KR102270289B1 - Liquid particle counter system - Google Patents

Abstract

The present invention relates to a particle measurement system implemented to measure the number and size of particles floating in a certain amount of liquid. The particle measurement system comprises: a particle sensor for measuring the number and size of floating particles contained in liquid or air, which is an object to be measured; a particle controller for supplying electricity necessary for driving the particle sensor; a bellows sampler for sucking the object to be measured from the particle sensor in its own direction with a constant pressure to supply the object to be measured to the particle sensor at a constant flow rate; and a bellows controller for supplying electricity necessary for driving the bellows sampler, receiving the measurement data from the particle sensor, and transmitting the data to a computer device in which a programmable logic controller (PLC) program is installed.

Description

Particle counting system {LIQUID PARTICLE COUNTER SYSTEM}

The present invention relates to a particle measurement system, and more particularly, to a particle measurement system implemented to measure the number and size of particles suspended in a predetermined amount of liquid.

Optical liquid particle sensors and counters are utilized in a variety of industries including semiconductor, pharmaceutical and microelectronics industries.

In some industrial settings, optical liquid particle sensors and counters become important tools for continuous monitoring of pure liquids and compositions utilized in operations such as, for example, pharmaceutical production subject to stringent regulatory requirements related to particulate contamination. In other industrial environments, optical liquid particle sensors and counters become important tools for providing quality control analysis.

In particular, if the fluid is contaminated with unnecessary particles, it can be quickly identified and the process can be stopped at an early stage, thereby avoiding wastage due to the manufacture of defective products. For example, in semiconductors and other cleanroom environments or industries where sterilization and clean production are required (eg, the pharmaceutical industry), the liquid materials utilized to manufacture the final product ensure adequate purity and contain any unwanted particles suspended in the fluid. It is continuously monitored to ensure that the particles are within tolerance.

A challenge with modern liquid particle counters is damage to internal components of liquid particle counters, such as detector arrays or light sources, caused by changes in flow rate or bubbles within the flow chamber, particularly utilizing high-power light sources to detect smaller particles. occurs in systems that For example, bubbles that are larger in size than the target particles as they pass through the flow chamber disperse large amounts of electromagnetic radiation that can overload and damage the collection and detection system of the particle counter.

Additionally, if the flow rate of the liquid through the particle counter's flow chamber is too low or stopped, the light source can heat the particles towards the flow chamber or liquid that scatters strong radiation into the optical system, damaging and damaging the collection and detection system. / or overheat and damage the light source itself.

On the other hand, the above-mentioned background art is technical information that the inventor possessed for the derivation of the present invention or acquired in the process of derivation of the present invention, and it cannot necessarily be said to be a known technique disclosed to the general public before the filing of the present invention .

Korean Patent Publication No. 10-2013-0143534

One aspect of the present invention provides a particle measurement system implemented to measure the number and size of particles suspended in a predetermined amount of liquid.

The technical problems of the present invention are not limited to the technical problems mentioned above, and other technical problems not mentioned will be clearly understood by those skilled in the art from the following description.

A particle measurement system according to an embodiment of the present invention includes a particle sensor that measures the number and size of particles in the form of particles included in liquid or air, which are objects to be measured.

In one embodiment, the particulate measurement system according to an embodiment of the present invention, a particle controller for supplying electricity required to drive the particle sensor; a bellows sampler for sucking the object to be measured from the particle sensor in its own direction with a constant pressure so that the object to be measured can be supplied to the particle sensor at a constant flow rate; and a bellows controller that supplies electricity necessary for driving the bellows sampler, receives measurement data from the particle sensor and transmits it to a computer device in which a programmable logic controller (PLC) program is installed.

In an embodiment, the particle measurement system according to an embodiment of the present invention may further include a measurement shelf for installing the particle sensor, the particle controller, the bellows sampler, and the bellows controller.

In an embodiment, the measurement shelf includes: a shelf body formed in a box shape forming an inner space; a first partition installed across the inner space of the shelf body in a left and right horizontal direction to partition the inner space of the shelf body in a vertical direction; a second partition installed across the upper seating space in a vertical and vertical direction to partition the upper seating space from among the upper seating space and the lower seating space partitioned by the first partition in left and right directions; a third partition installed across the left seating space in a left and right horizontal direction to vertically partition the left seating space among the left seating space and the right seating space partitioned by the second partition; a support installed under the shelf body to support the shelf body; and a plurality of wheels installed under the support to move the shelf body.

In an embodiment, the internal space of the shelf body includes a first seating space formed below the first partition corresponding to the lower seating space, and a second seating space formed by overlapping the upper seating space and the right seating space. A seating space, the upper seating space and the left seating space overlap each other, and may include a third seating space formed above the third partition and a fourth seating space formed below the third partition.

In an embodiment, the particle controller and the bellows controller may be installed to be seated in the fourth seating space.

In an embodiment, the particle sensor and the bellows sampler may be installed to be seated in the first seating space.

In an embodiment, the measurement shelf includes: a first shelf support installed on one side of the shelf body to support one side of the shelf body; and a second shelf support that forms a symmetrical structure with the first shelf support and is installed on the other side of the shelf body to support the other side of the shelf body.

In one embodiment, the first shelf support is formed to be rounded upwardly in the form of an arch, one end is bent in a lower right angle direction to be connected to one side of the shelf body, and the other end is to be seated on the floor. an arcuate support plate bent in a horizontal direction in the direction of the shelf body so as to an arcuate support frame formed to be rounded in an arcuate shape corresponding to the curvature of the arcuate support plate and connected to the inside of the arcuate support plate facing the shelf body to support the arcuate support plate; a frame fastening part installed inside the arcuate support plate facing the shelf body to fasten the arcuate support frame; and a plate driving unit installed on a vertical curved surface formed by bending one end of the arcuate support plate to raise or lower the arcuate support plate along one side of the shelf body.

In one embodiment, at least one wheel for moving in the left and right direction along the lower side of the arcuate support frame may be installed.

In an embodiment, the vertical curved surface is inserted and fastened into a sliding groove extending in a vertical direction along one side of the shelf body and formed to correspond to the shape of the sliding groove so as to move in the vertical direction along the sliding groove A sliding protrusion may be formed on a surface opposite to the shelf body.

In one embodiment, the plate driving unit, the first drive motor installed on the outer surface opposite to the inner surface of the vertical bent surface that is a surface opposite to the shelf body; a second driving motor installed to face the first driving motor; A first installed on the drive shaft of the first drive motor, inserted through a first through hole formed in the vertical bent surface, and connected to and connected to a first rack gear extending in the vertical direction along one side of the shelf body pinion gear; and a second installed on the driving shaft of the second driving motor, inserted through a second through hole formed in the vertical bent surface, and extending in the vertical direction while facing the first rack gear along one side of the shelf body It may include a; a second pinion gear engaged with the rack gear and installed.

In one embodiment, the frame fastening portion is formed in a cylindrical shape bent to correspond to the curvature of the arcuate support frame, is installed on the outer surface of the vertical bent surface is a first supporter into which the upper portion of the arcuate support frame is inserted ; a second support installed under the arcuate support plate and having a support through hole penetrating in the longitudinal direction corresponding to the shape of the arcuate support frame so that the arcuate support frame can be seated; a third support formed in a cylindrical shape bent to correspond to the curvature of the arcuate support frame and installed above a horizontal curved surface formed by bending the other end of the arcuate support plate to insert a lower portion of the arcuate support frame; and an elastic support spring installed inside the first support to support the upper side of the arcuate support frame inserted into the first support by using an elastic force.

In one embodiment, the arcuate support frame, the lower side is exposed to the lower side of the horizontal curved surface is installed on the bottom surface, as the arcuate support plate descends, the upper part is to be gradually inserted into the inside of the first supporter can

According to the above-described aspect of the present invention, power supply, sample supply, and CDA supply are implemented through one system, thereby measuring the number and size of particles suspended in a certain amount of liquid. can provide the effect of improving

The effects of the present invention are not limited to the above-mentioned effects, and various effects may be included within the range apparent to those skilled in the art from the description below.

1 is a diagram schematically illustrating a configuration of a particle measurement system according to an embodiment of the present invention.
2 is a view showing a measuring shelf according to the present invention.
3 is a view showing another embodiment of the measuring lathe 2 .
4 is a view showing an embodiment of the first shelf support of FIG. 3 .
FIG. 5 is a view showing the plate driving unit of FIG. 4 .
FIG. 6 is a view showing the frame fastening part of FIG. 4 .

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS [0010] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS [0010] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS [0023] Reference is made to the accompanying drawings, which show by way of illustration specific embodiments in which the invention may be practiced. These embodiments are described in sufficient detail to enable those skilled in the art to practice the present invention. It should be understood that the various embodiments of the present invention are different but need not be mutually exclusive. For example, certain shapes, structures, and characteristics described herein with respect to one embodiment may be embodied in other embodiments without departing from the spirit and scope of the invention. In addition, it should be understood that the location or arrangement of individual components within each disclosed embodiment may be changed without departing from the spirit and scope of the present invention. Accordingly, the detailed description set forth below is not intended to be taken in a limiting sense, and the scope of the invention, if properly described, is limited only by the appended claims, along with all scope equivalents to those claimed. Like reference numerals in the drawings refer to the same or similar functions throughout the various aspects.

Hereinafter, preferred embodiments of the present invention will be described in more detail with reference to the drawings.

1 is a diagram schematically illustrating a configuration of a particle measurement system according to an embodiment of the present invention.

Referring to FIG. 1 , a particle measurement system 10 according to an embodiment of the present invention includes a particle sensor 100 , a particle controller 200 , a bellows sampler 300 , and a bellows controller 400 .

The particle sensor 100 is driven using electricity supplied from the particle controller 200, and measures the number and size of particles in the form of particles included in the object to be measured, that is, the sample liquid or air. measure

In one embodiment, the particle sensor 100 transmits the object to be measured through a chemical neutralization line (DIW or CDA) (L1) and a sample line (L2) (pressure: 300 kPa or less, temperature: 15 to 35 ° C_) A regulator (HICV) (R) and a pressure gauge (G) may be installed at the front end to which the object to be measured is input.

In one embodiment, the particle sensor 100 receives the input (required when the installation place is 100 Class or more) through the third line (L3) of 3 to 10 L/min of Clean Dry Air.

The particle controller 200 is driven by a voltage of 100V to 200V, and supplies electricity necessary for driving the particle sensor 100 .

The bellows sampler 300 sucks the object to be measured from the particle sensor 100 in its direction with a constant pressure so that the object to be measured can be supplied to the particle sensor 100 at a constant flow rate.

In one embodiment, the bellows sampler 300 receives a pressure of about 300 to 500 kPa through the fourth line L4 and discharges the pressure of about 0.2 mPa through the fifth line L5. .

The bellows controller 400 is driven with a voltage of 100V to 200V, supplies electricity necessary for driving the bellows sampler 300 , receives measurement data from the particle sensor 100 , and a Programmable Logic Controller (PLC) program is installed It is transmitted to the computer device 700 through the Re-232C output (data transmission/reception).

That is, the particle controller 200 and the bellows controller 400 correspond to power supply devices that supply power required for driving each to the particle sensor 100 and the bellows sampler 300, respectively, and the particle sensor 100 and The bellows sampler 300 corresponds to a device for supplying samples and CDA.

The particulate measurement system 10 according to an embodiment of the present invention having the above-described configuration may further include a measurement shelf 500 .

The measurement shelf 500 includes a particle sensor 100 , a particle controller 200 , a bellows sampler 300 , and a bellows controller 400 .

In one embodiment, the metrology lathe 500 includes a lathe body 510 , a first partition 520 , a second partition 530 , a third partition 540 , a support 550 and a plurality of wheels 560 . includes

The shelf body 510 is formed in the form of a box that forms an internal space for installing components such as the particle sensor 100 , the particle controller 200 , the bellows sampler 300 and the bellows controller 400 , and the internal space A plurality of spaces are partitioned by the first partition 520 , the second partition 530 , and the third partition 540 .

The first partition 520 is installed to cross the internal space of the shelf body 510 in the left and right horizontal directions to partition the internal space of the shelf body 510 in the vertical direction.

The second partition 530 is installed to cross the upper seating space in the vertical and vertical directions to partition the upper seating space among the upper seating space and the lower seating space partitioned by the first partition 520 in the left and right directions.

The third partition 540 is installed across the left seating space in the left and right horizontal directions to vertically partition the left seating space among the left seating space and the right seating space partitioned by the second partition 530 .

The support 550 is installed on the lower side of the shelf body 510 to support the shelf body 510 , and the wheel 560 is installed along the lower side.

The wheel 560 is installed under the support 550 for movement of the shelf body 510 .

In one embodiment, the inner space of the shelf body 510 overlaps the first seating space S1 formed below the first partition 520 corresponding to the lower seating space, and the upper seating space and the right seating space. The second seating space S2, the upper seating space, and the left seating space are overlapped to form a lower side of the third seating space S3 and the third partition 540 formed above the third partition 540. The formed fourth seating space S4 may be formed.

In an embodiment, the particle controller 200 and the bellows controller 400 may be seated and installed in the fourth seating space S4.

In an embodiment, the particle sensor 100 and the bellows sampler 300 may be installed to be seated in the first seating space S1 .

The particulate measurement system 10 according to an embodiment of the present invention having the configuration as described above implements power supply, sample supply, and CDA supply through one system, so that it is suspended in a certain amount of liquid. It is possible to improve the efficiency of measuring the number and size of particles.

3 is a view showing another embodiment of the measuring lathe 2 .

Referring to FIG. 3 , a measurement shelf 500a according to another embodiment includes a shelf body 510 , a first partition 520 , a second partition 530 , a third partition 540 , a support 550 , It includes a plurality of wheels 560 , a first shelf support 570 , and a second shelf support 580 .

Here, the shelf body 510 , the first partition 520 , the second partition 530 , the third partition 540 , the support 550 and the plurality of wheels 560 are the same as the components of FIG. 2 . A description thereof will be omitted.

The first shelf support 570 has a symmetrical structure with the second shelf support 580 , and is installed on one side of the shelf body 510 to support one side of the shelf body 510 .

The second shelf support 580 has a symmetrical structure with the first shelf support 570 and is installed on the other side of the shelf body 510 to support the other side of the shelf body 510 .

The measurement shelf 500a according to another embodiment having the configuration as described above is a shelf body 510 on which the particle sensor 100, the particle controller 200, the bellows sampler 300, and the bellows controller 400 are seated. By supporting one side and the other side of the particle sensor 100, the particle controller 200, the bellows sampler 300 and the bellows controller 400, the vibration or shock generated in the shelf body 510 according to the driving, etc. is buffered. By doing so, measurement by the particle sensor 100 , the particle controller 200 , the bellows sampler 300 , and the bellows controller 400 can be made more precisely.

4 is a view showing an embodiment of the first shelf support of FIG. 3 .

Referring to FIG. 4 , the first shelf support 600 according to an embodiment includes an arcuate support plate 610 , an arcuate support frame 620 , a frame fastening unit 630 , and a plate driving unit 640 .

Here, the second shelf support 580 has a symmetrical structure with the first shelf support 600 according to an embodiment, and an arcuate support plate 610 and an arcuate support frame 620 of the first shelf support 600 to be described later. ), the frame fastening unit 630 and the plate driving unit 640 as components that can be equally applied, and the description thereof will be omitted to avoid duplication of description.

The arcuate support plate 610 is formed by bending upward in the shape of an arch, and one end 611 is bent in a lower right angle direction to be connected to one side of the shelf body 510, and the other end 612 is the bottom. It is bent in the horizontal direction in the direction of the shelf body 510 so as to be seated on the surface.

In one embodiment, the vertical curved surface 611 is inserted and fastened into a sliding groove 511 (see FIG. 3 ) extending in the vertical direction along one side of the shelf body 510 as shown in FIG. A sliding protrusion 611a formed to correspond to the shape of the sliding groove 511 so as to move in the vertical direction along the groove 511 may be formed on a surface opposite to the shelf body 510 .

The arcuate support frame 620 is formed to be rounded in an arcuate shape to correspond to the curvature of the arcuate support plate 610 , and is connected to the inside of the arcuate support plate 610 opposite to the shelf body 510 to install the arcuate support plate (610) is supported.

That is, the arcuate support frame 620 has one end positioned on the upper side inserted into the first support 631 and supported by the elastic support spring 634 , and the other end 621 positioned on the lower side is the arcuate support plate 610 . ) passes through the other end 612 and is seated on the bottom surface to support the arcuate support plate 610 .

However, when one end of the arcuate support frame 620 is inserted to the inner end of the first support 631 , the other end 621 of the arcuate support frame 620 is the bottom surface of the other end 612 of the arcuate support plate 610 . It is seated in the lower seating groove 612a formed in the arcuate support plate 610 alone to support the shelf body 510 .

In one embodiment, the arcuate support frame 620, the lower side 621 is exposed to the lower side of the horizontal bending surface is installed on the bottom surface, as the arcuate support plate 610 descends, the upper portion of the first support 631 ) can be gradually inserted into the inside.

In one embodiment, in the arcuate support frame 620, at least one wheel 622 for moving in the left and right direction along the lower side 621 may be installed.

The frame fastening part 630 is installed inside the arcuate support plate 610 facing the shelf body 510 to fasten the arcuate support frame 620 .

The plate driving unit 640 is installed on a vertical bent surface 611 formed by bending one end 611 of the arcuate support plate 610 to lift or lower the arcuate support plate 610 along one side of the shelf body 510 . lowers it

FIG. 5 is a view showing the plate driving unit of FIG. 4 .

Referring to FIG. 5 , the plate driving unit 640 includes a first driving motor 641 , an installed second driving motor 642 , a first pinion gear 643 , and a second pinion gear 644 .

The first driving motor 641 is installed on an outer surface opposite to the inner surface of the vertically curved surface 611 , which is a surface opposite to the shelf body 510 , to rotate the first pinion gear 643 .

The second driving motor 642 is installed to face the first driving motor 641 and rotates the second pinion gear 644 .

The first pinion gear 643 is installed on the drive shaft of the first drive motor 641, and is inserted through the first through hole H1 (see FIG. 6) formed in the vertical bent surface 611 to the shelf body ( The first rack gear R1 (refer to FIG. 3 ) extending in the vertical direction along one side of the 510 is engaged with and installed to be connected.

The second pinion gear 644 is installed on the drive shaft of the second drive motor 642, and is inserted through the second through hole H2 (see FIG. 6) formed in the vertical bent surface 611 to the shelf body ( Along one side of the 510 , the second rack gear R2 (refer to FIG. 3 ) is engaged with the second rack gear R2 (refer to FIG. 3 ) which is opposite to the first rack gear R1 and is installed.

The plate driving unit 640 having the configuration as described above drives the first shelf support 570 to be lifted or lowered so that the shelf body 510 can be stably supported by the first shelf support 570, It is possible to optimally support the shelf body 510 by the first shelf support 570 .

FIG. 6 is a view showing the frame fastening part of FIG. 4 .

Referring to FIG. 6 , the frame coupling part 630 includes a first support 631 , a second support 632 , a third support 633 , and an elastic support spring 634 .

The first support 631 is formed in a cylindrical shape bent to correspond to the curvature of the arcuate support frame 620, is installed on the outer surface of the vertical bent surface 611, the upper portion of the arcuate support frame 620 is inserted do.

The second support 632 is installed on the lower side of the arcuate support plate 610, and is formed through in the longitudinal direction corresponding to the shape of the arcuate support frame 620 so that the arcuate support frame 620 can be seated and supported. A support through hole 632a is formed.

The third support 633 is formed in a cylindrical shape bent to correspond to the curvature of the arcuate support frame 620, and the other end 612 of the arcuate support plate 610 is bent to form a horizontal curved surface 612. It is installed on the upper side of the lower portion of the arcuate support frame 620 is inserted.

The elastic support spring 634 is installed inside the first support 631 and supports the upper side of the arcuate support frame 620 inserted into the first support 631 by using an elastic force.

The frame fastening part 630 having the above-described configuration may fasten the arcuate support frame 620 so that the arcuate support frame 620 is spaced apart from the arcuate support plate 610 to be stably supported.

The above-described embodiments are for illustration, and those of ordinary skill in the art to which the above-described embodiments pertain can easily transform into other specific forms without changing the technical idea or essential features of the above-described embodiments. You will understand. Therefore, it should be understood that the above-described embodiments are illustrative in all respects and not restrictive. For example, each component described as a single type may be implemented in a dispersed form, and likewise components described as distributed may be implemented in a combined form.

The scope to be protected through this specification is indicated by the claims described below rather than the above detailed description, and it should be construed to include all changes or modifications derived from the meaning and scope of the claims and their equivalents. .

10: Particulate measurement system
100: particle sensor
200: particle controller
300: bellows sampler
400: bellows controller
500: measuring lathe
600: first shelf support

Claims (3)

a particle sensor for measuring the number and size of suspended particles in the form of particles included in liquid or air, which are objects to be measured;
a particle controller for supplying electricity necessary for driving the particle sensor;
a bellows sampler that sucks the object to be measured from the particle sensor in its own direction with a constant pressure so that the object to be measured can be supplied to the particle sensor at a constant flow rate; and
A bellows controller that supplies electricity necessary for driving the bellows sampler, receives measurement data from the particle sensor and transmits it to a computer device in which a programmable logic controller (PLC) program is installed; includes,
Further comprising; a measuring shelf for installing the particle sensor, the particle controller, the bellows sampler, and the bellows controller,
The measuring shelf,
a shelf body formed in a box shape forming an inner space;
a first partition installed across the inner space of the shelf body in a left and right horizontal direction to partition the inner space of the shelf body in a vertical direction;
a second partition installed across the upper seating space in a vertical and vertical direction to partition the upper seating space from among the upper seating space and the lower seating space partitioned by the first partition in left and right directions;
a third partition installed across the left seating space in a left and right horizontal direction to vertically partition the left seating space among the left seating space and the right seating space partitioned by the second partition;
a support installed under the shelf body to support the shelf body; and
Includes; a plurality of wheels installed on the lower portion of the support for movement of the shelf body;
The inner space of the shelf body,
A first seating space formed below the first partition corresponding to the lower seating space, a second seating space formed by overlapping the upper seating space and the right seating space, and the upper seating space and the left seating space It is formed to be overlapped with a third seating space formed above the third partition and a fourth seating space formed below the third partition,
The particle controller and the bellows controller,
It is seated and installed in the fourth seating space,
The particle sensor and the bellows sampler are,
It is seated and installed in the first seating space,
The measuring shelf,
a first shelf support installed on one side of the shelf body to support one side of the shelf body; and
It further includes; a second shelf support that forms a symmetrical structure with the first shelf support and is installed on the other side of the shelf body to support the other side of the shelf body,
The first shelf support is,
It is formed by bending upward in an arch shape, and one end is bent in a lower right angle direction to be connected to one side of the shelf body, and the other end is bent in the horizontal direction in the direction of the shelf body so that the other end can be seated on the floor surface. an arcuate support plate;
an arcuate support frame formed to be rounded in an arcuate shape corresponding to the curvature of the arcuate support plate and connected to an inner side of the arcuate support plate facing the shelf body to support the arcuate support plate;
a frame fastening part installed inside the arcuate support plate facing the shelf body to fasten the arcuate support frame; and
and a plate driving unit installed on a vertical bent surface formed by bending one end of the arcuate support plate to elevate or lower the arcuate support plate along one side of the shelf body;
The arcuate support frame,
At least one wheel for moving left and right along the lower side is installed,
The vertical curved surface is
A sliding protrusion formed to correspond to the shape of the sliding groove is inserted and fastened into a sliding groove extending in the vertical direction along one side of the shelf body to move vertically along the sliding groove on a surface opposite to the shelf body. is formed,
The plate driving unit,
a first driving motor installed on an outer surface opposite to an inner surface of the vertical bent surface, which is a surface opposite to the shelf body;
a second driving motor installed to face the first driving motor;
A first installed on the drive shaft of the first drive motor, inserted through a first through hole formed in the vertical bent surface, and connected to and connected to a first rack gear extending in the vertical direction along one side of the shelf body pinion gear; and
A second rack installed on the drive shaft of the second drive motor, inserted through a second through hole formed in the vertical bent surface, and extended in the vertical direction while facing the first rack gear along one side of the shelf body It includes a; a second pinion gear that is engaged with the gear and installed,
The frame fastening part,
a first support formed in a cylindrical shape bent to correspond to the curvature of the arcuate support frame, installed on an outer surface of the vertical bent surface, and into which an upper portion of the arcuate support frame is inserted; a second support installed under the arcuate support plate and having a support through-hole penetrating in the longitudinal direction corresponding to the shape of the arcuate support frame so that the arcuate support frame can be seated; a third support formed in a cylindrical shape bent to correspond to the curvature of the arcuate support frame, installed above a horizontal bent surface formed by bending the other end of the arcuate support plate, and into which a lower portion of the arcuate support frame is inserted; and an elastic support spring installed inside the first support to support the upper side of the arcuate support frame inserted into the first support by using an elastic force,
The arcuate support frame,
The lower side is exposed to the lower side of the horizontal curved surface and is installed on the bottom surface, and the upper part is gradually inserted into the inside of the first support as the arcuate support plate descends. delete delete

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