JPS5810557Y2 - Datsusuiki - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a dehydrator which is designed to improve safety against rotation of a dehydration tank in order to increase safety in use.

In recent years, dehydrators have been equipped with locking devices powered by electromagnets, for example, in order to prevent the danger of opening the lid while the dehydrating tank is rotating. It is considered that the opening/closing lid is continuously locked in the closed position not only during operation but also during inertia rotation after the motor is turned off. The electromagnet device is kept energized by a controlling timer device, and during inertia rotation after the motor is powered off, the electromagnet device is controlled by an inertia rotation detection device operated by the frictional force generated between the brake drum and the brake lever of the brake device. The configuration is such that it continues to remain energized.

However, with this configuration, it takes some time (usually about 0.5 seconds) for the brake lever to come into sliding contact with the brake drum and for the inertia rotation detection device to operate after the motor is turned off by the timer device. ), the electromagnetic device becomes de-energized for a short period of time, causing the inconvenience that the opening/closing lid is unlocked.

In addition, for example, if the brake shoe of the brake lever becomes too worn and the frictional force decreases, the inertial rotation detection device will no longer operate, and the opening/closing lid will be unlocked even though the dehydration tank is rotating due to inertia. It reminds me of inconvenience.

The present invention was developed in view of the above circumstances, and its purpose is to rotate the dewatering tank by a motor by effectively utilizing the movement of the brake lever toward and away from the brake lever and the frictional force generated between the brake lever and the brake drum. The opening/closing lid can be continuously locked in the closed position not only during driving, but also during inertia rotation after the motor power is cut off, and there is no risk of the unlocked state appearing even for a short period of time. Even if frictional force is not generated between the brake lever and the brake drum due to a malfunction, or even if it is generated, it is not sufficient, the opening/closing cover can be kept locked, which greatly improves safety overall, and also allows for normal operation. To provide a dehydrator that can be reliably unlocked at the time of failure and locked at the time of failure, and which is easy to assemble.

An embodiment of the present invention will be described below based on the drawings.

First, in FIG. 1, reference numeral 1 denotes an outer box with an operation box 2 erected at the rear of the upper part, and a water receiving tank 3 is arranged inside the outer box.

4 is a dewatering tank rotatably arranged in the water receiving tank 3; 5 is a dehydrating shaft directly connected to the outer bottom of the dehydrating tank 4; the lower end of the dehydrating shaft 5 is connected to the inner bottom of the outer box 1; It is connected via a connector 7 to a rotating shaft 6a of an elastically supported motor 6.

Reference numeral 8 denotes a cover attached to the upper end of the water receiving tank 3, and an opening 9 for entering and exiting the dehydrated material facing into the dehydrating tank 4 is formed approximately in the center of the cover.

Reference numeral 10 designates an inner lid as an opening/closing lid that directly opens and closes the opening 9, and shaft portions 10a protrude from both left and right sides of the rear end. Bearing portions 8a ( Both are pivoted so that they can be rotated to open and close (only one is shown).

Reference numeral 11 denotes a locking device for locking the inner lid 10 in the closed position (the position shown by the solid line in FIG. 1), and the locking device 11 will be described here.

That is, reference numeral 12 denotes an engagement piece protruding downward from the front back side of the inner lid 10, and an engagement hole 12a is formed at its lower end.

A through hole 13 is formed in the flange portion 3a extending around the outer periphery of the upper end of the water receiving tank 3 to allow the engaging piece 12 to protrude into the outer box 1.

14 is a support fixed to the inside of the front surface of the outer box 1; 15;
is an abbreviated retaining lever rotatably supported on the upper part of the support 14 via a shaft pin 16;
An engagement hole 12 of the locking piece 12 is provided on the upper side of the vertical part of the locking piece 12.
An engagement pressure 15a is provided in a protruding manner to releasably engage the engagement pressure 15a.

17 is a tension spring stretched between the vertical part of the engagement lever 15 and the front part of the outer box 1;
5 is always urged to rotate in the direction of arrow A.

Therefore, the engagement lever 15 is normally held in a released state separated from the engagement piece 12 of the inner cover 10 (see solid line in Figure 1), and is moved in the opposite direction of arrow A against the spring force of the tension spring 17. When rotated, the locking pawl 15a is engaged with the engagement hole 12a of the engagement piece 12 to lock the inner lid 10 in the closed position (see the dashed line in FIG. 1).

Reference numeral 18 denotes an outer cover that indirectly opens and closes the opening 9 from above the inner cover 10, and this has an approximately F-shaped hinge portion 18a extending toward the rear, and the tip of the hinge portion 18a is set as a fulcrum within the operation box 2. axis 1
9 and is pivotably supported.

20 is a lid switch that opens and closes in conjunction with the rotation of the outer lid 18 in the opening and closing directions; 21 is a clockwork-type timer device, for example, operated by a knob 22; although not shown, these timer devices 21, the lid switch 20, and the motor 6 are connected in series to a power source.

Now, in FIGS. 2 and 3, reference numeral 23 denotes a brake device for braking the inertial rotation of the dewatering tank 4. This brake device 23 will be described below.

That is, 24 is a brake drum, which is connected to the connector 7.
It is fixed to the lower part of the dehydration tank 4 by welding or the like, and rotates integrally with the dehydration tank 4.

Reference numeral 25 denotes a holding ring disposed on the upper surface of the motor 6 concentrically with the rotating shaft 6a, on which a movable plate 26 as a movable member is rotatably supported. One arm 27 of the integrally extending arms 27 and 28
A tension spring 30, which corresponds to a first spring, is stretched between the holder 29 and the holder 29 erected on the upper surface of the motor 6 to constantly urge the movable plate 26 to rotate in the direction of arrow B.

Reference numerals 31a and 31b are stopper pieces installed on the upper surface of the motor 6 so as to be located on both sides of the arm 28 of the movable plate 26, and these stopper pieces prevent the rotation of the movable plate 26 in the direction of arrow B and the direction opposite to arrow B. The movable plate 26 normally stops its rotation in the direction of arrow B due to the tension spring 30 by the stopper piece 31a, and reaches the rotation limit position in the direction of arrow B as shown in FIG. (return position).

Reference numeral 32 designates a brake lever having a brake shoe 33 fixed to the approximately central portion with a set screw, one end of which is rotatably supported at the tip of the arm 27 of the movable plate 26 via a stepped screw 34. .

Further, a tension spring 35 corresponding to a second spring is stretched between the other end of the brake lever 32 and the tip of the arm 28 of the movable plate 26.
2 is always rotated in the direction of arrow C.

As a result, the brake lever 32 normally presses the brake shoe 33 against the brake drum 24 to restrain the free rotation of the dehydration tank 4.

Reference numeral 36 denotes a swing lever rotatably pivoted to the tip of the arm 28 of the movable plate 26 via a stepped screw 37, and a roller 38 at one end that contacts the other end of the brake lever 32. is installed so that it can rotate freely.

39 is a flexible tube into which a control wire 40 is inserted, one end of which is fixed to a fixture 41 disposed on the upper surface of the motor 6, and the other end fixed to the outside of the back of the water tank 3. do.

One end of the control wire 40 is connected to the other end of the swing lever 36, and the other end is connected to the connecting rod 42.
It is connected to a hooking part 18b formed at the bent part of the hinge part 18a of the outer cover 18 through the above-mentioned.

Since the engaging portion 18b is displaced downward and upward as the outer cover 18 rotates in the opening and closing directions, the outer cover 18
from the open position (the position indicated by the solid line in Figure 1) to the closed position (
When rotated toward the position indicated by the two-dot chain line in Figure 1,
The control wire 40 is pulled in the direction of the arrow via the connecting rod 42.

By the way, the spring force of the tension spring 35 is set to be stronger than that of the tension spring 30, so that when the control wire 40 is pulled in the direction of the arrow, the tension is applied to the swing lever 36 and the stepped screw. 37 to the arm 28 of the movable plate 26, the movable plate 26 first rotates in the counter-arrow B direction against the spring force of the tension spring 30.

When the movable plate 26 is stopped from rotating in the direction opposite to the arrow B by the stopper piece 31b and reaches the rotation limit position (predetermined position) in the direction opposite to the arrow B shown in FIG. By rotating in the direction of arrow E around the stepped screw 37,
Next, the brake lever 32 rotates in the counter-arrow C direction against the spring force of the tension spring 35 from the position shown by the two-dot chain line in FIG. 4 toward the position shown by the solid line, and the brake lever 32
is separated from the brake drum 24.

Conversely, when the outer cover 18 is rotated from the closed position to the open position, the control wire 40 is relaxed, and the brake lever 32 is first moved by the spring force of the tension spring 35 to move the swing lever 36 in the direction opposite to arrow E. The brake shoe 33 is brought into pressure contact with the brake drum 24 by rotating in the direction of arrow C from the position shown by the solid line in FIG. 4 to the position shown by the two-dot chain line in FIG. 26 is rotated in the direction of arrow B by the spring force of the tension spring 30.

Therefore, the movable plate 26 responds to the rotation of the brake lever 32 in the direction of arrow C and in the direction opposite to arrow C (contact/separation movement).
It reciprocates in the direction of arrow B and in the opposite direction of arrow B.

As will be clear from the description below, even if the brake lever 32 rotates in the direction of arrow C during inertial rotation braking of the dehydration tank 4, the movable plate 26 will not move unless an abnormal situation such as a failure occurs.
is held at the predetermined position until the dehydration tank 4 is stopped.

Reference numeral 43 designates an actuation plate as an actuation member, which is formed by bending an upright piece 43a having a substantially inverted letter shape at one end, and 44 is a rotating lever.
It is pivotally supported by a stepped screw 46 to a support plate 45 fixed to the upper surface of the holder so as to be rotatable in a reciprocating manner.

A projection 44a is provided at one end of the rotation lever 44.
is provided to protrude upward, and the protrusion 44a is connected to the movable plate 26.
is engaged with the elongated hole 47 formed at the tip of the arm 27,
Thus, the rotary lever 44 is configured to reciprocate in conjunction with the reciprocating rotation of the movable plate 26.

Incidentally, a first through hole 48 and a second through hole 49 are formed at the other end of the actuating plate 43 at a predetermined distance from each other, while the rotating lever 44 is formed at the other end. It has a holding hole 44b that opens upward, and a sphere 51 that is constantly urged upward by a compression spring 50 is placed in the holding hole 44b.
Insert and hold.

The sphere 51 is normally removably engaged with the first through hole 48, so that the actuating plate 43 is normally in the positional relationship shown in FIG. 2 with respect to the rotary lever 44. While being held, it reciprocates integrally with the rotating lever 44.

Therefore, the rotary lever 44, the sphere 51, etc. are connected to the movable plate 2.
It is used as a linking device to transmit the reciprocating displacement of 6 to the actuating plate 43.

Reference numeral 52 designates an abutting arm as an abutting element whose one end is movably, ie, rotatably, pivoted to the upper surface of the brake drum 24 via a stepped screw 53, and this is indicated by the two-dot chain line X in FIG. It is possible to rotate between the same positions indicated by and Y.

Reference numeral 54 denotes a torsion coil spring as a third spring wound around the stepped screw 53. Both ends of the spring are fixedly connected to the brake drum 24 and the contact arm 52, and the contact arm 52 is normally connected to the brake drum 24 and the contact arm 52. It is held in the midway between the X position and the Y position, that is, in the road locking position (the position shown by the solid line in FIG. 2).

Reference numeral 55 denotes a stopper piece installed upright on the brake drum 24, which is used when the abutment arm 52 rotates in the direction of arrow F.
When the position is reached, it abuts this and further arrow F
This prevents rotation in the direction.

Note that both side portions of the stepped screw 53 of the contact arm 52 are substantially balanced, and even if the brake drum 24 rotates at high speed, it will not rotate in the direction of arrow F or in the opposite direction of arrow F due to centrifugal force. do not have.

When the movable plate 26 is at the return position, the rotary lever 44 is at the rotation limit position in the direction of arrow G, and accordingly, the actuating plate 43 is also at the rotation limit position (inactive) in the direction of arrow G. The distal end of the upright piece 43a is positioned within the rotation locus of the engagement arm 52 at the engagement position.

When the movable plate 26 rotates in the direction opposite to arrow B, the rotary lever 44 rotates in the direction opposite to arrow G in conjunction with this, so that the actuating plate 43 also rotates integrally with the rotary lever 44 in the direction opposite to arrow G. direction, the tip of the upright piece 43a touches the abutting arm 5.
It is caused to escape outward from the rotation locus at the second engagement position.

56 is a flexible tube into which a control wire 57 is inserted, one end of which is fixed to the holder 29;
The other end is fixed to the lower part of the support 14.

One end of the control wire 57 is connected to the actuating plate 43, and the other end is connected to the horizontal portion of the engagement lever 15.

Next, the operation of this embodiment configured as described above will be explained.

The inner lid 10 is opened and the object to be dehydrated (not shown) is put into the dehydration tank 4 through the opening 9, and then the inner lid 10 is first closed, and then the outer lid 18 is closed.

Then, as the outer lid 18 rotates in the closing direction, the control wire 40 is pulled in the direction indicated by the arrow B, so first the movable plate 26 rotates in the opposite direction of the arrow B against the spring force of the tension spring 30. do.

In conjunction with the rotation of the movable plate 26 in the counter-arrow B direction, the pivot lever 44 rotates together with the actuation plate 43 in the counter-arrow G direction, so that the upright piece 43 a of the actuation plate 43 touches the abutting arm. 52
At the same time, the control wire 57 is pulled in the direction of arrow H (see FIG. 4).

As a result, the engagement lever 15 rotates in the opposite direction of arrow A against the spring force of the tension spring 17, and the engagement claw 15 rotates in the opposite direction of arrow A.
a is engaged with the engagement hole 12a of the engagement piece 12, thereby locking the inner lid 10 in the closed position (see the dashed line in FIG. 1).

When the movable plate 26 reaches the predetermined position shown by the solid line in FIG. 4, the swing lever 36 rotates in the direction of arrow E.
Next, the brake lever 32 rotates in the opposite direction of arrow C against the springing force of the tension spring 35 to separate the brake shoe 33 from the brake drum 24.

On the other hand, when the outer lid 18 reaches the closed position, the lid switch 20
is closed, and then, when the timer device 21 is set, the motor 6 is activated and begins to rotate the dehydration tank 4, thereby performing a so-called dehydration operation.

When the time set by the timer device 21 has elapsed, the motor 6 is cut off, and the dehydration tank 4 continues to rotate due to inertia.

When the outer cover 18 is opened while the dehydration tank 4 is inertial rotation, the control wire 40 is loosened.
The brake lever 32 rotates in the direction of arrow C due to the spring force of the tension spring 35, presses the brake shoe 33 against the brake drum 24, and starts braking the inertial rotation of the dewatering tank 4 (see the dashed line in FIG. 4). .

By the way, when the brake shoe 33 comes into pressure contact with the brake drum 24 as described above, a frictional force acts between the two in the direction of rotation of the brake drum 24 (in the direction of the arrow).

This frictional force acts on the movable plate 26 via the brake lever 32 and the stepped screw 34 to rotate it in the opposite direction of arrow B. It is held in a predetermined position against a force, and even if the control wire 40 is relaxed and the brake lever 32 is rotated in the direction of arrow C as described above, it will not rotate in the direction of arrow B.

Therefore, the lock device 11 is maintained in the locked state not only while the motor 6 is rotating the dehydration tank 4 but also during the inertia rotation of the dehydration tank 4 after the motor 6 is powered off, thereby locking the inner lid 10 in the closed position. continue.

When the dewatering tank 4 stops, the frictional force between the brake drum 24 and the brake shoe 33 also disappears, so the movable plate 26 is rotated in the direction of arrow B by the spring force of the bow 1 tension spring 30 and returns to the return position. return.

In conjunction with the rotation of the movable plate 26 in the direction of arrow B, the rotation lever 44 rotates together with the actuation plate 43 in the direction of arrow G and returns to its original position. The control wire 57 is relaxed while being located within the rotation locus of the engagement arm 50 in the engagement position.

As a result, the engagement lever 15 is rotated in the direction of arrow A by the spring force of the tension spring 17, and the engagement claw 15 a
is removed from the engagement hole 12a of the engagement piece 12, and the inner lid 1 is removed.
Unlock 0.

In this state, the inner cover 10 can be opened by lifting the front part of the inner cover 10.

Now, if the amount of wear of the brake shoes 33 reaches a predetermined amount or more due to long-term use, even if the brake shoes 33 slide into contact with the brake drum 24 during the inertial rotation of the dehydration tank 4, no effective frictional force will be generated. It becomes impossible to hold the movable plate 26 in the predetermined position shown in FIG. 4 against the spring force of the tension spring 30.

Therefore, when the brake lever 32 rotates in the direction of arrow C with the opening of the outer cover 18, the movable plate 26 immediately moves the tension spring 3
Due to the spring force, it rotates in the direction of arrow B and returns to the return position shown in FIG.

However, in this case, since the rotary lever 44 rotates in the direction of arrow G together with the actuation plate 43 in conjunction with the rotation of the movable plate 26 in the direction of arrow B, the upright piece 43 a of the actuation plate 43 comes into contact. It is located within the rotation locus of the arm 52 in its engagement position.

Since the abutting arm 52 rotates integrally with the brake drum 24 in the direction of the arrow (■) during the inertia rotation of the dewatering tank 4, when the actuating plate 43 is rotationally displaced in the direction of the arrow G as described above, , the abutting arm 52 immediately hits the upright piece 43a of the actuating plate 43 (see dashed line X in Figure 5).

Then, the actuating plate 43 instantly rotates in the direction of arrow F, resisting the elastic force of the torsion coil spring 54, to increase the degree of contact (overlapping degree) with the upright piece 43a, and reaches the Y position. (See the broken line Y in FIG. 5.) Thereafter, the entire actuating plate 43 is urged to rotate in the direction opposite to the arrow G via the upright piece 43a.

As a result, the actuating plate 43 causes the sphere 51 to escape from the first through hole 48 and rotates in the opposite direction of arrow G from the inoperative position shown by the two-dot chain line in FIG. 5 toward the actuating position shown by the solid line. Here, the sphere 51 encounters and engages with the second through hole 49, holding the actuating plate 43 in the actuating position, and at the same time, the abutment arm 52 separates from the upright piece 43a and releases the torsion coil spring. Immediately rotates in the opposite direction of arrow F due to the elastic force of 54,
It returns to the engaged position (see solid line in Figure 5).

As described above, the control wire 57 is pulled in the direction of arrow H due to the rotational displacement of the actuation plate 43 in the opposite direction of arrow G, that is, the displacement to the actuation position, so that the rotation of the movable plate 26 in the direction of arrow B is caused. However, the locking device 11 is still attached to the inner lid 10.
remains locked in the closed position.

Also, if the brake shoe 33 is damaged and falls off, or if the tension spring 35 or stepped screw 34 is broken, the movable plate 26 will rotate in the direction of arrow B due to the spring force of the tension spring 30. Therefore, as described above, the actuating plate 43 is abutted against the abutment arm 52 and is displaced to the actuating position, so that the locking device 11 continues to lock the inner lid 10 in the closed position.

According to this embodiment, the movable plate 26 is displaced from the return position to the predetermined position before the brake lever 32 is rotated in the direction opposite to the arrow C at the start of the dewatering operation, and the brake lever 32 is moved in the direction of the arrow C. If the dehydration tank 4 is rotating due to inertia, the brake drum 24 and brake shoes 33
Since the locking device 11 is held in a predetermined position by the frictional force generated between the motor 6 and the dewatering tank 4, the locking device 11 continues to operate not only while the motor 6 is rotating the dehydrating tank 4, but also while the motor 6 is inertly rotating the dehydrating tank 4 after the power is cut off. The inner lid 10 is then locked in the closed position.

Moreover, even if the brake lever 32 rotates in the direction of the arrow C, the movable plate 26 does not rotate in the direction of the arrow B and is held at the predetermined position as described above. The inner lid 10 will not be unlocked even if it takes a long time, and safety will be greatly improved.

In addition, if frictional force is not generated between the brake drum 24 and the brake shoes 33 due to a failure or the like, or even if it is generated, it is not sufficient, the movable plate 26 may move in the direction of the arrow even though the dehydration tank 4 is inertial rotation. Even if the actuating plate 43 rotates in the direction B, the actuating plate 43
3a is struck by the contact arm 52 and displaced to the operating position, and the locking device 11 is maintained in the locked state, so even if a failure occurs in the brake device 23, the inner cover 10 can continue to be locked in the closed position. This makes it possible to further improve safety.

Further, when the brake device 23 fails, when the contact arm 52 contacts the rising piece 43a of the actuating plate 43 in the inoperative position, the corresponding contact arm 52 immediately rotates to the Y position and rises. Since the degree of contact with the piece 43a is increased,
Accordingly, the amount of rotational displacement of the actuating plate 43 in the direction opposite to the arrow G can be set to be large, and the retaining lever 15 can be reliably engaged with the retaining piece 12.

When the actuating plate 43 reaches the actuating position, the abutting arm 52 separates from the upright piece 43 a and returns to the engagement position.
3a and while maintaining the gap R (see FIG. 5), it does not come into contact with the tip of the rising piece 43a every time it rotates.

Therefore, even if there are slight variations in the mounting position or engagement position of the abutting arm 52, there is no functional problem, and the assembly work can be simplified.

By the way, when the brake device 23 is functioning normally (normal condition), the actuation plate 43 moves from the actuation position to the arrow G.
When rotating in the direction and returning to the non-operating position, the contact arm 52 may come into contact with the upright piece 43 a of the actuating plate 43 depending on the stopping position of the brake drum 24 .

In this case, if the contact arm 52 is fixedly attached to the brake drum 24, the complete return of the actuating plate 43 will be inhibited, and the engagement lever 15 will not be able to rotate sufficiently in the direction of arrow A. This causes the inconvenience that the lock of the inner lid 10 cannot be released.

However, according to this embodiment, the contact arm 52 is moved between the X position and the Y position.
Since the abutment arm 52 is rotatable between the X and Y positions and is always located approximately at the center (engagement position) between the When abutted, as it rotates in the direction of arrow G, it resists the elastic force of the torsion coil spring 54 and rotates in the direction of arrow F or in the opposite direction depending on the contact position within the rotation range between the X and Y positions. It rotates in the F direction, allowing the actuating plate 43 to return completely (see FIGS. 6 and 7).

Therefore, the inconvenience that the locking of the inner lid 10 becomes insufficient can be effectively prevented.

However, only when the abutting arm 52 is rotated in the direction of arrow F by the centrifugal force accompanying the rotation of the brake drum 24 and the rotation limit position is reached, the rising piece 43a moves within the rotation locus of the abutting arm 52. If the actuating plate 43 is located at
Although it is possible to completely restore the
Variation in the rotational speed of the brake drum 24 or stepped screw 53
Due to the frictional force between
However, in this embodiment, the abutment arm 52 is always held at the engagement position, so such a problem does not occur.

Note that the present invention is not limited to the embodiments described above and shown in the drawings, and can be implemented with various modifications without departing from the gist thereof.

As explained above, the present invention can significantly improve safety, and can reliably release the lock in normal conditions, as well as ensure lock operation in the event of a failure.
Furthermore, it is possible to provide a dehydrator that is easy to assemble.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, with FIG. 1 being a longitudinal side view showing the overall outline, and FIG. 2 being an enlarged plan view of the brake device.
Figure 3 is a vertical sectional side view taken along line ■I■-III in Figure 2;
FIG. 4 to FIG. 7 are action explanatory views. In the drawings, 1 is an outer box, 4 is a dehydration tank, 6 is a motor, 9 is an opening, 10 is an inner lid (opening/closing lid), 11 is a locking device, 12 is an engaging piece, 15 is an engaging lever, and 17 is tension spring, 1
8 is an outer lid, 23 is a brake device, 24 is a brake drum, 26 is a movable plate (movable member), 30 is a tension spring (
32 is a brake lever, 33 is a brake shoe, 35 is a tension spring (second spring), 40 is a control wire, 43 is an actuation plate (actuation member), 44 is a rotation lever, 50 is a compression spring, 51
52 is a spherical body, 52 is an abutting arm (abutting element), 54 is a torsion coil spring (third spring), and 57 is a control wire.

Claims (1)

[Scope of utility model registration request] A dehydration tank, an opening/closing lid pivotably mounted on the opening of an outer box in which the dehydration tank is installed, a brake drum that rotates integrally with the dehydration tank, and a return position and a predetermined position near the brake drum. a movable member that is reciprocally displaceable between the two positions and is always biased toward the return position by a first spring; A brake that is always biased by a second spring in the direction of sliding contact with the brake drum and holds the movable member in the predetermined position due to the frictional force generated between the brake drum and the brake drum when the dehydration tank is braked by inert rotation. a lever, which is rotatably pivoted on the movable member so that one end is in contact with the brake lever, and when the other end is pulled at the start of dehydration operation, the magnitude of the spring force of the first and second springs; a swinging lever that rotates after displacing the movable member from the return position to a predetermined position to displace the brake lever in a direction away from the brake drum; is a direction in which the abutting element is held at an intermediate locking position within the movable range by a third spring, and the abutting element moves out of the rotation trajectory in response to the displacement of the movable member to a predetermined position. In response to the displacement of the movable member to the return position, the brake drum is displaced to its original position within the rotation locus of the abutment element, and only when the brake drum is rotating, it hits the abutment element and rotates. an actuating member that is displaced in a direction away from the rotational trajectory and held at that displacement position; and an actuating member that operates in conjunction with the displacement of the actuating member in the direction that the abutting element leaves the rotational trajectory and opens the opening/closing lid. a locking device that locks in the closed position, and when the abutting element collides with the actuating member, the abutting element is displaced from the engaging position in a direction that increases the degree of contact with the actuating member, and when separated from the actuating member, the abutting element The dehydrator is characterized in that it returns to the engagement position by the spring force of the third spring.