A trip unit and circuit breaker

Abstract

The utility model relates to a tripping device and circuit breaker relates to low pressure electrical technology field. The tripping device includes drive part, tripping part and lock catch, and tripping part is located between drive part and lock catch, and one end of tripping part can butt with drive part, the other end can butt with lock catch, drive part is driven through tripping part and drives lock catch to unlock to make circuit breaker break. The tripping device realizes the transmission of force through the driven movement of tripping part between drive part and lock catch, and then realizes the unlocking of lock catch, can still realize tripping through electric operation even if the inside handle is stuck, improves tripping reliability and security.

Description

Technical Field

[0001] This utility model relates to the field of low-voltage electrical technology, and more specifically, to a tripping device and a circuit breaker. Background Technology

[0002] As a core component of circuit protection, the reliability of the circuit breaker's tripping device directly determines the effectiveness of the emergency tripping function. Traditional tripping devices generally employ a dual operation mode of manual operation and electric tripping.

[0003] The electric tripping process of existing circuit breakers typically involves a motor driving a gear assembly, which in turn moves a trip lever to actuate an internal handle, triggering the internal tripping mechanism to achieve tripping. However, when the external button is continuously pressed after the circuit breaker is closed, the internal handle becomes mechanically stuck and cannot be driven by the trip lever, resulting in tripping failure. This reduces the reliability of the circuit breaker's tripping and may lead to safety accidents in emergency situations due to the inability to disconnect the circuit in time. Utility Model Content

[0004] The purpose of this utility model is to provide a tripping device and circuit breaker that can avoid the problem of being unable to achieve tripping electrically when the inner handle is stuck, thereby improving the tripping reliability and the safety of the circuit breaker.

[0005] The embodiments of this utility model are implemented as follows:

[0006] In one aspect, this utility model provides a tripping device, including a driving member, a tripping part, and a latch. The tripping part is located between the driving member and the latch, and one end of the tripping part can abut against the driving member and the other end can abut against the latch. The driving member is driven to unlock the latch through the tripping part, so as to trip the circuit breaker.

[0007] Optionally, the tripping part includes a first tripping lever and a second tripping lever; the first tripping lever has a first abutting part and a first pushing part, the first abutting part being used to abut against the driving member; the second tripping lever has a second abutting part and a second pushing part, the second pushing part being used to abut against the latch; the driving member is driven to move the first pushing part toward the second abutting part through the first abutting part; the first pushing part is able to abut against the second abutting part and push the second tripping lever to move, so that the second pushing part drives the latch to unlock.

[0008] Optionally, the tripping part includes a first tripping lever, which has a first abutting part and a first pushing part. The first abutting part is used to abut against the driving member, and the first pushing part is used to abut against the latch. The driving member is driven to move the first pushing part toward the latch and abut against the latch through the first abutting part, so as to drive the latch to unlock.

[0009] Optionally, the first tripping rod has a first mounting plate with a through hole for a rotating shaft to pass through, so that the first tripping rod can be rotatably mounted on the base of the circuit breaker.

[0010] Optionally, the second tripping rod has a second mounting plate with a through hole for a rotating shaft to pass through; the tripping device also includes an armature with a mounting hole coaxial with the through hole, and the rotating shaft passes through the through hole and the mounting hole in sequence, so that the second tripping rod and the armature are rotatably mounted on the base of the circuit breaker.

[0011] Optionally, the end of the first trip lever facing the second trip lever has a bent portion, which bends toward the second abutment portion to form a first push portion.

[0012] Optionally, a rotating member is sleeved on one end of the first tripping rod near the first abutment portion. The rotating member has a through hole for inserting a rotating shaft, so that the first tripping rod can be rotatably mounted on the base of the circuit breaker.

[0013] Optionally, the armature has a release boss corresponding to the locking position, and the release part can abut against the release boss to drive the armature to rotate axially; the armature can synchronously drive the lock to unlock through the release boss and the second release rod.

[0014] Optionally, the drive component includes a transmission gear having an abutment boss, the sidewall of which has a drive surface, and the transmission gear can rotate axially to cause the drive surface to abut against the first abutment portion of the first trip lever.

[0015] In another aspect, this utility model provides a circuit breaker, including a housing, a contact system, and a tripping device; the contact system and the tripping device are disposed within the housing; the circuit breaker also includes a button disposed on the housing and an inner handle and a trip latch disposed within the housing, the trip latch can be engaged with a latch for locking or disengaged for unlocking, the inner handle is located between a drive member and a latch, and is respectively connected to the button and the trip latch in a transmission manner; the button can be driven to rotate the inner handle, thereby opening and closing the contact system.

[0016] The beneficial effects of this utility model include:

[0017] This application provides a tripping device, including a driving member, a tripping part, and a latch. The tripping part is located between the driving member and the latch, with one end of the tripping part abutting against the driving member and the other end abutting against the latch. The driving member, driven by the tripping part, unlocks the latch, thereby tripping the circuit breaker. Compared to the prior art method of tripping by actuating an internal handle, this application achieves force transmission through the driven movement of the tripping part located between the driving member and the latch, thereby unlocking the latch. Even if the internal handle is stuck, tripping can still be achieved through electric operation, improving the reliability and safety of tripping. Attached Figure Description

[0018] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 One of the structural schematic diagrams of the tripping device of the circuit breaker provided in the embodiment of this utility model;

[0020] Figure 2 This is one of the magnified diagrams showing the details at point A;

[0021] Figure 3 This is the second detailed enlarged diagram of point A;

[0022] Figure 4 A second schematic diagram of the tripping device of the circuit breaker provided in this embodiment of the utility model;

[0023] Figure 5 This is a magnified view showing the details at point B;

[0024] Figure 6 The third schematic diagram of the tripping device of the circuit breaker provided in this embodiment of the utility model;

[0025] Figure 7 This is a magnified view showing the details at point C;

[0026] Figure 8 Fourth schematic diagram of the tripping device of the circuit breaker provided in this embodiment of the utility model;

[0027] Figure 9 This is a magnified view showing the details at point D;

[0028] Figure 10 Fifth schematic diagram of the tripping device of the circuit breaker provided in this embodiment of the utility model;

[0029] Figure 11 This is a magnified view showing the details at point E.

[0030] Icons: 110-Drive component; 111-Transmission gear; 1111-Abutting boss; 120-Armature; 121-Triggering boss; 130-Triggering part; 131-First trigger lever; 1311-First abutting part; 1312-First pushing part; 1313-First mounting plate; 1314-Rotating component; 132-Second trigger lever; 1321-Second abutting part; 1322-Second pushing part; 1323-Second mounting plate; 140-Lock; 141-Trigger; 150-Shaft; 200-Circuit breaker; 201-Housing; 210-Button; 220-Inner handle; 230-Link; a-Length direction. Detailed Implementation

[0031] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0032] In the description of this utility model, it should be noted that the terms "center", "upper", "lower", "left", "right", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship that the utility model product is usually placed in during use. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0033] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0034] Please refer to Figure 1 , Figure 4 and Figure 8 This embodiment provides a tripping device, including a driving member 110, a tripping part 130, and a latch 140. The tripping part 130 is located between the driving member 110 and the latch 140, and one end of the tripping part 130 can abut against the driving member 110 and the other end can abut against the latch 140. The driving member 110 is driven to unlock the latch 140 through the tripping part 130, so that the circuit breaker 200 is tripped.

[0035] Specifically, such as Figure 1 As shown, the tripping device of this application includes a driving member 110, a tripping part 130, and a locking latch 140. The tripping part 130, the driving member 110, and the locking latch 140 are arranged along the length direction a of the housing 201 of the circuit breaker 200. The tripping part 130 is disposed between the driving member 110 and the locking latch 140 to facilitate the establishment of a power transmission path, so that the power generated by the driving member 110 is transmitted to the tripping part 130, and then transmitted from the tripping part 130 to the locking latch 140.

[0036] One side of the latch 140 is locked to the trip latch 141. At this time, the moving contact is in contact with the stationary contact, and the circuit breaker 200 is closed. When the tripping part 130 drives the latch 140 to rotate relative to the trip latch 141, the latch 140 separates from the trip latch 141. At this time, the latch 140 is unlocked, the moving contact separates from the stationary contact, and the circuit breaker 200 is opened.

[0037] It should be noted that, in one possible embodiment of this application, the drive member 110 includes a transmission gear 111, the transmission gear 111 has an abutment boss 1111, the side wall of the abutment boss 1111 has a drive surface, and the transmission gear 111 can rotate axially to make the drive surface abut against the release part 130.

[0038] Specifically, such as Figure 1 As shown, the driving component 110 includes at least one transmission gear 111. When there are multiple transmission gears 111, they mesh sequentially to transmit force. One of the transmission gears 111 is connected to the output shaft of a motor within the circuit breaker 200, and the motor can sequentially drive the rotation of the transmission gears 111, thereby transmitting force. Optionally, the transmission gear 111 can be a spur gear, helical gear, etc., and can be selected according to the specific requirements of the tripping device. This application does not impose any restrictions on the specific form of the transmission gear 111.

[0039] Among them, such as Figure 2 As shown, the transmission gear 111 that can abut against the release part 130 has an abutment boss 1111. In order not to interfere with the meshing between the transmission gears 111, preferably, the abutment boss 1111 is disposed in the middle of the transmission gear 111 along the rotation axis of the transmission gear 111, and the side of the release part 130 near the drive member 110 is located on the rotation path of the abutment boss 1111. When the transmission gear 111 is driven to rotate, the abutment boss 1111 rotates with the transmission gear 111 until it abuts against the release part 130 and applies force to the release part 130, thereby driving the release part 130 to move. The release part 130 can transmit the force to the latch 140, thereby unlocking the latch 140.

[0040] The abutment boss 1111 has a driving surface on its sidewall, preferably an arc surface. The arc surface design allows the abutment boss 1111 to better engage with the tripping part 130 during movement, reducing stress concentration and ensuring smoother transmission, thus improving the reliability and operating efficiency of the tripping device. Furthermore, since the transmission gear 111 rotates axially, an arc surface is more suitable for axial rotation transmission.

[0041] Compared to the existing technology that uses an inner handle to open the circuit breaker, this application uses the driven movement of the release part 130 located between the drive member 110 and the latch 140 to transmit force and unlock the latch 140. Even if the inner handle 220 is stuck, it can still be released by electric operation, which improves the reliability and safety of the release.

[0042] In one possible implementation of this application, please refer to Figures 1 to 5 The tripping unit 130 includes a first tripping lever 131 and a second tripping lever 132. The first tripping lever 131 has a first abutting portion 1311 and a first pushing portion 1312. The first abutting portion 1311 is used to abut against the driving member 110. The second tripping lever 132 has a second abutting portion 1321 and a second pushing portion 1322. The second pushing portion 1322 is used to abut against the latch 140. The driving member 110 is driven to move the first pushing portion 1312 toward the second abutting portion 1321 through the first abutting portion 1311. The first pushing portion 1312 can abut against the second abutting portion 1321 and push the second tripping lever 132 to move, so that the second pushing portion 1322 can unlock the latch 140.

[0043] Specifically, such as Figure 2 As shown, the tripping unit 130 includes a first tripping rod 131 and a second tripping rod 132. The first tripping rod 131 and the second tripping rod 132 cooperate with each other to gradually transmit the power generated by the driving member 110 to the latch 140, and finally realize the tripping operation of the circuit breaker 200.

[0044] In order to match the internal layout of the circuit breaker 200 housing 201, the first trip lever 131 and the second trip lever 132 can be bent according to the placement of other components. For example, Figure 2 As shown, the first tripping lever 131 has a first abutting portion 1311 at one end and a first pushing portion 1312 at the other end. In one specific embodiment of this application, the first tripping lever 131 has a first mounting plate 1313, on which a through hole is provided for a rotating shaft 150 to pass through, so that the first tripping lever 131 is rotatably mounted on the base of the circuit breaker 200. Similarly, as Figure 3As shown, the second tripping lever 132 has a second mounting plate 1323, and the second mounting plate 1323 has a through hole for passing through the rotating shaft 150 so that the second tripping lever 132 can be rotatably mounted on the base of the circuit breaker 200.

[0045] The first abutment portion 1311 serves as the connection point between the first release lever 131 and the drive member 110, and is used to receive power from the drive member 110. For example, when the drive member 110 is a transmission gear 111 driven by a motor, the abutment boss 1111 on the transmission gear 111 will contact the first abutment portion 1311 and apply force during rotation.

[0046] It should be noted that the first abutting part 1311 can be a planar structure so as to form a larger contact area with the abutting boss 1111 of the driving member 110 and improve the efficiency of force transmission; or it can be a groove structure to cooperate with the abutting boss 1111 structure to prevent misalignment during force transmission.

[0047] like Figure 2 As shown, the first pushing part 1312 is positioned opposite the first abutting part 1311 on the first tripping lever 131. When the first abutting part 1311 is subjected to the force of the driving member 110, the first tripping lever 131 will rotate around the rotating shaft 150 as the rotation center, and drive the first pushing part 1312 to move towards the second tripping lever 132, so as to transmit the force to the second tripping lever 132 through the first pushing part 1312.

[0048] Similarly, as Figure 3 As shown, one end of the second trip lever 132 is a second abutment portion 1321, used to receive the power transmitted from the first trip lever 131; the other end is a second push portion 1322, responsible for transmitting the power to the latch 140. The second abutment portion 1321 can effectively cooperate with the first push portion 1312 of the first trip lever 131. When the first push portion 1312 moves towards the second trip lever 132 under the action of the drive member 110, the second abutment portion 1321 will contact the first push portion 1312 and receive the force transmitted by it.

[0049] When the second release lever 132 moves under the push of the first release lever 131, the second release lever 132 can rotate around the pivot 150 as the rotation center, and drive the second push part 1322 to move accordingly, so as to abut against the latch 140 and push the latch 140 to unlock.

[0050] For example, such as Figure 4 and Figure 5The tripping device also includes an armature 120, which has a mounting hole coaxial with the through hole. The rotating shaft 150 passes through the through hole and the mounting hole in sequence, so that the second tripping rod 132 and the armature 120 are rotatably mounted on the base of the circuit breaker 200.

[0051] like Figure 5 As shown, the armature 120 and the second release lever 132 are coaxially arranged, so that the second release lever 132 can drive the armature 120 to rotate synchronously and transmit the force to the lock 140 through the release boss 121, ensuring that the second release lever 132 and the release boss 121 can accurately contact the lock 140 and play their role during the movement of the armature 120.

[0052] Optionally, such as Figure 5 As shown, the first tripping lever 131 has a bent portion at one end facing the second tripping lever 132, and the bent portion is bent toward the second abutment portion 1321 to form the first pushing portion 1312. Of course, in addition to providing a bent portion, the first pushing portion 1312 can also be other structural forms, such as a push plate, etc. Its specific shape and structure can be adjusted according to the spatial layout within the circuit breaker 200 housing 201 and the relative positions of the first tripping lever 131 and the second tripping lever 132. This application does not impose any restrictions on this.

[0053] In another possible implementation of this application, such as Figure 6 and Figure 10 As shown, the tripping part 130 includes a first tripping lever 131, which has a first abutting part 1311 and a first pushing part 1312. The first abutting part 1311 is used to abut against the driving member 110, and the first pushing part 1312 is used to abut against the latch 140. The driving member 110 is driven to move the first pushing part 1312 toward the latch 140 through the first abutting part 1311 and abut against the latch 140, thereby driving the latch 140 to unlock.

[0054] Specifically, in addition to the implementation of setting two release levers, the release part 130 may also be provided with only one first release lever 131. The two ends of the first release lever 131 can respectively abut against the drive member 110 and the latch 140, and the drive member 110 can directly transmit force to the latch 140 through the first release lever 131.

[0055] In order to match the internal layout of the circuit breaker 200 housing 201, the first tripping rod 131 can be bent according to the setting position of other components and rotated onto the base of the circuit breaker 200.

[0056] In one specific embodiment of this application, such as Figure 6 and Figure 7As shown, the first tripping rod 131 has a first mounting plate 1313, and the first mounting plate 1313 has a through hole for the rotating shaft 150 to pass through, so that the first tripping rod 131 is rotatably mounted on the base of the circuit breaker 200, and the first tripping rod 131 can rotate about the rotating shaft 150 as the axis of rotation 150.

[0057] For example, such as Figure 8 and Figure 9 As shown, the tripping device also includes an armature 120, which has a mounting hole coaxially arranged with the through hole. The rotating shaft 150 passes through the through hole and the mounting hole in sequence, so that the first tripping rod 131 and the armature 120 are rotatably mounted on the base of the circuit breaker 200. The armature 120 and the first tripping rod 131 are coaxially arranged, so that the first tripping rod 131 can drive the armature 120 to rotate synchronously and transmit the force to the latch 140 through the tripping boss 121, ensuring that the first tripping rod 131 and the tripping boss 121 can accurately contact the latch 140 and perform their functions during the movement of the armature 120.

[0058] In another specific embodiment of this application, Figure 10 and Figure 11 As shown, a rotating member 1314 is fitted onto one end of the first tripping lever 131 near the first abutment portion 1311. The rotating member 1314 has a through hole for a rotating shaft 150 to pass through, so that the first tripping lever 131 is rotatably mounted on the base of the circuit breaker 200. Optionally, the rotating member 1314 is located on the top of the housing 201 of the circuit breaker 200. This arrangement saves space and improves space utilization.

[0059] For example, such as Figure 5 and Figure 9 As shown, the armature 120 has a release boss 121 corresponding to the position of the latch 140. The release part 130 can abut against the release boss 121 to drive the armature 120 to rotate axially. The armature 120 can synchronously drive the latch 140 to unlock through the release boss 121 and the release part 130.

[0060] Specifically, such as Figure 5 and Figure 9 As shown, the armature 120 has a release boss 121 corresponding to the position of the latch 140, which can abut against the release boss 121 to drive the armature 120 to rotate axially; the armature 120 can drive the latch 140 to unlock through the release boss 121. The shape of the release boss 121 can be block-shaped, columnar, etc. Among them, the block-shaped release boss 121 has a larger contact area, which can transmit force more evenly when in contact with the latch 140; the columnar release boss 121 can improve the compactness of the spatial layout, and at the same time, it can act on the latch 140 more precisely.

[0061] In another aspect of this application embodiment, a circuit breaker 200 is also provided, including a housing 201, a contact system, and a tripping device; the contact system and the tripping device are disposed within the housing 201; the circuit breaker 200 further includes a button 210 disposed on the housing 201, and an inner handle 220 and a trip latch 141 disposed within the housing 201, the trip latch 141 being lockable by engaging with the latch 140 or unlocking by disengaging, the inner handle 220 being located between the drive member 110 and the latch 140, and being kinetically connected to the button 210 and the trip latch 141 respectively. Figure 10 As shown, button 210 and inner handle 220 are connected by a connecting rod 230, and inner handle 220 is connected to trip latch 141 by a connecting rod 230. Button 210 can be driven to rotate inner handle 220 to open and close the contact system. The specific structure and beneficial effects of the tripping device have been described in detail above and will not be repeated here.

[0062] The circuit breaker 200, through the setting of the tripping device, can still be tripped by electric operation even when the inner handle 220 is stuck, which improves the tripping reliability and the safety of the circuit breaker 200.

[0063] The above description is merely an optional embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

[0064] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable way without contradiction. In order to avoid unnecessary repetition, this utility model will not describe the various possible combinations separately.

Claims

1. A trip unit, characterized by, The circuit breaker includes a drive member (110), a tripping part (130), and a latch (140). The tripping part (130) is located between the drive member (110) and the latch (140), and one end of the tripping part (130) can abut against the drive member (110) and the other end can abut against the latch (140). The drive member (110) is driven to unlock the latch (140) through the tripping part (130) so that the circuit breaker (200) can be tripped. The tripping part (130) includes a first tripping rod (131). The first tripping rod (131) has a first mounting plate (1313). The first mounting plate (1313) has a through hole for a rotating shaft (150) to pass through, so that the first tripping rod (131) can be rotatably mounted on the base of the circuit breaker (200).

2. The trip unit of claim 1, wherein, The tripping part (130) includes a second tripping lever (132); the first tripping lever (131) has a first abutting part (1311) and a first pushing part (1312), the first abutting part (1311) being used to abut against the driving member (110); the second tripping lever (132) has a second abutting part (1321) and a second pushing part (1322), the second pushing part (1322) being used to abut against the latch (140); the driving member (110) is driven by the first abutting part (1311) to drive the first pushing part (1312) toward the second abutting part (1321); the first pushing part (1312) can abut against the second abutting part (1321) and push the second tripping lever (132) to move, so that the second pushing part (1322) drives the latch (140) to unlock.

3. The tripping device according to claim 1, characterized in that, The first release lever (131) has a first abutting part (1311) and a first pushing part (1312). The first abutting part (1311) is used to abut against the driving member (110), and the first pushing part (1312) is used to abut against the latch (140). The driving member (110) is driven to move the first pushing part (1312) toward the latch (140) and abut against the latch (140) through the first abutting part (1311) to drive the latch (140) to unlock.

4. The tripping device according to claim 2, characterized in that, The second tripping rod (132) has a second mounting plate (1323) with a through hole for a rotating shaft (150) to pass through. The tripping device also includes an armature (120) with a mounting hole coaxial with the through hole. The rotating shaft (150) passes through the through hole and the mounting hole in sequence, so that the second tripping rod (132) and the armature (120) are rotatably mounted on the base of the circuit breaker (200).

5. The tripping device according to claim 2, characterized in that, The first release lever (131) has a bent portion at one end toward the second release lever (132), and the bent portion is bent toward the second abutment portion (1321) to form the first push portion (1312).

6. The tripping device according to claim 3, characterized in that, The first tripping rod (131) is fitted with a rotating part (1314) at one end near the first abutment part (1311). The rotating part (1314) has a through hole for inserting a rotating shaft (150) so that the first tripping rod (131) can be rotatably mounted on the base of the circuit breaker (200).

7. The tripping device according to claim 4, characterized in that, The armature (120) has a release boss (121) corresponding to the position of the latch (140), and the release part (130) can abut against the release boss (121) to drive the armature (120) to rotate axially; the armature (120) can drive the latch (140) to unlock synchronously with the second release rod (132) through the release boss (121).

8. The tripping device according to claim 2 or 3, characterized in that, The drive member (110) includes a transmission gear (111), the transmission gear (111) has an abutment boss (1111), the side wall of the abutment boss (1111) has a drive surface, and the transmission gear (111) can rotate axially to make the drive surface abut against the first abutment portion (1311) of the first trip lever (131).

9. A circuit breaker, characterized in that, The circuit breaker (200) includes a housing (201), a contact system, and a tripping device as described in any one of claims 1-8; the contact system and the tripping device are disposed within the housing (201); the circuit breaker (200) further includes a button (210) disposed on the housing (201) and an inner handle (220) and a trip latch (141) disposed within the housing (201), the trip latch (141) being able to engage and lock or disengage and unlock with the latch (140), the inner handle (220) being located between the drive member (110) and the latch (140), and being pulsatorically connected to the button (210) and the trip latch (141) respectively; the button (210) can be driven to rotate the inner handle (220) to open the contact system.

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