CN213420824U - Can splice extended cross exhibition show lamp device - Google Patents

Abstract

The utility model relates to a can splice extended cross exhibition show lamp device. The lamp strip assembly comprises a cross-shaped section, wherein four lamp strip assemblies are arranged on the periphery of the cross-shaped section; the cross-shaped section comprises a middle square tube section, and four side square tube sections are arranged around the middle square tube section; the top of a middle square tube profile of the cross-shaped profile is fixedly provided with a connecting insertion tube, the middle part of the side wall of the connecting insertion tube is provided with a plurality of locking ports, the top of an inner cavity of the connecting insertion tube is provided with an upper base, an upper wiring terminal is arranged on the upper base, the middle lower part of the inner cavity of the connecting insertion tube is provided with a lower base, the lower base is provided with a lower wiring terminal, the upper wiring terminal and the lower wiring terminal are connected by adopting a lead wire, and locking pieces are arranged on the outer side of the bottom of the cross-shaped profile and between two adjacent; when the concatenation is extended, go up binding post and lower binding post butt joint plug-in connection and each locking part's spring bolt embedding each locking mouth in. The utility model has the advantages of reasonable design, the simple operation, can splice and extend.

Description

Can splice extended cross exhibition show lamp device

Technical Field

The utility model belongs to the technical field of the exhibition light, especially, relate to a can splice cross exhibition show lamp device of extended.

Background

The light facilities are usually required to be arranged in the scene of the exhibition, the light facilities play roles of decoration, atmosphere creation and the like besides playing a basic lighting role, and play an important role in the creation of the scene environment of the exhibition and the creation of the exhibition effect of the exhibition position, so that the development and design of the light facilities for the exhibition are always one of key directions of the development of the exhibition display technology.

In view of the periodic nature of the exhibition, lighting fixtures need to have the ability to be easily transported, quickly deployed and retrieved. On the other hand, in consideration of the requirements of the light setting of the exhibition site, the light strip/light curtain for lighting and atmosphere creation is usually formed with a requirement of a magnitude change, that is, the width (i.e., the height in the vertical direction) of the formed light strip/light curtain needs to be set according to a specific scene (the length of the light strip/light curtain is changed by arranging more light components in the length direction). The specification of the chinese utility model patent CN211502396U discloses a modular lamp strip device, which comprises a cross-shaped aluminum profile, and a lamp strip assembly is fixed in each outer cavity of the cross-shaped aluminum profile. The specification of the chinese utility model patent CN211902401U discloses a combined lamp strip device, this lamp strip device center aluminium alloy and a plurality of cross-sections are the rectangle, the open lamp monomer aluminium alloy in outer end, and each lamp monomer aluminium alloy is connected with the equal dismouting of center aluminium alloy, all installs in each lamp monomer aluminium alloy and is fixed with lamp strip subassembly.

The lamp strip device with the structure can only be used as a single light component, and does not have the expansion capability in the width aspect. Thus, in order to accommodate the aforementioned amplitude variation requirements at the exhibition site, it is often necessary to prepare a variety of light bar arrangements of different lengths as required. When amplitude adjustment and setting are needed on site, the lamp strip devices with different lengths and sizes are replaced in a mode selection mode. This results in the need to form multiple different sized products for the manufacturing process of the light bar assembly, which increases the complexity of the manufacturing process. On the other hand, because the exhibition arrangement of the exhibition lighting facilities is usually accompanied with the transfer and transportation work of a large number of lighting facilities, the lighting facilities can only be transported to the site in large quantity under the condition of unknown site lighting effect construction requirements, and the rest lighting settings are recovered to a spare storage after the selection and the use. This has led to the promotion by a wide margin of cloth exhibition work load, has promoted cloth exhibition personnel's intensity of labour and has reduced the efficiency of cloth exhibition work, has hindered the development of modernized extensive light cloth exhibition work.

Therefore, the structure of the exhibition lamp device needs to be optimally designed to solve the aforementioned problems.

SUMMERY OF THE UTILITY MODEL

The utility model discloses a solve the technical problem that exists among the known art and provide a cross exhibition show light device of concatenation extension formula that structural design is reasonable, the simple operation, make exhibition show light device can splice the extension, the demand that light effect was found at the adaptation exhibition scene so can be better.

The utility model discloses a solve the technical scheme that technical problem that exists among the well-known technique took and be: a splicing expandable cross-shaped exhibition and display lamp device comprises a cross-shaped section, wherein four light bar assemblies are arranged around the cross-shaped section; the cross-shaped section comprises a middle square tube section, four side square tube sections are arranged around the middle square tube section, and each light bar assembly is arranged on the outer vertical surface of the side square tube section; the top of a middle square tube profile of the cross-shaped profile is fixedly provided with a connecting insertion tube, the middle part of the side wall of the connecting insertion tube is provided with a plurality of locking ports, the top of an inner cavity of the connecting insertion tube is provided with an upper base, an upper wiring terminal is arranged on the upper base, the middle lower part of the inner cavity of the connecting insertion tube is provided with a lower base, the lower base is provided with a lower wiring terminal, the upper wiring terminal and the lower wiring terminal are connected by adopting a lead wire, and locking pieces are arranged on the outer side of the bottom of the cross-shaped profile and between two adjacent; when the connecting insertion pipe of the next exhibition display lamp device is inserted into the lower end of the middle square pipe profile of the last exhibition display lamp device, the upper wiring terminal and the lower wiring terminal are in butt-joint splicing connection, and the lock tongues of the locking pieces are embedded into the locking openings.

The utility model has the advantages that:

the utility model provides a but, cross exhibition show light device of extension formula is spliced to structural design is reasonable compares with current lamp strip device, the utility model discloses in install upper base and last binding post, lower part installation base and lower binding post in the inner chamber of middle part side pipe section bar in the top installation connection intubate and the connection intubate at the middle part side pipe section bar of cross section bar, make this exhibition show light device can be in order plug-in connection, therefore possessed the function that the concatenation was extended. After the splicing expansion, the exhibition lamp device not only expands the whole length, but also can better adapt to the requirement of building the light effect on the exhibition site. Through the butt joint connection between the upper wiring terminal and the lower wiring terminal, the conduction on a circuit is realized, so that an additional power line does not need to be introduced, and the spliced and expanded exhibition lamp device keeps the simple characteristic in structure. Through set up the locking mouth and set up in the well lower part of cross section bar and lock piece with locking mouth matched with at the middle part of connecting the intubate, realized the locking after the exhibition show light device concatenation is extended, effectively avoid the exhibition show light device after the concatenation is extended to take place to separate, guaranteed the stability and the reliability of concatenation extension back structure.

Preferably: the lamp strip assembly comprises a base section, a lamp holder section and a lamp shade which are fixedly bonded by sealant, an LED lamp bead and a circuit board are mounted on the lamp holder section, a power line is connected to the circuit board, the power line extends in an inner cavity of the middle square tube section and is connected with an upper wiring terminal at the end part.

Preferably: the base section comprises a base section, and two inner and outer clamping plate sections are respectively arranged on two sides of the base section; the lamp holder section comprises a base plate section, two inner and outer clamping plate sections are respectively arranged on two sides of the base plate section, the LED lamp beads are arranged on the outer vertical surface of the base plate section of the lamp holder section, and the circuit board is arranged on the inner vertical surface of the base plate section of the lamp holder section.

Preferably: the lamp holder profile is provided with embedded grooves at two sides, and the inner wall of the lampshade is provided with embedded connecting strips which are embedded into the embedded grooves.

Preferably: the base section bar of the lamp strip assembly is fixedly connected with the side square tube section bar by using side self-tapping screws.

Preferably: the locking piece comprises an outer sleeve fixed with the cross-shaped section bar, a telescopic spring bolt is arranged in the outer sleeve, a spring is arranged between the outer sleeve and the spring bolt, and an operation end block is arranged at the outer end of the spring bolt.

Preferably: the bottom of the square tube profile is also provided with a lower cover plate with a through window in the middle, the center of each side square tube profile is provided with a side base profile, a through hole is arranged in the side base profile, a connecting hole is arranged at the corresponding position on the lower cover plate, and lower self-tapping screws are arranged in the connecting hole and the through hole.

Drawings

Fig. 1 is a schematic front view of the present invention;

fig. 2 is a schematic top view of the present invention;

fig. 3 is a schematic bottom view of the present invention;

fig. 4 is a schematic cross-sectional view of the cross-shaped section bar and the light bar assembly of the present invention;

FIG. 5 is a cross-sectional view of the cross-shaped section and the locking member of the present invention;

fig. 6 is the utility model discloses be in the main structure sketch map of concatenation expansion state.

In the figure:

1. connecting the cannula; 1-1, a locking port; 2. an upper wiring terminal; 3. an upper base; 4. a light bar assembly; 4-1, base section bar; 4-2, embedding the connecting strip; 4-3, a lampshade; 4-4, LED lamp beads; 4-5, a circuit board; 4-6, lamp holder section bar; 4-7, power lines; 4-8, sealing glue; 5. a cross-shaped section bar; 5-1, middle square tube section; 5-2, side square tube section bars; 5-3, side base section bar; 6. a lower base; 7. a locking member; 8. a lower wiring terminal; 9. a lower cover plate; 9-1, a transparent window; 10. a side tapping screw; 11. and a lower self-tapping screw.

Detailed Description

For further understanding of the contents, features and effects of the present invention, the following embodiments are described in detail.

Please refer to fig. 1 and 2, the expandable cross exhibition lamp device of the present invention comprises a cross-shaped section bar 5, four light bar assemblies 4 are installed around the cross-shaped section bar 5, and the four light bar assemblies 4 emit light in four directions to generate the light effect required by exhibition occasions.

Referring to fig. 2, it can be seen that:

the cross-shaped section bar 5 comprises a middle square tube section bar 5-1, four side square tube section bars 5-2 are arranged on the periphery of the middle square tube section bar 5-1, and each light bar assembly 4 is installed on the outer vertical surface of the side square tube section bar 5-2.

The middle square tube section 5-1 and each side square tube section 5-2 of the cross section 5 are integrally formed into an aluminum section, and the aluminum section is obtained by an extrusion forming process on an extruder.

The top of a middle square tube section 5-1 of a cross section 5 is fixedly provided with a connecting insertion tube 1 with a plurality of locking ports 1-1 in the middle of the side wall, the top of the inner cavity of the connecting insertion tube 1 is provided with an upper base 3, an upper wiring terminal 2 is arranged on the upper base 3, the middle lower part of the inner cavity of the connecting insertion tube 1 is provided with a lower base 6, a lower wiring terminal 8 is arranged on the lower base 6, and the upper wiring terminal 2 and the lower wiring terminal 8 are connected by adopting a lead wire.

As shown in the figure, the connecting insertion tube 1 is an aluminum alloy square tube, and the length and width of the connecting insertion tube is smaller than the length and width of the inner cavity of the middle square tube profile 5-1, so that the lower end of the connecting insertion tube 1 is inserted into the top of the inner cavity of the middle square tube profile 5-1, and the connecting insertion tube 1 is fixedly connected with the middle square tube profile 5-1 in a welding mode. Due to the matching relation in the aspect of the size, the connecting insertion pipe 1 can be inserted into the lower end of the inner cavity of the middle square pipe section bar 5-1 of the cross section bar 5 of another exhibition lamp device, so that the splicing expansion of a plurality of exhibition lamp devices can be carried out (or the splicing expansion is called as the cascade connection, and the plurality of exhibition lamp devices form the parallel connection relation on a circuit).

The upper base 3 can be made of bakelite, so that the upper connecting terminal 2 and the connecting insertion tube 1 have good insulating property. Specifically, the contour shape of the upper base 3 is matched with the contour shape of the inner cavity of the connecting insertion tube 1, and the upper base 3 is pressed into the inner cavity of the upper end of the connecting insertion tube 1 by a press device. A mounting hole may be formed in the center of the upper base 3, and the upper terminal 2 may be placed in the mounting hole and bonded and fixed to the upper base 3 by means of bonding or the like.

Similarly, the lower base 6 can be made of bakelite, so that the lower wiring terminal 8 and the middle square tube profile 5-1 have good insulation property. Specifically, the outline shape of the lower base 6 is consistent with the outline shape of the inner cavity of the middle square tube profile 5-1, and the lower base 6 is pressed into the middle lower part of the inner cavity of the middle square tube profile 5-1 by adopting a press facility. A mounting hole may be formed in the center of the lower base 6, and the lower terminal 8 may be placed in the mounting hole and bonded and fixed to the lower base 6 by means of bonding or the like.

Lead wires for electrically connecting the upper and lower connection terminals 2 and 8 are connected from the outside of the housings of both the upper and lower connection terminals 2 and 8 (connection contacts are provided on the housings of both the upper and lower connection terminals 2 and 8, the lead wires correspondingly connecting these connection contacts), and are not connected from the end surface, so that when the two exhibition lamp devices are cascaded, when the connecting insertion tube 1 is inserted into the inner cavity of the middle square tube section bar 5-1, the upper wiring terminal 2 of the lower exhibition lamp device is inserted on the lower wiring terminal 8 of the upper exhibition lamp device, the circuits of the two exhibition lamp devices are conducted after the two wiring terminals are inserted and connected, when one of the exhibition lamp devices is powered (usually the one positioned above), the other exhibition lamp devices which are spliced and expanded are also powered.

Locking pieces 7 are arranged on the outer side of the bottom of the cross-shaped section bar 5 and between two adjacent side square tube section bars 5-2, the locking pieces 7 are matched with the connecting insertion tubes 1 to lock two adjacent exhibition display lamp devices, and the cascaded exhibition display lamp devices cannot be disengaged under the condition that the locking pieces 7 are not operated to unlock.

Referring to fig. 2, 3 and 5, it can be seen that:

the locking piece 7 comprises an outer sleeve fixed with the cross-shaped section bar 5, a telescopic bolt is arranged in the outer sleeve, a spring is arranged between the outer sleeve and the bolt, and an operation end block is arranged at the outer end of the bolt. As shown in the figure, the inner end of the outer sleeve of the locking piece 7 is abutted between the roots of two adjacent side square tube profiles 5-2 and is welded and fixed, a lock hole which is communicated with the inside and the outside of the profile is formed in the corresponding position on the wall of the profile, and the lock tongue is positioned in the lock hole. Accordingly, four locking notches 1-1 on the connecting cannula 1 are respectively located at the middle positions of the four edges as shown in the figure.

The spring is in a stretching state, so that when the bolt is pressed or pulled to move outwards, the spring further stretches, and when the pressing or pulling action disappears, the bolt retracts inwards to the original position under the elastic force of the spring.

The inner end of the lock tongue is designed into a conical shape or a hemispherical shape, so that when the connecting insertion pipe 1 is inserted into the middle square pipe profile 5-1, the lock tongue can be automatically forced to move outwards, when the locking port 1-1 moves in place, the lock tongue moves inwards under the action of the elastic force of the spring, and the inner end of the lock tongue is inserted into the corresponding locking port 1-1 to realize locking. When the locking needs to be released, the lock tongue needs to be pulled outwards through the operation end block, the spring extends at the moment, and when the inner end of the lock tongue is separated from the locking opening 1-1, the connecting insertion pipe 1 can be separated from the middle square pipe profile 5-1.

Referring to fig. 2 and 4, it can be seen that:

the lamp strip assembly 4 comprises a base section bar 4-1, a lamp holder section bar 4-6 and a lampshade 4-3 which are fixedly bonded by sealant 4-8, an LED lamp bead 4-4 and a circuit board 4-5 are arranged on the lamp holder section bar 4-6, and a power line 4-7 is connected on the circuit board 4-5. The circuit board 4-5 is used for connecting a plurality of LED lamp beads 4-4 on the lamp holder section bar 4-6 in a circuit mode, and therefore when the circuit board 4-5 is connected with electricity, the LED lamp beads 4-4 are simultaneously lightened.

The power cord 4-7 of each light bar component 4 is connected to the upper connecting terminal 2 of the exhibition lamp device, specifically, a notch may be provided at the top edge of the middle square tube profile 5-1 and the side square tube profile 5-2, the power cord 4-7 extends upward, then extends inward via the notches on the side square tube profile 5-2 and the middle square tube profile 5-1 into the inner cavity of the middle square tube profile 5-1, and then extends upward and is connected with the upper connecting terminal 2. Each power line 4-7 is also connected to the connecting contact on the shell of the upper connecting terminal 2, so that the end surface of the connecting terminal is not occupied, and the smooth plug connection of the upper connecting terminal 2 and the lower connecting terminal 8 is ensured.

As shown in the figure, the base profile 4-1 comprises a base profile, on both sides of which an inner and an outer clamping plate profile are arranged. The lamp holder section bar 4-6 comprises a base plate section bar, an inner clamping plate section bar and an outer clamping plate section bar are respectively arranged on two sides of the base plate section bar, the LED lamp beads 4-4 are installed on the outer vertical surface of the base plate section bar of the lamp holder section bar 4-6, and the circuit board 4-5 is installed on the inner vertical surface of the base plate section bar of the lamp holder section bar 4-6. The base section 4-1 and the lamp holder section 4-6 are respectively an integrally extruded aluminum section, and the aluminum alloy is obtained by an extrusion molding process on an extruder, so that when the exhibition lamp device is constructed, the whole aluminum section is cut into appropriate length sections, and the exhibition lamp device has the designed length.

The lampshade 4-3 is U-shaped and made of acrylic material, as shown in the figure, the lamp holder section bar 4-6 is buckled on the base section bar 4-1, the lampshade 4-3 is buckled on the outer side of the lamp holder section bar 4-6, and the three are bonded and fixed at the joint through the sealant 4-8. Furthermore, in order to ensure the bonding strength, two sides of the lamp holder section bar 4-6 can be provided with embedded grooves, the inner wall of the lampshade 4-3 is provided with embedded connecting strips 4-2, and the embedded connecting strips 4-2 are embedded into the embedded grooves.

The base section bar 4-1 of the light bar assembly 4 is fixedly connected with the side square tube section bar 5-2 by the side self-tapping screws 10. Specifically, connecting holes are formed in corresponding positions of a side square tube section 5-2 and a base section 4-1, then the base section 4-1 is fixedly connected with the side square tube section 5-2 through a side self-tapping screw 10, then a lampshade 4-3 is connected to a lamp holder section 4-6 in a buckling mode, and then a combined body formed by the lampshade 4-3 and the lamp holder section 4-6 is installed on the base section 4-1 in a buckling mode and is fixed through a sealant 4-8 in an adhering mode.

Referring to fig. 1 and 3, it can be seen that:

the bottom of the exhibition lamp device is also provided with a lower cover plate 9 with a through window 9-1 in the middle, the lower cover plate 9 is fixedly connected with the bottom end of the cross-shaped section bar 5 by adopting a plurality of lower self-tapping screws 11, and the through window 9-1 is used for exposing the bottom port of the middle square tube section bar 5-1, so that the lower base 6 and the lower wiring terminal 8 are also exposed from the through window 9-1, and the splicing, expanding and connecting are convenient.

Specifically, a side base section 5-3 is arranged at the center of each side square tube section 5-2, a through hole is formed in the side base section 5-3, a connecting hole is formed in a corresponding position on the lower cover plate 9, a lower self-tapping screw 11 is arranged in the connecting hole and the through hole, and when the lower self-tapping screw 11 is screwed in, a thread is self-tapped on the inner wall of the through hole.

Considering that the positions connected when a plurality of exhibition lamp devices are cascaded should be in smooth transition, the appearance aesthetic degree of the cascaded exhibition lamp devices is kept, and the spacing distance between the lamp strip assemblies 4 is reduced as much as possible. Therefore, in the present embodiment, each lower tapping screw 11 can be countersunk, specifically, a milling process can be used to remove a part of the lower end of each side base profile 5-3 of the cross-shaped profile 5, and a stamping process can be used to stamp a groove for receiving the screw cap of the lower tapping screw 11 at the shaft hole position of the lower cover plate 9.

When screwing lower part tapping screw 11 like this, its nail cap part has just also realized countersunk head mode installation in falling into the recess, consequently the lower surface of apron 9 keeps leveling down, no protruding structure, the last port of cross section bar 5 and the last port of each lamp strip subassembly 4 also keep the parallel and level simultaneously, the butt joint of the last lower apron 9 of exhibition show lamp device after cascading with the last port of cross section bar 5 of next exhibition show lamp device and the last port of each lamp strip subassembly 4 has guaranteed the compactness of butt joint.

The using method comprises the following steps:

the exhibition lamp device is designed into a standard length of 50cm, for example, to form a unit device which can be spliced and expanded; before the exhibition is laid out, a plurality of exhibition lamp devices are transferred and conveyed to an exhibition site;

selectively expanding and cascading the exhibition and display lamp devices according to the requirement of site light effect design to form a specific form with the length meeting the use requirement; later with the exhibition show light device that obtains hanging up install on the frame of hanging up of scene high-order (adopt the hoist engine to carry out lift adjustment usually), can also set up the connecting seat pipe that has locking piece 7 and plug terminal on hanging up the frame, like this when the connecting intubate 1 of the top level exhibition show light device upwards inserts the connecting seat of hanging up the frame intraductal, locking piece 7 carries out the locking to connecting intubate 1, the last binding post 2 of top and the plug terminal plug-in connection in the connecting seat pipe simultaneously, the plug terminal in the connecting seat pipe is connected to light control system through leading the line.

Claims (7)

1. The utility model provides a can splice extended cross exhibition show lamp device, characterized by: the lamp strip assembly comprises a cross-shaped section bar (5), wherein four lamp strip assemblies (4) are arranged on the periphery of the cross-shaped section bar (5); the cross-shaped section bar (5) comprises a middle square tube section bar (5-1), four side square tube section bars (5-2) are arranged on the periphery of the middle square tube section bar (5-1), and each light bar assembly (4) is arranged on the outer vertical surface of the side square tube section bar (5-2); the top of a middle square tube profile (5-1) of a cross profile (5) is fixedly provided with a connecting insertion tube (1) with a plurality of locking ports (1-1) in the middle of the side wall, the top of an inner cavity of the connecting insertion tube (1) is provided with an upper base (3), an upper wiring terminal (2) is arranged on the upper base (3), a lower base (6) is arranged at the middle lower part of the inner cavity of the connecting insertion tube (1), a lower wiring terminal (8) is arranged on the lower base (6), the upper wiring terminal (2) and the lower wiring terminal (8) are connected by adopting a lead wire, and locking pieces (7) are arranged on the outer side of the bottom of the cross profile (5) and between two adjacent side square tube profiles (5-2); when the connecting insertion tube (1) of the next exhibition display lamp device is inserted into the lower end of the middle square tube profile (5-1) of the previous exhibition display lamp device, the upper wiring terminal (2) and the lower wiring terminal (8) are in butt-joint splicing connection, and the lock tongues of the locking pieces (7) are embedded into the locking openings (1-1).

2. The tileable expandable cross-shaped display and presentation light device of claim 1, wherein: the lamp strip assembly (4) comprises a base section bar (4-1), a lamp holder section bar (4-6) and a lampshade (4-3) which are fixedly bonded by sealant (4-8), an LED lamp bead (4-4) and a circuit board (4-5) are installed on the lamp holder section bar (4-6), a power line (4-7) is connected to the circuit board (4-5), the power line (4-7) extends in an inner cavity of the middle square tube section bar (5-1), and the end part of the power line is connected with an upper wiring terminal (2).

3. The tileable expandable cross-shaped exhibition lamp device of claim 2, wherein: the base section bar (4-1) comprises a base plate section bar, and two inner and outer clamping plate section bars are respectively arranged on two sides of the base plate section bar; the lamp holder section bar (4-6) comprises a base plate section bar, two inner and outer clamping plate section bars are respectively arranged on two sides of the base plate section bar, the LED lamp beads (4-4) are installed on the outer vertical face of the base plate section bar of the lamp holder section bar (4-6), and the circuit board (4-5) is installed on the inner vertical face of the base plate section bar of the lamp holder section bar (4-6).

4. A tileable extended cross-shaped exhibition and display lamp device as claimed in claim 3, characterized in that: the lamp holder profile (4-6) is provided with embedded grooves at two sides, the inner wall of the lampshade (4-3) is provided with embedded connecting strips (4-2), and the embedded connecting strips (4-2) are embedded into the embedded grooves.

5. The tileable expandable cross-shaped exhibition and display lamp apparatus of claim 4, wherein: the base section bar (4-1) of the light bar assembly (4) is fixedly connected with the side square tube section bar (5-2) by adopting a side self-tapping screw (10).

6. The tileable expandable cross-shaped display and presentation light device of claim 5, wherein: the locking piece (7) comprises an outer sleeve fixed with the cross-shaped section bar (5), a telescopic bolt is arranged in the outer sleeve, a spring is arranged between the outer sleeve and the bolt, and an operation end block is arranged at the outer end of the bolt.

7. The tileable expandable cross-shaped display and presentation light device of claim 6, wherein: the bottom of the square tube is also provided with a lower cover plate (9) with a through window (9-1) in the middle, the center of each side square tube section (5-2) is provided with a side base section (5-3), the side base section (5-3) is internally provided with a through hole, a corresponding position on the lower cover plate (9) is provided with a connecting hole, and a lower self-tapping screw (11) is arranged in the connecting hole and the through hole.

Images