CN112629098A

CN112629098A - Movable low-temperature working table

Info

Publication number: CN112629098A
Application number: CN202011124720.0A
Authority: CN
Inventors: 藤井稔
Original assignee: JCR Pharmaceuticals Co Ltd
Current assignee: JCR Pharmaceuticals Co Ltd
Priority date: 2015-12-10
Filing date: 2016-12-07
Publication date: 2021-04-09
Also published as: EP3388762A4; US20180283762A1; EP3388762A1; WO2017099105A1; JP7152551B2; HK1258928A1; CN108369050A; JP7145560B2; CN108369050B; JP2018004240A; JP2021105510A

Abstract

The invention provides a movable workbench which can move a working place and can work at a low temperature, such as-80 ℃ or lower. A movable table, wherein a table having a working space forming member for forming a working space for working at a low temperature and a refrigerant storage tank for storing a refrigerant is mounted on a base provided with a moving member, the working space forming member has a side wall and a bottom wall so as to form a working space having an open upper surface, the upper surface of the working space is open at an upper side of the table, the refrigerant storage tank stores the bottom wall of the working space forming member so as to cool a gas phase in the working space when the refrigerant is stored in the refrigerant storage tank, and the moving member is provided on a lower surface of the base so as to be movable in a state where the refrigerant storage tank is filled with the refrigerant.

Description

Movable low-temperature working table

The application is a divisional application of PCT patent application PCT/JP2016/086319 (application date is 2016, 12 and 7 days in 2016, Chinese patent application number is 201680072207.7, and invention name is 'mobile low-temperature workbench') entering the Chinese national stage at 6 and 8 days in 2018.

Technical Field

The present invention relates to a mobile workbench for providing a work space for working at a low temperature, for example, to a mobile workbench including: a work table having a work space forming member for forming a work space for working at a low temperature and a refrigerant storage tank for storing a refrigerant is mounted on a movable table having a base with a moving member.

Background

Operation at low temperatures is generally carried out in a low-temperature chamber. When a large space is not required for the work, a cold box for storing a cold-retaining agent, ice, dry ice, or the like is prepared, and the work is performed in the cold box.

The low-temperature chamber has an advantage that, when the operation is performed at a low temperature, a sufficient working space can be secured and the operation can be performed under sufficient temperature management. However, the installation of the low-temperature chamber imposes a large economic burden, and the temperature in the low-temperature chamber during operation in the low-temperature chamber is limited to approximately-50 ℃ from the viewpoint of safety of workers, and it is difficult to perform operation in the low-temperature chamber at a temperature exceeding its low temperature, for example, at a temperature of-80 ℃ or lower.

In addition, although the cooling box has an advantage that the work place can be moved when performing work at low temperature, the work space is limited, and it is difficult to perform work under sufficient temperature management. In addition, even if dry ice is used as the refrigerant, since the sublimation temperature of dry ice is-79 ℃, it is difficult to operate at a low temperature of-80 ℃ or lower in the cold box.

A low-temperature stage for processing food at a low temperature in which a stage is kept at a low temperature by cold air blown from a cooling device to the stage is known (patent document 1). The table is fixed, and cannot be moved to a work place, and it cannot be applied to a work at a low temperature of-80 ℃.

Documents of the prior art

Patent document

Patent document 1: japanese patent laid-open No. 11-235150.

Disclosure of Invention

Problems to be solved by the invention

The object of the present invention is to provide a mobile work table capable of moving a work place and performing work at a low temperature, for example, work at a low temperature of-80 ℃.

Means for solving the problems

In the studies for the above object, the present inventors have conducted earnest studies and, as a result, have succeeded in developing a mobile table in which: the work bench is supported on the base with the moving member, and can move the work place and perform work at low temperature. That is, the present invention includes the following.

1. A mobile work table, wherein,

a work table having a work space forming member for forming a work space for working at a low temperature and a refrigerant storage tank for storing a refrigerant is placed on a base having a moving member,

the work space forming member has a side wall and a bottom wall in such a manner as to form a work space whose upper surface is open, the upper surface of the work space being free on the upper side of the table,

the refrigerant receiving groove receives the bottom wall of the working space forming member to cool the bottom wall of the working space forming member when the refrigerant is received in the refrigerant receiving groove, thereby cooling the gas phase in the working space,

the moving member is provided on a lower surface of the base to be able to move the table in a state where the refrigerant storage groove is filled with the refrigerant.

2. The mobile table according to claim 1, further comprising: a temperature measuring part arranged in the working space so as to detect the temperature of the working space when working at low temperature; and a temperature display unit for displaying the temperature measured by the temperature measurement unit.

3. The mobile table according to the above 2, further comprising: a temperature recording unit having a function of recording the temperature measured by the temperature measuring unit.

4. The mobile workbench in accordance with any one of the above claims 1 to 3, wherein the side walls and bottom wall of the refrigerant receiving tank are insulated from the outside by an insulating member.

5. The mobile workbench in accordance with any one of the above claims 1 to 4, wherein the refrigerant stored in the refrigerant storage tank is liquid nitrogen.

6. A mobile workbench as in any of claims 1-5 above, further provided with a cover for closing the upper, freed surface of the workspace.

7. The mobile workbench according to any one of the above 1 to 6, comprising a stopper (stopper) capable of fixing the moving member so as to be capable of preventing the movement of the base.

8. The movable table according to the above 7, further comprising a locking portion which is interlocked with the stopper,

the locking portion can cause the cover to be locked to the table so that the upper surface of the working space is closed by the cover when the fixing of the moving member by the stopper is released, and can release the locking when the moving member is fixed by the stopper.

9. A mobile workbench in accordance with any of claims 1 to 8, further provided with a handle for gripping by a worker.

10. The mobile workbench in accordance with the above 9, wherein the handle is provided at both front and rear sides of the mobile workbench.

11. The mobile table according to any one of the above 1 to 10, further comprising a warning generation unit capable of generating a warning when the temperature measured by the temperature measurement unit is outside a preset temperature range.

12. A mobile workbench in accordance with any of claims 1 to 11, wherein the mobile member is a caster (caster).

13. A mobile work table 2, wherein,

a table 2 provided with a working space forming member 4 forming a working space 5 for working at a low temperature and a refrigerant accommodating groove 6 for accommodating a refrigerant is carried on a base 3 provided with a moving member 15,

the work space forming member 4 has side walls and a bottom wall in such a manner as to form a work space 5 whose upper surface is open, the upper surface of the work space 5 is liberated on the upper side of the table 2,

the refrigerant receiving groove 6 receives the bottom wall of the working space forming member 4 to cool the bottom wall of the working space forming member 4 when the refrigerant is received in the refrigerant receiving groove 6, thereby cooling the gas phase in the working space 5,

the moving member 15 is provided on the lower surface of the base 3 to be able to move the table 2 in a state where the refrigerant storage tank 6 is filled with the refrigerant.

Effects of the invention

According to the present invention, it is possible to move a work place and perform work at a low temperature, for example, a temperature of-80 ℃ or lower.

Drawings

Fig. 1-1 shows an external side view of a mobile table of embodiment 1.

Fig. 1 to 2 show an external front view of the mobile workbench according to embodiment 1.

Fig. 1 to 3 are top views showing the appearance of the mobile workbench according to example 1.

Fig. 2-1 is a partial sectional view of a plane passing perpendicularly through the center line in the longitudinal direction of the mobile table 1 according to embodiment 1 in a state where the working space is covered. In the figure, the cover 12, the working space forming member 4, the refrigerant storage tank 6, the heat insulating member 8, the duct (duct)9, the housing 7 excluding the leg 7c, the working space 5, the liquid nitrogen 10, and the gap 11 are shown as cross-sectional views.

Fig. 2-2 is a partial sectional view based on a plane passing perpendicularly through the center line in the short side direction of the mobile table 1 of embodiment 1 in a state where the working space is covered. In the figure, the lid 12, the working space forming member 4, the refrigerant storage tank 6, the heat insulating member 8, the case 7 excluding the leg 7c, the working space 5, the liquid nitrogen 10, and the gap 11 are shown as a sectional view.

Detailed Description

In the present invention, the term "working space for working at a low temperature" refers to a space which is filled with a gas phase at a temperature lower than the outside air and is used for working in an environment at a temperature lower than the outside air. The gas phase is generally air or a mixture of air and the refrigerant in the vaporized refrigerant-receiving tank. In the present invention, the low temperature means a temperature of approximately-51 ℃ or lower, and when liquid nitrogen (boiling point: -196 ℃) is used as the refrigerant, the low temperature means a temperature of approximately-100 ℃ or lower, for example, a temperature of-120 ℃ or lower and a temperature of-130 ℃ or lower. The temperature range can be adjusted properly according to the working contents, for example, -51 to-200 ℃, -80 to-200 ℃, -100 to-180 ℃, -120 to-180 ℃, -130 to-185 ℃ and the like.

The work space is provided on the upper side of the table as a concave space having an open upper surface so that a worker can work easily. The gas phase cooled to a temperature lower than the outside air has a higher specific gravity than the outside air, and therefore remains in the concave space, and as a result, the working space is kept at a low temperature. The workspace is a generally rectangular space separated by a workspace-forming member having side walls and a bottom wall and an open upper surface. The workspace forming member is preferably formed of a material which can maintain strength even at a low temperature exceeding-100 ℃, for example, a stainless steel material, a titanium alloy, or the like. Stainless steel or titanium alloy is also preferable as the material from the viewpoint of preventing rust due to dew condensation caused by temperature change. As a material for forming the working space forming member, it is also preferable to subject the surface to rust prevention processing such as fluorine processing.

A refrigerant storage groove is provided on the lower side of the bottom wall of the working space forming member so as to receive the bottom wall from the lower side. The refrigerant storage groove is disposed so as to cool the bottom wall and the side wall of the working space forming member when the refrigerant is stored therein, thereby enabling the gas phase (air) in the working space to be cooled to a desired low temperature. The refrigerant storage tank may be substantially constituted by a side wall and a bottom wall, and may be open at the top. The refrigerant storage tank is preferably formed of the same material as the working space forming member, which can maintain strength even at a low temperature of approximately-100 ℃ and does not rust.

The refrigerant storage groove is disposed so as to receive the bottom wall of the working space forming member from below, and when the refrigerant is stored in the refrigerant storage groove, a gap is generated between the surface of the refrigerant and the bottom wall of the working space forming member. When the refrigerant is stored in the refrigerant storage tank, the bottom wall and the side wall of the working space forming member are cooled by the refrigerant. In addition, since the gap is filled with the vaporized refrigerant, the bottom wall and the side wall of the working space forming member are also cooled by the vaporized refrigerant. Due to the cooling of the workspace-forming member, the air within the workspace is also cooled. By immersing the bottom wall (and the side wall) of the workspace forming member in the refrigerant, the gas phase (air) in the workspace can be cooled more efficiently. The cooled gas phase (air) has a heavier specific gravity than the outside air, and therefore, is accumulated in the concave working space, and the air in the working space is gradually cooled.

The side wall and/or the bottom wall of the working space forming member may be provided with a vent hole so that a low-temperature gas phase staying in a gap between the surface of the refrigerant and the working space forming member can flow into the working space through the vent hole. The gas phase in the working space is efficiently cooled due to the inflow of the low-temperature gas phase from the vent hole.

The refrigerant stored in the refrigerant storage tank is not particularly limited, but examples thereof include liquid nitrogen and ethanol added with dry ice. When liquid nitrogen is stored as the refrigerant, the temperature in the working space can be cooled to a low temperature of-160 ℃ or lower, for example, -180 ℃ or lower, or the working space can be continuously operated at a low temperature, for example, at a temperature of-130 ℃ or lower or-160 ℃ or lower for a long period of time.

The refrigerant storage tank is provided with an injection port for injecting the refrigerant. The shape, position, and the like of the injection port are not particularly limited as long as the refrigerant can be injected into the refrigerant storage tank, and the open upper side of the refrigerant storage tank may be used as the injection port. A duct that passes through the refrigerant storage groove and that penetrates to the outside of the table may be provided, and an opening on the outside of the duct may be used as an injection port for the refrigerant. When the opening on the outer side of the duct is an injection port, the injection port can be an exhaust port for the vaporized refrigerant. Further, an openable/closable lid may be provided at the injection port, and the lid may be closed at a time other than the injection operation of the refrigerant to suppress vaporization of the refrigerant from the injection port.

When liquid nitrogen is stored as the refrigerant in the refrigerant storage tank, the liquid nitrogen is warmed by the outside air and gasified. If the amount of liquid nitrogen is reduced to a certain amount or less by vaporization, it is difficult to keep the gas phase (air) in the work space at a low temperature. Therefore, in order to keep the gas phase (air) in the working space at a low temperature for a long time, it is preferable to insulate the refrigerant storage tank from the outside. In this case, it is preferable that the working space forming member is also insulated from the outside at the same time.

The heat insulation between the refrigerant storage tank and the working space forming member and the outside is achieved by disposing a heat insulating material between the side walls and the bottom wall of the refrigerant storage tank and between the side walls of the working space forming member and the outside of the table. The heat insulating material which can be used as a material of the heat insulating member is not particularly limited, but a foamed plastic such as a foamed polystyrene is preferably used as the heat insulating member.

The heat insulating member is disposed, for example, so as to fill a gap formed between the refrigerant storage groove and the case when the refrigerant storage groove is stored in the case. In this case, the heat insulating member is preferably fixed to the refrigerant storage groove so as to cover the outside of the side wall and the bottom wall of the refrigerant storage groove, or fixed to the case so as to cover the inner wall surface of the case that stores the refrigerant storage groove. However, the heat insulating member may not be fixed at any place. Further, the case may be made of stainless steel, titanium, or the like having a cavity, and the case may be formed of a member in which a heat insulating material is accommodated in the cavity, so that the case functions as a heat insulating member. Similarly, the refrigerant storage tank may function as a heat insulating member.

The heat insulating member may be made of stainless steel, titanium, or the like, having a hollow space filled with air or depressurized to a pressure close to vacuum. The hollow space itself or the gas in the hollow space functions as a heat insulating material. In this case, the case can also be made to function as a heat insulating member by forming the case from a member made of stainless steel, titanium, or the like, which has a cavity filled with air or depressurized to a pressure close to vacuum. Similarly, the refrigerant storage tank can also be made to function as a heat insulating member. A member made of stainless steel having a cavity decompressed to near vacuum is particularly suitable as a heat insulating member for insulating the refrigerant storage tank from the outside. In the present invention, the term "heat insulation" means that the heat transfer and heat transfer are reduced by physical and chemical properties of the heat insulating material.

In the present invention, the working space forming member and the refrigerant accommodating groove are carried on the base with the moving member so as to be movable as an integrated table in a state where the refrigerant accommodating groove is filled with the refrigerant. Casters can be preferably used as the moving member. The working space forming member and the refrigerant accommodating groove are accommodated in the housing in such an arrangement that the refrigerant accommodating groove receives the working space forming member from below, for example, so that they form an integrated table. In the case where the pipe is provided, the pipe penetrates the heat insulating member and the housing (or the housing integrated with the heat insulating member) to communicate the refrigerant storage tank and the outside of the table.

When the table is placed on the base with the moving member, the table is fixed to the base by the locking portion so as to prevent the table from falling from the base. However, the base and the table may be formed integrally, and for example, a housing of the table may be formed integrally with the base so that the working space forming member and the refrigerant accommodating tank can be accommodated in the housing. In this way, in the case where the base and the housing are formed integrally, the housing formed integrally with the base can be regarded as a part of the table, and the table as a whole can be understood as a mobile table in which the table is carried on the base with the moving member.

The movable table of the present invention is a table for working at low temperature. Therefore, it is preferable to confirm that the working space is kept at a low temperature during the low-temperature operation. Therefore, it is preferable that a temperature measuring unit be provided in the work space so that the temperature of the work space can be detected. By displaying the temperature measured by the temperature measuring unit on the temperature display unit, the worker can work while confirming the temperature displayed on the temperature display unit. In some cases, it is required to record the temperature measured by the temperature measuring unit in order to manage the working process. Therefore, a temperature recording unit incorporating a memory for recording the temperature measured by the measurement unit may be provided. By providing the temperature recording unit, the measured temperature can be recorded over time.

In order to ensure that the mobile table can be operated at a low temperature, the mobile table may further include a warning generation unit configured to generate a warning when the temperature measured by the temperature measurement unit has risen to a temperature higher than a preset temperature. For example, when performing work that should be performed at-130 ℃ or less, if the warning generation section is set in such a manner that the warning generation section issues a warning when the temperature exceeds-135 ℃, the worker receiving the warning can interrupt the work and wait until the temperature of the work space sufficiently drops. In this way, it is possible to avoid performing the operation at a temperature higher than a predetermined temperature. The mobile workbench provided with the cover body can reliably restrain the temperature of the working space from rising to a temperature higher than the set temperature and can efficiently cool the working space by closing the cover body when the work is interrupted. The warning can be given by visual display, light emission, and/or sound output, but a buzzer sound is effective.

The mobile table of the present invention is used by receiving a cryogenic refrigerant such as liquid nitrogen. Therefore, it is preferable to provide a member for ensuring safety of the worker on the movable table. As such a means for ensuring safety, for example, a stopper capable of fixing the movable member may be provided so that unintended movement of the movable table can be prevented during work of the worker. Such a stopper is preferably easy to operate by a worker, and in the case where the moving member is a caster, a foot brake can be exemplified as a preferable example thereof. In addition, if the movable table is provided with a handle for a worker to hold, a holding portion for stopping operation may be provided on the handle so that the stopping operation can be performed by hand. The grip portion is linked to the stopper by a wire, and the wire is pulled upward by gripping the grip portion, whereby the stopper is moved to a position where the caster can be fixed. The grip portion is engaged by the engagement portion at a position pulled upward by the wire, and operates in this state. When the movable table is moved, the latch is released to return the grip portion to the original position, and the stopper is moved to a position where the casters are opened.

The movable table may be provided with a cover for closing the upper surface of the work space so as to keep the temperature of the gas phase in the work space at a low temperature during movement. Since the gas phase in the working space and the outside air may be mixed during the movement of the movable table to increase the temperature in the working space, the upper surface of the working space is closed by the lid body, and thus the temperature increase in the working space can be prevented. In addition, even when the operation is temporarily interrupted during the operation, the cover body is closed, whereby the working space can be reliably kept at a low temperature, and the temperature in the working space that has risen during the operation can be efficiently cooled.

In the case where the cover is provided to the mobile workbench, the cover is opened only when the mobile member is fixed by the stopper, and the mobile workbench can be operated, so that the worker can be prevented from operating in a state where the worker forgets to fix the mobile member, and the safety of the mobile workbench can be further improved. For example, a locking portion of the cover may be provided on the table or the base, and the locking portion may be configured to allow the cover to be locked to the table so as not to be openable and closable when the stopper is in the position for opening the movable member, and to allow the cover to be openable and closable when the stopper is in the position for fixing the movable member by releasing the locking of the cover to the table.

As described above, the portable workbench according to the present invention may be provided with a handle for a worker to grip. In the case of a mobile table provided with a handle, the mobile table becomes shaped like a trolley. In this case, the side where the handle is provided is referred to as the rear side, and the opposite side is referred to as the front side. The handles may also be provided on both sides of the mobile workbench, in which case the mobile workbench is not distinguished by a rear side and a front side, but for convenience, may also be provided. The worker holds the handle and pushes the movable workbench by hand, so that the movable workbench can be moved to a place for implementing work, and the working efficiency is improved.

The movable table may be provided with a function of adjusting the height of the table in accordance with the physique, work content, and the like of the worker. The function can be added by, for example, providing a foot attaching table capable of extending and contracting the foot on the upper side of the base, placing the table on the foot attaching table, and disposing a jack in a gap between the lower surface of the table portion of the foot attaching table and the base so as to support the lower surface of the table portion of the foot attaching table. By operating the jack in the upward direction, the table portion of the leg attachment table is pushed upward and moved, and the leg of the leg attachment table extends, and the table is moved upward. When the jack is operated in the downward direction, the table portion of the leg support moves downward by the weight of the table, the legs of the leg support contract, and the table moves downward. By operating the jack in this way, the worker can adjust the height of the table at will.

Examples

The mobile table according to the present invention will be described in further detail below with reference to examples, but the present invention is not intended to be limited to the examples.

(example 1)

As shown in fig. 1-1 to 2-2, the mobile workbench 1 of the present embodiment has a workbench 2 supported on a base 3. The table 2 includes: a working space forming member 4 forming a working space 5, and a refrigerant storage tank 6 for storing refrigerant, and a housing 7 storing the working space 5 and the refrigerant storage tank 6. The inside of the case is a substantially rectangular parallelepiped space, and the insides of the side walls and the bottom wall of the case 7 are covered with a heat insulating member 8 made of a foamed plastic. The upper side of the housing 7 is open. A refrigerant accommodating groove 6 is provided in the housing 7. The refrigerant storage tank 6 has a substantially rectangular parallelepiped shape with an open upper side so that the side walls and the bottom wall thereof are surrounded by the heat insulating member 8, and has a substantially rectangular space for storing the refrigerant therein. Inside the housing 7, a working space forming member 4 is further provided. The work space forming member 4 forms a substantially rectangular space whose upper surface is open on the inner side thereof by the side wall and the bottom wall. This space becomes a working space 5 for performing work at a low temperature. A flange 4a extends outward from the upper end of the side wall of the working space forming member 4. The flange 4a is mounted on a step 7a provided inside the upper end of the side wall of the case, and the end of the flange 4a abuts against the side wall of the case 7. The flange 4a prevents the working space forming member 4 from moving laterally within the housing 7, and supports the working space forming member 4 so as to form a space between the bottom wall of the working space forming member 4 and the bottom wall of the refrigerant accommodating groove 6. The refrigerant is received in the space.

The duct 9 is provided so as to penetrate the housing 7, the heat insulating member 8, and the refrigerant storage tank 6. The pipe 9 has an open port on the outside of the housing 7 and the inside of the refrigerant storage tank 6. The open port of the duct 9 provided outside the housing 7 serves as an injection port for injecting the refrigerant into the refrigerant storage tank 6. The open port on the outside of the housing 7 is provided so as to be located above the open port on the inside of the refrigerant storage tank 6, so that the refrigerant flows into the refrigerant storage tank 6 when the refrigerant is injected. In addition, when liquid nitrogen is stored as the refrigerant into the refrigerant storage tank 6, the pipe also functions as an exhaust port for the vaporized liquid nitrogen.

Fig. 2-1 and 2-2 show a state in which liquid nitrogen 10 is stored as the refrigerant in the refrigerant storage tank 6. The liquid nitrogen 10 contained in the refrigerant containing tank 6 cools the bottom wall and the side wall of the workspace forming member 4 above the liquid surface thereof. In addition, the gap 11 between the refrigerant accommodating groove 6 and the working space forming member 4 is filled with nitrogen gas in which liquid nitrogen is vaporized. The nitrogen is vaporized at about-195 deg.c under atmospheric pressure, and thus the bottom wall and the side wall of the workspace forming member 4 are also cooled by the vaporized nitrogen.

In fig. 1-1 to 2-2, the open upper surface of the work space 5 is closed by a cover 12. In this state, the lower surface of the end of the lid 12 is mounted on the step 7a provided inside the upper end of the housing side wall, and the end of the lid 12 abuts against the side wall of the housing 7, so that the lateral movement of the lid 12 is prevented, and the working space is cut off from the outside air. The lid 12 is provided with a handle 12 a. The lid 12 is closed in principle, and when the movable table 1 is moved, there is a fear that the gas phase and the outside air in the working space 5 are mixed and the temperature in the working space 5 rises. When the worker works in the work space 5, the worker grasps the handle 12a and removes the cover 12 to open the upper surface of the work space 5. When the temperature in the working space 5 rises to a temperature higher than the predetermined temperature during the work, the worker temporarily stops the work, closes the cover 12, confirms that the temperature in the working space 5 has dropped to the predetermined temperature, then removes the cover 12, and resumes the work.

Four corners of the bottom plate 7b of the housing 7 are provided with legs 7c, respectively. The foot 7c can be considered as a part of the housing 7 in this embodiment. The leg 7c is fixed at its lower end to the upper surface of the base 3 by a locking portion, and the entire table 2 is fixed to the base 3 by the fixing by the locking portion. The base 3 is a flat plate-like member having a substantially rectangular shape when viewed from above. Vertical rods 13 extending upward substantially perpendicularly from the base near both ends thereof are provided on one upper surface of the base, and horizontal rods 14 are laid between the vertical rods 13. The bar serves as a handle when the worker moves the manual table 1 by hand. For convenience, the side provided with the handle is referred to as the rear side of the mobile workbench 1, and the opposite side thereof is referred to as the front side.

Casters 15 are provided as moving means at four corners of the lower surface of the base 3. The rear caster is provided with a foot brake 16 as a stopper to fix the caster. The casters 15 are fixed by the foot brakes 16 during the operation of the working space 5 and during the injection of the refrigerant into the refrigerant storage tank 6, so that the movement of the movable table 1 that is not intended by the worker during the operation can be prevented, and the safety of the operation can be improved.

The working space 5 is provided with a temperature measuring unit 17, and the temperature measured by the temperature measuring unit is displayed on a liquid crystal screen of a temperature display unit 18 of the horizontal bar 14 attached to the handle. The temperature recording unit incorporates a memory capable of recording the temperature measured by the temperature measuring unit 17, and the recorded temperature can be read. This makes it possible to verify that the work to be performed is performed at a low temperature, and therefore the movable table 1 is particularly suitable for work requiring process management. Further, an alarm generating section 19 that generates a buzzer sound when the temperature measured by the temperature measuring section 17 becomes a predetermined temperature or higher is provided adjacent to the temperature display section 18.

Hereinafter, an operation of processing frozen cells will be described as an example of an operation using the movable table 1. The working process is a process of transferring the medical frozen cells stored in the freezing bag from the storage to the transport vehicle.

First, in a state where the lid body 12 is closed, liquid nitrogen is injected as a refrigerant into the refrigerant storage tank 6 from the open port of the mobile table 1. During the injection of the liquid nitrogen, the casters 15 are fixed by the foot brake 16 in order to prevent the movement of the movable table 1. After the injection of liquid nitrogen is completed, the foot brake 16 is released, and the movable table 1 is pushed by holding the handle 14 and moved to the side of the cell storage container for storing frozen cells.

The caster 15 is fixed by the foot brake 16, and it is checked whether or not the temperature displayed on the temperature display unit 18 is equal to or lower than a predetermined temperature. After confirming that the displayed temperature is equal to or lower than the predetermined temperature, the alarm generating unit 19 is turned on to generate a buzzer sound when the temperature measuring unit 17 detects a temperature equal to or higher than the predetermined temperature. In addition, the temperature recording unit is operated to record the temperature during operation.

The lid 12 is removed, and the frozen cells stored in the freezing bag are taken out from the cell storage container and transferred into the working space 5. After confirming that the freezing bag is not broken and the lot number of the frozen cells is confirmed in the work space 5, the lid 12 is closed. The foot brake 16 is released, the movable table 1 is pushed by holding the handle 14, and the platform is moved to stop at the loading platform of the transport vehicle for transporting frozen cells. The caster 15 is fixed by the foot brake 16, and the lid 12 is detached. The frozen cells are taken out from the work space 5, and the cells are transferred to a container for cell transportation which is cooled to a predetermined temperature in advance.

When the alarm generating unit 19 emits a buzzer sound during operation, the operation is immediately interrupted, the lid 12 is closed, and the operation is restarted after the temperature in the working space 5 becomes equal to or lower than a predetermined temperature. After the operation, the temperature recorded in the temperature recording unit is read, it is confirmed that the operation is performed at a predetermined temperature or lower, and the record is stored for management.

Industrial applicability

According to the present invention, it is possible to provide a table capable of performing work to be performed at a low temperature, for example, a temperature of-130 ℃ or lower, while moving a work place. For example, there is a work for treating frozen cells for medical use.

Description of the reference symbols

1 Mobile workbench

2 working table

3 base

4 working space forming member

4a flange

5 working space

6 refrigerant storage tank

7 casing

Step difference of 7a

7b bottom plate

7c foot

8 Heat insulation member

9 pipeline

10 liquid nitrogen

11 gap

12 cover body

12a handle

13 longitudinal bar

14 horizontal bar (handle)

15 moving component (Caster)

16 foot brake

17 temperature measuring part

18 temperature display part

19 warning generation unit.

Claims

1. A mobile work table, wherein,

a working space forming member for forming a working space for working at a low temperature, a refrigerant storage tank for storing a refrigerant, and a table having legs are mounted on a base provided with a moving member,

the feet are fixed at their lower ends to the upper surface of the base,

the moving member is provided on a lower surface of the base so that the stage can move in a state where the refrigerant storage groove is filled with the refrigerant.

2. The mobile work table of claim 1, further comprising: a temperature measuring part arranged in the working space so as to detect the temperature of the working space when working at low temperature; and a temperature display unit for displaying the temperature measured by the temperature measurement unit.

3. A mobile workstation as recited in claim 2, further comprising: a temperature recording unit having a function of recording the temperature measured by the temperature measuring unit.

4. A mobile workstation according to any one of claims 1 to 3, wherein the side and bottom walls of the cryogen vessel are insulated from the environment by insulating means.

5. A mobile workbench according to any of claims 1 to 3, wherein the cryogen received in the cryogen receiving vessel is liquid nitrogen.

6. A mobile work table according to any one of claims 1 to 3, further provided with: a cover for closing the freed upper surface of the workspace.

7. The mobile workbench according to any of claims 1 to 3, comprising a stopper capable of fixing the mobile member so as to prevent movement of the base.

8. The mobile workbench according to claim 7, further comprising a locking part interlocking with the stopper,

the locking portion enables the cover to be locked to the table in a state where the upper surface of the working space is closed by the cover when the fixing of the moving member by the stopper is released, and enables the locking to be released when the moving member is fixed by the stopper.

9. A mobile work platform according to any one of claims 1 to 3, further provided with a handle for a worker to hold onto.

10. The mobile workstation of claim 9 wherein the handle is provided on both front and rear sides of the mobile workstation.

11. The mobile table according to claim 2 or 3, further comprising a warning generation unit configured to generate a warning when the temperature measured by the temperature measurement unit is outside a predetermined temperature range.

12. A mobile work table according to any of claims 1 to 3 wherein the moving member is a castor wheel.

13. A mobile work table, wherein,

14. The mobile workbench according to any one of claims 1 to 3, further comprising a housing for housing the refrigerant housing tank, wherein the legs are provided at four corners of the housing, respectively.

15. A mobile workstation according to any of claims 1 to 3, wherein the workspace is a space filled with a gaseous phase at a lower temperature than the outside air for performing work in an environment at a lower temperature than the outside air.