CN215486961U - Hydraulic cylinder for sequential expansion and contraction and sequential hydraulic system - Google Patents
Hydraulic cylinder for sequential expansion and contraction and sequential hydraulic system Download PDFInfo
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- CN215486961U CN215486961U CN202021365431.5U CN202021365431U CN215486961U CN 215486961 U CN215486961 U CN 215486961U CN 202021365431 U CN202021365431 U CN 202021365431U CN 215486961 U CN215486961 U CN 215486961U
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Abstract
The utility model relates to a hydraulic cylinder for sequential telescoping, which comprises a cylinder body, wherein a first oil port and a second oil port are arranged on the cylinder body; a third oil port and a fourth oil port are formed in the connecting seat; the moving part is movably inserted on the cylinder body and comprises a sequential piston and a piston rod, and the sequential piston and the connecting seat are respectively fixed at two ends of the piston rod; the first oil way is arranged on the moving part, is respectively communicated with the first oil port and the fourth oil port and is provided with a first check valve; the second oil way is respectively communicated with the second oil port and the third oil port and is provided with a second one-way valve; the third oil way is communicated with the third oil port; the third oil way is not communicated with the second oil port in the fully retracted state; the third oil way is not communicated with the second oil port in the extending state; and the third oil way is communicated with the second oil port in the fully extended state. The hydraulic cylinder does not need external sequence control, and has the advantages of simple structure, high universality, wide application range, stable and reliable action sequence, small pressure loss, low cost, compact structure and convenience in installation.
Description
Technical Field
The utility model relates to a hydraulic cylinder, in particular to a hydraulic cylinder for sequential expansion and contraction and a sequential hydraulic system.
Background
In engineering machinery, multiple groups of hydraulic cylinders of an executing element commonly act in sequence according to a preset sequence, for example, equipment such as a multi-level boom crane generally uses multiple groups of hydraulic cylinders for linkage operation, and the purpose that all levels of oil cylinders sequentially extend out or retract from a first-level cylinder to a tail-end cylinder is achieved. At present, the sequential action of the hydraulic cylinder mainly has three control modes: firstly, the area difference is controlled, the control mode has low cost and simple structure, but the area of the hydraulic cylinder which is firstly extended is larger than that of the hydraulic cylinder which is then extended, the area of the rod cavity which is firstly retracted into the hydraulic cylinder is larger than that of the rod cavity which is then retracted, and the use limitation is larger; and secondly, the sequence valve is controlled, the sequence valve is additionally arranged on the oil circuit, the expansion sequence of the hydraulic cylinders is controlled by adjusting the opening pressure of the sequence valve, when the pressure difference between the hydraulic cylinders is small, the action sequence is disordered, the greater the pressure difference of the sequence valve is, the better the reliability of the sequence action is, and meanwhile, the greater the pressure loss is, so that the sequence control method is not suitable for the sequence control of multiple groups of hydraulic cylinders. And thirdly, mechanical control is performed, the control mode mainly realizes the sequential action of each hydraulic cylinder by controlling the on-off of an oil way through an external mechanical device, the mode is not influenced by load pressure, pressure loss is small, the opening pressure of a valve core is not required to be adjusted, the reliability of the sequential action is good, but a control device is required to be designed according to the installation position of each hydraulic cylinder, and the universality is poor.
SUMMERY OF THE UTILITY MODEL
In order to solve the problems, the utility model provides a hydraulic cylinder for sequential extension and retraction, which realizes sequential extension and retraction of the hydraulic cylinder through arrangement of an internal oil circuit of the hydraulic cylinder, does not need external sequential control, and has the advantages of simple structure, high universality, wide application range, stable and reliable action sequence, small pressure loss and low cost, and the specific technical scheme is as follows:
a hydraulic cylinder for sequential telescoping, comprising: the oil cylinder comprises a cylinder body, wherein a first oil port is formed in the bottom of the cylinder body, and a second oil port is formed in the top of the cylinder body; the connecting seat is provided with a third oil port and a fourth oil port; the moving component is movably inserted on the cylinder body and comprises a sequential piston and a piston rod, and the sequential piston and the connecting seat are respectively fixed at two ends of the piston rod; the first oil way is arranged on the moving part and is respectively communicated with the first oil port and the fourth oil port; the first check valve is installed on the first oil path; the second oil way is respectively communicated with the second oil port and the third oil port; the second check valve is installed on the second oil path; the third oil way is communicated with the third oil port; the hydraulic cylinder for sequential telescoping comprises a fully retracted state, an extended state, a fully extended state and a retracted state; when the oil tank is in the extending state, the first check valve is opened, the first oil path is communicated, the second check valve is closed, the second oil path is not communicated, and the third oil path is not communicated with the second oil port; when the fully-extended state is achieved, the first check valve is opened, the first oil path is communicated, the second check valve is closed, the second oil path is not communicated, and the third oil path is communicated with the second oil port; in the retraction state, the first check valve is closed, the first oil path is communicated, the second check valve is opened, the second oil path is not communicated, and the third oil path is not communicated with the second oil port; and in the fully retracted state, the first check valve is opened, the first oil path is communicated, the second check valve is opened, the second oil path is communicated, and the third oil path is communicated with the second oil port.
Further, a rod body through hole is formed in the piston rod and is communicated with the third oil port; a first oil passing hole and a second oil passing hole which are communicated with the inner cavity of the cylinder body are formed in the second oil port; the first oil passage includes: the piston through hole is formed in the sequential piston and communicated with the first oil port, and the first check valve is installed on the piston through hole; the oil guide pipe is fixed in the piston through hole and is positioned in the rod body through hole, and the oil guide pipe is respectively communicated with the first check valve and the fourth oil port; the second oil passage includes: the second oil hole is formed in the sequential piston and located on one side of the second oil port, the second oil hole is communicated with the second oil port and the third oil port respectively, and the second check valve is mounted on the second oil hole; the third oil passage includes: a third oil groove provided on an outer circumferential surface of the sequential piston; the sealing rings are arranged on the outer circular surfaces of the sequential pistons and are positioned on two sides of the third oil groove; the third oil hole is arranged at the bottom of the third oil groove and is communicated with the third oil port; and when the piston rod extends completely, the second oil port, the first oil passing hole, the third oil groove, the third oil hole and the third oil port are communicated.
Furthermore, the outer diameter of the oil guide pipe is smaller than the inner diameter of the piston through hole, the piston through hole is communicated with the rod body through hole, and the second oil hole and the third oil hole are communicated with the piston through hole.
Furthermore, one end of the sequential piston is provided with a second oil groove, the bottom of the second oil groove is provided with a second oil hole, and the second oil groove is communicated with the second oil hole.
Further, the first check valve includes: one end of the first valve seat is provided with a valve seat through hole, and the first valve seat is fixed on the piston through hole; the first valve core is provided with a first valve rod, the diameter of the first valve rod is smaller than that of the valve seat through hole, the first valve rod is movably inserted into the valve seat through hole, the length of the first valve rod is larger than that of the valve seat through hole, and the first valve core is used for closing or opening the valve seat through hole; and one end of the first spring is pressed on the first valve core, and the other end of the first spring is pressed on the piston through hole.
Furthermore, a valve seat taper hole is formed in the other end of the first valve seat, the valve seat taper hole is communicated with the valve seat through hole, a sealing spherical surface is arranged on the first valve core, and the sealing spherical surface is opposite to the valve seat taper hole.
Furthermore, the second oil passing holes are small and provided with a plurality of small holes, and the diameter of the second oil passing holes is smaller than that of the sealing ring.
A sequential hydraulic system comprising: the hydraulic cylinders for sequential extension and retraction are not less than two and are sequentially connected in series; the one-level is used for the first hydraulic fluid port of one-level and the one-level second hydraulic fluid port of the flexible pneumatic cylinder of order all to be used for oil feed or oil return, the one-level third hydraulic fluid port that the one-level is used for the flexible pneumatic cylinder of order communicates with each other with the N level second hydraulic fluid port that the N level is used for the flexible pneumatic cylinder of order, the one-level fourth hydraulic fluid port that the one-level is used for the flexible pneumatic cylinder of order with the N level is used for the first hydraulic fluid port of N level of the flexible pneumatic cylinder of order to communicate with each other, N level is used for the flexible pneumatic cylinder of order N level third hydraulic fluid port and N level fourth hydraulic fluid port all to seal.
A method for controlling a sequentially telescoping hydraulic cylinder, comprising the steps of: the piston rod extends out from a fully retracted state, a first oil port feeds oil, a first check valve is opened, a first oil path is communicated, a second check valve is closed, a second oil path is communicated, and a third oil path is communicated with the second oil port; the piston rod continuously extends out, the first oil port feeds oil, the first check valve is opened, the first oil path is communicated, the second check valve is closed, the second oil path is communicated, the third oil path is communicated with the second oil port, and the second oil port returns oil; the piston rod is completely extended out, the first oil port is used for feeding oil, the first check valve is opened, the first oil path is communicated, the second check valve is closed, the second oil path is not communicated, the third oil path is communicated with the second oil port, and the second oil port is used for returning oil; the piston rod continuously retracts, the first oil port returns oil, the second oil port feeds oil, the first check valve is closed, the first oil way is closed, the second check valve is opened, the second oil way is communicated, and the third oil way is communicated with the second oil port until the piston rod completely retracts.
Compared with the prior art, the utility model has the following beneficial effects:
the hydraulic cylinder for sequential stretching provided by the utility model realizes sequential stretching of the hydraulic cylinder through the arrangement of the internal oil circuit of the hydraulic cylinder, does not need external sequential control, and has the advantages of simple structure, high universality, wide application range, stable and reliable action sequence, small pressure loss, low cost, compact structure and convenience in installation.
The sequential hydraulic system does not need complex external control, can stably and reliably realize sequential expansion, and has simple external oil circuit and convenient use.
Drawings
FIG. 1 is a cross-sectional view of a hydraulic cylinder for sequential telescoping;
FIG. 2 is a cross-sectional view of a first one-way valve;
FIG. 3 is a partial schematic view of the fully retracted state of the hydraulic cylinder for sequential retraction;
FIG. 4 is a partial schematic view of the hydraulic cylinder for sequential retraction in a fully extended condition;
FIG. 5 is a schematic diagram of a sequential hydraulic system using three hydraulic cylinders for sequential retraction, with the piston rods of the three hydraulic cylinders for sequential retraction all in a fully retracted state;
FIG. 6 is a schematic view of the one-stage sequentially telescoping cylinder of FIG. 5 with the piston rod extended;
fig. 7 is a schematic view of the three cylinders for sequential telescoping of fig. 5 with their piston rods fully extended.
Detailed Description
The utility model will now be further described with reference to the accompanying drawings.
Example one
As shown in fig. 1 to 4, the hydraulic cylinder for sequential telescoping includes: the oil cylinder comprises a cylinder body 1, wherein a first oil port 11 is formed in the bottom of the cylinder body 1, and a second oil port 12 is formed in the top of the cylinder body 1; the connecting seat 4 is provided with a third oil port 43 and a fourth oil port 44; the moving component is movably inserted on the cylinder body 1 and comprises a sequential piston 2 and a piston rod 3, and the sequential piston 2 and the connecting seat 4 are respectively fixed at two ends of the piston rod 3; a first oil path provided on the moving part, the first oil path being communicated with the first oil port 11 and the fourth oil port 44, respectively; the first check valve 21, the first check valve 21 is installed on the first oil circuit; the second oil path is respectively communicated with the second oil port 12 and the third oil port 43; the second check valve 22, the second check valve 22 is installed on the second oil circuit; a third oil passage communicated with the third oil port 43; the hydraulic cylinder for sequential telescoping comprises an extending state, a fully extending state, a retracting state and a fully retracting state; when the oil pump is in an extending state, the first check valve 21 is opened, the first oil path is communicated, the second check valve 22 is closed, the second oil path is not communicated, and the third oil path is not communicated with the second oil port 12; when the oil pipe is in a fully extended state, the first check valve 21 is opened, the first oil path is communicated, the second check valve 22 is closed, the second oil path is not communicated, and the third oil path is communicated with the second oil port 12; in the retraction state, the first check valve 21 is closed, the first oil path is not communicated, the second check valve 22 is opened, the second oil path is communicated, and the third oil path is not communicated with the second oil port 12; in the fully retracted state, the first check valve 21 is opened, the first oil passage is opened, the second check valve 22 is opened, the second oil passage is opened, and the third oil passage is not communicated with the second oil port 12.
A rod body through hole 31 is formed in the piston rod 3, and the rod body through hole 31 is communicated with the third oil port 43; a first oil passing hole 121 and a second oil passing hole 122 which are communicated with the inner cavity of the cylinder body 1 are arranged inside the second oil port 12; the first oil passage includes: the piston through hole 25 is formed in the sequential piston 2, the piston through hole 25 is communicated with the first oil port 11, and the first check valve 21 is installed on the piston through hole 25; the oil guide pipe 5 is fixed in the piston through hole 25 and is positioned in the rod body through hole 31, and the oil guide pipe 5 is respectively communicated with the first check valve 21 and the fourth oil port 44; the second oil passage includes: a second oil hole 222, the second oil hole 222 being disposed on the sequential piston 2 and located at one side of the second oil port 12, the second oil hole 222 being communicated with the second oil port 12 and the third oil port 43, respectively, and a second check valve 22 being installed on the second oil hole 222; the third oil passage includes: a third oil groove 231, the third oil groove 231 being provided on the outer circumferential surface of the sequential piston 2; a sealing ring 26, the sealing ring 26 being installed on the outer circumferential surface of the sequential piston 2 and located at both sides of the third oil groove 231; and a third oil hole 232, the third oil hole 232 being provided at the bottom of the third oil groove 231 and communicating with the third oil port 43; when the piston rod 3 is fully extended, the second port 12, the first oil passing hole 121, the third oil groove 231, the third oil hole 232, and the third port 43 are communicated with each other.
The piston through-hole 25 is provided at the center of the sequential piston 2, and is a stepped hole. The outer diameter of the oil guide pipe 5 is smaller than the inner diameter of the piston through hole 24, and the third oil hole 232 and the second oil hole 222 are communicated with the piston through hole 25.
The key point for the sequential telescopic hydraulic cylinder is that the second oil port 12, the first oil passing hole 121, the third oil groove 231, the third oil hole 232 and the third oil port 43 are the same as those of the ordinary hydraulic cylinder when the piston rod 3 extends or retracts, but when the sequential piston 2 moves to the top of the cylinder body 1, the first oil passing hole 121, the third oil groove 231, the third oil hole 232, the piston through hole 25 and the second oil port 12 are communicated, and oil return can be realized by hydraulic pressure of a next stage at the moment, so that the hydraulic cylinder of the next stage can extend, and sequential control is realized.
When the first oil port 11 is filled with oil to extend the piston rod 3, hydraulic oil can enter the next hydraulic cylinder through the first oil path, and the hydraulic oil of each hydraulic cylinder can only return oil through the second oil port 12 of the first hydraulic cylinder, that is, the first oil path can be conducted when the piston rod 3 extends, but is not conducted when the piston rod 3 retracts, the first oil path is conducted only when the piston rod 3 retracts completely, or the hydraulic oil is conducted from the first oil hole to the fourth oil port 44, the hydraulic oil is not conducted from the fourth oil port 44 to the first oil port 11, and the fourth oil port 44 is conducted only to the first oil port 11 when the piston rod 3 retracts completely. When hydraulic oil flows from the second oil port 12 to the third oil port 43, the second check valve 22 is opened, the second oil path is opened, but when the hydraulic oil flows from the third oil port 43 to the second oil hole 222, the second check valve 22 is closed, the second oil path is blocked, only the sequential piston 2 moves to the top of the cylinder body 1, namely, when the third oil path is communicated, the hydraulic oil can enter the second oil port 12 from the third oil port 43, oil return is realized, and therefore, only after the piston rod 3 of the sequential telescopic hydraulic cylinder of the first stage is completely extended, the piston rod 3 of the sequential telescopic hydraulic cylinder of the second stage can be extended, and then the piston rods 3 of the sequential telescopic hydraulic cylinders of the first stage are sequentially extended, and sequential extension is realized.
When the first oil port 11 is filled with oil and retracted, the first check valve 21 is blocked by hydraulic oil, the first oil way through which the hydraulic oil enters the first oil port 11 from the fourth oil port 44 is blocked, and therefore except that the sequential piston 2 of the first-level sequential telescopic hydraulic cylinder can be retracted, the sequential pistons 2 of the rest cylinder bodies 1 are not movable, and sequential retraction is realized.
The outer diameter of the oil guide pipe 5 is smaller than the inner diameter of the piston through hole 25, the piston through hole 25 is communicated with the rod body through hole 31, and the second oil hole 222 and the third oil hole 232 are communicated with the piston through hole 25.
One end of the sequential piston 2 is provided with a second oil groove 221, the bottom of the second oil groove 221 is provided with a second oil hole 222, and the second oil groove 221 is communicated with the second oil hole 12.
The second oil hole 222 is radially provided to facilitate the installation of the second check valve 22 while making the structure compact. The second oil groove 221 facilitates the radial arrangement of the second oil hole 222 and ensures that the second oil hole 222 communicates with the rod chamber of the cylinder block.
The first check valve 21 includes: a first valve seat 211, one end of the first valve seat 211 is provided with a valve seat through hole 212, and the first valve seat 211 is fixed on the piston through hole 25; the first valve core 213 is provided with a first valve rod 216, the diameter of the first valve rod 216 is smaller than that of the valve seat through hole 212, the first valve rod 216 is movably inserted into the valve seat through hole 212, the length of the first valve rod 216 is larger than that of the valve seat through hole 212, and the first valve core 213 is used for closing or opening the valve seat through hole 212; and a first spring 217, one end of the first spring 217 pressing on the first spool 213 and the other end pressing on the piston through hole 25.
The first valve stem 216 opens the first check valve 21 when the sequence piston 2 is at the bottom of the cylinder. The first spring 217 has a small spring force, so that the first check valve 21 can be conveniently opened, the sequential extension is ensured to be reliable, and the first check valve can be opened under the pressure of 0.4-0.8 MPa.
When the first valve rod 216 is in the fully retracted state, the first oil path is communicated, so that hydraulic oil can enter each hydraulic cylinder, and the sequential extension is continuous and smooth without obvious pause.
The other end of the first valve seat 211 is provided with a valve seat taper hole 215, the valve seat taper hole 215 is communicated with the valve seat through hole 212, the first valve core 213 is provided with a sealing spherical surface 214, and the sealing spherical surface 214 is arranged opposite to the valve seat taper hole 215.
The spherical surface and the conical surface have good sealing performance and long service life.
The second oil passing holes 122 are small holes and are provided in plurality, and the diameter of the second oil passing holes 122 is smaller than that of the seal ring 26. The second oil passing holes 122 are arranged in an array, and the aperture is 2-5mm, so that the seal ring 26 cannot be scratched when passing through the second oil holes 222, and the service life of the seal ring 26 is ensured.
The top of the cylinder body 1 is provided with a guide sleeve, and the piston rod 3 is movably inserted in the guide sleeve.
A method for controlling a sequentially telescoping hydraulic cylinder, comprising the steps of:
the piston rod 3 extends out from a fully retracted state, the first oil port 11 is filled with oil, the first check valve 21 is opened, the first oil path is communicated, the second check valve 22 is closed, the second oil path is not communicated, and the third oil path is not communicated with the second oil port 12;
the piston rod 3 continuously extends out, the first oil port 11 feeds oil, the first check valve 21 is opened, the first oil path is communicated, the second check valve 22 is closed, the second oil path is not communicated, the third oil path is not communicated with the second oil port 12, and the second oil port 12 feeds oil;
the piston rod 3 is completely extended out, oil is fed into the first oil port 11, the first check valve 21 is opened, the first oil path is communicated, the second check valve 22 is closed, the second oil path is not communicated, the third oil path is communicated with the second oil port 12, and oil is returned from the second oil port 12;
the piston rod 3 continuously retracts, the first oil port 11 returns oil, the second oil port 12 feeds oil, the first check valve 21 is closed, the first oil way is blocked, the second check valve 22 is opened, the second oil way is communicated, and the third oil way is not communicated with the second oil port 12 until the piston rod 3 is completely retracted.
Example two
On the basis of the first embodiment, the sequential hydraulic system comprises: be no less than two, and the flexible pneumatic cylinder of being used for in order of establishing ties in proper order, the one-level first hydraulic fluid port and the one-level second hydraulic fluid port that the one-level is used for the flexible pneumatic cylinder of order all are used for oil feed or oil return, the one-level third hydraulic fluid port that the one-level is used for the flexible pneumatic cylinder of order communicates with each other with the N level second hydraulic fluid port that the N level is used for the flexible pneumatic cylinder of order, the one-level fourth hydraulic fluid port that the one-level is used for the flexible pneumatic cylinder of order with the N level first hydraulic fluid port that is used for the flexible pneumatic cylinder of order communicates with each other, N level is used for the flexible pneumatic cylinder of order N level third hydraulic fluid port and N level fourth hydraulic fluid port all seal.
Three hydraulic cylinders for sequential expansion are connected in series for explanation, and the three hydraulic cylinders for sequential expansion are respectively a primary hydraulic cylinder for sequential expansion, a secondary hydraulic cylinder for sequential expansion and a tertiary hydraulic cylinder for sequential expansion.
The first-stage first oil port A1 and the first-stage second oil port A2 of the first-stage sequentially telescopic hydraulic cylinder are used for oil inlet or oil return, the first-stage third oil port A3 of the first-stage sequentially telescopic hydraulic cylinder is communicated with the second-stage second oil port B2 of the second-stage sequentially telescopic hydraulic cylinder, and the first-stage fourth oil port A4 of the first-stage sequentially telescopic hydraulic cylinder is communicated with the second-stage first oil port B1 of the second-stage sequentially telescopic hydraulic cylinder;
the second-stage third oil port B3 for the sequential telescopic hydraulic cylinder is communicated with the third-stage second oil port C2 for the sequential telescopic hydraulic cylinder, the second-stage fourth oil port B4 for the sequential telescopic hydraulic cylinder is communicated with the third-stage first oil port C1 for the sequential telescopic hydraulic cylinder, and the third-stage third oil port C3 and the third-stage fourth oil port C4 for the sequential telescopic hydraulic cylinder are both closed.
A rodless cavity is arranged between the sequential piston and the first oil port, and a rod cavity is arranged between the sequential piston and the second oil port.
The following first-stage, second-stage and third-stage sequential telescopic hydraulic cylinders are respectively referred to as a first-stage cylinder, a second-stage cylinder and a third-stage cylinder.
And (3) extending:
all piston rods for the sequential telescopic cylinders are in a fully retracted state at this time. When the first-stage first oil port A1 of the first-stage cylinder is connected with hydraulic oil, the hydraulic oil enters the first-stage rodless cavity, the hydraulic oil in the first-stage rodless cavity of the first-stage cylinder passes through the first-stage one-way valve, the first-stage oil guide pipe and the first-stage fourth oil port A4, then is introduced into the second-stage first oil port B1 of the second-stage cylinder through the external oil pipe, the hydraulic oil enters the second-stage rodless cavity of the second-stage cylinder, the hydraulic oil passes through the second-stage first one-way valve, the second-stage oil guide pipe and the second-stage fourth oil port B4, then enters the third-stage first oil port C1 of the third-stage cylinder through the external oil pipe, the hydraulic oil enters the third-stage rod cavity of the third-stage cylinder, then enters the third-stage oil guide pipe through the third-stage first one-way valve, and the hydraulic pressure stops in the third-stage oil guide pipe because the third-stage fourth oil port C4 is closed.
Therefore, when the rodless cavity oil of the first stage enters the hydraulic oil, the hydraulic oil can enter the rodless cavities of the hydraulic cylinders of the various stages. After the hydraulic oil enters the rodless cavities of all the stages, the piston rods of all the hydraulic cylinders are driven to extend, the hydraulic oil in the rod cavities of all the hydraulic cylinders is discharged through the first-stage second oil port A2 of the first-stage cylinder, obviously, the hydraulic oil in the rod cavities of the first-stage cylinder can be discharged through the first-stage second oil port A2, the first-stage piston rods can smoothly extend, meanwhile, the second-stage piston rods of the second-stage cylinder also have a tendency of extending, the hydraulic oil in the rod cavities of the second-stage cylinder needs to be discharged from the second-stage second oil port B2 and enters the cavity of the first-stage oil guide pipe through the external oil pipe and the first-stage third oil port A3 of the first-stage cylinder, the first-stage second one-way valve is closed, namely, the first-stage second one-way valve is closed when the hydraulic oil enters the first-stage second oil port A2 from the first-stage third oil port A3, at the moment, the first-stage third oil hole and the first-stage second oil port A2 are not communicated, namely, the first-stage third oil path is a second-stage rod cavity of the second-stage cylinder, the hydraulic oil return of the second-stage cylinder can not pass through the first-stage oil return cavity of the first-stage oil return, so that the secondary piston rod of the secondary cylinder cannot extend out.
After the piston rod of one-level jar stretches out completely, the one-level third oil groove on one-level order piston corresponds with the first oilhole of crossing of one-level on the one-level cylinder body, as shown in fig. 4, hydraulic oil in the one-level body of rod through-hole of one-level piston rod this moment can discharge from one-level second hydraulic fluid port A2 through one-level third oil groove and the first oilhole of crossing of one-level, the second grade piston rod of second grade jar can stretch out, and the tertiary pole chamber oil return runner of tertiary jar this moment has can only get through after the second grade piston rod that waits for the second grade jar stretches out completely, analogize with this, can accomplish the piston rod and stretch out in proper order.
A retraction stage:
at the moment, piston rods of all the hydraulic cylinders are in a fully extended state, and third oil passages of all the hydraulic cylinders are communicated. When the first-stage second oil port A2 of the first-stage cylinder is connected with hydraulic oil, the hydraulic oil enters the first-stage rod cavity and the rod body through hole of the first-stage piston rod, meanwhile, the hydraulic oil can be communicated with the first-stage third oil port A3 through the first-stage second check valve, the hydraulic oil enters the second-stage second oil port B2 of the second-stage cylinder through the first-stage third oil port A3 and an external pipeline and enters the second-stage rod cavity of the second-stage cylinder, the hydraulic oil in the second-stage rod cavity of the second-stage cylinder can enter the third-stage rod cavity of the third-stage cylinder through the second-stage second oil path, and therefore the hydraulic oil can enter the rod cavities of the hydraulic cylinders at all stages when the first-stage second oil port A2 of the first-stage cylinder is connected with the hydraulic oil. After the hydraulic oil enters the rod cavity, the piston rods of the hydraulic cylinders at all levels are driven to retract, the hydraulic oil in the rodless cavities at all levels needs to be discharged from the first-stage first oil port A1 of the first-stage cylinder, obviously, the hydraulic oil in the rodless cavity of the first-stage cylinder can be discharged from the first-stage first oil port A1, the piston rods at one level can be smoothly retracted, the hydraulic oil in the rodless cavity of the second-stage cylinder passes through the first-stage first oil port B1 at the second level, the external oil pipe and the fourth-stage oil port A4 at the first level of the first-stage cylinder and then enters the oil guide pipe at the first level of the first-stage cylinder, and the first one-stage check valve in the first-stage first oil path is closed, namely, the circulation from the fourth-stage oil port A4 to the first-stage first oil hole is that the first one-stage check valve cuts off, the first-stage first oil path is blocked, so that the piston rods at the second-stage cylinder cannot retract. When the first-stage piston rod of the first-stage cylinder moves to the bottom of the first-stage cylinder body or the first-stage cylinder retracts completely, as shown in fig. 3, the first-stage check valve is opened, the first oil path of the first stage is communicated, the oil return flow channel of the second-stage rodless cavity of the second-stage cylinder is opened at the moment, the second-stage piston rod can retract, after the second-stage piston rod of the second-stage cylinder moves to the bottom of the cylinder, the first check valve of the second stage is opened, the third-stage piston rod of the third-stage cylinder can retract, and the like, and the sequential retraction of the piston rods can be completed.
The technical principle of the present invention is described above in connection with specific embodiments. The description is made for the purpose of illustrating the principles of the utility model and should not be construed in any way as limiting the scope of the utility model. Based on the explanations herein, those skilled in the art will be able to conceive of other embodiments of the present invention without inventive step, which shall fall within the scope of the appended claims.
Claims (8)
1. Hydraulic cylinder for sequential telescopic movement, characterized in that it comprises:
the oil cylinder comprises a cylinder body (1), wherein a first oil port (11) is formed in the bottom of the cylinder body (1), and a second oil port (12) is formed in the top of the cylinder body (1);
the connecting seat (4) is provided with a third oil port (43) and a fourth oil port (44);
the moving component is movably inserted on the cylinder body (1), the moving component comprises a sequential piston (2) and a piston rod (3), and the sequential piston (2) and the connecting seat (4) are respectively fixed at two ends of the piston rod (3);
the first oil path is arranged on the moving component and is respectively communicated with the first oil port (11) and the fourth oil port (44);
a first check valve (21), the first check valve (21) being mounted on the first oil line;
the second oil way is respectively communicated with the second oil port (12) and the third oil port (43);
a second check valve (22), said second check valve (22) being mounted on said second oil line;
a third oil path communicated with the third oil port (43);
the hydraulic cylinder for sequential telescoping comprises an extending state, a fully extending state, a retracting state and a fully retracting state;
when the oil tank is in the extending state, the first check valve (21) is opened, the first oil way is communicated, the second check valve (22) is closed, the second oil way is not communicated, and the third oil way is not communicated with the second oil port (12);
when the oil pipe is in the fully extended state, the first check valve (21) is opened, the first oil way is communicated, the second check valve (22) is closed, the second oil way is not communicated, and the third oil way is communicated with the second oil port (12);
when the oil cylinder is in the retraction state, the first check valve (21) is closed, the first oil way is closed, the second check valve (22) is opened, the second oil way is open, and the third oil way is not communicated with the second oil port (12);
and in the fully retracted state, the first check valve (21) is opened, the first oil path is communicated, the second check valve (22) is opened, the second oil path is communicated, and the third oil path is communicated with the second oil port (12).
2. Hydraulic cylinder for sequential retraction according to claim 1,
a rod body through hole (31) is formed in the piston rod (3), and the rod body through hole (31) is communicated with the third oil port (43);
a first oil passing hole (121) and a second oil passing hole (122) which are communicated with the inner cavity of the cylinder body (1) are formed in the second oil port (12);
the first oil passage includes:
the piston through hole (25) is formed in the sequential piston (2), the piston through hole (25) is communicated with the first oil port (11), and the first check valve (21) is installed on the piston through hole (25); and
the oil guide pipe (5) is fixed in the piston through hole (25) and positioned in the rod body through hole (31), and the oil guide pipe (5) is respectively communicated with the first check valve (21) and the fourth oil port (44);
the second oil passage includes:
a second oil hole (222), the second oil hole (222) being disposed on the sequential piston (2) and located at one side of the second oil port (12), the second oil hole (222) being respectively communicated with the second oil port (12) and the third oil port (43), the second check valve (22) being installed on the second oil hole (222);
the third oil passage includes:
a third oil groove (231), the third oil groove (231) being provided on an outer circumferential surface of the sequential piston (2);
the sealing rings (26) are arranged on the outer circular surface of the sequential piston (2) and positioned on two sides of the third oil groove (231); and
a third oil hole (232), the third oil hole (232) being provided at the bottom of the third oil groove (231) and communicating with the third oil port (43);
when the piston rod (3) is completely extended, the second oil port (12), the first oil passing hole (121), the third oil groove (231), the third oil hole (232) and the third oil port (43) are communicated.
3. Hydraulic cylinder for sequential retraction according to claim 2,
the outer diameter of the oil guide pipe (5) is smaller than the inner diameter of the piston through hole (25), the piston through hole (25) is communicated with the rod body through hole (31), and the second oil hole (222) and the third oil hole (232) are communicated with the piston through hole (25).
4. Hydraulic cylinder for sequential retraction according to claim 2,
one end of the sequential piston (2) is provided with a second oil groove (221), the bottom of the second oil groove (221) is provided with a second oil hole (222), and the second oil groove (221) is communicated with the second oil hole (12).
5. Hydraulic cylinder for sequential retraction according to claim 2,
the first check valve (21) comprises:
a first valve seat (211), wherein one end of the first valve seat (211) is provided with a valve seat through hole (212), and the first valve seat (211) is fixed on the piston through hole (25);
the first valve core (213), a first valve rod (216) is arranged on the first valve core (213), the diameter of the first valve rod (216) is smaller than that of the valve seat through hole (212), the first valve rod (216) is movably inserted into the valve seat through hole (212), the length of the first valve rod (216) is larger than that of the valve seat through hole (212), and the first valve core (213) is used for closing or opening the valve seat through hole (212);
a first spring (217), one end of the first spring (217) pressing on the first spool (213) and the other end pressing on the piston through hole (25).
6. Hydraulic cylinder for sequential retraction according to claim 5,
the other end of the first valve seat (211) is provided with a valve seat taper hole (215), the valve seat taper hole (215) is communicated with the valve seat through hole (212), the first valve core (213) is provided with a sealing spherical surface (214), and the sealing spherical surface (214) is arranged opposite to the valve seat taper hole (215).
7. Hydraulic cylinder for sequential retraction according to claim 2,
the second oil passing holes (122) are small and are provided with a plurality of small holes, and the diameter of each second oil passing hole (122) is smaller than that of the seal ring (26).
8. A sequential hydraulic system, comprising:
the hydraulic cylinder for sequential telescoping of any one of claims 1 to 7, which is not less than two, and is connected in series in sequence;
the one-level is used for the first hydraulic fluid port of one-level and the one-level second hydraulic fluid port of the flexible pneumatic cylinder of order all to be used for oil feed or oil return, the one-level third hydraulic fluid port that the one-level is used for the flexible pneumatic cylinder of order communicates with each other with the N level second hydraulic fluid port that the N level is used for the flexible pneumatic cylinder of order, the one-level fourth hydraulic fluid port that the one-level is used for the flexible pneumatic cylinder of order with the N level is used for the first hydraulic fluid port of N level of the flexible pneumatic cylinder of order to communicate with each other, N level is used for the flexible pneumatic cylinder of order N level third hydraulic fluid port and N level fourth hydraulic fluid port all to seal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021365431.5U CN215486961U (en) | 2020-07-13 | 2020-07-13 | Hydraulic cylinder for sequential expansion and contraction and sequential hydraulic system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021365431.5U CN215486961U (en) | 2020-07-13 | 2020-07-13 | Hydraulic cylinder for sequential expansion and contraction and sequential hydraulic system |
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| Publication Number | Publication Date |
|---|---|
| CN215486961U true CN215486961U (en) | 2022-01-11 |
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|---|---|---|---|
| CN202021365431.5U Active CN215486961U (en) | 2020-07-13 | 2020-07-13 | Hydraulic cylinder for sequential expansion and contraction and sequential hydraulic system |
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| Country | Link |
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| CN (1) | CN215486961U (en) |
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