An air jet mill

Abstract

The application provides an airflow mill, which comprises a shell, a grading wheel, a discharge part, a guide disc assembly and a nozzle; the shell surrounds a cavity, the grading wheel and the guide disc assembly are arranged in the cavity, a feeding port is arranged on the shell and communicates the inside and outside of the cavity, and the feeding port is used for guiding materials into the cavity; the grading wheel, the discharge part, the guide disc assembly and the nozzle are sequentially arranged from high to low in the height direction, the feeding port is not lower than the grading wheel in the height direction, so that the materials are classified and then enter the discharge part for discharging and the space below the discharge part for crushing; the nozzle is used for spraying a main airflow to the directly upward, so that the materials are crushed after being impacted by the main airflow and guided to the grading wheel by the guide disc assembly for re-classification. The materials entering the airflow mill are classified by the grading wheel first, and then the qualified materials after classification are directly discharged from the grading wheel to the discharge part, so that the qualified particles are not crushed again, and the output rate of the qualified particles is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of powder processing, in particular to a jet mill. BACKGROUND

[0002] The jet mill is widely used in the field of powder processing, and its working principle is that compressed air is injected into a crushing chamber at high speed through a Laval nozzle after being filtered and dried. The material is repeatedly collided, rubbed and sheared at the intersection of multiple high-pressure air flows to be crushed. The crushed material moves upward with the air flow under the suction of the fan and reaches the classification area. Under the action of the strong centrifugal force generated by the high-speed rotating classification turbine, the coarse and fine materials are separated. The fine particles meeting the particle size requirements pass through the classification wheel into the cyclone separator and dust collector for collection, and the coarse particles descend to the crushing area for further crushing.

[0003] In the crushing process of the existing jet mill, the frequency of material impact is too high, which will produce fine powder. The fine powder needs to be collected by a dust collector as a byproduct, and too much fine powder will seriously affect the yield of qualified particles.

[0004] Therefore, the present application is proposed. SUMMARY

[0005] The present application provides a jet mill to solve the technical problem that the existing jet mill is easy to produce too much fine powder due to the high frequency of material impact, which affects the yield.

[0006] The present application provides a jet mill, which comprises a housing, a classification wheel, a discharge member, a guide disc assembly and a nozzle. The housing surrounds a cavity, the classification wheel and the guide disc assembly are arranged in the cavity, and a feed inlet is formed in the housing to communicate the inside and outside of the cavity. The feed inlet is used to guide the material into the cavity. The classification wheel, the discharge member, the guide disc assembly and the nozzle are arranged in sequence from high to low in the height direction. The feed inlet is not lower than the classification wheel in the height direction, so that the material is classified and then discharged by the discharge member and crushed below the discharge member. The nozzle is used to spray the main air flow upward, so that the material is crushed after being impacted by the guide disc assembly and guided to the classification wheel for reclassification.

[0007] In a further aspect of the present application, a discharge passage is formed in the discharge member, and the inlet of the discharge passage is located directly below the qualified outlet of the classification wheel. At least part of the feed inlet and the inlet of the classification wheel are located on the same horizontal plane.

[0008] In a further aspect of the present application, the housing and the nozzle surround an annular groove, and the annular groove and the nozzle are arranged with the same center. The jet mill further comprises an air inlet pipe, which communicates with the annular groove to form an auxiliary air flow from the annular groove to make the material enter the main air flow.

[0009] In a further aspect of the present application, the material guiding disc assembly comprises a disc base arranged on the discharging member, and a target material located directly above the nozzle so that the material carried by the main airflow is crushed when impacting on the target material; the target material is conical and located directly below the inlet of the discharging channel and the classification wheel so that the crushed material is guided to the classification wheel for re-classification.

[0010] In a further aspect of the present application, the material guiding disc assembly further comprises a first connecting member connecting the disc base and the discharging member, and a second connecting member connecting the target material and the discharging member and clamping the disc base between the target material and the discharging member; the disc base is provided with a through hole, and the second connecting member passes through the disc base from the through hole.

[0011] In a further aspect of the present application, the material guiding disc assembly further comprises a pressure sensor connected to the second connecting member; the target material is provided with a mounting groove, and the pressure sensor is arranged in the mounting groove; the pressure sensor is located directly below the nozzle so as to obtain the wear state of the target material according to the pressure.

[0012] In a further aspect of the present application, the second connecting member is further provided with a mounting channel penetrating the second connecting member along the axial direction of the second connecting member; the pressure sensor is clamped into the mounting channel to connect the second connecting member, and the power line of the pressure sensor passes through the second connecting member from the mounting channel.

[0013] In a further aspect of the present application, the airflow mill further comprises a driving member arranged on the shell and located outside the cavity; a power output shaft of the driving member penetrates the shell and is transmissionally connected to the classification wheel to drive the classification wheel to classify.

[0014] In a further aspect of the present application, the airflow mill further comprises a feeding pipe, a feeding valve and a blower; the feeding valve is arranged on the feeding pipe; the feeding pipe is communicated with the cavity from the feeding port; and the outlet of the blower is communicated with the feeding pipe to bring the material into the cavity from the feeding valve.

[0015] In a further aspect of the present application, the shell comprises a first shell, a second shell, and a connecting section; the feeding port, the classification wheel and the discharging member are arranged on the first shell; the second shell comprises a first mounting section, a second mounting section and the connecting section; the connecting section connects the first mounting section and the second mounting section; the first mounting section is connected to the first shell; the air inlet pipe and the nozzle are arranged on the second mounting section; and the width of the connecting section gradually increases from one side of the second mounting section to the other side of the first mounting section.

[0016] The airflow mill provided by the application is characterized in that the classification wheel, the discharge part, the material guiding disc assembly and the nozzle are sequentially arranged from high to low in the height direction, and the feeding port is arranged not lower than the classification wheel in the height direction, so that the material entering the feeding port firstly enters the classification wheel for classification, the qualified material after classification directly enters the discharge part from the classification wheel and is not crushed again, thereby reducing the yield of fine powder, effectively improving the yield of qualified particles, and the unqualified particles enter the lower part of the cavity from the classification wheel, are driven upward by the nozzle and are crushed by impacting on the material guiding disc assembly.

[0017] Other features and advantages of the embodiments of the application will be described in the following detailed description of the embodiments. BRIEF DESCRIPTION OF DRAWINGS

[0018] In order to more clearly illustrate the specific embodiments of the application or the technical solutions in the prior art, the following will briefly introduce the drawings needed to be used in the description of the specific embodiments or the prior art. Obviously, the drawings described below are some embodiments of the application, and other drawings can be obtained by those skilled in the art without creative labor on the basis of these drawings.

[0019] Figure 1 The structural schematic diagram of the airflow mill provided by one of the embodiments of the application is shown in the figure.

[0020] Figure 2 The structural schematic diagram of part of the structure of the airflow mill provided by one of the embodiments of the application is shown in the figure.

[0021] Figure 3 The structural schematic diagram of the discharge part and the material reversing assembly provided by one of the embodiments of the application is shown in the figure.

[0022] Figure 4 The sectional view of A-A in the figure. Figure 1

[0023] Figure 5 The airflow diagram of the airflow mill provided by one of the embodiments of the application is shown in the figure.

[0024] Reference signs

[0025] 100, shell; 110, second shell; 111, first mounting section; 112, second mounting section; 113, connecting section; 120, first shell; 100A, cavity; 100B, annular groove body;

[0026] 200, material guiding disc assembly; 210, disc seat; 220, target material; 230, first connecting part; 240, second connecting part; 250, pressure sensor;

[0027] 310, nozzle; 320, air inlet pipe; ​

[0028] 400, discharge member; 400A, discharge passage;

[0029] 500, grading wheel; 600, driving member; 700, feeding pipe; 800, blower; 900, feeding valve. DETAILED DESCRIPTION

[0030] In order to make the above and other features and advantages of the present application more comprehensible, the present application will be further described below with reference to the drawings. It should be understood that the specific embodiments given herein are by way of example only and are not to be construed in a limiting sense.

[0031] In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application.

[0032] In addition, the terms "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features referred to. Therefore, the features defined with "first", "second" can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "a plurality of" is at least two, for example, two, three, etc., unless otherwise specifically limited.

[0033] In the present application, unless otherwise specifically defined and limited, the terms "mounting", "connecting", "connecting", "fixing" and the like should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise specifically limited. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0034] In the present application, unless otherwise explicitly specified and limited, the first feature is "on" or "under" the second feature can be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature "above", "over" and "on" the second feature can be that the first feature is directly above or obliquely above the second feature, or just means that the first feature is higher in horizontal height than the second feature. The first feature "below", "under" and "under" the second feature can be that the first feature is directly below or obliquely below the second feature, or just means that the first feature is lower in horizontal height than the second feature.

[0035] In the description of the present application, the description of the terms "one embodiment", "some embodiments", "example", "specific example" or "some examples" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present application, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any suitable manner in any one or more embodiments or examples. In addition, the skilled in the art can combine and combine the different embodiments or examples described in the present application and the features of the different embodiments or examples without contradiction.

[0036] Please refer to Figures 1-2 The present application provides an air flow mill, comprising a shell 100, a classification wheel 500, a discharge member 400, a guide disc assembly 200 and a nozzle 310; the shell 100 surrounds a cavity 100A, the classification wheel 500 and the guide disc assembly 200 are arranged in the cavity 100A, and a feed inlet (not marked in the figure) is formed on the shell 100 to communicate the inside and outside of the cavity 100A, and the feed inlet is used to guide the material into the cavity 100A; the classification wheel 500, the discharge member 400, the guide disc assembly 200 and the nozzle 310 are sequentially arranged from high to low in the height direction, and the feed inlet is not lower than the classification wheel 500 in the height direction, so that the material is classified and then enters the discharge member 400 for discharge and is crushed below the discharge member 400; the nozzle 310 is used to spray the main airflow upward, so that the material is crushed after being impacted by the main airflow and guided by the guide disc assembly 200 to the classification wheel 500 for reclassification.

[0037] It can be understood that the classification wheel 500 provided by the present application is a commonly used material sorting device in the prior art, which realizes particle sorting through the synergistic effect of centrifugal force and fluid power, and generally includes an inlet and two outlets, one of which is a qualified outlet for qualified particles. The present application does not further elaborate its specific structure.

[0038] Regarding the height direction, please refer to Figure 2 ,Figure 2 The X in the figure represents the height direction.

[0039] Furthermore, the discharge component 400 needs to realize the discharge function of the entire air jet mill, that is, to guide qualified materials from the cavity 100A to the outside of the housing 100. Since the classifying wheel 500 has already classified the materials, it is only necessary to set the inlet of the discharge component 400 below the qualified outlet of the classifying wheel 500 to discharge qualified materials.

[0040] It should be noted that the nozzle 310, as an airflow forming component, is only suitable for forming concentrated airflow. Therefore, it is necessary to equip it with an external air source such as an air pump and an air storage tank (not shown). At the same time, the pressure of the supplied air must be controlled to ensure the impact speed of the material when it is driven by the airflow, thereby ensuring the impact force.

[0041] In summary, the air jet mill provided by this invention arranges the classifying wheel 500, the discharge component 400, the guide plate assembly 200, and the nozzle 310 in a vertical direction from high to low, and sets the feed inlet at a height not lower than the classifying wheel 500. This allows the material entering through the feed inlet to first enter the classifying wheel 500 for classification. The qualified material after classification will directly enter the discharge component from the classifying wheel 500 and will not be crushed again, thereby reducing the output of fine powder and effectively improving the yield of qualified particles. Unqualified particles enter the cavity 100A from below the classifying wheel 500 and are driven upward by the nozzle 310 to impact and crush on the guide plate assembly 200.

[0042] In a further embodiment, a discharge channel 400A is formed inside the discharge component 400, and the inlet of the discharge channel 400A is directly below the qualified outlet of the classifier 500; at least part of the inlet and the inlet of the classifier 500 are on the same horizontal plane.

[0043] In this scheme, the inlet of the discharge channel 400A is located directly below the qualified outlet of the classifying wheel 500, which ensures that most of the qualified materials can enter the discharge channel 400A for discharge. The fact that at least part of the inlet of the feed port and the inlet of the classifying wheel 500 are on the same horizontal plane ensures that most of the materials entering the cavity 100A can first enter the classifying wheel 500 for classification and screening, rather than being crushed, thereby effectively reducing the output of fine powder.

[0044] Please refer to Figure 4 In a further embodiment, the housing 100 and the nozzle 310 are arranged to form an annular groove 100B, and the annular groove 100B and the nozzle 310 are arranged concentrically; the air mill also includes an air inlet pipe 320, which is connected to the annular groove 100B to form an auxiliary airflow from the annular groove 100B so that the material enters the main airflow.

[0045] In this scheme, the annular groove body 100B surrounds the nozzle 310, thus forming a secondary gas flow around the primary gas flow, which can drive the material not in the primary gas flow to move into the primary gas flow, thereby ensuring that all materials will be effectively crushed. For the driving effect of the secondary gas flow, please refer to Figure 5 , the arrow in Figure 5 points to the gas flow direction.

[0046] Further, the gas inlet pipe 320 is provided in multiple, and the multiple gas inlet pipes 320 are arranged in the circumferential direction of the nozzle 310 to ensure that the secondary gas flow sprayed by the annular groove body 100B is uniform, and on the other hand, it is also necessary to ensure that the speed of the secondary gas flow is lower than that of the primary gas flow, which can be achieved by setting the gas pressure of the two, that is, controlling the gas pressure of the primary gas flow to be greater than that of the secondary gas flow. The gas pressure of the primary gas flow in conventional products is one to eight kilograms of pressure, and the gas pressure of the secondary gas flow is less than one kilogram of pressure.

[0047] Please refer to Figure 3 , in further embodiments, the material guiding disc assembly 200 includes: a disc seat 210 arranged on the discharging member 400; and a target material 220 located directly above the nozzle 310, so that the material driven by the primary gas flow is crushed when it hits the target material 220; the target material 220 is conical and located directly below the inlet of the discharging channel 400A and the grading wheel 500, so that the crushed material is guided to the grading wheel 500 for re-grading.

[0048] In this scheme, the primary gas flow formed by the nozzle 310 will drive the material to hit the target material 220, thereby crushing the material. Since the target material 220 is conical, the material hitting the target material 220 will move along the conical surface of the target material 220 until it reaches the periphery of the grading wheel 500 and is absorbed by the grading wheel 500 for re-grading. Further, at least part of the disc seat 210 can be arranged in a circular table shape to cooperate with the target material 220 for guidance.

[0049] The design of the material guiding disc assembly 200 makes it possible for most of the material to enter the grading wheel 500 after each time it is driven by the gas flow to hit the target material 220, that is, the material is graded once for each time it is crushed. The qualified material is directly discharged from the discharging member 400, and the material with a particle size that is too large is crushed again, thereby reducing the amount of particle crushing while reducing the production of fine powder to improve the output rate of qualified material.

[0050] In further embodiments, the material guiding disc assembly 200 further includes: a first connecting member 230 connecting the disc seat 210 and the discharging member 400; a second connecting member 240 connecting the target material 220 and the discharging member 400 and clamping the disc seat 210 between the target material 220 and the discharging member 400; the disc seat 210 is provided with a through hole, and the second connecting member 240 passes through the disc seat 210 from the through hole.

[0051] In a further embodiment, the material guide plate assembly 200 further comprises a pressure sensor 250 connected to the second connecting member 240; the target material 220 is provided with a mounting groove (not shown in the figure), and the pressure sensor 250 is arranged in the mounting groove and located directly below the nozzle hole of the nozzle 310 to obtain the wear state of the target material 220 according to the pressure.

[0052] It should be noted that the wear state of the target material 220 is obtained according to the pressure state. Specifically, the pressure sensor 250 is arranged in the mounting groove and is not subjected to pressure. The nozzle 310 impacts the target material 220 by spraying a high-pressure main gas flow to wear the target material 220. Since the target material 220 is conical, and the pressure sensor 250 is located directly below the nozzle hole of the nozzle 310, when the target material 220 is worn to a certain extent (e.g., is penetrated), the material will directly impact the pressure sensor 250 at this time, and thus the pressure sensor 250 can determine that the target material 220 has been worn and needs to be replaced by detecting the pressure value.

[0053] In a further embodiment, the second connecting member 240 is further provided with a mounting channel (not shown in the figure), and the mounting channel penetrates the second connecting member 240 along the axial direction of the second connecting member 240; the pressure sensor 250 is clamped into the mounting channel to connect the second connecting member 240, and the power line of the pressure sensor 250 penetrates the second connecting member 240 from the mounting channel.

[0054] Further, in order to facilitate the installation of the power line of the pressure sensor 250, a channel can also be designed on the shell 100 and the discharge member 400 for the power line to pass through, and the power line can also be pre-embedded when the discharge member 400 and the shell 100 are formed, and only needs to be electrically connected with the power line of the pressure sensor 250.

[0055] Further, the outer wall of the second connecting member 240 is provided with external threads at both ends, and the discharge member 400 and the target material 220 are connected through the external threads, respectively; the mounting channel is provided with internal threads, and the pressure sensor 250 is connected through the internal threads.

[0056] In a further embodiment, the airflow mill further comprises a driving member 600 arranged on the shell 100 and located outside the cavity 100A, and a power output shaft of the driving member 600 penetrates the shell 100 and is transmissionally connected with the grading wheel 500 to drive the grading wheel 500 to grade.

[0057] In a further embodiment, the airflow mill further comprises a feeding pipe 700, a feeding valve 900, and a blower 800; the feeding valve 900 is arranged on the feeding pipe 700; the feeding pipe 700 is communicated with the cavity 100A from the feeding port; and the air outlet of the blower 800 is communicated with the feeding pipe 700 to bring the material from the feeding valve 900 into the cavity 100A.

[0058] In this scheme, the air blower 800 forms an air flow, which can drive the material from the feed valve 900 into the feed pipe 700 into the cavity 100A. The material entering the cavity 100A under the influence of the air flow will have an initial speed, thereby ensuring that most of the material can enter the classification wheel 500 for classification.

[0059] In further embodiments, the housing 100 comprises: a first housing 120, the feed port, the classification wheel 500 and the discharge member 400 are arranged on the first housing 120; a second housing 110, comprising a first mounting section 111, a second mounting section 112 and a connecting section 113, the connecting section 113 connects the first mounting section 111 and the second mounting section 112, the first mounting section 111 is connected to the first housing 120, the air inlet pipe 320 and the nozzle 310 are arranged on the second mounting section 112, the width of the connecting section 113 gradually increases from one side of the second mounting section 112 to the side of the first mounting section 111.

[0060] In further embodiments, since the width of the connecting section 113 gradually increases from one side of the second mounting section 112 to the side of the first mounting section 111, the unqualified material discharged from the classification wheel 500 will slide down along the connecting section 113 when falling, until it slides to the vicinity of the annular groove 100B, at which time the unqualified material will be driven upward into the main air flow by the auxiliary air flow.

[0061] In further embodiments, the nozzle 310, the discharge member 400 and the feed pipe 700 are connected to the housing 100 by flanges, while the air inlet pipe 320 is integrally formed with the housing 100, and the inlet of the discharge member 400 is arranged in gap cooperation with the qualified outlet of the classification wheel 500.

[0062] Although the embodiments of the present application have been shown and described above, it should be understood that the above-described embodiments are exemplary and are not to be construed as limiting the present application, and those of ordinary skill in the art can make changes, modifications, replacements and variations to the above-described embodiments within the scope of the present application.

Claims

1. An air jet mill characterized in that, The airflow mill comprises a shell (100), a grading wheel (500), a discharging member (400), a guide disc assembly (200), and a nozzle (310); The shell (100) surrounds a cavity (100A), the grading wheel (500) and the guide disc assembly (200) are arranged in the cavity (100A), and a feeding port is arranged on the shell (100) to communicate the cavity (100A) with the outside, and the feeding port is used for guiding materials into the cavity (100A); The grading wheel (500), the discharging member (400), the guide disc assembly (200), and the nozzle (310) are sequentially arranged from high to low in the height direction, and the feeding port is not lower than the grading wheel (500) in the height direction, so that the materials are classified and then discharged by the discharging member (400) and crushed below the discharging member (400); The nozzle (310) is used for spraying a main airflow towards the top, so that the materials are crushed after being impacted on the guide disc assembly (200) by the main airflow and guided to the grading wheel (500) by the guide disc assembly (200) for re-classification; The discharging member (400) is internally formed with a discharging channel (400A), and an inlet of the discharging channel (400A) is located directly below an eligible outlet of the grading wheel (500); At least part of the feeding port and the inlet of the grading wheel (500) are located on the same horizontal plane; A disc seat (210) is arranged on the discharging member (400); A target material (220) is located directly above the nozzle (310), so that the materials crushed by the main airflow are impacted on the target material (220); The target material (220) is conical and located directly below the inlet of the discharging channel (400A) and the grading wheel (500), so that the crushed materials are guided to the grading wheel (500) for re-classification; A first connecting member (230) connects the disc seat (210) and the discharging member (400); A second connecting member (240) connects the target material (220) and the discharging member (400) and clamps the disc seat (210) between the target material (220) and the discharging member (400); The disc seat (210) is provided with a through hole, and the second connecting member (240) passes through the disc seat (210) from the through hole; The guide disc assembly (200) further comprises a pressure sensor (250) connected to the second connecting member (240); The target material (220) is provided with a mounting groove, the pressure sensor (250) is arranged in the mounting groove, and the pressure sensor (250) is located directly below a nozzle hole of the nozzle (310) to obtain the wear state of the target material (220) according to pressure.

2. The airflow mill according to claim 1, wherein The shell (100) and the nozzle (310) surround an annular groove (100B), and the annular groove (100B) and the nozzle (310) are arranged with the same center. ​ The jet mill further comprises an air inlet pipe (320) in communication with the annular groove (100B) to form a secondary air flow from the annular groove (100B) to make the material enter the primary air flow.

3. The jet mill according to claim 1, characterized in that, The second connecting piece (240) is further provided with a mounting channel penetrating the second connecting piece (240) along the axial direction of the second connecting piece (240); The pressure sensor (250) is clamped into the mounting channel to connect the second connecting piece (240), and the power line of the pressure sensor (250) penetrates the second connecting piece (240) from the mounting channel.

4. The jet mill of claim 1, wherein, The jet mill further comprises a driving member (600) arranged on the shell (100) and located outside the cavity (100A), a power output shaft of the driving member (600) penetrates the shell (100) and is drivingly connected with the classification wheel (500) to drive the classification wheel (500) to classify.

5. The jet mill of claim 1, wherein, The jet mill further comprises a feeding pipe (700), a feeding valve (900) and a blower (800), the feeding valve (900) is arranged on the feeding pipe (700), the feeding pipe (700) is in communication with the cavity (100A) from the feeding port, and the air outlet of the blower (800) is in communication with the feeding pipe (700) to bring the material from the feeding valve (900) into the cavity (100A).

6. The jet mill of claim 2, wherein, The shell (100) comprises: A first shell (120), the feeding port, the classification wheel (500) and the discharging member (400) are arranged on the first shell (120); A second shell (110) comprising a first mounting section (111), a second mounting section (112) and a connecting section (113), the connecting section (113) connects the first mounting section (111) and the second mounting section (112), the first mounting section (111) is connected with the first shell (120), the air inlet pipe (320) and the nozzle (310) are arranged on the second mounting section (112), and the width of the connecting section (113) from one side of the second mounting section (112) to the first mounting section (111) gradually increases.

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