Balanced sealed liquid tank type air filter and laminar flow structure

Abstract

The utility model discloses a balanced sealing liquid groove type air filter and a laminar flow structure. The balanced sealing liquid groove type air filter is characterized in that a frame is provided with an air filter element, the top of the frame is provided with a first liquid sealing groove, the periphery of the frame is surrounded by a sealing side plate, and the bottom of the frame is provided with a bottom plate; the mounting assembly comprises a positioning seat, a lifting column, a translation rod and a lifting screw, a longitudinal channel and a transverse channel which are vertically communicated are formed in the positioning seat, the lifting column is slidably connected into the longitudinal channel, a lifting screw hole is formed in the bottom of the lifting column, the lifting screw is in threaded connection with the lifting screw hole, and the translation rod is slidably connected into the transverse channel; a first wedge structure is arranged at the top of the lifting column, and a second wedge structure is arranged at one end of the translation rod; the face frame is detachably connected to the lower portion of the bottom plate, a second liquid seal groove is formed in the face frame, and the sealing side plate is inserted into the second liquid seal groove. The filter is comprehensive and reliable in sealing effect, stable and reliable in filtering and purifying effect, stable and firm in overall structure and convenient to install and operate.

Description

Technical Field

[0001] This utility model relates to the field of air filtration, and in particular to a balanced and sealed liquid tank air filter and laminar flow structure. Background Technology

[0002] An air filter is a device that uses porous filter materials to capture dust from a gas-solid two-phase flow and purify the gas. It is widely used in high-purity fields such as electronics manufacturing and biomedicine. For example, air filters are a core component of laminar flow ceiling systems.

[0003] In existing technologies, when applied to laminar flow ceiling systems, air filters are installed and applied through fixed sealing or movable sealing. Fixed sealing has high maintenance costs and high replacement costs for the filter structure. Movable sealing air filters usually use a single liquid tank structure to connect to the ceiling, but this structure has poor sealing performance. Once vibration occurs during operation, unfiltered air is easily leaked, resulting in unstable air filtration performance. Utility Model Content

[0004] This invention aims to solve at least one of the technical problems existing in the prior art. To this end, this invention proposes a balanced, sealed liquid-sink type air filter and laminar flow structure, which provides comprehensive and stable sealing, convenient maintenance, and excellent air filtration and purification effects.

[0005] A balanced-sealed liquid-tank air filter according to a first aspect embodiment of the present invention includes:

[0006] The frame is equipped with an air filter element, the top of the frame is equipped with a first liquid seal groove, the frame is surrounded by a sealing plate, the bottom of the frame is equipped with a bottom plate, and the bottom plate is equipped with a through hole.

[0007] The mounting components include at least two components symmetrical about the frame center. The mounting components include a positioning seat, a lifting column, a translation rod, and a lifting screw. The positioning seat is connected to the outside of the frame and has a vertically connected longitudinal channel and a transverse channel. The bottom end of the longitudinal channel is connected to a through hole. The lifting screw is rotatably connected to the through hole. The lifting column is slidably connected to the longitudinal channel. The bottom of the lifting column has a lifting screw hole, and the lifting screw is threadedly connected to the lifting screw hole. The translation rod is slidably connected to the transverse channel and is used to connect to an external laminar flow support. The top of the lifting column has a first wedge structure, and one end of the translation rod has a second wedge structure. The first wedge structure and the second wedge structure are slidably connected.

[0008] The face frame is detachably connected to the bottom plate. The face frame is provided with a second liquid seal groove around the frame, and the sealing side plate is inserted into the second liquid seal groove.

[0009] In this embodiment, the sealing plate includes a horizontal plate and a vertical plate that are both arranged in a frame shape. The inner side of the horizontal plate is connected to the frame, the top of the vertical plate is connected to the outer side of the horizontal plate, and the bottom of the vertical plate is inserted into the second liquid seal groove.

[0010] In this embodiment, the base plate is also provided with a first positioning screw hole, the face frame is provided with a positioning plate, the positioning plate is provided with a second positioning screw hole, and positioning screws are threadedly connected to the first positioning screw hole and the second positioning screw hole.

[0011] In this embodiment, the bottom of the base plate is provided with a slot that matches the positioning plate, and the positioning plate is engaged in the slot.

[0012] In this embodiment, four sets of first positioning screw holes, positioning plates, and locking slots are provided.

[0013] In this embodiment, the first wedge structure is a slider with a T-shaped cross-section, and the extension direction of the slider forms an acute angle with the horizontal plane. The second wedge structure is a groove with a T-shaped cross-section, and the extension direction of the groove is the same as the extension direction of the groove.

[0014] In this embodiment, the mounting components are provided in four groups and are evenly distributed on opposite sides of the frame.

[0015] According to a second aspect embodiment of the present invention, a laminar flow structure includes a balanced sealed liquid-seal air filter according to any of the first aspects embodiments, and further includes a ventilation duct and a ceiling body. The bottom of the ventilation duct is inserted into a first liquid seal groove, and the ceiling body is provided with a sealing frame, the bottom of which is inserted into a second liquid seal groove.

[0016] In this embodiment, the opening of the first liquid seal tank is provided with a first snap-fit ​​component, and the bottom of the ventilation duct is provided with a second snap-fit ​​component, which is connected to the first snap-fit ​​component.

[0017] The embodiments of this utility model have at least the following beneficial effects:

[0018] By sealing different connection areas with two liquid seal tanks, a double sealing barrier is formed, ensuring a comprehensive and reliable sealing effect. This effectively prevents the leakage of unfiltered air, resulting in stable and reliable air filtration and purification. The faceplate can be quickly removed from the base plate, facilitating easy replacement and maintenance of the liquid sealant in the second liquid seal tank. This process is efficient, cost-effective, and maintains the effectiveness of the liquid sealant in the second liquid seal tank. Its strong dynamic adaptability further enhances the sealing effect of the air filter during application, improving the reliability of air filtration and purification and extending its service life. The mounting components allow for positioning between the frame and the laminar flow support, separating different structures for sealing and positioning installation. This effectively reduces the workload of each structure, provides high tolerance for unexpected situations during application, ensures reliable air filtration and purification, and maintains a stable and robust overall structure. The horizontal movement of the translation rod can be achieved by adjusting the lifting screw, making installation convenient and maintenance cost-effective. Attached Figure Description

[0019] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0020] Figure 1 This is a three-dimensional structural diagram of a balanced-sealed liquid-tank air filter according to a first aspect embodiment of the present invention.

[0021] Figure 2 This is a three-dimensional structural diagram of the balanced sealed liquid tank air filter according to the first aspect of the present invention from another perspective.

[0022] Figure 3 This is an exploded structural diagram of a balanced-sealed liquid-tank air filter according to a first aspect embodiment of the present invention.

[0023] Figure 4 This is a three-dimensional structural diagram of the laminar flow structure according to the second aspect of the present invention;

[0024] Figure 5 This is a top view of the laminar flow structure according to the second aspect of the present invention;

[0025] Figure 6 For along Figure 5 A schematic diagram of the cross-sectional structure of line A-A';

[0026] Figure 7 for Figure 6 A magnified structural diagram of C;

[0027] Figure 8 For along Figure 5 A schematic diagram of the cross-sectional structure of B-B';

[0028] Figure 9 for Figure 8 A magnified structural diagram of D in the diagram.

[0029] Figure label:

[0030] Frame 100, air filter element 110, first liquid seal groove 120, first snap-fit ​​part 121, sealing side plate 130, horizontal plate 131, vertical plate 132, bottom plate 140, through hole 141, first positioning screw hole 142, and snap-fit ​​groove 143;

[0031] Mounting components 200, positioning seat 210, longitudinal channel 211, transverse channel 212, lifting column 220, lifting screw hole 221, first wedge structure 222, translation rod 230, second wedge structure 231, lifting screw 240;

[0032] Face frame 300, second liquid seal groove 310, positioning plate 320, second positioning screw hole 321, positioning screw 330;

[0033] Ventilation duct 400, second clamp connector 410;

[0034] Ceiling body 500, sealing frame 510. Detailed Implementation

[0035] The embodiments of this utility model are described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0036] In the description of this utility model, it should be understood that the orientation descriptions, such as up, down, left, right, front, and back, are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0037] In the description of this utility model, if the wire sleeve or bracket is mentioned, it is only for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated or the order of the technical features indicated.

[0038] In the description of this utility model, unless otherwise explicitly defined, terms such as "setting," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model in conjunction with the specific content of the technical solution.

[0039] Air filters are devices that use porous filter materials to capture dust from gas-solid two-phase flows, thus purifying the gas. They are widely used in high-cleanliness fields such as electronics manufacturing and biomedicine; for example, air filters are a core component of laminar flow ceiling systems. In existing technologies, when applied to laminar flow ceiling systems, air filters are installed using either fixed or movable seals. Fixed seals have high maintenance and filter replacement costs.

[0040] Air filters with movable seals typically use a single-liquid-tank structure to connect to the ceiling, facilitating replacement and maintenance. However, this single-structure design suffers from poor sealing, making them prone to leaks of unfiltered air during operation, leading to unstable filtration and substandard air purification. Existing air filters with single-liquid-tanks for ceiling-mounted connections also suffer from high workloads, are prone to damage, and have short lifespans. Therefore, there is an urgent need for an air filter that can evenly distribute the workload across different areas, improve structural stability, extend service life, and simplify maintenance.

[0041] The following is for reference only. Figure 1 To be continued Figure 9 This invention describes a balanced-sealed liquid-sink type air filter and laminar flow structure, which provides a comprehensive and stable sealing effect, is easy to maintain, and has a good air filtration and purification effect.

[0042] Reference Figures 1 to 3 A balanced-sealed liquid-tank air filter according to a first aspect embodiment of the present invention includes:

[0043] The frame 100 is equipped with an air filter element 110. The frame 100 is generally made of aluminum, which is lightweight and stable. The air filter element 110 divides the interior of the frame 100 into upper and lower spaces along the horizontal direction. The air filter element 110 can be a HEPA filter element. The top of the frame 100 is provided with a first liquid seal groove 120, which stores liquid sealant. The first liquid seal groove 120 is used for connection of the ventilation duct 400 in the ceiling. Liquid sealant, also known as liquid sealant, has the characteristics of high filtration efficiency, low resistance, and large dust holding capacity. After curing, the liquid sealant is an elastic colloid. When the entity connected by the liquid sealant can be easily separated, the liquid sealant regains its elasticity. When the entity is inserted into the liquid sealant, the liquid sealant can automatically restore the sealing effect. The frame 100 is surrounded by a sealing side plate 130, and the bottom of the frame 100 is provided with a bottom plate 140, which has a through hole 141.

[0044] Mounting components 200, at least two in number, are provided and are symmetrical about the center of the frame 100. Each mounting component 200 includes a positioning seat 210, a lifting column 220, a translation rod 230, and a lifting screw 240. The positioning seat 210 is connected to the outside of the frame 100 and has a vertically connected longitudinal channel 211 and a transverse channel 212. One end of the transverse channel 212 is connected to one side of the longitudinal channel 211, and the other end of the transverse channel 212 is connected to the external environment. The longitudinal channel 211 is perpendicular to the frame 100. The horizontal channel 212 is parallel to the horizontal plane, and the bottom end of the vertical channel 211 is connected to the through hole 141. The lifting screw 240 is rotatably connected to the through hole 141. Preferably, the lifting screw 240 is rotatably connected to the base plate 140 through a bearing. The lifting column 220 is slidably connected in the vertical channel 211. The lifting column 220 can achieve lifting and lowering movement under the constraint of the vertical channel 211. The bottom of the lifting column 220 is provided with a lifting screw hole 221, and the lifting screw 240 is threadedly connected to the lifting screw hole 221. The screw head of screw 240 is located below the base plate 140. Tightening the lifting screw 240 drives the lifting column 220 to move up and down in the lifting channel. The translation rod 230 is slidably connected to the transverse channel 212. Under the constraint of the transverse channel 212, the translation rod 230 can move horizontally. The translation rod 230 is used to connect to the external laminar flow support. The top of the lifting column 220 is provided with a first wedge structure 222, and one end of the translation rod 230 is provided with a second wedge structure 231. The first wedge structure 222 and the second wedge structure 231... The two wedge structures 231 are slidably connected so that the translation rod 230 moves with the lifting column 220 in the horizontal direction, thereby allowing the translation rod 230 to extend or retract into the transverse channel 212. When the translation rod 230 extends out of the transverse channel 212, it can be engaged with the laminar flow bracket, thereby achieving the positioning of the frame 100. Specifically, when the lifting screw 240 is rotated, the lifting column 220 rises and falls vertically to the horizontal plane, and the wedge structure pushes the translation rod 230 to move horizontally, thereby achieving the positioning between the air filter and the applied laminar flow bracket.

[0045] The face frame 300 is detachably connected to the bottom plate 140. The face frame 300 is provided with a second liquid seal groove 310 surrounding the frame 100. The second liquid seal groove 310 stores liquid sealant. The face frame 300 is detachable to facilitate the replacement of the liquid sealant in the second liquid seal groove 310, which can effectively facilitate maintenance. The sealing side plate 130 is inserted into the liquid sealant in the second liquid seal groove 310. The second liquid seal groove 310 is also used to provide a connection and seal for the sealing frame 510 of the ceiling body 500.

[0046] The application status can be referenced Figures 4 to 9 As shown.

[0047] By sealing different connection areas with two liquid seal tanks, a double sealing barrier is formed, effectively ensuring the sealing effect even during vibration during operation. The sealing effect is comprehensive and reliable, effectively preventing the leakage of unfiltered air. The air filtration and purification effect is stable and reliable. Furthermore, the face frame 300 can be quickly removed from the base plate 140, making the replacement and maintenance of the liquid sealant in the second liquid seal tank 310 convenient, efficient, and low-cost. It effectively maintains the effectiveness of the liquid sealant in the second liquid seal tank 310, exhibiting strong dynamic adaptability. By ensuring the performance of the liquid sealant, it can effectively adapt to different working scenarios, thereby effectively maintaining the sealing effect of this air filter during application and avoiding the limitations of traditional methods. The increased operating costs resulting from replacing the entire filter in this solution effectively improve the reliability of air filtration and purification, extend its effective service life, and prevent the performance of the air filter from being affected by the deterioration or even failure of the liquid sealant. The installation component 200 enables the positioning between the frame 100 and the applied laminar flow support, separating different structures to achieve sealing isolation and positioning installation, effectively reducing the workload of each structure, providing high fault tolerance for unexpected situations during application, ensuring reliable air filtration and purification, and maintaining a stable and robust overall structure. The horizontal movement of the translation rod 230 can be achieved by adjusting the lifting screw 240, making installation and operation convenient and maintenance costs low.

[0048] It is understood that the sealing plate 130 includes a horizontal plate 131 and a vertical plate 132 that are both framed around it. The horizontal plate 131 and the vertical plate 132 can be integrally formed. The inner side of the frame of the horizontal plate 131 is connected to the frame 100, the top of the vertical plate 132 is connected to the outer side of the frame of the horizontal plate 131, and the bottom of the vertical plate 132 is inserted into the liquid sealant of the second liquid seal groove 310. The horizontal plate 131 is located above the bottom plate 140, and the vertical plate 132 is located around the bottom plate 140.

[0049] By using a horizontal plate 131 parallel to the horizontal plane to extend the vertical plate 132 outwards around the perimeter of the frame 100, it is ensured that the vertical plate 132 can be smoothly aligned and inserted into the second liquid seal groove 310. The horizontal plate 131 forms a sealing connection between the vertical plate 132 and the frame 100, effectively ensuring sealing performance during application. The width of the horizontal plate 131 can be set to 10-15 mm, effectively providing a mounting base for the vertical plate 132 and expanding the sealing coverage area.

[0050] Understandably, the base plate 140 is also provided with a first positioning screw hole 142, and the face frame 300 is provided with a positioning plate 320. The positioning plate 320 is provided with a second positioning screw hole 321. Positioning screws 330 are threadedly connected to the first positioning screw hole 142 and the second positioning screw hole 321. The screw head of the positioning screw 330 is located below the face frame 300. By turning the positioning screw 330, the face frame 300 and the base plate 140 can be locked or disassembled. The connection between the face frame 300 and the base plate 140 is achieved by the threaded connection, which can effectively facilitate disassembly and assembly operations, and the installation connection effect is stable and reliable.

[0051] Understandably, the bottom of the base plate 140 is provided with a slot 143 that matches the positioning plate 320. The first positioning screw hole 142 is located at the bottom of the slot 143. The positioning plate 320 is engaged in the slot 143, which provides good foolproof installation and convenient operation. Furthermore, the slot 143 and the positioning plate 320 can further improve the stability and reliability of the positioning effect between the base plate 140 and the face frame 300.

[0052] It is understood that there are four sets of first positioning screw holes 142, positioning plates 320 and locking grooves 143, that is, there are four first positioning screw holes 142, positioning plates 320 and locking grooves 143, and each positioning plate 320 also has four second positioning screw holes 321 and positioning screws 330. The four first positioning screw holes 142 are evenly distributed on the base plate 140, and the positions of the positioning plates 320 and locking grooves 143 correspond to the positions of the first positioning screw holes 142.

[0053] Understandably, the first wedge structure 222 is a slider with a T-shaped cross-section, and the extension direction of the slider forms an acute angle with the horizontal plane. That is, the slider extends in a T-shaped cross-section along the direction inclined to the horizontal plane. The acute angle can be set to 15° to 60°. The second wedge structure 231 is a groove with a T-shaped cross-section, and the extension direction of the groove is the same as the extension direction of the groove. That is, the groove extends in a T-shaped cross-section along the direction inclined to the horizontal plane.

[0054] Specifically, the acute angle plus the included angle is set to 30°, so that the vertical movement of the lifting column 220 can be efficiently converted into the horizontal displacement of the translation rod 230. The T-shaped slider includes a vertical neck section and a horizontal wing section, which are fixedly connected to the top of the lifting column 220 to provide structural support. The horizontal wing sections are symmetrically distributed on both sides of the neck section and form a double guide surface. The inner wall of the T-shaped slide is coated with polytetrafluoroethylene, which can effectively improve the smoothness of the movement.

[0055] It is understood that the mounting components 200 are provided in four sets, and the four sets of mounting components 200 are evenly distributed on the opposite sides of the frame 100. That is, the mounting components 200 are evenly distributed on the opposite sides of the frame 100 with two sets on each side. This simplifies the structure of the matching laminar flow bracket and simplifies the layout design. The four sets of mounting components 200 can effectively improve the stability of the air filter installed on the applied laminar flow bracket.

[0056] Reference Figures 4 to 9 A laminar flow structure according to a second aspect of the present invention includes a balanced-seal liquid-sink air filter according to any of the first aspects of the present invention, and further includes a ventilation duct 400 and a ceiling body 500. The bottom of the ventilation duct 400 is inserted into the liquid-sink adhesive of the first liquid-seal groove 120. Preferably, the insertion depth of the bottom of the ventilation duct 400 is 70% to 80% of the depth of the liquid-sink adhesive. The ceiling body 500 is provided with a sealing frame 510. The bottom of the sealing frame 510 is inserted into the liquid-sink adhesive of the second liquid-seal groove 310. Preferably, the insertion depth of the bottom of the sealing frame 510 is 70% to 80% of the depth of the liquid-sink adhesive.

[0057] It is understandable that the opening of the first liquid seal tank 120 is provided with a first snap-fit ​​121, and the bottom of the ventilation duct 400 is provided with a second snap-fit ​​410 that matches the first snap-fit ​​121. The second snap-fit ​​410 is snapped into place with the first snap-fit ​​121, which can effectively improve the stability of the relative position between the plate frame and the ventilation duct 400 when applied to a laminar flow structure.

[0058] Specifically, both the first and second locking components are locking plate structures, that is, the second locking component 410 is a knife-edge structure extending from the bottom edge of the ventilation duct 400, and the second locking component is supported by the bottom of the first locking component.

[0059] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. An isostatic sealed tank air filter, characterized by, The utility model relates to a liquid seal device for air purification, comprising: a frame (100) provided with an air filter core (110), a top of the frame (100) is provided with a first liquid seal groove (120), a periphery of the frame (100) is surrounded by a sealing side plate (130), a bottom of the frame (100) is provided with a bottom plate (140), the bottom plate (140) is provided with a through hole (141); a mounting assembly (200) provided with at least two and about the frame (100) center symmetry, the mounting assembly (200) includes a positioning seat (210), a lifting column (220), a translation rod (230) and a lifting screw (240), the positioning seat (210) is connected to the outside of the frame (100), the positioning seat (210) is provided with vertical communication longitudinal channel (211) and transverse channel (212), the bottom end of longitudinal channel (211) is communicated with the through hole (141), the lifting screw (240) is rotatably connected to the through hole (141), the lifting column (220) is slidably connected in longitudinal channel (211), the bottom of the lifting column (220) is provided with a lifting screw hole (221), the lifting screw (240) is threadedly connected to the lifting screw hole (221), the translation rod (230) is slidably connected in the transverse channel (212), the translation rod (230) is used for connecting the external laminar flow support, the top of the lifting column (220) is provided with a first inclined wedge structure (222), one end of the translation rod (230) is provided with a second inclined wedge structure (231), the first inclined wedge structure (222) is slidably connected with the second inclined wedge structure (231); a face frame (300) detachably connected to the bottom plate (140), the face frame (300) is provided with a second liquid seal groove (310) around the periphery of the frame (100), and the sealing side plate (130) is inserted into the second liquid seal groove (310).

2. An isostatic sealed tank-type air cleaner according to claim 1, wherein The sealing side plate (130) includes horizontal plates (131) and vertical plates (132) which are surrounded in a frame shape, the inner side of the horizontal plate (131) is connected to the frame (100), the top of the vertical plate (132) is connected to the outer side of the horizontal plate (131), and the bottom of the vertical plate (132) is inserted into the second liquid seal groove (310).

3. An isostatic sealed tank-type air cleaner as set forth in claim 1 wherein, The bottom plate (140) is further provided with a first positioning screw hole (142), the face frame (300) is provided with a positioning plate (320), the positioning plate (320) is provided with a second positioning screw hole (321), and the first positioning screw hole (142) and the second positioning screw hole (321) are threadedly connected with a positioning screw (330).

4. An isostatic sealed tank-type air cleaner as set forth in claim 3 wherein, The bottom of the bottom plate (140) is provided with a clamping groove (143) matched with the positioning plate (320), and the positioning plate (320) is clamped into the clamping groove (143).

5. An isostatic sealed tank-type air cleaner as set forth in claim 4 wherein, The first positioning screw hole (142), the positioning plate (320) and the clamping groove (143) are provided with four.

6. An isostatic sealed tank-type air cleaner as set forth in claim 1 wherein, The first inclined wedge structure (222) is a T-shaped slider, and an acute angle is formed between the extension direction of the slider and the horizontal plane; the second inclined wedge structure (231) is a T-shaped sliding groove, and the extension direction of the sliding groove is the same as that of the slider.

7. An isostatic sealed tank-type air cleaner as set forth in claim 1 wherein, The mounting assembly (200) is provided with four groups of mounting assemblies which are uniformly distributed on opposite sides of the frame (100).

8. A laminar flow structure, characterized by The equalized sealing liquid tank type air filter comprises a ventilation pipe (400) and a ceiling body (500), the bottom of the ventilation pipe (400) is connected to the first liquid sealing tank (120), and the ceiling body (500) is provided with a sealing frame (510), and the bottom of the sealing frame (510) is connected to the second liquid sealing tank (310).

9. A laminar flow structure according to claim 8, wherein, The slot of the first liquid sealing tank (120) is provided with a first clamping piece (121), and the bottom of the ventilation pipe (400) is provided with a second clamping piece (410), and the second clamping piece (410) is connected to the first clamping piece (121) in a clamping manner.

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