CN215214190U - Stroke-controlled sequential telescopic hydraulic cylinder with buffer - Google Patents
Stroke-controlled sequential telescopic hydraulic cylinder with buffer Download PDFInfo
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- CN215214190U CN215214190U CN202121689006.6U CN202121689006U CN215214190U CN 215214190 U CN215214190 U CN 215214190U CN 202121689006 U CN202121689006 U CN 202121689006U CN 215214190 U CN215214190 U CN 215214190U
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Abstract
The utility model discloses a stroke control's of area buffering order pneumatic cylinder that stretches out and draws back belongs to pneumatic cylinder technical field. The lower end of the piston rod is provided with an oil through hole E1, and an oil through hole E1 is communicated with a piston rod cavity C1 and a rod cavity D1; a rod head one-way valve is arranged in the oil through hole E1; an oil through hole E2 is formed in the lower end of the piston rod and the piston, and an oil through hole E2 is communicated with a piston rod cavity C1 and the outer circumferential surface of the piston; the cylinder barrel is provided with a quincunx hole oil port F1 and an oil port F2 which are communicated with the oil port B of the joint seat; when the piston rod extends to the maximum position, the oil through port E2 is relatively communicated with the oil port F1 of the quincunx hole, and the oil through port E1 is relatively communicated with the oil port F2; the utility model discloses an oil return of one-level hydro-cylinder under the restriction, only first order pneumatic cylinder stretches out the back completely, and the hydro-cylinder piston rod is inside just to make another oil circuit open through the stroke, realizes just analogizing in proper order for one-level hydro-cylinder fuel feeding down, and multi-cylinder combination realizes that the order stretches out.
Description
Technical Field
The utility model relates to a pneumatic cylinder technical field specifically is a stroke control's of area buffering order pneumatic cylinder that stretches out and draws back.
Background
With the continuous development of the truck-mounted crane industry and the progress of technical reserve, the technology that the hydraulic cylinder drives the telescopic arm to realize the sequential telescopic of the main machine structure becomes a development trend. The extension and retraction of the boom of the straight boom type lorry-mounted crane mean that each section of the telescopic boom performs extension and retraction according to a certain sequence according to the extension and retraction mode of a hydraulic cylinder, and because the lifting capacity of the main engine boom is matched with the lifting capacity of the main engine, the extension structure is that the telescopic boom extends out in sequence according to the size of the cross section from large to small, and the retraction sequence is that the boom retracts in sequence from small to large. Because of the requirement of the relevant standard of straight boom type lorry-mounted crane overall dimension and the consideration of outward appearance, the main frame arm body cross-section is less, for satisfying the flexible demand of market lorry-mounted crane on-load, can stretch out and draw back under the heavier load operating mode and realize on-load flexible, flexible pneumatic cylinder arranges in flexible cantilever crane, the corresponding operation of the flexible arm of host computer hydraulic system control main frame through pneumatic cylinder and the inside oil circuit of pneumatic cylinder, there are two hydraulic fluid ports promptly at pneumatic cylinder piston rod earrings position, an oil inlet leads to rodless chamber, an oil return opening leads to there is the pole chamber. The hydraulic system oil passes through the earrings, the primary core tube, the hollow valve rod, the mechanical trigger nut and the cylinder bottom integrated valve control structure through the oil inlet to reach the rodless cavity, the rodless cavity is driven by hydraulic oil, and the piston rod is fixed and the cylinder barrel extends out due to the fact that the hydraulic cylinder is inverted.
Meanwhile, a multi-core tube telescopic boom hydraulic cylinder of a domestic straight boom lorry-mounted crane has no buffer structure or has an unobvious buffer effect, and the buffer structure is used as a key component of the hydraulic cylinder, so that the function of the buffer structure is directly related to the stability of the overall performance of the hydraulic cylinder. Along with the requirement of working condition operation of the lorry-mounted crane on the buffer performance of the hydraulic cylinder, particularly when the oil cylinder is in a fully-contracted state and the piston moves to the tail end of a stroke, mechanical collision is generated between the piston and the cylinder bottom, and great impact and noise are generated. Therefore, parts of the oil cylinder and the main machine are damaged, and the influence on corresponding elements of a hydraulic system is caused. In order to improve the reliability of the hydraulic cylinder of the lorry-mounted crane, prolong the service life and improve the working effect, the buffer structure with the multi-core tube telescopic oil cylinder is produced by combining the working condition and the working performance of the lorry-mounted crane. Therefore, there is a need in the art for a mechanism that can achieve sequential telescoping in a stable and reliable manner and has a buffering effect to increase the overall lifting capacity of the crane.
The prior art has the following defects:
1. in order to enable all telescopic oil cylinders of a host to naturally extend and retract according to a certain sequence, the function is realized by adding a sequence valve at the bottom of the oil cylinder or adding a sequence valve at the joint seat of a cylinder barrel in the prior art, the function is to realize the purpose of sequential telescopic of the hydraulic cylinders through different opening pressures of tail valves of all the oil cylinders, and the defects are mainly that after a multi-stage cylinder is combined, the opening pressure is increased step by step, the energy consumption is large, the difference between the opening pressure of the last stage and the rated pressure of a system is not large, and the normal work of the host is influenced;
2. the reciprocating motion of sealing member can pass through the hydraulic fluid port on the cylinder body for wearing and tearing reduce life.
Disclosure of Invention
The utility model aims at providing a stroke control's of area buffering order pneumatic cylinder that stretches out and draws back, the oil return through the restriction next-level hydro-cylinder realizes the order of combination jar and stretches out.
The utility model discloses a realize with following technical scheme: a sequence telescopic hydraulic cylinder with a buffer stroke control function is characterized in that the lower end of a cylinder barrel is connected with a cylinder bottom, and an oil port A communicated with a rodless cavity D2 is formed in the cylinder bottom; the upper end of the cylinder barrel is connected with a guide sleeve, the cylinder barrel is connected with a joint seat, and the joint seat is provided with an oil port B communicated with a rod cavity D1; the piston rod is matched with and penetrates through the guide sleeve, the lower end of the piston rod is provided with a piston, and the piston is matched with the cylinder barrel; the center of the piston rod is provided with a core rod, and the upper end of the piston is connected with an earring; a first working oil port A1 and a second working oil port B1 are formed in the lug ring, the first working oil port A1 is communicated with a core tube rod cavity C2, and the second working oil port B1 is communicated with a piston rod cavity C1;
the lower end of the piston rod is provided with an oil through hole E1, and an oil through hole E1 is communicated with a piston rod cavity C1 and a rod cavity D1; the rod head check valve is arranged in the oil through hole E1 and is communicated with the piston rod cavity C1 in a one-way mode from the rod cavity D1; an oil through hole E2 is formed in the lower end of the piston rod and the piston, an oil through hole E2 is communicated with a piston rod cavity C1 and the outer circumferential surface of the piston, and an oil through hole E2 is located on one side, close to the cylinder bottom, of the oil through hole E1; the cylinder barrel is provided with a quincunx hole oil port F1 and an oil port F2 which are communicated with the oil port B of the joint seat, and the quincunx hole oil port F1 is positioned on one side of the oil port F2 close to the cylinder bottom; when the piston rod extends to the maximum position, the oil through port E2 is relatively communicated with the oil port F1 of the quincunx hole, and the oil through port E1 is relatively communicated with the oil port F2;
it further comprises the following steps: one end of the piston close to the cylinder bottom is provided with a buffer column, and a buffer sleeve is sleeved on the buffer column; a counter bore matched with the buffer sleeve is formed in the cylinder bottom; and the axle center of the buffer column is provided with a through hole for communicating the rodless cavity D2 with the core tube rod cavity C2.
The lower part of the cylinder bottom counter bore is provided with an oil through hole G1 communicated to the upper surface of the cylinder bottom, a cylinder bottom one-way valve is installed in the oil through hole G1, and the cylinder bottom one-way valve is communicated to the upper surface of the cylinder bottom in a one-way mode from the cylinder bottom counter bore.
The lower end of the piston rod is sleeved with a spacer bush opposite to the oil through hole E1, and the spacer bush is provided with a through hole opposite to the oil through hole E1.
The quincunx oil port F1 includes a central through hole in the middle and 6 peripheral through holes evenly distributed around the central through hole.
The piston is connected with the piston rod through threads, and the piston is tightly fixed with the piston rod through two screws in the radial direction.
Compared with the prior art, the beneficial effects of the utility model are that: the principle is simple, the structure is reliable, the installation is convenient and flexible, and the maintenance cost is low; the sequential extension of the combined cylinders is realized by limiting the oil return of the next-stage oil cylinder, great convenience is provided for sale and maintenance, the problems of solving the friction problem and the processing problem of the telescopic boom due to the disassembly of the main engine boom every time are avoided, the production cost is reduced, and the production efficiency is improved; a plurality of uniformly distributed small holes are drilled on the cylinder body to replace the drilling of a large hole, so that the friction force of a sealing element passing through the oil port when the piston rod moves can be reduced while the overflowing is ensured, and the service life is prolonged; the cylinder bottom one-way valve and the buffer sleeve spacer bush are additionally arranged at the cylinder bottom in the direction from the cylinder bottom to the earring, and the piston rod is decelerated and braked by utilizing the throttling of the stroke, so that the vibration impact is reduced.
Drawings
FIG. 1 is a schematic structural view of the present invention;
fig. 2 is a schematic structural view of a quincunx orifice F1;
in the figure: 1. a cylinder bottom; 2. a buffer sleeve; 3. a piston; 4. a spacer sleeve; 5. a rod head check valve; 6. a piston rod; 7. a cylinder barrel; 8. a joint base; 9. an ear ring; 10. a guide sleeve; 11. a core bar; 12. a buffer column; 13. a cylinder bottom check valve.
Detailed Description
The following is a specific embodiment of the present invention, which will be further described with reference to the accompanying drawings.
Referring to fig. 1, a sequence telescopic hydraulic cylinder with a buffer stroke control function is provided, wherein the lower end of a cylinder barrel 7 is connected with a cylinder bottom 1, and the upper end of the cylinder barrel 7 is connected with a guide sleeve 10. The piston rod 6 is matched with and penetrates through the guide sleeve 10, the piston 3 is installed at the lower end of the piston rod 6, and the piston 3 is matched with the cylinder barrel 7. The cylinder bottom 1 is provided with an oil port A communicated with the rodless cavity D2. The joint seat 8 is connected to the cylinder tube 7, the joint seat 8 is provided with an oil port B, the cylinder tube 7 is provided with a quincunx hole oil port F1 and an oil port F2 which are communicated with the oil port B of the joint seat 8, and the quincunx hole oil port F1 is positioned on one side of the oil port F2 close to the cylinder bottom 1. The center of the piston rod 6 is provided with a core rod 11, and the upper end of the piston 3 is connected with an ear ring 9. The earring 9 is provided with a first working oil port A1 and a second working oil port B1. The first working oil port A1 is communicated with the core tube rod cavity C2, and the first working oil port A1 is connected with an oil inlet of the next-stage oil cylinder. The second working oil port B1 is communicated with the piston rod cavity C1, and the second working oil port B1 is connected with an oil return port of the next-stage oil cylinder.
The lower end of the piston rod 6 is provided with an oil through hole E1, and the oil through hole E1 is communicated with a piston rod cavity C1 and a rod cavity D1. The oil through hole E1 is provided with a rod head check valve 5, and the rod head check valve 5 is communicated with the piston rod cavity C1 in a one-way mode from the rod cavity D1. The lower end of the piston rod 6 is sleeved with a spacer 4 opposite to the oil through hole E1, the spacer 4 is tightly attached to one side of the piston 3, and the spacer 4 is provided with a through hole opposite to the oil through hole E1. An oil through port E2 is formed in the lower end of the piston rod 6 and the piston 3, the oil through port E2 is communicated with the piston rod cavity C1 and the outer circumferential surface of the piston 3, and the oil through port E2 is located on one side, close to the cylinder bottom 1, of the oil through port E1. When the piston rod 6 extends to the maximum position, the oil through port E2 is in relative communication with the quincunx port F1, and the oil through port E1 is opposite to the port F2. As shown in fig. 2, the quincunx oil port F1 includes a central through hole in the middle and 6 peripheral through holes evenly distributed around the central through hole. The quincuncial hole oil port F1 replaces drilling a big hole by drilling a plurality of uniformly distributed small holes on the cylinder barrel, thereby ensuring that the friction force of the sealing element passing through the oil port when the piston rod moves can be reduced while the overflowing is ensured, and the service life is prolonged.
The piston 3 is connected with the piston rod 6 through threads, and the piston 3 is fixedly fastened with the piston rod 6 through two screws in the radial direction. One end of the piston 3 close to the cylinder bottom 1 is provided with a buffer column 12, and the buffer column 12 is sleeved with a buffer sleeve 2; a counter bore matched with the buffer sleeve 2 is formed in the cylinder bottom 1; the axis of the buffer column 12 is provided with a through hole for communicating the rodless cavity D2 with the core tube rod cavity C2. The lower part of the counter bore of the cylinder bottom 1 is provided with an oil through hole G1 communicated with the upper surface of the cylinder bottom 1, a cylinder bottom one-way valve 13 is arranged in the oil through hole G1, and the cylinder bottom one-way valve 13 is communicated in one way from the counter bore of the cylinder bottom 1 to the upper surface of the cylinder bottom 1. The buffer column 12, the buffer sleeve 2 and the counter bore of the cylinder bottom 1 form a buffer structure, and the buffer structure forms throttling generated by fluid by using the annular clearance of the fluid when the piston rod retracts to the tail end of the stroke, so that the aim of decelerating and braking the piston rod is fulfilled.
The working principle is as follows:
when the piston rod 6 is extended;
the hydraulic system inputs pressure oil from an oil inlet A of the cylinder bottom 1 to generate pressure drive, and in the state: the pressure oil flows from an oil inlet A of the cylinder bottom 1 to an oil through opening G1 and then to a rodless cavity D2 to push the piston rod 6; a rodless cavity D2 extends to a quincunx hole oil port F1, an oil port F2 and then extends to an oil port B of the joint seat 8 to return to an oil tank;
when the piston rod 6 does not reach the full stroke and the guide sleeve 10 and the piston 3 are about to contact but do not contact, oil entering the rod cavity C1 from the port B1 of the second working oil port of the lug ring 9 enters the oil through port E1 and the oil through port E2, and as the rod head check valve 5 in the oil through port E1 is closed and the oil through port E2 is sealed and sealed, the oil way is closed at the moment, the next-stage oil cylinder cannot return oil, so that the next-stage oil cylinder cannot extend out;
when the piston rod 6 is in the full stroke, the oil through port E2 is oppositely communicated with the oil port F1 of the quincunx hole, the oil through port E1 is opposite to the oil port F2, and at the moment, the oil return path of the next-stage oil cylinder is communicated and can extend out. By the way, all the extending cylinders can extend out after the upper-stage oil cylinder extends out completely, and the multi-stage cylinders can extend out in sequence.
The embodiment utilizes the movement of the hydraulic cylinder to realize the opening or closing of the oil return path of the next-stage oil cylinder. When the hydraulic cylinder extends out, only after the first-stage hydraulic cylinder extends out completely, the other oil way is opened in the piston rod of the oil cylinder through the stroke, oil is supplied to the next-stage oil cylinder, and the like, and the multi-cylinder combination realizes sequential extension.
Claims (6)
1. A sequence telescopic hydraulic cylinder with a buffer stroke control function is characterized in that the lower end of a cylinder barrel (7) is connected with a cylinder bottom (1), and the cylinder bottom (1) is provided with an oil port A communicated with a rodless cavity D2; the upper end of the cylinder barrel (7) is connected with a guide sleeve (10), the cylinder barrel (7) is connected with a joint seat (8), and the joint seat (8) is provided with an oil port B communicated with a rod cavity D1;
the piston rod (6) is matched with and penetrates through the guide sleeve (10), the piston (3) is installed at the lower end of the piston rod (6), and the piston (3) is matched with the cylinder barrel (7); a core rod (11) is installed in the center of the piston rod (6), and the upper end of the piston (3) is connected with an earring (9); a first working oil port A1 and a second working oil port B1 are formed in the lug ring (9), the first working oil port A1 is communicated with a core tube rod cavity C2, and the second working oil port B1 is communicated with a piston rod cavity C1;
the method is characterized in that:
an oil through hole E1 is formed in the lower end of the piston rod (6), and an oil through hole E1 is communicated with a piston rod cavity C1 and a rod cavity D1; the rod head check valve (5) is arranged in the oil through hole E1, and the rod head check valve (5) is communicated with the piston rod cavity C1 in a one-way mode from the rod cavity D1;
an oil through port E2 is formed in the lower end of the piston rod (6) and the piston (3), an oil through port E2 is communicated with the piston rod cavity C1 and the outer circumferential surface of the piston (3), and an oil through port E2 is positioned on one side, close to the cylinder bottom (1), of the oil through port E1;
the cylinder barrel (7) is provided with a quincunx hole oil port F1 and an oil port F2 which are communicated with the oil port B of the joint seat (8), and the quincunx hole oil port F1 is positioned at one side of the oil port F2 close to the cylinder bottom (1); when the piston rod (6) extends to the maximum position, the oil through port E2 is communicated with the oil port F1, and the oil through port E1 is opposite to the oil port F2.
2. The cushioned stroke controlled sequential telescoping cylinder of claim 1, wherein: one end of the piston (3) close to the cylinder bottom (1) is provided with a buffer column (12), and the buffer column (12) is sleeved with a buffer sleeve (2); a counter bore matched with the buffer sleeve (2) is formed in the cylinder bottom (1); the axle center of the buffer column (12) is provided with a through hole for communicating the rodless cavity D2 with the core tube rod cavity C2.
3. The cushioned stroke controlled sequential telescoping cylinder of claim 2, wherein: an oil through hole G1 communicated with the upper surface of the cylinder bottom (1) is formed in the lower portion of the counter bore of the cylinder bottom (1), a cylinder bottom one-way valve (13) is installed in the oil through hole G1, and the cylinder bottom one-way valve (13) is communicated with the upper surface of the cylinder bottom (1) in a one-way mode from the counter bore of the cylinder bottom (1).
4. The cushioned stroke controlled sequential telescoping cylinder of claim 1, wherein: the lower end of the piston rod (6) is sleeved with a spacer bush (4) opposite to the oil through opening E1, and the spacer bush (4) is provided with a through hole opposite to the oil through opening E1.
5. The cushioned stroke controlled sequential telescoping cylinder of claim 1, wherein: the quincunx oil port F1 includes a central through hole in the middle and 6 peripheral through holes evenly distributed around the central through hole.
6. The cushioned stroke controlled sequential telescoping cylinder of claim 1, wherein: the piston (3) is connected with the piston rod (6) through threads, and the piston (3) is tightly fixed with the piston rod (6) through two screws in the radial direction.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121689006.6U CN215214190U (en) | 2021-07-23 | 2021-07-23 | Stroke-controlled sequential telescopic hydraulic cylinder with buffer |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121689006.6U CN215214190U (en) | 2021-07-23 | 2021-07-23 | Stroke-controlled sequential telescopic hydraulic cylinder with buffer |
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| CN215214190U true CN215214190U (en) | 2021-12-17 |
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| CN202121689006.6U Active CN215214190U (en) | 2021-07-23 | 2021-07-23 | Stroke-controlled sequential telescopic hydraulic cylinder with buffer |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114370441A (en) * | 2021-12-30 | 2022-04-19 | 中船重工中南装备有限责任公司 | Two-stage telescopic oil cylinder with buffering function |
-
2021
- 2021-07-23 CN CN202121689006.6U patent/CN215214190U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114370441A (en) * | 2021-12-30 | 2022-04-19 | 中船重工中南装备有限责任公司 | Two-stage telescopic oil cylinder with buffering function |
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