Dehydrator

Abstract

To provide a vertical dehydrator capable of appropriately draining liquid overflowed from a mold.SOLUTION: A dehydrator comprises: a lower mold; a first upper mold lifted / lowered above the lower mold to be mold opened / closed and clamped with respect to the lower mold, and fills the lower mold with a liquid raw material while the mold is clamped; a second upper mold lifted / lowered above the lower mold to be mold opened / closed and clamped with respect to the lower mold, and pressurizes and dehydrates the liquid raw material in the lower mold while the mold is clamped; and a table capable of moving so that the lower mold placed on the upper surface faces the first upper mold or the second upper mold. The upper surface of the table is formed with a recessed portion on which the lower mold is placed, an outer circumferential weir vertically installed to surround the outer circumference of the recessed portion, and an inner circumferential weir vertically installed to surround the inner circumference of the recessed portion. The dehydrator further comprises a drainage device for draining liquid in the recessed portion.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present invention relates to a dehydration device for pressurizing and dehydrating a liquid material. [Background technology]

[0002] In recent years, as part of environmentally friendly manufacturing, the use of plastic gears has been increasing in place of metal gears. Patent Document 1 discloses a papermaking machine that pressurizes and dehydrates a liquid containing fiber pieces to create a base material for the plastic gears.

[0003] Patent Document 2 discloses a vertical injection molding machine in which a lower mold is placed on a turntable and an upper mold is raised and lowered to open, close, and clamp the mold. In such a vertical injection molding machine, electrical components (e.g., a power supply unit, a motor, etc.) are generally stored below the turntable. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2014-77541 A [Patent Document 2] Patent Publication No. 2022-24412 Summary of the Invention [Problem to be solved by the invention]

[0005] In the papermaking machine described in Patent Document 1, when the lower and upper dies are clamped to perform pressurized dehydration, a large amount of liquid overflows from the die. Therefore, if a papermaking machine with the configuration described in Patent Document 2 is adopted, there is a problem that the large amount of overflowing liquid falls through the gaps in the turntable and causes water to get on electrical components.

[0006] The present invention has been made to solve such problems in the prior art, and its object is to provide a vertical dewatering device that can properly drain liquid that has overflowed from a mold. [Means for solving the problem]

[0007] In order to solve the above-mentioned problems, the present invention provides a dehydration device which fills a mold with a liquid raw material and dehydrates it under pressure, comprising a lower mold, a first upper mold which is raised and lowered above the lower mold to open and close and clamp the mold relative to the lower mold, and which fills the lower mold with liquid raw material in the clamped state, a second upper mold which is raised and lowered above the lower mold to open and close and clamp the mold relative to the lower mold, and which pressurizes and dehydrates the liquid raw material in the lower mold in the clamped state, and a table which is movable so that the lower mold placed on its upper surface faces either the first upper mold or the second upper mold, and the upper surface of the table is formed with a recess on which the lower mold is placed, an outer periphery dam erected to surround the outer periphery of the recess, and an inner dam erected to surround the inner periphery of the recess, and further comprises a drainage device which drains liquid in the recess. Effect of the Invention

[0008] According to the present invention, a vertical dewatering device capable of properly draining liquid overflowing from a mold can be obtained. [Brief description of the drawings]

[0009] [Figure 1] FIG. [Diagram 2] FIG. [Diagram 3] 1A is a plan view and FIG. 1B is a cross-sectional view of a rotary table. [Figure 4] FIG. 1A shows a hose placed in the outer peripheral groove, and FIG. 1B shows electrical components installed below the rotary table. [Diagram 5] 13 is a schematic diagram showing a drainage mechanism that drains liquid through a drainage passage. FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] A papermaking machine 1 according to the present invention will be described below with reference to the drawings. Note that the embodiment of the present invention described below is an example of how the present invention is embodied, and the scope of the present invention is not limited to the description of the embodiment. Therefore, the present invention can be implemented by adding various modifications to the embodiment.

[0011] [Configuration of papermaking machine 1] The configuration of a papermaking machine 1, which is an example of a dewatering device, will be described with reference to Figures 1 and 2. Figure 1 is a side view of the papermaking machine 1. Figure 2 is a plan view of the papermaking machine 1. The papermaking machine 1 is an apparatus that produces a papermaking base material 3 (molded product) by filling a mold with a slurry 2 (liquid raw material) and dewatering it under pressure.

[0012] The slurry 2 is a liquid containing fiber pieces. More specifically, the slurry 2 is a mixture of water, fiber pieces (e.g., organic fibers), additives such as a fixing agent, and resin (e.g., high-strength, high-heat-resistant phenolic resin) in a predetermined ratio. However, the content ratio of the fiber pieces in the slurry 2 is not always constant and may vary slightly.

[0013] The papermaking substrate 3 is a cylindrical member that is the base of a resin gear. More specifically, a resin gear is manufactured by forming teeth on the outer peripheral surface of the cylindrical papermaking substrate 3 manufactured by the papermaking machine 1. The resin gear is used, for example, in the drive system of an automobile. Compared to metal gears, the resin gear manufactured from the papermaking substrate 3 reduces meshing noise and teeth rattle noise and can achieve weight reduction. However, the material manufactured from the papermaking substrate 3 is not limited to gears, and the use of the gear is not limited to parts inside and around the engine of an automobile.

[0014] As shown in Figures 1 and 2, the mold of the papermaking machine 1 is composed of two lower molds 11, a first upper mold 12, and a second upper mold 13. The lower mold 11 is supported by a support block 14. An insert 15 is housed within the lower mold 11. Furthermore, the lower mold 11 is held by a lower outer ring 16, and the second upper mold 13 is held by an upper outer ring 17. However, the number of lower molds 11 may be one.

[0015] The two lower dies 11 have the same shape. The lower dies 11 have a cylindrical outer shape. The diameter of the lower dies 11 corresponds to the outer dimensions of the papermaking substrate 3. The lower dies 11 are formed with a drainage passage 11a that penetrates in the vertical direction. The lower dies 11 are fixed to a support block 14. An insert 15 is placed on the upper surface of the lower dies 11. The lower dies 11 are disposed inside a lower outer ring 16.

[0016] The support block 14 supports the lower die 11 and the lower outer ring 16. More specifically, the lower die 11 is fixed to the upper surface of the support block 14. The support block 14 also supports the lower outer ring 16 so that it can be raised and lowered. The support block 14 also has a drainage passage 14a formed therein, which is connected to the drainage passage 11a of the lower die 11. The drainage passage 14a extends in the vertical direction as shown in FIG. 1, and then bends in the radial direction (horizontal direction) of the rotary table 21 as shown in FIG. 5. The drainage passage 14a is connected to drainage pumps 43a, 43b via connectors 41a, 41b, which will be described later with reference to FIG. 5. Furthermore, a ring-shaped recess 14b is formed on the upper surface of the support block 14 to receive the lowering lower outer ring 16.

[0017] The insert 15 is detachably placed on the upper surface of the lower mold 11. The insert 15 has a ring-shaped (cylindrical) outer shape. The outer dimensions of the insert 15 are smaller than the outer dimensions of the lower mold 11. The insert 15 is a metal part that constitutes part of the inner circumference of the papermaking substrate 3 (i.e., a resin gear).

[0018] The lower outer ring 16 has a tubular (typically cylindrical) outer shape. The lower outer ring 16 is disposed so as to surround the lower die 11. The lower outer ring 16 is supported from below by a lower outer ring cylinder (not shown). The lower outer ring 16 is configured to be able to rise and fall independently of the lower die 11 by the extension and contraction of the lower outer ring cylinder (not shown).

[0019] The first upper die 12 is disposed above the lower die 11 and the lower outer ring 16. The first upper die 12 has a cylindrical outer shape with an open lower surface and a closed upper surface. The inner diameter of the first upper die 12 corresponds to the inner diameter of the lower outer ring 16. Furthermore, a supply port 12a is provided on the upper surface of the first upper die 12, through which the slurry 2 is supplied from a supply device (not shown). The first upper die 12 is opened, closed, and clamped relative to the lower die 11 (more specifically, the lower outer ring 16) by transmitting the driving force of a first die opening / closing motor (not shown).

[0020] The second upper die 13 is disposed above the lower die 11. The second upper die 13 has a ring-shaped outer shape. The inner diameter of the second upper die 13 corresponds to the outer diameter of the insert 15. The outer diameter of the second upper die 13 corresponds to the inner diameter of the lower outer ring 16. The second upper die 13 is fixed to the inside of the upper outer ring 17.

[0021] The upper outer ring 17 is disposed above the lower outer ring 16. The upper outer ring 17 has a tubular (typically cylindrical) outer shape with an open lower surface and a closed upper surface. The inner diameter of the upper outer ring 17 corresponds to the outer diameter of the second upper mold 13 and the inner diameter of the lower outer ring 16. The upper outer ring 17 is disposed so as to surround the second upper mold 13. The second upper mold 13 and the upper outer ring 17 are raised and lowered together by transmitting the driving force of a second mold opening / closing motor (not shown) to open and close the mold relative to the lower mold 11 and the lower outer ring 16.

[0022] In the example of FIG. 1, one lower die 11 is supported on the support block 14, but the support block 14 may support a plurality of (e.g., four) lower dies 11 collectively. In other words, in the example of FIG. 1, one lower die 11 is arranged in the lower outer ring 16, but the lower outer ring 16 may hold a plurality of (e.g., four) lower dies 11 collectively. In addition, the number of first upper dies 12 corresponds to the number of lower dies 11 held by the lower outer ring 16. Similarly, the number of second upper dies 13 held collectively by the upper outer ring 17 corresponds to the number of lower dies 11 held by the lower outer ring 16.

[0023] 1 and 2, the papermaking machine 1 includes a frame 20, a rotary table 21 (table), a first movable die plate 22, and a second movable die plate 23. The frame 20 supports the rotary table 21, the first movable die plate 22, and the second movable die plate 23, as well as other components of the papermaking machine 1.

[0024] The rotary table 21 has a disk-shaped outer shape. The rotary table 21 is rotatably supported by the frame 20 via a rotary shaft 24 extending in the vertical direction. The rotary table 21 is formed with only the minimum number of taps (through holes). The taps provided on the rotary table 21 are closed with bolt caps.

[0025] A support block 14 is placed on the upper surface of the turntable 21. The two support blocks 14 according to this embodiment are arranged at an interval of 180° in the circumferential direction of the turntable 21 (in other words, arranged on opposite sides of the rotation shaft 24). Furthermore, the turntable 21 rotates around the rotation shaft 24 by the transmission of driving force from a table rotation motor (not shown).

[0026] More specifically, the rotating table 21 is configured to be movable (rotatable) so that the lower mold 11 placed via the support block 14 faces the first upper mold 12 or the second upper mold 13. In this embodiment, when one of the two lower molds 11 faces the first upper mold 12, the other lower mold 11 faces the second upper mold 13.

[0027] The first movable die plate 22 is supported by the frame 20 above the rotary table 21. The first upper die 12 is fixed to the lower surface of the first movable die plate 22. The first movable die plate 22 opens, closes, and clamps the first upper die 12 relative to the lower die 11 by transmitting the driving force of a first die opening / closing motor through a toggle link mechanism (not shown).

[0028] More specifically, as the first die opening / closing motor rotates in the first direction, the first movable die plate 22 descends together with the first upper die 12. As a result, as shown in Fig. 1(B), the lower end of the first upper die 12 comes into contact with the upper end of the lower outer ring 16, and a cavity (internal space) is formed between the lower die 11, the first upper die 12, and the lower outer ring 16 (i.e., the die is closed). Then, when further downward pressure is applied to the first movable die plate 22, the lower die 11 (lower outer ring 16) and the first upper die 12 are clamped together.

[0029] Then, with the lower mold 11 (lower outer ring 16) and the first upper mold 12 clamped together, the slurry 2 is supplied from the supply device through the supply port 12a, so that the inside of the lower mold 11 (more specifically, the space surrounded by the upper surface of the lower mold 11, the outer peripheral surface of the insert 15, and the inner peripheral surface of the lower outer ring 16) is filled with the slurry 2. With the lower mold 11 (lower outer ring 16) and the first upper mold 12 clamped together, the drainage pump 43a is driven, so that the liquid contained in the slurry 2 filled inside the lower mold 11 is drained (primary dehydration) through the drainage passages 11a, 14a and the connection part 41a at the first connection position.

[0030] On the other hand, when the first die opening / closing motor rotates in a second direction opposite to the first direction, the first movable die plate 22 rises together with the first upper die 12. As a result, the lower die 11 (lower outer ring 16) and the first upper die 12 are opened as shown in FIG.

[0031] The second movable die plate 23 is supported by the frame 20 above the rotary table 21. In addition, the second upper die 13 and the upper outer ring 17 are fixed to the lower surface of the second movable die plate 23. Furthermore, the second movable die plate 23 opens, closes, and clamps the second upper die 13 relative to the lower die 11 by transmitting the driving force of a second die opening / closing motor through a toggle link mechanism (not shown).

[0032] More specifically, the second movable die plate 23 is lowered together with the second upper die 13 and the upper outer ring 17 by rotating the second die opening / closing motor in the first direction. As a result, the lower end of the upper outer ring 17 comes into contact with the upper end of the lower outer ring 16, and a cavity (internal space) is formed between the lower die 11, the second upper die 13, the lower outer ring 16, and the upper outer ring 17 (i.e., the die is closed). When further downward pressure is applied to the second movable die plate 23, the upper outer ring 17 presses down the lower outer ring 16 against the support pressure of the lower outer ring cylinder, as shown in FIG. 1(B), and the second upper die 13 is lowered to a position where a part of the insert 15 enters inside the second upper die 13, and the lower die 11 (lower outer ring 16) and the second upper die 13 are clamped.

[0033] This causes the slurry 2 filled in the lower mold 11 to be pressurized and dehydrated. In addition, with the lower mold 11 (lower outer ring 16) and the second upper mold 13 clamped together, the drainage pump 43b is driven to drain the liquid contained in the slurry 2 filled in the lower mold 11 through the drainage passages 11a, 14a and the connection part 41b at the second connection position (secondary dehydration). As a result, the slurry 2 in the space surrounded by the upper surface of the lower mold 11, the lower surface of the second upper mold 13, the outer peripheral surface of the insert 15, and the inner peripheral surface of the lower outer ring 16 is compressed to become the papermaking substrate 3.

[0034] On the other hand, when the second die opening / closing motor rotates in a second direction opposite to the first direction, the second movable die plate 23 rises together with the second upper die 13 and the upper outer ring 17. As a result, the lower die 11 (lower outer ring 16) and the second upper die 13 are opened as shown in FIG.

[0035] The papermaking substrate 3 in the lower mold 11 is then removed from the lower mold 11 together with the insert 15 by a robot arm (not shown). The papermaking substrate 3 removed from the lower mold 11 is then dried in an oven, and teeth are formed on the outer circumferential surface to form a resin gear. A new insert 15 is then inserted by the robot arm into the lower mold 11 from which the papermaking substrate 3 was removed.

[0036] [Configuration of Rotary Table 21] Fig. 3 is a plan view (A) and a cross-sectional view (B) of the turntable 21. As shown in Fig. 3, the turntable 21 is formed with a shaft hole 21a and a recess 21b. The shaft hole 21a passes through the center of the turntable 21 in the thickness direction. A rotating shaft 24 is fixed to the shaft hole 21a. The recess 21b is recessed downward from the upper surface of the turntable 21. The recess 21b has a ring shape that is continuous in the circumferential direction so as to surround the rotating shaft 24 (in other words, the shaft hole 21a).

[0037] Further, an outer peripheral dam 21c and an inner peripheral dam 21d are formed on the upper surface of the turntable 21. The outer peripheral dam 21c is a ring-shaped wall erected so as to surround the outer periphery of the recess 21b. The inner peripheral dam 21d is a ring-shaped wall erected so as to surround the inner periphery of the recess 21b. The outer peripheral dam 21c and the inner peripheral dam 21d are continuous in the circumferential direction. That is, on the upper surface of the turntable 21, the bottom wall of the recess 21b is located at a lower position than the part outside the outer peripheral dam 21c and the part inside the inner peripheral dam 21d.

[0038] Furthermore, an outer peripheral groove 21e and an inner peripheral groove 21f are formed in the bottom wall of the recess 21b. The outer peripheral groove 21e and the inner peripheral groove 21f are recessed further downward from the bottom wall of the recess 21b. The outer peripheral groove 21e is a ring-shaped recess that continues in the circumferential direction along the inside of the outer peripheral dam 21c. The inner peripheral groove 21f is a ring-shaped recess that continues in the circumferential direction along the outside of the inner peripheral dam 21d.

[0039] The lower die 11 and the support block 14 are then placed in the recess 21b. Most of the liquid contained in the slurry 2 filled in the lower die 11 is discharged through the drainage passages 11a, 14a. Meanwhile, another part of the liquid overflows from between the lower die 11 and the support block 14. The liquid overflowing from between the lower die 11 and the support block 14 accumulates in the recess 21b, the outer peripheral groove 21e, and the inner peripheral groove 21f. Furthermore, as the turntable 21 rotates, the liquid in the recess 21b is collected in the outer peripheral groove 21e by centrifugal force.

[0040] FIG. 4A shows a hose 30 disposed in the outer circumferential groove 21e, and FIG. 4B shows an electrical component 31 disposed below the rotary table 21.

[0041] As shown in Fig. 4(A), one end of the hose 30 is disposed inside the outer circumferential groove 21e. The other end of the hose 30 is connected to a drainage pump (not shown) that sucks in liquid. When the drainage pump is driven, the liquid in the recess 21b (more specifically, in the outer circumferential groove 21e) is discharged through the hose 30. The hose 30 and the drainage pump constitute an example of a drainage device that drains the liquid in the recess 21b.

[0042] 4(B), electrical components 31 are installed below the rotary table 21. The electrical components 31 are, for example, any components that involve input and output of electric power, such as a power supply unit, a drainage pump, a motor, and an amplifier. Therefore, one or more power cables 31a, 31b, and 31c are detachably connected to the electrical components 31. The attachment portions (connectors) of the power cables 31a, 31b, and 31c to the electrical components 31 are covered with putties 31d, 31e, and 31f (coating members).

[0043] [Configuration of drainage mechanisms 40a, 40b] Fig. 5 is a schematic diagram showing drainage mechanisms 40a, 40b that drain liquid through drainage passages 11a, 14a. As shown in Fig. 5, the papermaking machine 1 is equipped with drainage mechanisms 40a, 40b. The drainage mechanisms 40a, 40b are supported by the frame 20 on the radial outside of the turntable 21. The drainage mechanisms 40a, 40b are also arranged at positions that can face the support block 14 in the horizontal direction. The drainage mechanisms 40a, 40b are also arranged at positions spaced apart (at 180° intervals) in the circumferential direction of the turntable 21.

[0044] The drainage mechanism 40a drains liquid from the support block 14 supporting the lower die 11 facing the first upper die 12. The drainage mechanism 40a includes a connection part 41a (first connection part), a drainage cylinder 42a, and a drainage pump 43a. The drainage mechanism 40b drains liquid from the support block 14 supporting the lower die 11 facing the second upper die 13. The drainage mechanism 40b includes a connection part 41b (second connection part), a drainage cylinder 42b, and a drainage pump 43b.

[0045] The connection part 41a is supported by the frame 20 so as to be movable in the radial direction of the turntable 21 between a first connection position shown in Fig. 5(B) and a first retracted position shown in Fig. 5(A). The drain cylinder 42a is an actuator that moves the connection part 41a between the first connection position and the first retracted position. Specific examples of the actuator include an air cylinder, a hydraulic cylinder, and an electric motor. The drain pump 43a sucks liquid from the support block 14 through the connection part 41a at the first connection position.

[0046] The first connection position is a position of the connection part 41a connected to the support block 14 supporting the lower die 11 facing the first upper die 12. A drainage passage is provided inside the connection part 41a, which connects the drainage passage 14a of the support block 14 and the drainage pump 43a when in the first connection position. The first retracted position is a position of the connection part 41a separated from the support block 14 and retracted to the outside of the turntable 21.

[0047] The connection part 41b is supported by the frame 20 so as to be movable in the radial direction of the turntable 21 between a second connection position shown in Fig. 5(B) and a second retracted position shown in Fig. 5(A). The drain cylinder 42b is an actuator that moves the connection part 41b between the second connection position and the second retracted position. Specific examples of the actuator include an air cylinder, a hydraulic cylinder, and an electric motor. The drain pump 43b sucks liquid from the support block 14 through the connection part 41b in the second connection position.

[0048] The second connection position is a position of the connection part 41b connected to the support block 14 supporting the lower die 11 facing the second upper die 13. A drainage passage is provided inside the connection part 41b, which connects the drainage passage 14a of the support block 14 and the drainage pump 43b when in the second connection position. The second retracted position is a position of the connection part 41b separated from the support block 14 and retracted to the outside of the turntable 21.

[0049] In a state where one of the two lower molds 11 (in other words, the two support blocks 14) faces the first upper mold 12 and the other faces the second upper mold 13, the drainage cylinders 42a, 42b are extended to move the connection part 41a to the first connection position and the connection part 41b to the second connection position. Then, the drainage pumps 43a, 43b are driven to drain the liquid from the support block 14. Furthermore, before rotating the turntable 21, the drainage cylinders 42a, 42b are contracted to move the connection part 41a to the first retracted position and the connection part 41b to the second retracted position.

[0050] According to the above embodiment, for example, the following advantageous effects are achieved.

[0051] According to the above embodiment, by placing the lower die 11 in the recess 21b surrounded by the outer peripheral weir 21c and the inner peripheral weir 21d, it is possible to prevent liquid overflowing from the lower die 11 (more specifically, the gap between the lower die 11 and the support block 14) from overflowing below the turntable 21. This makes it possible to prevent the electrical components 31 arranged below the turntable 21 from being wet.

[0052] Furthermore, according to the embodiment described above, by providing the outer peripheral groove 21e and the inner peripheral groove 21f in the bottom wall of the recess 21b, the heights of the outer peripheral weir 21c and the inner peripheral weir 21d are increased. As a result, liquid can be more effectively prevented from overflowing below the turntable 21.

[0053] Furthermore, according to the above embodiment, by installing a hose 30 for draining liquid from within the recess 21b in the outer peripheral groove 21e, the liquid that has collected in the outer peripheral groove 21e due to the centrifugal force caused by the rotation of the turntable 21 can be efficiently drained.

[0054] Furthermore, according to the above embodiment, the liquid is drained from the support block 14 by the drainage mechanisms 40a, 40b arranged radially outside the turntable 21. This eliminates the need to provide a drainage passage below the turntable 21 (i.e., a through hole that passes through the turntable 21 in the up-down direction). As a result, the electrical components 31 arranged below the turntable 21 can be more effectively prevented from becoming wet.

[0055] Furthermore, according to the above embodiment, by covering the attachment portions of the power cables 31a, 31b, and 31c to the electrical component 31 with putties 31d, 31e, and 31f, it is possible to prevent the electrical component 31 from shorting out due to liquid spilling out below the turntable 21 despite the above measures being taken. [Explanation of symbols]

[0056] 1...papermaking machine, 2...slurry, 3...papermaking base material, 11...lower mold, 11a, 14a...drainage passage, 12...first upper mold, 12a...supply port, 13...second upper mold, 14...support block, 14b, 21b...recess, 15...insert, 16...lower outer ring, 17...upper outer ring, 20...frame, 21...rotary table, 21a...shaft hole, 21c...peripheral dam, 21d...inner dam, 2 Reference Signs: 1e...outer peripheral groove, 21f...inner peripheral groove, 22...first movable die plate, 23...second movable die plate, 24...rotating shaft, 30...hose, 31...electrical components, 31a, 31b, 31c...power cables, 31d, 31e, 31f...putty, 40a, 40b...drainage mechanism, 41a, 41b...connection parts, 42a, 42b...drainage cylinder, 43a, 43b...drainage pump

Claims

1. In a dehydration device in which liquid raw material is filled into a mold and dehydrated under pressure, The lower mold and a first upper mold that is raised and lowered above the lower mold to open / close and clamp the lower mold, and fills the lower mold with a liquid raw material in the clamped state; a second upper mold that is raised and lowered above the lower mold to open / close and clamp the lower mold, and pressurizes and dehydrates the liquid raw material in the lower mold in the clamped state; a table that is movable so that the lower mold placed on an upper surface faces the first upper mold or the second upper mold, The top surface of the table is A recess in which the lower mold is placed; an outer periphery dam erected so as to surround the outer periphery of the recess; an inner peripheral dam is formed so as to surround the inner periphery of the recess; The dehydration apparatus further comprises a drainage device for draining liquid within the recess.

2. The bottom wall of the recess has a peripheral groove extending along the peripheral dam; 2. The dewatering apparatus according to claim 1, further comprising an inner circumferential groove extending along the inner circumferential weir.

3. the table has a disk shape and rotates around a rotation axis extending in a vertical direction, The dewatering device according to claim 2, characterized in that the recess, the outer circumferential dam, the inner circumferential dam, the outer circumferential groove, and the inner circumferential groove are continuous in a circumferential direction around the rotation axis on the upper surface of the table.

4. The drainage device includes: A hose having one end disposed within the outer circumferential groove; 4. The dewatering device according to claim 3, further comprising a drainage pump connected to the other end of the hose for sucking liquid in the outer peripheral groove through the hose.

5. a support block placed in the recess and supporting the lower die; a first connection portion that moves in a radial direction of the table between a first connection position that is connected to the support block that supports the lower die facing the first upper die, and a first retracted position that is away from the support block and retracts to the outside of the table; a second connection portion that moves in a radial direction of the table between a second connection position that is connected to the support block that supports the lower mold facing the second upper mold, and a second retracted position that is away from the support block and retracts to the outside of the table; The dewatering device according to claim 3 , further comprising a drainage pump that draws liquid from the support block through the first connection portion at the first connection position and the second connection portion at the second connection position.

6. An electrical component installed below the table; A cable that is detachable from the electrical component; The dewatering device according to claim 1, further comprising a covering member for covering an attachment portion of the cable to the electrical component.

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