JP7195951B2 - Mobile device with locking function - Google Patents

Description

The present invention relates to a mobile device with locking function.

Conventionally, there has been known a moving device for swinging, raising and lowering, or reciprocating an object. An example of such a moving device is a marine steering device that swings a rudder shaft connected to a rudder shaft. In such a marine steering system, there is one that operates a hydraulic cylinder with hydraulic pressure generated by an electric pump, and rotates the rudder shaft through a mechanism that converts linear motion of the hydraulic cylinder into rotary motion (for example, , see Patent Document 1).

JP 2004-161052 A

It is conceivable to use an electric actuator having a rod instead of the hydraulic cylinder. However, in this case, when maintaining a certain rudder angle against the fluid force on the rudder plate, in the configuration in which the rudder is swung by the electric actuator, it is necessary to continue to energize the electric actuator. Therefore, it is costly. Also, it is conceivable to provide a mechanism such as a clutch or a brake in order to avoid continuous energization of the electric actuator, but this complicates the structure. Further, when an object is held at a certain height by a lifting device, there is a problem similar to that of a marine steering device.

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a moving device with a lock function that can lock the position of a rod of an electric actuator with a simple configuration while suppressing costs.

A moving device with a lock function of the present invention includes at least one electric actuator having a rod, and hydraulic fluid flows out when the rod is moved in one axial direction, and when the rod is moved in the other axial direction. A first pressure chamber into which hydraulic fluid flows, and a second pressure chamber into which hydraulic fluid flows in when the rod moves in one axial direction and outflows when the rod moves in the other axial direction. a hydraulic flow path that connects the first pressure chamber and the second pressure chamber; a permission state that permits the flow of hydraulic fluid through the hydraulic flow path; and a prohibited state that the hydraulic fluid flows through the hydraulic flow path. and a switching valve that is switched between a prohibited state and a prohibited state.

According to the present invention, the position of the rod can be locked by prohibiting the flow of the hydraulic fluid in the hydraulic flow path connecting the first pressure chamber and the second pressure chamber by means of the switching valve. As a result, continuous energization of the electric actuator can be avoided, and costs can be reduced. Moreover, since the position of the rod can be locked without providing a mechanism such as a clutch or brake, the structure is not complicated. As described above, the position of the rod of the electric actuator can be locked with a simple configuration while suppressing costs.

In the above invention, the moving device with a lock function includes an accumulator and a relief valve, and may include a pressure holding device that holds the pressure of the hydraulic flow path between the set pressure of the accumulator and the set pressure of the relief valve. preferable.

According to the above configuration, the pressure in the hydraulic flow path is maintained between the set pressure of the accumulator and the set pressure of the relief valve (predetermined range) by the pressure holding device, so that the temperature of the hydraulic fluid in the hydraulic flow path changes. Ability to absorb volume changes. Specifically, when the hydraulic fluid expands due to the temperature rise and the pressure in the hydraulic pressure passage exceeds the set pressure of the relief valve, the hydraulic fluid is released to the accumulator via the relief valve, thereby reducing the pressure in the hydraulic pressure passage. Pressure can be lowered. On the other hand, when the hydraulic fluid shrinks due to a drop in temperature and the pressure in the hydraulic pressure passage becomes less than the set pressure of the accumulator, the hydraulic fluid is supplied from the accumulator to the hydraulic pressure passage to reduce the pressure in the hydraulic pressure passage. can be raised. In this manner, the pressure within the hydraulic flow path is maintained within a predetermined range.

In the above invention, it is preferable that the electric actuator is a linear motor.

According to the above configuration, the linear motor can be directly driven by electric power, and the efficiency of the energy for driving the actuator can be improved.

In the above invention, the electric actuator may swing a rudder shaft connected to the rudder shaft.

According to the above configuration, it is possible to lock the position of the rod of the electric actuator with a simple configuration while suppressing costs, thereby maintaining the steering angle.

In the above invention, the electric actuator may move an object up and down.

According to the above configuration, it is possible to lock the position of the rod of the electric actuator with a simple configuration while suppressing costs, thereby holding the object at a desired position.

According to the present invention, it is possible to provide a moving device with a locking function that can lock the position of the rod of the electric actuator with a simple configuration while suppressing costs.

1 is a diagram of a moving device with a lock function according to a first embodiment of the present invention; FIG. FIG. 5 is a diagram of a moving device with a locking function according to a second embodiment of the present invention; FIG. 11 is a diagram of a moving device with a locking function according to a third embodiment of the present invention; FIG. 10 is a diagram of a mobile device with a locking function according to a fourth embodiment of the present invention;

A moving device with a lock function according to an embodiment of the present invention will be described below with reference to the drawings. The mobile device with lock function described below is merely one embodiment of the present invention. Therefore, the present invention is not limited to the following embodiments, and additions, deletions, and modifications can be made without departing from the scope of the present invention.

(First embodiment)
FIG. 1 shows a mobile device 1 with a lock function according to a first embodiment of the present invention. As shown in FIG. 1, the moving device 1 with a lock function of this embodiment operates a first linear motor 5 and a second linear motor 6, which are electric actuators, to move the rudder shaft 4 via the rudder 2. It rotates. The rudder 2 is configured to be swingable and extends from the rudder shaft 4 to both sides. Grooves 2a and 2b are formed on both ends of the rudder 2 in a direction orthogonal to the axial direction of the first and second linear motors 5 and 6. As shown in FIG. A first pin 3a is inserted into the groove 2a, and a second pin 3b is inserted into the groove 2b.

The second linear motor 6 is arranged parallel to the first linear motor 5 . The first and second linear motors 5 and 6 have rods 7 configured to reciprocate in their axial directions. Each rod 7 is configured to reciprocate in its axial direction by electric power. The first pin 3a is provided at one end (the right end in FIG. 1) of the rod 7 of the first linear motor 5, and the second pin 3b is provided at one end of the rod 7 of the second linear motor 6. As shown in FIG.

In such a configuration, when the rod 7 of the first linear motor 5 moves in the direction of pushing the rudder 2 and the rod 7 of the second linear motor 6 moves in the direction of pulling the rudder 2, the rudder 2 It swings clockwise in FIG. Conversely, when the rod 7 of the first linear motor 5 moves in the direction of pulling the rudder 2 and the rod 7 of the second linear motor 6 moves in the direction of pushing the rudder 2, the rudder 2 moves as shown in FIG. swing counterclockwise. In this manner, the rudder shaft 4 can be rotated by swinging the rudder 2 .

A first cylinder 8 is connected to the base end portion of the first linear motor 5 . A base end portion of the rod 7 of the first linear motor 5 is arranged inside the first cylinder 8 . A first pressure chamber 8 a is formed in the first cylinder 8 in a region surrounded by the inner peripheral wall of the first cylinder 8 and the rod 7 . When the rod 7 moves in one axial direction (leftward in FIG. 1), hydraulic fluid flows out from the first pressure chamber 8a, and when the rod 7 moves in the other axial direction (rightward in FIG. 1), the hydraulic fluid flows out. Hydraulic fluid flows into the pressure chamber 8a. The hydraulic fluid used in the moving device 1 with a locking function is typically oil, but may be other liquid such as water.

Similarly, a second cylinder 9 is connected to the base end portion of the second linear motor 6 . A proximal end portion of the rod 7 of the second linear motor 6 is arranged inside the second cylinder 9 . A second pressure chamber 9 a is formed in a region surrounded by the inner peripheral wall of the second cylinder 9 and the rod 7 within the second cylinder 9 . When the rod 7 moves in one axial direction (leftward in FIG. 1), hydraulic fluid flows out from the second pressure chamber 9a, and when the rod 7 moves in the other axial direction (rightward in FIG. 1), the hydraulic fluid flows out. Hydraulic fluid flows into the pressure chamber 9a.

A hydraulic flow path 10 is provided in the moving device 1 with a locking function. The hydraulic flow path 10 connects the first pressure chamber 8a and the second pressure chamber 9a. A switching valve 11 is interposed in the hydraulic pressure flow path 10 to switch between a permission state that permits the flow of hydraulic fluid through the hydraulic pressure flow path 10 and a prohibition state that prohibits the flow of the hydraulic fluid through the hydraulic pressure flow path 10 . inserted. The operation of the switching valve 11 is controlled by a control device (not shown).

In such a configuration, when the first and second linear motors 5 and 6 are in operation, the switching valve 11 is opened and switched to the permission state. As a result, the hydraulic fluid flows into the first pressure chamber 8a and the hydraulic fluid flows out of the first pressure chamber 8a, and the hydraulic fluid flows out of the second pressure chamber 9a and operates the second pressure chamber 9a. Fluid inflow is permitted.

On the other hand, when the rudder plate is held at a certain rudder angle, that is, when the rotation of the rudder shaft 4 is stopped, the first and second linear motors 5 and 6 are stopped and the switching valve 11 is closed. is switched to the prohibited state. As a result, the flow of hydraulic fluid through the hydraulic flow path 10 is stopped, so that the movement of each rod 7 of the first and second linear motors 5, 6 is stopped. As a result, the swinging of the rudder 2 is stopped, and the rotation of the rudder shaft 4 can be stopped.

Next, the hydraulic flow path 10 is provided with a pressure holding device 12 that keeps the pressure of the hydraulic flow path 10 within a predetermined range. The pressure holding device 12 will be described below.

As shown in FIG. 1, the pressure holding device 12 includes a supply/discharge line 13, first to fourth connection lines 14, 15, 16 and 17, a relief valve 18, check valves 19 and 20, and a check valve 21. , 22 and an accumulator (pressure compensator) 23 .

An accumulator 23 is connected to one end of the supply/discharge line 13 . The accumulator 23 includes a cylinder 23a, a piston 23b and a spring member 23c. A working fluid chamber is formed in a region surrounded by the inner peripheral wall of the cylinder 23a and the piston 23b, and the piston 23b is pushed with a constant pressure by the spring member 23c. With such a configuration, the hydraulic fluid can be supplied to the supply/discharge line 13 from the hydraulic fluid chamber of the cylinder 23a, and the hydraulic fluid can escape to the hydraulic fluid chamber of the cylinder 23a.

One end of a first connection line 14 is connected to the other end of the supply/discharge line 13 . The other end of the first connection line 14 is connected to a portion of the hydraulic flow path 10 on one side of the switching valve 11 . One end of a second connection line 15 is connected to the other end of the supply/discharge line 13 . The other end of the second connection line 15 is connected to a portion of the hydraulic flow path 10 on the other side of the switching valve 11 . The check valve 19 is inserted in the first connection line 14 to prevent the hydraulic fluid from flowing in the direction from the check valve 19 to the first pressure chamber 8a, and prevent the hydraulic fluid from flowing in the direction from the check valve 19 to the relief valve 18. allow the flow of Further, the check valve 20 is inserted in the second connection line 15 to prevent the hydraulic fluid from flowing in the direction from the check valve 20 to the second pressure chamber 9a, and to prevent the hydraulic fluid from flowing in the direction from the check valve 20 to the relief valve 18. Allow hydraulic fluid flow.

One end of the third connection line 16 is connected to the first connection line 14 and the other end of the third connection line 16 is connected to the supply/discharge line 13 . One end of the fourth connection line 17 is connected to the second connection line 15 , and the other end of the fourth connection line 17 is connected to the supply/discharge line 13 .

The check valve 21 is inserted in the third connection line 16 to prevent the hydraulic fluid from flowing in the direction from the check valve 21 to the accumulator 23, and prevent the hydraulic fluid from flowing in the direction from the check valve 21 to the first pressure chamber 8a. Allow flow. Also, the check valve 22 is inserted in the fourth connection line 17 to prevent the hydraulic fluid from flowing in the direction from the check valve 22 to the accumulator 23, and to operate in the direction from the check valve 22 to the second pressure chamber 9a. Allow liquid flow. The check valves 21 and 22 suck the hydraulic fluid from the accumulator 23 when the pressure in the hydraulic flow path 10 becomes less than the set pressure of the accumulator 23 due to the contraction of the hydraulic fluid due to the temperature drop of the hydraulic fluid. and supply it to the hydraulic flow path 10 . On the other hand, the relief valve 18 is interposed in a portion of the supply/discharge line 13 further away from the accumulator 23 than the connection point of the third and fourth connection lines 16 and 17 . The relief valve 18 allows the pressure inside the hydraulic pressure passage 10 to increase when the pressure inside the hydraulic pressure passage 10 exceeds the set pressure (relief pressure) of the relief valve 18 due to the expansion of the hydraulic fluid due to the temperature rise of the hydraulic fluid. of hydraulic fluid to the accumulator 23. With the configuration described above, the pressure in the hydraulic flow path 10 can be maintained between the set pressure of the accumulator 23 and the set pressure of the relief valve 18 (predetermined range).

As described above, according to the moving device 1 with a locking function of the present embodiment, the switching valve 11 inhibits the flow of the hydraulic fluid in the hydraulic flow path 10 connecting the first pressure chamber 8a and the second pressure chamber 9a. The position of each rod 7 can be locked by setting the state. As a result, continuous energization of the linear motors 5 and 6 can be avoided, and costs can be suppressed. Moreover, since the position of the rod 7 can be locked without providing a mechanism such as a clutch or brake, the structure is not complicated. As a result, it is possible to lock the positions of the rods 7 of the linear motors 5 and 6 with a simple structure while suppressing costs, thereby maintaining the steering angle.

Further, in this embodiment, since the moving device 1 with a lock function is provided with the pressure holding device 12, the pressure in the hydraulic pressure passage 10 is held between the set pressure of the accumulator 23 and the set pressure of the relief valve 18 (predetermined range). can do.

Furthermore, in the present embodiment, by adopting the linear motors 5 and 6 as the electric actuators, it is possible to directly drive the linear motors 5 and 6 with electric power as compared with the case where the hydraulic actuators are driven by electric pumps. In this embodiment, it is possible to improve the energy efficiency for driving the linear motors 5, 6).

(Second embodiment)
Next, a mobile device 1A with a lock function according to a second embodiment will be described. In the mobile device 1A with a lock function shown in FIG. 2, the same components as those in the mobile device 1 with a lock function of the first embodiment described above are given the same reference numerals, and the description thereof will be omitted unless otherwise specified. .

As shown in FIG. 2, only one linear motor 5 is provided in the moving device 1A with a lock function of the second embodiment. In the mobile device with lock function 1A, the rudder 30 is configured to be swingable and extends from the rudder shaft 4 to one side. A groove 30 a is formed in the rudder handle 30 in a direction orthogonal to the axial direction of the linear motor 5 . A pin 3a is inserted into this groove 30a. The pin 3 a is provided in the middle of the rod 7 of the linear motor 5 .

A tip side portion of the rod 7 of the linear motor 5 is inserted into the cylinder 31 so as to be able to reciprocate. Thereby, a second pressure chamber 31 a is formed in a region surrounded by the inner peripheral wall of the cylinder 31 and the tip of the rod 7 . In such a configuration, when the rod 7 moves in one axial direction (to the left in FIG. 2), hydraulic fluid flows out from the first pressure chamber 8a and flows into the second pressure chamber 31a. Further, when the rod 7 moves in the other axial direction (to the right in FIG. 2), the hydraulic fluid flows into the first pressure chamber 8a and flows out from the second pressure chamber 31a.

A hydraulic flow path 10 is provided in the moving device 1A with a locking function. This hydraulic flow path 10 connects the first pressure chamber 8a and the second pressure chamber 31a. A switching valve 11 similar to that of the above-described first embodiment is provided in the hydraulic flow path 10 .

In such a configuration, when the linear motor 5 is in operation, the switching valve 11 is opened and switched to the permission state described above. As a result, the hydraulic fluid flows into the first pressure chamber 8a and the hydraulic fluid flows out of the first pressure chamber 8a, and the hydraulic fluid flows out of the second pressure chamber 31a and acts on the second pressure chamber 31a. Fluid inflow is permitted.

On the other hand, when the rudder plate is held at a certain rudder angle, that is, when the rotation of the rudder shaft 4 is to be stopped, the operation of the linear motor 5 is stopped and the switching valve 11 is closed to enter the prohibition state described above. can be switched. As a result, the flow of hydraulic fluid through the hydraulic flow path 10 is stopped, so that the movement of the rod 7 of the linear motor 5 is stopped. As a result, the swinging of the rudder 30 is stopped, and the rotation of the rudder shaft 4 can be stopped. The configuration and function of the pressure holding device 12 are the same as those of the first embodiment.

As described above, according to the moving device 1A with a locking function of the present embodiment, the switching valve 11 prohibits the flow of the hydraulic fluid in the hydraulic flow path 10 connecting the first pressure chamber 8a and the second pressure chamber 31a. , the position of the rod 7 of the linear motor 5 can be locked. As a result, continuous energization of the linear motor 5 can be avoided, and costs can be suppressed. Moreover, since the position of the rod 7 can be locked without providing a mechanism such as a clutch or brake, the structure is not complicated. As a result, it is possible to lock the position of the rod 7 of the linear motor 5 with a simple structure while suppressing costs, thereby maintaining the steering angle.

(Third Embodiment)
Next, a mobile device 1B with a lock function according to the third embodiment will be described. In the moving device 1B with a locking function of FIG. 3, the same reference numerals are given to the same components as in the moving device 1 with a locking function of the first embodiment and the moving device 1A with a locking function of the second embodiment. , the description is omitted unless otherwise specified.

As shown in FIG. 3, only one linear motor 5 is provided in the moving device 1B with a lock function of the third embodiment. In the moving device 1B with locking function, the pin 3a is provided at the tip of the rod 7 of the linear motor 5 (the right end in FIG. 3). A proximal end portion of the rod 7 is inserted into the cylinder 32 so as to be able to reciprocate. A partition wall portion 7a is provided at the proximal end portion of the rod 7, and the area inside the cylinder 32 is partitioned into a first pressure chamber 32a and a second pressure chamber 32b by the partition wall portion 7a. In such a configuration, when the rod 7 moves in one axial direction (to the left in FIG. 3), hydraulic fluid flows out from the first pressure chamber 32a and flows into the second pressure chamber 32b. Further, when the rod 7 moves in the other axial direction (to the right in FIG. 3), the working fluid flows into the first pressure chamber 32a and flows out from the second pressure chamber 32b.

A hydraulic flow path 10 is provided in the moving device 1B with a locking function. This hydraulic flow path 10 connects the first pressure chamber 32a and the second pressure chamber 32b. A switching valve 11 similar to that of the first and second embodiments is provided in the hydraulic flow path 10 .

In such a configuration, when the linear motor 5 is in operation, the switching valve 11 is opened and switched to the permission state described above. As a result, the hydraulic fluid flows into the first pressure chamber 32a and the hydraulic fluid flows out from the first pressure chamber 32a. Fluid inflow is permitted.

On the other hand, when the rudder plate is held at a certain rudder angle, that is, when the rotation of the rudder shaft 4 is to be stopped, the operation of the linear motor 5 is stopped and the switching valve 11 is closed to enter the prohibition state described above. can be switched. As a result, the flow of hydraulic fluid through the hydraulic flow path 10 is stopped, so that the movement of the rod 7 of the linear motor 5 is stopped. As a result, the swinging of the rudder 30 is stopped, and the rotation of the rudder shaft 4 can be stopped. The structure and function of the pressure holding device 12 are the same as those of the first and second embodiments.

As described above, according to the moving device 1B with a lock function of the present embodiment, the switching valve 11 prohibits the flow of the hydraulic fluid in the hydraulic flow path 10 connecting the first pressure chamber 32a and the second pressure chamber 32b. , the position of the rod 7 of the linear motor 5 can be locked. As a result, continuous energization of the linear motor 5 can be avoided, and costs can be suppressed. Moreover, since the position of the rod 7 can be locked without providing a mechanism such as a clutch or brake, the structure is not complicated. As a result, it is possible to lock the position of the rod 7 of the linear motor 5 with a simple structure while suppressing costs, thereby maintaining the steering angle.

(Fourth embodiment)
Next, a mobile device 1C with a lock function according to a fourth embodiment will be described. In the moving device 1C with a locking function shown in FIG. 4, the same components as those in the moving devices 1, 1A, and 1B with a locking function of the above-described first to third embodiments are denoted by the same reference numerals, and special mention is made. The description will be omitted except for this.

As shown in FIG. 4, a moving device 1C with a locking function according to the present embodiment raises and lowers an object W by operating a linear motor 5, which is an electric actuator. Only one linear motor 5 is provided in the moving device 1C with a locking function.

At the upper end of the rod 7 of the linear motor 5, for example, a plate-like holding portion 40 for holding the object W is provided. A connecting member 41 extending in one horizontal direction (to the right in FIG. 4) is provided at the upper end portion of the rod 7, and the one horizontal direction (rightward in FIG. 4) is provided at the lower end portion of the rod 7. A connection member 42 extending to the right in FIG. 4 is provided.

A cylinder 33 is provided in parallel with such a linear motor 5 . Inside the cylinder 33, there is provided a rod 35 having both ends protruding outside the cylinder 33, and a region provided in the middle of the rod 35 to divide the area inside the cylinder 33 into a first pressure chamber 33a and a second pressure chamber 33b. A partition wall portion 34 is arranged. The upper end of the rod 35 is connected to the connecting member 41 described above, and the lower end of the rod 35 is connected to the connecting member 42 described above.

In such a configuration, when the rod 7 moves upward, the hydraulic fluid flows into the first pressure chamber 33a and flows out of the second pressure chamber 33b. Further, when the rod 7 moves downward, the hydraulic fluid flows out from the first pressure chamber 33a and flows into the second pressure chamber 33b.

A hydraulic flow path 10 is provided in the moving device 1C with a locking function. This hydraulic flow path 10 connects the first pressure chamber 33a and the second pressure chamber 33b. A switching valve 11 similar to that of the above-described first to third embodiments is provided in the hydraulic flow path 10 .

In such a configuration, when the linear motor 5 is in operation, the switching valve 11 is opened and switched to the permission state described above. As a result, the hydraulic fluid flows into the first pressure chamber 33a and the hydraulic fluid flows out from the first pressure chamber 33a. Fluid inflow is permitted.

On the other hand, when the holding height of the object W is to be locked (maintained), the operation of the linear motor 5 is stopped and the switching valve 11 is closed to switch to the prohibition state described above. As a result, the flow of the hydraulic fluid through the hydraulic flow path 10 is stopped, and the vertical movement of the rod 7 of the linear motor 5 is stopped. Thereby, the holding height of the object W can be maintained. The configuration and function of the pressure holding device 12 are the same as those of the first to third embodiments.

As described above, according to the moving device 1C with a lock function of the present embodiment, the switching valve 11 prohibits the flow of the hydraulic fluid in the hydraulic flow path 10 connecting the first pressure chamber 33a and the second pressure chamber 33b. , the position of the rod 7 of the linear motor 5 can be locked. As a result, continuous energization of the linear motor 5 can be avoided, and costs can be suppressed. Moreover, since the position of the rod 7 can be locked without providing a mechanism such as a clutch or brake, the structure is not complicated. As a result, it is possible to lock the position of the rod 7 of the linear motor 5 with a simple structure while suppressing costs, thereby maintaining the height at which the object W is held.

(Other embodiments)
In addition to the above embodiments, the present invention can be modified in various ways without departing from the scope of the invention.

In the above first to third embodiments, the linear motion of the linear motor is converted into the rocking motion of the rudder by providing the rod with the pin inserted into the groove of the rudder. Not limited to this, other conversion mechanisms such as a rack and pinion gear system, for example, may be employed.

Also, in each of the above embodiments, a linear motor is used as an electric actuator, but the present invention is not limited to this, and other electric actuators such as an electromagnetic plunger may be used.

Reference Signs List 1, 1A, 1B, 1C Moving device with lock function 2 Rudder handle 4 Rudder shaft 5, 6 Linear motor (electric actuator)
7 Rod 8a, 32a, 33a First Pressure Chamber 9a, 31a, 32b, 33b Second Pressure Chamber 10 Hydraulic Pressure Channel 11 Switching Valve 12 Pressure Holding Device 18 Relief Valve 23 Accumulator W Object

Claims (4)

at least one electric actuator having a rod;
a first pressure chamber into which hydraulic fluid flows out when the rod moves in one axial direction and into which hydraulic fluid flows in when the rod moves in the other axial direction;
a second pressure chamber into which hydraulic fluid flows when the rod moves in one axial direction, and into which hydraulic fluid flows out when the rod moves in the other axial direction;
a hydraulic flow path connecting the first pressure chamber and the second pressure chamber;
a switching valve that is switched between a permission state that permits the flow of hydraulic fluid through the hydraulic flow path and a prohibition state that prohibits the flow of hydraulic fluid through the hydraulic flow path ;
a pressure holding device that includes an accumulator and a relief valve and holds the pressure of the hydraulic flow path between a set pressure of the accumulator and a set pressure of the relief valve ;
A moving device with a lock function , wherein the flow of the hydraulic fluid is set to the prohibited state by the switching valve to lock the position of the rod . 2. The moving device with locking function according to claim 1 , wherein said electric actuator is a linear motor. 3. The mobile device with a locking function according to claim 1, wherein said electric actuator swings a rudder shaft connected to a rudder shaft. 3. The moving device with a locking function according to claim 1, wherein said electric actuator lifts and lowers an object.

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