CN212103735U - Ultrathin luminous road traffic sign - Google Patents

Abstract

The utility model discloses an ultra-thin type luminous road traffic sign, include sign panel, protection shield and the sign bottom plate of face laminating after to in proper order in the past, be equipped with the reflective membrane of taking the traffic indication picture and text on the lateral surface of sign panel, still including being used for lightening the light source board of traffic indication picture and text on the sign panel, set up on the protection shield with light source board matched with fretwork protection portion, the light source board inlays and locates in the fretwork protection portion, the fretwork degree of depth of fretwork protection portion is greater than the whole thickness of light source board, is used for making the sign panel can not contact and extrude the light source board. The utility model has the advantages of simple and compact structure, convenient manufacture, installation and maintenance, extremely thin whole thickness, high integration level, good luminous effect and aesthetic feeling.

Description

Ultrathin luminous road traffic sign

Technical Field

The utility model relates to a road traffic sign makes the field, especially relates to an ultra-thin type luminous road traffic sign.

Background

With the development of road traffic, the beautification of roads and the improvement of traffic safety requirements, the application of road traffic luminous signs is more and more. These luminous road traffic sign both can play the effect that daytime is normally instructed or night reflection of light instructs, and when the light source board was luminous night at the same time, the marking panel also can the printing opacity make the positive effect that plays the luminous instruction.

In the prior art, the luminous road traffic sign comprises a surface-array luminous sign and a dot-array luminous sign. The planar array type luminous sign is characterized in that the sign panel is made of a fully transparent material, the lamp panel is arranged between the back plate and the sign panel (namely, the light-transmitting panel), the front surface of the sign panel (namely, the light-transmitting panel) is provided with the reflective film with the traffic indication pictures and texts, and the light-transmitting panel can be lightened when the lamp panel is lightened. The dot-matrix luminous sign is characterized in that a sign panel is made of opaque materials, a reflective film with traffic indication pictures and texts is arranged on the front face of the opaque panel, then a plurality of luminous lamp beads are correspondingly arranged according to the traffic indication pictures and texts, and the traffic indication pictures and texts are lightened through the matching of individual light source points when the luminous lamp beads emit light.

In the prior art, some of the above-mentioned luminous road traffic signs have the following technical problems:

firstly, the existing partial label is too thick and complex in structure. The road sign support is formed by a plurality of framework sectional materials, so that the signboard forms a box body structure, a signboard panel is arranged on the front face of the framework sectional materials to form a panel of the box body, a fixing piece is arranged in the framework sectional materials and used for installing a light source plate, a back plate is arranged at the rear part of the framework sectional materials to form a back plate of the box body, and a certain distance is arranged between the signboard panel and the light source plate in the box body to form a cavity. This makes the sign too thick (at least two centimeters thick), the structure is complicated, seriously affects the city's aesthetic appearance.

Secondly, the weight of the prior part of the label is too heavy, so that the prior part of the label is not suitable for the installation and suspension requirements of miniaturization and light weight. And this design makes the manufacturing cost too high.

Thirdly, the lamp panel of the existing part of the signboard is directly embedded on the panel, and then the reflective film is simultaneously adhered on the panel and the lamp panel. This is because there is space or step face between lamp plate, the panel, leads to the reflective membrane difficult to paste, perhaps corrugates after pasting easily, the bubble, and then seriously influences the quality and the use of sign. Secondly, because the lamp plate outside only has one deck reflective membrane, and well known lamp plate (especially circuit board) is very fragile, can not the atress, so this kind of structure can make in transportation and installation, causes the damage to the lamp plate easily, can seriously influence the life of lamp plate, and then has seriously increased subsequent maintenance cost.

Fourth, the existing part of the signs are lighted by direct-insert lamp beads (light emitting diodes), and the direct-insert lamp beads have a certain height all the time, so that the thickness of the whole sign is influenced. Secondly, the lamp beads are not energy-saving and environment-friendly, and the lamp beads are connected in series one by one when being installed and manufactured, so that the working efficiency is very low, and the labor intensity is high.

Fifthly, after the existing part of the labels are installed on the installation rods, solar panels need to be installed on the installation rods for power supply independently, so that the size is large; and the installation and the regulation of the solar panel are very complicated, so that the whole installation process is inconvenient to operate.

SUMMERY OF THE UTILITY MODEL

The to-be-solved technical problem of the utility model is to overcome prior art not enough, provide a simple structure compactness, be convenient for preparation installation and maintenance, whole thickness is extremely thin, the integrated level is high, luminous effectual, have aesthetic ultra-thin type luminous road traffic sign.

In order to solve the technical problem, the utility model discloses a following technical scheme:

the utility model provides an ultra-thin type luminous road traffic sign, includes sign panel, protection shield and the sign bottom plate of face laminating in proper order after to in the past, be equipped with the reflective membrane of taking the traffic indication picture and text on the lateral surface of sign panel, still including being used for lightening the light source board of traffic indication picture and text on the sign panel, seted up on the protection shield with light source board matched with fretwork protection portion, the light source board inlays and locates in the fretwork protection portion, the fretwork degree of depth of fretwork protection portion is greater than the whole thickness of light source board, is used for making the sign panel can not contact and extrude the light source board.

As a further improvement, be equipped with a plurality of LED paster lamp pearls on the light source board, in order to be used for lightening the traffic indication picture and text after giving out light.

As a further improvement, a printing opacity through-hole has all been seted up to every LED paster lamp pearl department on the sign panel, it all is equipped with a lamp pearl lens, in order to be used for forming the luminous road traffic sign of dot matrix to correspond every printing opacity through-hole department on the lateral surface of sign panel.

As a further improvement of the utility model, the sign panel is a light-transmitting plate for forming a surface-array type luminous road traffic sign.

As a further improvement of the present invention, the sign panel, the protection plate and the sign bottom plate are fixedly connected by a screw member or a rivet member or by welding or gluing.

As a further improvement of the utility model, the border department all around of sign panel, protection shield and sign bottom plate scribbles the waterproof glue of round.

As a further improvement, be fixed with a plurality of convex set screws on the medial surface of sign panel, all be equipped with a plurality of location mounting holes that correspond with the screw position on protection shield and the sign bottom plate, be used for making set screw pass in proper order behind the location mounting hole with the nut cooperation in order to be in the same place sign panel, protection shield and sign bottom plate locking fixation.

As a further improvement, the back connection who marks the bottom plate has a vertical installation pole, the top cover of installation pole is equipped with an adjusting rod, install the solar panel that is used for supplying power to the light source board on the regulation pole, adjust the pole can be around installation pole axle center rotation, in order to be used for adjusting solar panel's installation direction.

As a further improvement, the light source board passes through battery control module and is connected with the solar panel electricity, be equipped with in the regulation pole and hold the chamber, in order to be used for placing battery control module, along radially wearing to be equipped with more than two adjusting screw, being used for when adjusting the pole and rotate to the position back with adjusting screw in and top tight installation pole, so that adjust the pole and be fixed in on the installation pole.

As a further improvement of the utility model, the circumferential surface at the top of the mounting rod is provided with a spacing groove with a circle of concave inwards for leading the adjusting screw rod to extend into the spacing groove.

Compared with the prior art, the utility model has the advantages of:

firstly, the utility model discloses an ultra-thin type luminous road traffic sign, the light source board inlays and locates in the fretwork protection portion, make light source board and protection shield be the coplanar, then will mark the panel again, protection shield and mark the laminating of the face of bottom plate face in the past after to in proper order, make this mark only mark the panel, protection shield and mark three layer thickness of bottom plate, the whole thickness of traffic sign can be controlled about centimetre to centimetre, this compares with the several centimetre thickness of current sign, thickness greatly reduced, no matter be the promotion of pleasing to the eye degree, still wholly hang the lightening of quality, or hang the reduction of occupation space, all gained splendid useful technological effect.

Secondly the utility model discloses an ultra-thin type luminous road traffic sign, when above-mentioned realization ultra-thin structure, still fine compromise product security and life. Through special protection shield and fretwork protection portion of design for the protection that receives the protection of protection shield all around the light source board, more importantly makes the sign panel can not contact and extrude on the light source board. The reflective film can be adhered to the integral sign panel, so that the sign panel is easy to adhere and cannot have the quality problems of wrinkling and foaming. Secondly, the light source board is protected by the sign panel but can not contact the sign panel, so that in the transportation and installation process, the light source board is well protected and is not easy to damage the light source board (especially when the LED patch lamp bead board is adopted, the lamp bead board is more fragile), the service life of the light source board is greatly prolonged, and the subsequent maintenance cost is greatly reduced.

Thirdly, the utility model discloses an ultra-thin type luminous road traffic sign's is sealed effectual, mark panel, protection shield and mark bottom plate in the past to the laminating of back face in proper order for can form splendid water proof protection to being in the light source board that marks in the inside fretwork protection portion, sealed effect is splendid, can not appear the risk that the rainwater got into erosion light source board in the fretwork protection portion, has reduced the maintenance cost, has improved the life who marks.

Fourthly the utility model discloses an ultra-thin type luminous road traffic sign, the light source board that LED paster lamp pearl was made makes thickness for traditional lamp pearl that cut straightly, and thickness is thinner, and then makes the whole thickness greatly reduced also of traffic sign. Secondly, the manufacturing method is more efficient and the working cost is relatively lower. And compared with the traditional direct-insert lamp bead, the LED surface-mounted lamp bead is more energy-saving and environment-friendly.

Fifthly the utility model discloses a luminous road traffic sign of ultra-thin type, set screw and location mounting hole can realize firstly that the three locking is fixed, secondly can realize the location, and then make the mark panel of face laminating, protection shield and mark the accurate to it of bottom plate three, have also guaranteed that subsequent is luminous accurate.

Sixth is the utility model discloses an ultra-thin type luminous road traffic sign, the back connection who marks the bottom plate has a vertical installation pole, through above special scientific design, firstly makes originally to have marked integrated solar panel, not only is convenient for mark the installation of body through the installation pole, also is convenient for solar panel's integral type installation. Secondly, through setting up the regulation pole of establishing of cover for the installation direction that can nimble adjustment solar panel during the installation, the solar panel of being convenient for forms the best photic state.

Seventhly, the utility model discloses an ultra-thin type luminous road traffic sign holds the chamber and further is convenient for battery control module, solar panel's integrated form installation, need not set up other outer hanging boxes and holds battery control module. Simultaneously, through the spacing groove that sets up the indent for even adjusting screw is not the tight state in top, because adjusting screw stretches into the spacing inslot, make the adjusting lever at the in-process of rotation regulation, adjust the pole and also can not the landing down, after the adjustment targets in place, further screw adjusting screw, make adjusting screw can further stretch into the spacing inslot and push up tight installation pole.

Drawings

Fig. 1 is a schematic diagram 1 of the explosion structure principle of the ultra-thin luminous road traffic sign of the present invention.

Fig. 2 is a schematic diagram 2 of the explosion structure principle of the ultra-thin luminous road traffic sign of the present invention.

Fig. 3 is a schematic view of the front view structure of the ultra-thin luminous road traffic sign of the present invention.

Fig. 4 is a schematic view of the partial structure of the ultra-thin luminous road traffic sign of the present invention.

The reference numerals in the figures denote:

1. a sign panel; 11. a light-transmitting through hole; 12. a lamp bead lens; 13. a screw; 2. a protection plate; 21. a hollowed-out protection part; 3. marking a bottom plate; 4. a light-reflecting film; 5. a light source plate; 51. LED paster lamp beads; 6. mounting a rod; 61. a limiting groove; 7. adjusting a rod; 71. adjusting the screw rod; 8. a solar panel; 9. and a battery control module.

Detailed Description

The invention will be described in further detail with reference to the drawings and specific examples.

As shown in fig. 1 to 4, the utility model provides an ultra-thin type luminous road traffic sign, include sign panel 1, protection shield 2 and sign bottom plate 3 of face laminating after to in proper order in the past, also be the laminating of 2 faces of sign panel 1 and protection shield, the laminating of 3 faces of protection shield 2 and sign bottom plate. Be equipped with the reflective membrane 4 of taking traffic indication picture and text on the lateral surface of sign panel 1 (reflective membrane 4 pastes on sign panel 1 in this embodiment), still including being used for lightening the light source board 5 of the picture and text of traffic indication on sign panel 1, offer on the protection shield 2 with light source board 5 matched with fretwork protection portion 21, light source board 5 inlays and locates in fretwork protection portion 21, the fretwork degree of depth of fretwork protection portion 21 is greater than the whole thickness of light source board 5, be used for making sign panel 1 can not contact and extrude light source board 5. In the present embodiment, as shown in the figure, only one hollow protection portion 21 is provided on the protection plate 2, and only one light source plate 5 is also provided; of course, in other embodiments, a plurality of hollow-out protecting portions 21 may be formed on the protecting plate 2 according to the lighting requirement, and one light source plate 5 is disposed in each hollow-out protecting portion 21. Regarding the light source board 5, a straight-through lamp bead form may be adopted, and an optimized form of the LED patch lamp bead described below may be further adopted, which is not limited in this embodiment. Meanwhile, in the present embodiment, the light source plate 5 in the hollow protection part 21 is fixed on the sign base plate 3 by adhesion; in other embodiments, the light source plate 5 in the hollow protection part 21 may be fixed to the protection plate 2 by clamping. Through the special scientific design, the method has the following advantages:

firstly, the utility model discloses an ultra-thin type luminous road traffic sign, light source plate 3 inlays and locates in fretwork protection portion 21, make light source plate 3 and protection shield 2 be the coplanar, then again with marking panel 1, protection shield 2 and marking bottom plate 3 face laminating in the past to the back in proper order, make this mark only marking panel 1, protection shield 2 and marking bottom plate 3 three layer thickness, the whole thickness of traffic sign can be controlled about 0.7 centimetre to 1 centimetre, this compares with the several centimetres of current sign thick, thickness greatly reduced, no matter be the promotion of pleasing to the eye degree, still wholly hang the quality alleviate, or hang the reduction of occupation space, all gain splendid useful technological effect.

Secondly the utility model discloses an ultra-thin type luminous road traffic sign, when above-mentioned realization ultra-thin structure, still fine compromise product security and life. Through the special protection shield 2 of design and fretwork protection portion 21 for light source plate 3 receives the protection of protection shield 2 all around, more importantly makes sign panel 1 can not contact and extrude on the light source plate 5. The first is that the reflective film can be pasted on the integrated sign panel 1, which is not only easy to paste, but also can not generate the quality problems of wrinkling and bubbling. Secondly, the light source plate 3 is protected by the sign panel 1, but can not contact the sign panel 1, so that in the transportation and installation process, the light source plate 3 is well protected, the light source plate 3 is not easy to be damaged (especially when the LED patch lamp bead plate is adopted, the lamp bead plate is more fragile), the service life of the light source plate 3 is greatly prolonged, and the subsequent maintenance cost is greatly reduced.

Thirdly, the utility model discloses an ultra-thin type luminous road traffic sign's is sealed effectual, sign panel 1, protection shield 2 and sign bottom plate 3 face laminating after to in the past in proper order for can form splendid water proof to being in the light source board 3 that marks in inside fretwork protection part 21, sealed effect is splendid, the risk that the rainwater got into erosion light source board 3 in the fretwork protection part 21 can not appear, has reduced the maintenance cost, has improved the life who marks.

Further, in the preferred embodiment, a plurality of LED patch lamp beads 51 are disposed on the light source board 5 for illuminating the traffic indication text after light emission. Light source board 5 that LED paster lamp pearl 51 was made makes thickness further thinner for traditional lamp pearl of cutting straightly, and then makes the whole thickness of traffic sign also further greatly reduced. Secondly, the manufacturing method is more efficient and the working cost is relatively lower. And thirdly, the LED patch lamp beads 51 are more energy-saving and environment-friendly compared with the traditional direct-insert lamp beads. Foretell protection shield 2 and the special design of fretwork protection part 21 can form fine protection to the light source board 5 that LED paster lamp pearl 51 was made, and then just also fine further guaranteed ultra-thin realization, so light source board 5 and sign panel 1, protection shield 2, the sign bottom plate 3 that LED paster lamp pearl 51 was made mutually support, each other.

As shown in fig. 1, further, in a preferred embodiment, a light-transmitting through hole 11 is formed on the sign panel 1 corresponding to each LED patch lamp bead 51, and a lamp bead lens 12 is disposed on the outer side surface of the sign panel 1 corresponding to each light-transmitting through hole 11 for forming a dot-matrix light-emitting road traffic sign. That is, the sign panel 1 in this embodiment is a light-tight panel, and after the light emitted by the LED patch lamp beads 51 passes through the light-transmitting through holes 11, the light-emitting indication is formed to the outside through the lamp bead lenses 12. In this embodiment, the lamp bead lens 12 is clamped and adhered to the sign panel.

Of course, in other embodiments, the sign panel 1 may also be designed as a light-transmitting panel for forming a matrix-type light-emitting road traffic sign (the matrix-type light-emitting road traffic sign is not shown in the drawings). That is, the whole sign panel 1 can be directly lighted without designing the light-transmitting through holes 11 and the lamp bead lenses 12 on the sign panel 1 and through the light-transmitting performance of the sign panel 1.

Further, in the preferred embodiment, the sign panel 1, the protection plate 2 and the sign base plate 3 are fixedly connected by means of screw members or rivet members or by welding or gluing. In order to further ensure the sealing performance, a circle of waterproof glue can be coated on the peripheral edges of the sign panel 1, the protection plate 2 and the sign bottom plate 3.

As shown in fig. 1, further, in the preferred embodiment, a plurality of protruding positioning screws 13 are fixed on the inner side surface of the sign panel 1, and a plurality of positioning mounting holes corresponding to the positions of the screws 13 are respectively formed on the protection plate 2 and the sign base plate 3, so that the positioning screws 13 sequentially pass through the positioning mounting holes and then cooperate with nuts to lock and fix the sign panel 1, the protection plate 2 and the sign base plate 3 together. Set screw 13 and location mounting hole can realize firstly that the three locking is fixed, secondly can realize the location, and then make the sign panel 1 of face laminating, protection shield 2 and sign 3 three of bottom plate accurate to it, have also guaranteed subsequent luminous accurate.

As shown in fig. 1 to 4, further, in the preferred embodiment, a vertical mounting rod 6 is connected to the back of the sign base plate 3, and the mounting rod 6 may be welded or fixedly connected to the sign base plate 3 by a hoop member or the like. The bottom of the installation rod 6 can be directly inserted into the main installation rod on the road surface, and then the installation rod is fixed through other fixing pieces, so that the mark can be installed quickly. Meanwhile, the top end of the mounting rod 6 is sleeved with an adjusting rod 7, the adjusting rod 7 is provided with a solar panel 8 used for supplying power to the light source plate 5, and the adjusting rod 7 can rotate around the axis of the mounting rod 6 to adjust the mounting direction of the solar panel 8. Through above special scientific design, firstly make originally mark integrated solar panel 8, not only be convenient for mark the installation of body through installation pole 6, also be convenient for solar panel 8's integral type installation. Secondly, through setting up the regulation pole 7 of establishing of cover for can be nimble during the installation adjust solar panel 8 the installation direction, be convenient for solar panel 8 forms the best photic state.

As shown in fig. 1 and 4, further, in the preferred embodiment, the light source board 5 is electrically connected to the solar panel 8 through the battery control module 9, the adjusting rod 7 is provided with a receiving cavity for placing the battery control module 9, two or more adjusting screws 71 are radially inserted into the circumferential surface at the bottom end of the adjusting rod 7, and the adjusting screws 71 are screwed into and tightly push the mounting rod 6 after the adjusting rod 7 is rotated to the proper position, so that the adjusting rod 7 is fixed on the mounting rod 6. In the present embodiment, a circle of concave limiting grooves 61 is provided on the circumferential surface at the top end of the mounting rod 6 for the adjusting screw 71 to extend into the limiting grooves 61. The accommodating cavity is convenient for the integrated installation of the battery control module 9 and the solar panel 8, and other externally-hung boxes are not needed to accommodate the battery control module 9. Meanwhile, through the arrangement of the concave limiting groove 61, after the adjusting rod 7 is adjusted in place in a rotating mode, the adjusting screw rod 71 is further screwed, so that the adjusting screw rod 71 can further extend into the limiting groove 61 and tightly push the mounting rod 6, locking limiting is formed, and the adjusting rod 7 cannot be pulled out. Meanwhile, due to the arrangement of the limiting groove 61, even if the adjusting screw 71 is not in a tightly-pushing state, the adjusting screw 71 extends into the limiting groove 61, so that the adjusting rod 7 cannot slide down in the rotating and adjusting process of the adjusting rod 7. Of course, in order to solve the problem of landing downwards, as shown in the figure, the utility model discloses further top department at installation pole 6 is equipped with a step portion (as shown in fig. 4A department), also should install the external diameter of the top department of pole 6 and be less than the external diameter of the installation pole 6 body of below promptly, this makes to adjust pole 7 cover and establishes the back, adjusts the outer periphery of pole 7 and the outer periphery of installation pole 6 body and is the same face, this is not only pleasing to the eye, the leakproofness is better, also make simultaneously to adjust pole 7 cover even do not have tight adjusting screw 71 in top after establishing, adjust pole 7 can not landing downwards yet.

Although the present invention has been described with reference to the preferred embodiments, it is not intended to limit the present invention. The technical solution of the present invention can be used by anyone skilled in the art to make many possible variations and modifications, or to modify equivalent embodiments, without departing from the scope of the technical solution of the present invention, using the technical content disclosed above. Therefore, any simple modification, equivalent change and modification made to the above embodiments by the technical entity of the present invention should fall within the protection scope of the technical solution of the present invention.

Claims (10)

1. An ultra-thin luminous road traffic sign, characterized in that: including sign panel (1), protection shield (2) and sign bottom plate (3) of face laminating in proper order after to in the past, be equipped with on the lateral surface of sign panel (1) and take reflection of light membrane (4) of traffic indication picture and text, still including being used for lightening light source board (5) of traffic indication picture and text on sign panel (1), seted up on protection shield (2) with light source board (5) matched with fretwork protection portion (21), light source board (5) inlay locate in fretwork protection portion (21), the fretwork degree of depth of fretwork protection portion (21) is greater than the whole thickness of light source board (5), is used for making sign panel (1) can not contact and extrude light source board (5).

2. The ultra-thin, luminous road traffic sign of claim 1, wherein: a plurality of LED patch lamp beads (51) are arranged on the light source plate (5) and used for lighting traffic indication pictures and texts after light emitting.

3. The ultra-thin, luminous road traffic sign of claim 2, wherein: a light-transmitting through hole (11) is formed in the position, corresponding to each LED patch lamp bead (51), on the sign panel (1), a lamp bead lens (12) is arranged in the position, corresponding to each light-transmitting through hole (11), on the outer side face of the sign panel (1) so as to form a dot-matrix light-emitting road traffic sign.

4. The ultra-thin, luminous road traffic sign of claim 2, wherein: the sign panel (1) is a light-transmitting plate and is used for forming a surface-array type luminous road traffic sign.

5. The ultra-thin, luminous road traffic sign of claim 1, wherein: the sign panel (1), the protection plate (2) and the sign bottom plate (3) are fixedly connected through screw pieces or rivet pieces or welding or gluing.

6. The ultra-thin, luminous road traffic sign of claim 1, wherein: and a circle of waterproof glue is coated on the edges of the periphery of the sign panel (1), the protection plate (2) and the sign bottom plate (3).

7. The ultra-thin, luminous road traffic sign of claim 1, wherein: be fixed with a plurality of convex set screws (13) on the medial surface of sign panel (1), all be equipped with a plurality of location mounting holes that correspond with screw (13) position on protection shield (2) and sign bottom plate (3), be used for making set screws (13) pass in proper order behind the location mounting hole with the nut cooperation in order to be in the same place sign panel (1), protection shield (2) and sign bottom plate (3) locking fixation.

8. The ultra-thin, luminous road traffic sign of claim 1, wherein: the back of sign bottom plate (3) is connected with a vertical installation pole (6), the top cover of installation pole (6) is equipped with an regulation pole (7), install on adjusting pole (7) and be used for solar panel (8) to light source board (5) power supply, adjust pole (7) can be around installation pole (6) axle center rotation, in order to be used for adjusting the installation direction of solar panel (8).

9. The ultra-thin, luminous road traffic sign of claim 8, wherein: the solar battery adjusting device is characterized in that the light source plate (5) is electrically connected with the solar panel (8) through the battery control module (9), an accommodating cavity is formed in the adjusting rod (7) and used for accommodating the battery control module (9), more than two adjusting screw rods (71) penetrate through the circumferential surface at the bottom end of the adjusting rod (7) along the radial direction, and the adjusting screw rods (71) are screwed in and tightly push the mounting rod (6) after the adjusting rod (7) rotates in place so that the adjusting rod (7) is fixed on the mounting rod (6).

10. The ultra-thin, luminous road traffic sign of claim 9, wherein: a circle of concave limiting grooves (61) are formed in the circumferential surface of the top end of the mounting rod (6) and used for enabling the adjusting screw rods (71) to extend into the limiting grooves (61).

Images