Discharging and fluidizing device for powder bin

Abstract

The utility model provides a powder bin discharging fluidization device and equipment thereof, the device comprises a barrel, an air inlet assembly and a breathable isolation layer, the barrel comprises a first barrel body and a second barrel body, the first barrel body is provided with a barrel cavity, the second barrel body is provided with a discharging cavity and a discharging port, and the barrel cavity, the discharging cavity and the discharging port are sequentially communicated; the air inlet assembly comprises a pressure regulator, an air inlet pipe and an air inlet piece which are sequentially connected, the breathable isolation layer is arranged on the inner side of the second barrel, an air inlet chamber is formed between the inner side wall of the second barrel and one face of the breathable isolation layer, the air inlet piece is communicated with the air inlet chamber, and the air inlet chamber is communicated with the discharging cavity through the breathable isolation layer. Compressed air is compressed through the pressure regulator, sequentially passes through the air inlet pipe and the air inlet piece, then enters the air inlet chamber and then enters the discharging cavity through the breathable isolation layer, so that pressure is applied, powder materials located in the discharging cavity are fluidized, the powder materials flow out of the discharging opening, and overall fluidization of the powder materials at the bottom can be achieved through the structure. And powder materials in a bridging state can be fluidized.

Description

Technical Field

[0001] The present disclosure relates to the technical field of powder storage silo discharge fluidization, and in particular to a powder silo discharge fluidization device. Background Art

[0002] With the development of new energy, battery market demand is growing, battery technology is rapidly advancing, and battery and battery material production capacity is rapidly expanding. In battery material processing, the fluidity of powder materials during storage and metering becomes a key factor in silo design due to their inherent properties. Traditional silos typically prevent material bridging by using fluidizing bowls, percussion vibration, silo bottom vibration, and internal agitation. Fluidizing bowls and agitation are not conducive to the control of magnetic foreign matter, and the use of vibration devices in large-capacity silos can cause the material at the bottom to compact and clump, further hindering material fluidization.

[0003] To this end, the Chinese patent with patent number CN210012338U proposes a powder fluidization structure and device. The powder fluidization structure is used to receive gas and mix the gas with powder to obtain a gas-solid two-phase flow. The powder fluidization structure includes a powder isolation breathable layer. The powder isolation breathable layer divides the powder fluidization structure into an intake airflow diffusion chamber and a dispersed airflow diffusion chamber. After passing through the intake airflow diffusion chamber, the gas passes through the powder isolation breathable layer to form a dispersed airflow and acts on the powder to be transported in the dispersed airflow diffusion chamber to form a gas-solid two-phase flow.

[0004] Although the technical solution of the above patent separates the powders and controls the conveying gas-solid ratio to improve the conveying efficiency, in this method, it is inevitable that the powder will stick to the inner wall of the powder receiving bin. The long-term accumulation of powder will affect the unloading effect, and the fluidization of the powder material cannot be guaranteed.

[0005] Therefore, a fluidizing device is needed that can effectively fluidize powder and reduce the occurrence of powder material bridging. Utility Model Content

[0006] The purpose of the present disclosure is to overcome the deficiencies in the prior art and provide a powder silo unloading fluidization device that effectively fluidizes and reduces the occurrence of powder material bridging.

[0007] The purpose of this disclosure is achieved through the following technical solutions:

[0008] A powder silo unloading fluidization device includes a cylinder, an air intake assembly and an air permeable isolation layer, the cylinder includes a first cylinder and a second cylinder, the first cylinder is provided with a cylinder cavity, the second cylinder is provided with a discharge cavity and a discharge port, the cylinder cavity, the discharge cavity and the discharge port are connected in sequence; the air intake assembly includes a pressure regulator, an air intake pipe and an air intake piece connected in sequence, the pressure regulator is arranged on the outer wall of the cylinder, the air intake pipe and the air intake piece are both located in the cylinder cavity; the air permeable isolation layer is arranged on the inner side of the second cylinder, and an air intake chamber is formed between the inner side wall of the second cylinder and one side of the air permeable isolation layer, the air intake piece is connected to the air intake chamber, and the air intake chamber is connected with the discharge cavity through the air permeable isolation layer.

[0009] In one embodiment, the powder silo unloading fluidization device further includes an isolation plate, which is arranged on the inner side wall of the second cylinder, and one side of the air-permeable isolation layer extends and is connected to the isolation plate.

[0010] In one embodiment, one end of the isolation plate extends to the discharge port, and the other end of the isolation plate extends to the first cylinder.

[0011] In one embodiment, there are multiple isolation plates and multiple breathable isolation layers, and the multiple isolation plates are distributed in a circular array along the circumference of the inner wall of the second cylinder. A breathable isolation layer is provided between two adjacent isolation plates to jointly form multiple air inlet chambers.

[0012] In one embodiment, the air intake component includes an air intake base plate and a connecting column connected to each other, the air intake base plate is connected to the air intake pipe, the air intake base plate is provided with a first channel, the connecting column is provided with a second channel, and the first channel is connected to the air intake chamber through the second channel.

[0013] In one embodiment, the second cylinder is protrudingly provided with an air intake column, the connecting column is connected to the air intake column, and the first channel is connected to the air intake chamber in sequence through the second channel and the air intake column.

[0014] In one embodiment, the pressure regulator is provided with a first connecting column and an air suction column, the air suction column is used to connect the air suction device, the air intake base plate is provided with a second connecting column, one end of the air intake pipe is connected to the first connecting column, and the other end of the air intake pipe is connected to the second connecting column, so as to be connected to the first channel through the second connecting column.

[0015] In one embodiment, the air intake bottom plate and the connecting column are an integrally formed structure.

[0016] In one embodiment, the powder silo unloading fluidization device further includes a discharge flange, which is installed at the discharge port and abuts against the inner side of the second cylinder, and a side of the air-permeable isolation layer adjacent to the discharge port abuts against the discharge flange.

[0017] In one embodiment, the discharge flange is provided with a guide hole, a partial structure of the discharge flange is located in the discharge port, and the discharge cavity is also connected to the guide hole.

[0018] In one embodiment, the first cylinder is provided with a feed pipe, the feed pipe is provided with a feed port, and the feed port, the cylinder cavity, the discharge cavity and the guide hole are connected in sequence.

[0019] Compared with the prior art, the present disclosure has at least the following advantages:

[0020] 1. In the above-mentioned powder silo unloading fluidization device, compressed air is compressed by a pressure regulator, passes through the air inlet pipe and the air inlet part in sequence, then enters the air inlet chamber, and then passes through the breathable isolation layer into the discharge cavity, thereby applying pressure to fluidize the powder material located in the discharge cavity and bonded to the breathable isolation layer. It can also fluidize the powder material in the "bridge" state and make it flow out from the discharge port. This structure realizes the overall fluidization of the bottom and ensures the efficiency of material unloading.

[0021] 2. The device controls the injection pressure and flow of compressed air through an adjustable pressure regulator to control the amount of air passing through the breathable isolation layer, thereby adjusting the silo unloading speed.

[0022] 3. The above device evenly separates the compressed air in the air inlet chamber by setting an isolation plate, that is, the space in the air inlet chamber is evenly distributed by the isolation plate, so that the compressed air evenly passes through the air-permeable isolation layer, ensuring that cavitation does not occur in the second cylinder when the device is fluidizing the powder material. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions of the embodiments of the present disclosure, the following briefly introduces the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present disclosure and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without creative work.

[0024] Figure 1 This is a schematic structural diagram of a powder silo unloading fluidization device in one embodiment;

[0025] Figure 2 for Figure 1 The shown diagram is a partial enlarged view of the powder silo discharge fluidization device at point A;

[0026] Figure 3 for Figure 1 The shown diagram is a partial enlarged view of the powder silo discharge fluidization device at position B;

[0027] Figure 4 for Figure 1 A top view of a partial component of a powder silo discharge fluidization device is shown;

[0028] Figure 5 for Figure 1 The figure shows a cross-sectional view of the powder silo unloading fluidization device in working condition.

[0029] Description of the drawings: 10-powder silo unloading fluidization device; 100-cylinder; 110-first cylinder; 111-cylinder cavity; 112-feed pipe; 1121-feed port; 120-second cylinder; 1201-ring; 121-discharge cavity; 122-discharge port; 123-air inlet chamber; 124-air inlet column; 200-air inlet assembly; 210-pressure regulator; 211-first connecting column; 212-suction column; 220-air inlet pipe; 230-air inlet piece; 231-air inlet bottom plate; 2311-second connecting column; 232-connecting column; 300-breathable isolation layer; 400-isolation plate; 500-discharge flange; 501-guide hole. DETAILED DESCRIPTION

[0030] To facilitate understanding of the present disclosure, a more comprehensive description of the present disclosure will be provided below with reference to the accompanying drawings. The accompanying drawings illustrate preferred embodiments of the present disclosure. However, the present disclosure can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a more thorough and comprehensive understanding of the disclosure.

[0031] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be an intermediate element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be an intermediate element. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only and are not intended to be the only implementation methods or limitations on relationships.

[0032] In order to better understand the technical solutions and beneficial effects of the present disclosure, the present disclosure is further described in detail below with reference to specific embodiments:

[0033] like Figures 1 to 5As shown, a powder silo unloading fluidization device 10 of an embodiment includes a barrel 100, an air intake assembly 200 and an air permeable isolation layer 300, the barrel 100 includes a first barrel 110 and a second barrel 120, the first barrel 110 is provided with a barrel cavity 111, the second barrel 120 is provided with a discharge cavity 121 and a discharge port 122, the barrel cavity 111, the discharge cavity 121 and the discharge port 122 are connected in sequence; the air intake assembly 200 includes a pressure regulator 210, an air intake pipe 220 and an air intake piece 230 connected in sequence, the pressure regulator 210 is provided on the outer wall of the barrel 100, the air intake pipe 220 and the air intake piece 230 are both connected in sequence Located in the cylinder cavity 111; the breathable isolation layer 300 is arranged on the inner side of the second cylinder 120, specifically, the second cylinder 120 is provided with a ring 1201, one side of the breathable isolation layer 300 is connected to the inner wall of the ring 1201, and the other side of the breathable isolation layer 300 is connected to the inner wall of the second cylinder 120 adjacent to the discharge port 122. Furthermore, the connection can be bonding or welding, and an air inlet chamber 123 is formed between the inner wall of the second cylinder 120 and one side of the breathable isolation layer 300, and the air inlet part 230 is connected to the air inlet chamber 123, and the air inlet chamber 123 is connected to the discharge cavity 121 through the breathable isolation layer 300.

[0034] Furthermore, the second cylinder 120 is provided with a plurality of interfaces for connecting a plurality of connection parts of the air inlet member 230, so that the air inlet member 230 is connected to the air inlet chamber 123, and the compressed air is adjusted by the pressure regulator 210 and enters the air inlet pipe 220. After passing through the air inlet member 230, the air passes through a plurality of interfaces and reaches the air inlet chamber 123, and finally passes through the breathable isolation layer 300 and rushes into the discharge cavity 121, so as to fluidize the powder material bin and achieve the material unloading effect.

[0035] To facilitate understanding by relevant technical personnel, the implementation process of the above embodiment is further explained below:

[0036] When the powder silo unloading fluidized device 10 is unloading, there is often a small amount of powder material adhering to the second cylinder 120 (i.e., located in the discharge cavity 121). At this time, the air intake component 200 sucks the outside air into itself, adjusts the air pressure through the pressure regulator 210, and injects the air into the device to form compressed air. The effect principle diagram is shown in FIG. Figure 5As shown, the compressed air passes through the air inlet pipe 220 and the air inlet member 230 in turn, and enters the air inlet chamber 123 (as indicated by the solid arrow). After passing through the breathable isolation layer 300, the compressed air enters the discharge chamber 121. The powder material flows (that is, "fluidization" in the relevant technical field) when the compressed air is mixed in, and flows out from the discharge port 122 (as indicated by the dotted arrow). Since the air pressure of the compressed air is greater than the general air pressure, the compressed air can also disperse the powder material in the "bridging" state in the relevant technical field and fluidize it. Among them, the air pressure of the pressure regulator 210 can be adjusted to control the amount of air passing through the breathable isolation layer 300, so as to achieve the fluidization effect of the powder material and increase its fluidity, thereby achieving a better unloading effect. The entire fluidization process only requires the fluidization and unloading of the powder material through compressed air. The device has no moving parts, which can reduce the possibility of foreign matter generated by internal friction.

[0037] Furthermore, the powder material can be a battery electrode material or other powdered material. The battery electrode material can specifically be one of ternary lithium nickel cobalt manganese oxide, lithium nickel cobalt aluminum oxide, lithium iron phosphate, lithium-rich manganese base, lithium cobalt oxide, etc.

[0038] In this embodiment, the permeable isolation layer 300 is a non-metallic permeable isolation layer. Furthermore, the use of a non-metallic permeable isolation layer reduces the possibility of metallic magnetic foreign matter being introduced, prevents vibration-induced compaction and agglomeration of powder materials, and effectively reduces equipment failure rates. Furthermore, the non-metallic permeable isolation layer 300 is a sintered polymer material, allowing compressed air to pass uniformly through it. This prevents cavitation and ensures fluidization of the powder materials.

[0039] like Figure 3 and Figure 4 As shown, in one embodiment, the powder silo unloading fluidization device 10 further includes an isolation plate 400, which is disposed on the inner sidewall of the second cylinder 120. One side of the air-permeable isolation layer 300 extends and is connected to the isolation plate 400. Specifically, the connection can be welding or bonding. In this embodiment, the air-permeable isolation layer 300 is welded to the isolation plate 400.

[0040] In this embodiment, if Figure 4As shown, there are multiple isolation plates 400 and multiple air-permeable isolation layers 300, and the multiple isolation plates 400 are distributed in a circular array along the circumference of the inner sidewall of the second cylinder 120, with an air-permeable isolation layer 300 located between two adjacent isolation plates 400. Furthermore, the compressed air within the air inlet chamber 123 is evenly separated by the isolation plates 400, and the air-permeable isolation layers 300 are evenly separated by the isolation plates 400, collectively forming multiple air inlet chambers 123. This ensures that the compressed air within the air inlet chamber 123 is evenly distributed, and the compressed air evenly passes through the air-permeable isolation layers 300 before entering the discharge chamber 121. This ensures that cavitation does not occur on the inner wall of the second cylinder 120 during fluidization of the powder material.

[0041] like Figure 4 As shown, in one embodiment, one end of the isolation plate 400 extends to the discharge port 122, and the other end of the isolation plate 400 extends to the first cylinder 110 to ensure that the compressed air evenly passes through the breathable isolation layer 300 without causing cavitation, thereby ensuring the fluidization effect of the powder material.

[0042] like Figure 3 As shown, in one embodiment, the air intake member 230 includes an air intake bottom plate 231 and a connecting column 232 connected to each other. The air intake bottom plate 231 is connected to the air intake pipe 220. The air intake bottom plate 231 is provided with a first channel (not shown in the figure), and the connecting column 232 is provided with a second channel (not shown in the figure). The first channel is connected to the air intake chamber 123 through the second channel, so that the compressed air passes through the air intake pipe 220 and then enters the air intake chamber 123 through the first channel of the air intake bottom plate 231 and the second channel of the connecting column 232 in sequence.

[0043] like Figure 3 As shown, in one embodiment, the second cylinder 120 is provided with an air intake column 124, and the connecting column 232 is connected to the air intake column 124. The first channel is connected to the air intake chamber 123 through the second channel and the air intake column 124 in sequence. Furthermore, the connecting column 232 is connected to the air intake column 124 by bonding, welding, clamping, or sleeve connection, so that compressed air enters the air intake chamber 123 through the first channel, the second channel, and the air intake column 124 in sequence. In this embodiment, the connecting column 232 is sleeved on the air intake column 124.

[0044] like Figure 2As shown, in one embodiment, the pressure regulator 210 is provided with a first connecting column 211 and an air suction column 212. The air suction column 212 is used to connect to an air suction device (not shown in the figure). The air intake bottom plate 231 is provided with a second connecting column 2311. One end of the air intake pipe 220 is connected to the first connecting column 211, and the other end of the air intake pipe 220 is connected to the second connecting column 2311, so that the compressed air is connected to the first channel through the second connecting column 2311. Furthermore, the air suction column 212 is a connection interface for connecting to the air suction device. The air suction device sucks in external air and forms compressed air. The compressed air in the air suction device is adjusted and discharged by adjusting the pressure regulator 210 to adjust the pressure of the compressed air output into the air intake chamber, and then adjust the air pressure passing through the breathable isolation layer 300 to control the fluidization effect of the powder material.

[0045] In one embodiment, the air intake bottom plate 231 and the connecting column 232 are integrally formed. This structure can be completed in a single process during the production process, forming an integrated structure without the need for secondary or more processing, making the entire production process more efficient and the structure more reliable.

[0046] like Figure 3 As shown, in one embodiment, the powder silo discharge fluidization device 10 further includes a discharge flange 500. The discharge flange 500 is mounted on the discharge port 122 and abuts against the inner side of the second cylinder 120. The side of the air-permeable isolation layer 300 adjacent to the discharge port 122 abuts against the discharge flange 500. The discharge flange 500 is used to connect to a flange-type switch, which is used to control whether powder discharge is to be performed by adjusting the switch state. That is, when powder material discharge is required, the flange-type switch is opened; otherwise, the flange-type switch is closed. Furthermore, the side of the air-permeable isolation layer 300 adjacent to the discharge port 122 can be bonded to the discharge flange 500 to better cooperate with the compressed air from the air inlet chamber 123 to pass through the air-permeable isolation layer 300 into the discharge chamber 121, thereby fluidizing the powder material and achieving powder material discharge.

[0047] like Figure 3 and Figure 5 As shown, in one embodiment, the discharge flange 500 is provided with a guide hole 501, and part of the structure of the discharge flange 500 is located in the discharge port 122, and the discharge cavity 121 is also connected to the guide hole 501. Furthermore, when the flange switch is opened, the powder material is pushed by compressed air from the discharge cavity 121 through the discharge port 122 to the guide hole 501, thereby realizing the unloading of the powder material.

[0048] like Figure 1As shown, in one embodiment, the first barrel 110 is provided with a feed pipe 112, which is provided with a feed port 1121. The feed port 1121, the barrel cavity 111, the discharge cavity 121, and the guide hole 501 are sequentially connected. When the powder material is discharged, the powder material enters from the feed port 1121, passes through the barrel cavity 111 and the discharge cavity 121 in sequence, and finally exits from the guide hole 501. At this time, some of the powder material is adhered to the breathable isolation layer 300. The compressed air is controlled by the air inlet assembly 200 to push the powder material, causing it to fluidize, and the powder material passes through the guide hole 501 to achieve the powder material discharge.

[0049] Compared with the prior art, the present disclosure has but is not limited to the following advantages:

[0050] 1. In the above-mentioned powder silo unloading fluidization device 10, compressed air is compressed by the pressure regulator 210, passes through the air inlet pipe 220 and the air inlet piece 230 in sequence, then enters the air inlet chamber 123, and then passes through the breathable isolation layer 300 into the discharge cavity 121, thereby applying pressure to fluidize the powder material located in the discharge cavity 121 and bonded to the breathable isolation layer 300. It can also fluidize the powder material in the "bridging" state and make it flow out from the discharge port 122. Such a structure realizes the overall fluidization of the bottom and ensures the efficiency of material unloading.

[0051] 2. The device controls the injection pressure and flow of compressed air by adjusting the pressure regulator 210 to control the amount of air passing through the breathable isolation layer 300, thereby adjusting the silo unloading speed.

[0052] 3. The above device evenly separates the compressed air in the air inlet chamber 123 by providing an isolation plate 400, that is, the space in the air inlet chamber 123 is evenly distributed by the isolation plate 400, so that the compressed air evenly passes through the air-permeable isolation layer 300, ensuring that cavitation does not occur in the second cylinder 120 when the device is fluidizing the powder material.

[0053] The above-described embodiments merely represent several implementation methods of the present disclosure. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the disclosed patent. It should be noted that a person of ordinary skill in the art may make various modifications and improvements without departing from the scope of the present disclosure, all of which fall within the scope of protection of the present disclosure. Therefore, the scope of protection of the disclosed patent shall be determined by the appended claims.

Claims

1. A powder silo unloading fluidization device (10), characterized in that: include: A barrel (100), the barrel (100) comprising a first barrel (110) and a second barrel (120), the first barrel (110) being provided with a barrel cavity (111), the second barrel (120) being provided with a discharge cavity (121) and a discharge port (122), the barrel cavity (111), the discharge cavity (121) and the discharge port (122) being connected in sequence; An air intake assembly (200), the air intake assembly (200) comprising a pressure regulator (210), an air intake pipe (220), and an air intake member (230) connected in sequence, the pressure regulator (210) being arranged on the outer wall of the cylinder (100), and the air intake pipe (220) and the air intake member (230) being both located in the cylinder cavity (111); A breathable isolation layer (300), wherein the breathable isolation layer (300) is arranged on the inner side of the second cylinder (120), an air inlet chamber (123) is formed between the inner wall of the second cylinder (120) and one side of the breathable isolation layer (300), the air inlet member (230) is connected to the air inlet chamber (123), and the air inlet chamber (123) is connected to the discharge chamber (121) through the breathable isolation layer (300).

2. The powder silo unloading fluidization device (10) according to claim 1, characterized in that: The powder silo unloading fluidization device (10) further comprises an isolation plate (400), wherein the isolation plate (400) is arranged on the inner side wall of the second cylinder (120), and one side of the air-permeable isolation layer (300) extends and is connected to the isolation plate (400).

3. The powder silo unloading fluidization device (10) according to claim 2, characterized in that: One end of the isolation plate (400) extends to the discharge port (122), and the other end of the isolation plate (400) extends to the first cylinder (110); and / or, The number of the isolation plates (400) and the air-permeable isolation layers (300) is multiple, and the multiple isolation plates (400) are distributed in a circular array along the circumference of the inner wall of the second cylinder (120), and one air-permeable isolation layer (300) is provided between two adjacent isolation plates (400) to jointly enclose a plurality of the air inlet chambers (123).

4. The powder silo unloading fluidization device (10) according to claim 1, characterized in that: The air intake component (230) comprises an air intake bottom plate (231) and a connecting column (232) connected to each other, the air intake bottom plate (231) is connected to the air intake pipe (220), the air intake bottom plate (231) is provided with a first channel, the connecting column (232) is provided with a second channel, and the first channel is connected to the air intake chamber (123) through the second channel.

5. The powder silo unloading fluidization device (10) according to claim 4, characterized in that: The second cylinder (120) is provided with an air intake column (124), the connecting column (232) is connected to the air intake column (124), and the first channel is connected to the air intake chamber (123) through the second channel and the air intake column (124) in sequence.

6. The powder silo unloading fluidization device (10) according to claim 4, characterized in that: The pressure regulator (210) is provided with a first connecting column (211) and an air suction column (212), wherein the air suction column (212) is used to connect an air suction device, and the air intake bottom plate (231) is provided with a second connecting column (2311), one end of the air intake pipe (220) is connected to the first connecting column (211), and the other end of the air intake pipe (220) is connected to the second connecting column (2311), so as to be connected to the first channel through the second connecting column (2311).

7. The powder silo unloading fluidization device (10) according to claim 4, characterized in that: The air intake bottom plate (231) and the connecting column (232) are an integrally formed structure.

8. The powder silo unloading fluidization device (10) according to claim 1, characterized in that: The powder silo unloading fluidization device (10) also includes a discharge flange (500), which is installed on the discharge port (122) and abuts against the inner side of the second cylinder (120), and the air-permeable isolation layer (300) abuts against the discharge flange (500) on one side adjacent to the discharge port (122).

9. The powder silo unloading fluidization device (10) according to claim 8, characterized in that: The discharge flange (500) is provided with a guide hole (501), a part of the structure of the discharge flange (500) is located in the discharge port (122), and the discharge cavity (121) is also connected to the guide hole (501).

10. The powder silo unloading fluidization device (10) according to claim 9, characterized in that: The first cylinder (110) is provided with a feed pipe (112), and the feed pipe (112) is provided with a feed port (1121), and the feed port (1121), the cylinder cavity (111), the discharge cavity (121) and the guide hole (501) are sequentially connected.

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