CN109553102B

CN109553102B - Control method for preparing high-density carbon dioxide

Info

Publication number: CN109553102B
Application number: CN201811542150.XA
Authority: CN
Inventors: 陈水宣; 陈吉鹏; 邱一卉; 洪海泳; 洪昭斌; 王水林; 徐虎修; 王其强
Original assignee: Xiamen University of Technology
Current assignee: Xiamen University of Technology
Priority date: 2018-12-17
Filing date: 2018-12-17
Publication date: 2022-06-10
Anticipated expiration: 2038-12-17
Also published as: CN109553102A

Abstract

The invention provides a control method for preparing high-density carbon dioxide, which comprises the following steps: judging the pressure of the liquid carbon dioxide before liquid feeding; when the liquid carbon dioxide reaches a preset pressure value, starting a rotary table, initializing equipment and then starting to feed liquid; rotating the turntable, transferring the extrusion cavity filled with the snowflake-shaped carbon dioxide to a pressing station, and pressing; rotating the turntable to drive the extrusion cavity filled with the blocky carbon dioxide to be transferred to a demoulding station for demoulding; rotating the turntable to transfer the extrusion cavity from which the blocky carbon dioxide is removed to a liquid inlet station; and circularly executing the second step to the fifth step, and respectively and simultaneously carrying out liquid feeding, pressing and demoulding on a liquid feeding station, a pressing station and a demoulding station. According to the invention, the multi-station on the turntable is controlled, so that the steps of liquid inlet, ice making and demolding are respectively and simultaneously carried out on different stations, the equipment operation is streamlined, the investment cost is reduced, and the working efficiency is improved.

Description

Control method for preparing high-density carbon dioxide

Technical Field

The invention relates to the field of solid carbon dioxide manufacturing, in particular to a control method for preparing high-density carbon dioxide.

Background

At present, the preparation of solid carbon dioxide usually utilizes a throttling expansion device to make liquid carbon dioxide physically change in a cavity to form a snowflake shape, then an extrusion mechanism extrudes the liquid carbon dioxide in an extrusion cavity to form high-density solid carbon dioxide, and finally the solid carbon dioxide is pushed out of the extrusion cavity.

In the process of preparing solid carbon dioxide, ice making, ice pressing and demolding are usually performed on different devices, each process needs to be processed for a period of time, the next process can be performed after the previous process is completed, ice making efficiency is low, and particularly in the process of batch production, batch devices are often needed for preparation, so that not only is efficiency low, but also large manpower and material cost is consumed. Therefore, the research and development of an efficient and economical method for preparing solid carbon dioxide are technical problems which are continuously solved by the technical personnel in the field.

Disclosure of Invention

The invention provides a control method for preparing high-density carbon dioxide, and aims to solve the problems of low efficiency and high cost of the existing preparation method.

The invention is realized in the following way:

a control method for preparing high-density carbon dioxide is characterized by comprising the following steps:

Step one, judging the pressure of liquid carbon dioxide before liquid feeding, and entering step two when the liquid carbon dioxide reaches a preset pressure value;

step two, starting the turntable, and starting liquid inlet after equipment initialization; the device comprises a turntable, a liquid inlet station, a pressing station and a demolding station, wherein the turntable is internally provided with a plurality of extrusion cavities, the extrusion cavities can rotate to be respectively in direct-facing fit with the liquid inlet station, the pressing station and the demolding station in sequence, and the liquid inlet process is that liquid carbon dioxide is filled with snowflake-shaped carbon dioxide to be pressed into the extrusion cavities positioned at the liquid inlet station after heat exchange;

rotating the turntable, transferring the extrusion cavity filled with the snowflake carbon dioxide to the pressing station, and pressing, wherein the first power device is started in the pressing process, so that the snowflake carbon dioxide in the extrusion cavity is pressed into block carbon dioxide;

rotating the turntable to drive the extrusion cavity filled with the blocky carbon dioxide to transfer to the demolding station for demolding, wherein the demolding process is to start a second power device and a third power device to remove the blocky carbon dioxide from the extrusion cavity;

rotating the turntable, and transferring the extrusion cavity from which the blocky carbon dioxide is removed to a liquid inlet station;

And the second step to the fifth step are circularly executed, and liquid feeding, pressing and demolding are simultaneously carried out on the liquid feeding station, the pressing station and the demolding station respectively.

Further, in a preferred embodiment of the present invention, in the step one, the preset pressure value is 1.5 to 2.2 Mpa.

Further, in a preferred embodiment of the present invention, the second step specifically includes:

s21, opening the turntable, and judging whether each station enters an initial state;

s22, starting the liquid inlet electromagnetic valve and the sealing cylinder after each station enters an initial state; the sealing cylinder is arranged at an extrusion cavity opening of the liquid inlet station and used for sealing the extrusion cavity during liquid inlet;

s23, liquid feeding is started, and the liquid carbon dioxide sequentially flows through a heat exchanger and a liquid feeding electromagnetic valve and then enters the extrusion cavity; the liquid inlet station comprises a heat exchanger and a liquid inlet electromagnetic valve which are sequentially communicated, and an expansion throttling opening is formed in the liquid inlet electromagnetic valve;

and S24, after liquid feeding is finished, retracting the sealed cylinder to open the cavity opening of the extrusion cavity.

Further, in the preferred embodiment of the present invention, in step S23, the liquid inlet flow rate is 0.6-1.8 m³And/min, wherein the liquid inlet time is 10-20 s.

Further, in a preferred embodiment of the present invention, the third step specifically includes:

s31, starting the turntable to drive the snowflake carbon dioxide in the extrusion cavity to move to a pressing station;

s32, starting a hydraulic oil cylinder and pressing the snowflake-shaped carbon dioxide;

and S33, detecting the position of the hydraulic oil cylinder, maintaining the pressure for 2S when the hydraulic oil cylinder is at a first front limit, and then retracting the hydraulic oil cylinder, wherein the first front limit is the limit position of the downward pressing movement of the hydraulic oil cylinder.

Further, in a preferred embodiment of the present invention, the step four specifically includes:

s41, starting the turntable to drive the snowflake-shaped carbon dioxide in the extrusion cavity to move to a demolding station;

s42, starting a second power device, and ejecting the blocky carbon dioxide in the extrusion cavity;

and S43, after the second power device is detected to reach a second front limit, starting a third power device to push the blocky carbon dioxide away from the turntable, wherein the second front limit is the limit position of the upward ejection movement of the second power device.

Further, in a preferred embodiment of the present invention, the turntable is controlled by a hydraulic motor and a stepping motor at the same time, the hydraulic motor adjusts the rotation speed by a first adjustment value, and the stepping motor adjusts the rotation speed by a second adjustment value, wherein the first adjustment value is greater than the second adjustment value.

Further, in a preferred embodiment of the present invention, before the feeding, pressing or demolding is performed by rotating the turntable each time, determining whether the turntable is rotated to a position includes:

the position of the rotary table is detected through the electromagnetic induction switch, and mechanical limiting is carried out through a limiting port formed in the rotary table.

Further, in a preferred embodiment of the present invention, the method further comprises: and opening the conveyor belt to convey the blocky carbon dioxide pushed away from the rotary disc.

Further, in a preferred embodiment of the present invention, the method further comprises an alarm step: and setting the running time of the equipment for executing one cycle, stopping the equipment and giving an alarm when the running time exceeds the set time, wherein the step two to the step five are one cycle.

The invention has the beneficial effects that:

(1) according to the control method for preparing the high-density carbon dioxide, which is obtained through the design, the extrusion cavity is respectively in direct-facing fit with the liquid inlet station, the pressing station and the demolding station through rotating the turntable, the impact vibration is small in the preparation process, the flow operation is performed in the operation process, and the equipment investment cost is reduced;

(1) according to the invention, through the cyclic execution of the multi-station operation on the turntable, the steps of liquid feeding, ice making and demolding in the ice making process are respectively and simultaneously carried out on different stations, so that the working efficiency is improved.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.

FIG. 1 is a flow chart of a control method for producing high-density carbon dioxide in example 1 of the present invention;

FIG. 2 is a schematic structural view of a high-density carbon dioxide forming apparatus in example 2 of the present invention;

FIG. 3 is an enlarged partial schematic view at A in FIG. 2;

FIG. 4 is a schematic structural view of multi-station fitting in a high-density carbon dioxide molding apparatus according to example 2 of the present invention;

FIG. 5 is a longitudinal cut-away schematic view of FIG. 4;

FIG. 6 is an enlarged partial schematic view at B in FIG. 4;

FIG. 7 is a schematic view showing the structure of a wound heat exchange tube in example 2 of the present invention;

FIG. 8 is a schematic structural view of a turntable in a high-density carbon dioxide forming apparatus according to example 2 of the present invention;

FIG. 9 is a schematic structural view of an extrusion cavity in a high-density carbon dioxide molding apparatus according to embodiment 2 of the present invention;

FIG. 10 is a longitudinal cut-away schematic view of FIG. 9;

fig. 11 is a schematic structural view of an extrusion cavity in a high-density carbon dioxide molding apparatus according to embodiment 2 of the present invention.

Icon: 1-a frame body; 11-putting on shelves; 12-off-shelf; 13-a support plate; 2-a turntable; 21-a chamber; 22-a liquid inlet station; 23-a pressing station; 24-a demolding station; 25-an upper support plate; 26-a lower support plate; 27-extruding the die cavity; 271-cavity; 271A-cavity plate; 271B-through hole; 271C-a groove; 271D-an exhaust chamber; 272-airflow caps; 273-an outer cavity; 28-a detection device; 3-a liquid inlet unit; 31-a heat exchanger; 311-heat exchange barrel; 312-coiled heat exchange tubes; 313-an exhaust duct; 32-liquid inlet electromagnetic valve; 4-a pressing unit; 41-briquetting; 42-a first power plant; 421-a hydraulic oil cylinder; 422-briquetting connecting rod; 5-a demoulding unit; 51-a second power plant; 52-a third power plant; 53-a limiting support plate; 531-top plate; 532-a limiting rod; 54-a guide; 6-a conveyor belt.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings of the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention. Thus, the following detailed description of the embodiments of the present invention, as presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like, indicate orientations and positional relationships based on those shown in the drawings, and are used only for convenience of description and simplicity of description, and do not indicate or imply that the equipment or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be considered as limiting the present invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

Example 1

Referring to fig. 1, the present invention provides a control method for preparing high-density carbon dioxide, which is characterized by comprising the following steps:

and S1, after the equipment is started in the step I, initializing the equipment, and checking whether the equipment normally operates. And (5) judging the pressure of the liquid carbon dioxide before liquid feeding, and entering the step two when the liquid carbon dioxide reaches a preset pressure value.

Optionally, in the first step, the preset pressure value is 1.5-2.2 Mpa. In general, dry ice production needs to be carried out at high pressure (8.0MPa), gaseous CO ₂The liquid is liquefied at normal temperature, is throttled and expanded to be low-temperature liquid, and then enters an ice drying machine to prepare dry ice, so that the power consumption of the equipment is extremely high. The embodiment of the invention adopts a low-pressure method (1.5 MPa-2.5 MPa) to prepare the dry ice. Liquid CO at low pressure₂After further cooling, the carbon dioxide enters the solid carbon dioxide forming equipment directly through throttling expansion, and the power consumption of the equipment is greatly reduced compared with that of a high-pressure method.

S2, in the second step, the turntable 2 is started, and liquid feeding is started after equipment initialization; wherein, be equipped with a plurality of extrusion die cavities 27 in the carousel 2, and can rotate and make extrusion die cavity 27 just is in proper order just to cooperating with feed liquor station 22, suppression station 23 and drawing of patterns station 24 respectively. The liquid inlet process is to fill the snowflake carbon dioxide to be pressed into the extrusion cavity 27 positioned at the liquid inlet station 22 after the liquid carbon dioxide is subjected to heat exchange.

Optionally, the step two specifically includes:

and S21, opening the turntable 2 and judging whether each station enters an initial state. Optionally, the process of determining whether each station enters the initial state is as follows: whether a pressing block 41 of the pressing station 23 is positioned right above a cavity 21 of the extrusion cavity 27 is detected, and if not, the turntable 2 can be started to adjust the position of the turntable 2. As the extrusion cavities 27 on the station turntables 2 are the same and are matched with the stations in an alignment way, as long as the pressing block 41 of the pressing station 23 is positioned right above the cavity 21 of the extrusion cavity 27, the pressing block can be ensured to freely enter and exit the extrusion cavity 27, and the stations are in an initial state.

And S22, starting the liquid inlet electromagnetic valve 32 and the sealed cylinder after each station enters the initial state. The sealing cylinder movably set up in the extrusion die cavity 27 accent of feed liquor station 22, under the initial condition, sealing cylinder with there is certain clearance between the accent of extrusion die cavity 27, be used for preventing carousel 2 rotatory in-process card is dead. When the turntable 2 rotates to a corresponding station, the sealing cylinder presses down to seal the extrusion cavity 27, and a channel for allowing snowflake-shaped carbon dioxide to enter the extrusion cavity 27 is arranged in the sealing cylinder. The orifice of the extrusion cavity is sealed by the sealing cylinder in the liquid inlet process, the snowflake-shaped carbon dioxide enters from the channel of the sealing cylinder, the raw material is prevented from leaking, and the heat preservation effect is good.

And S23, starting liquid inlet, and enabling the liquid carbon dioxide to enter the extrusion cavity 27 after sequentially flowing through the heat exchanger 31 and the liquid inlet electromagnetic valve 32. The liquid inlet station 22 comprises a heat exchanger 31 and a liquid inlet electromagnetic valve 32 which are communicated in sequence, and an expansion throttling opening is arranged in the liquid inlet electromagnetic valve 32. Liquid carbon dioxide flows through the liquid inlet pipeline and enters the heat exchanger 31, and the liquid carbon dioxide fully flows in the heat exchanger 31, so that the effect of fully cooling the liquid carbon dioxide is achieved, and the conversion rate of the snowflake-shaped carbon dioxide is improved. The outlet of the expansion throttling orifice is arranged at the liquid inlet station 22 so as to fill snowflake-shaped carbon dioxide into the cavity. The liquid carbon dioxide works on itself at the orifice, wherein the heat absorbing part is converted into gaseous carbon dioxide and the heat releasing part is converted into dry ice entering the extrusion cavity 27.

Optionally, in step S23, the liquid inlet flow rate is 0.6 to 1.8m³And/min, wherein the liquid inlet time is 10-20 s. When the liquid inlet time is short, the liquid carbon dioxide cannot perform sufficient heat exchange in the heat exchanger 31, and the temperature cannot be sufficiently reduced, so that the conversion rate of the snowflake-shaped carbon dioxide in the extrusion cavity 27 is reduced. And the ice making efficiency is lowered when the liquid feeding time is too long.

And S24, after liquid feeding is finished, the sealing cylinder moves upwards to open the cavity opening of the extrusion cavity 27, so that the turntable 2 can rotate freely.

And S3, rotating the turntable 2, transferring the extrusion cavity 27 filled with the snowflake-shaped carbon dioxide to the pressing station 23, and pressing. In the pressing process, the first power device 42 is started to drive the pressing block 41 to move downwards, snow-shaped carbon dioxide in the extrusion cavity 27 is pressed into block-shaped carbon dioxide, and then the hydraulic oil cylinder is retracted. Optionally, the pressing process time is 10-15 s.

Optionally, the third step specifically includes:

and S31, after liquid feeding is finished, starting the turntable 2 to drive the snowflake carbon dioxide in the extrusion cavity 27 to move to the pressing station 23.

And S32, detecting the position of the pressing block 41. Optionally, it is detected whether the pressing block 41 is located right above the cavity 21, and if not, the turntable 2 may be rotated to adjust its position.

And S33, detecting the position of the hydraulic oil cylinder 421, driving the press block to press downwards by the hydraulic oil cylinder, maintaining the pressure for 2S when the hydraulic oil cylinder 421 is in the first front limit position, compacting the snowflake-shaped carbon dioxide in the extrusion cavity 27, and then retracting the hydraulic oil cylinder 421. The first front limit is a limit position of a downward pressing movement of the hydraulic oil cylinder 421.

S4, in the fourth step, the turntable 2 rotates to drive the extrusion die cavity 27 filled with the blocky carbon dioxide to rotate to the demolding station 24 for demolding. The demolding process is to start the second power device 51 and the third power device 52 to remove the carbon dioxide blocks from the extrusion cavity 27.

Optionally, the fourth step specifically includes:

and S41, starting the turntable 2 to drive the snowflake carbon dioxide in the extrusion cavity 27 to move to the demolding station 24.

And S42, starting the second power device 512, and ejecting the block carbon dioxide in the extrusion cavity 27 upwards to the cavity opening of the extrusion cavity 27.

And S43, after the second power device 51 is detected to reach a second front limit position, starting the third power device 52 to push the block-shaped carbon dioxide at the cavity opening outwards away from the turntable 2. When the carbon dioxide lumps are pushed away, the second power unit 51 returns to the original position. The second front limit is a limit position of the upward ejection movement of the second power device 51.

And S5, rotating the turntable 2 to transfer the extrusion cavity 27 with the removed block-shaped carbon dioxide to the liquid inlet station 22.

And circularly executing the second step to the fifth step, so that liquid feeding, pressing and demolding are simultaneously carried out on the liquid feeding station 22, the pressing station 23 and the demolding station 24 respectively. The turntable type multi-station is designed, three steps of processes of liquid feeding, pressing and demolding can be realized by controlling the rotation of the turntable 2, a plurality of blocks of solid carbon dioxide can be prepared at one time, and the preparation efficiency of the high-density carbon dioxide is greatly improved.

Optionally, the turntable 2 is controlled by a hydraulic motor and a stepping motor at the same time, the speed regulation range of the hydraulic motor is large, the rotating speed of the turntable 2 is regulated by a first regulating value through outputting large torque, the speed regulation range of the stepping motor is small, the rotating speed of the turntable 2 is regulated by a second regulating value, and the first regulating value is larger than the second regulating value. Optionally, the control precision of the hydraulic motor is 5% and the control precision of the stepping motor is 5%.

Optionally, before the rotating disc 2 is rotated each time to feed liquid, press or demold, whether the rotating disc 2 rotates in place is judged, and the method specifically comprises the following steps:

The position of the turntable 2 is detected through an electromagnetic induction switch, and mechanical limitation is performed by utilizing a limiting port formed in the turntable 2. Optionally, the detection device 28 may be, for example, a laser detector, an infrared sensor, or the like, and is used to ensure that the extrusion cavity 27 is aligned and matched with each station on the turntable 2. Optionally, the positioning is assisted by a servo motor. Optionally, when the detecting device 28 detects that the position of the turntable 2 is not in place, the stepping motor is controlled to further adjust the position of the turntable 2.

Optionally, the method further includes: the conveyor 6 is opened to convey the carbon dioxide lumps pushed off from the turntable 2. The conveying plane of the conveying belt 6 is flush with the top surface of the rotary table 2, and the formed high-density solid carbon dioxide is conveyed to a storage bin or a production line through the conveying belt 6 and can be used for subsequent use.

Optionally, the method further comprises an alarm step: the setting equipment executes the running time of one cycle, and when the running time exceeds the setting time, the equipment is stopped and alarms. Wherein, the step two to the step five are executed as a cycle. Optionally, one cycle period of equipment operation is set to be 30-35 s, and if the cycle period of equipment operation exceeds 35s, the equipment is shut down and gives an alarm, so that an operator can conveniently maintain and check faults. When the cycle period of the equipment operation is 30-35 s, the ice making efficiency of the equipment reaches 10-12 s/block.

Optionally, referring to fig. 1 and 3, the liquid inlet station 22, the pressing station 23, and the demolding station 24 are provided with at least two stations, and the two stations are symmetrically arranged on the turntable 2. At the moment, the ice making efficiency of the equipment reaches 5-6 s/block.

Example 2

Referring to fig. 1, this embodiment provides a control method for preparing high-density carbon dioxide, which applies the following high-density carbon dioxide forming equipment:

referring to fig. 2, the embodiment provides a high-density carbon dioxide molding device, which includes a frame body 1, and a turntable 2, a liquid inlet unit 3, a pressing unit 4 and a demolding unit 5 which are arranged in the frame body 1. The units are independent and work separately to complete the preparation of high density solid carbon dioxide.

Optionally, referring to fig. 2 and 4, at least two liquid inlet stations 22, two pressing stations 23, and at least two demolding stations 24 are provided, and the same two stations are symmetrically provided on the turntable 2. According to the invention, the liquid inlet unit 3, the pressing unit 4 and the demoulding unit 5 are circumferentially arranged through a turntable type multi-station design, so that three steps of ice making, ice pressing and demoulding are realized, a plurality of massive solid carbon dioxide can be prepared at one time, and the production rate of equipment is greatly improved.

The frame body 1 comprises an upper frame 11 and a lower frame 12, and a support plate 13 is arranged in the upper frame 11. Backup pad 13 is used for fixing feed liquor unit 3, pressing unit 4 and drawing of patterns unit 5 to be provided with a plurality of with carousel 2 matched with opening.

But carousel 2 is installed with horizontal rotation in backup pad 13, be equipped with a plurality of die cavities that are circumference form and distribute, the die cavity has cavity 21 that link up from top to bottom, follows the circumference of carousel 2 is equipped with feed liquor station 22, suppression station 23 and drawing of patterns station 24, carousel 2 rotates the back, cavity 21 homoenergetic and feed liquor station 22, suppression station 23 and drawing of patterns station 24 are just to the cooperation in proper order. Optionally, the turntable 2 is fixed to a rotating bearing of the upper frame 11, the rotating bearing is connected with a servo motor through a transmission chain wheel, and the servo motor drives the turntable 2 to rotate along the circumferential direction.

Alternatively, referring to fig. 8, the turntable 2 includes an upper support plate 25, a lower support plate 26, and a plurality of extrusion cavities 27 disposed between the upper support plate 25 and the lower support plate 26. Go up the backup pad 25 with all seted up at least three material mouth on the bottom suspension fagging 26, go up the backup pad 25 with the material mouth of bottom suspension fagging 26 sets up relatively in the accent of extrusion die cavity 27. The extrusion cavities 27 are fixed in the cavity 21 of the cavity and can rotate along with the turntable 2 along the circumferential direction, and corresponding operations are executed after sequentially passing through the liquid inlet station 22, the pressing station 23 and the demolding station 24.

Alternatively, referring to fig. 9-11, the extrusion cavity 27 includes a hollow cavity 271, an air cap 272, and an outer cavity 273 surrounding the cavity 271. The cavity 271 comprises a plurality of cavity plates 271A, the cavity 271 is formed by mutually joggling the cavity plates 271A, each cavity plate 271A is provided with a honeycomb-shaped through hole 271B, the airflow cap 272 is covered on the through hole 271B, the leakage of solid carbon dioxide can be prevented, and gas generated in the extrusion process can be conveniently discharged from the through hole 271B. A groove 271C is formed in the outer wall of the cavity plate 271A, the position of the groove 271C is matched with that of the through hole 271B, and an exhaust cavity 271D is formed between the outer cavity 273 and the groove 271C. Optionally, a vent groove or a vent hole is formed in the lower support plate 26 at a position corresponding to the exhaust cavity 271D, and the vent groove or the vent hole is communicated with the bottom of the heat exchange barrel 311, so that it can be ensured that the gas exhausted from the cavity 271 can be smoothly exhausted from the outer cavity 273 and enter the heat exchanger 31.

Alternatively, as shown in fig. 10, the airflow cap 272 is a straight-slot sintered copper. The straight groove sintered copper is convenient to install, can ensure that only gas is allowed to pass through, and can further improve the exhaust capacity of the straight groove sintered copper. Optionally, the straight groove sintered copper is 60 meshes, and the sintered copper filter element has a large number of fine pores, so that high-pressure air flow in the compression process can be filtered into small air flow, and the effects of reducing noise and noise can be achieved.

Optionally, referring to fig. 4, a detecting device 28 is disposed on the turntable 2, and is used for detecting a position of the pressing block 41. Optionally, the device may be configured to detect whether the pressing block 41 is located right above the cavity chamber 21, and if not, the turntable 2 may be started to adjust the position of the cavity. Optionally, the positioning is assisted by a servo motor. The detection device 28 may be, for example, a laser detector, an infrared sensor, or the like, and is used to ensure that the extrusion cavity 27 is aligned with each station on the turntable 2.

The liquid inlet unit 3 comprises a heat exchanger 31 and a liquid inlet electromagnetic valve 32 which are sequentially communicated, an expansion throttling hole is arranged in the liquid inlet electromagnetic valve 32, and an outlet of the expansion throttling hole is formed in the liquid inlet station 22 so that the cavity is filled with snowflake-shaped carbon dioxide. The liquid carbon dioxide works on itself at the orifice, wherein the heat absorbing part is converted into gaseous carbon dioxide and the heat releasing part is converted into dry ice to enter the extrusion cavity 27.

Optionally, referring to fig. 5 and 7, the heat exchanger 31 is disposed in the middle of the support plate 13, and includes a heat exchange barrel 311 and a wound heat exchange tube 312 disposed in the heat exchange barrel 311, wherein:

The bottom of the heat exchange barrel 311 is communicated with the exhaust cavity 271D of the cavity, and the top of the heat exchange barrel 311 is connected with an exhaust pipeline 313 for exhausting gas to the outside atmosphere. Specifically, the invention adopts the tail gas generated by the pressing module to react with the liquid CO₂And cooling again, wherein low-temperature carbon dioxide gas generated in the throttling and compressing processes flows into the heat exchange barrel 311 through the exhaust cavity 271D and exchanges heat with liquid carbon dioxide in the heat exchanger 31, so that the temperature of the liquid inlet is reduced, and the conversion rate of the snowflake-shaped carbon dioxide is further improved.

The inlet of the wound heat exchange tube 312 is connected with a liquid inlet pipeline, and the outlet is connected with the liquid inlet electromagnetic valve 32. The wound heat exchange tube 312 is efficient and compact, can utilize waste heat, and has important functions in energy conservation and environmental protection. Specifically, liquid carbon dioxide flows through the liquid inlet pipeline and enters the heat exchanger 31 flows fully to reach the effect of fully cooling liquid carbon dioxide, the pipeline end connection of the heat exchanger 31 the liquid inlet solenoid valve 32.

Optionally, refer to fig. 3, 4 and show, liquid inlet unit 3 includes at least two liquid inlet solenoid valve 32, two liquid inlet solenoid valve 32 with the cavity 21 of die cavity is linked together, forms liquid inlet station 22, liquid carbon dioxide flows into at least two after dividing liquid inlet solenoid valve 32 has improved work efficiency and conversion rate.

The pressing unit 4 is arranged at the pressing station 23 and comprises a pressing block 41 and a first power device 42 for driving the pressing block 41 to enter the cavity to press the snowflake carbon dioxide. Optionally, referring to fig. 4, the first power device 42 includes a hydraulic cylinder 421 and a briquette connecting rod 422, and the hydraulic cylinder 421 drives the briquette connecting rod 422 to reciprocate in the vertical direction to drive the briquette 41 to move back and forth in the cavity 21 of the cavity to extrude the snowflake-shaped carbon dioxide. The hydraulic oil cylinder 421 can bear a large working pressure, is impact-resistant, and moves more stably.

The demolding unit 5 is arranged at the demolding station 24 and comprises a second power device 51 and a third power device 52, the second power device 51 is arranged at the bottom of the cavity 21 of the cavity and can reciprocate along the vertical direction to eject the blocky carbon dioxide out of the cavity 21, and the third power device 52 is arranged at the top of the cavity 21 and is used for pushing the ejected blocky carbon dioxide away from the turntable 2. Further, when the extrusion cavity 27 moves to the demolding station 24, the second power device 51 moves upward to push out the block-shaped carbon dioxide in the extrusion cavity 27, and the third power device 52 moves in the radial direction to push the block-shaped carbon dioxide at the cavity opening of the extrusion cavity 27 away from the turntable 2. Alternatively, the second power device 51 and the third power device 52 are cylinders.

Optionally, referring to fig. 2 and 6, the carbon dioxide removing device further includes a conveyor belt 6 fixedly disposed on the support plate 13, wherein a conveying plane of the conveyor belt 6 is flush with the top surface of the turntable 2, and is used for conveying stripped carbon dioxide blocks.

Optionally, referring to fig. 6, the mold further includes a limiting support plate 53 and a guide 54, where the limiting support plate 53 is disposed at the demolding station 24 and includes a top plate 531 and a plurality of limiting rods 532 fixed to the top plate 531 and extending downward. Therefore, the limiting support plate 53 is limited at the cavity opening and is matched with the third power device 52, and the block-shaped carbon dioxide is prevented from sliding randomly after being ejected by the second power device 51. The third power device 52 is fixed on the top plate 531, and the guiding element 54 is fixedly connected with the limiting rod 532 to limit the block carbon dioxide from entering the conveyor belt 6.

The working process of the high-density carbon dioxide forming equipment of the embodiment is as follows:

firstly, liquid carbon dioxide is added into a liquid inlet pipeline, the liquid carbon dioxide is fully heat-exchanged in a heat exchanger 31 and then is shunted through an outlet at the top of the heat exchanger 31 to enter a liquid inlet electromagnetic valve 32 of a liquid inlet station 22, throttling expansion is carried out at a throttling port in the liquid inlet electromagnetic valve 32, the liquid carbon dioxide works on the liquid carbon dioxide to convert a heat-absorbing part into gaseous carbon dioxide, a heat-releasing part is converted into snowflake carbon dioxide, the gaseous carbon dioxide flows into the heat exchanger 31 through a through hole 271B, an airflow cap 272 and an exhaust cavity 271D, and the gaseous carbon dioxide further exchanges heat with the liquid carbon dioxide in the heat exchange pipeline to further reduce the temperature of the gaseous carbon dioxide. The snowflake carbon dioxide in the extrusion cavity 27 is brought to the pressing station 23 through the turntable 2, the first power device 42 drives the pressing block 41 to press the snowflake carbon dioxide in the extrusion cavity 27, the pressing block 41 returns after the pressing is finished, and the blocky carbon dioxide in the extrusion cavity 27 is brought to the demolding station 24 through the turntable 2. The second power device 51 moves upwards to push out the blocky carbon dioxide in the extrusion cavity 27, and the third power device 52 moves along the radial direction to push the blocky carbon dioxide at the cavity opening of the extrusion cavity 27 away from the turntable 2 and enter the conveyor belt 6, so that the preparation of the blocky carbon dioxide is completed. In the process, the liquid inlet unit 3, the pressing unit 4 and the demolding unit 5 work simultaneously, liquid inlet, pressing and demolding processes are carried out in different cavities simultaneously, and the preparation efficiency of the blocky carbon dioxide is greatly improved.

It is understood that, when the high-density carbon dioxide forming apparatus in this embodiment is used to produce high-density carbon dioxide, the corresponding contents in embodiment 1 can be referred to for the control method.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A control method for preparing high-density carbon dioxide is characterized by comprising the following steps:

step one, judging the pressure of liquid carbon dioxide before liquid inlet, and entering step two when the liquid carbon dioxide reaches a preset pressure value, wherein the preset pressure value is 1.5-2.2 Mpa;

step two, starting the turntable, and starting liquid inlet after equipment initialization; wherein, be equipped with a plurality of extrusion die cavities in the carousel, and can rotate the messenger extrusion die cavity is just to the cooperation in proper order with feed liquor station, suppression station and drawing of patterns station respectively, and the feed liquor process fills into the snowflake form carbon dioxide of treating the suppression in extrusion die cavity (27) that lie in the feed liquor station behind the heat transfer for liquid carbon dioxide, and the feed liquor flow is 0.6 ~ 1.8m ³The liquid inlet time is 10-20 s;

2. The control method for preparing high-density carbon dioxide according to claim 1, wherein the second step specifically comprises:

S23, starting liquid feeding, and enabling the liquid carbon dioxide to sequentially flow through a heat exchanger and a liquid feeding electromagnetic valve and then enter the extrusion cavity; the liquid inlet station comprises a heat exchanger and a liquid inlet electromagnetic valve which are sequentially communicated, and an expansion throttling port is arranged in the liquid inlet electromagnetic valve;

and S24, after liquid inlet is finished, retracting the sealed air cylinder to open the cavity opening of the extrusion cavity.

3. The control method for preparing high-density carbon dioxide according to claim 1, wherein the third step specifically comprises:

4. The control method for preparing high-density carbon dioxide according to claim 1, wherein the fourth step specifically comprises:

S42, starting a second power device, and ejecting the massive carbon dioxide in the extrusion cavity;

5. The control method for producing high-density carbon dioxide according to claim 1, wherein the turntable is simultaneously controlled by a hydraulic motor and a stepping motor, the hydraulic motor is adjusted at a first adjustment value, the stepping motor is adjusted at a second adjustment value, and the first adjustment value is greater than the second adjustment value.

6. The method for controlling the production of high-density carbon dioxide according to any one of claims 1 to 5, further comprising determining whether the turntable has rotated to a position before feeding, pressing or demolding each time the turntable is rotated, specifically comprising:

7. The control method for producing high-density carbon dioxide as claimed in claim 6, further comprising: and opening the conveyor belt to convey the blocky carbon dioxide pushed away from the rotary disc.

8. The control method for producing high-density carbon dioxide as claimed in claim 7, further comprising an alarm step of: and setting the running time of the equipment for executing one cycle, stopping the equipment and giving an alarm when the running time exceeds the set time, wherein the step two to the step five are one cycle.