CN214304644U - Multi-stage central sleeve hydraulic cylinder structure capable of extending and retracting step by step - Google Patents
Multi-stage central sleeve hydraulic cylinder structure capable of extending and retracting step by step Download PDFInfo
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- CN214304644U CN214304644U CN202120209174.4U CN202120209174U CN214304644U CN 214304644 U CN214304644 U CN 214304644U CN 202120209174 U CN202120209174 U CN 202120209174U CN 214304644 U CN214304644 U CN 214304644U
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Abstract
The utility model relates to a multistage central sleeve hydraulic cylinder structure capable of extending and retracting step by step, which comprises a cylinder body, a multistage middle cylinder barrel and a piston rod, wherein, a front middle cylinder barrel in the multistage middle cylinder barrel is sleeved outside a rear middle cylinder barrel of the multistage middle cylinder barrel, the cylinder body is sleeved outside a first-stage middle cylinder barrel in the multistage middle cylinder barrel, and a last-stage middle cylinder barrel in the multistage middle cylinder barrel is sleeved outside the piston rod; the cylinder body is internally provided with a cylinder body sleeve pipe which runs through the cylinder barrel in the middle of the first stage, the cylinder barrel in the middle of each stage is provided with a cylinder barrel sleeve pipe, the cylinder body sleeve pipe is provided with a first oil guide hole, the cylinder barrel sleeve pipe is provided with a second oil guide hole, and the bottom of the cylinder barrel in the middle of each stage is provided with a communication oil way matched with the first oil guide hole and the second oil guide hole. The utility model discloses a cylinder and piston rod can realize stretching out step by step or withdrawal in the middle of at different levels, have solved among the prior art multistage piston hydraulic pressure and have taken place out of order the problem at different levels at the in-process that stretches out or withdraw.
Description
Technical Field
The utility model relates to a pneumatic cylinder technical field, more specifically say, it relates to a can stretch out multistage center sleeve pipe pneumatic cylinder structure of withdrawal step by step.
Background
The hydraulic cylinder is a hydraulic actuator which converts hydraulic energy into mechanical energy and performs linear reciprocating motion (or swinging motion). The hydraulic cylinder is an actuating mechanism in some machines and mainly provides push-pull force, and in some machines, a long-stroke hydraulic cylinder is needed, but the installation space size is limited, so that a multi-stage hydraulic cylinder is needed. At present, the order of extension of the multistage hydraulic cylinder in stages depends on the stress condition of a piston of each stage, the stage with large resultant force moves first, and the moving speed of each stage is different due to the fact that the flow of an oil source is constant and the volume of each stage is different. The problem of disorder exists in the existing multi-stage hydraulic cylinder with more than two stages, namely, when the multi-stage hydraulic cylinder with two stages and more than two stages is used simultaneously and the operation speed is the same, the oil sources of the multi-stage hydraulic cylinder with two stages and more than two stages are the same, each stage of piston is pressurized simultaneously, but because the friction force and other resistance of the hydraulic cylinder are different, the pistons with different diameters of the multi-stage hydraulic cylinder with two stages and more than two stages can operate simultaneously, the flow of the oil sources of each stage is the same, but the volume is different, so that the extension speed of each multi-stage hydraulic cylinder is different, in this time, the multi-stage hydraulic cylinder can be asynchronous, the stress of the multi-stage hydraulic cylinder is uneven and exceeds the rated load range of the multi-stage hydraulic cylinder, the multi-stage hydraulic cylinder body is deformed, the sealing element is damaged, and the service life of the multi-stage hydraulic cylinder is shortened or even scrapped.
SUMMERY OF THE UTILITY MODEL
Not enough to prior art exists, the utility model aims to provide a can stretch out multistage central sleeve pipe pneumatic cylinder structure of withdrawal step by step, cylinder and piston rod can realize stretching out step by step or withdrawal in the middle of at all levels, have solved among the prior art multistage piston hydraulic pressure and have taken place out of order problem at all levels at the in-process that stretches out or withdraws.
The above technical purpose of the present invention can be achieved by the following technical solutions:
a multi-stage central sleeve hydraulic cylinder structure capable of extending and retracting step by step comprises a cylinder body, a multi-stage middle cylinder barrel and a piston rod, wherein a front middle cylinder barrel in the multi-stage middle cylinder barrel is sleeved outside a rear middle cylinder barrel of the multi-stage middle cylinder barrel, the cylinder body is sleeved outside a first-stage middle cylinder barrel in the multi-stage middle cylinder barrel, and a last-stage middle cylinder barrel in the multi-stage middle cylinder barrel is sleeved outside the piston rod;
the cylinder body is provided with a first oil way leading to the rodless cavity of the cylinder body and a second oil way leading to the cylinder body sleeve, the first oil way and the second oil way are communicated through a main oil way, and the main oil way is communicated with a first oil pump;
the inner wall of the front middle cylinder barrel is connected with the outer wall of the rear middle cylinder barrel in a sliding mode, the front middle cylinder barrel is provided with a cylinder barrel sleeve which penetrates through the rear middle cylinder barrel, the cylinder barrel sleeve of the front middle cylinder barrel is connected with the bottom of the rear middle cylinder barrel in a sliding mode, the cylinder barrel sleeve of the rear middle cylinder barrel is sleeved outside the cylinder barrel sleeve of the front middle cylinder barrel, the cylinder barrel sleeve of the first-stage middle cylinder barrel is sleeved outside the cylinder barrel sleeve, a cylinder barrel rodless cavity is formed between the inner wall of the front middle cylinder barrel and the outer wall of the bottom of the rear middle cylinder barrel, the plurality of cylinder barrel sleeves are communicated with one another, the tail end of the cylinder barrel sleeve of the last-stage middle cylinder barrel is sealed, and the cylinder barrel sleeve is communicated with the cylinder barrel sleeve of the first-stage middle cylinder barrel;
the inner wall of the last-stage middle cylinder barrel is connected with the outer wall of the piston rod in a sliding mode, the piston rod is sleeved outside the cylinder barrel sleeve of the last-stage middle cylinder barrel and is connected with the cylinder barrel sleeve in a sliding mode, and the bottom of the piston rod and the inner wall of the bottom of the last-stage middle cylinder barrel form a piston rodless cavity;
the cylinder body sleeve pipe is provided with a first oil guide hole at one end far away from the bottom of the cylinder body, the bottom of the middle cylinder barrel is provided with a communicating oil way, the communicating oil way of the first-stage middle cylinder barrel is matched with the first oil guide hole, the communicating oil way of the first-stage middle cylinder barrel is communicated with the cylinder barrel rodless cavity in the first-stage middle cylinder barrel, the inlet of the communicating oil way of the first-stage middle cylinder barrel is communicated with the first oil guide hole in the state that the first-stage middle cylinder barrel is completely extended, the cylinder barrel sleeve pipe of the previous middle cylinder barrel is provided with a second oil guide hole at one end far away from the previous middle cylinder barrel, the communicating oil way of the latter middle cylinder barrel is communicated with the cylinder barrel rodless cavity of the latter middle cylinder barrel, the communicating oil way of the latter middle cylinder barrel is communicated with the second oil guide hole of the cylinder barrel sleeve pipe of the previous middle cylinder barrel in the state that the latter middle cylinder barrel is completely extended, and the communicating oil way of the last-stage middle cylinder barrel is communicated with the piston rodless cavity;
the cylinder body is provided with a rod cavity between the inner wall of the cylinder body and the outer wall of the first-stage middle cylinder barrel, a cylinder barrel rod cavity is arranged between the inner wall of the previous middle cylinder barrel and the outer wall of the next middle cylinder barrel, a piston rod cavity is arranged between the inner wall of the last-stage middle cylinder barrel and the outer wall of the piston cylinder, one end, close to the bottom of the cylinder body, of the outer wall of the middle cylinder barrel is provided with a communicating hole, the rod cavities of the two adjacent cylinder barrels are communicated through the communicating hole, the communicating hole of the first-stage middle cylinder barrel enables the rod cavity of the cylinder body to be communicated with the rod cavity of the cylinder barrel of the first-stage middle cylinder barrel, the communicating hole of the last-stage middle cylinder barrel enables the rod cavity of the cylinder barrel of the last-stage middle cylinder barrel to be communicated with the rod cavity of the piston, the side wall of the piston rod is provided with a third oil path, one end of the third oil path is communicated with the second oil pump all the time.
In one of them embodiment, the quantity of middle cylinder is one at least, the utility model discloses a middle cylinder quantity can increase according to actual need.
In one embodiment, the number of the intermediate cylinder barrels is one, and at this time, the first-stage intermediate cylinder barrel, the last-stage intermediate cylinder barrel, the previous intermediate cylinder barrel and the next intermediate cylinder barrel are all the same intermediate cylinder barrel.
In one embodiment, the number of the intermediate cylinder barrels is two, and in this case, the first-stage intermediate cylinder barrel is a previous intermediate cylinder barrel, and the last-stage intermediate cylinder barrel is a next intermediate cylinder barrel.
In one embodiment, the middle cylinder barrel comprises a barrel body serving as a side wall and a baffle ring serving as a bottom, the baffle ring is in threaded connection with the barrel body, the baffle ring is in sliding connection with a cylinder barrel sleeve or a cylinder body sleeve, a communicating oil path is arranged in the baffle ring, an inlet of the communicating oil path is provided with the inner wall of the baffle ring, an outlet of the communicating oil path leads to the interior of the barrel body connected with the baffle ring, two groups of sealing rings are arranged on the inner wall of the baffle ring, and the two groups of sealing rings are respectively positioned in front of and behind the inlet of the communicating oil path. When the baffle ring and the cylinder sleeve or the cylinder sleeve slide relatively, hydraulic oil in the cylinder cannot flow through a gap between the baffle ring and the cylinder sleeve or the cylinder sleeve.
In one embodiment, the outer surface of the cylinder body is provided with a first connection portion for facilitating connection with an external device.
In one embodiment, the outer end of the piston rod is provided with a second connection portion by which it can be connected to an external device.
In one embodiment, the length of the cylinder barrel sleeve is greater than the length of the cylinder barrel sleeve.
The utility model discloses following beneficial effect has:
the utility model discloses a intercommunication oil circuit of middle cylinder at different levels and the cooperation that corresponds the sheathed tube oil guide hole of middle cylinder at different levels, the cylinder and the piston rod stretch out in order step by step in the middle of having realized at different levels, there is the pole chamber through the cylinder body that communicates in proper order, a plurality of cylinders have the cooperation that pole chamber and piston have the pole chamber, the orderly withdrawal step by step of middle cylinder and piston rod has been realized at different levels, under the stable condition of flow pressure in the oil source, make the cylinder body load balanced, the damage of cylinder body has effectively been avoided, the two-stage and above multistage pneumatic cylinder stretches out simultaneously and can not appear the condition of in disorder level, the problem of the disorder of multistage piston hydraulic pressure at different levels at the in-process that stretches out or retracts among the prior art has been solved.
Drawings
FIG. 1 is a schematic diagram of the present invention when the pistons at each stage are not actuated;
FIG. 2 is an enlarged schematic view at A in FIG. 1;
FIG. 3 is an enlarged schematic view at B of FIG. 1;
FIG. 4 is a schematic view of the primary piston of the present invention fully extended;
FIG. 5 is an enlarged schematic view at C in FIG. 4;
fig. 6 is an enlarged schematic view at D in fig. 4.
In the figure: 1-cylinder body, 2-first middle cylinder barrel, 3-second middle cylinder barrel, 4-third middle cylinder barrel, 5-piston rod, 6-baffle ring, 7-cylinder body sleeve, 8-first cylinder barrel sleeve, 9-second cylinder barrel sleeve, 10-third cylinder barrel sleeve, 11-cylinder body with rod cavity, 12-first cylinder barrel with rod cavity, 13-second cylinder barrel with rod cavity, 14-piston with rod cavity, 15-main oil channel, 16-first oil channel, 17-second oil channel, 18-third oil channel, 19-first connecting part, 20-second connecting part, 21-communicating oil channel, 22-first oil guide hole, 23-second oil guide hole, 24-communicating hole and 25-sealing ring.
Detailed Description
The present invention will be described in detail with reference to the accompanying drawings and examples.
It should be noted that all the directional terms such as "upper" and "lower" referred to herein are used with respect to the view of the drawings, and are only for convenience of description, and should not be construed as limiting the technical solution.
A multi-stage central sleeve hydraulic cylinder structure capable of extending and retracting step by step comprises a cylinder body 1, multi-stage intermediate cylinder barrels and a piston rod 5, wherein a front intermediate cylinder barrel in the multi-stage intermediate cylinder barrels is sleeved outside a rear intermediate cylinder barrel of the multi-stage intermediate cylinder barrels, the cylinder body 1 is sleeved outside a first-stage intermediate cylinder barrel in the multi-stage intermediate cylinder barrels, and a last-stage intermediate cylinder barrel in the multi-stage intermediate cylinder barrels is sleeved outside the piston rod 5;
the cylinder body 1 is provided with a cylinder body casing pipe 7 penetrating through the first-stage middle cylinder barrel, the cylinder body casing pipe 7 is of a hollow structure, the cylinder body casing pipe 7 is in sliding connection with the bottom of the first-stage middle cylinder barrel, a cylinder body rodless cavity is formed between the outer wall of the bottom of the first-stage middle cylinder barrel and the inner wall of the cylinder body 1, the cylinder body 1 is provided with a first oil way 16 leading to the cylinder body rodless cavity and a second oil way 17 leading to the cylinder body casing pipe 7, the first oil way 16 and the second oil way 17 are communicated through a main oil way 15, and the main oil way 15 is communicated with a first oil pump;
the inner wall of a front middle cylinder barrel is connected with the outer wall of a rear middle cylinder barrel in a sliding mode, a cylinder barrel sleeve penetrating through the rear middle cylinder barrel is arranged on the front middle cylinder barrel, the cylinder barrel sleeve of the front middle cylinder barrel is connected with the bottom of the rear middle cylinder barrel in a sliding mode, the cylinder barrel sleeve of the rear middle cylinder barrel is sleeved outside the cylinder barrel sleeve of the front middle cylinder barrel, the cylinder barrel sleeve of a first-stage middle cylinder barrel is sleeved outside a cylinder body sleeve 7, a cylinder barrel rodless cavity is formed between the inner wall of the front middle cylinder barrel and the outer wall of the bottom of the rear middle cylinder barrel, a plurality of cylinder barrel sleeves are communicated with one another, the tail end of the cylinder barrel sleeve of the last-stage middle cylinder barrel is sealed, and the cylinder body sleeve 7 is communicated with the cylinder barrel sleeve of the first-stage middle cylinder barrel;
the inner wall of the last-stage middle cylinder barrel is connected with the outer wall of a piston rod 5 in a sliding mode, the piston rod 5 is sleeved outside a cylinder barrel sleeve of the last-stage middle cylinder barrel and is connected with the cylinder barrel sleeve in a sliding mode, and a piston rodless cavity is formed by the bottom of the piston rod 5 and the inner wall of the bottom of the last-stage middle cylinder barrel;
one end of the cylinder body sleeve 7 far away from the bottom of the cylinder body 1 is provided with a first oil guide hole 22, the bottom of the middle cylinder barrel is provided with a communicating oil path 21, the communicating oil path 21 of the first-stage middle cylinder barrel is matched with the first oil guide hole 22, and the communicating oil path 21 of the first-stage middle cylinder barrel leads to the rodless cavity of the cylinder barrel in the first-stage middle cylinder barrel, under the state that the first-stage middle cylinder barrel is completely extended out, the inlet of the communicating oil path 21 of the first-stage middle cylinder barrel is communicated with the first oil guide hole 22, one end of the cylinder barrel sleeve of the previous middle cylinder barrel, which is far away from the previous middle cylinder barrel, is provided with the second oil guide hole 23, the communicating oil path 21 of the latter middle cylinder barrel leads to the cylinder barrel rodless cavity of the latter middle cylinder barrel, under the state that the rear middle cylinder barrel is completely extended out, the communication oil path 21 of the rear middle cylinder barrel is communicated with the second oil guide hole 23 of the cylinder barrel sleeve of the front middle cylinder barrel, and the communication oil path 21 of the last-stage middle cylinder barrel leads to the rodless cavity of the piston;
a cylinder body rod cavity 11 is arranged between the inner wall of the cylinder body 1 and the outer wall of the first-stage middle cylinder barrel, a cylinder barrel rod cavity is arranged between the inner wall of the previous middle cylinder barrel and the outer wall of the next middle cylinder barrel, a piston rod cavity 14 is arranged between the inner wall of the last-stage middle cylinder barrel and the outer wall of the piston cylinder, communication holes 24 are respectively arranged at one end of the outer wall of the middle cylinder barrel, which is close to the bottom of the cylinder body 1, the rod cavities of the two adjacent cylinder barrels are communicated through the communication holes 24, the communication hole 24 of the first-stage middle cylinder barrel communicates the cylinder body rod cavity 11 with the cylinder barrel rod cavity of the first-stage middle cylinder barrel, the communication hole 24 of the last-stage middle cylinder barrel communicates the cylinder barrel rod cavity of the last-stage middle cylinder barrel with the piston rod cavity 14, and a third oil path 18 is arranged on the side wall of the piston rod 5, one end of the third oil path 18 is always communicated with the piston rod cavity 14, and the other end of the third oil path 18 is communicated with a second oil pump.
Wherein, the quantity of middle cylinder is one at least, the utility model discloses a middle cylinder quantity can increase according to actual need.
In this embodiment, the middle cylinder barrel comprises a barrel body serving as a side wall and a baffle ring 6 serving as a bottom, the baffle ring 6 is in threaded connection with the barrel body, the baffle ring 6 is in sliding connection with a cylinder barrel sleeve or a cylinder body sleeve 7, a communicating oil way 21 is arranged in the baffle ring 6, an inlet of the communicating oil way 21 is provided with the inner wall of the baffle ring 6, an outlet of the communicating oil way 21 leads to the inside of the barrel body connected with the baffle ring 6, the inner wall of the baffle ring 6 is provided with two groups of sealing rings 25, and the two groups of sealing rings 25 are respectively positioned in front of and behind the inlet of the communicating oil way 21. When the baffle ring 6 and the cylinder sleeve or the cylinder sleeve 7 slide relatively, hydraulic oil in the cylinder body cannot flow through a gap between the baffle ring 6 and the cylinder sleeve or the cylinder sleeve 7.
As shown in fig. 1-6, the number of the middle cylinders is three for illustration, for convenience of description, the first middle cylinder is represented by the first middle cylinder 2, the second middle cylinder is represented by the second middle cylinder 3, the last middle cylinder is represented by the third middle cylinder 4, two cylinder rodless cavities and two cylinder rod cavities exist between the three middle cylinders, the two cylinder rod cavities are distinguished by the first cylinder rod cavity 12 and the second cylinder rod cavity 13, the two cylinder rodless cavities are distinguished by the first cylinder rodless cavity and the second cylinder rodless cavity, and in addition, the cylinder sleeves of the three middle cylinders are also distinguished by the first cylinder sleeve 8, the second cylinder sleeve 9 and the third cylinder sleeve 10 in sequence, the utility model discloses a use method as follows:
the extension process of each stage of middle cylinder barrel and piston rod 5 is as follows:
the first oil pump is communicated with a main oil path 15 of the cylinder body 1, hydraulic oil is input into the cylinder body 1, the hydraulic oil enters a rodless cavity of the cylinder body through a first oil path 16 to push the first intermediate cylinder barrel 2 to extend outwards along the cylinder sleeve 7, meanwhile, the hydraulic oil enters the cylinder sleeve 7 through a second oil path 17, as the cylinder sleeve 7, the first cylinder sleeve 8, the second cylinder sleeve 9 and the third cylinder sleeve 10 are communicated, and the tail end of the third cylinder sleeve 10 is sealed, the hydraulic oil finally reaches the third cylinder sleeve 10, because the rodless cavity of the first cylinder barrel, the rodless cavity of the second cylinder barrel and the rodless cavity of the piston are all in a compressed state at the moment, the hydraulic oil entering the third cylinder sleeve 10 can not push the piston rod 5 to move on the third cylinder sleeve 10, namely the first intermediate cylinder barrel 2, the intermediate cylinder barrel 3, the third intermediate cylinder barrel 4 and the piston rod 5 are taken as a whole, the whole is driven by the first middle cylinder barrel 2, the hydraulic oil entering the third cylinder barrel sleeve 10 can only push the first middle cylinder barrel 2 and the cylinder body sleeve 7 to move relatively, and the first middle cylinder barrel 2 extends outwards;
when the first intermediate cylinder barrel 2 moves to the end part of the cylinder sleeve 7, the first intermediate cylinder barrel 2 reaches the extending extreme position, the communication oil way 21 on the baffle ring 6 of the first intermediate cylinder barrel 2 is aligned with the first oil guide hole 22 at the end part of the cylinder sleeve 7, and the hydraulic oil in the cylinder sleeve 7 flows through the first oil guide hole 22 and the communication oil way 21 and enters the rodless cavity of the first cylinder barrel to push the second intermediate cylinder barrel 3 to continue to extend forwards along the first cylinder sleeve 8; when the second middle cylinder barrel 3 moves to the extended extreme position, the communicating oil path 21 on the baffle ring 6 of the second middle cylinder barrel 3 is aligned with the second oil guide hole 23 at the end part of the first cylinder barrel sleeve 8, and hydraulic oil in the first cylinder barrel sleeve 8 flows through the second oil guide hole 23 and the communicating oil path 21 and enters the rodless cavity of the second cylinder barrel to push the third middle cylinder barrel 4 to continue to extend forwards along the second cylinder barrel sleeve 9; when cylinder 4 moves to the extreme position that stretches out in the middle of the third, intercommunication oil circuit 21 on the fender ring 6 of cylinder 4 is led oilhole 23 with the second of the 9 tip of second cylinder sleeve and is aimed at in the middle of the third, and the hydraulic oil in the second cylinder sleeve 9 flows through the second and leads oilhole 23 and intercommunication oil circuit 21 and gets into the no pole intracavity of piston, promotes piston rod 5 and continues to stretch out to the extreme position that can stretch out of piston rod 5 forward along third cylinder sleeve 10, to this, the utility model discloses accomplish stretching out in order of middle cylinder at different levels and piston rod 5.
It should be noted that, the cylinder body has the pole chamber 11, the first cylinder has the pole chamber 12, the second cylinder has between the pole chamber 13 and the piston has the pole chamber 14, two liang communicate through the intercommunicating pore 24, and the piston has the pole chamber 14 to communicate with the second oil pump through the third oil circuit 18, in the process that middle cylinder at all levels and piston rod 5 are stretched out in order, the second oil pump is not started all the time, the cylinder body has the pole chamber 11, the first cylinder has the pole chamber 12, the second cylinder has the pole chamber 13 and the piston has the pole chamber 14 hydraulic oil finally to discharge through the third oil circuit 18, the concrete process is as follows:
in the process that the first middle cylinder barrel 2 extends out, the volume of the rod cavity 11 of the cylinder body is gradually reduced, hydraulic oil in the rod cavity 11 of the cylinder body enters the rod cavity 12 of the adjacent first cylinder barrel through the communicating hole 24, and as the rod cavity 11 of the cylinder body, the rod cavity 12 of the first cylinder barrel, the rod cavity 13 of the second cylinder barrel and the rod cavity 14 of the piston are communicated, the hydraulic oil in the rod cavity 11 of the cylinder body is gradually discharged, and when the first middle cylinder barrel 2 extends out to the limit position, the volume of the rod cavity 11 of the cylinder body reaches the minimum; similarly, in the process that the second middle cylinder barrel 3 extends out, the volume of the rod cavity 12 of the first cylinder barrel is gradually reduced, hydraulic oil in the rod cavity 12 of the first cylinder barrel is gradually discharged, and when the second middle cylinder barrel 3 extends out to the limit position, the volume of the rod cavity 12 of the first cylinder barrel is minimum; in the process that the third middle cylinder barrel 4 extends out, the volume of the rod cavity 13 of the second cylinder barrel is gradually reduced, hydraulic oil in the rod cavity 13 of the second cylinder barrel is gradually discharged, and when the third middle cylinder barrel 4 extends out to the limit position, the volume of the rod cavity 13 of the second cylinder barrel is minimum; during the process of extending the piston rod 5, the volume of the piston rod chamber 14 is gradually reduced, the hydraulic oil in the piston rod chamber 14 is gradually discharged, when the piston extends to the extreme position, the volume of the piston rod chamber 14 reaches the minimum, and at the moment, the piston rod chamber 14 is still communicated with the third oil path 18.
Retraction process of the intermediate cylinder and piston rod 5 of each stage:
after the middle cylinder barrel and the piston rod 5 at each stage are completely extended, the cylinder body rod cavity 11, the first cylinder barrel rod cavity 12, the second cylinder barrel rod cavity 13 and the piston rod cavity 14 are all in the minimum compression state;
the second oil pump is communicated with the third oil path 18, hydraulic oil is injected into the piston rod cavity 14 through the third oil path 18, the piston rod cavity 14 is gradually expanded to enable the piston rod 5 to retract into the third intermediate cylinder barrel 4, the hydraulic oil in the piston rod-free cavity enters the second cylinder barrel sleeve 9 through the communicating oil path 21 of the third intermediate cylinder barrel 4 and the second oil guide hole 23 of the second cylinder barrel sleeve 9, and the hydraulic oil enters the second oil path 17 through the second cylinder barrel sleeve 9, the first cylinder barrel sleeve 8 and the cylinder barrel sleeve 7 due to the fact that the cylinder barrel sleeve 7, the first cylinder barrel sleeve 8, the second cylinder barrel sleeve 9 and the third cylinder barrel sleeve 10 are communicated, and therefore the hydraulic oil flows out through the main oil path 15;
when the piston rod 5 is completely retracted into the third middle cylinder barrel 4, the volume of the piston rodless cavity is minimum, the volume of the piston rod cavity 14 reaches the maximum, and the piston rod cavity 14 is communicated with the second cylinder barrel rod cavity 13 through the communicating hole 24, so that hydraulic oil in the piston rod cavity 14 enters the second cylinder barrel rod cavity 13, the volume of the second cylinder barrel rod cavity 13 is gradually increased, the third middle cylinder barrel 4 is pushed to retract towards the third middle cylinder barrel 4, and the hydraulic oil in the second cylinder rod-less cavity flows into the first cylinder barrel sleeve 8 through the communicating oil way 21 of the third middle cylinder barrel 4 and the second oil guide hole 23 of the first cylinder barrel sleeve 8, and flows out through the cylinder barrel sleeve 7, the second oil way 17 and the main oil way 15 in sequence;
when the third middle cylinder barrel 4 is completely retracted into the second middle cylinder barrel 3, the volume of the rodless cavity of the second cylinder barrel is minimum, the volume of the rod cavity 13 of the second cylinder barrel is maximum at the moment, and the rod cavity 13 of the second cylinder barrel is communicated with the rod cavity 12 of the first cylinder barrel through the through hole at the moment, so that the hydraulic oil in the rod cavity 13 of the second cylinder barrel enters the rod cavity 12 of the first cylinder barrel, the volume of the rod cavity 12 of the first cylinder barrel is gradually increased, the second middle cylinder barrel 3 is pushed to retract towards the first middle cylinder barrel 2, the hydraulic oil in the rodless cavity of the first cylinder barrel flows into the cylinder barrel sleeve 7 through the communication oil passage 21 of the second middle cylinder barrel 3 and the second oil guide hole 23 of the first cylinder barrel sleeve 8, and flows out through the second oil passage 17 and the main oil passage 15;
when cylinder 3 during complete withdrawal in first middle cylinder 2 in the middle of the second, first cylinder has the volume in pole chamber 12 to reach the biggest, and first cylinder has pole chamber 12 to have pole chamber 11 intercommunication through intercommunicating pore 24 and cylinder body at this moment, and first cylinder has hydraulic oil entering cylinder body in pole chamber 12 to have and promotes in the pole chamber 11 cylinder body 1 of complete withdrawal in first middle cylinder 2, and hydraulic oil in the cylinder body rodless chamber flows into main oil circuit 15 through first oil circuit 16 and second oil circuit 17, finally flows out to this, the utility model discloses the orderly withdrawal of middle cylinder at different levels and piston rod 5 has been accomplished.
In addition, in the extending process of the second middle cylinder 3, the rod cavity 12 of the first cylinder is not communicated with the rod cavity 11 of the cylinder body, at the moment, the rod cavity 11 of the cylinder body is communicated with the rodless cavity of the first cylinder through the communicating hole 24, because the rodless cavity of the first cylinder barrel is filled with hydraulic oil, even if the hydraulic oil in the rodless cavity of the first cylinder barrel enters the rod cavity 11 of the cylinder body, the volume of the rod cavity 11 of the cylinder body cannot be enlarged, therefore, the rodless cavity of the cylinder body can not be compressed, namely the connection between the rod cavity 11 of the cylinder body and the rodless cavity of the first cylinder barrel can not influence the gradual extension of the multi-stage piston, and similarly, in the process that the third middle cylinder barrel 4 and the piston rod 5 extend out, the communication between the rod cavity 12 of the first cylinder barrel and the rodless cavity of the second cylinder barrel and the communication between the rod cavity 13 of the second cylinder barrel and the rodless cavity of the piston do not influence the gradual extension of the multistage piston and do not influence the gradual extension of the middle cylinder barrels and the piston rods 5 at all stages.
The utility model is suitable for a middle cylinder quantity is more than or equal to one's pneumatic cylinder. For example, when the number of the middle cylinder barrels is one, the first-stage middle cylinder barrel, the last-stage middle cylinder barrel, the previous middle cylinder barrel and the next middle cylinder barrel are all the same middle cylinder barrel; or, when the number of the middle cylinder barrels is two, the first-stage middle cylinder barrel is the previous middle cylinder barrel, and the last-stage middle cylinder barrel is the next middle cylinder barrel.
In the present embodiment, the outer surface of the cylinder block 1 is provided with a first connection portion 19 to facilitate connection with an external device.
In this embodiment, the outer end of the piston rod 5 is provided with a second connection portion 20, and the second connection portion 20 can be connected with an external device.
In this embodiment, the length of the cylinder tube sleeve is greater than the length of the cylinder tube sleeve 7.
It is above only the utility model discloses a preferred embodiment, the utility model discloses a scope of protection does not only confine above-mentioned embodiment, the all belongs to the utility model discloses a technical scheme under the thinking all belongs to the utility model discloses a scope of protection. It should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (8)
1. A multi-stage central sleeve hydraulic cylinder structure capable of extending and retracting step by step is characterized by comprising a cylinder body (1), a multi-stage middle cylinder barrel and a piston rod (5), wherein a front middle cylinder barrel in the multi-stage middle cylinder barrel is sleeved outside a rear middle cylinder barrel of the multi-stage middle cylinder barrel, the cylinder body (1) is sleeved outside a first-stage middle cylinder barrel in the multi-stage middle cylinder barrel, and a last-stage middle cylinder barrel in the multi-stage middle cylinder barrel is sleeved outside the piston rod (5);
the cylinder body (1) is provided with a first oil way (16) leading to the rodless cavity of the cylinder body and a second oil way (17) leading to the cylinder body sleeve (7), the first oil way (16) is communicated with the second oil way (17) through a main oil way (15), and the main oil way (15) is communicated with a first oil pump;
the inner wall of a front middle cylinder barrel is connected with the outer wall of a rear middle cylinder barrel in a sliding mode, a cylinder barrel sleeve penetrating through the rear middle cylinder barrel is arranged on the front middle cylinder barrel, the cylinder barrel sleeve of the front middle cylinder barrel is connected with the bottom of the rear middle cylinder barrel in a sliding mode, the cylinder barrel sleeve of the rear middle cylinder barrel is sleeved outside the cylinder barrel sleeve of the front middle cylinder barrel, the cylinder barrel sleeve of the first-stage middle cylinder barrel is sleeved outside a cylinder body sleeve (7), a cylinder barrel rodless cavity is formed between the inner wall of the front middle cylinder barrel and the outer wall of the bottom of the rear middle cylinder barrel, the cylinder barrel sleeves are communicated with one another, the tail end of the cylinder barrel sleeve of the last-stage middle cylinder barrel is sealed, and the cylinder body sleeve (7) is communicated with the cylinder barrel sleeve of the first-stage middle cylinder barrel;
the inner wall of the last-stage middle cylinder barrel is in sliding connection with the outer wall of a piston rod (5), the piston rod (5) is sleeved outside a cylinder barrel sleeve of the last-stage middle cylinder barrel and is in sliding connection with the cylinder barrel sleeve, and a piston rodless cavity is formed by the bottom of the piston rod (5) and the inner wall of the bottom of the last-stage middle cylinder barrel;
a first oil guide hole (22) is formed in one end, far away from the bottom of the cylinder body (1), of the cylinder body sleeve (7), a communicating oil way (21) is formed in the bottom of each middle cylinder barrel, the communicating oil way (21) of the first-stage middle cylinder barrel is matched with the first oil guide hole (22), the communicating oil way (21) of the first-stage middle cylinder barrel is communicated with a cylinder barrel rodless cavity in the first-stage middle cylinder barrel, an inlet of the communicating oil way (21) of the first-stage middle cylinder barrel is communicated with the first oil guide hole (22) in the state that the first-stage middle cylinder barrel is completely extended out, a second oil guide hole (23) is formed in one end, far away from the previous middle cylinder barrel, of the cylinder barrel sleeve of the previous middle cylinder barrel, the communicating oil way (21) of the next middle cylinder barrel is communicated with the second oil guide hole (23) of the cylinder barrel sleeve of the previous middle cylinder barrel in the state that the next middle cylinder barrel is completely extended out, a communicating oil path (21) of the final-stage middle cylinder barrel leads to a piston rodless cavity;
a cylinder body rod cavity (11) is arranged between the inner wall of the cylinder body (1) and the outer wall of the first-stage middle cylinder barrel, a cylinder barrel rod cavity is arranged between the inner wall of the previous middle cylinder barrel and the outer wall of the next middle cylinder barrel, a piston rod cavity (14) is arranged between the inner wall of the last-stage middle cylinder barrel and the outer wall of the piston cylinder, communication holes (24) are respectively arranged at one end, close to the bottom of the cylinder body (1), of the outer wall of the middle cylinder barrel, the rod cavities of the two adjacent cylinder barrels are communicated through the communication holes (24), the cylinder barrel rod cavity (11) of the cylinder body is communicated with the cylinder barrel rod cavity of the first-stage middle cylinder barrel through the communication holes (24) of the first-stage middle cylinder barrel, the cylinder barrel rod cavity of the last-stage middle cylinder barrel is communicated with the piston rod cavity (14) through the communication holes (24) of the last-stage middle cylinder barrel, a third oil way (18) is arranged on the side wall of the piston rod (5), one end of the third oil way (18) is always communicated with the piston rod cavity (14), the other end of the third oil passage (18) is communicated with a second oil pump.
2. The multi-stage retractable center tube hydraulic cylinder structure as claimed in claim 1, wherein the number of the intermediate cylinder barrels is at least one.
3. The multi-stage center sleeve hydraulic cylinder structure capable of being extended and retracted step by step as claimed in claim 2, wherein the number of the intermediate cylinder barrels is one, and at this time, the first-stage intermediate cylinder barrel, the last-stage intermediate cylinder barrel, the previous intermediate cylinder barrel and the next intermediate cylinder barrel are all the same intermediate cylinder barrel.
4. The multi-stage center sleeve hydraulic cylinder structure capable of being extended and retracted step by step as claimed in claim 2, wherein the number of the intermediate cylinder barrels is two, and at this time, the first-stage intermediate cylinder barrel is a previous intermediate cylinder barrel, and the last-stage intermediate cylinder barrel is a next intermediate cylinder barrel.
5. The multi-stage center sleeve hydraulic cylinder structure capable of gradually extending and retracting according to any one of claims 1 to 4, wherein the middle cylinder barrel comprises a cylinder body serving as a side wall and a baffle ring (6) serving as a bottom, the baffle ring (6) is in threaded connection with the cylinder body, the baffle ring (6) is in sliding connection with the cylinder barrel sleeve or the cylinder body sleeve (7), a communicating oil way (21) is arranged in the baffle ring (6), the inlet of the communicating oil way (21) is provided with the inner wall of the baffle ring (6), the outlet of the communicating oil way (21) is communicated to the inside of the cylinder body connected with the baffle ring (6), the inner wall of the baffle ring (6) is provided with two groups of sealing rings (25), and the two groups of sealing rings (25) are respectively positioned in front of and behind the inlet of the communicating oil way (21).
6. The structure of a multi-stage center-tube hydraulic cylinder that can be extended and retracted stepwise according to claim 5, wherein the outer surface of the cylinder body (1) is provided with a first connecting portion (19) for facilitating connection with an external device.
7. The multi-stage retractable center tube hydraulic cylinder structure as claimed in claim 6, wherein the outer end of the piston rod (5) is provided with a second connecting portion (20) through which an external device can be connected via the second connecting portion (20).
8. The multi-stage center sleeve hydraulic cylinder structure capable of stepwise extension and retraction according to claim 1, wherein the length of the cylinder tube sleeve is longer than the length of the cylinder tube (7).
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113858000A (en) * | 2021-10-14 | 2021-12-31 | 福州天瑞线锯科技有限公司 | Single-drive composite grinding mechanism |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113858000A (en) * | 2021-10-14 | 2021-12-31 | 福州天瑞线锯科技有限公司 | Single-drive composite grinding mechanism |
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