A battery cabinet for communication facilities that is easy to maintain

Abstract

The present invention discloses a battery cabinet for communication facilities which is easy to maintain and belongs to the technical field of communication equipment. The cabinet comprises a cabinet body, a mounting mechanism and a moving mechanism. The interior of the cabinet body is hollow, and the mounting mechanism and the moving mechanism are mounted in the cabinet body. The mounting mechanism is provided with a storage battery, and the moving mechanism is provided with a moving component. The storage battery is driven to descend to a certain height through the moving component. A rear rotating door, a side rotating door and a front rotating door are provided on the side of the cabinet body. The storage battery is inspected and repaired through the rear rotating door, the side rotating door and the front rotating door, and the power supply of the battery cabinet is automatically disconnected to avoid damage to maintenance personnel during the maintenance process; the battery pack is automatically lowered to a maintenance window, and the battery pack can be taken out through the maintenance window to avoid a large number of parts occupying the work platform space.

Description

Technical Field

[0001] The present invention relates to the technical field of communication equipment, and in particular to a battery cabinet for communication facilities which is easy to maintain. Background Art

[0002] The battery cabinet is specially designed and manufactured by the factory for the performance test and cycle life test of rechargeable power batteries, and is particularly suitable for use in the R&D department. It can detect all types of batteries such as single or combined nickel-cadmium, nickel-metal hydride, lithium-ion and lithium polymer. With the continuous improvement of the current scientific and technological level, the communication industry has also developed rapidly. With the rapid popularization of the communication industry, various communication facilities have been continuously applied to different regions. Therefore, in order to ensure the stable operation of such communication facilities, battery cabinets must be placed aside to provide them with stable working voltage. In some remote areas and places with low signals, communication facilities are often built outdoors to receive signals. At this time, the communication facilities need a separate battery cabinet to power them. Because they are outdoors and the environmental factors are poor, the battery cabinets need to be frequently inspected and maintained to ensure normal power supply.

[0003] The Chinese invention patent with announcement number CN106876625B discloses a battery cabinet that is easy to maintain and used for powering outdoor communication facilities. The technical solution of the invention is: including a cabinet door, a cabinet body, a central control mechanism, a battery placement mechanism and a lifting mechanism. The lifting mechanism includes a fixed plate, a support assembly, a first drive assembly and a second drive assembly. The first drive assembly includes a first support, a first motor and a first traction rope. The second drive assembly includes a second support, a second motor and a second traction rope. The battery placement mechanism includes a placement plate and a placement assembly. The placement unit includes a third support, a limit plate and a limit unit. In the battery cabinet that is easy to maintain and used for powering outdoor communication facilities, the cabinet body can be reliably lifted and lowered by the lifting mechanism, which improves the maintenance efficiency of the battery cabinet by the staff and improves the practicality of the battery cabinet; the battery placement mechanism can realize flexible installation of the battery and improves the practicality of the battery cabinet. However, the invention needs to remove most of the components when repairing the distribution cabinet. In this process, a large number of parts are added to the workbench, which will result in too small a working space. Therefore, a battery cabinet that is easy to maintain for communication facilities is invented to address this defect. Summary of the invention

[0004] In view of the above technical problems, the technical solution adopted by the present invention is: a battery cabinet for communication facilities that is easy to maintain, including a cabinet body, an installation mechanism and a moving mechanism. The interior of the cabinet body is hollow, and the cabinet body is provided with a front panel, a rear panel and a side panel. There are two side panels, one side of the two side panels is fixedly installed on the inner side of the front panel, and the other side of the two side panels is fixedly installed on the inner side of the rear panel. Rectangular through holes are provided on the side surfaces of each front panel, rear panel and side panel, and the upper surfaces of each through hole overlap with each other, and the lower surfaces of each through hole overlap with each other.

[0005] A track groove is arranged on the inner side of each side plate, and the mounting mechanism is provided with a battery seat, which is slidably mounted in the track groove, and a plurality of storage batteries are mounted on the battery seat, and the storage batteries are connected to the elastic power connection assembly.

[0006] The cabinet is also provided with a side rotating door, and there are two side rotating doors. The two side rotating doors are respectively rotatably installed in the rectangular through holes on the side of each side plate. The moving mechanism is provided with a motion component, and the motion component is connected to the side rotating door. The motion component is installed inside the cabinet, and the motion component is also connected to the battery holder.

[0007] Furthermore, the elastic power connection component is provided with a junction box, in which the positive and negative connecting wires of each battery are installed, and a plurality of connecting cylinders are fixedly installed on the side of the junction box, the interior of the connecting cylinder is hollow, and a spring shaft is slidably installed on the inner wall of the connecting cylinder, and a spring is wound on the outer surface of the spring shaft, one end of the spring on the outer surface of the spring shaft is fixedly installed on the inner wall of the connecting cylinder, and the other end of the spring on the outer surface of the spring shaft is fixedly installed on the outer surface of the spring shaft, the interior of the spring shaft is hollow, and a contact head is fixedly installed on the inner wall of the spring shaft, and the contact head is connected to the positive and negative connecting wires of the battery.

[0008] Furthermore, a wiring groove is provided on the inner side of the rear plate, and two copper plates are fixedly installed in the wiring groove. An electrical connection port is provided on the outer side of the rear plate, and the electrical connection port is connected to the two copper plates; the contact head is provided with two protrusions, and the two protrusions of the contact head are respectively connected to the positive and negative pole connection wires of the battery, and the two protrusions of the contact head are respectively slidably connected to the two copper plates.

[0009] Furthermore, the track groove is smoothly connected by a groove with a center line obliquely downward and a groove with a center line vertical, and the lateral length of the groove obliquely downward is greater than the distance between the protruding end face of the contact head and the side of the junction box when the spring of the spring shaft is not under force.

[0010] Furthermore, the moving component is provided with a telescopic shaft, a connecting slot rod and a horizontal slot block, the telescopic shaft is fixedly and slidably installed on the lower side of the cabinet, the telescopic part of the telescopic shaft is fixedly installed on the lower side of the battery seat, the junction box is fixedly installed on the upper side of the battery seat, a cylindrical protrusion is provided on the side of the junction box, a slide groove is provided on the side of the connecting slot rod, the cylindrical protrusion of the junction box is slidably installed in the slide groove of the connecting slot rod, and a fixed block is rotatably installed at one end of the connecting slot rod away from the junction box, the fixed block is slidably installed on the horizontal slot block, the horizontal slot block is fixedly installed on the inner side of the side panel, and a connecting block is also slidably installed on the horizontal slot block, the connecting block is fixedly installed on the side of the fixed block, a cylindrical protrusion is provided on the upper surface of the connecting block, the outer surface of the cylindrical protrusion of the connecting block is rotatably connected to one end of the telescopic connecting rod, and the other end of the telescopic connecting rod is rotatably installed on the inner side of the side rotating door.

[0011] Furthermore, a horizontal groove is provided on the inner side of the side plate, the center line of the horizontal groove is in the horizontal direction, the lateral length of the horizontal groove is greater than the lateral length of the downwardly inclined groove of the track groove, and a sliding block is slidably installed on the inner side of the horizontal groove, and the sliding block is fixedly installed with the connecting groove rod.

[0012] Furthermore, the upper surface of the horizontal slot block and the upper surface of the telescopic shaft fixing portion are both located below the lower surface of the rectangular through hole of the side plate.

[0013] Furthermore, the motion component is also provided with a vertical track and a first connecting rod. The vertical track is fixedly installed inside the cabinet. The vertical track is formed by vertically connecting a section of vertical track and a section of horizontal track. A first sliding seat is slidably installed in the vertical track of the vertical track, and a second sliding seat is slidably installed in the horizontal track of the vertical track. The first sliding seat is rotatably connected to one end of the first connecting rod, and the other end of the first connecting rod is rotatably installed on the lower side of the battery seat. The first sliding seat is also rotatably connected to one end of the second connecting rod, and the other end of the second connecting rod is rotatably connected to the second sliding seat.

[0014] Compared with the prior art, the present invention has the following advantages: (1) The present invention is provided with an elastic power connection component to automatically disconnect the power supply of the battery cabinet, thereby avoiding harm to maintenance personnel during maintenance, thereby ensuring the safety of maintenance personnel; (2) The present invention is provided with a motion component to automatically lower the battery pack to the maintenance window, through which the battery pack can be taken out, thereby avoiding a large number of parts occupying the work platform space; (3) The present invention achieves a close fit of the power supply part through the cooperation of the elastic power connection component and the motion component, thereby avoiding the occurrence of power failure of the line caused by looseness due to excessive working time. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0016] Figure 2 It is a schematic diagram of the overall structure of the cabinet of the present invention.

[0017] Figure 3 It is a side view of the internal structure of the cabinet of the present invention.

[0018] Figure 4 This is a front view of the internal structure of the cabinet of the present invention

[0019] Figure 5 FIG. 2 is a schematic diagram of the overall structure of the elastic electrical connection assembly of the present invention.

[0020] Figure 6 for Figure 5 A partial enlarged schematic diagram in the middle.

[0021] Figure 7 for Figure 5 A partial enlarged schematic diagram of point B in the middle.

[0022] Figure 8 It is a schematic diagram of the overall structure of the motion component of the present invention.

[0023] Fig. 9 for Figure 8 A partial enlarged schematic diagram of point C in the middle.

[0024] Fig.10 It is a schematic diagram of the connection relationship between the motion component and the junction box of the present invention.

[0025] Fig.11 It is a schematic diagram of the connection relationship between the second sliding seat and the push rod of the present invention.

[0026] Fig.12 It is a schematic diagram of the connection relationship between the battery holder and the telescopic shaft of the present invention.

[0027] Figure numerals: 1-cabinet; 2-installation mechanism; 3-moving mechanism; 101-front plate; 102-top plate; 103-rear plate; 104-rear rotating door; 105-blocking piece; 106-side rotating door; 107-side plate; 108-bottom plate; 109-front rotating door; 201-battery holder; 202-battery; 203-clamping plate; 204-junction box; 205-connecting cylinder; 206-spring shaft; 207-contact head; 208-copper Plate; 209-wiring slot; 301-telescopic shaft; 302-sliding block; 303-track slot; 304-horizontal slot; 305-vertical track; 306-roller frame; 307-roller; 308-connecting slot rod; 309-first connecting rod; 310-first sliding seat; 311-second connecting rod; 312-second sliding seat; 313-push rod; 314-telescopic connecting rod; 315-connecting block; 316-fixed block; 317-horizontal slot block. DETAILED DESCRIPTION

[0028] The technical solution of the present invention is further explained below in combination with and through specific implementation methods.

[0029] As attached Figure 1 ~Attached Fig.10 As shown, the cabinet 1 is hollow inside, and is provided with a front panel 101, a rear panel 103 and a side panel 107. Two side panels 107 are provided, one side of the two side panels 107 is fixedly mounted on the inner side of the front panel 101, and the other side of the two side panels 107 is fixedly mounted on the inner side of the rear panel 103. A rectangular through hole is provided on the side of each of the front panel 101, the rear panel 103 and the side panel 107, and the upper and lower surfaces of each through hole overlap; a track groove 303 is provided on the inner side of each side panel 107, and the mounting mechanism 2 is provided with a battery holder 201 A plurality of clamping plates 203 are fixedly mounted on the battery holder 201, a battery 202 is mounted on each clamping plate 203, and the battery 202 is connected to the elastic power connection component; the cabinet 1 is also provided with a side rotating door 106, and two side rotating doors 106 are provided. The two side rotating doors 106 are respectively rotatably mounted in the rectangular through holes on the side of each side plate 107, and the moving mechanism 3 is provided with a motion component, which is connected to the side rotating door 106, and the motion component is installed inside the cabinet 1, and the motion component is also connected to the battery holder 201.

[0030] As attached Figure 2 ~Attached Fig.11 As shown, the elastic connection assembly is provided with a junction box 204, and the junction box 204 is equipped with positive and negative connection wires of each battery 202. A plurality of connection cylinders 205 are fixedly installed on the side of the junction box 204. The connection cylinder 205 is hollow inside, and a spring shaft 206 is slidably installed on the inner wall of the connection cylinder 205. A spring is wound on the outer surface of the spring shaft 206. One end of the spring on the outer surface of the spring shaft 206 is fixedly installed on the inner wall of the connection cylinder 205, and the other end of the spring on the outer surface of the spring shaft 206 is fixedly installed on the outer surface of the spring shaft 206. The spring shaft 206 is hollow inside, and a contact head 207 is fixedly installed on the inner wall of the spring shaft 206. The contact head 207 and the positive and negative connection wires of the battery 202 are connected. connected; a wiring groove 209 is provided on the inner side of the rear plate 103, and two copper plates 208 are fixedly installed in the wiring groove 209, and an electrical connection port is provided on the outer side of the rear plate 103, and the electrical connection port is connected to the two copper plates 208; the contact head 207 is provided with two protrusions, and the two protrusions of the contact head 207 are respectively connected to the positive and negative pole connection wires of the battery 202, and the two protrusions of the contact head 207 are respectively slidably connected to the two copper plates 208; the track groove 303 is smoothly connected by a groove with a center line obliquely downward and a groove with a center line vertical, and the lateral length of the oblique downward groove of the track groove 303 is greater than the distance between the protruding end face of the contact head 207 and the side of the junction box 204 when the spring of the spring shaft 206 is not under force.

[0031] As attached Figure 5 ~Attached Fig.12As shown, the motion assembly is provided with a telescopic shaft 301, a connecting slot rod 308 and a horizontal slot block 317, the telescopic shaft 301 is fixedly and slidably mounted on the bottom plate 108, the telescopic part of the telescopic shaft 301 is fixedly mounted on the lower side of the battery holder 201, the junction box 204 is fixedly mounted on the upper side of the battery holder 201, a cylindrical protrusion is provided on the side of the junction box 204, a sliding groove is provided on the side of the connecting slot rod 308, the cylindrical protrusion of the junction box 204 is slidably mounted in the sliding groove of the connecting slot rod 308, and the end of the connecting slot rod 308 away from the junction box 204 A fixed block 316 is rotatably installed, and the fixed block 316 is slidably installed on the horizontal slot block 317. The horizontal slot block 317 is fixedly installed on the inner side of the side plate 107. A connecting block 315 is also slidably installed on the horizontal slot block 317. The connecting block 315 is fixedly installed on the side of the fixed block 316. A cylindrical protrusion is provided on the upper surface of the connecting block 315. The outer surface of the cylindrical protrusion of the connecting block 315 is rotatably connected to one end of the telescopic connecting rod 314. The other end of the telescopic connecting rod 314 is rotatably installed on the inner side of the side rotating door 106; the inner side plate 107 is also provided with The horizontal groove 304 has a center line in the horizontal direction, and the horizontal length of the horizontal groove 304 is greater than the horizontal length of the oblique downward groove of the track groove 303. A sliding block 302 is slidably installed inside the horizontal groove 304, and the sliding block 302 is fixedly installed with the connecting groove rod 308; the upper surface of the horizontal groove block 317 and the upper surface of the fixed part of the telescopic shaft 301 are both located below the lower surface of the rectangular through hole of the side plate 107; the motion component is also provided with a vertical track 305 and a first connecting rod 309, and the vertical track 305 is fixedly installed on the bottom plate 108, The vertical track 305 is formed by vertically connecting a section of vertical track and a section of horizontal track. A first sliding seat 310 is slidably installed in the vertical track of the vertical track 305, and a second sliding seat 312 is slidably installed in the horizontal track of the vertical track 305. The first sliding seat 310 is rotatably connected to one end of the first connecting rod 309, and the other end of the first connecting rod 309 is rotatably installed on the lower side of the battery seat 201. The first sliding seat 310 is also rotatably connected to one end of the second connecting rod 311, and the other end of the second connecting rod 311 is rotatably connected to the second sliding seat 312.

[0032] As attached Figure 1 ~Attached Figure 5 , Attachment Figure 7 ~Attached Fig.12As shown, a junction box 204 is fixedly installed on the upper side of the battery holder 201, a roller 307 is rotatably installed on the side of the junction box 204, a roller frame 306 is rotatably installed on the roller 307, and the roller frame 306 is slidably installed in the track groove 303, a side rotating door 106 is rotatably installed in the rectangular through hole of the side panel 107, a rear rotating door 104 is rotatably installed in the rectangular through hole on the side of the rear panel 103, and a front rotating door 109 is rotatably installed in the rectangular through hole of the front panel 101, and two rectangular grooves are arranged on the lower side of the rectangular through hole of the front panel 101, baffles 105 are installed on the sides of the rear panel 103 and the front panel 101, a top panel 102 is fixedly installed on the upper side of the front panel 101, and the baffles 105 are installed on the sides of the rear panel 103 and the front panel 101 by bolts, and the baffles 105 block the rear rotating door 104 and the front rotating door 109 and restrict their rotation.

[0033] Attached Figure 6 ~Attached Fig.11 As shown, two second sliding seats 312 are provided, and a push rod 313 is fixedly installed on the upper side of each second sliding seat 312. The push rod 313 is slidably installed in the rectangular groove of the front plate 101. A rectangular boss is provided on the upper side of the push rod 313, and the front rotating door 109 is pushed to rotate by the rectangular boss on the upper side of the push rod 313; when the telescopic shaft 301 is fully retracted, the battery seat 201 and the junction box 204 are all located in the rectangular through hole of the rear plate 103.

[0034] The working principle of this device is as follows.

[0035] (i) When maintenance is required, the bolts of the side baffles 105 of the rear plate 103 and the front plate 101 are removed, and then the side rotating door 106 is rotated. The side rotating door 106 drives the telescopic connecting rod 314 to rotate, and the telescopic connecting rod 314 drives the connecting block 315 to slide along the horizontal slot block 317. The connecting block 315 drives the fixed block 316 to slide along the horizontal slot block 317. When the fixed block 316 moves, it drives the connecting slot rod 308 to move. The connecting slot rod 308 drives the sliding block 302 to slide along the horizontal slot 304. The sliding block 302 makes the connecting slot rod 308 move parallelly. The connecting slot rod 308 drives the junction box 204 to move, and the junction box 204 drives the roller frame 306 to slide along the oblique slot of the track slot 303.

[0036] (ii) When the roller frame 306 slides along the inclined groove of the track groove 303, it drives the battery holder 201 to move, and the battery holder 201 drives the contact head 207 to gradually separate from the copper plate 208, thereby achieving power off. When the spring shaft 206 slides to the vertical slide groove of the track groove 303, the side rotating door 106 stops rotating. Under the action of the gravity of the battery holder 201, the spring shaft 206 slides along the vertical slide groove of the track groove 303, and the telescopic shaft 301 continues to shrink.

[0037] (iii) When the telescopic shaft 301 is fully retracted, the battery holder 201 and the junction box 204 are all located in the rectangular through hole of the rear plate 103. At this time, the battery 202 is taken out through the rectangular through holes of the front plate 101, the rear plate 103 and the side plate 107, and then maintenance begins.

Claims

1. A battery cabinet for communication facilities that is easy to maintain, comprising a cabinet body (1), characterized in that: It also includes a mounting mechanism (2) and a moving mechanism (3), the cabinet (1) is hollow inside, the cabinet (1) is provided with a front panel (101), a rear panel (103) and a side panel (107), two side panels (107) are provided, one side of the two side panels (107) is fixedly mounted on the inner side of the front panel (101), and the other side of the two side panels (107) is fixedly mounted on the inner side of the rear panel (103), and the side surfaces of each of the front panel (101), the rear panel (103) and the side panels (107) are provided with rectangular through holes, the upper surfaces of each through hole overlap with each other, and the lower surfaces of each through hole overlap with each other; A track groove (303) is provided on the inner side of each side plate (107), the mounting mechanism (2) is provided with a battery seat (201), the battery seat (201) is slidably mounted in the track groove (303), a plurality of storage batteries (202) are mounted on the battery seat (201), and the storage batteries (202) are connected to the elastic electrical connection assembly; The cabinet (1) is also provided with a side rotating door (106), two side rotating doors (106) are provided, and the two side rotating doors (106) are respectively rotatably mounted in the rectangular through holes on the side of each side plate (107), and the moving mechanism (3) is provided with a motion component, the motion component is connected to the side rotating door (106), the motion component is installed inside the cabinet (1), and the motion component is also connected to the battery holder (201).

2. A battery cabinet for communication facilities that is easy to maintain according to claim 1, characterized in that: The elastic electrical connection assembly is provided with a junction box (204), wherein the junction box (204) contains positive and negative connection wires of each storage battery (202), and a plurality of connection cylinders (205) are fixedly installed on the side of the junction box (204), wherein the connection cylinder (205) is hollow inside, and a spring shaft (206) is slidably installed on the inner wall of the connection cylinder (205), and a spring is wound on the outer surface of the spring shaft (206), and one end of the spring on the outer surface of the spring shaft (206) is fixedly installed on the inner wall of the connection cylinder (205), and the other end of the spring on the outer surface of the spring shaft (206) is fixedly installed on the outer surface of the spring shaft (206), and the spring shaft (206) is hollow inside, and a contact head (207) is fixedly installed on the inner wall of the spring shaft (206), and the contact head (207) is connected to the positive and negative connection wires of the storage battery (202).

3. A battery cabinet for communication facilities that is easy to maintain according to claim 2, characterized in that: The rear plate (103) is provided with a wiring slot (209) on the inner side, two copper plates (208) are fixedly installed in the wiring slot (209), and an electrical connection port is provided on the outer side of the rear plate (103), and the electrical connection port is connected to the two copper plates (208); the contact head (207) is provided with two protrusions, and the two protrusions of the contact head (207) are respectively connected to the positive and negative pole connection wires of the battery (202), and the two protrusions of the contact head (207) are respectively slidably connected to the two copper plates (208).

4. A battery cabinet for communication facilities that is easy to maintain according to claim 3, characterized in that: The track groove (303) is composed of a groove with a center line obliquely downward and a groove with a center line vertically connected smoothly, and the lateral length of the groove obliquely downward of the track groove (303) is greater than the distance between the protruding end surface of the contact head (207) and the side surface of the junction box (204) when the spring of the spring shaft (206) is not under force.

5. The battery cabinet for communication facilities that is easy to maintain according to claim 3 is characterized in that: The motion assembly is provided with a telescopic shaft (301), a connecting slot rod (308) and a horizontal slot block (317); the telescopic shaft (301) is fixedly and slidably mounted on the lower side of the cabinet (1); the telescopic portion of the telescopic shaft (301) is fixedly mounted on the lower side of the battery holder (201); the junction box (204) is fixedly mounted on the upper side of the battery holder (201); a cylindrical protrusion is provided on the side of the junction box (204); a sliding groove is provided on the side of the connecting slot rod (308); the cylindrical protrusion of the junction box (204) is slidably mounted in the sliding groove of the connecting slot rod (308); the connecting slot rod (308) is away from the junction box A fixed block (316) is rotatably mounted on one end of (204), and the fixed block (316) is slidably mounted on a horizontal slot block (317). The horizontal slot block (317) is fixedly mounted on the inner side of the side plate (107). A connecting block (315) is also slidably mounted on the horizontal slot block (317). The connecting block (315) is fixedly mounted on the side of the fixed block (316). A cylindrical protrusion is provided on the upper surface of the connecting block (315). The outer surface of the cylindrical protrusion of the connecting block (315) is rotatably connected to one end of the telescopic connecting rod (314), and the other end of the telescopic connecting rod (314) is rotatably mounted on the inner side of the side rotating door (106).

6. A battery cabinet for communication facilities that is easy to maintain according to claim 5, characterized in that: A horizontal groove (304) is also provided on the inner side of the side plate (107). The center line of the horizontal groove (304) is in the horizontal direction. The horizontal length of the horizontal groove (304) is greater than the horizontal length of the groove obliquely downward of the track groove (303). A sliding block (302) is slidably installed on the inner side of the horizontal groove (304). The sliding block (302) is fixedly installed with the connecting groove rod (308).

7. A battery cabinet for communication facilities that is easy to maintain according to claim 5, characterized in that: The upper surface of the horizontal slot block (317) and the upper surface of the fixed portion of the telescopic shaft (301) are both located below the lower surface of the rectangular through hole of the side plate (107).

8. A battery cabinet for communication facilities that is easy to maintain according to claim 6, characterized in that: The motion assembly is further provided with a vertical track (305) and a first connecting rod (309). The vertical track (305) is fixedly installed inside the cabinet (1). The vertical track (305) is formed by vertically connecting a section of a vertical track and a section of a horizontal track. A first sliding seat (310) is slidably installed in the vertical track of the vertical track (305). A second sliding seat (312) is slidably installed in the horizontal track of the vertical track (305). The first sliding seat (310) is rotatably connected to one end of the first connecting rod (309). The other end of the first connecting rod (309) is rotatably installed on the lower side of the battery seat (201). The first sliding seat (310) is also rotatably connected to one end of the second connecting rod (311). The other end of the second connecting rod (311) is rotatably connected to the second sliding seat (312).

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