CN214578061U - Integrated synchronous hydraulic cylinder and synchronous lifting system thereof - Google Patents

Abstract

The utility model discloses an integrated synchronous hydraulic cylinder and a synchronous lifting system thereof, belonging to the technical field of hydraulic transmission, wherein the side walls of each cylinder barrel unit, a transition end cover and a rear end cover of the integrated synchronous hydraulic cylinder are provided with A port oil ways which are mutually communicated, and the A port oil ways are communicated with oil cavities at the rear side of each piston; the side walls of each cylinder barrel unit, the transition end cover and the rear end cover are provided with pre-charging oil ways which are communicated with each other, the pre-charging oil ways are communicated with oil cavities on the front sides of the pistons, and each one-way valve mounting opening is communicated with the pre-charging oil ways; and the side walls of each cylinder barrel unit, the transition end cover and the rear end cover are provided with T-port oil ways which are communicated with each other, and the T-port oil ways are communicated with the oil cavities at the front sides of the pistons. The utility model provides a synchronous pneumatic cylinder of integrated form and synchronous operating system thereof realizes synchronous requirement on integrating each valve unit to synchronous pneumatic cylinder together, and the integrated formation degree is higher, has saved installation space, has improved the sealing reliability of pipeline.

Description

Integrated synchronous hydraulic cylinder and synchronous lifting system thereof

Technical Field

The utility model relates to a synchronous pneumatic cylinder of integrated form and synchronous operating system thereof belongs to hydraulic transmission technical field.

Background

Synchronous hydraulic circuits are used in many applications for hydraulic transmissions, with different components being used depending on the requirements of the application. The requirements can be met by using a throttle valve and a flow dividing and collecting valve in a synchronous circuit with low synchronization requirements, and the requirements can be met by using a speed regulating valve and a synchronous motor in a circuit with high synchronization requirements. In a circuit with high synchronization requirements, a proportional flow valve and a synchronization cylinder are needed to realize the synchronization. However, when the proportional flow valve is used for controlling the synchronization, a proportional flow valve is required to be arranged in each synchronization loop, and a displacement sensor is required to be arranged on an execution hydraulic cylinder, so that the loops form a closed-loop control system with feedback. Besides, an oil circuit block is additionally arranged outside the synchronous hydraulic cylinder for installing a control valve group so as to realize the synchronous requirement. Therefore, the synchronous loop system using the proportional valve has the advantages of more pipelines, large occupied space, complex electric control system and high cost.

The above description is included in the technical recognition scope of the inventors, and does not necessarily constitute the prior art.

SUMMERY OF THE UTILITY MODEL

The utility model discloses a solve the problem that prior art exists, provide a synchronous pneumatic cylinder of integrated form and synchronous operating system thereof, improved synchronous precision to actuating system's piping erection has been simplified.

The utility model discloses an adopt following technical scheme to realize above-mentioned purpose:

on one hand, the utility model provides an integrated synchronous hydraulic cylinder, which comprises n cylinder barrel units, n-1 transition end covers, a front end cover, a rear end cover, a piston rod and n pistons; the rear port of the ith cylinder barrel unit and the front port of the (i + 1) th cylinder barrel unit are respectively connected with the front end face and the rear end face of the ith transition end cover, the front port of the 1 st cylinder barrel unit is connected with the rear end face of the front end cover, and the rear port of the nth cylinder barrel unit is connected with the front end face of the rear end cover; the n pistons are respectively arranged in the n cylinder barrel units, the n pistons are all sleeved on piston rods, and the piston rods penetrate through the n cylinder barrel units;

the front end cover is provided with a 1 st cartridge check valve mounting port, a 1 st cartridge overflow valve mounting port and an oil cavity A communicated with the oil cavity in the front side of the 1 st piston₁A mouth; an i +1 th cartridge check valve mounting port communicated with an oil cavity at the front side of the i +1 th piston, an i +1 th cartridge overflow valve mounting port and an A communicated with the oil cavity at the front side of the i +1 th piston are formed in the ith transition end cover_i+1A port, wherein i ∈ (1, n-1);

the side walls of each cylinder barrel unit, the transition end cover and the rear end cover are provided with an A-port oil way which is communicated with each other, and the A-port oil way is communicated with the oil cavity at the rear side of each piston; the rear end cover is provided with an A0 port, and the A0 port is communicated with an A port oil way;

the side walls of each cylinder barrel unit, the transition end cover and the rear end cover are provided with pre-charging oil ways which are communicated with each other, the pre-charging oil ways are communicated with oil cavities on the front sides of the pistons, and each one-way valve mounting opening is communicated with the pre-charging oil ways;

the side walls of each cylinder barrel unit, the transition end cover and the rear end cover are provided with T-port oil ways which are mutually communicated, the T-port oil ways are communicated with oil cavities at the front sides of the pistons, and each plug-in overflow valve mounting port is communicated with the T-port oil way; and the rear end cover is provided with a T port, and the T port is communicated with a T port oil way.

Optionally, the integrated synchronous hydraulic cylinder further comprises a synchronous control valve group and an oil pre-filling control valve group which are arranged on the rear end cover, the synchronous control valve group comprises a three-position four-way electromagnetic valve, and the oil pre-filling control valve group comprises a two-position four-way electromagnetic valve, n plug-in overflow valves and n plug-in check valves;

a working oil port A of the three-position four-way electromagnetic valve is communicated with a port A0, and a working oil port B of the two-position four-way electromagnetic valve is communicated with a pre-charging oil way;

the n plug-in overflow valves are respectively plugged in the n plug-in overflow valve mounting openings, and the n plug-in check valves are respectively plugged in the plug-in check valve mounting openings.

Optionally, the synchronous control valve group further comprises a pilot check valve, and the pilot check valve is communicated between the working oil port a of the three-position four-way valve and the port a0 of the synchronous hydraulic cylinder.

Optionally, the synchronous control valve group further comprises a one-way throttle valve, and the one-way throttle valve is communicated between the pilot-controlled check valve and the port a0 of the synchronous hydraulic cylinder.

Optionally, the oil liquid pre-filling control valve group further comprises a pressure reducing valve, and the pressure reducing valve is communicated with an oil inlet P of the two-position four-way electromagnetic valve.

Optionally, the piston rod is formed by assembling n piston rod units, and the n pistons are respectively sleeved on the n piston rod units.

Optionally, one end of each piston rod unit is provided with a threaded hole, the other end of each piston rod unit is provided with a reducing step, the piston is sleeved on the reducing step corresponding to the piston rod unit, an external thread is arranged at the outer end of the reducing step, and the rear end of the ith piston rod unit is connected with the front end of the (i + 1) th piston rod unit in a matched mode through the threaded hole and the external thread so as to clamp the ith piston between the two piston rod units.

Optionally, a hole in the middle of the piston through which the piston rod unit passes is a stepped hole.

Optionally, the front end cover, the cylinder barrel unit, the transition end cover and the rear end cover are fastened and connected into a whole through a connecting rod.

On the other hand, the utility model also provides a synchronous lifting system, which comprises n actuating hydraulic cylinders, the synchronous hydraulic cylinder, the synchronous control valve group and the oil liquid pre-charging control valve group;

a of the synchronous hydraulic cylinder₁Mouth and A_i+1The ports are respectively and correspondingly communicated with rodless cavities of the n execution hydraulic cylinders through connecting pipelines, and rod cavities of the n execution hydraulic cylinders are respectively and correspondingly communicated with working oil ports B of the three-position four-way electromagnetic valve through connecting pipelines;

and an oil inlet P of the three-position four-way electromagnetic valve and an oil inlet P of the two-position four-way electromagnetic valve are both communicated with a hydraulic power source, and an oil return port T of the three-position four-way electromagnetic valve and an oil return port T of the two-position four-way electromagnetic valve are both communicated with an oil tank.

Benefits of the present application include, but are not limited to:

the utility model provides an integrated form synchronous pneumatic cylinder and synchronous operating system thereof, (1) can be according to the quantity of the synchronous return circuit of actual need with the cylinder unit of required quantity, transition end cover, piston rod unit and front end housing, rear end cap equipment synchronous pneumatic cylinder, the installation is nimble, commonality, interchangeability are strong, be more easily realized the design and manufacture standardization, easily realize batch production, improved work efficiency; (2) all the control valve groups are integrated on the synchronous hydraulic cylinder together to realize the synchronous requirement, and the integration degree is higher; (3) except for the pipeline connected with the execution hydraulic cylinder, the synchronous hydraulic cylinder is communicated with the execution hydraulic cylinder, so that the installation space is saved, and the sealing reliability of the pipeline is improved; (4) the connecting pipeline between the synchronous hydraulic cylinder and the execution hydraulic cylinder is internally filled with oil liquid in advance before working, so that the volumes of the oil liquid entering (flowing out) the execution hydraulic cylinder are equal, and the extending (retracting) distances of a piston rod of the execution hydraulic cylinder are equal. And the piston in the synchronous cylinder is mechanically connected with the piston rod unit, so that the accumulated error caused by volume change of oil liquid due to extrusion is reduced, the synchronous precision is improved, synchronous rising (descending) is realized, the high-precision synchronous requirement can be realized as long as the high manufacturing precision of the synchronous hydraulic cylinder and the execution hydraulic cylinder is ensured, the synchronous hydraulic cylinder and the execution hydraulic cylinder are consistent with the using effect of a system which uses a proportional flow valve for synchronous control, and the economical efficiency is higher.

Drawings

The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the application and together with the description serve to explain the application and not to limit the application. In the drawings:

fig. 1 is a schematic cross-sectional structural view of an integrated synchronous hydraulic cylinder provided by the present invention;

fig. 2 is a schematic structural diagram of a transition end cover in the integrated synchronous hydraulic cylinder provided by the present invention;

fig. 3 is a schematic structural view of a cylinder unit in the integrated synchronous hydraulic cylinder provided by the present invention;

fig. 4 is a schematic structural diagram of a rear end cover in the integrated synchronous hydraulic cylinder provided by the present invention;

fig. 5 is a schematic diagram of an oil path of the synchronous lifting system provided by the present invention;

in the figure, 10, a synchronous hydraulic cylinder; 11. a cylinder unit; 12. a transition end cap; 13. a front end cover; 14. a rear end cap; 15. a piston; 16. a piston rod unit; 161. reducing the diameter of the step; 21. a mounting port of the cartridge check valve; 22. an overflow valve mounting port is inserted; 23. a. the_i+1A mouth; 24. an oil passage A; 25. pre-charging an oil way; 26. a T-port oil way; 30. a synchronous control valve group; 31. a three-position four-way electromagnetic valve; 32. a hydraulic control check valve; 33. a one-way throttle valve; 40. an oil liquid pre-charging control valve group; 41. a two-position four-way solenoid valve; 42. an overflow valve is inserted; 43. inserting a one-way valve; 44. a pressure reducing valve; 50. and an actuating hydraulic cylinder.

Detailed Description

In order to clearly illustrate the technical features of the present invention, the present invention is explained in detail by the following embodiments in combination with the accompanying drawings.

It should be noted that in the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced in other ways than those described herein. Accordingly, the scope of the present invention is not limited by the specific embodiments disclosed below.

As shown in fig. 1-4, the integrated synchronous hydraulic cylinder provided by the present invention comprises n cylinder units 11, n-1 transition end caps 12, a front end cap 13, a rear end cap 14, a piston rod and n pistons 15; the rear port of the ith cylinder barrel unit and the front port of the (i + 1) th cylinder barrel unit are respectively connected with the front end face and the rear end face of the ith transition end cover, the front port of the 1 st cylinder barrel unit is connected with the rear end face of the front end cover 13, and the rear port of the nth cylinder barrel unit is connected with the front end face of the rear end cover 14; n pistons 15 are arranged in n cylinder units 11 respectively, and n pistons 15 all suit on the piston rod, and the piston rod runs through n cylinder units 11. For convenience of description, the extending direction of the piston rod is defined as the front side or the front end, the cylinder unit closest to the front end cover 13 is the 1 st cylinder unit, and the transition end cover closest to the front end cover 13 is the 1 st transition end cover.

For example, when 4-way synchronization is performed, the number of oil chambers in the synchronous hydraulic cylinder is 4, 3 transition end covers 12 and 4 cylinder units 11 are needed, and the number of pistons 15 is 4. If 6 paths of synchronization are carried out, the number of oil chambers in the synchronous hydraulic cylinder is 6, 5 transition end covers 12 and 6 cylinder barrel units 11 are needed, and the number of pistons 15 is 6.

Usually, four connecting through holes are arranged on the peripheries of the front end cover 13, the transition end cover 12 and the rear end cover 14, as shown in fig. 1, the rear end face of the front end cover 13, the front end face of the rear end cover 14 and the front and rear end faces of the transition end cover 12 are all provided with a spigot platform, so that the end part of the cylinder unit 11 is abutted against the corresponding spigot platform, and then the components are tensioned and fixed into a whole through connecting rods passing through the connecting through holes on the front end cover 13, the transition end cover 12 and the rear end cover 14, thereby forming a complete synchronous hydraulic cylinder.

The synchronous hydraulic cylinder is made of light alloy materials, can be purchased anywhere in the market, does not need to be customized, and is relatively low in price. And on the premise of meeting the functionality, the weight of the synchronous hydraulic cylinder is reduced, so that the economy is improved. All the transitional end covers 12 and the cylinder barrel units 11 are consistent in size, any one of the transitional end cover 12 and the cylinder barrel unit 11 can be taken out to be interchanged with spare parts, and interchangeability is strong; besides the front end cover 13 and the rear end cover 14, the use amount of other parts is large, and the mass production is easy, so that the production cost is reduced. Therefore, the required number of cylinder barrel units 11, the transition end covers 12, the pistons 15, the front end cover 13 and the rear end cover 14 can be assembled into the synchronous hydraulic cylinder according to the number of the synchronous loops required in practice, the installation is flexible, the universality and the interchangeability are strong, the design and manufacture standardization is easier to realize, the batch production is easy to realize, and the working efficiency is improved.

In one embodiment, the cylinder unit 11, the transition end cover 12, the front end cover 13 and the rear end cover 14 are square in outer portion, the cylinder unit 11 is formed with an oil chamber having a circular cross section in the inner portion, and the piston 15 is cylindrical.

As shown in fig. 2-4, the utility model provides an among the synchronous pneumatic cylinder of integrated form, seted up 1 st cartridge check valve installing port 21, 1 st cartridge overflow valve installing port 22 and the A that communicates with the oil pocket of 1 st piston 15 front side on the front end housing 13₁A mouth; an i +1 th cartridge check valve mounting port 21 communicated with an oil cavity at the front side of the i +1 th piston 15, an i +1 th cartridge overflow valve mounting port 22 and an A communicated with the oil cavity at the front side of the i +1 th piston 15 are formed in the ith transition end cover 12_i+1 Port 23, where i ∈ (1, n-1);

the side walls of each cylinder barrel unit 11, the transition end cover 12 and the rear end cover 14 are provided with an A-port oil way 24 which is communicated with each other, and the A-port oil way 24 is communicated with the oil cavity at the rear side of each piston 15; the rear end cover 14 is provided with an A0 port, and an A0 port is communicated with the A port oil path 24. The port a oil passage 24 is used for conveying oil to an oil chamber on the rear side of each piston 15, and pushing the piston 15 to move forward.

The side walls of each cylinder barrel unit 11, the transition end cover 12 and the rear end cover 14 are provided with pre-charging oil passages 25 which are communicated with each other, the pre-charging oil passages 25 are communicated with oil cavities at the front sides of the pistons 15, and each cartridge one-way valve mounting opening 21 is communicated with the pre-charging oil passages 25. The pre-charging oil way 25 is used for conveying oil into connecting pipelines between each oil cavity of the synchronous hydraulic cylinder and each execution hydraulic cylinder, and the inserted one-way valve mounting port 21 is used for mounting the inserted one-way valve 43 and only allows the oil to enter the connecting pipelines between the synchronous hydraulic cylinder and the execution hydraulic cylinder and cannot flow backwards.

The side walls of each cylinder barrel unit 11, the transition end cover 12 and the rear end cover 14 are provided with T-port oil ways 26 which are mutually communicated, the T-port oil ways 26 are communicated with oil cavities at the front sides of the pistons 15, and each plug-in overflow valve mounting port 22 is communicated with the T-port oil way 26; the rear end cover 14 is provided with a T-shaped port which is communicated with a T-shaped port oil way 26.

In a preferred embodiment, the utility model provides a synchronous pneumatic cylinder of integrated form is still including setting up synchronous control valves 30 and the fluid preliminary filling valve group 40 on rear end cap 14, and synchronous control valves includes three-position four-way solenoid valve 31, and fluid preliminary filling valve group includes two-position four-way solenoid valve 41, a n cartridge overflow valve 42 and a n cartridge check valve 43.

The n relief valves 42 are respectively inserted into the n relief valve mounting ports 22, and the n check valves 43 are respectively inserted into the check valve mounting ports 21.

Further, the synchronous control valve group also comprises a hydraulic control one-way valve 32, and the hydraulic control one-way valve 32 is communicated between a working oil port A of the three-position four-way valve and an A0 port of the synchronous hydraulic cylinder.

Further, the synchronous control valve group also comprises a one-way throttle valve 33, and the one-way throttle valve 33 is communicated between the pilot-controlled one-way valve 32 and the port A0 of the synchronous hydraulic cylinder. When the workpiece descends, the one-way throttle valve 33 can establish oil return resistance in an oil path, control the descending speed of the workpiece and ensure that the execution oil cylinder descends stably instead of falling to the bottom instantly.

Furthermore, the oil pre-filling control valve group further comprises a pressure reducing valve 44, and the pressure reducing valve 44 is communicated with an oil inlet P of the two-position four-way electromagnetic valve 41. The two-position four-way solenoid valve 41 and the three-position four-way solenoid valve 31 are supplied with oil by using one hydraulic source, when a workpiece is jacked, the pressure required by the three-position four-way solenoid valve 31 is high, the two-position four-way solenoid valve 41 does not need too high pressure, and only the oil is ensured to flow into the pre-charging oil way 25 and be fully filled with the oil way, so that the pressure reducing valve 44 can reduce the pressure of the oil pre-charging pipeline, and the pressure of the circuit is reduced.

The utility model provides an among the hydraulic drive system, realize synchronous requirement on integrating each valves to synchronous pneumatic cylinder together, integrated formation degree is higher. During the use, synchronous pneumatic cylinder and valve unit can regard as the direct use of standard part, need not carry out other secondary assembly again, and convenient and fast has improved work efficiency, has reduced the error rate risk that secondary installation brought.

In another preferred embodiment, the piston rod is assembled from n piston rod units 16, and n pistons 15 are respectively fitted over the n piston rod units 16. Therefore, the pistons 15 in the synchronous hydraulic cylinders are mechanically connected, so that no matter which piston 15 in the synchronous hydraulic cylinder moves first, other pistons 15 are driven by the piston rods to synchronously move in the same direction and the same displacement, the volumes of oil output (input) from (into) each oil cavity are equal, and the accumulated error caused by the volume change of the oil due to extrusion is reduced.

Further, one end of each piston rod unit 16 is provided with a threaded hole, the other end of each piston rod unit 16 is provided with a reducing step 161, the piston 15 is sleeved on the reducing step 161 corresponding to the piston rod unit 16, an external thread is arranged at the outer end of the reducing step 161, and the rear end of the ith piston rod unit is matched and connected with the front end of the (i + 1) th piston rod unit through the threaded hole and the external thread so as to clamp the ith piston 15 between the two piston rod units 16. As shown in fig. 1, the front end face of each piston 15 is positioned by a reduced diameter step 161 on its own piston rod unit, and the rear end face is fixed by the front end face of the next piston rod unit, restricting the axial movement of the piston 15.

Further, the hole in the middle of the piston 15 through which the piston rod unit 16 passes is a stepped hole, which enables the position of the piston 15 to be more closely defined.

It will be appreciated that seals are provided on the interface of the piston rod unit 16 with the piston 15, on the interface of the piston 15 with the cylinder unit 11, and on the interface of the cylinder unit 11 with the transition end cap 12, the front end cap 13 and the rear end cap 14. Specifically, each piston rod unit 16 is provided with an annular sealing groove on the circumferential surface before size contraction, each piston 15 is provided with an annular sealing groove on the circumferential surface, each spigot boss is provided with an annular sealing groove on the circumferential surface, and a sealing ring is arranged in each sealing groove to seal the corresponding contact surface.

On the other hand, as shown in fig. 5, the utility model also provides a synchronous operating system, including n actuating cylinder 50 and foretell synchronous pneumatic cylinder 10, synchronous control valves 30 and fluid pre-charge control valves 40, the hydro-cylinder parameter homogeneous phase and the manufacturing accuracy of each actuating cylinder are higher.

A of synchronous hydraulic cylinder₁Mouth and A_i+1The ports are respectively and correspondingly communicated with the rodless cavities of the n execution hydraulic cylinders through connecting pipelines, and the rod cavities of the n execution hydraulic cylinders are respectively and correspondingly communicated with the working oil ports B of the three-position four-way electromagnetic valve 31 through connecting pipelinesCorrespondingly communicating;

an oil inlet P of the three-position four-way electromagnetic valve 31 and an oil inlet P of the two-position four-way electromagnetic valve 41 are both communicated with a hydraulic power source, and an oil return port T of the three-position four-way electromagnetic valve 31 and an oil return port T of the two-position four-way electromagnetic valve 41 are both communicated with an oil tank.

The rear end cover 14 is provided with a T-shaped port which is communicated with a T-shaped port oil way 26. The working oil port T of the two-position four-way electromagnetic valve 41 and the working oil port T of the three-position four-way electromagnetic valve 31 are communicated with a T port, and the T port is also communicated with an oil tank; when the connecting lines between the oil chambers of the synchronous hydraulic cylinders and the actuating hydraulic cylinders are pre-filled with oil, the overflowing oil enters the T-port oil passage 26 through the inserted overflow valve 42 and then flows back to the oil tank from the T port.

The rear end cover is also provided with ports B0, B1 and P, a working oil port P of the two-position four-way solenoid valve 41 and a working oil port P of the three-position four-way solenoid valve 31 are communicated with the ports P, and the ports P are also communicated with a hydraulic power source;

the pre-charging oil path 25 is communicated with a port B1, and a port B1 is also communicated with a working oil port B of the two-position four-way electromagnetic valve 41;

the working oil port A of the three-position four-way electromagnetic valve 31 is communicated with the port A0;

the working oil port B of the three-position four-way electromagnetic valve 31 is communicated with a port B0, and a port B0 is also communicated with a rod cavity of the execution hydraulic cylinder.

The working port A of the two-position four-way electromagnetic valve 41 is not used, and the oil path is blocked.

The port A0, the port B0, the port B1, the port T and the port P which are arranged on the rear end cover are matched with a process channel arranged in the rear end cover, and all valves, oil passages, a hydraulic power source and an oil tank are connected in a specific connecting mode which is a conventional technical means in the field and is not described herein in detail.

It can be seen that, the utility model provides an among the synchronous operating system, except the pipeline that synchronous pneumatic cylinder links to each other with the actuating cylinder, all realize the intercommunication in synchronous pneumatic cylinder, saved installation space, improved the sealing reliability of pipeline.

Before work, the hydraulic power source supplies oil, the two-position four-way solenoid valve 41 is powered on, oil is controlled to enter a connecting pipeline between the synchronous hydraulic cylinder and the execution hydraulic cylinder, the synchronous hydraulic cylinder and the execution hydraulic cylinder run for a plurality of rounds in no-load mode, the connecting pipeline between the synchronous hydraulic cylinder and the execution hydraulic cylinder is full of oil, and the two-position four-way solenoid valve 41 is powered off after air is completely removed.

The process is used for filling oil into a connecting pipeline between the synchronous hydraulic cylinder and the execution hydraulic cylinder before the synchronous lifting system works, and air in the connecting pipeline and the execution hydraulic cylinder is removed by using the plug-in overflow valve 42. The relief valve 42 also functions here as a line relief valve, the check valve 43 only allowing the oil to enter the connecting line between the synchronous cylinder and the actuator cylinder and not flowing backwards.

When a workpiece needs to ascend, a hydraulic power source supplies oil, one end of the three-position four-way electromagnetic valve 31 is electrified, the directions P → A and B → T are communicated, control oil enters oil cavities at the rear sides of the pistons 15 of the synchronous hydraulic cylinders through an opening A0 to push piston rods to extend forwards, the oil in the oil cavities at the front sides of the pistons 15 is extruded to enter rodless cavities of the execution hydraulic cylinders through connecting pipelines between the synchronous hydraulic cylinders and the execution hydraulic cylinders, the piston rods of the execution hydraulic cylinders are synchronously pushed to extend upwards to jack the workpiece, and synchronous ascending is achieved. The oil in the rod cavity of the execution hydraulic cylinder is extruded to enter the working port B of the three-position four-way electromagnetic valve 31 and finally flows back to the oil tank.

When the workpiece needs to fall back, the other end of the three-position four-way electromagnetic valve 31 is electrified, and the directions P → B and A → T are communicated, so that the oil is controlled to enter the rod cavities of the execution hydraulic cylinders through the port B0, the oil pushes the pistons 15 of the execution hydraulic cylinders to retract, the piston rods are driven to fall, the workpiece falls back, and synchronous falling is achieved. And the oil in the rodless cavity of the execution hydraulic cylinder enters the oil cavity at the front side of each piston 15 of the synchronous hydraulic cylinder through the third connecting pipeline, the oil in the oil cavity at the rear side of each piston 15 is extruded to enter the first connecting pipeline, then is sent to the working port B of the three-position four-way electromagnetic valve 31, and finally flows back to the oil tank.

Because the third connecting pipeline between the synchronous hydraulic cylinder and the execution hydraulic cylinder is filled with oil in advance, the volumes of the oil entering (flowing out) the execution hydraulic cylinder are equal, the extending (retracting) distances of the piston rods of the execution hydraulic cylinders are equal, and synchronous rising (descending) is realized.

To sum up, the utility model provides a hydraulic drive system, the inherent before-working of connecting line between synchronous pneumatic cylinder and the actuating cylinder is full of fluid in advance, so get into (flow out) the fluid volume in the actuating cylinder also all equal, and then the distance that makes the piston rod of actuating cylinder stretch out (retract) also equals. And the piston in the synchronous cylinder is mechanically connected with the piston rod unit, so that the accumulated error caused by volume change of oil due to extrusion is reduced, and the synchronous precision is increased, thereby realizing synchronous rising (falling), having the same using effect as a system using a proportional flow valve for synchronous control, but having higher economical efficiency.

In the description of the present invention, it is to be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", and the like, indicate orientations and positional relationships based on those shown in the drawings, and are used only for convenience of description and simplicity of description, and do not indicate or imply that the device or element so referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the present invention.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally formed; the connection can be mechanical connection, electrical connection or communication; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

The above-mentioned specific embodiments can not be regarded as the restriction to the protection scope of the present invention, to the technical personnel in this technical field, it is right that any replacement improvement or transformation that the embodiment of the present invention made all fall within the protection scope of the utility model.

The parts of the present invention not described in detail are the known techniques of those skilled in the art.

Claims (10)

1. An integrated synchronous hydraulic cylinder is characterized by comprising n cylinder barrel units, n-1 transition end covers, a front end cover, a rear end cover, a piston rod and n pistons; the rear port of the ith cylinder barrel unit and the front port of the (i + 1) th cylinder barrel unit are respectively connected with the front end face and the rear end face of the ith transition end cover, the front port of the 1 st cylinder barrel unit is connected with the rear end face of the front end cover, and the rear port of the nth cylinder barrel unit is connected with the front end face of the rear end cover; the n pistons are respectively arranged in the n cylinder barrel units, the n pistons are all sleeved on piston rods, and the piston rods penetrate through the n cylinder barrel units;

the front end cover is provided with a 1 st cartridge check valve mounting port, a 1 st cartridge overflow valve mounting port and an oil cavity A communicated with the oil cavity in the front side of the 1 st piston₁A mouth; an i +1 th cartridge check valve mounting port communicated with an oil cavity at the front side of the i +1 th piston, an i +1 th cartridge overflow valve mounting port and an A communicated with the oil cavity at the front side of the i +1 th piston are formed in the ith transition end cover_i+1A port, wherein i ∈ (1, n-1);

the side walls of each cylinder barrel unit, the transition end cover and the rear end cover are provided with an A-port oil way which is communicated with each other, and the A-port oil way is communicated with the oil cavity at the rear side of each piston; the rear end cover is provided with an A0 port, and the A0 port is communicated with an A port oil way;

the side walls of each cylinder barrel unit, the transition end cover and the rear end cover are provided with pre-charging oil ways which are communicated with each other, the pre-charging oil ways are communicated with oil cavities on the front sides of the pistons, and each one-way valve mounting opening is communicated with the pre-charging oil ways;

the side walls of each cylinder barrel unit, the transition end cover and the rear end cover are provided with T-port oil ways which are mutually communicated, the T-port oil ways are communicated with oil cavities at the front sides of the pistons, and each plug-in overflow valve mounting port is communicated with the T-port oil way; and the rear end cover is provided with a T port, and the T port is communicated with a T port oil way.

2. The integrated synchronous hydraulic cylinder according to claim 1, further comprising a synchronous control valve group and a pre-filled oil control valve group which are arranged on the rear end cover, wherein the synchronous control valve group comprises a three-position four-way solenoid valve, and the pre-filled oil control valve group comprises a two-position four-way solenoid valve, n inserted overflow valves and n inserted check valves;

a working oil port A of the three-position four-way electromagnetic valve is communicated with a port A0, and a working oil port B of the two-position four-way electromagnetic valve is communicated with a pre-charging oil way;

the n plug-in overflow valves are respectively plugged in the n plug-in overflow valve mounting openings, and the n plug-in check valves are respectively plugged in the plug-in check valve mounting openings.

3. The integrated synchronous hydraulic cylinder of claim 2, wherein the synchronous valve set further comprises a pilot operated check valve communicating between port a of the three-position, four-way valve and port a0 of the synchronous hydraulic cylinder.

4. The integrated synchronous hydraulic cylinder of claim 3, wherein the set of synchronous control valves further comprises a one-way throttle valve communicating between the pilot operated check valve and port A0 of the synchronous hydraulic cylinder.

5. The integrated synchronous hydraulic cylinder according to claim 2, wherein the pre-charge control valve set further comprises a pressure reducing valve, and the pressure reducing valve is communicated with the oil inlet P of the two-position four-way solenoid valve.

6. The integrated synchronous hydraulic cylinder according to claim 1, wherein the piston rod is assembled by n piston rod units, and n pistons are respectively sleeved on the n piston rod units.

7. The integrated synchronous hydraulic cylinder according to claim 6, wherein one end of each piston rod unit is provided with a threaded hole, the other end of each piston rod unit is provided with a reducing step, the piston is sleeved on the reducing step corresponding to the piston rod unit, the outer end of the reducing step is provided with an external thread, and the rear end of the ith piston rod unit is in fit connection with the front end of the (i + 1) th piston rod unit through the threaded hole and the external thread so as to clamp the ith piston between the two piston rod units.

8. The integrated synchronous hydraulic cylinder according to claim 6, wherein the hole in the middle of the piston through which the piston rod unit passes is a stepped hole.

9. The integrated synchronous hydraulic cylinder according to claim 1, wherein the front end cover, the cylinder unit, the transition end cover and the rear end cover are fastened and connected into a whole through a connecting rod.

10. A synchronous lifting system, which is characterized by comprising n actuating hydraulic cylinders, the synchronous hydraulic cylinder, the synchronous control valve group and the oil liquid pre-charging control valve group, which are disclosed in claim 3;

a of the synchronous hydraulic cylinder₁Mouth and A_i+1The ports are respectively and correspondingly communicated with rodless cavities of the n execution hydraulic cylinders through connecting pipelines, and rod cavities of the n execution hydraulic cylinders are respectively and correspondingly communicated with working oil ports B of the three-position four-way electromagnetic valve through connecting pipelines;

and an oil inlet P of the three-position four-way electromagnetic valve and an oil inlet P of the two-position four-way electromagnetic valve are both communicated with a hydraulic power source, and an oil return port T of the three-position four-way electromagnetic valve and an oil return port T of the two-position four-way electromagnetic valve are both communicated with an oil tank.

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