CN218093714U - Hydraulic oil cylinder, hydraulic device and vehicle-carrying platform - Google Patents
Hydraulic oil cylinder, hydraulic device and vehicle-carrying platform Download PDFInfo
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- CN218093714U CN218093714U CN202221694542.XU CN202221694542U CN218093714U CN 218093714 U CN218093714 U CN 218093714U CN 202221694542 U CN202221694542 U CN 202221694542U CN 218093714 U CN218093714 U CN 218093714U
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Abstract
The utility model discloses a hydraulic cylinder, hydraulic means and carry car platform, hydraulic cylinder includes two at least piston assembly, piston assembly includes base and piston rod, be equipped with the hydraulic pressure chamber in the base, the hydraulic pressure chamber is located to the piston rod cunning, hydraulic cylinder is established along the first direction cover by two at least piston assembly in proper order, the circulation cavity of the piston assembly of adjacent last one-level and the bottom cavity intercommunication and the inside of the piston assembly of next-level all are full of hydraulic oil, the bottom cavity along the first order of first direction is used for being connected with the hydraulic pressure station through locating the business turn over hydraulic fluid port on the base, through the flexible slip of piston rod to the first direction of the at least second grade of business turn over oil in order to drive. The hydraulic oil cylinder is characterized in that a plurality of piston assemblies are sequentially sleeved, a piston rod of the upper stage forms a base of the lower stage, and a multi-stage telescopic mechanism is formed by parity of reasoning, so that the extension length of the piston rod at the tail end relative to the base of the first stage can be increased.
Description
Technical Field
The utility model relates to a hydraulic cylinder, hydraulic means and carry car platform.
Background
At present, hydraulic oil cylinders generally have two modes in order to realize large telescopic stroke. In the first mode, the telescopic stroke of the piston rod in the oil cylinder is increased so as to increase the lifting amount of the piston rod. In the second mode, a plurality of sections of hydraulic oil cylinders which are extended and retracted step by step in one direction are combined, and the large stroke ratio is realized by extending and retracting and overlapping piston rods of all the sections. In the second mode, a plurality of sections of oil cylinders are extended and contracted step by step in a one-way mode, the upper oil cylinder is communicated with the lower oil cylinder, the cross sectional area of the upper hydraulic cylinder is larger than that of the lower oil cylinder, the extension and contraction speed of the lower oil cylinder is higher than that of the upper oil cylinder at the same oil injection speed, and the stability of the extension and contraction speed is difficult to control. However, these two hydraulic cylinders have many parts and large volumes, and have low expansion efficiency, and it is difficult to achieve rapid and stable expansion.
SUMMERY OF THE UTILITY MODEL
The to-be-solved technical problem of the utility model is to set up complicacy and flexible inefficiency in order to overcome the multi-stage cylinder among the prior art, is difficult to realize quick stable's flexible defect, provides a hydraulic cylinder, hydraulic means and carries vehicle platform.
The utility model discloses an above-mentioned technical problem is solved through following technical scheme:
the utility model provides a hydraulic cylinder, its includes two at least piston assembly, piston assembly includes base and piston rod, wherein, along the first direction, adjacent last one-level the piston rod forms one-level down the base, be equipped with the hydraulic pressure chamber in the base, the piston rod slides and locates the hydraulic pressure chamber, and will bottom cavity and circulation cavity are separated into to the hydraulic pressure chamber, hydraulic cylinder is by at least two piston assembly overlaps in proper order along the first direction and establishes, adjacent last one-level piston assembly's circulation cavity and next-level piston assembly's bottom cavity intercommunication and inside all are full of hydraulic oil, follow the bottom cavity of first level is through locating business turn over hydraulic fluid port on the base is used for being connected with the hydraulic pressure station, through business turn over oil in order to drive at least second level the piston rod slides to the first direction is flexible.
In this scheme, this hydraulic cylinder establishes a plurality of piston assembly cover in proper order for the piston rod of last one-level forms the base of one-level down, analogizes and forms multistage telescopic machanism with this, and the extension length of multiplicable terminal piston rod for the base of first order compares with the hydraulic cylinder that multistage set up alone, reduces hydraulic cylinder's part setting, simplifies hydraulic cylinder's structure from this. After the bottom cavity of the first-stage piston assembly is filled with hydraulic oil, the piston rod of the first stage slides in the direction far away from the base, the circulation cavity of the first stage is reduced, the hydraulic oil of the circulation cavity is pressed into the bottom cavity of the next piston assembly, and the like, the hydraulic oil in the bottom cavity of the tail end pushes the piston rod of the tail end to slide in the direction far away from the base, so that the extension of the piston rod of the multi-stage piston rod relative to the base is realized, and the piston rod stroke of the hydraulic oil cylinder is increased. And the drive power of the hydraulic oil cylinder only fills oil into the bottom cavity of the first stage for the hydraulic station, so that the synchronous extension and retraction of the piston rods of all stages can be realized in order to keep the pressure balance in the hydraulic cavity, and the piston rods are high in extension and retraction speed and stable in operation.
Preferably, the cross-sectional area of the circulation cavity of the adjacent upper stage is not smaller than that of the bottom cavity of the piston assembly of the adjacent lower stage.
In this scheme, adopt above-mentioned structure to set up, prevent to circulate in the cavity because do not have hydraulic oil to fill the bottom cavity, lead to the piston rod not to slide to maximum stroke department, and then influence hydraulic cylinder's the volume that stretches out.
Preferably, the cross-sectional area of the circulation chamber of the adjacent upper stage is equal to the cross-sectional area of the bottom chamber of the piston assembly of the adjacent lower stage.
In this scheme, adopt above-mentioned structure setting, the equivalent relation between circulation cavity and the bottom cavity, hydraulic oil makes a round trip to flow between circulation cavity and bottom cavity to furthest utilizes the space between two cavities, makes the maximum stroke that the volume of stretching out and the shrinkage of piston rod are all in equal volume, uses the base of first order as the starting point, and the volume of stretching out of terminal piston rod is the integral multiple of the volume of stretching out of first order piston rod.
Preferably, one end of the piston rod close to the bottom cavity is a piston portion, one end of the piston rod far away from the bottom cavity is a rod body, the piston portion is in sliding fit in the base, the piston portion drives an adjacent next stage to telescopically slide towards a first direction through oil inlet and outlet in the bottom cavity of a previous stage, the bottom cavity of the piston assembly is provided with an adjacent next stage in the rod body, and the circulating cavity is a cavity defined by the outer wall of the rod body, the piston portion and the inner wall of the base.
In this scheme, adopt above-mentioned structure setting, the inner space of make full use of piston rod forms the bottom cavity to the piston rod still encloses into the circulation cavity with the inner wall of the base of last level, makes the piston rod have the dual identity of the piston rod of last level and the base of next level, has improved the inner space utilization efficiency of piston rod.
Preferably, the cavity of the base is cylindrical, the bottom cavity in the rod body is cylindrical, the radius of the peripheral cross section of the piston portion is equal to the radius of the cross section of the inner wall of the cavity of the base, the radius of the cross section of the rod body is smaller than the radius of the cross section of the base, and the circulating cavity is a cavity defined by the circumferential outer wall of the rod body, the piston portion and the inner wall of the base.
In this scheme, adopt above-mentioned structural setting, the piston portion of the piston rod of being convenient for is in the same direction as smooth slip in the cavity of base, prevents the jamming.
Preferably, the circulation cavity of the piston assembly at the upper stage along the first direction is communicated with the bottom cavity of the piston assembly at the lower stage through a through hole on the wall surface of the base of the piston assembly at the lower stage.
In this scheme, adopt above-mentioned structure setting, the circulation cavity of being convenient for and bottom cavity intercommunication simplify the structure setting, and can not lead to the fact the influence to the sealing performance between the cavity.
Preferably, the through hole is disposed near the piston portion of the piston rod.
In this scheme, adopt above-mentioned structure setting, when the piston rod slided to the bottom of bottom cavity, the via hole can not blockked up to the flexible stroke of increase piston rod by piston portion.
Preferably, the number of the through holes is at least two, and the at least two through holes are uniformly arranged on the base at intervals along the circumferential direction of the hydraulic oil cylinder.
In this scheme, adopt above-mentioned structure setting, the hydraulic oil of being convenient for evenly just makes a round trip to flow fast between circulation cavity and bottom cavity, makes the atress of piston rod balanced, increases the gliding stationarity of piston rod.
Preferably, the number of the piston assemblies is two.
In this scheme, adopt above-mentioned structural setting, use the base of first order as the starting point, the amount that stretches out of terminal piston rod is the twice of the amount that stretches out of first order piston rod.
Preferably, the hydraulic oil cylinder further comprises a control valve, and the control valve is mounted on the oil inlet and outlet and used for opening or closing the oil inlet and outlet.
In this scheme, adopt above-mentioned structural arrangement, when the control valve closed, make the piston rod keep a certain supporting position. When the control valve is opened, the piston rod is stretched by injecting oil or discharging oil into the bottom cavity of the first stage.
The hydraulic device comprises the hydraulic oil cylinder, the hydraulic servo motor, the oil storage cylinder and the hydraulic pipe, wherein the oil inlet and the oil outlet are connected to the oil storage cylinder through the hydraulic pipe, and the hydraulic servo motor is arranged on the hydraulic pipe and used for injecting oil into the bottom cavity or pumping the oil in the bottom cavity out to the oil storage cylinder.
In this scheme, adopt above-mentioned structure setting, hydraulic servo motor corotation, hydraulic pressure station begins to work and supplies oil in giving the bottom cavity of first order, the piston rod of the first order of fluid jacking stretches out, will circulate the hydraulic oil extrusion in the cavity when the piston rod of first order stretches out, make it get into in the bottom cavity of next piston assembly, analogize with this, in the bottom cavity of the first order is constantly poured into to hydraulic oil, multistage piston rod is homogeneous-synchronization flexible, make the whole stroke of the terminal piston rod of hydraulic cylinder grow and reach jacking platform purpose. The hydraulic servo motor rotates reversely, hydraulic oil in the bottom cavity of the first stage is pumped out, and under the action of the gravity and the atmospheric pressure of the loaded piston rod, the hydraulic oil in the bottom cavities of all stages flows back to the circulating cavity except the bottom cavity of the first stage, so that all stages of piston rods are retracted into the base.
Preferably, the hydraulic station further comprises a solenoid valve installed at the hydraulic pipe for opening or closing the hydraulic pipe.
In this scheme, adopt above-mentioned structure setting, the solenoid valve is the on-off valve, and can receive the control of intelligent control board for open or close hydraulic pressure pipe, realize hydraulic means's automatic control.
A vehicle-carrying platform comprises a platform body and the hydraulic oil cylinder or the hydraulic device, wherein the hydraulic oil cylinder is supported below the platform body along the vertical direction so as to drive the platform body to lift.
In this scheme, utilize single hydraulic cylinder or hydraulic means, just can realize the large stroke of platform body is flexible, compare with prior art, need not to set up multisection or a plurality of telescopic machanism to simplify equipment setting, improved the stability that carries the lift of car platform.
Preferably, the vehicle-carrying platform further comprises a supporting guide piece arranged at the lower part of the platform body, and the supporting guide piece is used for driving the platform body to lift when the hydraulic oil cylinder stretches.
In this scheme, support the guide for the lift of platform body provides the direction support function, prevents that hydraulic cylinder or hydraulic means from driving the in-process that the platform body goes up and down crooked, improves the reliability of carrying the car platform.
On the basis of the common knowledge in the field, the above preferred conditions can be combined at will to obtain the preferred embodiments of the present invention.
The utility model discloses an actively advance the effect and lie in: this hydraulic cylinder establishes a plurality of piston assembly cover in proper order for the piston rod of last one-level forms the base of next stage, analogizes and forms multistage telescopic machanism, and the extension length of the piston rod that from this can increase terminal for the base of first stage compares with the hydraulic cylinder of multistage independent setting, reduces hydraulic cylinder's part setting, simplifies hydraulic cylinder's structure. After the bottom cavity of the first-stage piston assembly is filled with hydraulic oil, the piston rod of the first stage slides in the direction far away from the base, the circulation cavity of the first stage is reduced, the hydraulic oil of the circulation cavity is pressed into the bottom cavity of the next piston assembly, and the like, the hydraulic oil in the bottom cavity of the tail end pushes the piston rod of the tail end to slide in the direction far away from the base, so that the extension of the piston rod of the multi-stage piston rod relative to the base is realized, and the piston rod stroke of the hydraulic oil cylinder is increased. And the drive power of the hydraulic oil cylinder only fills oil into the bottom cavity of the first stage for the hydraulic station, so that the synchronous extension and retraction of the piston rods of all stages can be realized in order to keep the pressure balance in the hydraulic cavity, and the piston rods are high in extension and retraction speed and stable in operation.
Drawings
Fig. 1 is a schematic structural view of a hydraulic cylinder according to a second embodiment of the present invention.
Fig. 2 is a schematic structural view of a piston rod of a hydraulic cylinder according to a second preferred embodiment of the present invention at a maximum extension position.
Fig. 3 is a schematic structural view of a piston rod of a hydraulic cylinder according to a second preferred embodiment of the present invention in a maximum contraction position.
Fig. 4 is a schematic structural view of a three-stage hydraulic cylinder according to a preferred embodiment of the present invention.
Fig. 5 is a schematic structural view of the vehicle carrying platform according to the preferred embodiment of the present invention.
Description of reference numerals:
Oil inlet and outlet 13
Piston rod 2
Piston part 21
The next stage 300
Detailed Description
The present invention will be more clearly and completely described below by way of examples and with reference to the accompanying drawings, but the present invention is not limited thereto.
Example 1
As shown in fig. 1-fig. 3, this embodiment discloses a hydraulic cylinder, this hydraulic cylinder includes two piston assemblies 10, each piston assembly 10 includes base 1 and piston rod 2, wherein, along first direction 100, the piston rod 2 of adjacent last level 200 forms the base 1 of next level 300, be equipped with the hydraulic pressure chamber in the base 1, piston rod 2 slides and locates the hydraulic pressure chamber, and separate into bottom cavity 11 and circulation cavity 12 with the hydraulic pressure chamber, hydraulic cylinder is established along first direction 100 cover in proper order by two piston assemblies 10, the circulation cavity 12 of the piston assembly 10 of adjacent last level 200 and the bottom cavity 11 of the piston assembly 10 of next level 300 communicate and inside all is full of hydraulic oil, bottom cavity 11 of the first level on first direction 100 is used for being connected with the hydraulic pressure station through the business turn over hydraulic fluid port 13 of locating on base 1, through business turn over the business turn over hydraulic oil with the flexible slip of drive second piston rod 2 to first direction 100.
In this embodiment, the two piston assemblies 10 are sequentially sleeved by the hydraulic cylinder, so that the piston rod 2 of the upper stage 200 forms the base 1 of the lower stage 300, and a two-stage telescopic mechanism is formed by analogy, thereby increasing the extension length of the piston rod 2 at the tail end relative to the base 1 of the first stage. After the bottom cavity 11 of the first-stage piston assembly 10 is filled with hydraulic oil, the piston rod 2 of the first stage slides in the direction far away from the base 1, the circulation cavity 12 of the first stage is reduced, the hydraulic oil of the circulation cavity 12 is pressed into the bottom cavity 11 of the next piston assembly 10, and so on, the hydraulic oil in the bottom cavity 11 at the tail end pushes the piston rod 2 at the tail end to slide in the direction far away from the base 1, the extension amount of the piston rod 2 at multiple stages relative to the base 1 is realized, and the stroke of the piston rod 2 of the hydraulic oil cylinder is increased. And the drive power of hydraulic cylinder only for hydraulic pressure station charge oil to first order bottom cavity 11 in, in order to keep the pressure balance in the hydraulic pressure intracavity, can realize the synchronous flexible of multistage piston rod 2, flexible fast and operate steadily. In fig. 4, a schematic structural view of a three-stage hydraulic cylinder is shown. Of course, in other embodiments, the hydraulic ram may include more than three piston assemblies.
In order to prevent the piston rod 2 from sliding to the maximum stroke position due to no hydraulic oil filled in the bottom cavity 11 in the circulating cavity 12, and further the extension of the hydraulic oil cylinder is influenced. In this embodiment, the cross-sectional area of the circulation chamber 12 of the adjacent upper stage 200 is not smaller than the cross-sectional area of the bottom chamber 11 of the piston assembly 10 of the adjacent lower stage 300.
Preferably, the cross-sectional area of the circulation cavity 12 of the previous stage 200 adjacent to the cross-sectional area of the bottom cavity 11 of the piston assembly 10 of the next stage 300 adjacent to the previous stage is equal to the cross-sectional area of the bottom cavity 11 of the previous stage, so that by utilizing the equal relation between the circulation cavity 12 and the bottom cavity 11, hydraulic oil flows back and forth between the circulation cavity 12 and the bottom cavity 11, and the space between the two cavities is utilized to the maximum extent, so that the extension amount and the contraction amount of the piston rod 2 are both in the maximum stroke within a certain volume range, and the extension amount of the piston rod 2 at the tail end is an integral multiple of the extension amount of the piston rod 2 of the first stage by taking the base 1 of the first stage as a starting point.
In this embodiment, as shown in fig. 1 and fig. 2, one end of the piston rod 2 close to the bottom cavity 11 is a piston portion 21, one end of the piston rod away from the bottom cavity 11 is a rod 22, the piston portion 21 is slidably fitted in the base 1, and the piston portion 21 of the next stage 300 is driven to telescopically slide in the first direction 100 by oil entering and exiting from the bottom cavity 11 of the previous stage 200. Be provided with the bottom cavity 11 of adjacent next stage 300 piston assembly 10 in the body of rod 22, circulation cavity 12 is the outer wall of the body of rod 22, the cavity that the inner wall of piston portion 21 and base 1 encloses, the inner space of make full use of piston rod 2 forms bottom cavity 11, and piston rod 2 still encloses into circulation cavity 12 with the inner wall of the base 1 of last stage 200, make piston rod 2 have the dual identity of the piston rod 2 of last stage 200 and the base 1 of next stage 300, the inner space utilization efficiency of piston rod 2 has been improved.
In order to facilitate the piston part 21 of the piston rod 2 to slide smoothly in the cavity of the base 1, the clamping stagnation is prevented. The cavity of base 1 is cylindrical, and bottom cavity 11 in the body of rod 22 is cylindrical, and the periphery cross section radius of piston portion 21 equals with the inner wall cross section radius of the cavity of base 1, and the cross section radius of the body of rod 22 is less than the cross section radius of base 1, and circulation cavity 12 is the cavity that the circumference outer wall of the body of rod 22, piston portion 21 and the inner wall of base 1 enclose.
In this embodiment, as shown in fig. 1 to 4, the circulation cavity 12 of the piston assembly 10 of the previous stage 200 and the bottom cavity 11 of the piston assembly 10 of the next stage 300 along the first direction 100 are communicated through the through hole 23 on the wall surface of the base 1 of the piston assembly 10 of the next stage 300, so that the circulation cavity 12 of the previous stage 200 is conveniently communicated with the bottom cavity 11 of the next stage 300, the structure is simplified, and the sealing performance between the cavities is not affected.
Preferably, the through hole 23 is provided near the piston portion 21 of the piston rod 2 to increase the telescopic stroke of the piston rod 2. When the piston rod 2 slides to the bottom of the bottom cavity 11, the piston portion 21 does not block the through hole 23.
As an implementation manner, the number of the through holes 23 is at least two, and the at least two through holes 23 are uniformly arranged on the base 1 at intervals along the circumferential direction of the hydraulic oil cylinder, so that hydraulic oil can uniformly and rapidly flow between the circulation cavity 12 and the bottom cavity 11, the stress on the piston rod 2 is balanced, and the sliding stability of the piston rod 2 is increased.
In the present embodiment, as shown in fig. 1 to 3, the number of the piston assemblies 10 is two, and the amount of extension of the end piston rod 2 is twice as much as the amount of extension of the first-stage piston rod 2, starting from the base 1 of the first stage.
On this basis, the hydraulic cylinder further includes a control valve (not shown) mounted to the oil inlet/outlet port 13 for opening or closing the oil inlet/outlet port 13. When the control valve is closed, the piston rod 2 is kept in a certain supporting position. When the control valve is opened, the piston rod 2 is extended or retracted by injecting oil or discharging oil into the bottom cavity 11 of the first stage.
Example 2
The embodiment discloses a hydraulic device, it includes hydraulic cylinder, hydraulic servo motor, oil storage cylinder and the hydraulic pressure pipe of embodiment 1, and the business turn over hydraulic fluid port passes through hydraulic pressure union coupling in the oil storage cylinder, and hydraulic servo motor installs and is used for toward the interior oiling of bottom cavity or take out the oil in the bottom cavity to the oil storage cylinder in the hydraulic pressure pipe. The hydraulic servo motor corotation, hydraulic pressure station begins to work and supplies oil in the bottom cavity for the first order, the piston rod of the first order of fluid jacking stretches out, will circulate the hydraulic oil extrusion in the cavity when the piston rod of first order stretches out, make it get into in the bottom cavity of next piston assembly, analogize with this, along with hydraulic oil constantly pours into the bottom cavity of first order into, in order to keep the pressure balance in the hydraulic pressure cavity, multistage piston rod is all flexible in step, make the terminal whole stroke of piston rod of hydraulic cylinder grow and reach jacking platform purpose.
The hydraulic servo motor reverses, the hydraulic station starts to work to pump out the hydraulic oil in the bottom cavity of the first level, all levels of piston rods flow back to the circulating cavity under the action of the gravity of the carried object and the atmospheric pressure, all levels of piston rods slide towards the bottom of the base, and along with the pumping out of the hydraulic oil from the bottom cavity of the first level, all levels of piston rods stretch out and draw back synchronously to achieve the purpose of contraction.
The hydraulic station further comprises an electromagnetic valve, and the electromagnetic valve is mounted on the hydraulic pipe and used for opening or closing the hydraulic pipe. In this embodiment, the solenoid valve is an on-off valve, and can be controlled by the intelligent control board, and is used for opening or closing the hydraulic pipe, so as to realize the automatic control of the hydraulic device.
Example 3
As shown in fig. 5, the embodiment discloses a vehicle-carrying platform, where the vehicle-carrying platform 20 includes a platform body 202 and a hydraulic oil cylinder 201 of embodiment 1 or a hydraulic device of embodiment 2, and the hydraulic oil cylinder 201 is supported below the platform body 202 along a vertical direction to drive the platform body 202 to lift. This car carrying platform 20 can utilize single hydraulic cylinder 201 or hydraulic means, just can realize the large stroke of platform body 202 and stretch out and draw back, compares with prior art, need not to set up multisection or a plurality of telescopic machanism to simplify the equipment setting.
In order to realize the stable lifting of the platform body 202, the vehicle carrying platform 20 further includes a support guide 203 disposed at the lower portion of the platform body 202, and the support guide 203 is used for driving the platform body 202 to lift when the hydraulic cylinder 201 extends and retracts. The supporting guide piece 203 provides a guiding function for the lifting of the platform body 202, prevents the hydraulic oil cylinder 201 or a hydraulic device from tilting in the process of driving the platform body 202 to lift, and improves the reliability of the vehicle-carrying platform 20.
In this embodiment, the supporting guide 203 of the scissor rack mechanism is adopted, one end of the scissor rack mechanism is connected to the chassis, the other end of the scissor rack mechanism is connected to the battery replacing platform and used for guiding the battery replacing platform to move up and down, the scissor rack mechanism comprises a first support arm and a second support arm which are hinged to each other, the lower end of the first support arm is rotatably connected to the chassis, the upper end of the first support arm is slidably connected to the battery replacing platform, the upper end of the second support arm is rotatably connected to the battery replacing platform, and the lower end of the second support arm is slidably connected to the chassis.
Although specific embodiments of the present invention have been described above, it will be understood by those skilled in the art that this is by way of example only and that the scope of the invention is defined by the appended claims. Various changes and modifications to these embodiments may be made by those skilled in the art without departing from the spirit and the principles of the present invention, and these changes and modifications are all within the scope of the present invention.
Claims (14)
1. The utility model provides a hydraulic cylinder, its characterized in that, it includes two at least piston assembly, piston assembly includes base and piston rod, wherein, along the first direction, adjacent last one-level the piston rod forms the next grade the base, be equipped with the hydraulic pressure chamber in the base, the piston rod slides and locates the hydraulic pressure chamber, and will bottom cavity and circulation cavity are separated into to the hydraulic pressure chamber, hydraulic cylinder is by at least two piston assembly overlaps in proper order along the first direction and establishes, adjacent last one-level piston assembly's circulation cavity and next grade piston assembly's bottom cavity intercommunication and inside all are full of hydraulic oil, follow the bottom cavity of first order is through locating business turn over hydraulic fluid port on the base is used for being connected with the hydraulic pressure station, through business turn over oil in order to drive at least second grade the piston rod slides to the first direction is flexible.
2. The hydraulic ram of claim 1, wherein the cross-sectional area of the circulation chamber of the adjacent upper stage is not less than the cross-sectional area of the bottom chamber of the piston assembly of the adjacent lower stage.
3. The hydraulic ram of claim 2, wherein the cross-sectional area of the circulation chamber of the adjacent upper stage is equal to the cross-sectional area of the bottom chamber of the piston assembly of the adjacent lower stage.
4. The hydraulic cylinder according to claim 3, wherein one end of the piston rod close to the bottom cavity is a piston portion, one end of the piston rod far from the bottom cavity is a rod body, the piston portion is in sliding fit in the base and drives the piston portion of an adjacent next stage to telescopically slide in a first direction through oil entering and exiting from the bottom cavity of the previous stage, the bottom cavity of the piston assembly of the adjacent next stage is arranged in the rod body, and the circulating cavity is a cavity defined by an outer wall of the rod body, the piston portion and an inner wall of the base.
5. The hydraulic cylinder as recited in claim 4, wherein the cavity of the base is cylindrical, the bottom cavity in the rod is cylindrical, the outer peripheral cross-sectional radius of the piston portion is equal to the inner wall cross-sectional radius of the cavity of the base, the cross-sectional radius of the rod is smaller than the cross-sectional radius of the base, and the circulating cavity is defined by the outer peripheral wall of the rod, the piston portion and the inner wall of the base.
6. The hydraulic ram of claim 1 wherein the circulation chamber of the upper piston assembly and the bottom chamber of the lower piston assembly in the first direction communicate through a through hole in the base wall of the lower piston assembly.
7. The hydraulic ram of claim 6, wherein the via is disposed proximate the piston portion of the piston rod.
8. The hydraulic cylinder of claim 6, wherein the number of the through holes is at least two, and the at least two through holes are arranged on the base at regular intervals along the circumferential direction of the hydraulic cylinder.
9. The hydraulic ram of claim 1 wherein the number of piston assemblies is two.
10. The hydraulic cylinder of claim 1, further comprising a control valve mounted to the oil inlet/outlet for opening or closing the oil inlet/outlet.
11. A hydraulic apparatus, comprising a hydraulic cylinder according to any one of claims 1 to 10, a hydraulic servo motor, a reservoir and a hydraulic pipe, wherein the oil inlet and the oil outlet are connected to the reservoir through the hydraulic pipe, and the hydraulic servo motor is mounted on the hydraulic pipe for injecting oil into the bottom cavity or pumping the oil in the bottom cavity to the reservoir.
12. The hydraulic apparatus of claim 11, wherein the hydraulic station further comprises a solenoid valve mounted to the hydraulic tube for opening or closing the hydraulic tube.
13. A vehicle-carrying platform, characterized in that it comprises a platform body and a hydraulic oil cylinder as defined in any one of claims 1 to 10 or a hydraulic device as defined in any one of claims 11 to 12, the hydraulic oil cylinder being supported vertically below the platform body to drive the platform body to lift.
14. The vehicle carrying platform of claim 13, further comprising a support guide member disposed at a lower portion of the platform body, the support guide member being adapted to drive the platform body to lift when the hydraulic cylinder extends and retracts.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221694542.XU CN218093714U (en) | 2022-06-30 | 2022-06-30 | Hydraulic oil cylinder, hydraulic device and vehicle-carrying platform |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221694542.XU CN218093714U (en) | 2022-06-30 | 2022-06-30 | Hydraulic oil cylinder, hydraulic device and vehicle-carrying platform |
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| Publication Number | Publication Date |
|---|---|
| CN218093714U true CN218093714U (en) | 2022-12-20 |
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| CN202221694542.XU Active CN218093714U (en) | 2022-06-30 | 2022-06-30 | Hydraulic oil cylinder, hydraulic device and vehicle-carrying platform |
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| Country | Link |
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| CN (1) | CN218093714U (en) |
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