CN114849811B

CN114849811B - Metal bath

Info

Publication number: CN114849811B
Application number: CN202210553034.8A
Authority: CN
Inventors: 薄旭峰; 李喜瑞; 苏志明; 耿进朝
Original assignee: Zhengzhou Keda Machinery Equipment Co ltd
Current assignee: Zhengzhou Keda Machinery Equipment Co ltd
Priority date: 2022-05-20
Filing date: 2022-05-20
Publication date: 2023-07-25
Anticipated expiration: 2042-05-20
Also published as: CN114849811A

Abstract

The invention relates to a metal bath, which is characterized in that a test tube hole in a heating block is arranged to be of a transparent structure on the basis of the prior art, an air outlet hole is arranged below the test tube hole, an air cylinder is arranged, a piston rod is used for driving a piston to move, a test tube is firmly adsorbed in the test tube hole through air pressure, wherein the piston rod is connected with a connecting rod, a ratchet bar is arranged on the connecting rod, the connecting rod cannot move upwards through the cooperation of the ratchet bar and a pawl, the connecting rod is locked at the current position, the ratchet bar and the pawl can be unlocked only by slightly pulling a pull rope during unlocking, and the vertical movement of the connecting rod can be unlocked, so that the test tube can be taken out from the test tube hole.

Description

Metal bath

Technical Field

The invention belongs to the technical field of biochemical reaction instruments, and particularly relates to a metal bath.

Background

The preservation and reaction of biochemical reagents usually need to meet certain temperature conditions, and a constant-temperature metal bath is an instrument for controlling the temperature of the preservation and reaction of biochemical reagents, and the instrument is widely applied to the protection of various biochemical samples, the preservation and reaction of various enzymes, the denaturation treatment of nucleic acid and protein, the PCR (polymerase chain reaction) reaction, the pre-denaturation of electrophoresis, the serum solidification and the like.

The existing constant temperature metal bath adopts heat conduction metal to replace the traditional water-oil bath pot, the dry constant temperature metal bath adopts microcomputer control, and high-purity aluminum material is used as heat conduction medium to replace the traditional water bath device, so that the device has the characteristics of exquisite appearance, convenient use, high precision, small volume and the like. The method can be widely applied to sample preservation and reaction, DNA amplification and electrophoresis pre-denaturation, serum solidification and the like, and the dry constant temperature metal bath can be provided with heating blocks with different holes according to the size of the test tube to heat the test tube at constant temperature. In order to make the temperature of the heat block uniform, a high-density aluminum alloy material is required to be adopted, so that excellent heat conductivity is ensured.

However, when the conventional constant-temperature metal bath is used for placing the test tube, the test tube is placed with a certain instability, the test tube can be moved randomly in the aperture of the heating block, a certain danger exists, and a certain potential safety hazard exists, so that improvement is expected on the basis of the prior art, and a metal bath is developed to solve the problems.

Disclosure of Invention

Aiming at the defects of the prior art, the invention aims to provide a metal bath for solving the problem that the prior metal bath mentioned in the background art cannot stably arrange a test tube arranged in a heating block.

The technical aim of the invention is realized by the following technical scheme:

the metal bath comprises a base, wherein a control panel is arranged on the base, the upper end of the base is connected with a metal heat conduction block, a heating system and a temperature control system are arranged in the base to realize heating and temperature monitoring treatment on the heat conduction block, and the metal bath is characterized in that the heat conduction block is in an annular shape, a plurality of groups of test tube holes uniformly distributed along the circumferential direction are vertically formed in the heat conduction block, the test tube holes are vertically transparent, an annular support plate and a connecting plate are sequentially arranged at the lower end of the heat conduction block, and test tube adsorption devices arranged on the support plate and the connecting plate are respectively arranged below each test tube hole;

the test tube adsorption device comprises an air outlet pipe which is vertically arranged on a supporting plate and is coaxially arranged at the lower end of a corresponding test tube hole and the test tube hole, a transition cap which is arranged in the test tube hole is vertically sleeved on the air outlet pipe, a first spring which is sleeved outside the air outlet pipe is connected between the lower end of the transition cap and the supporting plate, the air tightness of the air outlet pipe and the transition cap is good, the lower end of the air outlet pipe is communicated with an air cylinder which is arranged at the lower end of the supporting plate and is provided with an opening at the lower end, a piston rod is vertically matched and connected in the air cylinder, the upper end of the piston rod is connected with a piston which is in sliding fit with the inner side wall of the air cylinder, the lower end of the piston rod is connected with an L-shaped connecting rod, the connecting rod vertically slides through the supporting plate and the upper end of the connecting rod is arranged in the corresponding test tube hole, a limiting plate which is arranged between the test tube hole and the supporting plate is connected with the connecting rod, a second spring which is vertically arranged is connected between the limiting plate and the connecting plate, the upper end of the connecting rod is higher than the upper end of the transition cap when the first spring and the second spring are in a natural state, and the connecting rod is connected with a vertical displacement locking device which is arranged on the connecting plate, and the connecting rod is capable of vertically moving upwards and limiting the connecting rod and locking device which can vertically move upwards and can simultaneously and limiting the connecting rod;

the heating system, the temperature control system and the control panel are electrically connected with a controller arranged in the base;

the vertical displacement locking device comprises a ratchet bar which is vertically connected to the connecting rod and arranged between the supporting plate and the connecting plate, and further comprises a pawl which is rotationally connected to the upper end of the connecting plate, a third spring is connected between the pawl and the connecting plate, the pawl, the ratchet bar and the third spring are mutually matched to form a pawl structure, so that the downward movement of the connecting rod is limited, and the pawl is connected with an unlocking device, so that the matching of the pawl and the ratchet bar is unlocked;

the unlocking device comprises a pull rope which is connected to the pawl and penetrates through the third spring, the other end of the pull rope is arranged in the annular area of the heating block and is connected with a pull ring at the end part, the unlocking device further comprises a limiting block which is arranged on the inner wall of the annular area of the heating block, a vertically arranged penetrating hole is formed in the limiting block, and the pull ring penetrating through the penetrating hole and the end part is arranged above the limiting block.

Preferably, the supporting plate, the connecting plate and the limiting plate are all made of high-temperature-resistant plastics with high-temperature resistance.

Preferably, the heat conducting block is made of aluminum materials with good heat conducting performance.

Preferably, the diameters of the multiple groups of test tube holes are different.

Preferably, the upper end of the transition cap is connected with annular buffer rubber.

Preferably, the upper end surface of the limiting plate is contacted and matched with the lower end surface of the heating block under the action of the second spring.

Preferably, the limiting block is made of high-temperature-resistant ceramic, and the pull rope is made of high-temperature-resistant nylon.

Preferably, a plurality of groups of supporting feet are arranged at the lower end of the base.

The invention has the beneficial effects that: according to the invention, the test tube hole in the heating block is set to be in a through structure on the basis of the prior art, the air outlet hole is arranged below the test tube hole, the air cylinder is arranged, the piston rod is used for driving the piston to move, the test tube is firmly adsorbed in the test tube hole through air pressure, the piston rod is connected with the connecting rod, the ratchet bar is arranged on the connecting rod, the connecting rod can not move upwards through the cooperation of the ratchet bar and the pawl, the connecting rod is locked at the current position, the ratchet bar and the pawl can be unlocked only by slightly pulling the pull rope during unlocking, the test tube can be taken out from the test tube hole after the vertical movement of the connecting rod is unlocked, the test tube is firmly locked in the test tube hole by utilizing the action of the piston in the air cylinder, the reliable arrangement is realized, meanwhile, additional redundant operation is not needed, the test tube is only required to be slowly moved downwards until the test tube is moved to the limit position, random shaking and movement in the heating process are avoided, the operation is very simple, the structure is exquisite, and the occurrence of potential safety hazard is avoided.

Drawings

Fig. 1 is a perspective view of the present invention.

Fig. 2 is a front view of the present invention.

Fig. 3 is a top view of the present invention.

Fig. 4 is a perspective view of the present invention with a portion of the structure removed.

Fig. 5 is a perspective view of the invention with the base removed.

Fig. 6 is a front view of the invention with the base removed.

Fig. 7 is a cross-sectional view of the invention with the base removed.

Fig. 8 is a perspective view of a perspective structure of a support plate and a connection portion thereof according to the present invention.

Fig. 9 is a perspective view of a second perspective structure of the support plate and its connection part according to the present invention.

FIG. 10 is a perspective view of the cartridge and its attachment portion according to the present invention.

Fig. 11 is a perspective view of a transition cap and its connection portion in accordance with the present invention.

In the figure, 1, a base; 2. a control panel; 3. a heat conduction block; 4. a test tube hole; 5. a support plate; 6. a connecting plate; 7. an air outlet pipe; 8. a transition cap; 9. a first spring; 10. an air cylinder; 11. a piston rod; 12. a piston; 13. a connecting rod; 14. a limiting plate; 15. a second spring; 16. a ratchet bar; 17. a pawl; 18. a third spring; 19. a pull rope; 20. a pull ring; 21. a limiting hole; 22. a through hole; 23. a buffer spring; 24. and supporting the feet.

Description of the embodiments

The following describes embodiments of the present invention in further detail with reference to FIGS. 1-11.

In the first embodiment, the metal bath comprises a base 1, wherein a control panel 2 is arranged on the base 1, the temperature of the metal bath can be set on the control panel 2, so that a user can adjust the designated temperature, and meanwhile, the real-time temperature in a metal bath pot is monitored,

the upper end of the base 1 is connected with a metal heat conduction block 3, the metal heat conduction block 3 is made of aluminum metal, a heating system and a temperature control system are arranged in the base 1 to heat and monitor the temperature of the heat conduction block 3, the heating system and the temperature control system are made of the prior art, the heat conduction block 3 is not repeated, the heat conduction block 3 is annularly arranged, the heat conduction block 3 is wrapped outside the base 1 through an annular connecting cylinder, a heating device is adopted at the connection to heat the annular heating block, the heat conduction block 3 is uniformly heated, so that the designated temperature is reached, a plurality of groups of test tube holes 4 uniformly distributed along the circumferential direction are vertically formed in the heat conduction block 3, the test tube holes 4 are vertically through, the diameters of the test tube holes 4 can be the same as each other in one heating block, and also can be different from each other in diameter, for adapting to test tubes with different diameters, the lower end of the heat conduction block 3 is sequentially provided with an annular supporting plate 5 and a connecting plate 6, the annular shape of the annular supporting plate 5 and the annular shape of the connecting plate 6 are matched with the annular structure of the heat conduction block 3, the heat conduction block 3 is uniformly heated by adopting a heating device to heat conduction block 5, and the heat conduction block 6 is arranged in the heat conduction block 5 and is arranged in the test tube holes 4, and the heat absorption device is used for the test tube 4 to be stably arranged in the test tube;

the test tube adsorption device comprises an air outlet pipe 7 vertically arranged on a supporting plate 5 and arranged on the lower end of a corresponding test tube hole 4 and the test tube hole 4 coaxially, a transition cap 8 arranged in the test tube hole 4 is vertically sleeved on the air outlet pipe 7, the upper end surface of the transition cap 8 is higher than the lower end surface of a heating block, a first spring 9 sleeved outside the air outlet pipe 7 is connected between the lower end of the transition cap 8 and the supporting plate 5, the transition cap 8, the air outlet pipe 7 and the first spring 9 form a telescopic structure, the upper end of the transition cap 8 is also provided with an air outlet communicated with the air outlet pipe 7, the upper end of the transition cap 8 is connected with annular buffer rubber which plays a role of buffer protection, the air tightness of the air outlet pipe 7 and the transition cap 8 is good, and the air flowing out from the air outlet pipe 7 is prevented from flowing out smoothly from the outlet position of the transition cap 8, the air tightness between the air outlet pipe 7 and the transition cap 8 is ensured by rubber contact, the air tightness is ensured at the contact position due to the interaction between rubber, the lower end of the air outlet pipe 7 is communicated with an air cylinder 10 which is arranged at the lower end of the supporting plate 5 and is provided with an opening at the lower end, a piston 12 rod 11 is vertically matched and connected in the air cylinder 10, the upper end of the piston 12 rod 11 is connected with a piston 12 which is in sliding fit with the inner side wall of the air cylinder 10, the piston 12 and the piston 12 rod 11 and the air cylinder 10 are matched with each other in a similar principle to an injector, the piston 12 adopts rubber body, the air tightness between rubber and the inner wall of the air cylinder 10 is very good, the lower end of the piston 12 rod 11 is connected with an L-shaped connecting rod 13, the connecting rod 13 vertically slides through the supporting plate 5, the upper end of the connecting rod 13 is arranged in a corresponding test tube hole 4, the connecting rod 13 adopts a rectangular rod body structure, in order to prevent the connecting rod 13 from rotating in the process of vertically moving along the supporting plate 5, the connecting rod 13 is connected with a limiting plate 14 arranged between the test tube hole 4 and the supporting plate 5, a second spring 15 vertically arranged is connected between the limiting plate 14 and the supporting plate 5, the second spring 15 plays a role in reversely driving the limiting plate 14 and the connecting rod 13 in a reverse direction, the upper end surface of the limiting plate 14 is in contact fit with the lower end surface of the heating block under the action of the second spring 15, the upper end of the connecting rod 13 is higher than the upper end of the transition cap 8 when the first spring 9 and the second spring 15 are in a natural state, that is, a test tube firstly contacts the connecting rod 13 after entering the test tube hole 4, the end part of the connecting rod 13 is provided with a round corner structure to prevent the test tube from being damaged, the supporting plate 5, the connecting plate 6 and the limiting plate 14 are all made of high-temperature resistant plastics with high-temperature resistance, damage to the whole device caused by overhigh temperature is prevented, the connecting rod 13 is connected with a vertical displacement locking device arranged on the connecting plate 6, the vertical upward movement of the connecting rod 13 is limited by the vertical displacement locking device, and meanwhile, the vertical upward movement can be unlocked, that is, the vertical displacement locking device is used for locking the position of the connecting rod 13 after downward movement, so that the connecting rod 13 cannot move upwards under the action of the reverse pushing force of the second spring 15 and is locked at the current position, and meanwhile, the vertical upward movement of the connecting rod 13 can be unlocked by the vertical displacement locking device, and the vertical displacement locking device is flexibly changed according to the requirements of a user;

the heating system, the temperature control system and the control panel 2 are all electrically connected with the controller arranged in the base 1, the controller is made of an intelligent integrated circuit, the intelligent integrated circuit is internally provided with an intelligent chip, the intelligent circuit system is the prior art, and is not the key point of the technical problem, and the intelligent integrated circuit is not described in detail herein, when the embodiment is used, the temperature required by the test tube reaction is set by opening the switch of the metal bath, the corresponding test tube number can be selected to heat the specific temperature at the specific position if necessary, then after the specific temperature is reached, the test tube is placed in the test tube hole 4 with the matched diameter, the bottom of the test tube is firstly contacted with the upper end of the connecting rod 13 in the downward movement process of the test tube, the connecting rod 13 compresses the second spring 15 along with the downward movement of the test tube, the connecting rod 13 is driven to move downward, the connecting rod 13 drives the piston 12 rod 11 and the piston 12 to move downwards, so that the air cylinder 10 is inflated, after the bottom of a test tube contacts the top of the transition cap 8, the end part of the air outlet hole is blocked, along with the buffering action of the buffering spring 23, and in the downward moving process of the piston 12 rod 11, the volume of air in the air cylinder 10 is enlarged and the pressure is reduced after the air is blocked, thereby smoothly pressing the test tube on the buffering rubber on the transition cap 8, the aim of reliably placing the test tube is fulfilled, when the connecting rod 13 cannot be pressed downwards continuously, the vertical displacement locking device locks the connecting rod 13 under the action of the reverse force of the second spring 15, the connecting rod 13 is limited to move upwards, the reliable locking effect is achieved, when the substance in the test tube is heated to the designated temperature by the heating block, and the temperature is firstly lowered by the temperature control device, then through the upward locking of vertical position locking device with connecting rod 13 unblock, connecting rod 13 upwards moves under the effect of second spring 15, piston 12 pole 11 promotes piston 12 upwards and moves, the adsorption effect of the test tube with venthole top unblock, the test tube can be taken out in test tube hole 4 easily after the cooling, this embodiment utilizes the effect that piston 12 moved in the inflator 10, utilize atmospheric pressure to firmly lock the test tube in test tube hole 4, play the effect of reliable settling, do not need carrying out extra unnecessary operation simultaneously, only need downwardly and slowly move the test tube, until remove to extreme position can reach reliable locking's purpose, avoid rocking at will in the heating process and remove, the operation is very simple, the structure is exquisite, avoid the emergence of potential safety hazard.

In the second embodiment, on the basis of the first embodiment, a vertical displacement locking device is disclosed in the first embodiment, the vertical displacement locking device comprises a ratchet bar 16 vertically connected to a connecting rod 13 and arranged between a supporting plate 5 and a connecting plate 6, and further comprises a pawl 17 rotatably connected to the upper end of the connecting plate 6, a third spring 18 is connected between the pawl 17 and the connecting plate 6, the pawl 17, the ratchet bar 16 and the third spring 18 are mutually matched to form a pawl 17 structure, so that the downward movement of the connecting rod 13 is limited, and the pawl 17 and the ratchet bar 16 are matched to enable the connecting rod 13 to smoothly move downward but not move upward;

the unlocking device is connected to the pawl 17 and is used for unlocking the cooperation of the pawl 17 and the ratchet bar 16, if the connecting rod 13 is required to move upwards, the connecting rod 13 can move upwards freely under the action of the second spring 15 only when the cooperation between the pawl 17 and the ratchet bar 16 is required to be invalid, the unlocking device comprises a pull rope 19 which is connected to the pawl 17 and passes through the third spring 18, the other end of the pull rope 19 is arranged in an annular area of the heating block and is connected with a pull ring 20 at the end part, the unlocking device further comprises a limiting block which is arranged on the inner wall of the annular area of the heating block, the limiting block is made of high-temperature resistant ceramics, the pull rope 19 is made of high-temperature resistant nylon, a vertically arranged through hole 22 is formed in the limiting block, the pull rope 19 passes through the through hole 22 and the pull ring 20 at the end part is arranged above the limiting block, the pawl 17 can be matched and invalid only by pulling the pull ring 20, the position of the pull ring 20 is required to pass through the pull rod 17, the effect of the pawl 17 and the ratchet bar 16 can be achieved, the effect of the ratchet bar 16 is achieved, the effect of pulling is achieved when the pawl 17 is not matched with the pawl 16, and the pawl 13 is required to move upwards, and the position of the connecting rod 13 is required to be matched with the pawl 16 smoothly once the pawl 13 is pulled.

When the invention is used, the temperature required by the reaction of the test tube is set by opening the switch of the metal bath, the corresponding test tube number can be selected to heat the specific temperature at the specific position if necessary, then the test tube is put into the test tube hole 4 with the matched diameter after the specific temperature is reached, the bottom of the test tube firstly contacts the upper end of the connecting rod 13 in the downward moving process of the test tube, the connecting rod 13 compresses the second spring 15 to shrink along with the downward moving of the test tube, the connecting rod 13 is driven to move downwards, the piston 12 rod 11 is driven by the connecting rod 13 to move downwards along with the piston 12, so that the air cylinder 10 is inflated, the end part of the air outlet hole is blocked after the bottom of the test tube contacts the top of the transition cap 8, the air in the air cylinder 10 is blocked along with the buffer action of the buffer spring 23 and the downward moving process of the piston 12 rod 11, the volume becomes larger, the pressure becomes smaller, thereby smoothly pressing the test tube on the buffer rubber on the transition cap 8, the purpose of reliably arranging the test tube is achieved, when the connecting rod 13 cannot be continuously pressed downwards, the pawl 17 can not move upwards due to the cooperation with the ratchet bar 16, the connecting rod 13 is limited to move upwards, the reliable locking effect is achieved, when the substance in the test tube is heated to the designated temperature by the heating block, the temperature is firstly reduced by the temperature control device, then the pull rope 19 is pulled by the pull ring 20, the pawl 17 is pulled out of the cooperation position on the ratchet bar 16, the connecting rod 13 can smoothly move upwards at the moment, the connecting rod 13 moves upwards under the action of the second spring 15, the piston 12 rod 11 pushes the piston 12 to move upwards, the adsorption effect of the test tube above the air outlet hole is unlocked, the test tube can be easily taken out from the test tube hole 4 after being cooled, the invention uses the action of the movement of the piston 12 in the air cylinder 10, firmly locks the test tube in the test tube hole 4 by using the atmospheric pressure, plays a reliable placement role, does not need to carry out extra redundant operation, only needs to slowly move the test tube downwards until the test tube moves to the limit position, can achieve the aim of reliable locking, avoids random shaking and movement in the heating process, has very simple operation and exquisite structure, and avoids the occurrence of potential safety hazards.

The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, alternatives, and improvements that fall within the spirit and scope of the invention.

Claims

1. The metal bath comprises a base (1), wherein a control panel (2) is arranged on the base (1), a metal heat conduction block (3) is connected to the upper end of the base (1), a heating system and a temperature control system are arranged in the base (1), and heating and temperature monitoring treatment of the heat conduction block (3) are achieved, the metal bath is characterized in that the heat conduction block (3) is in an annular arrangement, a plurality of groups of test tube holes (4) uniformly distributed along the circumferential direction are vertically formed in the heat conduction block (3), the test tube holes (4) are vertically transparent, an annular supporting plate (5) and a connecting plate (6) are sequentially arranged at the lower end of the heat conduction block (3), and test tube adsorption devices arranged on the supporting plate (5) and the connecting plate (6) are respectively arranged below each test tube hole (4);

the test tube adsorption device comprises an air outlet pipe (7) vertically arranged on a supporting plate (5) and coaxially arranged at the lower end of a corresponding test tube hole (4) and the test tube hole (4), a transition cap (8) arranged in the test tube hole (4) is vertically sleeved on the air outlet pipe (7), a first spring (9) sleeved outside the air outlet pipe (7) is connected between the lower end of the transition cap (8) and the supporting plate (5), the air outlet pipe (7) and the transition cap (8) are good in air tightness, the lower end of the air outlet pipe (7) is communicated with an air cylinder (10) which is arranged at the lower end of the supporting plate (5) and is provided with an opening at the lower end, a piston (12) rod (11) is vertically matched and connected with the upper end of the piston (12) rod (11), the lower end of the piston (12) rod (11) is connected with an L-shaped connecting rod (13), the connecting rod (13) vertically slides through the supporting plate (5) and is arranged in the corresponding hole (4), the upper end of the connecting rod (13) is connected with a connecting rod (14) between the supporting plate (5) and a limiting plate (14), the upper end of the connecting rod (13) is higher than the upper end of the transition cap (8) when the first spring (9) and the second spring (15) are in a natural state, the connecting rod (13) is connected with a vertical displacement locking device arranged on the connecting plate (6), and the vertical displacement locking device is used for limiting the vertical upward movement of the connecting rod (13) and unlocking the vertical upward movement;

the heating system, the temperature control system and the control panel (2) are electrically connected with a controller arranged in the base (1);

the vertical displacement locking device comprises a ratchet bar (16) vertically connected to the connecting rod (13) and arranged between the supporting plate (5) and the connecting plate (6), and further comprises a pawl (17) rotationally connected to the upper end of the connecting plate (6), a third spring (18) is connected between the pawl (17) and the connecting plate (6), the pawl (17), the ratchet bar (16) and the third spring (18) are mutually matched to form a pawl (17) structure, the downward movement of the connecting rod (13) is limited, and an unlocking device is connected to the pawl (17) to unlock the cooperation of the pawl (17) and the ratchet bar (16);

the unlocking device comprises a pull rope (19) which is connected to the pawl (17) and penetrates through the third spring (18), the other end of the pull rope (19) is arranged in the annular area of the heating block, a pull ring (20) is connected to the end portion of the pull rope, the unlocking device further comprises a limiting block which is arranged on the inner wall of the annular area of the heating block, a vertically arranged penetrating hole (22) is formed in the limiting block, and the pull ring (20) penetrating through the penetrating hole (22) and the end portion of the pull rope (19) is arranged above the limiting block.

2. The metal bath according to claim 1, characterized in that the support plate (5), the connection plate (6) and the limiting plate (14) are all made of a high temperature resistant plastic with high temperature resistance.

3. The metal bath according to claim 1, characterized in that the heat conducting block (3) is made of aluminium material with good heat conducting properties.

4. The metal bath according to claim 1, characterized in that the diameter of the plurality of groups of test tube holes (4) varies.

5. The metal bath according to claim 1, characterized in that the upper end of the transition cap (8) is connected with annular buffer rubber.

6. The metal bath according to claim 1, characterized in that the upper end surface of the limiting plate (14) is in contact fit with the lower end surface of the heating block under the action of the second spring (15).

7. The metal bath according to claim 1, characterized in that the limiting block is made of high temperature resistant ceramic, and the pull rope (19) is made of high temperature resistant nylon.

8. The metal bath according to claim 1, characterized in that the lower end of the base (1) is provided with a plurality of sets of support feet (24).