enlarged view of fig. 1 at K.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
As shown in fig. 1 and 2, the self-unloading equal-thrust secondary hydraulic cylinder of the embodiment includes an outer cylinder barrel 1, a cylinder bottom 2, a rodless cavity oil port 3, a rod cavity oil port 4, a primary piston cylinder barrel 5, a primary piston 6, a secondary piston cylinder barrel 7 and a secondary piston 8, wherein a rod head 9 is welded and fixedly connected to the front end of the secondary piston cylinder barrel 7; an inner cylinder cover 11 is fixedly arranged in the rear end of the primary piston cylinder 5 through a positioning screw ring 10, the secondary piston cylinder 7 is positioned in front of the inner cylinder cover 11, a secondary cavity-extending oil way 12 communicated with the front end surface and the rear end surface of the inner cylinder cover 11 is arranged in the inner cylinder cover 11, an inner guide sleeve 13 is fixedly connected in the rear end of the secondary piston cylinder 7 through threads and set screws, a central piston pipe 14 penetrates through the inner cylinder cover 11 and the inner guide sleeve 13, the central piston pipe 14 is fixedly connected with the inner cylinder cover 11, an inner piston 15 slidably arranged in the secondary piston cylinder 7 is fixedly connected at the front end of the central piston pipe 14, a central pipe 16 is fixedly arranged in the central piston pipe 14, and the central pipe 16 is communicated with a rodless cavity of the primary piston cylinder 5 and an inner cavity of the secondary piston cylinder 7 in front of the inner piston 15; a secondary cavity contracting oil way 17 connected with each other is arranged in the primary piston cylinder 5, the inner cylinder cover 11 and the central piston pipe 14, the secondary cavity contracting oil way 17 is communicated with the excircle of the primary piston cylinder 5 and the inner hole of the central piston pipe 14, and the central piston pipe 14 behind the inner piston 15 is provided with an oil passing hole 18 communicated with the excircle and the inner hole thereof; an unloading valve 19 is arranged in the inner piston 15, the unloading valve 19 comprises a step-shaped unloading hole 21 communicated with the front end face and the rear end face of the inner piston 14, a valve seat 22 fixedly connected to the rear side of the unloading hole 21 through threads, and a rear steel ball 23 and a front steel ball 24 which are sequentially arranged in the unloading hole 21 in front of the valve seat 22, a compression spring 25 is arranged between the rear steel ball 23 and the front steel ball 24, a step hole is arranged in the valve seat 22, a push rod 26 is slidably arranged in the step hole, a large-diameter hole of the step hole of the valve seat 22 is in small-clearance fit with a large-diameter section of the push rod 26, and the large-diameter section is provided with an axial oil passing groove 27; the rear end of the ejector rod 26 is positioned behind the rear end surface of the inner piston 15; a sealing ring 28 is arranged between the valve seat 22 and the inner piston 15; the cross sectional area of the inner cavity of the outer cylinder barrel 1 behind the first-stage piston 6 is equal to the sum of the cross sectional area of the annular cavity between the central piston tube 14 behind the second-stage piston 8 and the second-stage piston cylinder barrel 7 and the cross sectional area of the cavity 29 behind the rod head 9;
the utility model discloses the during operation: when the rodless cavity oil port 3 is filled with oil, the first-stage piston cylinder 5 extends out firstly, after the stroke is finished, hydraulic oil is introduced through the second-stage cavity extending oil path 12 and the central tube 16 to act on the second-stage piston 8, the inner guide sleeve 13 and the rod head 9 respectively to push the second-stage piston cylinder 7 to extend out, and as the cross sectional area of the inner cavity of the outer cylinder 1 behind the first-stage piston 6 is equal to the sum of the cross sectional area of the annular cavity between the central piston tube 14 behind the second-stage piston cylinder 8 and the second-stage piston cylinder 7 and the cross sectional area of the cavity 29 behind the rod head 9, equal-thrust extension of the two-stage piston cylinder can be realized; when the secondary piston cylinder 7 moves to the tail end of the stroke, the inner guide sleeve 13 connected with the secondary piston cylinder pushes the ejector rod 26 and the rear steel ball 23 forwards, meanwhile, the front steel ball 24 moves backwards under the action of hydraulic oil in a cavity behind the rod head 9, the unloading valve is opened, the two ends of the inner piston 15 are communicated and unloaded, the condition that the foremost inner piston 15 bears the high pressure on the front side at the tail end of the stroke can be avoided, the piston is prevented from loosening and losing efficacy, and the unloading valve is arranged in the oil cylinder, so other sizes of the oil cylinder are not influenced, the assembly and disassembly are convenient, and the safety and reliability of the oil cylinder are guaranteed; under other working conditions, the rear steel ball 23, the compression spring 25 and the front steel ball 24 can prevent hydraulic oil in cavities at two sides of the inner piston 15 from opening the unloading valve; the seal ring 28 prevents abnormal leakage; the large diameter hole of the stepped hole is in small clearance fit with the large diameter section of the push rod 26, so that the movement of the push rod can be accurately guided, and oil can be smoothly passed through the oil passing groove 27.
Claims (4)
1. A self-unloading equal-thrust secondary hydraulic cylinder comprises an outer cylinder barrel, a cylinder bottom, a rodless cavity oil port, a rod cavity oil port, a primary piston cylinder barrel, a primary piston, a secondary piston cylinder barrel and a secondary piston, wherein a rod head is fixedly connected to the front end of the secondary piston cylinder barrel; the device is characterized in that an inner cylinder cover is fixedly arranged in the rear end of a primary piston cylinder barrel, a secondary piston cylinder barrel is positioned in front of the inner cylinder cover, a secondary cavity extending oil circuit communicated with the front end face and the rear end face of the inner cylinder cover is arranged in the inner cylinder cover, an inner guide sleeve is fixedly connected in the rear end of the secondary piston cylinder barrel, a central piston pipe penetrates through the inner cylinder cover and the inner guide sleeve, the central piston pipe is fixedly connected with the inner cylinder cover, an inner piston slidably arranged in the secondary piston cylinder barrel is fixedly connected at the front end of the central piston pipe, a central pipe is fixedly arranged in the central piston pipe, and the central pipe is communicated with a rodless cavity of the primary piston cylinder barrel and an inner cavity of the secondary piston cylinder barrel in front of the inner piston; a secondary cavity oil way is connected with the first-stage piston cylinder barrel, the inner cylinder cover and the central piston pipe, the secondary cavity oil way is communicated with the excircle of the first-stage piston cylinder barrel and the inner hole of the central piston pipe, and the central piston pipe behind the inner piston is provided with an oil hole communicated with the excircle and the inner hole of the central piston pipe; the inner piston is provided with an unloading valve, the unloading valve comprises a step-shaped unloading hole in the inner piston, a valve seat, a rear steel ball and a front steel ball, the step-shaped unloading hole is communicated with the front end face and the rear end face of the inner piston, the valve seat is fixedly connected in the rear side of the unloading hole, the rear steel ball and the front steel ball are sequentially arranged in the unloading hole in front of the valve seat, a compression spring is arranged between the rear steel ball and the front steel ball, a step hole is formed in the valve seat, a push rod is slidably arranged in the step hole, and the rear end of the push rod is located behind the rear end face of the inner piston.
2. The self-unloading equal-thrust secondary hydraulic cylinder as recited in claim 1, wherein: and a sealing ring is arranged between the valve seat and the inner piston.
3. The self-unloading equal-thrust secondary hydraulic cylinder as claimed in claim 1 or 2, wherein: the big diameter hole of the shoulder hole of the valve seat is in small clearance fit with the big diameter section of the ejector rod, and the big diameter section is provided with an axial oil passing groove.
4. The self-unloading equal-thrust secondary hydraulic cylinder as recited in claim 3, wherein: the cross sectional area of the inner cavity of the outer cylinder barrel behind the first-stage piston is equal to the sum of the cross sectional area of the annular cavity between the central piston pipe behind the second-stage piston and the cylinder barrel of the second-stage piston and the cross sectional area of the cavity behind the rod head.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221878992.4U CN218564069U (en) | 2022-07-21 | 2022-07-21 | Self-unloading equal-thrust secondary hydraulic cylinder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221878992.4U CN218564069U (en) | 2022-07-21 | 2022-07-21 | Self-unloading equal-thrust secondary hydraulic cylinder |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN218564069U true CN218564069U (en) | 2023-03-03 |
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ID=85307854
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202221878992.4U Active CN218564069U (en) | 2022-07-21 | 2022-07-21 | Self-unloading equal-thrust secondary hydraulic cylinder |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN218564069U (en) |
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2022
- 2022-07-21 CN CN202221878992.4U patent/CN218564069U/en active Active
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