An air purification device

Abstract

The present application belongs to the technical field of air purification, and particularly relates to an air purification device, which comprises a purification main body and a filter core; the purification main body is in a cylindrical shape, is provided with an air inlet on a circumferential surface, and is provided with an air outlet on an end surface; the purification main body is used for facilitating the circulation of air from the air inlet to the air outlet; the filter core is in a circular ring shape, is installed in the purification main body, is located between the air inlet and the air outlet, and is used for filtering the air inlet. The purification main body is in a cylindrical shape, the air inlet is arranged on the circumferential surface, and the air outlet is arranged on the end surface; air is inhaled from the side and discharged from the axis, which can be applied to a narrow space, has high filtering efficiency, low air resistance, and will not cause secondary pollution of the air outlet. Moreover, the filter core is located between the air inlet and the air outlet, the air is filtered by the filter core after entering the air inlet, which can avoid the pollution of sundries in the air to the electrical devices in the purification main body, thereby improving the service life.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of air purification, and in particular, relates to an air purification device. BACKGROUND

[0002] An air purifier refers to a product capable of adsorbing, decomposing or converting various air pollutants (such as PM2.5, dust, pollen, odor, formaldehyde, bacteria, etc.) and effectively improving air cleanliness. The air flow mode of the existing air purifier is generally divided into two types: the first type is one end air inlet and the other end air outlet, which is suitable for being installed on a wall with a through hole to provide air purification for multiple rooms; the second type is one end air inlet and lateral air outlet, which provides air purification for a single room or a single small space (such as a single workstation).

[0003] When purifying air in a small space, the one end air inlet and lateral air outlet mode has the following problems: first, if the air purifier is installed on a wall or a ceiling, it is easy to blow dust when air is discharged, which affects the air purification quality; second, when air flows in the air purifier, it first passes through electrical devices such as a fan, and then is purified and discharged, which greatly reduces the service life of the air purifier; third, the device occupies a large space and is difficult to arrange in a small space. SUMMARY

[0004] The present application provides an air purification device, which can solve the technical problems of poor purification quality, short service life and difficulty in arranging in a small space of the air purifier in the prior art.

[0005] In order to solve the above problems, the present application provides an air purification device, and the technical scheme is as follows:

[0006] An air purification device, comprising a purification main body and a filter element; the purification main body is cylindrical, provided with an air inlet on the circumferential surface and an air outlet on one end surface, and is used to promote the flow of air from the air inlet to the air outlet; the filter element is annular, installed in the purification main body and located between the air inlet and the air outlet, and used to filter the air inlet.

[0007] The air purification device as described above is further preferably provided with a battery module, which is installed in the purification main body and located on the end surface where the air outlet is, and is used to supply power to the purification main body.

[0008] The air purification device as described above is further preferably provided with a plurality of battery modules, which are arranged in a circumferential array around the air outlet.

[0009] The air purification device as described above is further preferably provided with a charging port on the purification main body, which is connected with the battery module.

[0010] The air purification device as described above is further preferably provided with an axis of the filter core coinciding with an axis of the purification main body; a plurality of air inlets are arranged in a circumferential array on a circumferential surface of the purification main body; and a plurality of air outlets are arranged in a circumferential array on an end surface of the purification main body with the axis of the purification main body as the center.

[0011] The air purification device as described above is further preferably provided with an axis of the filter core coinciding with an axis of the purification main body; a plurality of air inlets are arranged in a circumferential array on a circumferential surface of the purification main body; and a plurality of air outlets are arranged in a circumferential array on an end surface of the purification main body with the axis of the purification main body as the center.

[0012] The air purification device as described above is further preferably provided with a central angle of the air inlet region ranging from 45° to 90°.

[0013] The air purification device as described above is further preferably provided with a plurality of air inlet regions arranged at equal intervals on a circumferential surface of the purification main body.

[0014] The air purification device as described above is further preferably provided with a rotating frame, which is arranged in pairs, connected with both ends of the filter core through clamping connection, and connected with the purification main body, for rotating the filter core on the purification main body.

[0015] The air purification device as described above is further preferably provided with a rotating frame, which is arranged in pairs, connected with both ends of the filter core through clamping connection, and connected with the purification main body, for rotating the filter core on the purification main body.

[0016] The air purification device as described above is further preferably provided with an adjusting assembly, which is installed on an end surface where the air outlet is located, and includes an adjusting knob, a connecting shaft and an adjusting gear; one end of the connecting shaft is connected with the adjusting knob, and the other end is connected with the adjusting gear; and an inner circumferential surface of the second clamping ring is provided with a matching tooth surface, and the adjusting gear is engaged with the matching tooth surface.

[0017] The air purification device as described above is further preferably that the rotation angle of the second snap ring is the same as the central angle of the air inlet area when the adjusting knob rotates 360 degrees.

[0018] The air purification device as described above is further preferably that it further comprises an error-proof device, the error-proof device comprising a ratchet wheel and a pawl; the ratchet wheel is installed on the connecting shaft, the axis of the ratchet wheel coincides with the axis of the connecting shaft, and the pawl is installed on the end face where the air outlet is located and cooperates with the ratchet wheel to enable the adjusting knob to rotate in one direction.

[0019] The air purification device as described above is further preferably that, along the radial direction of the filter core from outside to inside, the filter core comprises an initial filter screen, an aldehyde removal framework layer, an activated carbon layer, and a HEPA layer arranged in sequence.

[0020] The air purification device as described above is further preferably that the purification main body comprises a shell, a controller, a WiFi module, a detector, a motor, and a fan blade; the motor, the WiFi module, the detector, and the controller are all installed on the shell and located on the inner side of the filter core; the fan blade is installed on the motor, and the controller is connected to the motor, the WiFi module, and the detector respectively; the detector is located at the air outlet and is used to detect the air quality of the air outlet.

[0021] The air purification device as described above is further preferably that the air inlet and the air outlet are both located on the shell, and the shell is further provided with a surrounding ring belt, the surrounding ring belt is located on the inner side of the filter core and is used to limit the airflow direction in the shell; the axis of the surrounding ring belt coincides with the axis of the filter core, and the surrounding ring belt is provided with a notch corresponding to the air inlet area.

[0022] The air purification device as described above is further preferably that the central angle of the notch is greater than the central angle of the air inlet area.

[0023] The air purification device as described above is further preferably that it further comprises a mounting bracket, the mounting bracket is installed on the purification main body and located on the end face of the purification main body away from the air outlet; the mounting bracket comprises a clamping piece, a connecting body, and a fixing block; the clamping piece is installed on the purification main body and used to be clamped and connected with the connecting body; the connecting body is provided with a clamping sliding groove and a mounting hole, the clamping sliding groove has an open end and is used to insert and clamp the clamping piece, and the mounting hole is used to mount a bolt; the fixing block comprises a fixing piece and a fixing bolt mounted on the fixing piece, the fixing piece is used to fix the clamping piece along the clamping sliding groove, and the fixing bolt is used to fix the fixing piece to the connecting body.

[0024] Compared with the prior art, the air purification device has the advantages and beneficial effects that:

[0025] The purification main body is in a cylindrical shape, the air inlet is arranged on the circumferential surface, and the air outlet is arranged on the end surface, air is inhaled from the side and discharged from the shaft, which can be applied to narrow space, has high filtering efficiency, low air resistance, and the discharged air will not cause secondary pollution. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 The air purification device of the present application is shown in the structure diagram Figure 1 ;

[0027] Figure 2 The air purification device of the present application is shown in the structure diagram Figure 2 ;

[0028] Figure 3 The connection diagram of the adjusting assembly and the rotating frame of the present application is shown in the structure diagram

[0029] Figure 4 The installation diagram of the adjusting assembly and the error-proof device of the present application is shown in the structure diagram.

[0030] In the figure: 1 - shell; 2 - networking key; 3 - indicator light; 4 - air outlet; 5 - adjusting knob; 6 - air inlet; 7 - display module; 8 - connecting body; 9 - clamping piece; 10 - fixed block; 11 - filter core; 12 - rotating frame; 13 - pawl; 14 - adjusting gear; 15 - fence ring belt; 16 - ratchet wheel. DETAILED DESCRIPTION

[0031] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the protection scope of the present application.

[0032] In the description of the present application, the terms "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom" and the like indicate the orientation or positional relationship shown in the drawings, which are only for the convenience of describing the present application and are not required to be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. The terms "connected", "connected" used in the present application should be understood broadly, for example, it can be fixed connection or detachable connection; it can be directly connected or indirectly connected through intermediate components, and the specific meaning of the above terms can be understood by those skilled in the art according to the specific circumstances.

[0033] Please refer to Figures 1 to 4 , wherein, Figure 1 is a structural diagram of the air purification device of the present application Figure 1 ; Figure 2 is a structural diagram of the air purification device of the present application Figure 2 ; Figure 3 is a schematic diagram of the connection between the adjusting assembly and the rotating frame of the present application; Figure 4 is a schematic diagram of the installation of the error-proof device and the adjusting assembly of the present application.

[0034] As Figure 1 shown, in one embodiment of the present application, an air purification device is provided. Specifically, the air purification device comprises a purification main body and a filter element 11. The purification main body is cylindrical, and is provided with an air inlet 6 on the circumferential surface and an air outlet 4 on one end surface; the filter element 11 is annular, and is installed in the purification main body between the air inlet 6 and the air outlet 4. In use, the purification main body causes air to flow from the air inlet 6 to the air outlet 4; the filter element 11 filters the air entering the air inlet 6.

[0035] In this embodiment, the purification main body is cylindrical, the air inlet 6 is provided on the circumferential surface, and the air outlet 4 is provided on the end surface. In use, the air enters from the side and exits from the axis, which can be flexibly arranged by wall hanging, ceiling mounting and other methods, and is suitable for narrow spaces (such as bathrooms), minimizes the occupation of indoor space, has high filtering efficiency and low air resistance, and the outlet air does not cause secondary pollution (for example, when installed on the wall surface, the outlet air direction is perpendicular to the wall surface, and the outlet air does not blow the dust on the wall surface; when installed on the ceiling, the outlet air direction is perpendicular to the ceiling, and the outlet air does not blow the dust on the ceiling). And the filter element 11 is located between the air inlet 6 and the air outlet 4, so that the air entering the air inlet 6 is filtered by the filter element 11, which can avoid the pollution of the electric devices in the purification main body by the impurities in the air, thereby improving the service life.

[0036] As Figure 1As shown, in one embodiment of the present invention, a battery module is also included. The battery module is installed inside the purification body and can power the purification body, thereby enriching the application scenarios of the air purification device and making it suitable for environments without external power supply. It can maintain purification capability for a certain period of time in scenarios without external power supply. Preferably, the battery module is located on the end face where the air outlet 4 is located. During use, the purification body can dissipate heat for the battery module, thereby extending the usage time.

[0037] Furthermore, in this embodiment, there are multiple battery modules, which are arranged in a circular array around the air outlet 4, thus saving space and facilitating heat dissipation.

[0038] Furthermore, in this embodiment, the purification unit is equipped with a charging port, which is connected to the battery module. During use, the battery module can be charged via the charging port, or it can be powered by an external power source. The charging port is preferably a Type-C interface.

[0039] In the gas flow configuration of the lateral air intake and axial air exhaust of the present invention, various implementation schemes can be provided. For example, the entire circumferential surface can be designed for air intake, or a portion of the circumferential surface can be designed for air intake. Multiple air outlets 4 are designed, arranged in a circumferential array on the end face of the purification body with the axis of the purification body as the center, which can disperse the airflow and make the airflow gentler.

[0040] In one embodiment of the present invention, the axis of the filter element 11 coincides with the axis of the purification body. There are multiple air inlets 6, which are arranged in a circular array on the circumferential surface of the purification body. The filter element 11 filters air throughout its entire annular area, making it suitable for high-airflow scenarios.

[0041] like Figure 1 As shown, in one embodiment of the present invention, the axis of the filter element 11 coincides with the axis of the purification body. There are multiple air inlets 6, which are evenly distributed at intervals within the air intake area on the circumferential surface of the purification body. The air intake area is a portion of the circumferential surface. When the filter element 11 is in operation, it only performs filtration on the portion corresponding to the air intake area, making it suitable for low-airflow scenarios. Furthermore, by adjusting the usage position of the filter element 11, its service life can be extended, reducing the frequency of filter element 11 replacement.

[0042] Further, in the embodiment, the central angle of the air inlet area is 45° to 90°, for example, 45°, 50°, 55°, 60°, 65°, 70°, 75°, 80°, 85°, 90°, or any intermediate value between any two of the above-mentioned values. Preferably, the central angle of the air inlet area is 45°, 60° or 90°, which is convenient for adjusting the filter element 11. In the embodiment, the air inlet area can be one or multiple, and when the air inlet area is multiple, the multiple air inlet areas are preferably distributed at equal intervals on the circumferential surface of the purification body, which can increase the air flow and improve the purification efficiency.

[0043] As shown in Figure 3 When using a part of the circumferential surface (air inlet area) to intake air, in order to facilitate the adjustment of the use state of the filter element 11, the embodiment of the present application further comprises a rotating frame 12. The rotating frame 12 is arranged in pairs and is connected to the two ends of the filter element 11 by clamping and is connected to the purification body, which can rotate the filter element 11 on the purification body when adjusting the use state of the filter element 11. Specifically, the rotating frame 12 comprises a first clamping ring, a second clamping ring and a ball. The first clamping ring is located outside the second clamping ring, the axis of the first clamping ring coincides with the axis of the second clamping ring, and the ball is located between the first clamping ring and the second clamping ring (both the first clamping ring and the second clamping ring are provided with a groove for accommodating the ball, and the ball is located in the groove, so that the first clamping ring and the second clamping ring can rotate relative to each other). The first clamping ring is provided with a first clamping groove for clamping connection with the purification body; the second clamping ring is provided with a second clamping groove for clamping connection with the filter element 11, so that the filter element 11 can rotate relative to the purification body along the axis of the purification body, thereby adjusting the use position of the filter element 11.

[0044] Further, in the embodiment, an adjusting assembly is further included, which is installed on the end face where the air outlet 4 is located, and specifically comprises an adjusting knob 5, a connecting shaft and an adjusting gear 14. The connecting shaft is connected to the adjusting knob 5 at one end and connected to the adjusting gear 14 at the other end. The inner circumferential surface of the second clamping ring is provided with a matching tooth surface, and the adjusting gear 14 is engaged with the matching tooth surface. When it is necessary to adjust the use position of the filter element 11, the adjusting knob 5 can drive the second clamping ring to rotate through the adjusting gear 14, thereby promoting the rotation of the filter element 11, so as to adjust the use position of the filter element 11. Preferably, when the adjusting knob 5 rotates 360°, the rotation angle of the second clamping ring is the same as the central angle of the air inlet area, that is, when the adjusting knob 5 rotates one circle, it can exactly make the filter element 11 replace a brand new position for filtering air, and will not cause any waste to the filter element 11 in the circumferential direction. In order to facilitate use, the adjusting knob 5 and the purification body are both provided with an indicating arrow, and when the two indicating arrows are aligned, it is the use state, and the two indicating arrows can be aligned by twisting the adjusting knob 5 one circle each time.

[0045] Furthermore, such as Figure 4 As shown, this embodiment also includes a mistake-proofing device, which includes a ratchet 16 and a pawl 13. Specifically, the ratchet 16 is mounted on the connecting shaft, and the axis of the ratchet 16 coincides with the axis of the connecting shaft, allowing it to rotate with the connecting shaft. The pawl 13 is mounted on the end face where the air outlet 4 is located, and cooperates with the ratchet 16 to ensure that the adjusting knob 5 rotates in one direction only. When adjusting the usage part of the filter element 11, the adjusting knob 5 can rotate when turned in one direction, but cannot rotate when turned in the opposite direction, thus achieving a mistake-proofing effect and avoiding errors during adjustment.

[0046] To ensure the filtration quality of filter element 11, in one embodiment of the present invention, filter element 11 includes, sequentially arranged from the outside to the inside along its radial direction: a pre-filter, a formaldehyde removal framework layer, an activated carbon layer, and a HEPA (High Efficiency Particulate Air Filter) layer. After air enters through the air inlet 6, it first passes through the pre-filter to remove large particulate matter, such as large dust particles and lint. Then, it passes through the formaldehyde removal framework layer to adsorb formaldehyde, followed by adsorption of pollutants again through the activated carbon layer, and finally adsorption of bacteria and other contaminants through the HEPA layer. This embodiment utilizes a multi-stage purification module for composite filtration, resulting in low air resistance and high purification efficiency.

[0047] like Figure 1 As shown, in one embodiment of the present invention, the purification body includes a housing 1, a controller, a WiFi module, a detector, a motor, and fan blades. The motor, WiFi module, detector, and controller are all mounted on the housing 1 and located inside the filter element 11, contacting only the filtered air. The fan blades are mounted on the motor and rotate under its drive, causing air to enter through the air inlet 6 and exit through the air outlet 4. The controller is connected to the motor, WiFi module, and detector respectively, providing operational control; the WiFi module can connect to the network under the control of the controller. The detector is located at the air outlet 4 and is used to detect the quality of the air exiting the outlet 4, providing a reference for the adjustment and replacement of the filter element 11.

[0048] Furthermore, in this embodiment, the housing 1 is also equipped with control keys, indicator lights 3, and a display module 7, which are respectively connected to the controller. The display module 7 can be used to display the operating status of the purification unit, the indicator lights 3 can be used to display the power-on and network connection status of the purification unit, and the control keys can be used to adjust the operating status of the purification unit. Specifically, the control keys include a network connection key 2, a confirmation key, an up key, a down key, and a power key. In use, the power key is used to control the power on and off, the up and down keys are used for parameter adjustment, and the confirmation key is used to confirm the current setting. After power-on, the indicator light 3 is constantly lit. When configuring the network, pressing the network connection key 2 will cause the indicator light 3 to flash rapidly (twice per second). After the network configuration is completed, it will return to constant light.

[0049] like Figure 4 As shown, in one embodiment of the present invention, both the air inlet 6 and the air outlet 4 are located on the housing 1, and the housing 1 is also provided with a baffle ring 15. Specifically, the baffle ring 15 is located inside the filter element 11 and is used to restrict the airflow direction within the housing 1. The axis of the baffle ring 15 coincides with the axis of the filter element 11, and the baffle ring 15 has a notch corresponding to the air intake area, ensuring that the fan blades draw air only from the air intake area. Preferably, the central angle of the notch is greater than the central angle of the air intake area, which can prevent the formation of vortices between the air intake area and the baffle ring 15.

[0050] like Figure 2 Figure 2 As shown, in one embodiment of the present invention, a mounting bracket is also included. The mounting bracket is installed on the purification body and located on the end face of the purification body opposite to the air outlet 4, used to fix the purification body in the installation position. Specifically, the mounting bracket includes a snap-fit ​​piece 9, a connecting body 8, and a fixing block 10. The snap-fit ​​piece 9 is installed on the purification body and can snap into the connecting body 8 during use. The connecting body 8 has a snap-fit ​​groove and a mounting hole. One end of the snap-fit ​​groove is open, allowing the snap-fit ​​piece 9 to be inserted and snapped into the groove during use. The mounting hole is used to install bolts, such as expansion bolts, to fix the connecting body 8 in the use position. The fixing block 10 includes a fixing piece and a fastening bolt installed on the fixing piece. During use, the fixing piece can fix the snap-fit ​​piece 9 along the snap-fit ​​groove, sealing the opening of the groove, while the fastening bolt can fix the fixing piece to the connecting body 8. In this embodiment, the purification body is installed using a mounting bracket, which facilitates the assembly and disassembly of the purification body and ensures a secure and reliable installation.

[0051] As is known from common technical knowledge, this invention can be implemented through other embodiments that do not depart from its spirit or essential characteristics. Therefore, the disclosed embodiments described above are merely illustrative in all respects and are not the only ones. All modifications within the scope of this invention or equivalent to the scope of this invention are included in this invention.

Claims

1. An air purification device, characterized in that, include: The purification unit, rotating frame, adjustment components, and filter element; The purification body is cylindrical, with an air inlet on the circumferential surface and an air outlet on one end face. The purification body is used to facilitate the flow of air from the air inlet to the air outlet. The filter element is ring-shaped and installed inside the purification body, located between the air inlet and the air outlet, for filtering the air entering through the air inlet; The rotating frames are arranged in pairs, snapped together at both ends of the filter element, and respectively connected to the purification body, for the purpose of making the filter element rotate on the purification body; The rotating frame includes a first retaining ring, a second retaining ring, and a ball bearing. The first retaining ring is located outside the second retaining ring, and the axis of the first retaining ring coincides with the axis of the second retaining ring. The ball bearing is located between the first retaining ring and the second retaining ring. The first retaining ring is provided with a first retaining groove for engaging with the purification body; The second retaining ring is provided with a second retaining groove for engaging with the filter element; The adjustment assembly is installed on the end face where the air outlet is located, and includes an adjustment knob, a connecting shaft, and an adjustment gear; One end of the connecting shaft is connected to the adjusting knob, and the other end is connected to the adjusting gear; The inner circumferential surface of the second retaining ring is provided with a mating tooth surface, and the adjusting gear meshes with the mating tooth surface; The purification unit includes a housing, a controller, a WiFi module, a detector, a motor, and fan blades; The motor, the WiFi module, the detector, and the controller are all mounted on the housing and located inside the filter element. The fan blades are mounted on the motor, and the controller is connected to the motor, the WiFi module, and the detector respectively. The detector is located at the air outlet and is used to detect the quality of the air coming out of the air outlet.

2. The air purification device according to claim 1, characterized in that: It also includes a battery module, which is installed inside the purification unit and located on the end face where the air outlet is located, and is used to power the purification unit. The battery modules are multiple, and the multiple battery modules are arranged in a circular array around the air outlet; The purification unit is equipped with a charging port, which is connected to the battery module.

3. The air purification device according to claim 1, characterized in that: The axis of the filter element coincides with the axis of the purification body; The air inlets are multiple, and the multiple air inlets are distributed in a circumferential array on the circumferential surface of the purification body; The air outlets are multiple, and the multiple air outlets are arranged in a circular array on the end face of the purification body with the axis of the purification body as the center.

4. The air purification device according to claim 1, characterized in that: The axis of the filter element coincides with the axis of the purification body; The air inlets are multiple, and the multiple air inlets are equally spaced on the air intake area of ​​the circumferential surface of the purification body; The central angle of the air intake area ranges from 45° to 90°. The air outlets are multiple, and the multiple air outlets are arranged in a circular array on the end face of the purification body with the axis of the purification body as the center.

5. The air purification device according to claim 4, characterized in that: When the adjustment knob is rotated 360°, the rotation angle of the second retaining ring is the same as the central angle of the air intake area.

6. The air purification device according to claim 5, characterized in that: It also includes a mistake-proofing device, which includes a ratchet and a pawl; The ratchet is mounted on the connecting shaft, and the axis of the ratchet coincides with the axis of the connecting shaft. The pawl is mounted on the end face where the air outlet is located and cooperates with the ratchet to make the adjustment knob rotate in one direction.

7. The air purification device according to claim 4, characterized in that: Along the radial direction of the filter element from the outside to the inside, the filter element includes a pre-filter, a formaldehyde removal skeleton layer, an activated carbon layer, and a HEPA layer arranged in sequence.

8. The air purification device according to claim 7, characterized in that: Both the air inlet and the air outlet are located on the housing. The housing is also provided with a baffle ring, which is located inside the filter element and is used to restrict the airflow direction inside the housing. The axis of the enclosure ring coincides with the axis of the filter element. The enclosure ring has a notch, which corresponds to the air intake area, and the central angle of the notch is greater than that of the air intake area.

9. The air purification device according to claim 1, characterized in that: It also includes a mounting bracket, which is mounted on the purification body and located on the end face of the purification body opposite to the air outlet; The mounting bracket includes a snap-fit ​​tab, a connector, and a fixing block; The snap-fit ​​tab is installed on the purification body and is used to snap-fit ​​and connect with the connector. The connector is provided with a snap-fit ​​groove and a mounting hole. One end of the snap-fit ​​groove is open for inserting and snapping the snap-fit ​​piece, and the mounting hole is used for installing bolts. The fixing block includes a fixing plate and a fastening bolt mounted on the fixing plate. The fixing plate is used to fix the snap-fit ​​piece along the snap-fit ​​groove, and the fastening bolt is used to fix the fixing plate to the connecting body.

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