A quick opening device for a switchgear operating system

Abstract

A kind of quick opening device of switch device operating system, it is characterized in that: it includes support, one side of the support is normal side, the other side is standby side, sliding plate is set between normal side and standby side in the support can slide back and forth, the sliding plate normal side and standby side are connected corresponding turnover lever respectively, output system one end rotatably mounted on the support, the other end is located outside the support, the support normal side and standby side are also provided with corresponding rotary lever and corresponding main spring, the output system and the corresponding rotary lever and corresponding main spring of the support normal side and standby side are linked. It is used for dual power automatic transfer switch operating system, can significantly reduce the negative influence caused by friction and static inertia between each component on mechanism opening speed when automatic transfer switch is opened, realizes the quick opening action of dual power automatic transfer switch operating mechanism.

Description

Technical Field

[0001] This invention belongs to the field of low-voltage electrical technology, specifically relating to a fast tripping device for a switching device operating system, which is particularly suitable for dual-power automatic transfer switches. Background Technology

[0002] Automatic transfer switches (ATS) are widely used in modern power transmission and distribution systems, especially in hospitals, intelligent buildings, data centers, power plants, banks, and critical infrastructure where continuous power supply is crucial. During operation, the reliability and stability of the ATS directly affect the continuous power output of the transmission and distribution lines. There are two types of ATS: two-position and three-position. Two-position ATSs switch between two states: the primary power supply is closed (while the backup power supply is open) and the backup power supply is closed (while the primary power supply is open), ensuring continuous, stable, and reliable power output. Three-position ATSs, in addition to achieving the two-position operation, can simultaneously have both the primary and backup power supplies open (i.e., double-open state) and lock the open state.

[0003] The operating system, as a core component of a dual-power automatic transfer switch, provides the kinetic energy for position switching and, through its output, drives the contact system of the automatic transfer switch to switch the closing position between the normal power supply and the standby power supply. Specifically, the operating system of a two-position automatic transfer switch has two states, corresponding to the normal power supply closed position and the standby power supply closed position, respectively. The operating system of a three-position automatic transfer switch has three states, corresponding to the normal power supply closed position, the standby power supply closed position, and the double open position, respectively.

[0004] However, in existing technologies, when automatic transfer switches are locked in two or three positions, each position is locked individually. This can easily lead to situations where one position is locked while another is unlocked, resulting in misoperation and safety accidents. Furthermore, existing dual-power automatic transfer switches have a dual-spindle structure, which cannot meet the requirements for same-side wiring and is structurally complex, with excessive motion transmission slowing down the opening speed. Another aspect is that existing dual-power automatic transfer switches require direct manual operation for closing and opening. Insufficient manpower can prevent the switch from closing and opening, while excessive manpower can easily damage the switch mechanism. Summary of the Invention

[0005] The purpose of this invention is to address the shortcomings of existing dual-power automatic transfer switch operating systems by providing a fast-opening device for a switchgear operating system. This device, used in dual-power automatic transfer switch operating systems, significantly reduces the negative impact of friction and static inertia between components on the opening speed of the mechanism during the automatic transfer switch's opening operation, thus achieving rapid opening action of the dual-power automatic transfer switch operating mechanism. The entire device improves the opening speed of the mechanism, features a modular layout, compact structure, prevents misoperation, is quick to install and maintain, convenient to operate, and highly reliable.

[0006] Technical solution

[0007] To achieve the above-mentioned technical objectives, the present invention provides a fast tripping device for a switching device operating system, characterized in that: it includes a bracket, one side of which is a normal operating side and the other side is a standby side; a sliding plate is disposed within the bracket and can slide back and forth between the normal operating side and the standby side; the normal operating side and the standby side of the sliding plate are respectively connected to corresponding flip levers; one end of an output system is rotatably mounted on the bracket, and the other end is located outside the bracket; the normal operating side and the standby side within the bracket are also provided with corresponding rotating levers and corresponding main springs; the output system and the corresponding rotating levers and corresponding main springs of the normal operating side and the standby side within the bracket are linked together.

[0008] Furthermore, the bracket is provided with mounting through holes for mounting the output system, and the inner side of the bracket is provided with a corresponding mounting shaft.

[0009] Furthermore, the corresponding flip lever is rotatably mounted on the corresponding mounting shaft, and the corresponding flip lever is pivotally connected to the corresponding side of the slide plate via the corresponding slide plate shaft. The corresponding flip lever is provided with a corresponding flip limit linkage shaft. The corresponding rotating levers on the commonly used side and the spare side of the bracket are rotatably mounted on the corresponding mounting shaft. The corresponding rotating levers are linked to the output system via the corresponding rotating linkage shaft. One end of the corresponding main spring on the commonly used side and the spare side of the bracket is mounted on the corresponding flip limit linkage shaft, and the other end is mounted on the corresponding rotating linkage shaft.

[0010] Furthermore, the output system includes a mounting bushing, which is rotatable within the mounting through hole. The mounting bushing has corresponding linkage cantilever arms on the commonly used side and the spare side, and each linkage cantilever arm has a linkage slot. A corresponding rotation linkage shaft is located within the corresponding linkage slot, causing the mounting bushing to be linked during the rotation of the corresponding rotating levers on the commonly used side and the spare side of the bracket.

[0011] Furthermore, the linkage slot is an approximately triangular hole with an arc-shaped head. A linkage limiting part is provided inside the linkage slot near the head. A linkage triggering part and a linkage acceleration part are respectively provided on both sides of the linkage slot near the mounting bushing.

[0012] Furthermore, the bracket includes a pair of side plates, which are connected and fixed together by a plurality of bracket connecting shafts.

[0013] Beneficial effects

[0014] This invention provides a fast-opening device for a switchgear operating system, used in a dual-power automatic transfer switch operating system. It significantly reduces the negative impact of friction and static inertia between components on the opening speed of the mechanism during automatic transfer switch opening operations, achieving rapid opening action of the dual-power automatic transfer switch operating mechanism. The entire device improves the opening speed of the mechanism, enabling stable switching between two or three positions of the dual-power automatic transfer switch. After the position transition is complete, when holding the final position, corresponding locking devices lock the corresponding position, and the locking devices of each position are interconnected to prevent malfunctions. It also meets the requirement that manual closing and opening are independent of human intervention. The entire device features a modular component layout, compact structure, convenient and quick installation and maintenance, easy operation, and high reliability. Attached Figure Description

[0015] Appendix Figure 1 This is a schematic diagram of the fast tripping device in an embodiment of the present invention. Figure 1 ;

[0016] Appendix Figure 2 This is a schematic diagram of the fast tripping device in an embodiment of the present invention. Figure 2 ;

[0017] Appendix Figure 3 This is a schematic diagram of the structure of side plate one in an embodiment of the present invention;

[0018] Appendix Figure 4 This is a schematic diagram of the structure of side plate two in an embodiment of the present invention;

[0019] Appendix Figure 5 This is a schematic diagram of the flipping lever structure in an embodiment of the present invention;

[0020] Appendix Figure 6 This is a schematic diagram of the rotating lever structure in an embodiment of the present invention;

[0021] Appendix Figure 7 This is a schematic diagram of the bushing installation structure in an embodiment of the present invention;

[0022] Appendix Figure 8This is a schematic diagram of the operating mechanism in the standby power supply closed state in an embodiment of the present invention;

[0023] Appendix Figure 9 This is a schematic diagram showing the lever at a dead point position during the transition of the operating mechanism from the standby power supply closed state to the open state in an embodiment of the present invention.

[0024] Appendix Figure 10 This is a schematic diagram of the state when the commonly used side rotating lever of the operating mechanism has rotated, but the spare side rotating lever has not rotated in an embodiment of the present invention;

[0025] Appendix Figure 11 This is a schematic diagram of the operating mechanism in the standby power supply tripped state in an embodiment of the present invention;

[0026] Appendix Figure 12 This is a schematic diagram of the operating mechanism in the normal power supply closed state in an embodiment of the present invention;

[0027] Appendix Figure 13 This is a schematic diagram of the lever being in a dead position during the transition of the operating mechanism from the normally used side power supply closed state to the open state in an embodiment of the present invention.

[0028] Appendix Figure 14 This is a schematic diagram of the state when the operating mechanism rotating lever has rotated, but the rotating lever has not rotated, in an embodiment of the present invention;

[0029] Appendix Figure 15 This is a schematic diagram of the operating mechanism in the normal power supply tripping state in an embodiment of the present invention; Detailed Implementation

[0030] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0031] In the description of this invention, it should be noted that the terms "inner," "outer," "front," "rear," "left," "right," "usual side," and "spare side," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for 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 the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0032] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation" and "connection" 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 mechanical connection or an electrical 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 invention based on the specific circumstances.

[0033] The present invention will now be described in further detail with reference to specific embodiments and accompanying drawings.

[0034] Example

[0035] As attached Figure 1 and 2 As shown, a fast tripping device for a switching device operating system includes a bracket 1, with one side being the normal operating side and the other side being the standby side. A sliding plate 2 is disposed within the bracket 1 and can slide back and forth between the normal operating side and the standby side. The normal operating side and the standby side of the sliding plate 2 are respectively connected to corresponding flip-up levers A1 and A1'. One end of an output system 3 is rotatably mounted on the bracket 1, and the other end is located outside the bracket 1. The normal operating side and the standby side within the bracket 1 are also provided with corresponding rotating levers C and C' and corresponding main springs D and D'. The output system 3 is linked with the corresponding rotating levers C and C' and the corresponding main springs D and D' on the normal operating side and the standby side within the bracket 1.

[0036] The specific structure of each part in this embodiment is described in further detail below, as shown in the attached figure. Figure 3 and 4 As shown, the bracket 1 includes a pair of side plates 101, 101', which are connected and fixed together by a plurality of bracket connecting shafts 1a. The bracket 1 is provided with mounting through holes 102 for mounting the output system 3. The corresponding flip levers A1, A1' are rotatably mounted on corresponding mounting shafts 104, 104' via mounting holes A1a, A1a'. The corresponding flip levers A1, A1' are pivotally connected to the corresponding side of the slide plate 2 via corresponding slide plate shafts A2, A2'. The corresponding slide plate shafts A2, A2' pass through slide plate connecting holes A1b, A1b' on the corresponding flip levers A1, A1' and flip lever connecting holes 2a, 2a' on the corresponding side of the slide plate 2. (See attached diagram) Figure 1 As shown in Figures 2 and 5, the corresponding flipping levers A1 and A1' are provided with corresponding flipping limit linkage shafts A101 and A101', as shown in the attached figures. Figure 1As shown in Figures 2 and 6, the corresponding rotating levers C and C' on the commonly used and spare sides of the bracket 1 are rotatably mounted on the corresponding mounting shafts 104 and 104' via rotating lever mounting holes Ca and Ca'. The corresponding rotating levers C and C' are linked to the output system 3 via corresponding rotating linkage shafts C1 and C1'. Both ends of the rotating linkage shafts C1 and C1' extend out of the rotating linkage shaft mounting holes C1a and C1a' of the rotating levers C and C'. One end of the corresponding main springs D and D' on the commonly used and spare sides of the bracket 1 is mounted on the corresponding flip-limit linkage shafts A101 and A101', and the other end is mounted on the corresponding rotating linkage shafts C1 and C1'.

[0037] As attached Figure 1 and 7 As shown, the output system 3 includes a mounting sleeve 301, which is rotatable within the mounting through hole 102, as illustrated in the attached figure. Figure 7 As shown, the mounting bushing 301 is provided with corresponding linkage cantilever arms 301a and 301a' on the commonly used side and the spare side, respectively. The corresponding linkage cantilever arms 301a and 301a' are provided with linkage slots 301a01 and 301a01', respectively. Figure 1 and 2 As shown, the corresponding rotating linkage shafts C1 and C1' are located in the corresponding linkage slots 301a01 and 301a01', so that the corresponding rotating levers C and C' on the commonly used side and the spare side of the bracket 1 are linked to the mounting bushing 301 during rotation. The linkage slots 301a01 and 301a01' are approximately triangular holes, and the heads of the linkage slots 301a01 and 301a01' are arc-shaped. Linkage limiting parts 301a0101 and 301a0101' are provided near the heads of the linkage slots 301a01 and 301a01'. Linkage triggering parts 301a0102 and 301a0102' and linkage acceleration parts 301a03 and 301a03' are respectively provided on both sides of the linkage slots 301a01 and 301a01' near the mounting bushing 301.

[0038] In this embodiment, when the backup power supply is in the closed state, the position states of each component are as follows: (see attached diagram) Figure 8 As shown, the flip lever A1' is at its maximum clockwise rotation angle. Since the flip levers A1 and A1' are simultaneously linked to the slide plate 2, at this time, the flip lever A1 on the commonly used side is at its maximum clockwise rotation angle, and the rotating lever C' on the spare side is at its maximum counterclockwise rotation position under the action of the main spring D'. The rotating lever C on the commonly used side is at its maximum counterclockwise rotation position under the action of the main spring D.

[0039] The line connecting the rotation centers of the commonly used side flip limit linkage shaft A101 and the commonly used side rotary linkage shaft C1 is located above the rotation center O of the commonly used side rotary lever C. The line connecting the rotation centers of the standby side flip limit linkage shaft A101' and the standby side rotary linkage shaft C1' is located below the rotation center O' of the standby side rotary lever C'. At this time, the rotary lever C is subjected to the spring force of the main spring D and receives a counterclockwise torque, and the rotary lever C' is subjected to the spring force of the main spring D' and receives a counterclockwise torque. Under the combined action of the rotary levers C and C', the mounting sleeve 301 is located at its maximum clockwise rotation position (i.e., the standby side power-on position).

[0040] When the standby power supply switches from the closed to the open position: slide plate 2 moves from right to left, simultaneously rotating flip levers A1 and A1' counterclockwise. When flip lever A1 rotates to the point where the line connecting the rotation centers of the flip limit linkage shaft A101 and the rotation linkage shaft C1 passes through the rotation center O of the corresponding rotation lever C, flip lever A1' also rotates to the point where the line connecting the flip limit linkage shaft A101' and the rotation linkage shaft C1' passes through the rotation center O' of the rotation lever C'. The main spring D on the normal operating side does not generate a rotational torque on the corresponding rotation lever C, thus placing the corresponding rotation lever C in a dead position. Similarly, the corresponding main spring D' on the standby side does not generate a rotational torque on the corresponding rotation lever C', thus placing the corresponding rotation lever C' in a dead position. (See attached diagram) Figure 9 As shown.

[0041] Slide 2 continues to slide slightly to the left from its dead position. At this time, the line connecting the rotation centers of the flip limit linkage shaft A101 and the rotation linkage shaft C1 is below the rotation center O of the rotating lever C, and the line connecting the flip limit linkage shaft A101' and the rotation linkage shaft C1' is above the rotation center O' of the rotating lever C'. Since the rotating linkage shaft C1' is in contact with the linkage limit part 301a0101', when the line connecting the rotating linkage shaft C1' and the flip limit linkage shaft A101' is very close to the top of the rotation center O' of the rotating lever C' (for example, about 0.5mm), the spring force of the main spring D' on the rotating lever C' is insufficient to make the rotating lever C' move forward. When rotating clockwise, the rotating lever C' remains stationary. Simultaneously, the line connecting the flip-limit linkage shaft A101 and the rotating linkage shaft C1 begins to lie below the rotation center O of the rotating lever C. Although the distance between this line and the lower part of the rotation center O of the rotating lever C is very close (e.g., about 0.5mm), since the rotating linkage shaft C1 is located within the linkage slot 301a01, there is no resistance to the rotating lever C in the clockwise direction. The rotating lever C will quickly rotate clockwise until the rotating linkage shaft C1 contacts the linkage limit part 301a0101 and then transitions to contact the linkage trigger part 301a0102. (See attached...) Figure 10 As shown, after the rotating lever C contacts the linkage trigger 301a0102, the distance between the line connecting the flip limit linkage shaft A101 and the rotating linkage shaft C1 and the lower part of the rotation center O of the rotating lever C increases. Due to the spring force of the main spring D and the rotational inertia of the rotating lever C in the clockwise direction, the rotating lever C drives the mounting sleeve 301 to rotate counterclockwise rapidly through the rotating linkage shaft C1. After the mounting sleeve 301 rotates counterclockwise, the distance between the line connecting the flip limit linkage shaft A101' and the rotating linkage shaft C1' and the upper part of the rotation center O' of the rotating lever C' increases. The rotating lever C' is overcome by the spring force of the main spring D' to overcome the friction between the rotating linkage shaft C1' and the linkage acceleration part 301a03', and the mounting sleeve 301 accelerates to rotate counterclockwise. As the slide plate 2 continues to move to the left, the flip levers A1 and A1' rotate counterclockwise simultaneously, ultimately realizing the operation mechanism from closing to opening the standby mechanism, as shown in the attached figure. Figure 10 As shown.

[0042] When the power supply on the normal operating side is in the closed state, the positions of each component are as follows: The flip lever A1 is at its maximum counterclockwise rotation angle. Since flip levers A1 and A1' are simultaneously linked to slide plate 2, flip lever A1 is at its maximum counterclockwise rotation angle. The rotating lever C is at its maximum clockwise rotation position under the action of the main spring D. The rotating lever C' is at its maximum clockwise rotation position under the action of the main spring D'. The line connecting the flip limit linkage shaft A101 and the rotating linkage shaft C1 is below the rotation center O of the rotating lever C, and the line connecting the flip limit linkage shaft A101' and the rotating linkage shaft C1' is above the rotation center O' of the rotating lever C'. At this time, the rotating lever C is subjected to the spring force of the main spring D and receives a clockwise torque, and the rotating lever C' is subjected to the spring force of the main spring D' and receives a clockwise torque. Under the combined action of the rotating levers C and C', the mounting sleeve 301 is at its maximum counterclockwise rotation position as shown in the attached figure. Figure 12 As shown.

[0043] When the power supply on the mains switches from the closed position to the open position: as shown in the attached document. Figure 13As shown, when the slide plate 2 is in the dead position, it continues to slide a small distance to the right. At this time, the line connecting the rotation centers of the flip limit linkage shaft A101 and the rotation linkage shaft C1 is above the rotation center O of the rotating lever C, and the line connecting the flip limit linkage shaft A101' and the rotation linkage shaft C1' is below the rotation center O' of the rotating lever C'. Since the rotating linkage shaft C1 is in contact with the linkage limit part 301a0101, when the distance between the line connecting the rotating linkage shaft C1 and the flip limit linkage shaft A101 and the top of the rotation center O of the rotating lever C is very close (for example, about 0.5mm), the rotating lever C is subjected to the spring force of the main spring D, which is insufficient to make the rotating lever C' rotate clockwise. The lever C remains stationary; simultaneously, the line connecting the flip-limit linkage shaft A101' and the rotary linkage shaft C1' begins to lie below the rotation center O' of the rotary lever C'. Although the distance between the line connecting the flip-limit linkage shaft A101' and the rotary linkage shaft C1' and the lower part of the rotation center O' of the rotary lever C' is very close (e.g., about 0.5mm), since the rotary linkage shaft C1' is located within the linkage slot 301a01' at this time, there is no resistance in the clockwise direction for the rotary lever C', and the rotary lever C' will quickly rotate counterclockwise until the rotary linkage shaft C1' changes from contact with the linkage limit part 301a0101' to contact with the linkage trigger part 301a0102'; as shown in the attached... Figure 14 As shown, after the rotating linkage shaft C1' contacts the linkage trigger 301a0102', the distance between the line connecting the flip limit linkage shaft A101' and the rotating linkage shaft C1' and the lower part of the rotation center O' of the rotating lever C' increases. Due to the spring force of the main spring D' and the rotational inertia of the rotating lever C' in the clockwise direction, the rotating lever C' drives the mounting sleeve 301 to rotate clockwise rapidly through the rotating linkage shaft C1'. After the mounting sleeve 301 rotates clockwise, the distance between the line connecting the rotating linkage shaft C1 and the flip limit linkage shaft A101 and the upper part of the rotation center O of the rotating lever C increases. The rotating lever C is overcome by the spring force of the main spring D', which overcomes the friction between the rotating linkage shaft C1 and the linkage acceleration part 301a03', causing the mounting sleeve 301 to accelerate and rotate clockwise. As the slide plate 2 continues to move to the right, the flip levers A1 and A1' rotate clockwise simultaneously, ultimately realizing the action of the operating mechanism from closing to opening the circuit breaker on the normal side, as shown in the attached figure. Figure 15 As shown.

[0044] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A fast tripping device for a switching device operating system, characterized in that: It includes a bracket with a common side on one side and a spare side on the other. A slide is disposed inside the bracket and can slide back and forth between the common side and the spare side. The common side and the spare side of the slide are respectively connected to corresponding flip levers. One end of the output system is rotatably mounted on the bracket, and the other end is located outside the bracket. The common side and the spare side inside the bracket are also provided with corresponding rotating levers and corresponding main springs. The output system is linked with the corresponding rotating levers and corresponding main springs on the common side and the spare side inside the bracket. The output system includes a mounting bushing, which is rotatable within a mounting through hole. The mounting bushing has corresponding linkage cantilever arms on the commonly used side and the spare side. The corresponding linkage cantilever arms have linkage slots. The corresponding rotation linkage shaft is located within the corresponding linkage slots, which causes the mounting bushing to be linked during the rotation of the corresponding rotating levers on the commonly used side and the spare side of the bracket. The linkage slot is an approximately triangular hole with an arc-shaped head. A linkage limiting part is provided inside the linkage slot near the head. A linkage triggering part and a linkage acceleration part are respectively provided on both sides of the linkage slot near the mounting bushing. When the standby power supply switches from the closed position to the open position; The rotating linkage shaft is located within the linkage slot. When the slide plate continues to move from its dead position, the rotating lever will quickly rotate clockwise until the rotating linkage shaft contacts the linkage limit part and then contacts the linkage trigger part. After the rotating lever contacts the linkage trigger part, the distance between the line connecting the flip limit linkage shaft and the rotating linkage shaft and the lower part of the rotating lever's rotation center increases. Due to the spring force of the main spring and the rotational inertia of the rotating lever in the clockwise direction, the rotating lever drives the mounting sleeve to quickly rotate counterclockwise through the rotating linkage shaft. After the mounting sleeve rotates counterclockwise, the distance between the line connecting the flip limit linkage shaft and the rotating linkage shaft and the upper part of the rotating lever's rotation center increases. The rotating lever is overcome by the spring force of the main spring, which overcomes the friction between the rotating linkage shaft and the linkage acceleration part, and the mounting sleeve accelerates the counterclockwise rotation. The bracket is provided with mounting through holes for mounting the output system, and the inner side of the bracket is provided with corresponding mounting shafts; The corresponding flip lever is rotatably mounted on the corresponding mounting shaft, and the corresponding flip lever is provided with a corresponding flip limit linkage shaft. The corresponding rotating levers on the commonly used side and the spare side of the bracket are rotatably mounted on the corresponding mounting shaft. One end of the corresponding main spring on the commonly used side and the spare side of the bracket is mounted on the corresponding flip limit linkage shaft, and the other end is mounted on the corresponding rotating linkage shaft.

2. The fast tripping device of the switching device operating system as described in claim 1, characterized in that: The corresponding flip lever is pivotally connected to the corresponding side of the slide via a corresponding slide shaft, and the corresponding rotation lever is linked to the output system via a corresponding rotation linkage shaft.

3. The fast tripping device of the switching device operating system as described in claim 1, characterized in that: The bracket includes a pair of side plates, which are connected and fixed together by a number of bracket connecting shafts.

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