CN113944673A - Low-cost multistage sleeve type hydraulic oil cylinder - Google Patents
Low-cost multistage sleeve type hydraulic oil cylinder Download PDFInfo
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- CN113944673A CN113944673A CN202111219433.2A CN202111219433A CN113944673A CN 113944673 A CN113944673 A CN 113944673A CN 202111219433 A CN202111219433 A CN 202111219433A CN 113944673 A CN113944673 A CN 113944673A
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- 239000010720 hydraulic oil Substances 0.000 title claims abstract description 22
- 238000009434 installation Methods 0.000 claims abstract description 16
- 238000007789 sealing Methods 0.000 claims abstract description 14
- 238000003466 welding Methods 0.000 claims abstract description 13
- 229910000831 Steel Inorganic materials 0.000 claims description 10
- 239000010959 steel Substances 0.000 claims description 10
- 239000000463 material Substances 0.000 abstract description 21
- 238000012545 processing Methods 0.000 abstract description 14
- 238000004519 manufacturing process Methods 0.000 abstract description 13
- 238000003754 machining Methods 0.000 description 6
- 239000002994 raw material Substances 0.000 description 6
- 230000000994 depressogenic effect Effects 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 230000005540 biological transmission Effects 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 230000003746 surface roughness Effects 0.000 description 3
- 230000006978 adaptation Effects 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 230000007123 defense Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000009102 absorption Effects 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000002860 competitive effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000029087 digestion Effects 0.000 description 1
- 238000005242 forging Methods 0.000 description 1
- 238000009499 grossing Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000004807 localization Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 230000036961 partial effect Effects 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
- F15B15/08—Characterised by the construction of the motor unit
- F15B15/14—Characterised by the construction of the motor unit of the straight-cylinder type
- F15B15/16—Characterised by the construction of the motor unit of the straight-cylinder type of the telescopic type
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
- F15B15/08—Characterised by the construction of the motor unit
- F15B15/14—Characterised by the construction of the motor unit of the straight-cylinder type
- F15B15/1423—Component parts; Constructional details
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
- F15B15/08—Characterised by the construction of the motor unit
- F15B15/14—Characterised by the construction of the motor unit of the straight-cylinder type
- F15B15/1423—Component parts; Constructional details
- F15B15/1428—Cylinders
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
- F15B15/08—Characterised by the construction of the motor unit
- F15B15/14—Characterised by the construction of the motor unit of the straight-cylinder type
- F15B15/1423—Component parts; Constructional details
- F15B15/1438—Cylinder to end cap assemblies
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
- F15B15/08—Characterised by the construction of the motor unit
- F15B15/14—Characterised by the construction of the motor unit of the straight-cylinder type
- F15B15/1423—Component parts; Constructional details
- F15B15/1438—Cylinder to end cap assemblies
- F15B15/1442—End cap sealings
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
- F15B15/08—Characterised by the construction of the motor unit
- F15B15/14—Characterised by the construction of the motor unit of the straight-cylinder type
- F15B15/1423—Component parts; Constructional details
- F15B15/1457—Piston rods
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
- F15B15/08—Characterised by the construction of the motor unit
- F15B15/14—Characterised by the construction of the motor unit of the straight-cylinder type
- F15B15/1423—Component parts; Constructional details
- F15B15/1471—Guiding means other than in the end cap
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Pistons, Piston Rings, And Cylinders (AREA)
- Actuator (AREA)
Abstract
The invention provides a low-cost multistage sleeve type hydraulic oil cylinder which comprises a cylinder barrel, wherein an installation position is arranged on the cylinder barrel; further comprising: the rear end cover is arranged at the bottom of the outer cylinder body to partially seal the mounting position; the boss is located on the installation position and is arranged close to the rear end cover, the boss is provided with a surfacing layer arranged along the radial direction of the piston rod, the surfacing layer is formed by surfacing welding of welding wires, and the length of the surfacing layer is not more than 6% of the total length of the cylinder barrel; the guide sleeve is inserted on the installation position along the axial direction of the piston rod and arranged away from the rear end cover so as to partially seal the installation position, and the guide sleeve is provided with support rings and sealing parts which are arranged at intervals. The invention solves the technical problems of high processing cost, low material utilization rate and low production efficiency of the hydraulic oil cylinder in the prior art.
Description
Technical Field
The invention relates to the technical field of hydraulic oil cylinders, in particular to a low-cost multistage sleeve type hydraulic oil cylinder.
Background
The hydraulic transmission is a transmission mode for energy conversion by utilizing hydraulic pressure energy, the position and the function of a main product hydraulic oil cylinder in national economy and national defense construction are very important, and the hydraulic transmission becomes one of the essential important means for realizing production process automation and improving labor productivity at present. The hydraulic industry in China begins in the last 50 th century, and products of the hydraulic industry are only used for machine tools and forging and pressing equipment at first and then used on tractors and engineering machinery; since some hydraulic element production technologies are introduced from abroad in the last 60 th century and hydraulic products are designed by oneself, hydraulic parts in China are widely used on various mechanical equipment; planned introduction, digestion, absorption and localization work of advanced hydraulic products and technologies are accelerated in the 80 s, so that the hydraulic technology in China gradually gets close to the world level in various aspects such as product quality, economic benefit, research and development and the like. Particularly, the basic product industry is supported by the nation in the last decade, the equipment level is continuously improved, and the products with complete varieties can be provided for automobiles, engineering machinery, agricultural machinery, machine tools, plastic machines, metallurgical mines, power generation equipment, railways, ships, light industry, electronics and national defense industry at present.
With the continuous development of hydraulic industry in China, the supply capacity of the industry is continuously enhanced, products are over-supplied and over-demanded, and the speed of hydraulic oil cylinder industry in China is increased and the footsteps are slowed down due to the influence of continuous improvement of product quality requirements of downstream demand markets. Therefore, higher requirements are provided for all aspects of the quality, the production efficiency, the production cost and the like of the hydraulic oil cylinder, in order to improve enterprise profits, the competitive advantage in the hydraulic oil cylinder industry is obtained, the product structure of the hydraulic oil cylinder is improved and optimized, technical innovation is enhanced, and the hydraulic oil cylinder becomes a necessary route in the existing hydraulic oil cylinder industry.
However, in order to ensure the height of the boss at the bottom of the cylinder body, the currently produced integral hydraulic cylinder needs to leave a 5 mm processing allowance on the outer circle of the cylinder barrel, which results in higher cost of raw materials, long processing time, and low material utilization rate and production efficiency.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a low-cost multistage sleeve type hydraulic oil cylinder, which solves the technical problems of high processing cost, low material utilization rate and low production efficiency in the prior art.
Therefore, the invention provides a low-cost multistage sleeve type hydraulic oil cylinder which comprises a cylinder barrel, wherein the cylinder barrel is provided with a piston rod, a secondary cylinder body, a primary cylinder body and an outer cylinder body which are sequentially sleeved, the piston rod is provided with an installation through hole, the outer cylinder body is provided with a hinge shaft, installation positions are arranged between the piston rod and the secondary cylinder body, between the secondary cylinder body and the primary cylinder body and between the primary cylinder body and the outer cylinder body, and the installation positions are arranged along the axial direction of the piston rod; further comprising:
the rear end cover is arranged at the bottom of the outer cylinder body to partially seal the mounting position;
the boss is located on the installation position and close to the rear end cover, the boss is fixedly connected with the corresponding piston rod, the second-stage cylinder body and the first-stage cylinder body, the boss is provided with a surfacing layer which is arranged along the radial direction of the piston rod, the surfacing layer is formed by adopting welding wire surfacing to thicken the piston rod, the second-stage cylinder body and the first-stage cylinder body, and the length of the surfacing layer is not more than 6% of the total length of the cylinder barrel;
the guide sleeve is inserted on the installation position along the axial direction of the piston rod and arranged away from the rear end cover so as to partially seal the installation position, and support rings and sealing parts which are arranged at intervals are arranged among the guide sleeve, the corresponding piston rod, the second-stage cylinder body and the first-stage cylinder body.
Compared with the prior art, the invention has the following beneficial effects:
firstly, in order to ensure the height of a boss at the bottom of the cylinder barrel, the boss is thickened in a build-up welding mode, and because the length of the boss is not more than 6% of the total length of the cylinder barrel, the build-up welding material can reduce the cost of raw materials and shorten the processing time, so that the material and the processing cost are effectively controlled, and the material utilization rate and the production efficiency are improved;
secondly, the T-shaped support ring for the hole originally installed at the bottom of the cylinder barrel is eliminated, the relative concentricity between the adjacent cylinder bodies is kept only by the support ring at the top, and the groove of the T-shaped support ring for the hole does not need to be machined at the bottom of the cylinder barrel while the T-shaped support ring for the hole is eliminated, so that the machining cost is reduced, the machining procedure is optimized, and the production efficiency is improved.
Preferably, the lengths of the piston rod, the secondary cylinder, the primary cylinder and the external cylinder are 410 mm to 470 mm;
the inner diameters of the secondary cylinder body, the primary cylinder body and the outer cylinder body are phi 60 mm-phi 100 mm.
Preferably, the second-stage cylinder body, the first-stage cylinder body and the outer cylinder body are made of 20# cold-drawn steel pipes.
Preferably, the rear end cap is close to one of one-level cylinder body is served and has circular recess, circular recess will the rear end cap is split into depressed part and smooth portion, the depressed part with the excircle diameter looks adaptation of one-level cylinder body, smooth portion with be located surfacing layer looks butt on the one-level cylinder body.
Preferably, the groove depth of the circular groove is 1.5 ± 0.1 mm.
Preferably, the guide sleeve is provided with an operation end and a closed end which are oppositely arranged, the operation end is divided into a first connecting part and a second connecting part which are integrated, the first connecting part is abutted against the corresponding secondary cylinder body, the primary cylinder body and the outer cylinder body, and the second connecting part is attached to the side wall of the corresponding piston rod, the corresponding secondary cylinder body, the corresponding primary cylinder body and the corresponding outer cylinder body and then extends into the corresponding mounting position.
Preferably, the number of the support rings is two, the number of the seals is three, and the support rings and the seals are arranged in a staggered mode.
Preferably, the inner surface of the guide sleeve has a first opening for receiving the support ring and a second opening for receiving the seal.
Preferably, the length of the guide sleeve is 95-105 mm;
the distance between the inner circle of the support ring and the outer circle of the support ring is 2.5 +/-0.1 mm, and the width of the support ring is 9.5 +/-0.1 mm.
Preferably, the piston rod, the secondary cylinder body and one end of the primary cylinder body, which is close to the boss, are all provided with positioning grooves.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is an enlarged view of a portion of FIG. 1 at A;
FIG. 3 is an enlarged view of a portion of FIG. 1 at B;
FIG. 4 is a schematic diagram of a portion of the present invention;
fig. 5 is a partial structural schematic diagram of a hydraulic oil cylinder in the prior art.
In the figure:
1. a cylinder barrel; 11. a piston rod; 12. a secondary cylinder body; 13. a primary cylinder body; 14. an outer cylinder body; 15. an installation position; 2. mounting a through hole; 3. a hinge shaft; 4. a rear end cap; 41. a circular groove; 42. a recessed portion; 43. a smoothing section; 5. a boss; 51. overlaying a welding layer; 6. a guide sleeve; 61. a working end; 611. a first connection portion; 612. a second connecting portion; 62. a closed end; 63. a first opening; 64. a second opening; 7. a support ring; 8. a seal member; 9. positioning a groove; 10. the holes are supported by a T-shaped support ring.
Detailed Description
It should be noted that, in the description of the present invention, unless otherwise explicitly specified or limited, the terms "disposed," "mounted," "connected," and the like are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
The invention will be further described with reference to the accompanying figures 1-4.
A low-cost multistage sleeve type hydraulic oil cylinder comprises a cylinder barrel 1, wherein the cylinder barrel 1 is provided with a piston rod 11, a secondary cylinder body 12, a primary cylinder body 13 and an outer cylinder body 14 which are sequentially sleeved from inside to outside, a mounting through hole 2 is formed in the piston rod 11, a hinge shaft 3 is arranged on the outer cylinder body 14, mounting positions 15 are arranged between the piston rod 11 and the secondary cylinder body 12, between the secondary cylinder body 12 and the primary cylinder body 13 and between the primary cylinder body 13 and the outer cylinder body 14, and the mounting positions 15 are arranged along the axial direction of the piston rod 11 (the above is the prior art, and detailed description is omitted); the hydraulic oil cylinder also comprises a rear end cover 4, a boss 5 and a guide sleeve 6;
the rear end cover 4 is covered at the bottom of the outer cylinder body 14 to partially seal the mounting position 15;
the boss 5 is located on the installation position 15 and close to the rear end cover 4 is arranged, the boss 5 is fixedly connected with the piston rod 11, the secondary cylinder body 12 and the primary cylinder body 13 correspondingly, the boss 5 is provided with a surfacing layer 51 which is arranged along the radial direction of the piston rod 11, the surfacing layer 51 is formed by adopting welding wire surfacing to thicken the piston rod 11, the secondary cylinder body 12 and the primary cylinder body 13, and the length of the surfacing layer 51 is not more than 6% of the total length of the cylinder barrel 1;
the guide sleeve 6 is inserted on the mounting position 15 along the axial direction of the piston rod 11 and arranged away from the rear end cover 4 to partially seal the mounting position 15, and support rings 7 and sealing parts 8 which are arranged at intervals are arranged between the guide sleeve 6 and the corresponding piston rod 11, the secondary cylinder 12 and the primary cylinder 13.
In the embodiment, in order to form a closed cavity at the installation position 15, a rear end cover 4 and a guide sleeve 6 are respectively added at two ends of the cylinder barrel 1, the rear end cover 4 is used for sealing the bottom of the cylinder barrel 1, the guide sleeve 6 is used for sealing the top of the cylinder barrel 1, and in addition, the guide sleeve 6 is sealed with a sealing piece 8 between the corresponding piston rod 11, the second-stage cylinder body 12 and the first-stage cylinder body 13, so that the tightness of the cylinder barrel 1 is increased; on the other hand, a support ring 7 at the bottom of the cylinder barrel 1 is eliminated (fig. 5 shows the structure of the cylinder barrel 1 in the prior art, wherein the bottom of the cylinder barrel 1 is provided with a T-shaped support ring 10 for a hole and a groove for accommodating the T-shaped support ring 10 for the hole), the support ring 7 is only arranged at the top of the cylinder barrel 1, and the support ring 7 at the top of the cylinder barrel 1 is used for keeping the relative concentricity between the adjacent cylinder bodies, so that the processing procedure of the groove and the assembly procedure of the T-shaped support ring 10 for the mounting hole are reduced, the production cost is reduced, and the production efficiency is improved; moreover, for guaranteeing 5 height of the boss of 1 bottom of cylinder barrel, the build-up welding layer 51 has on the boss 5, adopt the build-up welding mode to carry out the bodiness to it, so can simplify processing technology, need not to reserve the machining allowance in 1 excircle department of cylinder barrel, and the raw and other materials that the build-up welding mode used are the welding wire to simplified the course of working, reduced the cost of raw and other materials, meanwhile, the length of build-up welding layer 51 is no longer than 6% of 1 total length of cylinder barrel, further practiced thrift material and processing cost, improved production efficiency.
The lengths of the piston rod 11, the secondary cylinder 12, the primary cylinder 13 and the external cylinder 14 are 410 mm to 470 mm; the inner diameters of the secondary cylinder 12, the primary cylinder 13 and the outer cylinder 14 are phi 60mm to phi 100 mm.
In the present embodiment, the lengths of the outer cylinder 14, the primary cylinder 13, the secondary cylinder 12, and the piston rod 11 are 450 mm, 415 mm, 410 mm, and 470 mm, respectively, for example, and the inner diameters of the outer cylinder 14, the primary cylinder 13, and the secondary cylinder 12 are Φ 100 mm, Φ 80 mm, and Φ 60mm, for example.
The secondary cylinder 12, the primary cylinder 13 and the outer cylinder 14 are made of 20# cold-drawn steel pipes.
In the prior art, the cylinder barrel 1 is made of a 45# hot-rolled steel pipe, the surface roughness and the dimensional precision of the hot-rolled steel pipe are low, 3 mm machining allowance needs to be reserved for an inner circle and an outer circle, and the material cost and the machining cost are high. In the embodiment, the secondary cylinder body 12, the primary cylinder body 13 and the outer cylinder body 14 are made of 20# cold-drawn steel pipes, the strength of the materials is equivalent, but the surface roughness and the dimensional accuracy of the cold-drawn steel pipes are higher, and non-sealing surfaces between oil cylinder stages, namely inner holes of the cylinder barrel 1, can be directly used without being processed; therefore, the thickness of the raw material can be reduced, the thickness is changed from 8 mm to 6 mm, the weight of the material is reduced by 25%, the unit price cost of the material is increased by 20%, the material cost is actually saved by 10%, and meanwhile, the inner hole of the cylinder barrel 1 is not machined, so that the machining cost can be saved by 23%.
The rear end cap 4 is close to one of one-level cylinder body 13 is served and has circular recess 41, circular recess 41 will rear end cap 4 is split into depressed part 42 and smooth part 43, depressed part 42 with the excircle diameter looks adaptation of one-level cylinder body 13, smooth part 43 with be located surfacing layer 51 looks butt on the one-level cylinder body 13.
In this embodiment, in order to support and connect the primary cylinder 13, a circular groove 41 is provided at one end of the rear end cap 4 close to the primary cylinder 13, the circular groove 41 can divide the rear end cap 4 into a recessed portion 42 and a smooth portion 43, the diameter of the recessed portion 42 is the same as the outer diameter of the primary cylinder 13, and the smooth portion 43 abuts against the weld overlay 51, so that the effect of supporting the primary cylinder 13 can be achieved while the sealing effect is achieved, and the concentricity between the cylinders can be maintained.
The groove depth of the circular groove 41 is 1.5 +/-0.1 mm; in this embodiment, 1.5 mm is taken as an example.
The guide sleeve 6 has a working end 61 and a closed end 62 which are oppositely arranged, the working end 61 is divided into a first connecting portion 611 and a second connecting portion 612 which are integrated, the first connecting portion 611 is abutted with the corresponding secondary cylinder 12, the primary cylinder 13 and the external cylinder 14, and the second connecting portion 612 is attached to the side walls of the corresponding piston rod 11, the corresponding secondary cylinder 12, the corresponding primary cylinder 13 and the corresponding external cylinder 14 and then extends into the corresponding mounting position 15.
In this embodiment, in order to seal the installation positions 15 at various positions, the guide sleeve 6 is divided into the working end 61 and the closed end 62, wherein the working end 61 is divided into a first connecting portion 611 and a second connecting portion 612 from outside to inside, the first connecting portion 611 is used for abutting against the end portions of the corresponding secondary cylinder 12, primary cylinder 13 and outer cylinder 14, and the second connecting portion 612 is used for being inserted into the corresponding installation positions 15, so that a sealed cavity is formed.
The number of the support rings 7 is two, the number of the sealing elements 8 is three, and the support rings 7 and the sealing elements 8 are arranged in a staggered mode.
In the present embodiment, two support rings 7 and three seals 8 are arranged alternately in the direction from the rear end to the front end of the cylinder tube 1, the support rings 7 are used to reinforce the support fixation between the adjacent cylinders to keep the concentricity thereof, and the seals 8 are used to seal the gap therebetween.
The inner surface of the guide sleeve 6 has a first opening 63 for receiving the support ring 7 and a second opening 64 for receiving the seal 8. The addition of the first opening 63 and the second opening 64 can give way to the support ring 7 and the sealing member 8, so that the support ring 7 and the sealing member 8 can be attached to the outer surfaces of the corresponding primary cylinder 13, secondary cylinder 12 and piston rod 11.
The length of the guide sleeve 6 is 95-105 mm;
the distance between the inner circle of the support ring 7 and the outer circle of the support ring is 2.5 +/-0.1 mm, and the width of the support ring is 9.5 +/-0.1 mm.
In this embodiment, the lengths of the three guide sleeves 6 are, for example, 105 mm, 95 mm and 95 mm in the outward-inward direction; the distance between the inner circle of the support ring 7 and the outer circle thereof is 2.5 mm, and the width is 9.5 mm for example; in order to keep the relative concentricity of the adjacent cylinder bodies and improve the relative concentricity, compared with the traditional guide sleeve 6, the length of the guide sleeve 6 is increased, and meanwhile, the hole at the bottom of the cylinder barrel 1 can be replaced by the T-shaped support ring 10, so that the number of accessories is reduced, and the processing cost is reduced.
The piston rod 11, the secondary cylinder 12 and the primary cylinder 13 are provided with positioning grooves 9 at one end close to the boss 5.
In the embodiment, the raw material of the cylinder barrel 1 is changed into the 20# cold-drawn steel tube, the material strength is equivalent, but the surface roughness and the dimensional precision of the cold-drawn steel tube are higher, and the interstage non-sealing surface of the hydraulic oil cylinder, namely the inner hole of the cylinder barrel 1, can not be processed (because the inner hole of the cold-drawn steel tube can be directly used), so that the thickness of the raw material can be reduced, the original thickness of 8 mm is changed into 6 mm, the weight of the material is reduced by 25%, the unit price cost of the material is increased by 20%, the material cost is actually saved by 10%, and meanwhile, the inner hole of the cylinder barrel 1 is not processed, so that the processing cost can be saved by 23%; the bottom overlaying type cylinder barrel 1 with the relatively thin thickness is adopted, namely the overlaying layer 51 is additionally arranged at the boss 5 at the bottom of the cylinder barrel 1, the thickness of the raw material is reduced to 6 mm, in order to ensure the height of the boss 5 at the bottom of the cylinder barrel 1, the thickness is increased in an overlaying mode, the length of the overlaying layer 51 is only 20 mm and accounts for 6% of the total length of the cylinder barrel 1, the overlaying material cost and the processing time are short, the material and processing cost can be saved by 32%, and the material utilization rate and the production efficiency are improved; the T-shaped support ring 10 for the hole originally installed on the boss 5 at the bottom of the cylinder barrel 1 is omitted, the hydraulic oil cylinder is specially used for the hydraulic oil cylinder with small cylinder diameter and short stroke, relative concentricity between two cylinder bodies can be kept only by the support ring 7 at the top of the cylinder barrel 1 between the cylinder stages, the length of the guide sleeve 6 is increased for improving the relative concentricity of the cylinder barrel 1 between the stages, the distance between the support rings 7 is increased, the T-shaped support ring 10 for the hole is omitted, the boss 5 at the bottom of the cylinder barrel 1 does not need to be processed with a groove of the T-shaped support ring 10 for the hole, and therefore accessories can be saved and the processing cost is nearly 5%.
Finally, the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting, although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all of them should be covered in the claims of the present invention.
Claims (10)
1. A low-cost multistage sleeve type hydraulic oil cylinder comprises a cylinder barrel (1), wherein the cylinder barrel (1) is provided with a piston rod (11), a secondary cylinder body (12), a primary cylinder body (13) and an outer cylinder body (14) which are sequentially sleeved, a mounting through hole (2) is formed in the piston rod (11), a hinge shaft (3) is arranged on the outer cylinder body (14), mounting positions (15) are arranged between the piston rod (11) and the secondary cylinder body (12), between the secondary cylinder body (12) and the primary cylinder body (13) and between the primary cylinder body (13) and the outer cylinder body (14), and the mounting positions (15) are arranged along the axial direction of the piston rod (11); it is characterized by also comprising:
the rear end cover (4) is arranged at the bottom of the outer cylinder body (14) to partially seal the mounting position (15);
the cylinder barrel comprises a boss (5), the boss (5) is located on an installation position (15) and close to a rear end cover (4) in arrangement, the boss (5) corresponds to a piston rod (11), a secondary cylinder body (12) and a primary cylinder body (13) in fixed connection, the boss (5) is provided with a surfacing layer (51) arranged along the radial direction of the piston rod (11), the surfacing layer (51) is formed by surfacing welding wires so as to thicken the piston rod (11), the secondary cylinder body (12) and the primary cylinder body (13), and the length of the surfacing layer (51) is not more than 6% of the total length of the cylinder barrel (1);
the guide sleeve (6) is inserted into the mounting position (15) along the axial direction of the piston rod (11) and arranged away from the rear end cover (4) to partially seal the mounting position (15), and support rings (7) and sealing parts (8) which are arranged at intervals are arranged among the guide sleeve (6), the corresponding piston rod (11), the secondary cylinder body (12) and the primary cylinder body (13).
2. A low-cost, multi-stage telescopic hydraulic cylinder according to claim 1, wherein the length of said piston rod (11), said secondary cylinder (12), said primary cylinder (13) and said external cylinder (14) is between 410 mm and 470 mm;
the inner diameters of the secondary cylinder body (12), the primary cylinder body (13) and the outer cylinder body (14) are phi 60 mm-phi 100 mm.
3. A low cost multi-stage telescopic hydraulic ram according to claim 1 or 2, characterized in that said secondary cylinder (12), said primary cylinder (13) and said outer cylinder (14) are made of 20# cold drawn steel tube.
4. A low cost, multi-stage telescopic hydraulic ram according to claim 1, characterized in that said rear end cap (4) has a circular recess (41) on the end adjacent to said primary cylinder (13), said circular recess (41) dividing said rear end cap (4) into a recess (42) and a smooth portion (43), said recess (42) matching the outer diameter of said primary cylinder (13), said smooth portion (43) abutting a weld overlay (51) on said primary cylinder (13).
5. A low-cost multi-stage telescopic hydraulic cylinder according to claim 4, wherein said circular recesses (41) have a depth of 1.5 ± 0.1 mm.
6. A low cost multiple stage telescopic hydraulic ram according to claim 1, wherein said guide sleeve (6) has a working end (61) and a closed end (62) which are oppositely arranged, said working end (61) is divided into a first connecting portion (611) and a second connecting portion (612), said first connecting portion (611) is abutted with the corresponding said secondary cylinder (12), said primary cylinder (13) and said external cylinder (14), said second connecting portion (612) is abutted with the side wall of the corresponding said piston rod (11), said secondary cylinder (12), said primary cylinder (13) and said external cylinder (14) and then extends into the corresponding said mounting position (15).
7. A low cost, multi-stage telescopic hydraulic ram according to claim 1, characterized in that said support rings (7) are two in number and said seals (8) are three in number, said support rings (7) and said seals (8) being staggered.
8. A low cost multi-stage telescopic hydraulic ram according to claim 7, characterized in that the inner surface of said guide sleeve (6) has a first opening (63) for receiving said support ring (7) and a second opening (64) for receiving said seal (8).
9. A low-cost multi-stage telescopic hydraulic cylinder according to any one of claims 1 to 2 or 4 to 8, wherein said guide sleeves (6) have a length of 95 mm to 105 mm;
the distance between the inner circle of the support ring (7) and the outer circle of the support ring is 2.5 +/-0.1 mm, and the width of the support ring is 9.5 +/-0.1 mm.
10. A low cost, multi-stage telescopic hydraulic ram according to claim 1, characterized in that said piston rod (11), said secondary cylinder (12) and said primary cylinder (13) have locating slots (9) at the ends adjacent to said boss (5).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111219433.2A CN113944673A (en) | 2021-10-20 | 2021-10-20 | Low-cost multistage sleeve type hydraulic oil cylinder |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111219433.2A CN113944673A (en) | 2021-10-20 | 2021-10-20 | Low-cost multistage sleeve type hydraulic oil cylinder |
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| CN113944673A true CN113944673A (en) | 2022-01-18 |
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| CN202111219433.2A Pending CN113944673A (en) | 2021-10-20 | 2021-10-20 | Low-cost multistage sleeve type hydraulic oil cylinder |
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|---|---|---|---|---|
| FR2259296A1 (en) * | 1974-01-29 | 1975-08-22 | Protomatic | Telescopic hydraulic jack made from standard tubes - has cold worked varying thickness tubes and standard sealing rings |
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| CN204664046U (en) * | 2015-05-07 | 2015-09-23 | 泸州市长江液压件装备有限公司 | A kind of compression type environmental sanitation boats and ships Double Acting Telescopic Hydraulic Cylinder |
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2021
- 2021-10-20 CN CN202111219433.2A patent/CN113944673A/en active Pending
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| FR2259296A1 (en) * | 1974-01-29 | 1975-08-22 | Protomatic | Telescopic hydraulic jack made from standard tubes - has cold worked varying thickness tubes and standard sealing rings |
| CN201071855Y (en) * | 2007-06-20 | 2008-06-11 | 成都市新津光辉机械实业有限公司 | Multilevel sleeve type hydraulic oil cylinder |
| CN204664046U (en) * | 2015-05-07 | 2015-09-23 | 泸州市长江液压件装备有限公司 | A kind of compression type environmental sanitation boats and ships Double Acting Telescopic Hydraulic Cylinder |
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