A circuit protection device with intelligent fault warning function

Abstract

The present invention discloses a circuit protection device with an intelligent fault warning function, comprising a mounting housing, an electrical connection assembly and a protection assembly. The mounting housing is composed of a first transverse section, a second transverse section and a vertical section connecting the first transverse section and the second transverse section. The electrical connection assembly is provided with a first electrical connector, a second electrical connector and an isolating member, and the protection assembly is provided with a protection seat, a driving member, a manual member, a rotating member and a rotating member and a locking member arranged inside the rotating member. The circuit protection device with an intelligent fault warning function can be driven manually and electrically by a driving member, and can quickly disconnect the first electrical connector and the second electrical connector in the electrical connection assembly, achieving a quick disconnection effect. After the circuit is disconnected, the isolating member can play a limiting role and cannot be reset in the reverse direction, thereby improving the safety performance of the circuit protection and avoiding the occurrence of accidents.

Description

Technical Field

[0001] The present invention relates to circuit protection technology, and in particular to a circuit protection device with an intelligent fault early warning function. Background Art

[0002] The rapid development of informatization has made people more and more dependent on electronic equipment and products. These electronic equipment and products are inseparable from the power supply. The safety of the power supply has become the focus of people's attention. In order to ensure the safety of electricity use, people have installed switch circuit protectors in electrical appliances. Traditional switch circuit protectors will cause the bimetallic strip to heat up and deform and separate the moving and static contacts through current overload to achieve the purpose of cutting off the power supply circuit.

[0003] However, it uses manual closing, which is not suitable for some environments. In addition, manual closing cannot play a limiting role, resulting in the circuit being able to be closed infinitely after being disconnected, which poses certain safety risks. Summary of the Invention

[0004] In order to solve the above-mentioned defects in the prior art, the present invention proposes a circuit protection device with an intelligent fault warning function.

[0005] The technical solution of the present invention is achieved as follows:

[0006] A circuit protection device with intelligent fault warning function, comprising:

[0007] A mounting shell, the mounting shell is composed of a first transverse section, a second transverse section and a vertical section connecting the first transverse section and the second transverse section, and the vertical section is provided with a movable opening,

[0008] An electrical connection assembly is provided in the middle of the mounting housing, wherein the electrical connection assembly includes a first electrical connection member, a second electrical connection member, and an isolating member, wherein the first electrical connection member is mounted on the first transverse section, the second electrical connection member and the isolating member are mounted on the second transverse section, and the first electrical connection member is disposed between the second electrical connection member and the isolating member.

[0009] and a protection assembly arranged in the middle of the mounting shell, the protection assembly being mounted on the second transverse section, the protection assembly being provided with a protection seat, a driving member, a manual member, a rotating member, and a rotating member and a locking member arranged inside the rotating member, the manual member being arranged in the movable opening, the driving member being mounted in the middle of the protection seat through a first rotating shaft, the manual member being mounted in the middle of the protection seat through a second rotating shaft, a first spring being provided between the driving member and the manual member, pressing the manual member to keep the manual member pushing the driving member to rotate around the first rotating shaft, pushing the second electrical connector, and keeping the second electrical connector separated from the first electrical connector,

[0010] A rotating shaft is provided at one end of the rotating member, a motor cooperating with the rotating shaft is provided on the protective seat, the locking members are rotationally symmetrically arranged on both sides of the rotating member, and one end of the locking member is installed in the middle of the protective seat through a third rotating shaft. The rotation of the motor drives the rotating member to rotate, pushing one end of the locking member to rotate, maintaining contact with the inner wall of the rotating member, driving the rotating member to rotate, and pushing the driving member through the rotating member to push the second electrical connector, keeping the second electrical connector separated from the first electrical connector.

[0011] In the present invention, symmetrical baffles are provided on both sides of the protection seat, and an electromagnetic component is provided on the second transverse section. The electromagnetic component is arranged at the lower end of the baffle, and a pushing area is formed between the electromagnetic component and the baffle.

[0012] In the present invention, a second spring is provided at the upper end of the protection seat, the upper end of the second spring is in contact with the first transverse section structure, and the lower end of the second spring is in contact with the protection seat.

[0013] In the present invention, the first electrical connector is provided with symmetrically arranged contact arms, and a first avoidance area is formed between the contact arms.

[0014] In the present invention, a second avoidance area is provided in the middle of the isolating member, an elastic sheet is provided in the second avoidance area, and symmetrically arranged blocking parts are provided on the elastic sheet, and the distance between the blocking parts is greater than the width of the second avoidance area.

[0015] In the present invention, a driving block and a limiting opening are provided on the driving member. The driving block pushes the elastic sheet and the second electrical connector, and the limiting opening cooperates with the elastic sheet to limit the position.

[0016] In the present invention, a positioning block is provided on the protection seat, a avoiding surface and a blocking surface are provided at the lower end of the positioning block, and a contact surface cooperating with the blocking surface is provided on the driving member.

[0017] In the present invention, an arc-shaped opening is provided in the middle of the protection seat, the rotating member is arranged in the arc-shaped opening, and the arc angle of the arc-shaped opening is a major arc.

[0018] In the present invention, a first pushing protrusion is provided on the rotating member, and the first pushing protrusion pushes the driving member. A mounting hole is formed in the middle of the rotating member, and a first limiting step is provided on the inner wall of the mounting hole in a rotationally symmetrical manner. The locking member is provided with a second limiting step that cooperates with the first limiting step.

[0019] In the present invention, a first through hole is provided in the middle of the locking member, and a second through hole is provided in the middle of the rotating member. The first through hole and the second through hole are arranged correspondingly. A positioning rod is provided in the first through hole. A tension spring is provided on the positioning rod between the locking member and the locking member, and the tension spring is arranged in the first through hole and the second through hole.

[0020] The circuit protection device with intelligent fault warning function implemented in the present invention has the following beneficial effects: The circuit protection device with intelligent fault warning function can be driven manually or electrically via a single driver, rapidly disconnecting the first and second electrical connectors in the electrical connection assembly, achieving a quick disconnect effect. After the circuit is disconnected, the isolation member acts as a limiter, preventing reverse reset, thereby improving the safety performance of the circuit protection and preventing accidents. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic structural diagram of a circuit protection device with intelligent fault warning function according to the present invention;

[0022] Figure 2 for Figure 1 A schematic diagram of the structure in another direction;

[0023] Figure 3 for Figure 11 The main view;

[0024] Figure 4 for Figure 1 A top view of

[0025] Figure 5 for Figure 4 The cross-sectional view at AA in the figure;

[0026] Figure 6 for Figure 5 Schematic diagram of the electrical connection component structure;

[0027] Figure 7 for Figure 6 Exploded diagram;

[0028] Figure 8 for Figure 7 A schematic diagram of the structure in another direction;

[0029] Figure 9 for Figure 5 Schematic diagram of the protection component structure in;

[0030] Figure 10 for Figure 9 Exploded diagram;

[0031] Figure 11 for Figure 10Schematic diagram of the protective seat structure;

[0032] Figure 12 for Figure 10 Schematic diagram of the driving component structure;

[0033] Figure 13 for Figure 10 Schematic diagram of the manual part structure in ;

[0034] Figure 14 for Figure 10 Schematic diagram of the rotating part structure;

[0035] Figure 15 for Figure 10 Schematic diagram of the rotating part and locking part structure;

[0036] Figure 16 for Figure 15 Main perspective view.

[0037] In the figure: mounting housing 1, electrical connection component 2, protection component 3, first transverse section 4, second transverse section 5, vertical section 6, movable opening 7, manual member 8, driving member 9, second spring 10, second electrical connection member 11, connection section 12, mounting section 13, first electrical connection member 14, detector 15, motor 16, rotating member 17, locking member 18, rotating member 19, first limiting step 20, second limiting step 21, isolating member 22, first fixing section 23, first contact section 24, contact arm 25, first avoidance area 26, arc section 27, second fixing section 28, second contact section 29, contact portion 30, extension section 31, second avoidance area 32, elastic sheet 33, arc section 34, blocking portion 35, first rotating shaft 36, driving block 37, limiting opening 38, end 39 1. Protective seat 39, second rotating axis 40, active area 41, first rotating hole 42, second rotating hole 43, arc-shaped mouth 44, third rotating hole 45, fourth rotating hole 46, third rotating axis 47, rotating axis 48, positioning block 49, avoidance surface 50, blocking surface 51, contact surface 52, moving gap 53, first spring 54, first limiting buckle 55, second limiting buckle 56, support plate 57, limiting surface 58, bearing surface 59, stop block 60, second pushing protrusion 61, pushing surface 62, pressing surface 63, baffle 64, electromagnetic component 65, pushing area 66, first pushing protrusion 67, arc-shaped surface 68, mounting hole 69, hinged end 70, free end 71, first through hole 72, second through hole 73, positioning rod 74, tension spring 75, sliding portion 76, strip hole 77. DETAILED DESCRIPTION

[0038] The technical solutions in the embodiments of the present invention will be described clearly and completely below with reference to the accompanying drawings in the embodiments of the present invention.

[0039] like Figures 1 to 16 As shown, the circuit protection device with intelligent fault warning function of the present invention includes an installation shell 1, an electrical connection component 2 and a protection component 3. The electrical connection component 2 and the protection component 3 are both arranged inside the installation shell 1. The electrical connection component 2 is used to maintain the connectivity of the circuit, and the protection component 3 is used to realize the connection and disconnection of the electrical connection component 2. When a fault occurs, it can be disconnected manually or electrically.

[0040] The mounting housing 1 comprises a first transverse section 4, a second transverse section 5, and a vertical section 6 connecting the first and second transverse sections 4 and 5. A movable opening 7 is provided in the vertical section 6 for mounting a manual member 8, allowing the manual member 8 to rotate therein, thereby pushing the driving member 9. This opening also maintains the upward movement of the manual member 8, thereby compressing the second spring 10 and resetting the driving member 9, which pushes the second electrical connector 11.

[0041] The lower end of the first transverse section 4 is provided with a connecting section 12 and a mounting section 13, and a first electrical connector 14 is provided at the lower end of the mounting section 13. A detector 15 is provided on the second transverse section 5 for detecting whether the circuit voltage has increased. If it exceeds a preset value, a command is sent to the motor 16. The motor 16 rotates, driving the rotating member 17 to rotate. The rotating member 17 pushes the locking member 18, which contacts the rotating member 19, maintaining the first limiting step 20 and the second limiting step 21 in engagement, driving the rotating member 19 to rotate, thereby pushing the driving member 9 and separating the second electrical connector 11 from the first electrical connector 14.

[0042] The electrical connection assembly 2 is arranged in the middle of the mounting housing 1, and is provided with a first electrical connection member 14, a second electrical connection member 11 and an isolation member 22. The isolation member 22 is made of insulating material, and the manual member 8, the driving member 9 and the rotating member 19 are all made of insulating material.

[0043] The first electrical connector 14 is mounted on the first transverse section 4 , and the second electrical connector 11 and the isolating member 22 are mounted on the second transverse section 5 , with the first electrical connector 14 being disposed between the second electrical connector 11 and the isolating member 22 .

[0044] The first electrical connector 14 consists of a first fixing section 23 and a first contact section 24. The first fixing section 23 is located at the lower end of the mounting section 13. The first contact section 24 is provided with symmetrical contact arms 25, forming a first clearance area 26 between the contact arms 25. The contact arms 25 are connected to the first contact section 24 by an arcuate section 27. In the normal state, the arcuate section 27 is non-existent. After installation, the second electrical connector 11 pushes the contact arms 25, forming the arcuate section 27 at the connection with the first contact section 24.

[0045] The second electrical connector 11 consists of a second fixing segment 28 and a second contact segment 29. The second fixing segment 28 is mounted on the second transverse segment 5. The second fixing segment 28 is horizontally arranged, while the second contact segment 29 is inclined. When not installed, the angle between the second fixing segment 28 and the second contact segment 29 is greater than 90°. After installation, the second contact segment 29 contacts the first contact segment 24, pushing the contact arm 25 and deforming it to form the arc segment 27. At this time, the second contact segment 29 and the second fixing segment 28 remain perpendicular.

[0046] The second contact segment 29 is provided with a contact portion 30, which is thick and can push the contact arm 25. The second contact segment 29 is also provided with an extension segment 31, which contacts the first contact segment 24, thereby increasing the contact area and achieving a stable circuit connection.

[0047] A second avoidance area 32 is provided in the middle of the isolating member 22, and an elastic sheet 33 is provided in the second avoidance area 32. The elastic sheet 33 and the second avoidance area 32 are connected by an arc portion 34. The first avoidance area 26 and the second avoidance area 32 are both used to avoid the driving member 9. The elastic sheet 33 is provided with symmetrically arranged blocking portions 35, and the distance between the blocking portions 35 is greater than the width of the second avoidance area 32. The blocking portions 35 can prevent the elastic sheet 33 from entering the second avoidance area 32, thereby maintaining a large distance between the first contact segment 24 and the second contact segment 29 when the driving member 9 is placed on the elastic sheet 33, thereby achieving a safe isolation effect.

[0048] After the driver 9 rotates about the first rotation axis 36, it first enters the second avoidance area 32, pushing the elastic sheet 33, keeping the elastic sheet 33 pushing the second contact segment 29, separating the second electrical connector 11 from the first electrical connector 14 and disconnecting the circuit. The drive block 37 on the driver 9 then supports the second contact segment 29, while the elastic sheet 33 resets under its own elastic force, keeping the limit opening 38 positioned on the end 391 of the elastic sheet 33, supporting the driver 9 and preventing it from resetting. The first rotation axis 36 on the driver 9 is at the upper end of the driver 9, so the lower end is heavier and naturally rotates downward under its own gravity, thereby keeping the lower end of the driver 9 on the elastic sheet 33.

[0049] The protection assembly 3 is disposed in the center of the mounting housing 1 and is mounted on the second transverse section 5. The protection assembly 3 includes a protection seat 39, a driving member 9, a manual member 8, a rotating member 19, and a rotating member 17 and a locking member 18 disposed within the rotating member 19. The manual member 8 is disposed within the movable opening 7. The driving member 9 is mounted in the center of the protection seat 39 via a first rotating shaft 36. The manual member 8 is mounted in the center of the protection seat 39 via a second rotating shaft 40.

[0050] A movable area 41 is defined in the center of the protective base 39, within which the drive member 9 and the manual member 8 are positioned. A first rotation hole 42 and a second rotation hole 43 are defined within the movable area 41. The first rotation shaft 36 is mounted within the first rotation hole 42, and the second rotation shaft 40 is mounted within the second rotation hole 43. A third rotation hole 45 and a fourth rotation hole 46 are defined within the arc-shaped opening 44. A third rotation shaft 47 is mounted within the third rotation hole 45, and a rotation shaft 48 is mounted within the fourth rotation hole 46.

[0051] The protection seat 39 is provided with a positioning block 49, the lower end of the positioning block 49 is provided with an avoidance surface 50 and a blocking surface 51, and the driving member 9 is provided with a contact surface 52 that cooperates with the blocking surface 51. A moving gap 53 is formed between the contact surface 52 and the blocking surface 51.

[0052] A first spring 54 is provided between the driving member 9 and the manual member 8. The driving member 9 is provided with a first limiting buckle 55, which is arranged at an angle. The manual member 8 is provided with a second limiting buckle 56, and the first spring 54 is arranged between the first limiting buckle 55 and the second limiting buckle 56. Furthermore, a support plate 57 is provided within the movable area 41, and the first spring 54 is mounted on the support plate 57.

[0053] The driving member 9 is provided with a driving block 37 and a limiting opening 38 . The driving block 37 pushes the elastic piece 33 and the second electrical connector 11 , and the limiting opening 38 cooperates with the elastic piece 33 to limit the position.

[0054] At the same time, a limiting surface 58 is provided within the movable area 41, which cooperates with the second limiting buckle 56 to limit the upward rotation angle of the manual member 8. A bearing surface 59 is also provided within the movable area 41 to limit the downward rotation angle of the manual member 8. A stopper 60 is provided in the movable area 41 to limit the second limiting buckle 56. The manual member 8 is provided with a second pushing protrusion 61 for pushing the driving member 9. The driving member 9 is provided with a pushing surface 62 that cooperates with the second pushing protrusion 61. The manual member 8 is also provided with a downward pressing surface 63 that cooperates with the bearing surface 59.

[0055] Symmetrical baffles 64 are provided on either side of the protective seat 39. An electromagnetic element 65 is provided on the second transverse section 5. The electromagnetic element 65 is positioned at the lower end of the baffle 64, forming a pushing region 66 between the electromagnetic element 65 and the baffle 64. When energized, the electromagnetic element 65 maintains the upward push of the protective seat 39, thereby resetting the driving element 9, which is located on the elastic piece 33 and supports the second electrical connector 11. The baffle 64 is a magnet, and the opposing surfaces of the baffle 64 and the electromagnetic element 65 have the same magnetic poles.

[0056] The upper end of the protection seat 39 is provided with a second spring 10, the upper end of the second spring 10 is in contact with the first transverse section 4, and the lower end is in contact with the protection seat 39. It is convenient to reserve space for the protection seat 39 to move upward, thereby resetting the driving member 9.

[0057] The manual member 8 is pressed to keep the manual member 8 pushing the driving member 9 to rotate around the first rotation axis 36 , pushing the second electrical connector 11 and keeping the second electrical connector 11 separated from the first electrical connector 14 .

[0058] A rotating shaft 48 is provided at one end of the rotating member 17. A motor 16 is mounted on the protective seat 39, which cooperates with the rotating shaft 48. The locking members 18 are rotationally symmetrically arranged on either side of the rotating member 17, with one end of the locking member 18 mounted in the center of the protective seat 39 via the third rotating shaft 47. The rotation of the motor 16 drives the rotating member 17, which in turn drives one end of the locking member 18 to rotate, maintaining contact with the inner wall of the rotating member 17, driving the rotating member 17 to rotate. The rotating member 17 then pushes the driving member 9, which in turn pushes the second electrical connector 11, thereby separating the second electrical connector 11 from the first electrical connector 14.

[0059] An arc-shaped opening 44 is provided in the middle of the protection seat 39 , and the rotating member 19 is disposed in the arc-shaped opening 44 . The arc angle of the arc-shaped opening 44 is a major arc.

[0060] The rotating member 19 is provided with a first pushing protrusion 67, and the driving member 9 is provided with an arcuate surface 68 that cooperates with the first pushing protrusion 67. The first pushing protrusion 67 pushes the driving member 9. A mounting hole 69 is formed in the center of the rotating member 19. The inner wall of the mounting hole 69 is provided with a first limiting step 20 arranged rotationally symmetrically. The locking member 18 is provided with a second limiting step 21 that cooperates with the first limiting step 20.

[0061] The locking member 18 is composed of a hinged end 70 and a free end 71 , and the third rotation axis 47 is mounted on the hinged end 70 .

[0062] A first through hole 72 is provided in the middle of the locking member 18, and a second through hole 73 is provided in the middle of the rotating member 17. The first through hole 72 and the second through hole 73 are arranged correspondingly. A positioning rod 74 is provided in the first through hole 72, and a tension spring 75 is provided on the positioning rod 74 between the locking member 18 and the locking member 18. The tension spring 75 is arranged in the first through hole 72 and the second through hole 73.

[0063] like Figure 16As shown, when motor 16 drives rotating member 17 to rotate in the direction F1, it can maintain rotating member 17 and push locking member 18 on the side, causing it to rotate about third rotation axis 47, thereby stretching tension spring 75. When free end 71 contacts the inner wall of mounting hole 69, the friction between them is low, and it cannot drive rotating member 19 to rotate. Only after second limiting step 21 contacts first limiting step 20 can locking member 18 maintain rotation and drive member 19, and the first push protrusion 67 on rotating member 19 can push driving member 9 to rotate. After motor 16 rotates in the opposite direction, locking member 18 will return to its original position under the tension of tension spring 75, while rotating member 19 will drive it to return to its original position when driving member 9 returns to its original position.

[0064] The protective seat 39 is provided with a symmetrical sliding portion 76, and a strip hole 77 is provided in the middle of the sliding portion 76. A bolt (not shown in the figure) is set in the strip hole 77 to install the protective seat 39 on the mounting shell 1. However, since the bolt is in the strip hole 77, the protective seat 39 can slide up and down, but will not detach from the mounting shell 1.

[0065] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A circuit protection device with intelligent fault warning function, characterized in that: include: A mounting shell, the mounting shell is composed of a first transverse section, a second transverse section and a vertical section connecting the first transverse section and the second transverse section, and the vertical section is provided with a movable opening, An electrical connection assembly is provided in the middle of the mounting housing, wherein the electrical connection assembly includes a first electrical connection member, a second electrical connection member, and an isolating member, wherein the first electrical connection member is mounted on the first transverse section, the second electrical connection member and the isolating member are mounted on the second transverse section, and the first electrical connection member is disposed between the second electrical connection member and the isolating member. and a protection assembly arranged in the middle of the mounting shell, the protection assembly being mounted on the second transverse section, the protection assembly being provided with a protection seat, a driving member, a manual member, a rotating member, and a rotating member and a locking member arranged inside the rotating member, the manual member being arranged in the movable opening, the driving member being mounted in the middle of the protection seat through a first rotating shaft, the manual member being mounted in the middle of the protection seat through a second rotating shaft, a first spring being provided between the driving member and the manual member, pressing the manual member to keep the manual member pushing the driving member to rotate around the first rotating shaft, pushing the second electrical connector, and keeping the second electrical connector separated from the first electrical connector, A second avoidance area is provided in the middle of the isolating member, an elastic sheet is provided in the second avoidance area, and symmetrically arranged blocking portions are provided on the elastic sheet, and the distance between the blocking portions is greater than the width of the second avoidance area; One end of the rotating member is provided with a rotating shaft, and the protective seat is provided with a motor that cooperates with the rotating shaft. The locking members are rotationally symmetrically arranged on both sides of the rotating member, and one end of the locking member is installed in the middle of the protective seat through a third rotating shaft. The rotation of the motor drives the rotating member to rotate, pushing one end of the locking member to rotate, maintaining contact with the inner wall of the rotating member, driving the rotating member to rotate, and pushing the driving member through the rotating member to push the second electrical connector, keeping the second electrical connector separated from the first electrical connector; After the driving member rotates around the first rotation axis, the driving member will first enter the second avoidance area, push the elastic piece, and keep the elastic piece pushing the second contact section, so that the second electrical connector is separated from the first electrical connector and the circuit is disconnected.

2. The circuit protection device with intelligent fault warning function according to claim 1, characterized in that: Symmetrical baffles are provided on both sides of the protection seat, and an electromagnetic component is provided on the second transverse section. The electromagnetic component is arranged at the lower end of the baffle, and a pushing area is formed between the electromagnetic component and the baffle.

3. The circuit protection device with intelligent fault warning function according to claim 1, characterized in that: A second spring is provided at the upper end of the protection seat, wherein the upper end of the second spring is in contact with the first transverse section structure, and the lower end of the second spring is in contact with the protection seat.

4. The circuit protection device with intelligent fault warning function according to claim 1, characterized in that: The first electrical connector is provided with symmetrically arranged contact arms, and a first avoidance area is formed between the contact arms.

5. The circuit protection device with intelligent fault warning function according to claim 1, characterized in that: The driving member is provided with a driving block and a limiting opening. The driving block pushes the elastic sheet and the second electrical connector, and the limiting opening cooperates with the elastic sheet to limit position.

6. The circuit protection device with intelligent fault warning function according to claim 1, characterized in that: The protection seat is provided with a positioning block, the lower end of the positioning block is provided with a avoiding surface and a blocking surface, and the driving member is provided with a contact surface that matches the blocking surface.

7. The circuit protection device with intelligent fault warning function according to claim 1, characterized in that: An arc-shaped opening is provided in the middle of the protection seat, the rotating member is arranged in the arc-shaped opening, and the arc angle of the arc-shaped opening is a major arc.

8. The circuit protection device with intelligent fault warning function according to claim 1, characterized in that: The rotating member is provided with a first pushing protrusion, which pushes the driving member. A mounting hole is formed in the middle of the rotating member. A first limiting step is provided on the inner wall of the mounting hole and is rotationally symmetrically arranged. The locking member is provided with a second limiting step that cooperates with the first limiting step.

9. The circuit protection device with intelligent fault warning function according to claim 8, characterized in that: A first through hole is provided in the middle of the locking member, and a second through hole is provided in the middle of the rotating member. The first through hole and the second through hole are arranged correspondingly. A positioning rod is provided in the first through hole. A tension spring is provided on the positioning rod between the locking member and the locking member, and the tension spring is arranged in the first through hole and the second through hole.

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