A liquid nitrogen freezing safety protection device for replacing the tail brush of a slurry shield

Abstract

The present invention discloses a liquid nitrogen freezing safety protection device for replacing the tail brush of a muddy water shield, which relates to the technical field of shield machines, and particularly includes a shield machine shell, a shield brush and a pipe segment arranged from the outside to the inside, and also includes a freezing component, which includes a liquid storage tank, a plurality of liquid nitrogen circulation loops and a plurality of cooling plates cooled by the corresponding liquid nitrogen circulation loops, each of which is arranged on the shield machine shell, and a first bearing plate and a second bearing plate parallel to each other are arranged inside the liquid storage tank, the first bearing plate is arranged with a plurality of first limiting holes, the second bearing plate is arranged with a plurality of second limiting holes, the second bearing plate is fixed in the liquid storage tank, and the first bearing plate can be moved in the liquid storage tank through an adjustment component. The present invention changes the freezing effect of the freezing component on muddy water, and makes the freezing effect of muddy water controllable under high water pressure conditions, and can prevent muddy water from entering the inside of the shield machine when replacing the tail brush of the shield.

Description

Technical Field

[0001] The invention relates to the technical field of shield machines, and in particular to a liquid nitrogen freezing safety protection device for replacing a tail brush of a slurry shield. Background Art

[0002] The liquid nitrogen freezing safety protection device for replacing the tail brush of the slurry shield is a device for protecting the shield machine. By introducing liquid nitrogen or grease into the inside of the tail brush of the device, the slurry can be quickly frozen through the circulation of liquid nitrogen, or the slurry can be blocked to prevent the slurry from entering the inside of the shield machine under high water pressure conditions, thereby extending the service life of the shield machine.

[0003] At present, under the commonly used high water pressure conditions, replacing the liquid nitrogen freezing safety protection device of the tail brush of the slurry shield not only cannot change the speed of liquid nitrogen outflow, but also cannot adjust the flow rate of liquid nitrogen supply, thereby affecting the freezing effect of liquid nitrogen on slurry, and cannot prevent slurry from entering the shield machine under high water pressure conditions, thereby reducing the service life of the shield machine. Summary of the invention

[0004] The purpose of the present invention is to provide a liquid nitrogen freezing safety protection device for replacing the tail brush of a mud and water shield, which can change the outflow speed of liquid nitrogen, adjust the flow rate of liquid nitrogen supply, and thus affect the freezing effect of liquid nitrogen on mud and water, and can prevent mud and water from entering the interior of the shield machine under high water pressure conditions, thereby increasing the service life of the shield machine.

[0005] The technical solutions adopted to solve the above technical problems are:

[0006] A liquid nitrogen freezing safety protection device for replacing the tail brush of a slurry shield comprises a shield machine shell, a shield brush and a pipe segment arranged from the outside to the inside, and also comprises a freezing component, which comprises a liquid storage tank, a plurality of liquid nitrogen circulation loops and a plurality of cooling plates cooled by the corresponding liquid nitrogen circulation loops, each of the cooling plates being arranged on the shield machine shell, a first bearing plate and a second bearing plate parallel to each other being arranged inside the liquid storage tank, the first bearing plate being arranged with a plurality of first limiting holes, the second bearing plate being arranged with a plurality of second limiting holes, the second bearing plate being fixed in the liquid storage tank, and the first bearing plate being movable in the liquid storage tank through an adjusting component.

[0007] As a further improvement of the above technical solution, the adjustment assembly includes a connecting sleeve fixed to the inner wall of the liquid storage tank, a telescopic block partially inserted into the connecting sleeve and movable, and a pull rod fixedly connected to the telescopic block, the second bearing plate is fixedly connected to the connecting sleeve, the first bearing plate is fixedly connected to the telescopic block, and the liquid storage tank is installed with a limit block for fixing the pull rod.

[0008] As a further improvement of the above technical solution, the liquid storage tank is in the shape of a box, the first bearing plate and the second bearing plate are both square plate structures, the thickness direction of the first bearing plate is defined as the y direction, the length direction of the first bearing plate is defined as the x direction, and the connecting sleeve is provided with a telescopic space for the telescopic block to move along the x direction and / or y direction.

[0009] As a further improvement of the above technical solution, the pull rod has an extending arm extending toward the limit block, the limit block is provided with a locking hole for the extending arm to be inserted, and the locking hole is provided with a tightening bolt for tightening the extending arm.

[0010] As a further improvement of the above technical solution, each of the first limiting holes is evenly distributed on the first supporting plate, and each of the second limiting holes is evenly distributed on the second supporting plate. After the first supporting plate and the second supporting plate are bonded together, each of the first limiting holes and each of the second limiting holes correspond one to one.

[0011] As a further improvement of the above technical solution, the diameter of the first limiting hole is smaller than the diameter of the second limiting hole.

[0012] As a further improvement of the above technical solution, a bottom plate for supporting the first bearing plate is provided in the liquid storage tank.

[0013] As a further improvement of the above technical solution, each of the liquid nitrogen circulation loops includes a liquid inlet pipe and a liquid outlet pipe, each of the liquid inlet pipe and each of the liquid outlet pipes are connected to the liquid storage tank, each of the cooling plates is connected to the corresponding liquid inlet pipe and liquid outlet pipe, and each of the liquid inlet pipes is arranged with a booster pump.

[0014] As a further improvement of the above technical solution, the cooling plates are arranged on the inner circumference and the outer circumference of the shield machine shell, and the shield machine shell is provided with card slots for the corresponding cooling plates to be embedded.

[0015] As a further improvement of the above technical solution, the shield machine housing is equipped with fixing rods for fixing the pipe segments.

[0016] The beneficial effects of the present invention are as follows: the present invention designs a liquid storage tank, in which a first bearing plate and a second bearing plate parallel to each other are arranged, and the liquid nitrogen passes through the first bearing plate and the second bearing plate to cool the cooling plate, and the first bearing plate is arranged with a plurality of first limiting holes, and the second bearing plate is arranged with a plurality of second limiting holes. The present invention can change the flow rate of the liquid nitrogen by moving the first bearing plate, thereby changing the cooling temperature of the liquid nitrogen on the cooling plate, changing the freezing effect of the freezing component on the muddy water, and making the freezing effect of the muddy water controllable under high water pressure conditions. When replacing the shield tail brush, muddy water can be prevented from entering the interior of the shield machine, thereby increasing the service life of the shield machine. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly describes the drawings required for use in the description of the embodiments. Obviously, the drawings described are only part of the embodiments of the present invention, not all of the embodiments, and those skilled in the art can also obtain other design solutions and drawings based on these drawings without creative work.

[0018] Figure 1 is a cross-sectional view of an embodiment of the present invention;

[0019] Figure 2 yes Figure 1 A partial enlarged view of circle A in the middle;

[0020] Figure 3 yes Figure 1 A partial enlarged view of circle B in the middle;

[0021] Figure 4 is a schematic diagram of a first carrier plate;

[0022] Figure 5 is a schematic diagram of the second carrier plate. DETAILED DESCRIPTION

[0023] The following will clearly and completely describe the concept, specific structure and technical effects of the present invention in combination with the embodiments and drawings, so as to fully understand the purpose, characteristics and effects of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, other embodiments obtained by technicians in this field without creative work are all within the scope of protection of the present invention. In addition, all the connection / connection relationships mentioned in the text do not refer to the direct connection of components, but refer to the fact that a better connection structure can be formed by adding or reducing connection accessories according to the specific implementation situation.

[0024] Reference Figures 1 to 5 A liquid nitrogen freezing safety protection device for replacing the tail brush of a muddy shield includes a shield machine housing 2, a shield brush 3, and a pipe segment 1 arranged from the outside to the inside, and also includes a freezing component, which includes a liquid storage tank 8, a plurality of liquid nitrogen circulation loops, and a plurality of cooling plates 4 cooled by the corresponding liquid nitrogen circulation loops. Among them, each cooling plate 4 is arranged on the shield machine housing 2. Preferably, the inner and outer peripheral surfaces of the shield machine housing 2 are both arranged with cooling plates 4, and the shield machine housing 2 is provided with a card slot for the corresponding cooling plate 4 to be embedded. In this embodiment, Figure 1 As shown, there are eight annular cooling plates 4, four of which are arranged on the inner and outer peripheral surfaces of the shield machine shell 2. Further, as a preferred embodiment, there are three liquid nitrogen circulation loops, such as Figure 1As shown, each liquid nitrogen circulation loop includes a liquid inlet pipe 6 and a liquid outlet pipe 7, each liquid inlet pipe 6 and each liquid outlet pipe 7 are connected to a liquid storage tank 8, each cooling plate 4 is connected to the corresponding liquid inlet pipe 6 and liquid outlet pipe 7, and each liquid inlet pipe 6 is arranged with a booster pump 15. The booster pump 15 on each liquid inlet pipe 6 transports liquid nitrogen to the corresponding cooling plate 4. After each cooling plate 4 is cooled and reaches the set standard, the muddy water is frozen. After the muddy water is frozen, each shield tail brush 3 can be replaced. The specific replacement steps and methods are prior art and will not be repeated here. In addition, the shield machine housing 2 is equipped with a fixing rod 5 for fixing the pipe segment 1, which is convenient for the removal and installation of the shield tail brush 3.

[0025] A first supporting plate 10 and a second supporting plate 14 parallel to each other are arranged inside the liquid storage tank 8. The first supporting plate 10 is arranged with a plurality of first limiting holes 16, and the second supporting plate 14 is arranged with a plurality of second limiting holes 18. The second supporting plate 14 is fixed in the liquid storage tank 8, and the first supporting plate 10 can be moved in the liquid storage tank 8 through an adjusting component.

[0026] Specifically, as a preferred embodiment, the adjustment assembly includes a connecting sleeve 11 fixed to the inner wall of the liquid storage tank 8, a telescopic block 17 partially inserted into the connecting sleeve 11 and movable, and a pull rod 12 fixed to the telescopic block 17, the second bearing plate 14 is fixed to the connecting sleeve 11, the first bearing plate 10 is fixed to the telescopic block 17, and the liquid storage tank 8 is equipped with a limit block 13 for fixing the pull rod 12. Further, the liquid storage tank 8 is box-shaped, the first bearing plate 10 and the second bearing plate 14 are both square plate structures, the thickness direction of the first bearing plate 10 is defined as the y direction, the length direction of the first bearing plate 10 is defined as the x direction, and the connecting sleeve 11 is provided with a telescopic space for the telescopic block 17 to move along the x direction and / or the y direction. Further, each first limit hole 16 is evenly distributed on the first bearing plate 10, and each second limit hole 18 is evenly distributed on the second bearing plate 14. After the first bearing plate 10 and the second bearing plate 14 are attached, each first limit hole 16 corresponds to each second limit hole 18.

[0027] Reference Figure 1 , and combined with Figure 3In the liquid storage tank 8, the liquid nitrogen passes through the first carrier plate 10 and the second carrier plate 14 from bottom to top, and then is output by each liquid inlet pipe 6. In this embodiment, moving the first carrier plate 10 along the x direction is equivalent to the first carrier plate 10 moving up and down; moving the first carrier plate 10 along the y direction is equivalent to the first carrier plate 10 sliding left and right. When the adjustment component is used, the first carrier plate 10 can be moved toward the second carrier plate 14 by the pull rod 12, that is, moved along the y direction, so that the first carrier plate 10 and the second carrier plate 14 fit together. When the first carrier plate 10 and the second carrier plate 14 completely overlap, that is, each first limiting hole 16 and each second limiting hole 18 correspond one to one, the first limiting hole 16 and each second limiting hole 18 form a conducting hole. At this time, the caliber of the conducting hole is the largest, and the flow rate of the liquid nitrogen after passing through the conducting hole is the largest. In addition, the first carrier plate 10 can be slid left and right by the pull rod 12, that is, moved along the x direction. At this time, the diameter of the through hole gradually becomes smaller, and the flow rate of the liquid nitrogen after passing through the through hole gradually decreases. After the adjustment is completed, the first carrier plate 10 needs to be fixed. At this time, the pull rod 12 can be fixed by the limit block 13, so as to fix the first carrier plate 10. Specifically, the pull rod 12 has an extended arm extending to the limit block 13, and the limit block 13 is provided with a locking hole for inserting the extended arm. The locking hole is arranged with a tightening bolt for tightening the extended arm, that is, after the adjustment is completed, tighten the tightening bolt to lock the extended arm. In this embodiment, the diameter of the first limit hole 16 is smaller than the diameter of the second limit hole 18.

[0028] In addition, the operator can move the first carrier plate 10 away from the second carrier plate 14 and change the flow rate of the liquid nitrogen after passing through the through hole. To this end, a bottom plate 9 for supporting the first carrier plate 10 is provided in the liquid storage box 8 .

[0029] The present invention can change the diameter of the conducting hole by moving the first bearing plate 10 through the adjusting component, thereby changing the flow rate of the liquid nitrogen after passing through the conducting hole, adjusting the flow rate of the liquid nitrogen supply, and then changing the cooling temperature of the liquid nitrogen on the cooling plate, and changing the freezing effect of the freezing component on the muddy water. Under high water pressure conditions, the freezing effect of the muddy water can be controlled. When replacing the shield tail brush, muddy water can be prevented from entering the inside of the shield machine from the shield machine shell 2, thereby increasing the service life of the shield machine.

[0030] The embodiments of the present invention are described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge scope of ordinary technicians in the technical field without departing from the purpose of the present invention.

Claims

1. A liquid nitrogen freezing safety protection device for replacing a tail brush of a slurry shield, comprising a shield machine housing (2), a shield brush (3) and a segment (1) arranged from outside to inside, characterized in that: It also includes a freezing component, which includes a liquid storage tank (8), a plurality of liquid nitrogen circulation loops, and eight annular cooling plates (4) cooled by the corresponding liquid nitrogen circulation loops, each of the cooling plates (4) being arranged on the shield machine shell (2), wherein four cooling plates (4) are arranged on the inner circumference and the outer circumference of the shield machine shell (2), respectively; a first bearing plate (10) and a second bearing plate (14) parallel to each other are arranged inside the liquid storage tank (8), the first bearing plate (10) is arranged with a plurality of first limiting holes (16), the second bearing plate (14) is arranged with a plurality of second limiting holes (18), the second bearing plate (14) is fixed in the liquid storage tank (8), and the first bearing plate (10) can be moved in the liquid storage tank (8) through an adjustment component; The adjustment assembly comprises a connecting sleeve (11) fixed to the inner wall of the liquid storage tank (8), a telescopic block (17) partially inserted into the connecting sleeve (11) and movable, and a pull rod (12) fixedly connected to the telescopic block (17); the second bearing plate (14) is fixedly connected to the connecting sleeve (11); the first bearing plate (10) is fixedly connected to the telescopic block (17); and the liquid storage tank (8) is provided with a limit block (13) for fixing the pull rod (12); The liquid storage box (8) is box-shaped, the first bearing plate (10) and the second bearing plate (14) are both square plate structures, the thickness direction of the first bearing plate (10) is defined as the y direction, the length direction of the first bearing plate (10) is defined as the x direction, and a telescopic space is provided in the connecting sleeve (11) for the telescopic block (17) to move along the x direction and / or the y direction.

2. The liquid nitrogen freezing safety protection device for replacing the tail brush of a slurry shield according to claim 1 is characterized in that: The pull rod (12) has a protruding arm extending toward the limiting block (13); the limiting block (13) is provided with a locking hole for the protruding arm to be inserted; the locking hole is provided with a tightening bolt for tightening the protruding arm.

3. The liquid nitrogen freezing safety protection device for replacing the tail brush of a slurry shield according to any one of claims 1 to 2, characterized in that: The first limiting holes (16) are evenly distributed on the first supporting plate (10), and the second limiting holes (18) are evenly distributed on the second supporting plate (14); after the first supporting plate (10) and the second supporting plate (14) are bonded together, the first limiting holes (16) and the second limiting holes (18) correspond one to one.

4. The liquid nitrogen freezing safety protection device for replacing the tail brush of a slurry shield according to claim 3 is characterized in that: The diameter of the first limiting hole (16) is smaller than the diameter of the second limiting hole (18).

5. The liquid nitrogen freezing safety protection device for replacing the tail brush of a slurry shield according to claim 4 is characterized in that: A bottom plate (9) for supporting the first bearing plate (10) is provided in the liquid storage box (8).

6. The liquid nitrogen freezing safety protection device for replacing the tail brush of a slurry shield according to claim 1 is characterized in that: Each of the liquid nitrogen circulation loops comprises a liquid inlet pipe (6) and a liquid outlet pipe (7), each of the liquid inlet pipe (6) and each of the liquid outlet pipes (7) are connected to the liquid storage tank (8), each of the cooling plates (4) is connected to the corresponding liquid inlet pipe (6) and liquid outlet pipe (7), and each of the liquid inlet pipes (6) is provided with a booster pump (15).

7. The liquid nitrogen freezing safety protection device for replacing the tail brush of a slurry shield according to claim 6 is characterized in that: The cooling plates (4) are arranged on the inner circumference and the outer circumference of the shield machine casing (2), and the shield machine casing (2) is provided with card slots for the corresponding cooling plates (4) to be embedded.

8. The liquid nitrogen freezing safety protection device for replacing the tail brush of a slurry shield according to claim 1 is characterized in that: The shield machine casing (2) is provided with fixing rods (5) for fixing the segments (1).

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