CN220286098U

CN220286098U - Double-piston-rod synchronous-extending long-stroke hydraulic cylinder

Info

Publication number: CN220286098U
Application number: CN202321540118.4U
Authority: CN
Inventors: 刘梅红; 张记超; 朱安贺; 唐佳佳
Original assignee: Xuzhou XCMG Hydraulics Co Ltd
Current assignee: Xuzhou XCMG Hydraulics Co Ltd
Priority date: 2023-06-16
Filing date: 2023-06-16
Publication date: 2024-01-02
Anticipated expiration: 2033-06-16

Abstract

The utility model discloses a long-stroke hydraulic cylinder with double piston rods extending synchronously, which comprises a large bidirectional integrated cylinder barrel formed by fixing two independent and coaxially arranged cylinder barrels through an intermediate connecting body, and a set of in-cylinder components consisting of a piston, a piston rod and a guide sleeve are respectively arranged in the two cylinder barrels; the piston rods of the two cylinders and the middle connecting body are of hollow structures, so that an oil cavity which is communicated with each other is formed in the large bidirectional integrated cylinder, after oil injection and pressure boosting, the piston rods on two sides synchronously extend outwards relative to the cylinder, and after the piston rods extend, the piston rods are locked through the arranged hydraulic valve group. Because the inner cavities of the two piston rods are provided with oil pressure, the thrust of the inner cavities of the piston rods directly acts on the connecting end parts of the piston rod earrings, the integral rigidity of the piston rods is increased, meanwhile, the end parts of the piston rods only bear the thrust of the annular area of the piston rods, the stress of the end surfaces of the piston rods is reduced, and the stability of the piston rod pressing rods is improved.

Description

Double-piston-rod synchronous-extending long-stroke hydraulic cylinder

Technical Field

The utility model relates to a long-stroke hydraulic cylinder with double piston rods extending synchronously, and belongs to the technical field of hydraulic cylinders.

Background

The hydraulic cylinder is a pressure-driven actuator that converts hydraulic energy into mechanical energy.

The existing ultra-long stroke hydraulic cylinder is mainly installed in a long cylinder barrel through a long piston rod, the installation space of the hydraulic cylinder is large, the total extension stability of a piston rod is low, the length of the ultra-long stroke hydraulic cylinder barrel rod is large, special customization is needed for the length of raw materials, the requirement on the processing capacity of processing and manufacturing equipment is high, the processing difficulty is large, and the production cost is high.

The left and right sides of the interior of the existing double-piston-rod hydraulic cylinder body respectively form a hydraulic cylinder with an oil port, a piston rod can only extend to one direction, the extension of the piston rod can only realize half stroke of the length of the piston rod, the use of the hydraulic cylinder is limited to a short-stroke hydraulic cylinder, a relatively large arrangement installation space is required, under the condition that the arrangement space is limited, the condition that the hydraulic cylinder cannot be implemented possibly exists, the hydraulic cylinder is difficult to process, and the material utilization rate is relatively high.

Disclosure of Invention

The utility model aims to overcome the defects and provide the ultra-long-stroke double-piston rod type hydraulic cylinder which has high stability, high overall reliability, low requirements on raw materials and processing equipment, namely, can be processed and manufactured by common equipment. The hydraulic cylinder is welded into a whole after being independently machined by the two cylinders, and the two piston rods are matched with the piston and the guide sleeve to be connected at the two ends of the cylinder after being independently machined and manufactured.

The utility model is realized according to the following technical scheme:

a long-stroke hydraulic cylinder with synchronously extending double piston rods comprises a large bidirectional integrated cylinder barrel formed by fixing two independent and coaxially arranged cylinder barrels through an intermediate connecting body, and a set of in-cylinder components consisting of a piston, a piston rod and a guide sleeve are respectively arranged in the two cylinder barrels; the piston rods of the two cylinders and the middle connecting body are of hollow structures, so that an oil cavity which is communicated with each other is formed in the large bidirectional integrated cylinder, after oil injection and pressure boosting, the piston rods on two sides synchronously extend outwards relative to the cylinder, and after the piston rods extend, the piston rods are locked through the arranged hydraulic valve group.

In some embodiments, the guide sleeve is slidably fitted over the piston rod and secured to the cylinder at the end adjacent the outside atmosphere by an axial screw.

In some embodiments, the piston rod is sleeved with a piston at the end near the intermediate connector, and the position of the piston is limited by a limiting component.

In some embodiments, the spacing member comprises:

the spacer bush is arranged between the piston and the step on the piston rod;

the lock nut is screwed on the end part of the piston rod and is used for propping up the piston and the spacer bush;

the anti-loose jackscrew is screwed on the piston rod after penetrating into the lock nut in the radial direction.

In some embodiments, a gap is reserved between the outer circumferential surfaces of the spacer bush and the lock nut and the inner wall of the cylinder barrel; the piston is provided with an oil through hole which penetrates through the axial direction, and the spacer bush, the lock nut and the piston are provided with an oil passing step lower than the bottom diameter of the oil through hole on the end face of the spacer bush, the lock nut and the piston, so that the oil pressure on two sides of the piston can be balanced rapidly.

In some embodiments, the end of the piston rod outside the cylinder is provided with an ear ring for connection to a structural member of the host machine.

In some embodiments, the hydraulic valve group is installed on any earring, the hydraulic valve group is a check valve group, the check valve group is composed of a check valve and an overflow valve, hydraulic oil enters the cylinder barrel through the check valve group, and the piston rod after extending out maintains pressure through the check valve group.

In some embodiments, the earring is provided with an auxiliary pressure measuring port for detecting the oil pressure inside the cylinder barrel.

In some embodiments, the guide sleeve and the cylinder barrel are provided with an exhaust pressure measuring channel, and an exhaust side pressure connector is arranged at the outlet of the exhaust pressure measuring channel on the guide sleeve.

In some embodiments, the outer peripheral surface of the bidirectional integrated large cylinder is sleeved with a sliding supporting ring, and the sliding supporting ring is hooped by a clamp arranged on the host structural member to complete the connection of the bidirectional integrated large cylinder and the host structural member.

In some embodiments, the middle connector is provided with an elongated spigot matched with the cylinder barrels at two sides, and the elongated spigot is in transition fit with the cylinder barrels.

Compared with the prior art, the utility model has the beneficial effects that:

1) The double piston rods extend out simultaneously, a sliding supporting ring is arranged between the cylinder barrel and the main machine structural part, and the stability is high;

2) The structure is compact, the stroke is long, and the hydraulic cylinder structure can be used for hydraulic cylinder structural members with compact main machine space and high stroke requirement;

3) Because the inner cavities of the two piston rods are propped, the bearing capacity of the two piston rods is propped against the end of the earring, the thrust at the two ends directly acts on the outer end parts of the piston rods, and the end surfaces of the piston rods only bear the thrust of the annular area of the piston rods, the stress of the end surfaces of the piston rods is reduced, and the stability of the piston rods is improved;

4) The raw material length requirements of the hydraulic cylinder body and the piston rod with the same stroke are reduced by half, the workability and the manufacturability of the hydraulic cylinder with the long stroke are improved, special custom materials are not needed, and the production cost is reduced.

Drawings

The accompanying drawings, which are included to provide a further understanding of the utility model and are incorporated in and constitute a part of this specification, illustrate embodiments of the utility model and together with the description serve to explain the utility model. It is evident that the drawings in the following description are only examples, from which other drawings can be obtained by a person skilled in the art without the inventive effort.

In the drawings:

FIG. 1 is a cross-sectional view of the overall construction of a long stroke hydraulic cylinder of the present utility model;

FIG. 2 is an enlarged view of a portion of FIG. 1;

fig. 3 is a schematic diagram of a hydraulic lock of the present utility model.

The attached drawings are identified: 1. the device comprises a one-way valve group, a 2 piston rod I, a 3 exhaust pressure measuring connector I, a 4 guide sleeve I, a 5 cylinder I, a 6 spacer sleeve I, a 7 piston I, an 8 locking nut I, a 9 locking jackscrew I, a 10 intermediate connector, an 11 locking jackscrew II, a 12 locking nut II, a 13 piston II, a 14 cylinder II, a 15 spacer sleeve II, a 16 guide sleeve II, a 17 exhaust pressure measuring connector II, a 18 piston rod II, 19, an auxiliary pressure measuring port, 20 and a sliding supporting ring.

It should be noted that these drawings and the written description are not intended to limit the scope of the inventive concept in any way, but to illustrate the inventive concept to those skilled in the art by referring to the specific embodiments.

Description of the embodiments

For the purpose of making the objects, technical solutions and advantages of the embodiments of the present utility model more apparent, the technical solutions in the embodiments will be clearly and completely described with reference to the accompanying drawings in the embodiments of the present utility model, and the following embodiments are used to illustrate the present utility model, but are not intended to limit the scope of the present utility model.

In the description of the present utility model, it should be noted that the directions or positional relationships indicated by the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model.

In the description of the present utility model, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.

As shown in fig. 1, a long-stroke hydraulic cylinder with synchronously extending double piston rods comprises a large bidirectional integrated cylinder barrel formed by fixing two independent and coaxially arranged cylinder barrels through an intermediate connecting body 10, and a set of in-cylinder components consisting of a piston, a piston rod and a guide sleeve are respectively arranged in the two cylinder barrels; the piston rod I2 in the cylinder barrel I5, the piston rod II 18 in the cylinder barrel II 14 and the intermediate connecting body are hollow structures, so that an oil cavity communicated with each other is formed in the bidirectional integrated large cylinder barrel, a hydraulic valve group is arranged at the earring end of the piston rod I2, the earring ends of the piston rod I2 and the piston rod II 18 are connected with a main machine structural member through a pin shaft, and a sliding supporting ring for improving the stability of the whole cylinder is arranged between the cylinder barrel and the main machine structural member; hydraulic oil flows into the inner cavity of the cylinder barrel and the inner cavity of the piston rod II 18 through an oil way in the inner cavity of the piston rod I2 through an oil port of the hydraulic valve group, and after the hydraulic oil is boosted, the piston rod I2 and the piston rod II 18 synchronously extend outwards relative to the cylinder barrel, so that the oil cylinder can quickly drive a main motor-driven structural member to move upwards to a set position, and after the piston rod extends out, the hydraulic valve group is locked. According to the utility model, the problem that the stability is poor because a single piston rod of a long-stroke hydraulic cylinder stretches out too much is solved, the phenomenon of instability of the hydraulic cylinder with high single rod stretching-out speed is reduced because the double rods stretch out simultaneously, meanwhile, because the inner cavities of the two piston rods are provided with oil pressure, the thrust of the inner cavities of the piston rods directly acts on the connecting end parts of the piston rod earrings, the integral rigidity of the piston rod is increased, meanwhile, the end parts of the piston rod only bear the thrust of the annular area of the piston rod, the stress of the end face of the piston rod is reduced, and the stability of the piston rod pressing rod is improved.

With continued reference to FIG. 1, the guide sleeve I4 is slidably sleeved on the piston rod I2 and is fixed to the end of the cylinder barrel I5 near the outside atmosphere by an axial screw; the guide sleeve II 16 is slidably sleeved on the piston rod II 18 and is fixed to the end of the cylinder barrel II 14 close to the outside atmosphere by an axial screw.

The piston rod I2 is sleeved with a piston I7 at the end close to the intermediate connector 10, a spacer I6 is arranged between the piston I7 and a step on the piston rod I2, and a lock nut I8 is screwed at the end of the piston rod I2 and used for propping up the piston I7 and the spacer I6; the anti-loose jackscrew I9 radially penetrates into the locking nut I8 and then is screwed on the piston rod I2. The piston rod II 18 is sleeved with a piston II 13 at the end close to the intermediate connector 10, a spacer II 15 is arranged between the piston II 13 and a step on the piston rod II 18, and a lock nut II 12 is screwed at the end of the piston rod II 18 and used for propping up the piston II 13 and the spacer II 15; the anti-loose jackscrew II 11 radially penetrates into the lock nut II 12 and then is screwed on the piston rod II 18.

As shown in FIG. 2, gaps are reserved between the outer circumferential surfaces of the spacer bush I6 and the lock nut I8 and the inner wall of the cylinder barrel I5; the piston I7 is provided with an oil hole penetrating axially, and the matching end surfaces of the spacer bush I6, the lock nut I8 and the piston I7 are provided with an oil passing step lower than the bottom diameter of the oil hole, so that the oil pressure on two sides of the piston I7 is balanced rapidly. Of course, the structure of the piston II 13 in the cylinder II 14 is the same as described above.

As shown in fig. 3, the hydraulic valve group is a check valve group 1, the check valve group 1 is composed of a check valve and an overflow valve, hydraulic oil enters the cylinder barrel through the check valve group 1, and the piston rod after extending out maintains pressure through the check valve group 1.

With continued reference to fig. 1, the ear ring is provided with an auxiliary pressure measuring port 19 for detecting the oil pressure inside the cylinder.

With continued reference to fig. 1, the guide sleeve i 4 and the cylinder barrel i 5 are provided with an exhaust pressure measuring channel, and an exhaust side pressure joint i 3 is installed at the outlet of the exhaust pressure measuring channel on the guide sleeve i 4. The guide sleeve II 16 and the cylinder barrel II 14 are internally provided with an exhaust pressure measuring channel, and an exhaust side pressure joint II 17 is arranged at the outlet of the exhaust pressure measuring channel on the guide sleeve II 16.

With continued reference to fig. 1, the outer peripheral surface of the bidirectional integrated large cylinder is sleeved with a sliding supporting ring 20, and the sliding supporting ring 20 is hooped by a clamp installed on a host structural member to complete connection of the bidirectional integrated large cylinder and the host structural member.

With continued reference to fig. 1, the intermediate connector 10 is provided with an elongated spigot that mates with the cylinder on both sides, and the elongated spigot mates with the cylinder in a transition manner.

The working principle and the implementation scheme are as follows: system hydraulic oil passes through the check valve hydraulic fluid port and gets into the pneumatic cylinder, check valve 1 is equipped with check valve and overflow valve, check valve control port direct connection system, hydraulic oil passes through check valve 1 and gets into cylinder I5, then promote piston rod I2 and piston rod II 18 outwards stretch out simultaneously after getting into cylinder II 14 through the intermediate junction body, at this moment, the super long stroke pneumatic cylinder of stroke behind cylinder I5 stroke and the combination of cylinder II 14 stroke, carry out the pressurize through check valve 1, when both sides piston rod need withdraw, system oil pressure gets into check valve control port and opens the check valve, the piston rod of both sides is retrieved under host computer structure dead weight pressure to the piston rod, the check valve is equipped with the overload protection that the hydraulic cylinder was realized to the overflow valve.

On the whole, the double piston rods extend out simultaneously, and a sliding supporting ring is arranged between the cylinder barrel and a main machine structural member, so that the stability is high; the structure is compact, the stroke is long, and the hydraulic cylinder structure can be used for hydraulic cylinder structural members with compact main machine space and high stroke requirement; because the inner cavities of the two piston rods are propped, the bearing capacity of the two piston rods is propped against the end of the earring, the thrust at the two ends directly acts on the outer end parts of the piston rods, and the end surfaces of the piston rods only bear the thrust of the annular area of the piston rods, the stress of the end surfaces of the piston rods is reduced, and the stability of the piston rods is improved; the raw material length requirements of the hydraulic cylinder body and the piston rod with the same stroke are reduced by half, the workability and the manufacturability of the hydraulic cylinder with the long stroke are improved, special custom materials are not needed, and the production cost is reduced.

In the description provided herein, numerous specific details are set forth. However, it is understood that embodiments of the utility model may be practiced without these specific details. In some instances, well-known methods, structures and techniques have not been shown in detail in order not to obscure an understanding of this description.

Furthermore, those skilled in the art will appreciate that while some embodiments described herein include some features contained in other embodiments, but not others, combinations of features of different embodiments are equally meant to be within the scope of the utility model and form different embodiments. For example, in the above embodiments, those skilled in the art can use the above embodiments in combination according to known technical solutions and technical problems to be solved by the present application.

The foregoing description is only illustrative of the preferred embodiment of the present utility model, and is not to be construed as limiting the utility model, but is to be construed as limiting the utility model to any simple modification, equivalent variation and variation of the above embodiments according to the technical matter of the present utility model without departing from the scope of the utility model.

Claims

1. The utility model provides a long stroke pneumatic cylinder that two piston rods stretch out in step which characterized in that:

the device comprises a large bidirectional integrated cylinder barrel which is formed by fixing two independent and coaxially arranged cylinder barrels through an intermediate connector, and a set of in-cylinder assembly which consists of a piston, a piston rod and a guide sleeve is respectively arranged in the two cylinder barrels;

the piston rods of the two cylinders and the middle connecting body are of hollow structures, so that an oil cavity which is communicated with each other is formed in the large bidirectional integrated cylinder, after oil injection and pressure boosting, the piston rods on two sides synchronously extend outwards relative to the cylinder, and after the piston rods extend, the piston rods are locked through the arranged hydraulic valve group.

2. The dual piston rod synchronous extension long travel hydraulic cylinder of claim 1 wherein: the guide sleeve is sleeved on the piston rod in a sliding manner and is fixed at one end of the cylinder barrel, which is close to the outside atmosphere, through an axial screw.

3. The dual piston rod synchronous extension long travel hydraulic cylinder of claim 1 wherein: the piston rod is sleeved with a piston at the end close to the middle connector, and the position of the piston is limited by the limiting component.

4. A dual piston rod synchronous extension long travel hydraulic cylinder as defined in claim 3 wherein the limiting member comprises:

the spacer bush is arranged between the piston and the step on the piston rod;

5. The dual piston rod synchronous extension long travel hydraulic cylinder of claim 4 wherein: gaps are reserved between the outer circumferential surfaces of the spacer bush and the lock nut and the inner wall of the cylinder barrel;

the piston is provided with an oil through hole which penetrates through the axial direction, and the spacer bush, the lock nut and the piston are provided with an oil passing step lower than the bottom diameter of the oil through hole on the end face of the spacer bush, the lock nut and the piston, so that the oil pressure on two sides of the piston can be balanced rapidly.

6. The dual piston rod synchronous extension long travel hydraulic cylinder of claim 1 wherein: the end part of the piston rod positioned outside the cylinder barrel is provided with an earring which is used for being connected with a main machine structural part.

7. The dual piston rod synchronous extension long travel hydraulic cylinder of claim 6 wherein: the hydraulic valve group is arranged on any one of the earrings, the hydraulic valve group is a one-way valve group, the one-way valve group consists of a one-way valve and an overflow valve, hydraulic oil enters the cylinder barrel through the one-way valve group, and a piston rod after extending out maintains pressure through the one-way valve group.

8. The dual piston rod synchronous extension long travel hydraulic cylinder of claim 6 wherein: the earrings are provided with auxiliary pressure measuring ports for detecting the oil pressure in the cylinder barrel.

9. The dual piston rod synchronous extension long travel hydraulic cylinder of claim 1 wherein: the guide sleeve and the cylinder barrel are provided with an exhaust pressure measuring channel, and an exhaust side pressure connector is arranged at the outlet of the exhaust pressure measuring channel on the guide sleeve.

10. The dual piston rod synchronous extension long travel hydraulic cylinder of claim 1 wherein: the outer peripheral surface of the bidirectional integrated large cylinder barrel is sleeved with a sliding supporting ring, and the sliding supporting ring is hooped by a clamp arranged on a host structural member to complete connection of the bidirectional integrated large cylinder barrel and the host structural member.

11. The dual piston rod synchronous extension long travel hydraulic cylinder of claim 1 wherein: the middle connector is provided with an elongated spigot matched with the cylinder barrels on two sides, and the elongated spigot is in transition fit with the cylinder barrels.