CN113294949A - LNG direct-cooling type ice maker and ice making method thereof - Google Patents

Abstract

The invention discloses an LNG direct-cooling type ice maker, which comprises a main bracket, an LNG ice making system, an ice melting system and a control system. The LNG ice making system comprises an LNG circulating refrigeration pipeline, an ice mold and a lifting platform, wherein the ice mold is fixedly arranged at the upper half part of the ice making area of the main support, and the lifting platform is arranged below the ice mold; the LNG circulating refrigeration pipeline comprises an input pipe, an output pipe, an upper flow converging pipe, a lower flow dividing pipe and a plurality of liquid cooling pipes, wherein the plurality of liquid cooling pipes are arranged in through holes of the vertical partition plate. The deicing system comprises a heat medium energy storage tank, a heat medium circulating pump, a heat medium circulating pipeline and a heating device, wherein the heat medium circulating pipeline comprises a conveying pipe, a flow dividing pipe, a plurality of radiating pipes, a flow combining pipe and a recovery pipe, and the plurality of radiating pipes are also arranged in the through holes of the vertical partition plate. The control system is used for controlling the operation of the whole device. The invention fully utilizes the cold energy generated in the LNG gasification process to complete the production of ice blocks, and has simple and novel structure and high safety; the cold energy utilization efficiency is high, the ice making time is short, and the later maintenance is convenient.

Description

LNG direct-cooling type ice maker and ice making method thereof

Technical Field

The invention relates to the technical field of LNG application, in particular to an LNG direct-cooling type ice machine and an ice making method thereof.

Background

LNG (liquefied Natural gas), an acronym for liquefied Natural gas, is becoming increasingly popular as a clean energy source, LNG is being listed as the preferred fuel in many countries, and the proportion of Natural gas in the energy supply is rapidly increasing. And the energy is used as the material basis of human survival and social development, the utilization efficiency of the energy is generally low at the present stage, most useful energy is directly discharged as waste, and reasonable and effective utilization is not achieved. For example, as the demand for natural gas consumption increases, a large amount of cold energy is released during LNG vaporization during use, and since the LNG receiving station is mostly built on the coast, the cold energy released during LNG vaporization is directly taken away by seawater or air, resulting in a useless loss of cold energy, which is not utilized.

Disclosure of Invention

The present invention is directed to solve the above-mentioned drawbacks of the prior art, and provides an LNG direct-cooling ice maker and an ice making method thereof.

In order to solve the technical problems, the invention adopts the technical scheme that: an LNG direct cooling type ice maker comprises a main support, an LNG ice making system, an ice melting system and a control system. The main bracket is divided into a control area and an ice making area; the LNG ice making system comprises an LNG circulating refrigeration pipeline, ice molds and a lifting platform, wherein the ice molds are fixedly arranged on the upper half part of an ice making area of a main bracket and are vertically staggered by a plurality of transverse clapboards and a plurality of vertical clapboards, the vertical clapboards are provided with upper and lower openings, the vertical clapboards are provided with a plurality of through holes penetrating through the length direction of the vertical clapboards, the lifting platform is arranged below the ice molds and comprises a double-head stepping motor, T-shaped gear direction changers, a screw rod lifter, a driving shaft, a transmission shaft and a flat plate base, the double-head stepping motor is fixedly arranged at the central position of the outer side of the left end of the ice molds, rotating shafts at the two ends of the double-head stepping motor are respectively and fixedly connected with a driving shaft through couplings, the other ends of the two driving shafts are respectively connected with a T-shaped gear commutator through the couplings, the two T-shaped gear direction changers are respectively and fixedly arranged on two vertical brackets at the left side of the main bracket, and the mounting height of the two T-head stepping motors is parallel and level with the double-head stepping motor, the output end of the T-shaped gear direction changer is sequentially connected with a plurality of lead screw lifters through a transmission shaft, the lead screw lifters are fixedly arranged on the outer side of a middle cross beam of a bracket at the lower end of the ice mold, are symmetrical front and back and are flush with the T-shaped gear direction changer; the front side and the rear side of the flat plate base are respectively provided with a protruding lug corresponding to the screw rod lifter, and the lower end of a screw rod in the screw rod lifter is fixedly connected with the protruding lugs to drive the flat plate base to move up and down; the LNG circulating refrigeration pipeline is divided into a conveying part and a refrigeration part, the conveying part comprises an input pipe, an output pipe, an upper flow combining pipe and a lower flow dividing pipe, the refrigeration part comprises a plurality of liquid cooling pipes in S-shaped loops, the liquid cooling pipes are installed in through holes of the vertical partition plate, two ends of each liquid cooling pipe are respectively communicated with the upper flow combining pipe and the lower flow dividing pipe, the input pipe is communicated with the lower flow dividing pipe, and the output pipe is communicated with the upper flow combining pipe.

The deicing system comprises a heat medium energy storage tank, a heat medium circulating pump, a heat medium circulating pipeline and a heating device, wherein the heat medium energy storage tank is fixedly installed on the rear side of a main support control area, a discharge port and a heat medium circulating pump are arranged on the lower portion of the heat medium energy storage tank, the heat medium circulating pump is communicated with the heat medium circulating pump, the heat medium circulating pump is communicated with the heat medium circulating pipeline, the heat medium circulating pipeline comprises a conveying pipe, a shunt pipe, a plurality of radiating pipes, a confluence pipe and a recovery pipe, the conveying pipe is communicated with the heat medium circulating pump and the shunt pipe, the plurality of radiating pipes are installed in through holes of a vertical partition plate respectively, the lower end of the heat medium circulating pump is communicated with the shunt pipe, the upper end of the heat medium circulating pump is communicated with the confluence pipe, the confluence pipe is communicated with the heat medium energy storage tank through the recovery pipe, and the heating device is fixedly installed on the heat medium energy storage tank.

The control system comprises a PLC explosion-proof control cabinet, a temperature sensor, a pressure sensor and a control valve, wherein the PLC explosion-proof control cabinet is fixedly arranged on the front side of the control area of the main bracket and is used for controlling the operation of the whole device; and the temperature sensor, the pressure sensor and the control valve are arranged on the LNG circulating refrigeration pipeline.

Further, the LNG direct cooling type ice maker also comprises an ice pushing device. The ice pushing device is fixedly arranged at the junction of the control area and the ice making area of the main support, is positioned in the control area, and comprises a control motor, a hydraulic telescopic cylinder and an ice pushing frame, the hydraulic telescopic cylinder is fixedly arranged on the main support, a telescopic rod of the hydraulic telescopic cylinder points to the ice making area, the tail end of the telescopic rod is fixedly connected with the ice pushing frame, the ice pushing frame and the telescopic rod are vertically arranged, the ice pushing frame is of a cuboid structure, and the length of the ice pushing frame is slightly smaller than the width of the main support; the control motor is arranged at the side of the hydraulic telescopic cylinder to provide power.

Furthermore, the flat plate base in the lifting platform is in a sealing state when being contacted with the lower end of the ice mold.

Furthermore, the through holes arranged on the vertical partition plates are of a double-hole specification, one through hole is provided with a liquid cooling pipe, the other through hole is provided with a radiating pipe, and the two pipelines are alternately arranged; a temperature sensor, a pressure sensor and a low-temperature pneumatic stop valve are mounted on an output pipe of the LNG circulating refrigeration pipeline, and the temperature sensor, the pressure sensor and the low-temperature pneumatic stop valve are all connected with the PLC explosion-proof control cabinet; and the delivery pipe and the recovery pipe in the heat medium circulation pipeline are both provided with check valves.

Furthermore, the outer side of the ice mold is wrapped with a polyurethane foaming heat-insulating material.

Further, the lower end of the ice pushing frame is higher than the upper surface of the flat base in a falling state; the upper parts of the two ends of the ice pushing frame are also provided with sliding wheels, the lower parts of the front side and the rear side of the main support are provided with railings, and the inner sides of the cross bars at the upper ends of the railings are provided with sliding rails matched with the sliding wheels.

Further, transmission shafts for linking two adjacent screw rod lifters are fixed through a bearing with a seat; two output synchronous operation of double-end step motor drive the equal synchronous operation of whole lead screw lift for dull and stereotyped base is the level form and reciprocates.

Further, the heating device adopts a solar heating system; or an electrical heating device.

Furthermore, explosion-proof safety valves are mounted on pipelines of the conveying parts in the LNG circulating refrigeration pipeline and the heating medium circulating pipeline.

An LNG direct cooling type ice making method adopts the LNG direct cooling type ice making machine and comprises the following steps:

the method comprises the following steps that firstly, a PLC explosion-proof control cabinet controls a lifting platform to operate, a flat plate base rises to be in sealing fit with the lower end of an ice mold, and water is injected from the upper end of the ice mold;

step two, introducing the LNG into an LNG circulating refrigeration pipeline in the ice maker under the pressure of the storage tank, introducing the LNG from the input pipe, distributing the LNG into the plurality of liquid cooling pipes through the lower flow dividing pipe, gasifying the LNG in the liquid cooling pipes, and completing cold exchange between the LNG and water through an ice mold to form ice blocks;

step three, closing LNG input, enabling a heating medium to enter the conveying pipe under the action of the heating medium circulating pump, enabling the heating medium to flow into the plurality of radiating pipes through the shunt pipes, and performing heat exchange with the surface of the ice block to melt the surface of the ice block, which is in contact with the ice mold;

step four, the PLC explosion-proof control cabinet controls the lifting platform to reversely operate, the flat base descends, and the ice blocks descend to the bottom along with the flat base under the action of self gravity; the ice pushing device operates to push out the ice blocks.

Compared with the prior art, the invention has the following beneficial effects: the LNG direct-cooling ice maker is in a sledge design, the whole machine is explosion-proof, cold energy generated in the gasification process when liquefied natural gas flows through a pipeline is utilized, and ice is replaced by water through the ice mold, so that ice blocks are manufactured, and the LNG direct-cooling ice maker is simple and novel in structure and high in safety; and does not need intermediate conversion medium, the cold energy utilization efficiency is high, the ice making time is short, the site operation or the pipeline reconstruction are simple and convenient, and the later maintenance is convenient. Meanwhile, all electric devices in the equipment adopt an explosion-proof design, and the whole machine can be directly placed in a gasification station area for use.

Drawings

FIG. 1 is a schematic representation of the northeast isometric configuration of the present invention;

FIG. 2 is a schematic view of the northwest isometric configuration of the present invention;

FIG. 3 is a top view of the present invention;

FIG. 4 is a front view of the present invention;

FIG. 5 is an enlarged view of A in FIG. 1;

FIG. 6 is an enlarged view of B in FIG. 2;

in the figure: 1. the system comprises a main support, 2, an ice mold, 6, a PLC explosion-proof control cabinet, 8 and a railing;

101. a bottom bracket, 102, a middle reinforcing rod, 103, a middle cross beam, 104, a vertical bracket, 201, a vertical clapboard, 202, a horizontal clapboard, 203, a through hole, 301, a flat base, 302, a double-head stepping motor, 303, a T-shaped gear commutator, 304, a screw rod lifter, 305, a driving shaft, 306, a driving shaft, 307, a bearing with a seat, 308, a protruding lug, 309, a coupler, 310, a screw rod, 311, a fixed seat, 312, a fixed platform, 401, an LNG inlet, 402, an LNG gasification outlet, 403, a liquid cooling pipe, 404, a lower shunt pipe, 405, an upper flow-joining pipe, 406, an output pipe, 407, an input pipe, 408, a pressure sensor, 409, a low-temperature pneumatic stop valve, 410, an explosion-proof safety valve, 501, a heat medium energy storage tank, 502, a heat medium circulating pump, 503, a shunt pipe, 504, a flow-joining pipe, 505, a recovery pipe, 506, a delivery pipe, 507, a heat dissipation pipe, 508 and a solar panel, 509. a heat medium replacing port 701, a control motor 702, a hydraulic telescopic cylinder 703, an ice pushing frame 704, a pulley 705 and a slide rail.

Detailed Description

It should be noted that, in the present invention, the terms such as "upper", "lower", "left", "right", "front", "back", and the like indicate the orientation or the positional relationship based on the drawings, and the terms are only the terms determined for convenience of describing the structural relationship of the components of the present invention, and do not refer to any components of the present invention, and are not to be construed as limiting the present invention.

The following detailed description of embodiments of the invention is provided in conjunction with the appended drawings:

referring to fig. 1 to 4, an LNG direct cooling type ice maker includes a main frame 1, an LNG ice making system, an ice melting system, and an intelligent control system. The main support 1 is of a cuboid frame structure, the bottom of the main support is formed by welding I-shaped metal plates and is used for elevating the whole device, erosion of ground water vapor to equipment is avoided, and reinforcing rib plates are arranged on the side edges of the I-shaped metal plates, so that the stability of the whole device is improved; the upper frame of main support 1 is formed by many square pipe welding, and other devices of the fixed mounting of being convenient for divide into control area and two regions in ice making district with main support 1 simultaneously, and the left side position of main support 1 is the ice making district, and its right side position is the control area, arranges the installation multiple pipeline in the control area equally.

The LNG ice making system comprises an LNG circulating refrigeration pipeline, an ice mold 2 and a lifting platform; the ice mold 2 is fixedly arranged at the upper half part of the ice making area of the main bracket 1 and is made by mutually vertically and alternately arranging a plurality of transverse clapboards 202 and a plurality of vertical clapboards 201, an ice cavity is formed in the ice mold, the ice cavity is opened up and down and can be set to different specifications according to the ice making requirement, and the lower end of the ice mold 2 is flush with the middle cross beam 103 of the main bracket 1; be equipped with a plurality of through-holes 203 that run through vertical baffle 201 length direction on vertical baffle 201, and through-hole 203 establishes to the diplopore specification, and the equidistance interval is arranged. The lifting platform is arranged below the ice mold 2 and comprises a double-head stepping motor 302, a T-shaped gear direction changer 303, a screw rod lifter 304, a driving shaft 305, a transmission shaft 306 and a flat plate base 301, the double-head stepping motor 302 is fixedly arranged on a middle cross beam of the main support 1 at the left end of the ice mold 2 and is positioned in the middle position of the left end of the ice mold 2, two output rotating shaft ends of the double-head stepping motor 302 are fixedly connected with one driving shaft 305 through a coupler 309 respectively, and the other end of the driving shaft 305 is linked with the T-shaped gear direction changer 303; the T-shaped gear commutator 303 positioned at the front half part of the ice mold 2 is arranged on the vertical support 104 at the left front side of the main support 1 through a fixed platform 312, the fixed platform 312 is horizontally arranged at the outer right angle of the vertical support 104, the T-shaped gear commutator 303 is fixedly arranged on the upper side surface of the fixed platform 312 through bolts, the installation height of the T-shaped gear commutator 303 is flush with that of the double-head stepping motor 302, the output end of the T-shaped gear commutator 303 is connected with a transmission shaft 306 through a coupler, the tail end of the transmission shaft 306 is connected with a lead screw lifter 304, the lead screw lifter 304 is sequentially linked with two lead screw lifters 304 through the transmission shaft 306, three lead screw lifters 304 are respectively and fixedly arranged on the middle cross beam 103 at the front side of the ice making area of the main support 1 through horizontal T-shaped bases, the installation height of the lead screw lifters is consistent with that of the T-shaped gear commutator 303, a bearing 307 with a base is sleeved on the transmission shaft 306 between two adjacent lead screw lifters 304, the transmission shaft 306 is used for stabilizing, preventing vibration and ensuring horizontal transmission; the lifting device at the back half part of the ice mould 2 is arranged the same as the front half part, and is symmetrical with the transverse center line. The flat plate base 301 is positioned under the ice mold 2, the area of the flat plate base is the same as that of the lower end of the ice mold 2, and the positions, which are in contact with the lower end of the ice mold 2, on the periphery of the flat plate base are sealed, so that water injection leakage in the ice making process is prevented; three protruding lugs 308 are respectively arranged on the front side and the rear side of the flat plate base 301 and respectively correspond to the screw rod lifter 304, and the lower end of a screw rod 310 in the screw rod lifter 304 is respectively fixedly connected to the corresponding protruding lugs 308 through a fixing seat 311, so that the flat plate base 301 can be driven to move up and down in a horizontal state. The LNG circulating refrigeration pipeline can be divided into a conveying part and a refrigeration part, the conveying part is arranged in a control area of the main support 1 and comprises an input pipe 407, an output pipe 406, a lower shunt pipe 404 and an upper confluence pipe 405, and the refrigeration part is arranged in the vertical partition plate 201 of the ice mold 2 and comprises a plurality of liquid cooling pipes 403 in S-shaped loops; an LNG inlet 401 is arranged at one end of an input pipe 407, the other end of the input pipe is communicated with a lower shunt pipe 404, the lower shunt pipe 404 is communicated with the lower ends of a plurality of liquid cooling pipes 403, the liquid cooling pipes 403 penetrate through upper through holes 203 of the vertical partition 201, the upper ends of the liquid cooling pipes are communicated with an upper confluence pipe 405, the upper confluence pipe 405 is communicated with an output pipe 406, and an LNG gasification outlet 402 is arranged at the tail end of the output pipe 406; a low-temperature pneumatic stop valve 409 and an explosion-proof safety valve 410 are respectively arranged on the input pipe 407 and the output pipe 406, and a pressure gauge, a temperature sensor and a pressure sensor 408 are additionally arranged on the pipeline of the output pipe 406 to monitor the LNG circulating refrigeration pipeline in real time.

The deicing system comprises a heat medium energy storage tank 501, a heat medium circulating pump 502, a heat medium circulating pipeline and a heating device, wherein the heat medium energy storage tank 501 is fixedly arranged at the rear side position of a control area of the main support 1, and the bottom of the outer side wall of the heat medium energy storage tank is provided with a heat medium replacing port 509 for replacing an internal heat medium at any time; a heating medium outlet is arranged at one side of the interior and is communicated with a heating medium circulating pump 502 through a pipeline; the heat medium circulation pipeline comprises a delivery pipe 506, a shunt pipe 503, a plurality of radiating pipes 507, a flow combining pipe 504 and a recovery pipe 505, one end of the delivery pipe 506 is connected with an outlet of the heat medium circulation pump 502, the other end of the delivery pipe is communicated with the shunt pipe 503, the shunt pipe 503 is communicated with the lower ends of the plurality of radiating pipes 507, the radiating pipes 507 penetrate through holes 203 formed in the vertical partition plate 201, the upper ends of the radiating pipes 507 are connected to the flow combining pipe 504, the flow combining pipe 504 is communicated with one end of the recovery pipe 505, and the other end of the recovery pipe 505 is connected to the heat medium energy storage tank 501 to complete circulation. One-way check valves are respectively installed on the delivery pipe 506 and the recovery pipe 505 to ensure the circulation safety of the heating medium. The heating device selects the solar light panel 508, is fixedly installed on the upper side of the heat medium energy storage tank 501, provides heat energy for a heat medium in real time, and is provided with the electric heater in an auxiliary mode, so that the ice melting process is not affected by external conditions such as weather.

Further, referring to fig. 6, the liquid cooling pipe 403 and the heat dissipation pipe 507 in the liquid cooling pipeline and the heat medium circulation pipeline in the LNG circulation refrigeration pipeline are both installed in the through hole 203 formed in the vertical partition 201, the through hole 203 is provided with two holes, the heat dissipation pipe 507 is installed in the lower hole of the same through hole 203, the liquid cooling pipe 403 is installed in the upper hole, and the two pipelines are alternately installed back and forth without being communicated or directly contacted, so that uniform supply of temperature is ensured.

The intelligent control system comprises a PLC explosion-proof control cabinet 6, the PLC explosion-proof control cabinet 6 is fixedly arranged on a front side beam of a control area of the main bracket 1, and a PLC control system is arranged in the PLC explosion-proof control cabinet and used for controlling the operation of the whole device; above-mentioned pneumatic stop valve of low temperature 409, temperature sensor, pressure sensor 408 and lift platform all connect PLC explosion-proof switch board 6, and at whole ice-making in-process, all sensors real-time supervision and with data transmission to PLC control system, PLC control system handles received signal, accomplishes intelligent control.

The LNG direct-cooling ice maker further comprises an ice pushing device, and with reference to fig. 3 and 5, the ice pushing device is fixedly installed at the junction of a control area and an ice making area of the main support 1, is located at the lower half position in the control area, and comprises a control motor 701, a hydraulic telescopic cylinder 702 and an ice pushing frame 703, the tail end of the hydraulic telescopic cylinder 702 is fixed on a vertical support rod on the right side of the main support 1 through a hinged base, a telescopic rod of the hydraulic telescopic cylinder is directed to the ice making area, the control motor 701 is located beside the hydraulic telescopic cylinder 702, and is fixedly installed on a base cross beam of the main support 1 to provide power for the hydraulic telescopic cylinder 702; the tail end of the telescopic rod is fixedly connected with the central position of the ice pushing frame 703 and is integrally vertical to the ice pushing frame 703. The ice pushing frame 703 is of a cuboid frame structure, and one side facing the ice making area of the main bracket 1 is flush; the length of the ice pushing frame 703 is smaller than the width of the total support 1, and the installation height of the lower end face of the ice pushing frame is higher than the upper surface of the flat base 301 in a falling state, so that mutual blocking is avoided; pulleys 704 are further arranged on the upper cross bars at the front end and the rear end of the ice pushing frame 703 and used for assisting the ice pushing frame 703 to slide left and right. Railings 8 are arranged on the front side and the rear side of the main support 1 in an extending mode from the position where the ice pushing frame 703 is in a shrinking state to the ice making area of the main support 1, and sliding rails 705 are arranged on the inner sides of the upper cross rods of the railings 8 and are matched with the pulleys 704; the railings 8 in the ice making area of the main bracket 1 are arranged in an intermittent separation manner to separate the upper and lower moving spaces of the protruding lugs 308 on the flat base 301, and simultaneously play a role in preventing ice blocks from sliding and separating.

During the use, earlier through the operation of switch board control double-end step motor 302, its two output synchronous operation, with the help of the transmission of drive shaft 305 and transmission shaft 306, drive whole lead screw lift 304 synchronous operation for dull and stereotyped base 301 level rises, closely laminates with ice mould 2 bottom, accomplishes sealedly, again from the top opening of ice mould 2 with water injection in the ice chamber that forms. Before ice making is started, all the heating medium in the radiating pipe 507 is discharged into the heating medium energy storage tank 501 by using a valve so as to prevent the heating medium from being frozen in the LNG cold exchange process; at the beginning of ice making, LNG enters the input pipe 407 through the LNG inlet 401, and then branches into the liquid cooling pipes 403 through the lower shunt pipes 404 for heat exchange, so that water in the ice mold 2 is condensed into ice blocks, and the heat exchanged LNG is gasified in the output pipe 406 for subsequent use. When the water in the ice mold 2 is completely changed into ice blocks, the introduction of LNG is stopped, the hot medium in the hot medium energy storage tank 501 enters the delivery pipe 506 under the action of the hot medium circulating pump 502, enters the heat dissipation pipe 507 under the action of the shunt pipe 503, and exchanges heat with the surfaces of the ice blocks, so that the surfaces of the ice blocks, which are in contact with the ice mold 2, are melted, at the moment, the double-head stepping motor 302 runs reversely, so that the flat base 301 is slowly separated from the bottom end of the ice mold 2, the ice blocks are separated from the ice mold 2 under the action of the gravity of the ice blocks and fall on the flat base 301, and the hot medium enters the hot medium energy storage tank 501 through the flow merging pipe 504 and the recovery pipe 505 to be stored and heated. After the flat base 301 descends to the bottom of the main support 1, the control motor 701 in the ice pushing device operates, the telescopic rod in the hydraulic telescopic cylinder 702 extends out, the ice pushing frame 703 is pushed to move leftwards along the slide rail 705 on the railing 8, ice cubes are slowly pushed out of the ice making area, and ice making is completed.

In other embodiments of the present invention, the ice mold 2 is wrapped with a polyurethane foam insulation material.

Finally, it should be noted that the above-mentioned embodiments are only for illustrating the technical solutions of the present invention, and the present invention is not limited to the above-mentioned examples, and those skilled in the art should also make changes, modifications, additions or substitutions within the spirit and scope of the present invention.

Claims (10)

1. An LNG direct cooling formula ice machine which characterized in that: the LNG ice making system comprises a main bracket, an LNG ice making system, an ice melting system and a control system, wherein the main bracket is divided into a control area and an ice making area; the LNG ice making system comprises an LNG circulating refrigeration pipeline, ice molds and a lifting platform, wherein the ice molds are fixedly arranged on the upper half part of an ice making area of a main bracket and are vertically staggered by a plurality of transverse clapboards and a plurality of vertical clapboards, the vertical clapboards are provided with upper and lower openings, the vertical clapboards are provided with a plurality of through holes penetrating through the length direction of the vertical clapboards, the lifting platform is arranged below the ice molds and comprises a double-head stepping motor, T-shaped gear direction changers, a screw rod lifter, a driving shaft, a transmission shaft and a flat plate base, the double-head stepping motor is fixedly arranged at the central position of the outer side of the left end of the ice molds, rotating shafts at the two ends of the double-head stepping motor are respectively and fixedly connected with a driving shaft through couplings, the other ends of the two driving shafts are respectively connected with a T-shaped gear commutator through the couplings, the two T-shaped gear direction changers are respectively and fixedly arranged on two vertical brackets at the left side of the main bracket, and the mounting height of the two T-head stepping motors is parallel and level with the double-head stepping motor, the output end of the T-shaped gear direction changer is sequentially connected with a plurality of lead screw lifters through a transmission shaft, the lead screw lifters are fixedly arranged on the outer side of a middle cross beam of a bracket at the lower end of the ice mold, are symmetrical front and back and are flush with the T-shaped gear direction changer; the front side and the rear side of the flat plate base are respectively provided with a protruding lug corresponding to the screw rod lifter, and the lower end of a screw rod in the screw rod lifter is fixedly connected with the protruding lugs to drive the flat plate base to move up and down; the LNG circulating refrigeration pipeline is divided into a conveying part and a refrigeration part, the conveying part comprises an input pipe, an output pipe, an upper flow merging pipe and a lower flow dividing pipe, the refrigeration part comprises a plurality of liquid cooling pipes in S-shaped loops, the liquid cooling pipes are arranged in through holes of the vertical partition plate, two ends of each liquid cooling pipe are respectively communicated with the upper flow merging pipe and the lower flow dividing pipe, the input pipe is communicated with the lower flow dividing pipe, and the output pipe is communicated with the upper flow merging pipe;

the deicing system comprises a heat medium energy storage tank, a heat medium circulating pump, a heat medium circulating pipeline and a heating device, the heat medium energy storage tank is fixedly mounted on the rear side of a control area of a main support, a discharge port is formed in the lower portion of the heat medium energy storage tank and communicated with the heat medium circulating pump, the heat medium circulating pump is communicated with the heat medium circulating pipeline, the heat medium circulating pipeline comprises a conveying pipe, a flow dividing pipe, a plurality of radiating pipes, a flow converging pipe and a recycling pipe, the conveying pipe is communicated with the heat medium circulating pump and the flow dividing pipe, the plurality of radiating pipes are respectively mounted in through holes of a vertical partition plate, the lower end of each radiating pipe is communicated with the corresponding flow dividing pipe, the upper end of each radiating pipe is communicated with the corresponding flow converging pipe, the flow converging pipe is communicated with the heat medium energy storage tank through the recycling pipe, and the heating device is fixedly mounted on the heat medium energy storage tank;

the control system comprises a PLC explosion-proof control cabinet, a temperature sensor, a pressure sensor and a control valve, wherein the PLC explosion-proof control cabinet is fixedly arranged on the front side of the control area of the main bracket and is used for controlling the operation of the whole device; and the temperature sensor, the pressure sensor and the control valve are arranged on the LNG circulating refrigeration pipeline.

2. The LNG direct-cooling ice maker as claimed in claim 1, wherein: the ice pushing device is fixedly arranged at the junction of the control area and the ice making area of the main support, is positioned in the control area and comprises a control motor, a hydraulic telescopic cylinder and an ice pushing frame, the hydraulic telescopic cylinder is fixedly arranged at the bottom of the main support, a telescopic rod of the hydraulic telescopic cylinder points to the ice making area, the tail end of the telescopic rod is fixedly connected with the ice pushing frame, the ice pushing frame and the telescopic rod are vertically arranged and are of a cuboid structure, and the length of the ice pushing frame is slightly smaller than the width of the main support; the control motor is arranged at the side of the hydraulic telescopic cylinder to provide power.

3. The LNG direct-cooling ice maker as claimed in claim 1, wherein: and the flat plate base in the lifting platform is in a sealing state when contacting with the lower end of the ice mold.

4. The LNG direct-cooling ice maker as claimed in claim 1, wherein: the through holes arranged on the vertical partition plates are of a double-hole specification, one through hole is provided with a liquid cooling pipe, the other through hole is provided with a radiating pipe, and the two pipelines are alternately arranged; a temperature sensor, a pressure sensor and a low-temperature pneumatic stop valve are mounted on an output pipe of the LNG circulating refrigeration pipeline, and the temperature sensor, the pressure sensor and the low-temperature pneumatic stop valve are all connected with the PLC explosion-proof control cabinet; and the delivery pipe and the recovery pipe in the heat medium circulation pipeline are both provided with check valves.

5. The LNG direct-cooling ice maker as claimed in claim 1, wherein: and the outer side of the ice mold is wrapped with a polyurethane foaming thermal insulation material.

6. The LNG direct-cooling ice maker as claimed in claim 2, wherein: the lower end of the ice pushing frame is higher than the upper surface of the flat base in a falling state; the upper parts of the two ends of the ice pushing frame are also provided with sliding wheels, the lower parts of the front side and the rear side of the main support are provided with railings, and the inner sides of the cross bars at the upper ends of the railings are provided with sliding rails matched with the sliding wheels.

7. The LNG direct-cooling ice maker as claimed in claim 1, wherein: a transmission shaft for linking two adjacent screw rod lifters is fixed through a bearing with a seat; two output synchronous operation of double-end step motor drive the equal synchronous operation of whole lead screw lift for dull and stereotyped base is the level form and reciprocates.

8. The LNG direct-cooling ice maker as claimed in claim 1, wherein: the heating device adopts a solar heating system; or an electrical heating device.

9. The LNG direct-cooling ice maker as claimed in claim 1, wherein: and explosion-proof safety valves are arranged on pipelines of the conveying parts in the LNG circulating refrigeration pipeline and the heating medium circulating pipeline.

10. An LNG direct-cooling ice maker according to any one of claims 1 to 9, wherein:

the method comprises the following steps that firstly, a PLC explosion-proof control cabinet controls a lifting platform to operate, a flat plate base rises to be in sealing fit with the lower end of an ice mold, and water is injected from the upper end of the ice mold;

step two, introducing the LNG into an LNG circulating refrigeration pipeline in the ice maker under the pressure of the storage tank, introducing the LNG from the input pipe, distributing the LNG into the plurality of liquid cooling pipes through the lower flow dividing pipe, gasifying the LNG in the liquid cooling pipes, and completing cold exchange between the LNG and water through an ice mold to form ice blocks;

step three, closing LNG input, enabling a heating medium to enter the conveying pipe under the action of the heating medium circulating pump, enabling the heating medium to flow into the plurality of radiating pipes through the shunt pipes, and performing heat exchange with the surface of the ice block to melt the surface of the ice block, which is in contact with the ice mold;

step four, the PLC explosion-proof control cabinet controls the lifting platform to reversely operate, the flat base descends, and the ice blocks descend to the bottom along with the flat base under the action of self gravity; the ice pushing device operates to push out the ice blocks.

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