Double-door-plate structure of high-pressure gas-insulated switchgear

Abstract

The utility model relates to a double-door plate structure of a high-voltage gas-insulated switchgear, which is better in use safety, high in space utilization rate of the high-voltage gas-insulated switchgear, good in cabinet door locking force and convenient to operate, and is characterized in that a first cabinet door is arranged at a lower doorway at the front side in a cable chamber of the high-voltage gas-insulated switchgear; an observation window is arranged on the first cabinet door, explosion-proof glass is installed on the observation window, a second cabinet door is arranged at the front side lower door opening and located on the inner side of the first cabinet door, and a plurality of inclined square holes are formed in the second cabinet door and penetrate through the front face and the back face of the second cabinet door. When the first cabinet door and the second cabinet door are both in a closed state, the multiple inclined square holes directly face the observation window, and first explosion-proof glass is installed on the inner side faces of the multiple inclined square holes through fixing pieces. The double-door plate structure of the high-pressure gas-insulated switchgear has the advantages that the use safety is better, and the space utilization rate of the high-pressure gas-insulated switchgear is high; and secondly, the double-door plate structure of the high-voltage gas-insulated switchgear is not only good in locking force of the cabinet door, but also convenient to operate.

Description

Technical Field

[0001] The utility model belongs to the technical field of high-voltage gas-insulated switchgear manufacturing, and particularly relates to a double-door panel structure for a high-voltage gas-insulated switchgear. Background Technique

[0002] The existing cabinet door structure of a high-voltage gas-insulated switchgear, such as CN 206506219 U, with the name "A High-Voltage Gas-Insulated Switchgear", includes a high-voltage gas-insulated switchgear body, a wiring cabinet body, and an alarm device; the high-voltage gas-insulated switchgear body is fixedly installed on the top of the wiring cabinet body, and a high-voltage gas-insulated switchgear door and a wiring cabinet door are respectively hinged to the fronts of the high-voltage gas-insulated switchgear body and the wiring cabinet body through hinges; an inflation device is arranged inside the wiring cabinet body, and the air outlet end of the inflation device is communicated with the high-voltage gas-insulated switchgear body through a pipeline; an electrical component mounting rack and a pressure sensor are arranged inside the high-voltage gas-insulated switchgear body; a control box is arranged at the upper end of the high-voltage gas-insulated switchgear body, and a control box door is hinged to the front of the control box; an alarm device and an operation screen are arranged on the control box door; a power supply device, a processor, a data comparator, and a feedback module are respectively arranged inside the control box, and the output ends of the processor and the pressure sensor are respectively electrically connected to the input end of the data comparator; the output end of the pressure sensor is electrically connected to the input end of the processor through the feedback module; the output end of the power supply device is respectively electrically connected to the input ends of the pressure sensor and the processor, and the output end of the processor is electrically connected to the input end of the inflation device; the operation screen is in a two-wire electrical connection with the processor, and the processor is wirelessly connected to the staff's mobile terminal through a wireless transceiver module arranged inside the control box. At least two groups of the high-voltage gas-insulated switchgear body and the wiring cabinet body are provided, and they are horizontally fixedly connected through bolts. Electromagnetic locks and handles are respectively arranged on the high-voltage gas-insulated switchgear door and the wiring cabinet door, and the electromagnetic locks are powered by the power supply device. A ventilation window is opened on the wiring cabinet door. The operation screen is a capacitive touch operation screen. The alarm device includes an alarm lamp and a buzzer, and the input ends of the alarm lamp and the buzzer are respectively electrically connected to the output end of the processor; the pressure sensor is an HM300 series pressure sensor; the processor is an ARM9 series processor; the data comparator is an LM211D model data comparator. For this kind of high-voltage gas-insulated switchgear, the cabinet door structure in its cable chamber includes a cabinet door and an electromagnetic lock located at the lower front door of the cable chamber. The locking strength of this kind of cabinet door structure with a single door and an electromagnetic lock is relatively weak when it is in the locked state. After being used for a period of time, its strength may even be lower than the installation strength of the pressure relief plate on the back of the cable chamber (a designed weak point, when the air pressure in the cable chamber increases, the pressure relief plate will be broken through first for pressure relief) and the pressure relief plate on the bottom surface of the cable chamber (a designed weak point, when the air pressure in the cable chamber increases, the pressure relief plate will be broken through first for pressure relief). At this time, when a short-circuit fault (such as single-phase grounding) occurs in the cable chamber, the air pressure increases instantaneously when the fault arc burns in the cable chamber, and what may be broken through first is the cabinet door. There is a risk that the fault arc in the cable chamber leaks from the front lower door, that is, the safety of use of the existing cabinet door structure of the high-voltage gas-insulated switchgear is relatively poor. Utility Model Content

[0003] Design purpose: To avoid the deficiencies in the background technology, a double-door structure for a high-voltage gas-insulated switchgear is designed, which not only has better use safety, but also has high space utilization rate of the high-voltage gas-insulated switchgear, and at the same time has good locking force of the cabinet door and is convenient to operate.

[0004] Design solution: To achieve the above design purpose.

[0005] 1. A second cabinet door is provided at the lower front door opening, and the second cabinet door is located inside the first cabinet door. A plurality of rhomboid holes are provided on the second cabinet door, and the rhomboid holes penetrate through the front and back sides of the second cabinet door. When the first cabinet door and the second cabinet door are both in the closed state, the plurality of rhomboid holes are aligned with the observation window. The inner sides of the plurality of rhomboid holes are installed with a first explosion-proof glass through fixing parts. This design is one of the technical features of the present invention. The purpose of this design is as follows: A second cabinet door is provided at the lower front door opening, and the second cabinet door is located inside the first cabinet door. A plurality of rhomboid holes are provided on the second cabinet door, and the rhomboid holes penetrate through the front and back sides of the second cabinet door. When the first cabinet door and the second cabinet door are both in the closed state, the plurality of rhomboid holes are aligned with the observation window. The inner sides of the plurality of rhomboid holes are installed with a first explosion-proof glass. The "double-door" structure of the cable chamber reduces the risk of leakage of the fault arc in the cable chamber from the front lower door and improves safety; in addition, the combined design of the rhomboid holes and the observation window can observe the internal working conditions of the high-voltage gas-insulated switchgear on the premise of ensuring the use strength of a double-door structure for a high-voltage gas-insulated switchgear (when the product is running, the operating states of the primary cables and current transformers and other main components inside the cable chamber can be observed).

[0006] 2. A door handle is provided on the outer side of the second cabinet door. The door handle is composed of two fixed columns, a C-shaped handle rod, and two pin shafts. One fixed column is fixedly installed on each outer side of the second cabinet door. A circular groove is provided on the outer end face of the fixed column, and the symmetric center line of the circular groove coincides with the symmetric center line of the fixed column. A notch is provided on the lower side of the fixed column, and the notch communicates with the circular groove. The width of the notch matches the diameter of the C-shaped handle rod. A pin shaft through hole is provided at each of the two side ends of the C-shaped handle rod. A pin shaft hole penetrating both side faces of the fixed column is provided on the fixed column, and the pin shaft hole passes through the circular groove. The two side ends of the C-shaped handle rod are inserted and matched with the corresponding circular grooves, and after the pin shaft through holes are aligned with the corresponding pin shaft holes, the C-shaped handle rod is pin-connected to the fixed column through the pin shafts. The design that the two side ends of the pin shaft are welded and fixed to the orifices of the pin shaft holes is the second technical feature of the present utility model. The purpose of this design is as follows: A door handle is provided on the outer side of the second cabinet door. The door handle is composed of two fixed columns, a C-shaped handle rod, and two pin shafts. One fixed column is fixedly installed on each outer side of the second cabinet door. A circular groove is provided on the outer end face of the fixed column, and the symmetric center line of the circular groove coincides with the symmetric center line of the fixed column. A notch is provided on the lower side of the fixed column, and the notch communicates with the circular groove. The width of the notch matches the diameter of the C-shaped handle rod. A pin shaft through hole is provided at each of the two side ends of the C-shaped handle rod. A pin shaft hole penetrating both side faces of the fixed column is provided on the fixed column, and the pin shaft hole passes through the circular groove. The two side ends of the C-shaped handle rod are inserted and matched with the corresponding circular grooves, and after the pin shaft through holes are aligned with the corresponding pin shaft holes, the C-shaped handle rod is pin-connected to the fixed column through the pin shafts. The two side ends of the pin shaft are welded and fixed to the orifices of the pin shaft holes; when the second cabinet door is in the closed state, the door handle can be rotated down, and when the door needs to be opened, the user can rotate the C-shaped handle rod up. This can greatly reduce the space required to be reserved between the first cabinet door and the second cabinet door, thereby improving the space utilization rate of the high-voltage gas-insulated switchgear.

[0007] 3. The design that a convex portion formed by stamping is provided in the middle of the first cabinet door is the third technical feature of the present utility model. The purpose of this design is as follows: A convex portion formed by stamping is provided in the middle of the first cabinet door, and the door panel adopts a three-dimensional convex design to increase the structural strength of the outer door and improve the safety of structural protection.

[0008] 4. The first cabinet door is provided with a zip fastener, which is composed of a C-shaped handle rod 1, two movable columns, two pin shafts 1, two nuts and a hook lock piece; two vertically arranged strip-shaped through holes are provided on the outer side surface of the first cabinet door, and the two strip-shaped through holes penetrate through the inner and outer side surfaces of the first cabinet door. The hook lock piece is L-shaped. Two lock piece through holes are provided on the mounting plate of the hook lock piece, and the lock piece through holes penetrate through the front and back sides of the hook lock piece. Two lock hooks are provided on the locking plate of the hook lock piece, and the hook heads of the lock hooks face downward. The movable column is composed of a first column section and a second column section, and the symmetry center line of the first column section coincides with the symmetry center line of the second column section. The diameter of the first column section is larger than that of the second column section, and the diameter of the second column section matches the width of the strip-shaped through hole. The diameter of the lock piece through hole matches the width of the strip-shaped through hole. A circular groove 1 is provided on the outer end surface of the first column section, and the symmetry center line of the circular groove 1 coincides with the symmetry center line of the first column section. A notch 1 is provided on the lower side of the first column section, and the notch 1 communicates with the circular groove 1. The width of the notch 1 matches the diameter of the C-shaped handle rod 1. A pin shaft through hole 1 is provided at each of the two end heads of the C-shaped handle rod 1. A pin shaft hole 1 penetrating through the two side surfaces of the first column section is provided on the first column section, and the pin shaft hole 1 passes through the circular groove 1. The tail end of the second column section is a threaded end. After the two lock piece through holes of the hook lock piece are aligned with the corresponding strip-shaped through holes, the hook lock piece is installed on the inner side surface of the first cabinet door through the movable column and the nut. The hook lock piece can move up and down relative to the first cabinet door within the length range of the strip-shaped through hole. After the two end heads of the C-shaped handle rod 1 are inserted into the corresponding circular grooves 1 and the pin shaft through hole 1 is aligned with the corresponding pin shaft hole 1, the C-shaped handle rod 1 is pin-connected with the first column section through the pin shaft 1. The design that the two end heads of the pin shaft 1 are welded and fixed to the orifices of the pin shaft hole 1 is the fourth technical feature of the present utility model.The purpose of such a design is as follows: The first cabinet door is provided with a zip fastener, which is composed of a C-shaped handle rod one, two movable columns, two pin shafts one, two nuts and a hook lock piece; The outer side surface of the first cabinet door is provided with two vertically arranged strip-shaped through holes, and the two strip-shaped through holes penetrate through the inner and outer side surfaces of the first cabinet door. The hook lock piece is L-shaped. The mounting plate of the hook lock piece is provided with two lock piece through holes, and the lock piece through holes penetrate through the front and back sides of the hook lock piece. The locking plate of the hook lock piece is provided with two lock hooks, and the hook heads of the lock hooks face downward. The movable column is composed of a first column section and a second column section, and the symmetry center line of the first column section coincides with the symmetry center line of the second column section. The diameter of the first column section is greater than the diameter of the second column section, and the diameter of the second column section matches the width of the strip-shaped through hole. The diameter of the lock piece through hole matches the width of the strip-shaped through hole. The outer end surface of the first column section is provided with a circular groove one, and the symmetry center line of the circular groove one coincides with the symmetry center line of the first column section. A notch one is provided on the lower side of the first column section, and the notch one communicates with the circular groove one. The width of the notch one matches the diameter of the C-shaped handle rod one. A pin shaft through hole one is respectively provided at both ends of the C-shaped handle rod one. A pin shaft hole one penetrating through both side surfaces of the first column section is provided on the first column section, and the pin shaft hole one passes through the circular groove one. The tail end of the second column section is a threaded end. After the two lock piece through holes of the hook lock piece are aligned with the corresponding strip-shaped through holes, the hook lock piece is installed on the inner side surface of the first cabinet door through the movable column and the nut. The hook lock piece can move up and down relative to the first cabinet door within the length range of the strip-shaped through hole. When the two ends of the C-shaped handle rod one are inserted into the corresponding circular groove one and the pin shaft through hole one is aligned with the corresponding pin shaft hole one, the C-shaped handle rod one is pin-connected to the first column section through the pin shaft one. The two ends of the pin shaft one are welded and fixed to the orifices of the pin shaft hole one. When the user needs to open the first cabinet door, the user holds the C-shaped handle rod one and lifts it. At this time, the hook lock piece moves upward relative to the first cabinet door, so that the two lock hooks are completely aligned with the corresponding door frame through holes on the door frame. Then the user pulls the C-shaped handle rod one outwards. At this time, the two lock hooks withdraw from the corresponding through holes, and the first cabinet door is opened. Such a zip fastener structure can not only improve the safety locking force of the door, but also be convenient for operation, and can quickly open the cabinet door for maintenance, so as to shorten the power outage maintenance time of the high-voltage cabinet and reduce the losses of users.

[0009] Technical solution: A double-door plate structure of a high-voltage gas-insulated switchgear, including a cable chamber of the high-voltage gas-insulated switchgear. A first cabinet door is provided at the lower front door opening in the cable chamber of the high-voltage gas-insulated switchgear. An observation window is provided on the first cabinet door, and an explosion-proof glass is installed on the observation window. A second cabinet door is provided at the lower front door opening, and the second cabinet door is located inside the first cabinet door. A plurality of rhomboid holes are provided on the second cabinet door, and the rhomboid holes penetrate through the front and back sides of the second cabinet door. When the first cabinet door and the second cabinet door are both in a closed state, the plurality of rhomboid holes are aligned with the observation window. An explosion-proof glass one is installed on the inner side surfaces of the plurality of rhomboid holes through a fixing member.

[0010] Compared with the background art, the utility model has the following advantages: firstly, a double-door structure of a high-voltage gas-insulated switchgear has better safety in use and higher space utilization rate of the high-voltage gas-insulated switchgear; secondly, a double-door structure of a high-voltage gas-insulated switchgear has good locking force of the cabinet door and is convenient to operate. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a schematic structural diagram of a double-door structure of a high-voltage gas-insulated switchgear.

[0012] Figure 2 is Figure 1 An enlarged view of the circle A in

[0013] Figure 3 It is a schematic structural diagram of a double-door structure of a high-voltage gas-insulated switchgear (with the first cabinet door removed).

[0014] Figure 4 is Figure 3 An enlarged view of the circle B in

[0015] Figure 5 It is a schematic side view structure diagram of a hook lock piece.

[0016] Figure 6 It is a schematic front view structure diagram of a hook lock piece.

[0017] Figure 7 It is a physical object of a double-door structure of a high-voltage gas-insulated switchgear Figure 1 .

[0018] Figure 8 It is a physical object of a double-door structure of a high-voltage gas-insulated switchgear Figure 2 . DETAILED DESCRIPTION OF THE EMBODIMENTS

[0019] Embodiment 1: Refer to the attached Figures 1 - 8 . A double-door structure of a high-voltage gas-insulated switchgear includes a cable chamber 1 of the high-voltage gas-insulated switchgear. A first cabinet door 2 is provided at the lower front door opening in the cable chamber 1 of the high-voltage gas-insulated switchgear. An observation window 21 is provided on the first cabinet door 2, and an explosion-proof glass 22 is installed on the observation window 21. A second cabinet door 3 is provided at the lower front door opening, and the second cabinet door 3 is located inside the first cabinet door 2. A plurality of rhombic holes 31 are provided on the second cabinet door 3, and the plurality of rhombic holes 31 penetrate through the front and back sides of the second cabinet door 3. When the first cabinet door 2 and the second cabinet door 3 are both in a closed state, the plurality of rhombic holes 31 are aligned with the observation window 21. An explosion-proof glass one is installed on the inner side surfaces of the plurality of rhombic holes 31 through fixing members. The side length of each of the rhombic holes 31 is 20 mm.

[0020] The outer side of the second cabinet door 3 is provided with a door handle 4. An electromagnetic lock can be provided on the second cabinet door 3, or a linkage lock can be provided on the second cabinet door 3. The linkage lock can only open the second cabinet door 3 after the circuit breaker is tripped, the disconnecting switch is tripped, and the earthing switch is closed, ensuring the safety of the operator. Since the linkage lock is a prior art, it will not be further described herein. The door handle 4 is composed of two fixed columns 41, a C-shaped handle rod 42 and two pin shafts. One fixed column 41 is fixedly installed on the outer side of the second cabinet door 3 respectively. A circular groove 43 is provided on the outer end face of the fixed column 41, and the symmetric center line of the circular groove 43 coincides with the symmetric center line of the fixed column 41. A notch 44 is provided on the lower side of the fixed column 41, and the notch 44 communicates with the circular groove 43. The width of the notch 44 matches the diameter of the C-shaped handle rod 42. A pin shaft through hole is provided at each of the two side ends of the C-shaped handle rod 42. A pin shaft hole penetrating through both side faces of the fixed column 41 is provided on the fixed column 41, and the pin shaft hole passes through the circular groove 43. The C-shaped handle rod 42 is inserted and matched with the corresponding circular groove 43 at both side ends of the C-shaped handle rod 42. After the pin shaft through hole is aligned with the corresponding pin shaft hole, the C-shaped handle rod 42 is pin-connected to the fixed column 41 through a pin shaft. The two side ends of the pin shaft are fixedly welded to the orifice of the pin shaft hole. A convex portion 23 formed by stamping is provided in the middle of the first cabinet door 2.

[0021] The first cabinet door 2 is provided with a zip fastener 5, which is composed of a C-shaped handle rod 51, two movable columns 52, two first pins, two nuts and a hook lock piece 53; two vertically arranged strip-shaped through holes 24 are provided on the outer side surface of the first cabinet door 2, and the two strip-shaped through holes 24 penetrate through the inner and outer side surfaces of the first cabinet door 2. The hook lock piece 53 is L-shaped. Two lock piece through holes 54 are provided on the mounting plate of the hook lock piece 53, and the lock piece through holes 54 penetrate through the front and back sides of the hook lock piece 53. Two lock hooks 55 are provided on the locking plate of the hook lock piece 53, and the hook heads of the lock hooks 55 face downward. The movable column 52 is composed of a first column section and a second column section, and the symmetry center line of the first column section coincides with the symmetry center line of the second column section. The diameter of the first column section is larger than that of the second column section, and the diameter of the second column section matches the width of the strip-shaped through hole 24. The diameter of the lock piece through hole 54 matches the width of the strip-shaped through hole 24. A first circular groove 56 is provided on the outer end surface of the first column section, and the symmetry center line of the first circular groove 56 coincides with the symmetry center line of the first column section. A first notch 57 is provided on the lower side of the first column section, and the first notch 57 communicates with the first circular groove 56. The width of the first notch 57 matches the diameter of the C-shaped handle rod 51. A first pin through hole is provided at each of the two end heads of the C-shaped handle rod 51. A first pin hole penetrating through the two side surfaces of the first column section is provided on the first column section, and the first pin hole passes through the first circular groove 56. The tail end of the second column section is a threaded end. After the two lock piece through holes 54 of the hook lock piece 53 are aligned with the corresponding strip-shaped through holes 24, the hook lock piece 53 is installed on the inner side surface of the first cabinet door 2 through the movable column 52 and the nut. The hook lock piece 53 can move up and down relative to the first cabinet door 2 within the length range of the strip-shaped through hole 24. After the two end heads of the C-shaped handle rod 51 are inserted into the corresponding first circular grooves 56 and the first pin through holes are aligned with the corresponding first pin holes, the C-shaped handle rod 51 is pin-connected to the first column section through the first pin. The two end heads of the first pin are welded and fixed to the orifices of the first pin hole. The lock hook 55 can be locked with the corresponding door frame through hole 6 on the door frame.

[0022] It should be understood that: Although the above embodiments have made relatively detailed written descriptions of the design concept of the present invention, these written descriptions are only simple written descriptions of the design concept of the present invention, rather than limitations on the design concept of the present invention. Any combination, addition or modification that does not exceed the design concept of the present invention falls within the protection scope of the present invention.

Claims

1. A double-door structure for a high-voltage gas-insulated switchgear, comprising a cable chamber (1) of the high-voltage gas-insulated switchgear. A first cabinet door (2) is provided at the lower front door opening in the cable chamber (1) of the high-voltage gas-insulated switchgear. An observation window (21) is provided on the first cabinet door (2), and an explosion-proof glass (22) is installed on the observation window (21). It is characterized in that: A second cabinet door (3) is provided at the front lower doorway, and the second cabinet door (3) is located inside the first cabinet door (2). A plurality of rhomboid holes (31) are provided on the second cabinet door (3), and the rhomboid holes (31) penetrate through the front and back sides of the second cabinet door (3). When both the first cabinet door (2) and the second cabinet door (3) are in a closed state, the plurality of rhomboid holes (31) are facing the observation window (21). An explosion-proof glass one is installed on the inner side surfaces of the plurality of rhomboid holes (31) through fixing members.

2. The double-door panel structure of a high-voltage gas-insulated switchgear according to claim 1, characterized in that: The side lengths of the rhomboid holes (31) are all 20 mm.

3. A double-door structure of a high-voltage gas-insulated switchgear according to claim 1 or 2, characterized in that: A door handle (4) is provided on the outer side surface of the second cabinet door (3). The door handle (4) is composed of two fixing columns (41), a C-shaped handle rod (42), and two pin shafts. One fixing column (41) is fixedly installed on the outer side surface of the second cabinet door (3) respectively. A circular groove (43) is provided at the outer end surface of the fixing column (41), and the symmetric center line of the circular groove (43) coincides with the symmetric center line of the fixing column (41). A notch (44) is provided below the fixing column (41), and the notch (44) communicates with the circular groove (43). The width of the notch (44) matches the diameter of the C-shaped handle rod (42). A pin shaft through hole is provided at each of the two side ends of the C-shaped handle rod (42). A pin shaft hole penetrating through the two side surfaces of the fixing column (41) is provided on the fixing column (41), and the pin shaft hole passes through the circular groove (43). The C-shaped handle rod (42) is inserted and matched with the corresponding circular groove (43) at the two side ends of the C-shaped handle rod (42). After the pin shaft through hole is aligned with the corresponding pin shaft hole, the C-shaped handle rod (42) is pin-connected to the fixing column (41) through a pin shaft. The two side ends of the pin shaft are fixedly welded to the orifice of the pin shaft hole.

4. A double-door structure of a high-voltage gas-insulated switchgear according to claim 1, characterized in that: A raised portion (23) formed by stamping is provided in the middle of the first cabinet door (2).

5. The double-door panel structure of a high-voltage gas-insulated switchgear according to claim 1, characterized in that: The first cabinet door (2) is provided with a zip fastener (5), which is composed of a C-shaped handle rod one (51), two movable columns (52), two first pins, two nuts and a hook lock piece (53); two vertically arranged strip-shaped through holes (24) are provided on the outer side surface of the first cabinet door (2), and the two strip-shaped through holes (24) penetrate through the inner and outer side surfaces of the first cabinet door (2). The hook lock piece (53) is L-shaped. Two lock piece through holes (54) are provided on the mounting plate of the hook lock piece (53), and the lock piece through holes (54) penetrate through the front and back sides of the hook lock piece (53). Two lock hooks (55) are provided on the locking plate of the hook lock piece (53), and the hook heads of the lock hooks (55) face downward. The movable column (52) is composed of a first column section and a second column section, and the symmetry center line of the first column section coincides with the symmetry center line of the second column section. The diameter of the first column section is larger than that of the second column section, and the diameter of the second column section matches the width of the strip-shaped through hole (24). The diameter of the lock piece through hole (54) matches the width of the strip-shaped through hole (24). A circular groove one (56) is provided on the outer end surface of the first column section, and the symmetry center line of the circular groove one (56) coincides with the symmetry center line of the first column section. A notch one (57) is provided on the lower side of the first column section, and the notch one (57) communicates with the circular groove one (56). The width of the notch one (57) matches the diameter of the C-shaped handle rod one (51). A first pin through hole is provided at each of the two end heads of the C-shaped handle rod one (51). A first pin hole penetrating through the two side surfaces of the first column section is provided on the first column section, and the first pin hole passes through the circular groove one (56). The tail end of the second column section is a threaded end. After the two lock piece through holes (54) of the hook lock piece (53) are aligned with the corresponding strip-shaped through holes (24), the hook lock piece (53) is installed on the inner side surface of the first cabinet door (2) through the movable column (52) and the nut. The hook lock piece (53) can move up and down relative to the first cabinet door (2) within the length range of the strip-shaped through hole (24). After the two end heads of the C-shaped handle rod one (51) are inserted and matched with the corresponding circular groove one (56) and the first pin through holes are aligned with the corresponding first pin holes, the C-shaped handle rod one (51) is pin-connected with the first column section through the first pin. The two end heads of the first pin are welded and fixed to the orifices of the first pin holes.

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