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CN106574640A - Hydraulic drive system for operating table - Google Patents

Hydraulic drive system for operating table Download PDF

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Publication number
CN106574640A
CN106574640A CN201480080898.6A CN201480080898A CN106574640A CN 106574640 A CN106574640 A CN 106574640A CN 201480080898 A CN201480080898 A CN 201480080898A CN 106574640 A CN106574640 A CN 106574640A
Authority
CN
China
Prior art keywords
oil
reversing valve
way
oil cylinder
cylinder
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CN201480080898.6A
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Chinese (zh)
Other versions
CN106574640B (en
Inventor
邓强泉
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nanjing Mindray Bio Medical Electronics Co Ltd
Original Assignee
Nanjing Mindray Bio Medical Electronics Co Ltd
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Publication of CN106574640A publication Critical patent/CN106574640A/en
Application granted granted Critical
Publication of CN106574640B publication Critical patent/CN106574640B/en
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Classifications

    • 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
    • F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
    • F15B11/16—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors
    • F15B11/22—Synchronisation of the movement of two or more servomotors
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61G—TRANSPORT, PERSONAL CONVEYANCES, OR ACCOMMODATION SPECIALLY ADAPTED FOR PATIENTS OR DISABLED PERSONS; OPERATING TABLES OR CHAIRS; CHAIRS FOR DENTISTRY; FUNERAL DEVICES
    • A61G13/00—Operating tables; Auxiliary appliances therefor
    • A61G13/02—Adjustable operating tables; Controls therefor
    • A61G13/08—Adjustable operating tables; Controls therefor the table being divided into different adjustable sections
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61G—TRANSPORT, PERSONAL CONVEYANCES, OR ACCOMMODATION SPECIALLY ADAPTED FOR PATIENTS OR DISABLED PERSONS; OPERATING TABLES OR CHAIRS; CHAIRS FOR DENTISTRY; FUNERAL DEVICES
    • A61G13/00—Operating tables; Auxiliary appliances therefor
    • A61G13/10—Parts, details or accessories
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61G—TRANSPORT, PERSONAL CONVEYANCES, OR ACCOMMODATION SPECIALLY ADAPTED FOR PATIENTS OR DISABLED PERSONS; OPERATING TABLES OR CHAIRS; CHAIRS FOR DENTISTRY; FUNERAL DEVICES
    • A61G13/00—Operating tables; Auxiliary appliances therefor
    • A61G13/10—Parts, details or accessories
    • A61G13/12—Rests specially adapted therefor; Arrangements of patient-supporting surfaces
    • A61G13/1205—Rests specially adapted therefor; Arrangements of patient-supporting surfaces for specific parts of the body
    • A61G13/1245—Knees, upper or lower legs
    • 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
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/30—Directional control
    • F15B2211/305—Directional control characterised by the type of valves
    • F15B2211/30505—Non-return valves, i.e. check valves
    • F15B2211/3051—Cross-check valves
    • 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
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/30—Directional control
    • F15B2211/305—Directional control characterised by the type of valves
    • F15B2211/3056—Assemblies of multiple valves
    • F15B2211/30565—Assemblies of multiple valves having multiple valves for a single output member, e.g. for creating higher valve function by use of multiple valves like two 2/2-valves replacing a 5/3-valve
    • F15B2211/3057—Assemblies of multiple valves having multiple valves for a single output member, e.g. for creating higher valve function by use of multiple valves like two 2/2-valves replacing a 5/3-valve having two valves, one for each port of a double-acting output member
    • 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
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/30—Directional control
    • F15B2211/31—Directional control characterised by the positions of the valve element
    • F15B2211/3138—Directional control characterised by the positions of the valve element the positions being discrete
    • 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
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/30—Directional control
    • F15B2211/315—Directional control characterised by the connections of the valve or valves in the circuit
    • F15B2211/31552—Directional control characterised by the connections of the valve or valves in the circuit being connected to an output member and a return line
    • F15B2211/31564—Directional control characterised by the connections of the valve or valves in the circuit being connected to an output member and a return line having multiple output members
    • 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
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/30—Directional control
    • F15B2211/32—Directional control characterised by the type of actuation
    • F15B2211/327—Directional control characterised by the type of actuation electrically or electronically
    • 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
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/40—Flow control
    • F15B2211/405—Flow control characterised by the type of flow control means or valve
    • F15B2211/40507—Flow control characterised by the type of flow control means or valve with constant throttles or orifices
    • 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
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/40—Flow control
    • F15B2211/415—Flow control characterised by the connections of the flow control means in the circuit
    • F15B2211/41527—Flow control characterised by the connections of the flow control means in the circuit being connected to an output member and a directional control valve
    • 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
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/70—Output members, e.g. hydraulic motors or cylinders or control therefor
    • F15B2211/705—Output members, e.g. hydraulic motors or cylinders or control therefor characterised by the type of output members or actuators
    • F15B2211/7051—Linear output members
    • F15B2211/7053—Double-acting output members
    • 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
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/70—Output members, e.g. hydraulic motors or cylinders or control therefor
    • F15B2211/71—Multiple output members, e.g. multiple hydraulic motors or cylinders
    • 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
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/70—Output members, e.g. hydraulic motors or cylinders or control therefor
    • F15B2211/71—Multiple output members, e.g. multiple hydraulic motors or cylinders
    • F15B2211/7114—Multiple output members, e.g. multiple hydraulic motors or cylinders with direct connection between the chambers of different actuators
    • F15B2211/7121—Multiple output members, e.g. multiple hydraulic motors or cylinders with direct connection between the chambers of different actuators the chambers being connected in series
    • 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
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/70—Output members, e.g. hydraulic motors or cylinders or control therefor
    • F15B2211/71—Multiple output members, e.g. multiple hydraulic motors or cylinders
    • F15B2211/7142—Multiple output members, e.g. multiple hydraulic motors or cylinders the output members being arranged in multiple groups
    • 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
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/70—Output members, e.g. hydraulic motors or cylinders or control therefor
    • F15B2211/78—Control of multiple output members
    • F15B2211/782—Concurrent control, e.g. synchronisation of two or more actuators

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fluid-Pressure Circuits (AREA)
  • Actuator (AREA)

Abstract

A hydraulic drive system for an operating table, the system comprising an oil supplying device for providing hydraulic oil, an oil returning device and an oil returning circuit assembly; the oil returning circuit assembly comprises two oil cylinders (261, 262), two reversing valve assemblies and two two-way hydraulic locks; a rodless cavity (2611, 2621) of each oil cylinder is connected to a working interface of the reversing valve assembly via a first oil path (31), and a rod cavity (2612, 2622) of each oil cylinder is connected to another working interface of the reversing valve assembly via a second oil path (32); an oil returning opening of each reversing valve assembly is connected to the oil returning device via an oil returning path (30); the oil returning path (30) is provided with an on-off control valve thereon; and the first oil path (31) and the second oil path (32) are subject to two-way on-off control via the two-way hydraulic lock. The system enables piston rods of the two oil cylinders (261, 262) to move independently and to move synchronously, thus simplifying a system structure, providing reliability and reducing cost.

Description

Hydraulic driving system for operating table Technical Field
The invention relates to a hydraulic driving system for an operating table.
 Background
The electro-hydraulic operating table is generally provided with a function of driving the double-leg plates through hydraulic control, so that not only can the left leg plate and the right leg plate independently move, but also the double-leg plates synchronously move; meanwhile, the device also requires low noise during action, stable and reliable control, high synchronous action precision and good synchronous performance. The operating table is a general name of the operating table and the operating bed.
The existing hydraulic control driving method for the double-leg plate of the electric hydraulic operating table comprises the following steps:
a) three four-way or five-way electromagnetic directional valves, three two-way hydraulic locks and two hydraulic controls are adopted
The left leg plate and the right leg plate act independently and the double leg plates act synchronously in a mode of connecting the left leg plate oil cylinder and the right leg plate oil cylinder in series by matching the one-way valve;
b) three groups of two-position two-way electromagnetic switch valves (each group comprises two-position two-way electromagnetic switches)
The valve) is matched with the two-position two-way electromagnetic switch valves, and the independent action of the left leg plate and the right leg plate and the synchronous action of the two leg plates are realized in a mode of connecting the left leg plate oil cylinder and the right leg plate oil cylinder in series;
c) two groups of two-position three-way electromagnetic directional valves (each group comprises two-position three-way electromagnetic directional valves) are matched with two-way hydraulic locks, a servo control system is formed by an angle sensor and a control unit on each leg plate, when synchronous action is needed, the angle deviation of the two leg plates needs to be fed back to the control unit quickly, and the control unit eliminates the asynchronous deviation of the action of the two legs in real time through a quick switch of a control electromagnetic valve to realize synchronous action; the independent motion of the left and right leg plates can also be realized.
 Disclosure of Invention
The invention provides a novel hydraulic driving system for an operating table.
The invention provides an operating table hydraulic driving system, which has an independent motion state and a synchronous motion state and comprises an oil supply device, an oil return device and an oil cylinder loop assembly, wherein the oil cylinder loop assembly comprises two oil cylinders, each oil cylinder is provided with a rodless cavity and a rod cavity with a piston rod, the oil cylinder loop assembly also comprises two reversing valve assemblies and two-way hydraulic locks, the oil cylinders, the reversing valve assemblies and the two-way hydraulic locks are in one-to-one correspondence, the rodless cavity of each oil cylinder is connected with one working interface of the reversing valve assembly through a first oil path, the rod cavity of each oil cylinder is connected with the other working interface of the reversing valve assembly through a second oil path, an oil inlet of each reversing valve assembly is connected with the oil supply device, and one oil return port of each reversing valve assembly is directly connected with the oil return device, the other oil return port of each reversing valve component is connected with the oil return device through an oil return path, the oil return path is provided with an on-off control valve, the first oil path and the second oil path corresponding to each oil cylinder are subjected to bidirectional on-off control through the corresponding bidirectional hydraulic lock, a rod cavity of one oil cylinder is connected with a rodless cavity of the other oil cylinder in series, and the on-off control valve enables the oil return path to be communicated in the independent movement state; and in the synchronous motion state, the on-off control valve stops the oil return oil way.
And each oil inlet of the two reversing valve components is connected with an oil supply device. One of the two oil return ports of each reversing valve component is connected with an oil return device, and the other oil return port is connected with the oil return device through an oil return oil way provided with an on-off control valve.
The independent movement and the synchronous movement of the piston rods of the two oil cylinders are realized through the coordinated control of all reversing valve assemblies, the two-way hydraulic lock and the on-off control valve.
Each reversing valve component comprises two-position three-way electromagnetic reversing valves and each two-position three-way electromagnetic reversing valve
The electromagnetic directional valve is provided with the oil inlet, the oil return port and the working interface.
Each two-position three-way electromagnetic directional valve and the on-off control valve are fixedly connected into a whole, thereby forming
A control assembly.
Each reversing valve component comprises a two-position five-way electromagnetic reversing valve with one oil inlet
The port, two work interfaces and two oil return ports.
Each two-way hydraulic lock comprises two hydraulic control one-way valves which are respectively provided with a hydraulic oil cylinder
The hydraulic control check valve of the second oil way is arranged under the oil pressure control of the first oil way, and the hydraulic control check valve of the first oil way is arranged under the oil pressure control of the second oil way.
The bidirectional hydraulic lock can realize the forward and reverse conduction and the reverse cut-off of the first oil circuit and the second oil circuit.
The on-off control valve is a two-position two-way electromagnetic switch valve or a two-position three-way electromagnetic directional valve.
The effective action area of the rodless cavity of one oil cylinder is the same as that of the rod cavity of the other oil cylinder.
Each oil cylinder corresponds to one movable part of the operating table, and the action of the movable parts of the operating table is controlled in a combined manner through logic control of all parts of the hydraulic driving system. Moving parts such as leg plates or other parts requiring synchronized, individual control.
And throttling devices capable of adjusting flow are arranged on the first oil way and the second oil way. Throttle device
Such as a hollow head throttle bolt, a throttle speed regulating valve or other devices capable of realizing flow regulation, thereby realizing the regulation of the movement speed of the piston rod and the movement speed of any action of the operating bed.
An operating table hydraulic driving system has an independent motion state and a synchronous motion state, and comprises an oil supply device, an oil return device and an oil cylinder loop assembly, wherein the oil cylinder loop assembly can provide hydraulic oil, the oil cylinder loop assembly comprises two oil cylinders, each oil cylinder is provided with a rodless cavity and a rod cavity with a piston rod, the oil cylinder loop assembly further comprises two reversing valve assemblies and two-way hydraulic locks, the oil cylinders, the reversing valve assemblies and the two-way hydraulic locks are in one-to-one correspondence, each reversing valve assembly comprises two-position three-way electromagnetic reversing valves, and each two-position three-way electromagnetic reversing valve is provided with an oil inlet, an oil return port and a working interface; each oil inlet is connected with the oil supply device; for each reversing valve component, the working interface of one two-position three-way electromagnetic reversing valve is connected with the rodless cavity of the corresponding oil cylinder through a first oil path, and the working interface of the other two-position three-way electromagnetic reversing valve is connected with the rod cavity of the corresponding oil cylinder through a second oil path; the two oil cylinders are respectively a left oil cylinder and a right oil cylinder, an oil return port of the two-position three-way electromagnetic reversing valve connected with the rodless cavity of the right oil cylinder is directly connected with the oil return device, and an oil return port of the two-position three-way electromagnetic reversing valve connected with the rod cavity of the right oil cylinder is connected with the oil return device through an oil return oil way; the oil return port of the two-position three-way electromagnetic reversing valve connected with the rodless cavity of the left oil cylinder is directly connected with the oil return device through the oil return oil way, and the oil return port of the two-position three-way electromagnetic reversing valve connected with the rod cavity of the left oil cylinder is directly connected with the oil return device; the oil return oil path is provided with an on-off control valve, the first oil path and the second oil path corresponding to each oil cylinder are subjected to bidirectional on-off control by the corresponding bidirectional hydraulic lock, the rod cavity of the right oil cylinder is connected with the rodless cavity of the left oil cylinder in series, and the on-off control valve enables the oil return oil path to be conducted in the single motion state; and in the synchronous motion state, the on-off control valve stops the oil return oil way. The effective active area of the rodless cavity of the right cylinder can be equal to the effective active area of the rod cavity of the left cylinder.
In an alternative mode, an oil return port of the two-position three-way electromagnetic reversing valve connected with the rodless cavity of the left oil cylinder is directly connected with the oil return device, and an oil return port of the two-position three-way electromagnetic reversing valve connected with the rod cavity of the left oil cylinder is connected with the oil return device through an oil return oil way; and the oil return port of the two-position three-way electromagnetic reversing valve connected with the rodless cavity of the right oil cylinder is connected with the oil return device through the oil return oil way, and the oil return port of the two-position three-way electromagnetic reversing valve connected with the rod cavity of the right oil cylinder is directly connected with the oil return device. The effective active area of the rodless cavity of the left cylinder can be equal to the effective active area of the rod cavity of the right cylinder.
The invention has the beneficial effects that:
1) the single motion control and the synchronous motion control of the two oil cylinder piston rods can be realized only by arranging two reversing valve assemblies, two bidirectional hydraulic locks and one on-off control valve, the structure of a hydraulic driving system is simplified, the reliability is improved, and the cost can be reduced.
2) Each two-position three-way electromagnetic directional valve and the on-off control valve can be fixed into a whole to form an integrated module, so that the structure of the hydraulic driving system is more compact, the size is reduced, and the installation and the overall layout of the whole system are facilitated.
Drawings
FIG. 1 is a schematic block diagram of a first embodiment of an operating table hydraulic drive system;
FIG. 2 is a schematic diagram of the construction of a second embodiment of the hydraulic drive system for an operating table;
fig. 3 and 4 are a right side view and a front view of the two-position two-way electromagnetic switch valve and the two-position three-way electromagnetic directional valve of the first embodiment after being combined into a whole;
fig. 5 and 6 are a right side view and a front view of the two-position two-way electromagnetic switch valve and the two-position three-way electromagnetic directional valve of the second embodiment after being combined into one body.
Detailed Description
As shown in fig. 1 and 2, the hydraulic drive system for an operating table includes an oil supply device, an oil return device, and a cylinder circuit assembly. The oil supply device can supply hydraulic oil. The oil return device can recover hydraulic oil. The cylinder loop assembly comprises two cylinders 261 and 262, two reversing valve assemblies and two bidirectional hydraulic locks, and the cylinders, the reversing valve assemblies and the bidirectional hydraulic locks correspond to one another. The cylinder has rodless chambers 2611, 2621 and rodless chambers 2612, 2622 with piston rods 2613, 2623. The reversing valve assembly may have one or two oil inlets, two oil return ports, and two working ports, one of which is connected to the rodless chambers 2611, 2621 through a first oil passage 31, and the other of which is connected to the rod chambers 2612, 2622 through a second oil passage 32. The first oil path 31 and the second oil path 32 are controlled by a bidirectional hydraulic lock to make the first and second oil paths capable of realizing forward and reverse flows and reverse cut-off of hydraulic oil. The oil inlet of each reversing valve component is connected with the oil supply device, one oil return port of each reversing valve component is directly connected with the oil return device, and the other oil return port of each reversing valve component is connected with the oil return device through an oil return path 30. The oil return path 30 is controlled by an on-off control valve to be on and off, and when the oil return path is conducted, hydraulic oil can flow through the oil return path 30; at the time of the cutoff, the hydraulic oil cannot flow through the oil return passage 30.
Each reversing valve component, each bidirectional hydraulic lock and the on-off control valve are coordinately controlled by a main control device, so that the hydraulic driving system of the operating table has an independent motion state and a synchronous motion state, and the two motion states can be mutually switched.
In the state of independent movement, the on-off control valve makes the oil return path 30 conductive. In an independent motion state, the two oil cylinders can be independently controlled. Taking one of the oil cylinders as an example, when the piston rod 2613 needs to extend, hydraulic oil of the oil supply device flows into the rodless cavity 2611 of the oil cylinder 261 through the first oil path 31, and hydraulic oil in the rod cavity 2612 flows back to the oil return device through the second oil path 32 and the oil return path 30; when the piston rod 2613 needs to retract, hydraulic oil of the oil supply device flows into the rod cavity 2612 of the oil cylinder 261 through the second oil path 32, and hydraulic oil in the rod-free cavity 2611 flows back to the oil return device through the first oil path 31.
In the synchronous motion state, the on-off control valve shuts off the oil return path 30. In the synchronous motion state, synchronous control of the two oil cylinders 261, 262 can be realized. When the piston rods 2613 and 2623 need to extend synchronously, the hydraulic oil of the oil supply device flows into the rodless cavity 2611 of one oil cylinder 261 through one first oil path 31, the hydraulic oil in the rod cavity 2612 of the oil cylinder 261 flows into the rodless cavity 2621 of the other oil cylinder 262 through the second oil path 32 and the other first oil path 31, and the hydraulic oil in the rod cavity 2622 of the other oil cylinder flows back to the oil return device; when the piston rod needs to retract synchronously, the hydraulic oil of the oil supply device flows into the rod cavity 2622 of one oil cylinder 262 through one second oil path 32, the hydraulic oil in the rod-free cavity 2621 of the oil cylinder 262 flows into the rod cavity 2612 of the other oil cylinder 261 through one first oil path 31 and the other second oil path 32, and the hydraulic oil in the rod-free cavity 2611 of the other oil cylinder 261 flows back to the oil return device.
As shown in fig. 1, a first embodiment of an operating table hydraulic drive system is shown.
The hydraulic driving system of the operating table comprises an oil supply device, an oil return device, two oil cylinders 261 and 262, two groups of two-position three-way electromagnetic directional valves and two-way hydraulic locks. The oil supply device is capable of supplying hydraulic oil, and has an oil outlet P. The oil return device, such as an oil tank, can recover hydraulic oil, and has an oil port T. The cylinders 261, 262 have rodless chambers 2611, 2621 and rod chambers 2612, 2622 with piston rods 2613, 2623. The set of two-position three-way electromagnetic directional valves corresponding to the oil cylinder 261 includes two-position three-way electromagnetic directional valves 202, 203, and the set of two-position three-way electromagnetic directional valves corresponding to the oil cylinder 262 includes two-position three-way electromagnetic directional valves 204, 205. Each two-position three-way electromagnetic directional valve is provided with an oil inlet, an oil return port and a working interface. Of the two working ports of each group of two-position three-way electromagnetic valves, one working port is connected with rodless cavities 2611 and 2621 of the oil cylinder through a first oil path 31, and the other working port is connected with rod cavities 2612 and 2622 of the oil cylinder through a second oil path 32. Two oil inlets of each group of two-position three-way electromagnetic directional valves are connected with an oil supply device, one oil return port of two oil return ports of each group of two-position three-way electromagnetic directional valves is directly connected with an oil return device, and the other oil return port of the two oil return ports of each group of two-position three-way electromagnetic directional valves is connected with the oil return device through an oil return oil way 30. The oil return path is provided with a two-position two-way electromagnetic switch valve 201.
Each of the two-way hydraulic locks includes two pilot operated check valves 221, 222, and the two pilot operated check valves 221, 222 are respectively disposed on the first oil passage 31 and the second oil passage 32. The hydraulic pressure of the first oil passage 31 controls the pilot check valve 222 of the second oil passage 32, and the hydraulic pressure of the second oil passage 32 controls the pilot check valve 221 of the first oil passage 31.
The two oil cylinders can respectively control the left leg plate and the right leg plate of the operating table. Hydraulic oil is output from the oil outlet P and is communicated with oil inlets of the two-position three-way electromagnetic directional valves 202, 203, 204 and 205, a filter screen is arranged at the oil inlet of the two-position three-way electromagnetic directional valve and can filter the hydraulic oil entering the valve core, and hydraulic return oil is communicated with oil return ports of the two-position two-way electromagnetic switch valve 201 and the two-position three-way electromagnetic directional valves 202 and 204 and flows back to an oil tank through the oil port T; the rising and falling of the left and right leg plates are driven by the extending and retracting actions of the corresponding leg plate oil cylinder piston rods respectively.
The independent control and driving method of the left leg plate and the right leg plate comprises the following steps:
1. the left leg plate rises: the two-position three-way electromagnetic directional valve 202 is electrified, at the moment, the valve core is in a left working function, hydraulic oil opens the hydraulic control one-way valves 221 and 222 through the valve core, flows through the throttling hole 241 and then enters the rodless cavity 2611 of the left leg plate oil cylinder 261, meanwhile, because the hydraulic control one-way valve 222 is opened, the hydraulic oil entering the rodless cavity 2611 of the oil cylinder 261 can drive the piston rod 2613 to extend and move, the hydraulic oil in the rod cavity 2612 of the oil cylinder 261 flows through the hydraulic control one-way valve 222 and then flows out through the left working function of the two-position three-way electromagnetic directional valve 203, meanwhile, the two-position two-way electromagnetic switch valve 201 is electrified, the hydraulic oil flows back to the oil tank through the oil.
2. Descending the left leg plate: the two-position three-way electromagnetic directional valve 203 is electrified, at the moment, the valve core is in a right working function, hydraulic oil opens the hydraulic control one-way valves 222 and 221 through the valve core and then enters the rod cavity 2612 of the left leg plate oil cylinder 261, meanwhile, because the hydraulic control one-way valve 221 is opened, the hydraulic oil entering the rod cavity 2612 of the oil cylinder 261 can drive the piston rod 2613 to retract, the hydraulic oil in the rodless cavity 2611 of the oil cylinder 261 sequentially flows through the throttle hole 241 and the hydraulic control one-way valve 221, and flows out through the right working function of the two-position three-way electromagnetic directional valve 202 and flows back to the oil tank through the oil port T to form a complete.
3. The right leg plate rises: the two-position three-way electromagnetic directional valve 205 is powered on, at the moment, the valve core is in a right working function, hydraulic oil opens the hydraulic control one-way valves 224 and 223 through the valve core, flows through the throttle hole 242 and then enters the rodless cavity 2621 of the right leg plate oil cylinder 262, meanwhile, because the hydraulic control one-way valve 223 is opened, hydraulic oil entering the rodless cavity 2621 of the oil cylinder 262 can drive the piston rod 2623 to extend, hydraulic oil in the rod cavity 2622 of the oil cylinder flows through the hydraulic control one-way valve 223 and then flows out through the right working function of the two-position three-way electromagnetic directional valve 204 and flows back to the oil tank through the oil port T, and a.
4. Descending the right leg plate: the two-position three-way electromagnetic directional valve 204 is electrified, at the moment, the valve core is in a left working function, hydraulic oil opens the hydraulic control one-way valves 223 and 224 through the valve core and then enters the rod cavity 2622 of the left leg plate oil cylinder 262, meanwhile, because the hydraulic control one-way valve 224 is opened, the hydraulic oil entering the rod cavity 2622 of the oil cylinder 262 can drive the piston rod 2623 to retract, the hydraulic oil in the rodless cavity 2621 of the oil cylinder sequentially flows through the throttle hole 242, the hydraulic control one-way valve 224 and the left working function of the two-position three-way electromagnetic directional valve 205, and meanwhile, the two-position two-way electromagnetic switch valve 201 is electrified, and the hydraulic oil flows back to the oil tank through the oil port T through the right.
Secondly, the synchronous control and driving method of the left leg plate and the right leg plate is as follows:
the effective active area of the rod chamber 2612 of the left leg plate cylinder 261 is equal to the effective active area of the rodless chamber 2621 of the right leg plate cylinder 262.
1. The two leg plates rise synchronously: the two-position three-way electromagnetic directional valve 202 is powered on, at the moment, the valve core of the two-position three-way electromagnetic directional valve is in a left working function, hydraulic oil opens the hydraulic control one-way valves 221 and 222 through the valve core, flows through the throttle hole 241 and then enters the rodless cavity 2611 of the left leg plate oil cylinder 261, at the same time, because the hydraulic control one-way valve 222 is opened, the hydraulic oil entering the rodless cavity 2611 of the oil cylinder 261 can drive the piston rod 2613 to extend and move, at the same time, the two-position two-way electromagnetic directional valve 201 is powered off, after the hydraulic oil flowing out of the rod cavity 2612 flows through the left working function of the two-position three-way electromagnetic directional valve 203, the hydraulic oil cannot flow through the right working function of the two-position two-way electromagnetic directional valve 201 and reach the oil port T, only can open the hydraulic control one-way valves 224 and 223 through the throttle hole 242 and then enters the rodless cavity 2621 of the right leg plate oil cylinder 262, and because the hydraulic control one, hydraulic oil in a rod cavity 2622 of the oil cylinder flows through the hydraulic control one-way valve 223, flows out through a right working machine of the two-position three-way electromagnetic directional valve 204 and flows back to the oil tank through an oil port T to form a complete loop; the rod cavity 2612 of the left leg plate oil cylinder 261 is connected with the rodless cavity 2621 of the right leg plate oil cylinder 262 in series, and the right leg plate oil cylinder is driven by the left leg plate oil cylinder to synchronously extend and move.
2. The two leg plates descend synchronously: the two-position three-way electromagnetic directional valve 204 is powered on, at the moment, the valve core is in a right working function, hydraulic oil opens the hydraulic control one-way valves 223 and 224 through the valve core and then enters the rod cavity 2622 of the right leg plate cylinder 262, meanwhile, because the hydraulic control one-way valve 224 is opened, the hydraulic oil entering the rod cavity 2622 of the cylinder 262 can drive the piston rod 2623 to retract, after the hydraulic oil flowing out of the rodless cavity 2621 sequentially flows through the throttle hole 242, the hydraulic control one-way valve 224 and the left working function of the two-position three-way electromagnetic directional valve 205, because the two-position two-way electromagnetic switch valve 201 is powered off, the hydraulic oil can not reach the oil port T through the right working function of the two-position two-way electromagnetic switch valve 201, and only can flow through the left working function of the two-position three-way electromagnetic directional valve 203 to open the hydraulic control one-way valves 222 and 221 and then flow through the throttle hole 241 and enter the rod cavity 2612 of the left leg plate cylinder 261, and because the one-way valve, hydraulic oil in a rodless cavity 2611 of the oil cylinder 261 sequentially flows through the throttling hole 241 and the hydraulic control one-way valve 221, then flows out through a right working machine of the two-position three-way electromagnetic directional valve 202, and flows back to the oil tank through the oil port T to form a complete loop; the rodless cavity 2621 of the right leg plate cylinder 262 is connected in series with the rod cavity 2612 of the left leg plate cylinder 261, and the left leg plate cylinder is driven by the right leg plate cylinder to synchronously retract.
Fig. 2 shows a second embodiment of the hydraulic operating table drive system, which differs from the first embodiment mainly in that: when the two leg plates move synchronously, the effective action area of the rodless cavity 2611 of the left leg plate oil cylinder 261 is equal to the effective action area of the rod cavity 2622 of the right leg plate oil cylinder 262, the left leg plate oil cylinder is driven by the right leg plate oil cylinder to synchronously extend and move, and the right leg plate oil cylinder is driven by the left leg plate oil cylinder to synchronously retract.
The logic control method can realize the independent movement of any leg plate or the synchronous movement of two leg plates of the operating bed, and if the swing position (or any position state) of the operating bed is to be kept, only the two-position three-way electromagnetic reversing valve of the hydraulic circuit of the leg plate oil cylinder driving the motion is required to be in a power-off state, and at the moment, the hydraulic control one-way valve is in a reverse cut-off state, so that hydraulic oil in a rodless cavity and a rod cavity of the leg plate oil cylinder can be in a sealed closed cavity and can flow everywhere, and the swing position state of the leg plate of the operating bed can be stably and reliably kept.
As shown in fig. 3 to 6, the oil pipe joint 10 and the oil pipe are used to connect the oil cylinder and the valve or the valve and the hydraulic pump, the two-position two-way electromagnetic switch valve 201 and the two-position three-way electromagnetic directional valves 202, 203, 204, 205 are combined to form the leg plate control valve group of the operating bed, and the screws 14, 16 are used to connect and fasten the valve group.
For the hydraulic control driving system of the operating table, two groups of two-position three-way electromagnetic directional valves (each group comprises two-position three-way electromagnetic directional valves) and two-way hydraulic locks (each two-way hydraulic lock consists of two hydraulic control one-way valves) are adopted, and a two-position two-way electromagnetic switch valve is matched, so that independent action and synchronous action of a left leg plate and a right leg plate are realized in a mode of connecting the left leg plate and the right leg plate in series. The motion speed of the leg plate of the operating table can be realized by controlling the output flow of an oil supply device (such as a hydraulic pump), and also can be realized by arranging a throttle speed regulating valve or the size of a throttle hole of a blank throttle bolt on an oil cylinder loop. The working pressure of the leg plate of the operating table can be realized by a hydraulic pump with an overflow valve.
For the hydraulic control driving system of the operating table, each group of two-position three-way electromagnetic directional valves can be replaced by one two-position five-way electromagnetic directional valve, and five interfaces of the two-position three-way electromagnetic directional valves can be respectively connected with a first oil path, a second oil path, an oil supply device, an oil return device and an on-off control valve. The on-off control valve can be a switch valve, such as a two-position two-way electromagnetic switch valve; or a reversing valve, such as a two-position three-way electromagnetic reversing valve.
The foregoing is a more detailed description of the present invention that is presented in conjunction with specific embodiments, and the practice of the invention is not to be considered limited to those descriptions. It will be apparent to those skilled in the art that a number of simple derivations or substitutions can be made without departing from the inventive concept.

Claims (12)

  1. An operating table hydraulic drive system has an independent motion state and a synchronous motion state, and comprises an oil supply device capable of providing hydraulic oil, an oil return device and an oil cylinder loop assembly, wherein the oil cylinder loop assembly comprises two oil cylinders, each oil cylinder is provided with a rodless cavity and a rod cavity with a piston rod, the operating table hydraulic drive system is characterized in that the oil cylinder loop assembly further comprises two reversing valve assemblies and two-way hydraulic locks, the oil cylinders, the reversing valve assemblies and the two-way hydraulic locks are in one-to-one correspondence, the rodless cavity of each oil cylinder is connected with one working interface of the reversing valve assembly through a first oil path, the rod cavity of each oil cylinder is connected with the other working interface of the reversing valve assembly through a second oil path, an oil inlet of each reversing valve assembly is connected with the oil supply device, and one oil return port of each reversing valve assembly is directly connected with the oil, the other oil return port of each reversing valve component is connected with the oil return device through an oil return path, the oil return path is provided with an on-off control valve, the first oil path and the second oil path corresponding to each oil cylinder are subjected to bidirectional on-off control through the corresponding bidirectional hydraulic lock, a rod cavity of one oil cylinder is connected with a rodless cavity of the other oil cylinder in series, and the on-off control valve enables the oil return path to be communicated in the independent movement state; and in the synchronous motion state, the on-off control valve stops the oil return oil way.
  2. The operating table hydraulic drive system of claim 1 wherein each said reversing valve assembly includes two-position, three-way solenoid reversing valves, each said two-position, three-way solenoid reversing valve having one said oil inlet, one said oil return and one said work interface.
  3. The operating table hydraulic drive system of claim 2 wherein each of said two-position, three-way solenoid directional valves and on-off control valves are fixedly connected together.
  4. The operating table hydraulic drive system of claim 1 wherein each said reversing valve assembly comprises a two-position, five-way solenoid reversing valve.
  5. The operating table hydraulic drive system according to claim 1, wherein each of the two-way hydraulic locks includes two pilot operated check valves, the two pilot operated check valves are respectively provided in the first oil passage and the second oil passage, the hydraulic pressure of the first oil passage controls the pilot operated check valve provided in the second oil passage, and the hydraulic pressure of the second oil passage controls the pilot operated check valve provided in the first oil passage.
  6. The operating table hydraulic drive system of claim 1 wherein the on-off control valve is a two-position two-way solenoid switch valve or a two-position three-way solenoid directional valve.
  7. The operating table hydraulic drive system of claim 1 wherein the effective active area of the rodless chamber of one of said cylinders is the same as the effective active area of the rod chamber of the other of said cylinders.
  8. The operating table hydraulic drive system of claim 1, wherein the first and second fluid paths each have a flow restriction capable of regulating flow.
  9. An operating table hydraulic driving system has an independent motion state and a synchronous motion state, and comprises an oil supply device, an oil return device and an oil cylinder loop assembly, wherein the oil cylinder loop assembly can provide hydraulic oil, the oil cylinder loop assembly comprises two oil cylinders, each oil cylinder is provided with a rodless cavity and a rod cavity with a piston rod, the operating table hydraulic driving system is characterized in that the oil cylinder loop assembly further comprises two reversing valve assemblies and two-way hydraulic locks, the oil cylinders, the reversing valve assemblies and the two-way hydraulic locks are in one-to-one correspondence, each reversing valve assembly comprises two-position three-way electromagnetic reversing valves, and each two-position three-way electromagnetic reversing valve is provided with an oil inlet, an oil return port and a; each oil inlet is connected with the oil supply device; for each reversing valve component, the working interface of one two-position three-way electromagnetic reversing valve is connected with the rodless cavity of the corresponding oil cylinder through a first oil path, and the working interface of the other two-position three-way electromagnetic reversing valve is connected with the rod cavity of the corresponding oil cylinder through a second oil path; the two oil cylinders are respectively a left oil cylinder and a right oil cylinder, an oil return port of the two-position three-way electromagnetic reversing valve connected with the rodless cavity of the left oil cylinder is directly connected with the oil return device, and an oil return port of the two-position three-way electromagnetic reversing valve connected with the rod cavity of the left oil cylinder is connected with the oil return device through an oil return oil way; the oil return port of the two-position three-way electromagnetic reversing valve connected with the rodless cavity of the right oil cylinder is connected with the oil return device through the oil return oil way, and the oil return port of the two-position three-way electromagnetic reversing valve connected with the rod cavity of the right oil cylinder is directly connected with the oil return device; the oil return oil path is provided with an on-off control valve, the first oil path and the second oil path corresponding to each oil cylinder are subjected to bidirectional on-off control by the corresponding bidirectional hydraulic lock, a rod cavity of the left oil cylinder is connected with a rodless cavity of the right oil cylinder in series, and the on-off control valve enables the oil return oil path to be conducted in the single motion state; and in the synchronous motion state, the on-off control valve stops the oil return oil way.
  10. The operating table hydraulic drive system of claim 9 wherein the effective active area of the left cylinder rod chamber is equal to the effective active area of the right cylinder rodless chamber.
  11. An operating table hydraulic driving system has an independent motion state and a synchronous motion state, and comprises an oil supply device, an oil return device and an oil cylinder loop assembly, wherein the oil cylinder loop assembly can provide hydraulic oil, the oil cylinder loop assembly comprises two oil cylinders, each oil cylinder is provided with a rodless cavity and a rod cavity with a piston rod, the operating table hydraulic driving system is characterized in that the oil cylinder loop assembly further comprises two reversing valve assemblies and two-way hydraulic locks, the oil cylinders, the reversing valve assemblies and the two-way hydraulic locks are in one-to-one correspondence, each reversing valve assembly comprises two-position three-way electromagnetic reversing valves, and each two-position three-way electromagnetic reversing valve is provided with an oil inlet, an oil return port and a; each oil inlet is connected with the oil supply device; for each reversing valve component, the working interface of one two-position three-way electromagnetic reversing valve is connected with the rodless cavity of the corresponding oil cylinder through a first oil path, and the working interface of the other two-position three-way electromagnetic reversing valve is connected with the rod cavity of the corresponding oil cylinder through a second oil path; the two oil cylinders are respectively a left oil cylinder and a right oil cylinder, an oil return port of the two-position three-way electromagnetic reversing valve connected with the rodless cavity of the right oil cylinder is directly connected with the oil return device, and an oil return port of the two-position three-way electromagnetic reversing valve connected with the rod cavity of the right oil cylinder is connected with the oil return device through an oil return oil way; the oil return port of the two-position three-way electromagnetic reversing valve connected with the rodless cavity of the left oil cylinder is directly connected with the oil return device through the oil return oil way, and the oil return port of the two-position three-way electromagnetic reversing valve connected with the rod cavity of the left oil cylinder is directly connected with the oil return device; the oil return oil path is provided with an on-off control valve, the first oil path and the second oil path corresponding to each oil cylinder are subjected to bidirectional on-off control by the corresponding bidirectional hydraulic lock, the rod cavity of the right oil cylinder is connected with the rodless cavity of the left oil cylinder in series, and the on-off control valve enables the oil return oil path to be conducted in the single motion state; and in the synchronous motion state, the on-off control valve stops the oil return oil way.
  12. The operating table hydraulic drive system of claim 11 wherein the effective active area of the right cylinder rod chamber is equal to the effective active area of the left cylinder rodless chamber.
CN201480080898.6A 2014-10-23 2014-10-23 Operating table fluid power system Active CN106574640B (en)

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CN115342091B (en) * 2021-05-12 2024-11-05 哈威油液压技术(无锡)有限公司 Hydraulic control system
CN113983015A (en) * 2021-10-12 2022-01-28 中国煤炭科工集团太原研究院有限公司 Hydraulic control system and method for double cutting arms of heading machine
CN113983015B (en) * 2021-10-12 2024-04-12 中国煤炭科工集团太原研究院有限公司 Hydraulic control system and method for double cutting arms of heading machine
WO2024066270A1 (en) * 2022-09-26 2024-04-04 三一海洋重工有限公司 Oil cylinder system, boom and crane

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CN106574640B (en) 2018-07-31
EP3211249A1 (en) 2017-08-30

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