Outdoor cable bridge assembly replacement equipment

Abstract

The invention belongs to the technical field of cable installation, and discloses outdoor cable bridge assembly replacement equipment which is technically characterized by comprising a base, a workbench is arranged above the base, two sets of oppositely-distributed vertical plates are fixedly installed on the surface of the workbench, round holes are formed in the surfaces of the vertical plates, and bearing discs are rotatably installed in the round holes; two groups of transverse columns are rotationally mounted on the two opposite side walls of the two groups of bearing discs jointly, a bearing plate is fixedly mounted on the surfaces of the transverse columns, a plurality of groups of stop levers distributed at equal intervals are fixedly mounted on the upper surface of the bearing plate, a counterweight strip is fixedly mounted on the lower surface of the bearing plate, and an overturning assembly matched with the bearing discs is arranged between the two groups of vertical plates; a positioning mechanism matched with the transverse column is arranged between the two sets of bearing discs, the positioning mechanism comprises a clamping assembly and an adjusting assembly, and the problems that at present, a worker needs to manually take and position the cable bridge, the cable bridge installation efficiency is low, and the installation difficulty is large are solved.

Description

Technical Field

[0001] The present invention relates to the technical field of cable installation, and specifically to an outdoor cable tray assembly replacement device. Background Art

[0002] Cable trays are divided into trough cable trays, tray cable trays, ladder cable trays, grid trays and other structures, and are composed of brackets, cantilever arms and installation accessories, etc. They can be erected independently or laid on various building (structure) buildings and pipe gallery brackets, reflecting the characteristics of simple structure, beautiful shape, flexible configuration and convenient maintenance. All parts need to be galvanized. For the trays installed outdoors and exposed to the open air, their materials must have the physical properties of corrosion resistance, moisture resistance, good adhesion and high impact resistance.

[0003] When replacing and installing cable trays, since cable trays are all long strip structures, it is difficult for workers to conveniently pick up and position the cable trays. After the original cable bridge is disassembled and placed, a new cable tray needs to be picked up for installation, resulting in low installation efficiency and great installation difficulty of the cable trays. Summary of the Invention

[0004] The purpose of the present invention is to provide an outdoor cable tray assembly replacement device to solve the problems raised in the above background art.

[0005] To achieve the above purpose, the present invention provides the following technical solutions:

[0006] An outdoor cable tray assembly replacement device includes a base. A workbench is arranged above the base. A lifting assembly connected to the bottom wall of the workbench is arranged on the surface of the base. Two groups of vertically arranged plates are fixedly installed on the surface of the workbench. Circular holes are formed on the surfaces of the vertically arranged plates. A bearing plate is rotatably installed in the circular holes. Two groups of cross columns are rotatably installed on the opposite side walls of the two bearing plates. The two groups of cross columns are distributed oppositely along the diameter direction of the bearing plate. A bearing plate is fixedly installed on the surface of the cross column. Multiple groups of equally spaced blocking rods are fixedly installed on the upper surface of the bearing plate. The multiple groups of blocking rods are respectively located on both sides of the bearing plate. A counterweight bar is fixedly installed on the lower surface of the bearing plate. A flipping assembly cooperating with the bearing plate is arranged between the two vertically arranged plates. The flipping assembly is used to control the two bearing plates to rotate synchronously on the surfaces of the two vertically arranged plates respectively. A positioning mechanism cooperating with the cross column is arranged between the two bearing plates. The positioning mechanism includes a clamping assembly and an adjusting assembly. The clamping assembly is located on the surface of the bearing plate and is connected to the cross column. When disassembling and installing the cable tray, the clamping assembly is used to fix the position and angle of the cross column on the surface of the bearing plate. The adjusting assembly is connected to the clamping assembly. When the bearing plate rotates on the surface of the vertically arranged plate, the adjusting assembly is used to release the restriction of the clamping assembly on the cross column.

[0007] As a further solution of the present invention: The flipping assembly includes a gear ring fixedly installed on the annular side wall of the bearing plate and located outside the vertical plate. Two vertical plates are jointly rotatably installed with a rotating column located outside the bearing plate. A transmission gear disc is fixedly installed on the surface of the rotating column, and the transmission gear disc is meshed with the gear ring. A motor is fixedly installed on the side wall of one vertical plate, and the output shaft of the motor is connected to the rotating column.

[0008] As a further solution of the present invention: The clamping assembly includes a control column slidably installed by two bearing plates. Both ends of the control column extend to the outside of the bearing plate respectively. Both ends of the cross column extend to the outside of the bearing plate and are fixedly installed with control discs. Two positioning holes are opened on the surface of the control disc, and the two positioning holes are distributed oppositely along the diameter direction of the control disc. A positioning rod that cooperates with the positioning hole is fixedly installed on the surface of the control column, and the control column is connected to the adjusting assembly.

[0009] As a further solution of the present invention: The adjusting assembly includes a baffle fixedly installed at one end of the control column. An extrusion spring is fixedly installed on the side wall of one vertical plate, and the telescopic end of the extrusion spring is connected to the baffle. A limiting hole is opened on the side wall of the other vertical plate, and a limiting column that cooperates with the limiting hole is rotatably installed on the surface of the control column.

[0010] As a further solution of the present invention: A ring-shaped guide groove is opened on the annular side wall of the round hole, and a guide ring that cooperates with the guide groove is fixedly installed on the annular side wall of the bearing plate.

[0011] As a further solution of the present invention: A handle is fixedly installed at the end of the control column.

[0012] As a further solution of the present invention: Rollers are respectively arranged around the bottom wall of the base.

[0013] Compared with the prior art, the beneficial effects of the present invention are: By setting a positioning mechanism composed of a clamping assembly and an adjusting assembly to cooperate with the flipping assembly, the relative positions of the two bearing plates and the bearing plate can be adjusted conveniently, and further the positions and heights of the two bearing plates can be adjusted conveniently, which can assist in supporting the cable tray when replacing the cable tray, effectively improving the stability when replacing the cable tray. It solves the problems that at present, workers need to manually take and position the cable tray, and the installation efficiency of the cable tray is low and the installation difficulty is large. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 is a schematic three-dimensional structure diagram of an outdoor cable tray assembly replacement device provided in an embodiment of the present invention Figure 1 .

[0015] Figure 2Schematic three-dimensional structure of an outdoor cable tray assembly replacement device provided in an embodiment of the present invention Figure 2 。

[0016] Figure 3 Schematic front view structure of an outdoor cable tray assembly replacement device provided in an embodiment of the present invention.

[0017] Figure 4 For Figure 1 Enlarged structure schematic diagram of A in

[0018] Figure 5 For Figure 2 Enlarged structure schematic diagram of B in

[0019] Figure 6 Schematic diagram of a bearing plate and its connection structure in an outdoor cable tray assembly replacement device provided in an embodiment of the present invention.

[0020] Wherein: 1 - base, 2 - workbench, 3 - vertical plate, 31 - round hole, 4 - bearing plate, 5 - cross column, 6 - bearing plate, 61 - stop bar, 62 - counterweight bar, 7 - flipping assembly, 71 - gear ring, 72 - rotating column, 73 - transmission gear disc, 74 - motor, 8 - positioning mechanism, 81 - clamping assembly, 811 - control plate, 812 - positioning hole, 813 - control column, 814 - positioning rod, 82 - adjusting assembly, 821 - limiting hole, 822 - limiting column, 823 - baffle, 824 - compression spring, 9 - lifting assembly, 10 - guiding groove, 11 - guiding ring, 12 - handle, 13 - roller. Detailed implementation manners

[0021] It should be noted that, without conflict, the embodiments in the present invention and the features in the embodiments can be combined with each other.

[0022] The following describes in detail the specific implementation of the present invention in combination with specific embodiments.

[0023] Such as Figure 1 、 Figure 3 、 Figure 6As shown in the figure, it is a structural diagram of an outdoor cable tray assembly replacement device provided by an embodiment of the present invention, including a base 1. Above the base 1, there is a workbench 2. On the surface of the base 1, there is a lifting assembly 9 connected to the bottom wall of the workbench 2. On the surface of the workbench 2, two groups of vertically distributed vertical plates 3 are fixedly installed. On the surface of the vertical plates 3, circular holes 31 are opened. Inside the circular holes 31, a bearing plate 4 is rotatably installed. On the opposite side walls of the two bearing plates 4, two cross columns 5 are rotatably installed together. The two cross columns 5 are distributed relatively along the diameter direction of the bearing plate 4. On the surface of the cross column 5, a bearing plate 6 is fixedly installed. On the upper surface of the bearing plate 6, multiple groups of equally spaced retaining bars 61 are fixedly installed. The multiple groups of retaining bars 61 are located on both sides of the bearing plate 6 respectively. On the lower surface of the bearing plate 6, a counterweight bar 62 is fixedly installed. Between the two vertical plates 3, there is a flipping assembly 7 that cooperates with the bearing plate 4. The flipping assembly 7 is used to control the two bearing plates 4 to rotate synchronously on the surfaces of the two vertical plates 3 respectively. Between the two bearing plates 4, there is a positioning mechanism 8 that cooperates with the cross column 5. The positioning mechanism 8 includes a clamping assembly 81 and an adjusting assembly 82. The clamping assembly 81 is located on the surface of the bearing plate 4 and is connected to the cross column 5. When disassembling and installing the cable tray, the clamping assembly 81 is used to fix the position and angle of the cross column 5 on the surface of the bearing plate 4. The adjusting assembly 82 is connected to the clamping assembly 81. When the bearing plate 4 rotates on the surface of the vertical plate 3, the adjusting assembly 82 is used to release the restriction of the clamping assembly 81 on the cross column 5.

[0024] Initially, the lifting assembly 9 controls the workbench 2 to be in the lowest position above the base 1. The flipping assembly 7 positions the bearing plate 4 on the surface of the vertical plate 3, so that the two cross columns 5 are distributed relatively in the vertical direction. The clamping assembly 81 fixes the position and angle of the cross column 5 on the surface of the bearing plate 4. At this time, the bearing plate 6 on the surface of the cross column 5 remains in a fixed state between the two bearing plates 4. Place the cable tray to be installed on the upper surface of the bearing plate 6. The multiple groups of retaining bars 61 are located on both sides of the cable tray respectively to position the cable tray. After the cable tray is placed, the clamping assembly 81 releases the restriction on the cross column 5. The flipping assembly 7 controls the bearing plate 4 to rotate 180 degrees on the surface of the vertical plate 3. The two bearing plates 4 drive the cross column 5 and the bearing plate 6 to rotate 180 degrees synchronously. When the bearing plate 6 rotates, the counterweight bar 62 cooperates with the cross column 5 to control the bearing plate 6 to always maintain a horizontal state. After the bearing plate 4 rotates 180 degrees, the flipping assembly 7 controls the bearing plate 4 to stop rotating on the surface of the vertical plate 3. The clamping assembly 81 fixes the position and angle of the cross column 5 on the surface of the bearing plate 4 again. At this time, the bearing plate 6 with the cable tray placed on it is at a low position, and the other bearing plate 6 rotates to a high position.

[0025] The lifting assembly 9 controls the workbench 2 to move vertically upward, thereby adjusting the height of the bearing plate 6, so that the upper bearing plate 6 moves below the cable tray to be replaced. At this time, multiple groups of blocking rods 61 are on both sides of the cable tray to be replaced. After the cable tray to be replaced is disassembled, the cable tray automatically falls onto the surface of the bearing plate 6, and there is no need for the staff to manually pick up the cable tray. After the cable tray is disassembled, the clamping assembly 81 releases the restriction on the cross column 5 again, and the flipping assembly 7 controls the bearing disc 4 to rotate 180 degrees on the surface of the vertical plate 3. The two bearing discs 4 drive the bearing plate 6 to rotate 180 degrees synchronously. When the bearing plate 6 rotates, the counterweight bar 62 cooperates with the cross column 5 to control the bearing plate 6 to always maintain a horizontal state. After the bearing disc 4 rotates 180 degrees, the just-disassembled cable tray rotates to the lower part, and the cable tray to be installed rotates to the upper part, so that the new cable tray can be installed conveniently. During the installation process, there is no need for the staff to pick up the cable tray, effectively improving the stability during installation. After the installation is completed, the lifting assembly 9 controls the workbench 2 to move vertically downward. After moving to a suitable height, the staff can conveniently remove the disassembled cable tray from the surface of the bearing plate 6.

[0026] As Figure 1 , Figure 2 , Figure 6 shown, as a preferred embodiment of the present invention, the flipping assembly 7 includes a toothed ring 71 fixedly installed on the circumferential side wall of the bearing disc 4 and located outside the vertical plate 3. Two vertical plates 3 are jointly rotatably installed with a rotating column 72 located outside the bearing disc 4. A transmission gear disc 73 is fixedly installed on the surface of the rotating column 72. The transmission gear disc 73 is meshed and connected with the toothed ring 71. A motor 74 is fixedly installed on the side wall of one vertical plate 3. The output shaft of the motor 74 is connected to the rotating column 72.

[0027] During use, the transmission gear disc 73 meshes with the toothed ring 71 to position the bearing disc 4. When the motor 74 is not started, the bearing disc 4 remains stationary on the surface of the vertical plate 3. When it is necessary to adjust the positions of the two bearing plates 6, the motor 74 drives the rotating column 72 to rotate. The rotating column 72 drives the transmission gear disc 73 to rotate. The transmission gear disc 73 meshes and drives with the toothed ring 71 to drive the bearing disc 4 to rotate in the circular hole 31. After the bearing disc 4 rotates 180 degrees, the motor 74 stops running.

[0028] As Figure 1 , Figure 4 , Figure 5 , Figure 6As shown, as a preferred embodiment of the present invention, the clamping component 81 includes a control column 813 on which two groups of bearing plates 4 are slidably installed together. Both ends of the control column 813 extend to the outside of the bearing plate 4. Both ends of the cross column 5 extend to the outside of the bearing plate 4 and are fixedly installed with control discs 811. Two positioning holes 812 are formed on the surface of the control disc 811. The two positioning holes 812 are distributed oppositely along the diameter direction of the control disc 811. A positioning rod 814 that cooperates with the positioning hole 812 is fixedly installed on the surface of the control column 813. The control column 813 is connected to the adjusting component 82.

[0029] Initially, the adjusting component 82 positions the control column 813 between the two groups of bearing plates 4. The positioning rod 814 on the surface of the control column 813 is inserted into the positioning hole 812 on the surface of the control disc 811. The cooperation between the positioning rod 814 and the positioning hole 812 can effectively prevent the cross column 5 from rotating on the surface of the bearing plate 4. During the disassembly and installation of the cable tray, the bearing plate 6 can be stably located between the two groups of bearing plates 4, effectively improving the stability during disassembly and installation. When it is necessary to adjust the height positions of the two groups of bearing plates 6, the adjusting component 82 adjusts the position of the control column 813 on the surface of the bearing plate 4, so that the positioning rod 814 on the surface of the control column 813 is separated from the positioning hole 812. At this time, the positioning rod 814 releases the restriction on the control disc 811. When the bearing plate 4 rotates on the surface of the vertical plate 3, the cross column 5 can rotate synchronously on the surface of the bearing plate 4, so that the bearing plate 6 always remains in a horizontal state.

[0030] As Figure 1 , Figure 4 , Figure 5 As shown, as a preferred embodiment of the present invention, the adjusting component 82 includes a baffle 823 fixedly installed at one end of the control column 813. A compression spring 824 is fixedly installed on the side wall of one group of vertical plates 3. The telescopic end of the compression spring 824 is connected to the baffle 823. A limiting hole 821 is formed on the side wall of the other group of vertical plates 3. A limiting column 822 that cooperates with the limiting hole 821 is rotatably installed on the surface of the control column 813.

[0031] Initially, the compression spring 824 applies a thrust to the baffle 823, and the positioning rod 814 on the surface of the control column 813 is inserted into the positioning hole 812 on the surface of the control disk 811. When it is necessary to adjust the height positions of the two groups of bearing plates 6, the control column 813 is pulled on the surface of the bearing disk 4 to move, so that the positioning rod 814 on the surface of the control column 813 is separated from the positioning hole 812. The limit column 822 is rotated so that the end of the limit column 822 is aligned with the limit hole 821. The control column 813 is released, and the limit column 822 is inserted into the limit hole 821. The limit column 822 and the limit hole 821 cooperate with each other to fix the position of the control column 813. At this time, the positioning rod 814 can be separated from the positioning hole 812 for a long time. After the two groups of bearing plates 6 are adjusted to the appropriate height positions, the control column 813 is pulled again to separate the limit column 822 from the limit hole 821. The control column 813 is released, and the positioning rod 814 on the surface of the control column 813 is inserted into the positioning hole 812 on the surface of the control disk 811, and the positions of the cross column 5 and the bearing plate 6 can be fixed again. At this time, the cable tray can be disassembled or installed.

[0032] As Figure 6 shown, as a preferred embodiment of the present invention, an annular guide groove 10 is provided on the annular side wall of the circular hole 31, and a guide ring 11 that cooperates with the guide groove 10 is fixedly installed on the annular side wall of the bearing disk 4.

[0033] When the bearing disk 4 rotates in the circular hole 31, the guide ring 11 rotates synchronously in the guide groove 10. The guide ring 11 and the guide groove 10 cooperate with each other to effectively improve the stability of the bearing disk 4 during rotation.

[0034] As Figure 4 、 Figure 6 shown, as a preferred embodiment of the present invention, a handle 12 is fixedly installed at the end of the control column 813.

[0035] As Figure 1 、 Figure 3 shown, as a preferred embodiment of the present invention, rollers 13 are respectively provided around the bottom wall of the base 1. Through the cooperation of the rollers 13 and the base 1, the position of the entire device can be adjusted conveniently, which is convenient for replacing the cable trays at different positions.

[0036] The working principle of the present invention is as follows: Initially, the lifting assembly 9 controls the workbench 2 to be at the lowest position above the base 1. The driving gear disk 73 meshes with the gear ring 71 to position the bearing disk 4, so that the two cross columns 5 are distributed relatively in the vertical direction. The compression spring 824 exerts a thrust on the baffle 823, and the positioning rod 814 on the surface of the control column 813 is inserted into the positioning hole 812 on the surface of the control disk 811. At this time, the bearing plate 6 on the surface of the cross column 5 is fixed between the two bearing disks 4. Place the cable tray to be installed on the surface of the upper bearing plate 6, and multiple stop bars 61 are respectively located on both sides of the cable tray to position the cable tray.

[0037] After the cable tray is placed, pull the control column 813 to move, so that the positioning rod 814 on the surface of the control column 813 is separated from the positioning hole 812. Rotate the limit column 822 so that the end of the limit column 822 is aligned with the limit hole 821. Release the control column 813, and the limit column 822 is inserted into the limit hole 821. The cooperation between the limit column 822 and the limit hole 821 can fix the position of the control column 813. At this time, the positioning rod 814 can be separated from the positioning hole 812 for a long time. The motor 74 drives the rotating column 72 to rotate, the rotating column 72 drives the driving gear disk 73 to rotate, and the driving gear disk 73 meshes with the gear ring 71 to drive the bearing disk 4 to rotate in the circular hole 31. The two bearing disks 4 drive the cross column 5 and the bearing plate 6 to rotate synchronously by 180 degrees. When the bearing plate 6 rotates, the counterweight strip 62 cooperates with the cross column 5 to control the bearing plate 6 to always maintain a horizontal state. After the bearing disk 4 rotates 180 degrees, the motor 74 stops running, and the bearing disk 4 stops rotating on the vertical plate 3. Pull the control column 813 again to separate the limit column 822 from the limit hole 821. Release the control column 813, and the positioning rod 814 on the surface of the control column 813 is inserted into the positioning hole 812 on the surface of the control disk 811, which can fix the positions of the cross column 5 and the bearing plate 6 again. At this time, the bearing plate 6 with the cable tray placed on it is at a low position, and the other bearing plate 6 rotates to a high position.

[0038] The lifting component 9 controls the workbench 2 to move vertically upward to adjust the height of the bearing plate 6, so that the upper bearing plate 6 moves below the cable tray to be replaced. At this time, multiple groups of stop bars 61 are located on both sides of the cable tray to be replaced. After the cable tray to be replaced is disassembled, the cable tray automatically falls onto the surface of the bearing plate 6, eliminating the need for workers to manually pick up the cable tray. After the cable tray is disassembled, the restriction on the cross column 5 is released again, and the bearing disk 4 is controlled to rotate 180 degrees on the surface of the vertical plate 3. The two bearing disks 4 drive the bearing plate 6 to rotate 180 degrees synchronously. When the bearing plate 6 rotates, the counterweight bar 62 cooperates with the cross column 5 to control the bearing plate 6 to always maintain a horizontal state. After the bearing disk 4 rotates 180 degrees, the just-disassembled cable tray rotates to the lower part, and the cable tray to be installed rotates to the upper part, facilitating the installation of the new cable tray. During the installation process, there is no need for workers to pick up the cable tray, effectively improving the stability during installation. After the installation is completed, the lifting component 9 controls the workbench 2 to move vertically downward. After it is moved to a suitable height, workers can conveniently remove the disassembled cable tray from the surface of the bearing plate 6.

[0039] The above describes the preferred embodiments of the present invention in detail. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those of ordinary skill in the art, various changes can be made without departing from the gist of the present invention.

Claims

1. An outdoor cable tray assembly replacement device, comprising a base, a workbench is arranged above the base, and a lifting assembly connected to the bottom wall of the workbench is arranged on the surface of the base, characterized in that: Two groups of relatively distributed vertical plates are fixedly installed on the surface of the workbench, and circular holes are opened on the surfaces of the vertical plates. A bearing plate is rotatably installed in the circular holes. Two groups of horizontal columns are rotatably installed on the opposite side walls of the two groups of bearing plates. The two groups of horizontal columns are relatively distributed along the diameter direction of the bearing plates. A bearing plate is fixedly installed on the surface of the horizontal column. A plurality of equally spaced baffle bars are fixedly installed on the upper surface of the bearing plate. The plurality of baffle bars are respectively located on both sides of the bearing plate, and a counterweight bar is fixedly installed on the lower surface of the bearing plate. A flip assembly that cooperates with the carrier plate is provided between the two groups of vertical plates, and the flip assembly is used to control the two groups of carrier plates to rotate synchronously on the surfaces of the two groups of vertical plates respectively; A positioning mechanism cooperating with the horizontal column is arranged between the two groups of bearing plates, and the positioning mechanism includes a clamping assembly and an adjusting assembly; The clamping assembly is located on the surface of the supporting plate and is connected to the horizontal column. When the cable tray is disassembled and installed, the clamping assembly is used to fix the position angle of the horizontal column on the surface of the supporting plate. The adjusting assembly is connected to the clamping assembly. When the supporting plate rotates on the surface of the vertical plate, the adjusting assembly is used to release the restriction of the clamping assembly on the horizontal column.

2. The outdoor cable tray assembly replacement device according to claim 1, characterized in that: The flip assembly includes a gear ring fixedly installed on the annular side wall of the supporting plate and located on the outer side of the vertical plate, two groups of vertical plates are jointly rotatably installed with a rotating column located on the outer side of the supporting plate, a transmission gear plate is fixedly installed on the surface of the rotating column, and the transmission gear plate is meshingly connected with the gear ring, and a group of vertical plate side walls are fixedly installed with a motor, and the output shaft of the motor is connected to the rotating column.

3. The outdoor cable tray assembly replacement device according to claim 1, characterized in that: The clamping assembly includes two groups of control columns that are slidably installed together on the supporting plates, the two ends of the control columns extend to the outside of the supporting plates respectively, the two ends of the cross column extend to the outside of the supporting plates respectively and the control plates are fixedly installed, two groups of positioning holes are opened on the surface of the control plate, the two groups of positioning holes are relatively distributed along the diameter direction of the control plate, and a positioning rod that cooperates with the positioning holes is fixedly installed on the surface of the control column, and the control column is connected to the adjustment assembly.

4. The outdoor cable tray assembly replacement device according to claim 3 is characterized in that: The adjustment component includes a baffle fixedly installed at one end of the control column, a group of vertical plate side walls are fixedly installed with an extrusion spring, the telescopic end of the extrusion spring is connected to the baffle, and another group of vertical plate side walls are provided with a limiting hole, and a limiting column that cooperates with the limiting hole is rotatably installed on the surface of the control column.

5. The outdoor cable tray assembly replacement device according to claim 1, characterized in that: An annular guide groove is formed on the annular side wall of the circular hole, and a guide ring which cooperates with the guide groove is fixedly mounted on the annular side wall of the carrier plate.

6. The outdoor cable tray assembly replacement device according to claim 3, characterized in that: A handle is fixedly mounted on the end of the control column.

7. The outdoor cable tray assembly replacement device according to claim 1, characterized in that: Rollers are respectively arranged around the bottom wall of the base.

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