JPH0722246Y2 - Table lifting hydraulic mechanism - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a table lifting hydraulic mechanism such as an X-ray CT, and more particularly to a table lifting hydraulic mechanism that has improved workability when a hydraulic device fails.

(Prior Art) A hydraulic device is used as a table elevating mechanism for elevating a table on which a subject such as an X-ray CT is placed to move it to a predetermined position, and lowering the table after completion of imaging or the like. ing.

(Problems to be solved by the invention) In a table lifting hydraulic mechanism using this hydraulic device,
If the hydraulic pump-related malfunction causes the table to descend to the lowermost position, it becomes impossible to remove the table cover, which makes it impossible to repair the hydraulic system.

The present invention has been made in view of the above points, and an object thereof is to repair the hydraulic system by moving the table even when the table lifting operation mechanism fails to move the table due to a failure of the hydraulic pump. It is to realize a table lifting hydraulic mechanism that can perform.

(Means for Solving the Problems) In the present invention for solving the above problems, the oil sent from the hydraulic pump through the check valve is injected into the cylinder to raise the table, and the oil for the 2-position 2-port switching valve is used. In a table lifting hydraulic mechanism that opens a passage to let oil flow out from the table lifting cylinder and lowers the table, an oil direction control unit that is connected to an oil chamber of the cylinder and can supply oil to at least the cylinder, It is characterized by comprising oil circulation means connected to the direction control means, and connection means attached to the end of the oil circulation means and connectable to a gantry operating hydraulic pump mechanism.

(Function) When oil cannot be circulated to the table lifting cylinder due to a failure of the hydraulic pump or the like, the gantry operation hydraulic pump mechanism is connected by the connecting means, and the table is lifted through the oil circulating means and the direction control means. Add oil to the cylinder. Oil can be discharged depending on the type of the direction control means.

Embodiment An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a hydraulic circuit diagram of an embodiment of the present invention. In the figure, reference numeral 1 is a table elevating cylinder for elevating a table on which a subject is lying down to a predetermined position and lowering it to the original position. The table is elevated when oil is injected. Reference numeral 2 denotes a motor-controlled constant-capacity hydraulic pump that is a hydraulic pressure generation source for operating the table lifting cylinder 1, and sucks up oil from which dust and the like have been removed from an oil tank 3 by a suction filter 4 and sends it out. Reference numeral 5 is a check valve that functions to allow oil to pass through in the direction of injecting oil into the table lifting cylinder 1 and to prevent oil from flowing in the opposite direction in which oil flows out of the table lifting cylinder 1. 6 is adjusted so as to operate at a constant pressure, and in order to prevent the hydraulic pressure of the table lifting cylinder 1 from rising above a certain value when any abnormality occurs, the adjusted constant pressure is adjusted. It is a relief valve that prevents the pressure from rising to the above pressure and operates when it exceeds a certain pressure to return the oil to the oil tank 3 to limit the hydraulic pressure supplied to the table lifting cylinder 1. In the normal position, 7 is a check valve that closes the oil passage from the table lifting cylinder 1 to the oil tank 3, and when the table is lowered, it is operated by an electromagnet to open the oil passage from the table lifting cylinder 1 to the oil tank 3. It is a solenoid valve for returning oil from the table lifting cylinder 1 to the oil tank 3 when the table is opened and the table is lowered by its own weight. Reference numeral 8 denotes a throttle valve for adjusting the flow rate of the oil flowing back to the oil tank 3 to adjust the descending speed of the table lifting cylinder.

A check valve 9 is connected to the hydraulic circuit of the table lifting cylinder 1 in the same direction as the throttle valve 5 on the oil chamber side of the table cylinder 1 by a joint 10, and a joint 11 is attached to the other end of the input port. Hose 12 is connected.

Reference numeral 20 denotes a gantry operation hydraulic pump mechanism that injects oil into the cylinder to cause the gantry to perform a tilt operation, and is connected to a solenoid valve 22 by a joint 21. The joint 21 connected to the solenoid valve 22 is removed as necessary and connected to the joint 11.

Next, the operation of the embodiment configured as described above will be described.
When raising the table, the hydraulic pump 2 rotates,
Oil is sucked up from the oil tank 3 through the suction filter 4 and sent out. The oil sent out passes through the check valve 5 and is injected into the table lifting cylinder 1 to lift the table. When the hydraulic pressure of the oil supplied from the hydraulic pump 2 rises too much, the relief valve 6 allows the oil to escape to the oil tank 3 to prevent the hydraulic pressure from rising. When lowering the table, when the hydraulic pump 2 is stopped and the solenoid valve 7 is operated, the solenoid valve 7 moves from the normal position to the oil passage position, and to the oil tank 3 injected into the table lifting cylinder 1. Open the passage. The oil in the table lifting cylinder 1 is discharged by the weight of the table and returned to the oil tank 3 through the solenoid valve 7. The throttle valve 8 controls the descending speed of the table by controlling the oil flow rate.

In this hydraulic system, if the solenoid valve 7 is operated to lower the table to the lowermost end when the hydraulic pump 2 is out of order, the table cover cannot be removed, and therefore the hydraulic system cannot be repaired. Happens. At this time, the joint 21 connecting the gantry operation hydraulic pump mechanism 20 and the solenoid valve 22 is removed, and the end of the hose 12 of the check valve 9 connected to the oil chamber side of the table lifting cylinder 1 is removed. Connect to fitting 11. After connecting in this way, the hydraulic pump mechanism 20 for gantry operation is operated to send oil to the table lifting cylinder 1 via the check valve 9 to lift the table. In this way, the table cover can be removed and the hydraulic system can be repaired.

As described above, according to the apparatus of the present embodiment, even if the table is lowered to the bottom end when the pump mechanism fails, one maintenance person can safely and easily perform the repair work. . The components necessary for this purpose are only the joint 10, the joint 11, the check valve 9 and the hose 12, which can be inexpensively installed.

The present invention is not limited to the above embodiment. FIG. 2 is a hydraulic circuit diagram of another embodiment of the present invention. In the figure, the same reference numerals are used for the same parts as in FIG.
In the figure, 13 is a joint 10 on the oil chamber side of the table lifting cylinder 1.
With the solenoid valve connected together with the outlet port of the check valve 9, the hose 15 terminated in the joint 14 is connected to the outlet port of the solenoid valve 13. A joint 23 connects the hydraulic pump mechanism 20 for gantry operation and the tank port of the solenoid valve 22, and is connected to the joint 14 when necessary.

In the above embodiment, if the joint 23 is removed and connected to the joint 14 and the solenoid valve 13 is operated, the oil from the table lifting cylinder 1 is drained through the solenoid valve 13, the hose 15, the joint 14 and the joint 23. It can be oiled and can be lowered as well as raised on the table. In this embodiment, in addition to the parts of the previous embodiment, the solenoid valve 13, the hose 15, and the joint 14 are required.

(Effect of the invention) As described in detail above, even if the table does not move due to a failure of the hydraulic pump system by adding a few parts,
It can be easily repaired by one maintenance person, which has a great practical effect.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a hydraulic circuit diagram of an embodiment of the present invention, and FIG. 2 is a hydraulic circuit diagram of another embodiment of the present invention. 1 …… Table lifting cylinder 2 …… Hydraulic pump, 3 …… Oil tank 5,9 …… Check valve, 6 …… Relief valve 7,13,22 …… Solenoid valve 8 …… Throttle valve 10,11, 14,21,23 …… Couplings 12,15 …… Hose 20 …… Hydraulic pump mechanism for gantry operation

Claims (1)

[Scope of utility model registration request] 1. A cylinder is filled with oil sent from a hydraulic pump through a check valve to raise a table, and an oil passage for a 2-position 2-port switching valve is opened to let oil flow out from the table lifting cylinder. A table lifting hydraulic mechanism for lowering the table by means of an oil direction control means connected to an oil chamber of the cylinder and capable of supplying oil to at least the cylinder, and an oil circulation means connected to the direction control means, A table lifting hydraulic mechanism, comprising: connecting means that is attached to the end of the oil circulating means and is connectable to a gantry operating hydraulic pump mechanism.