Quick-change type display board

Abstract

The invention relates to the technical field of information display equipment, in particular to a quick-change type display board which comprises a supporting structure, an upper fixing structure and a lower fixing structure, the upper fixing structure and the lower fixing structure are arranged on the supporting structure, the supporting structure comprises supporting columns which are symmetrically arranged, and the upper fixing structure comprises a reel used for clamping a poster and an upper driving part; the reel is arranged to be an unfoldable part so as to clamp a poster conveniently, the two ends of the reel are rotationally connected with the corresponding supporting columns respectively, the upper driving part is used for driving the reel to unfold or rotate relative to the supporting columns, and the lower fixing structure is arranged below the upper fixing structure and used for clamping the lower end of the poster and comprises a fixing shaft and a lower driving part; the fixing shaft is arranged to be an expandable component used for clamping the lower end of the poster, the two ends of the fixing shaft are slidably connected with the corresponding supporting columns respectively, and the lower driving part is used for driving the fixing shaft to be unfolded. According to the scheme, the structure is simple, the size is small, and the poster can be replaced and rolled without disassembling and assembling any part.

Description

Technical Field

[0001] The invention relates to the technical field of information display equipment, and in particular to a quick-change display board. Background Art

[0002] Since it is often necessary to popularize and display relevant research results and products to guests and customers, it is necessary to use popular science display racks at relevant product locations to display and describe the products so that guests and customers can have an intuitive understanding of the products. In existing popular science display racks, posters used to display content are usually pasted on the panels of the display racks. When the poster area is large, the pasted posters are prone to wrinkles, which affects the appearance and is troublesome when the posters need to be replaced.

[0003] In order to solve the above problems, the inventor has searched and found that the prior art of announcement number CN 111462659 B discloses an advertising display board that is easy to replace advertising cloth, which includes a display stand, a power chamber is provided in the display stand, a power device is provided in the power chamber, a transmission chamber is provided in the display stand, a transmission device is provided in the transmission chamber, a cleaning chamber is provided in the display stand, a cleaning device is provided in the cleaning chamber, a movable chamber is provided in the display stand, a replacement device and a limit device are provided in the movable chamber, the replacement device includes a threaded shaft rotatably arranged on the right wall of the movable chamber and extending left and right, a threaded block connected by a thread is provided on the threaded shaft, a connecting block is connected to the front end of the threaded block, a first sliding groove is provided on the upper and lower sides of the connecting block, and a sliding device is provided in the first sliding groove. There is a first sliding block, the first sliding block is connected to the inner wall of the first sliding groove through a first spring, the first sliding block is connected to a connecting rod, the connecting rod is connected to a pressure rod, the rear end of the pressure rod is connected to a pressure plate, the left end of the threaded shaft is fixedly provided with a first stopper, the bottom wall of the movable cavity is provided with a second sliding groove, the connecting block is located in the second sliding groove, the upper wall of the movable cavity is provided with an air-avoiding groove, the bottom wall of the movable cavity is provided with an empty groove, a movable plate is slidably provided in the empty groove, a fixed shaft is fixed on the movable plate, a roller connected by a torsion spring is provided on the fixed shaft, the fixed shaft can slide in the air-avoiding groove, a baffle is connected to the movable plate, and a glass cover is provided on the front wall of the movable cavity. Although the above-mentioned prior art has the effect of facilitating the replacement of posters to a certain extent, the prior art is complex in structure, large in size, requires the use of electrical components such as motors, and has a high manufacturing cost. Summary of the invention

[0004] In view of the deficiencies of the above-mentioned prior art, the technical problem to be solved by the present invention is: to provide a quick-change display board, which is convenient for replacing posters, has a simple structure and a small size, so as to solve the problems of complex structure, large size and high production cost in the above-mentioned prior art.

[0005] In order to solve the above technical problems, a technical solution adopted by the present invention is: a quick-change display board, comprising a support structure, an upper fixing structure and a lower fixing structure arranged on the support structure;

[0006] The support structure includes symmetrically arranged support columns;

[0007] The upper fixed structure includes a reel that can be used to clamp the poster and an upper driving part, the reel is configured as an expandable component to facilitate clamping the poster, both ends of the reel are rotatably connected to the corresponding support column respectively, and the upper driving part is used to drive the reel to expand or rotate relative to the support column;

[0008] The lower fixed structure is arranged below the upper fixed structure for clamping the lower end of the poster. The lower structure includes a fixed shaft and a lower driving part. The fixed shaft is arranged as an expandable component for clamping the lower end of the poster. Both ends of the fixed shaft are respectively slidably connected to the corresponding support columns. The lower driving part is used to drive the fixed shaft to expand.

[0009] Furthermore, the reel includes a left half shaft and a right half shaft, the left half shaft and the right half shaft are elastically connected via an elastic connector, and the left half shaft and the right half shaft are separated radially of the reel under the drive of the upper drive unit.

[0010] Furthermore, the upper driving part includes an upper transmission shaft of the reel passing through the axis of the reel, an upper wedge block 1 and an upper wedge block 2 arranged on the upper transmission shaft, and upper wedge grooves 1 and 2 cooperating with the upper wedge block 1 and the upper wedge block 2 are respectively provided at two ends of the reel, and the two ends of the upper transmission shaft are respectively rotatably connected to the upper end of the support column, an upper thread segment 1 is provided at one end of the upper transmission shaft, a threaded through hole cooperating with the upper thread segment 1 is provided on the upper wedge block 1, and an upper thread segment 2 with a spiral direction opposite to that of the upper thread segment 1 is provided on the other end of the upper transmission shaft, and a threaded through hole cooperating with the upper thread segment 2 is provided on the upper wedge block 2.

[0011] The transmission shaft is a kind of rotation of the transmission shaft that is used for the rotation of the transmission shaft, and the rotation of the transmission shaft is a kind of rotation of the transmission shaft that is used for the rotation of the transmission shaft.

[0012] Furthermore, the handle includes a handwheel 1 and a transmission rod coaxially fixedly connected to the handwheel, the handwheel 1 is arranged on a side of the support column away from the reel, and a spline hole is provided at one end of the upper transmission shaft close to the handwheel 1 along the axis of the upper transmission shaft, one end of the transmission rod is fixedly connected to the handwheel 1, and the other end of the transmission rod is provided with an external spline that cooperates with the spline hole on the upper transmission shaft and is inserted into the spline hole and slidably connected to the upper transmission shaft, and the circular push plate is coaxially fixedly connected to the transmission rod.

[0013] Further, the fixed shaft includes a left semi-fixed shaft and a right semi-fixed shaft, the left semi-fixed shaft and the right semi-fixed shaft are elastically connected to each other through an elastic connecting member, and the left semi-fixed shaft and the right semi-fixed shaft are separated radially along the fixed shaft under the drive of the lower driving part.

[0014] Furthermore, the lower driving part includes sliders slidably connected to the support columns respectively, a lower transmission shaft through which the fixed shaft is passed along the axis of the fixed shaft, a lower wedge block 1 and a lower wedge block 2 arranged on the lower transmission shaft, and lower wedge grooves 1 and 2 cooperating with the lower wedge block 1 and the lower wedge block 2 are respectively arranged at both ends of the fixed shaft, and the two ends of the lower transmission shaft are respectively rotatably connected to the corresponding sliders, one end of the lower transmission shaft is provided with a lower threaded section 1, and the lower wedge block 1 is provided with a threaded through hole cooperating with the lower threaded section 1, and the other end of the lower transmission shaft A second lower thread segment is provided in the opposite direction of the spiral direction of the first lower thread segment, a threaded through hole matching the second lower thread segment is provided on the second lower wedge block, a fixed rod corresponding to the left semi-fixed shaft and the right semi-fixed shaft is provided on the slider in a direction parallel to the axis of the lower transmission shaft, a lower strip groove matching the fixed rod is provided on the end surface of the left semi-fixed shaft and the right semi-fixed shaft close to the fixed rod along the horizontal radial direction of the fixed shaft, one end of the fixed rod is fixedly connected to the slider, and the other end of the fixed rod is inserted into the lower strip groove. A second hand wheel is provided on the lower transmission shaft for facilitating the rotation of the lower transmission shaft.

[0015] Furthermore, elastic layers are provided on the clamping surfaces where the left semi-axis and the right semi-axis are close to each other and used to clamp the upper end of the poster, and on the clamping surfaces where the left semi-fixed axis and the right semi-fixed axis are close to each other and used to clamp the lower end of the poster.

[0016] Furthermore, the elastic connecting member comprises an elastic band sleeved on both ends of the reel and the fixed shaft, and the elastic band is preferably made of elastic rubber.

[0017] Compared with the prior art, the principles and beneficial effects of the present invention are as follows:

[0018] When the upper wedge block 1 and the upper wedge block 2 do not squeeze the upper wedge groove 1 and the upper wedge groove 2, the left half shaft and the right half shaft are tightly pressed against each other under the elastic force of the elastic band to clamp the upper end of the poster. Similarly, when the lower wedge block 1 and the lower wedge block 2 do not squeeze the lower wedge groove 1 and the lower wedge groove 2, the left half fixed shaft and the right half fixed shaft are tightly pressed against each other to clamp the lower end of the poster. For posters of different heights, the slider can be fixed at different positions on the support column by means of locking screws and screw holes in different positions, so that the poster is in a tensioned state to avoid wrinkles and shaking of the poster that affect the viewing of the displayed information on the poster.

[0019] When the hand wheel 1 is turned in the opposite direction to drive the upper transmission shaft to rotate, the upper wedge block 1 and the upper wedge block 2 move away from each other, and then under the elastic force of the elastic band, the left and right half shafts are pressed tightly against each other to clamp the upper end of the poster.

[0020] To prevent the poster's font and pattern from becoming lighter in color due to prolonged exposure to light, the poster can be rolled up on the reel when it is not needed for display. At this time, first rotate handwheel 2 to force the left half fixed shaft to separate from the right half fixed shaft so that the lower end of the poster is separated from the fixed shaft, and then pull handwheel 1 away from the reel to disengage the limit rod from the upper strip groove so that the reel is in a freely rotatable state, and then turn handwheel 1 to make the upper transmission shaft drive the reel to rotate and roll up the poster.

[0021] The solution has a simple structure and a small size. The poster can be replaced without disassembling any parts. The poster can be quickly replaced and rolled up only by rotating the hand wheel 1 and the hand wheel 2. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0023] Figure 1 The figure is a front view of a quick-change display board according to the present invention.

[0024] Figure 2 for Figure 1 Enlarged view of part A in the middle.

[0025] Figure 3 A schematic diagram of the upper fixed structure from the top view Figure 1 .

[0026] Figure 4 for Figure 3 Middle AA section view.

[0027] Figure 5 for Figure 3 Middle BB section view.

[0028] Figure 6It is a schematic diagram of the position of the scroll, circular push plate and connecting plate when viewed from the left.

[0029] Figure 7 It is a schematic diagram of the structure of the lower fixed structure in the top view.

[0030] Figure 8 A schematic diagram of the upper fixed structure from the top view Figure 2 .

[0031] Fig. 9 for Figure 8 Middle CC section view.

[0032] Fig.10 A schematic diagram of the upper fixed structure from the top view Figure 3 .

[0033] Fig.11 It is a schematic diagram of the scroll structure in the left viewing direction.

[0034] Fig.12 This is a schematic diagram of the fixed axis structure in the left viewing direction.

[0035] Fig.13 It is a schematic diagram of the cooperation between the slider and the slide groove in the left view direction.

[0036] The meanings of the symbols in the accompanying drawings are:

[0037] Support column-10; screw hole-101; cross bar-102;

[0038] Scroll-20; left semi-axis-201; right semi-axis-202; upper wedge-shaped groove-1-204; upper left inclined groove-1-2041; upper right inclined groove-1-2042; upper wedge-shaped groove-2-205; upper left inclined groove-2-2051; upper right inclined groove-2-2052; upper strip-shaped groove-206;

[0039] Upper transmission shaft 210; upper threaded section 1-2101; upper threaded section 2-2102; spline hole 2103; upper wedge block 1-211; upper wedge block 2-212; circular push plate 213; annular groove 2131; connecting plate 214; limit rod 215; hand wheel 1-2161; transmission rod 2162;

[0040] Fixed shaft-30; left semi-fixed shaft-301; right semi-fixed shaft-302; lower left inclined groove 1-3041; lower right inclined groove 1-3042; lower left inclined groove 2-3051; lower right inclined groove 2-3052; lower strip groove-306;

[0041] Lower transmission shaft-310; lower thread section 1-3101; lower thread section 2-3102; lower wedge block 1-311; lower wedge block 2-312; slider-313; slide groove-314; fixing rod-315; hand wheel 2-316;

[0042] Elastic band - 40; Poster - 50; Locking screw - 60. DETAILED DESCRIPTION

[0043] In order to make the purpose, technical solution and advantages of the present application clearer, the technical solution of the present application will be clearly and completely described below in combination with the specific embodiments of the present application and the corresponding drawings. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present application.

[0044] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used in the specification of the present invention herein are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0045] A quick-change display board of this embodiment, combined with Figure 1-Figure 13 As shown, it includes a supporting structure, an upper fixing structure and a lower fixing structure arranged on the supporting structure.

[0046] like Figure 1 As shown, the support structure includes two symmetrically arranged support columns 10, the support columns 10 are vertically arranged, and a cross bar 102 is horizontally arranged at the upper end of the support column 10. The two ends of the cross bar 102 are respectively fixedly connected to the upper ends of the two support columns 10 to fix the two support columns 10 together. Specifically, the cross bar 102 can be fixedly connected to the support column 10 by bolts.

[0047] The upper fixed structure includes a reel 20 for clamping the poster 50 and an upper drive unit. The reel 20 is configured as an expandable component to facilitate clamping the poster 50. Both ends of the reel 20 are rotatably connected to the corresponding support column 10. The upper drive unit is used to drive the reel 20 to expand or rotate relative to the support column 10. Figure 3 , Fig.11 As shown, the reel 20 includes a left half shaft 201 and a right half shaft 202. Elastic bands 40 made of elastic rubber are provided on the outer sleeves of both ends of the reel 20. The elastic bands 40 tighten the left half shaft 201 and the right half shaft 202 together. Semicircular through grooves cooperating with the upper transmission shaft 210 are respectively provided on the left half shaft 201 and the right half shaft 202. When the left half shaft 201 and the right half shaft 202 are fitted together to form the reel 20, the semicircular through grooves on the left half shaft 201 and the right half shaft 202 are enclosed to form a through hole cooperating with the upper transmission shaft 210. Fig. 9As shown, when the upper driving unit drives the left half shaft 201 and the right half shaft 202 to separate radially from the reel 20 so that a gap appears between the left half shaft 201 and the right half shaft 202 , the upper end of the poster 50 can be easily removed from the reel 20 .

[0048] Specifically, combined Figure 1-Figure 6As shown, the upper driving part includes an upper transmission shaft 210 passing through the winding shaft 20 along the axis of the winding shaft 20, an upper wedge block 1 211, an upper wedge block 212, a hand wheel 1 2161, a transmission rod 2162 coaxially fixedly connected to the hand wheel 1 2161, and a limiter arranged on the transmission rod 2162, the upper wedge block 1 211 and the upper wedge block 212 are both vertically arranged, the upper end faces and the lower end faces of the upper wedge block 1 211 and the upper wedge block 212 are both horizontally arranged in parallel, the two sides of the upper wedge block 1 211 and the upper wedge block 212 are vertically faced toward the middle part of the axis of the winding shaft 20, and the small ends are gathered together to form a wedge block in the middle part of the upper transmission shaft 210, and the winding shaft The two ends of the upper transmission shaft 210 are respectively provided with an upper wedge groove 1 204 and an upper wedge groove 205 that cooperate with the upper wedge block 1 211 and the upper wedge block 212. The upper wedge groove 1 204 is formed by the upper left inclined groove 1 2041 at the first end of the left half shaft 201 and the upper right inclined groove 1 2042 at the first end of the right half shaft 202. The upper wedge groove 205 is formed by the upper left inclined groove 2051 at the second end of the left half shaft 201 and the upper right inclined groove 2052 at the second end of the right half shaft 202. The two ends of the upper transmission shaft 210 are respectively connected to the upper end of the support column 10 through thrust bearings. The first end of the upper transmission shaft 210 is provided with There is an upper threaded section 2101, and a threaded through hole cooperating with the upper threaded section 2101 is arranged on the upper wedge block 211 along the center line of the length direction of the upper wedge block 211, and the second end of the upper transmission shaft 210 is provided with an upper threaded section 2102 opposite to the spiral direction of the upper threaded section 2101, and a threaded through hole cooperating with the upper threaded section 2102 is arranged on the upper wedge block 212 along the center line of the length direction of the upper wedge block 212; the handwheel 1 2161 is arranged on the side of the support column 10 away from the reel 20, and the first end of the upper transmission shaft 210 is provided with a spline hole 2103 along the axis of the upper transmission shaft 210, and one end of the transmission rod 2162 is connected to the upper threaded section 2101. The hand wheel 2161 is fixedly connected, and the other end of the transmission rod 2162 is provided with an external spline that cooperates with the spline hole 2103 at the first end of the upper transmission shaft 210 and is inserted into the spline hole 2103 and is slidably connected to the upper transmission shaft 210. The limiting member includes a circular push plate 213 coaxially fixedly connected to the transmission rod 2162, a connecting plate 214 arranged on the side of the support column 10 away from the reel 20, and a limiting rod 215 horizontally symmetrically arranged on both sides of the upper transmission shaft 210. The axis of the limiting rod 215 is coplanar with the axis of the upper transmission shaft 210, and an annular groove 2131 coaxial with the upper transmission shaft 210 is provided on the cylindrical surface of the circular push plate 213. Figure 6As shown, the connecting plate 214 is a U-shaped plate, and part of the plate body of the connecting plate 214 is located in the annular groove 2131 and is slidably connected to the inner wall of the annular groove 2131. The end faces of the left half shaft 201 and the right half shaft 202 close to the connecting plate 214 are both recessed along the horizontal radial direction of the upper transmission shaft 210 with an upper strip groove 206 that cooperates with the corresponding limit rod 215. The limit rod 215 is penetrated by the support column 10, and one end of the limit rod 215 is connected to the connecting plate 214, and the other end of the limit rod 215 passes through the support column 10 and is inserted into the corresponding upper strip groove 206.

[0049] The lower fixed structure is arranged below the upper fixed structure for clamping the lower end of the poster 50. The lower structure includes a fixed shaft 30 and a lower driving part. The fixed shaft 30 is arranged as an expandable component for clamping the lower end of the poster 50. Both ends of the fixed shaft 30 are respectively slidably connected to the corresponding support columns 10. The lower driving part is used to drive the fixed shaft 30 to expand to facilitate the installation or removal of the lower end of the poster 50.

[0050] Specifically, Figure 7 , Fig.12 As shown, the fixed shaft 30 includes a left semi-fixed shaft 301 and a right semi-fixed shaft 302, and elastic bands 40 made of elastic rubber are sleeved on the outer sides of the two ends of the fixed shaft 30, and the elastic bands 40 tighten and fit the left semi-shaft 201 and the right semi-shaft 202 together. The left semi-shaft 201 and the right semi-shaft 202 are respectively provided with semicircular through grooves that cooperate with the upper transmission shaft 210. When the left semi-fixed shaft 301 and the right semi-fixed shaft 302 are fitted together to form the fixed shaft 30, the semicircular through grooves on the left semi-fixed shaft 301 and the right semi-fixed shaft 302 are combined to form a through hole that cooperates with the lower transmission shaft 310. When the lower driving unit is operated to drive the left semi-fixed shaft 301 and the right semi-fixed shaft 302 to separate along the radial direction of the fixed shaft 30 so that a gap appears between the left semi-fixed shaft 301 and the right semi-fixed shaft 302, the lower end of the poster 50 can be conveniently removed from the scroll 20.

[0051] Combination Figure 1 , Fig.13 As shown, similar to the upper driving part, the lower driving part includes a slider 313 slidably connected to the support column 10, a lower transmission shaft 310 passing through the fixed shaft 30 along the axis of the fixed shaft 30, a lower wedge 1 311 and a lower wedge 2 312 arranged on the lower transmission shaft 310, a slide groove 314 is vertically arranged on the support column 10, the slider 313 is arranged in the slide groove 314 and slidably connected to the slide groove 314, and a plurality of screw holes 101 are arranged in sequence up and down on the support column 10 to connect the slide groove 314 with the external space of the support column 10, and the slider 313 can be locked in the slide groove 314 by a set screw threadedly matched with the screw hole 101. Figure 7 As shown, the two ends of the fixed shaft are respectively provided with a lower wedge groove 1 and a lower wedge groove 2 which cooperate with the lower wedge block 1 311 and the lower wedge block 2 312. The lower wedge groove 1 is formed by the lower left oblique groove 1 3041 at the first end of the left semi-fixed shaft 301 and the lower right oblique groove 1 3042 at the first end of the right semi-fixed shaft 302; the lower wedge groove 2 is formed by the lower left oblique groove 2 3051 at the second end of the left semi-fixed shaft 301 and the lower right oblique groove 1 3042 at the first end of the right semi-fixed shaft 302. The lower right inclined groove 2 3052 at the second end of the lower transmission shaft 310 is matched, and the two ends of the lower transmission shaft 310 are respectively rotatably connected with the corresponding slider 313. One end of the lower transmission shaft 310 is provided with a lower threaded section 1 3101, and the lower wedge block 1 311 is provided with a threaded through hole matched with the lower threaded section 1 3101 along the center line of the length direction of the lower wedge block 1 311. The other end of the lower transmission shaft 310 is provided with a threaded through hole in the same direction as the spiral direction of the lower threaded section 1 3101. The second lower threaded section 3102 is opposite, and a threaded through hole that cooperates with the second lower threaded section 3102 is provided on the second lower wedge block 312 along the center line of the length direction of the lower wedge block 312, and a fixing rod 315 corresponding to the left half fixed shaft 301 and the right half fixed shaft 302 is respectively provided on the slider 313 in a direction parallel to the axis of the lower transmission shaft 310, and the two fixing rods 315 are symmetrically arranged on both sides of the lower transmission shaft 310 and arranged coplanar with the lower transmission shaft 310. A lower strip groove 306 that cooperates with the fixing rod 315 is provided on the end surface of the left half fixed shaft 301 and the right half fixed shaft 302 close to the fixing rod 315 along the horizontal radial direction of the fixing shaft, one end of the fixing rod 315 is fixedly connected to the slider 313, and the other end of the fixing rod 315 is inserted into the lower strip groove 306, and a handwheel 2 316 for facilitating the rotation of the lower transmission shaft 310 is provided on the lower transmission shaft 310.

[0052] Furthermore, in order to increase the friction between the poster 50 and the scroll 20 and the fixed axis, an elastic layer made of rubber sheets is attached to the clamping surfaces of the left half axis 201 and the right half axis 202 for clamping the upper end of the poster 50 and the clamping surfaces of the left half fixed axis 301 and the right half fixed axis 302 for clamping the lower end of the poster 50.

[0053] In the present invention, when the upper wedge block 1 211 and the upper wedge block 212 do not squeeze the upper wedge groove 1 204 and the upper wedge groove 2 205, as shown in FIG. Figure 3 As shown, under the elastic force of the elastic band 40, the left half shaft 201 and the right half shaft 202 are pressed against each other to clamp the upper end of the poster 50. Similarly, when the lower wedge block 1 311 and the lower wedge block 2 312 do not squeeze the lower wedge groove 1 and the lower wedge groove 2, as shown in FIG. Figure 7 As shown, the left semi-fixed shaft 301 and the right semi-fixed shaft 302 are closely attached to each other to clamp the lower end of the poster 50. Figure 1 , Figure 7 , Fig.13 As shown, for posters 50 of different heights, the slider 313 can be fixed at different positions on the support column 10 by cooperating with the locking screws 60 and the screw holes 101 at different positions, so that the poster 50 is in a tensioned state to prevent the poster 50 from wrinkling and shaking, which affects the viewing of the displayed information on the poster 50.

[0054] like Figure 8 , Fig. 9 As shown, when the transmission rod 2162 is pushed toward the direction close to the reel 20 so that the limit rod 215 is inserted into the upper strip groove 206, the reel 20 cannot rotate, and the upper wedge block 1 211 and the upper wedge block 212 rotate relative to the upper transmission shaft 210. At this time, when the hand wheel 1 2161 is turned in a certain direction to drive the upper transmission shaft 210 to rotate, the upper transmission shaft 210 will rotate relative to the upper wedge block 1 211 and the upper wedge block 212, so that the upper wedge block 1 211 and the upper wedge block 212 are close to each other under the thread transmission and squeeze the upper wedge groove 1 204 and the upper wedge groove 206. The groove 205 separates the left half shaft 201 and the right half shaft 202 to form a gap that cannot clamp the upper end of the poster 50. At this time, the upper end of the poster 50 can be easily removed from the reel 20. At this time, it is also convenient to put the upper end of a new poster 50 into the gap between the left half shaft 201 and the right half shaft 202. When the hand wheel 1 2161 is rotated in the opposite direction to drive the upper transmission shaft 210 to rotate, the upper wedge block 1 211 and the upper wedge block 2 212 move away from each other, and then under the elastic force of the elastic band 40, the left half shaft 201 and the right half shaft 202 are tightly attached to each other to clamp the upper end of the poster 50.

[0055] In order to prevent the color of the font and pattern of the poster 50 from becoming lighter due to long-term exposure to light, the poster 50 can be rolled up on the reel 20 when it is not needed for display. At this time, the second hand wheel 316 is rotated to force the left half fixed shaft 301 and the right half fixed shaft 302 to separate so that the lower end of the poster 50 is separated from the fixed shaft 30, and then the first hand wheel 2161 is pulled away from the reel 20 to separate the limit rod 215 from the upper strip groove 206 so that the reel 20 is in a freely rotatable state. Fig.10 As shown, the hand wheel 2161 is then turned to make the upper transmission shaft 210 drive the reel 20 to rotate and reel in the poster 50. After reeling in, the hand wheel 2161 is pushed to make the limit rod 215 insert into the upper strip groove 206 to prevent the reel 20 from rotating and releasing the poster 50.

[0056] The above are only embodiments of the present invention, and the common knowledge such as the known specific structures and characteristics in the scheme are not described in detail here. It should be pointed out that for those skilled in the art, several deformations and improvements can be made without departing from the structure of the present invention, which should also be regarded as the protection scope of the present invention, and these will not affect the effect of the implementation of the present invention and the practicality of the patent. The scope of protection required by this application shall be based on the content of its claims, and the specific implementation methods and other records in the specification can be used to interpret the content of the claims.

Claims

1. A quick-change display board, characterized in that: It comprises a supporting structure, an upper fixing structure and a lower fixing structure arranged on the supporting structure; The support structure includes symmetrically arranged support columns; The upper fixed structure includes a reel for clamping a poster and an upper driving part, the reel is configured as an expandable component to facilitate clamping the poster, both ends of the reel are rotatably connected to the corresponding support columns respectively, and the upper driving part is used to drive the reel to unfold or rotate relative to the support column; The lower fixed structure is arranged below the upper fixed structure for clamping the lower end of the poster. The lower structure includes a fixed shaft and a lower driving part. The fixed shaft is arranged as an expandable component for clamping the lower end of the poster. Both ends of the fixed shaft are respectively slidably connected to the corresponding support columns. The lower driving part is used to drive the fixed shaft to expand.

2. The quick-change display board according to claim 1, characterized in that: The reel comprises a left half shaft and a right half shaft, the left half shaft and the right half shaft are elastically connected via an elastic connector, and the left half shaft and the right half shaft are separated radially from each other under the drive of the upper drive unit.

3. The quick-change display board according to claim 2, characterized in that: The upper driving part includes an upper transmission shaft of the reel passing through the axis of the reel, an upper wedge block 1 and an upper wedge block 2 arranged on the upper transmission shaft, two ends of the reel are respectively provided with an upper wedge groove 1 and an upper wedge groove 2 cooperating with the upper wedge block 1 and the upper wedge block 2, two ends of the upper transmission shaft are respectively rotatably connected to the upper end of the support column, one end of the upper transmission shaft is provided with an upper thread segment 1, the upper wedge block 1 is provided with a threaded through hole cooperating with the upper thread segment 1, the other end of the upper transmission shaft is provided with an upper thread segment 2 opposite to the spiral direction of the upper thread segment 1, and the upper wedge block 2 is provided with a threaded through hole cooperating with the upper thread segment 2.

4. The quick-change display board according to claim 3, characterized in that: The transmission shaft is coaxial with the upper transmission shaft, and the transmission shaft is coaxial with the lower transmission shaft, and the transmission shaft can slide along the axial direction of the upper transmission shaft. The transmission shaft comprises a circular push plate coaxially fixedly connected to the handle, a connecting plate arranged on the side of the support column away from the reel, and limit rods horizontally and symmetrically arranged on both sides of the upper transmission shaft. The cylindrical surface of the circular push plate is provided with an annular groove coaxial with the upper transmission shaft. Part of the plate body of the connecting plate is located in the annular groove and is slidably connected to the inner wall of the annular groove. The end surfaces of the left half shaft and the right half shaft are both recessed with upper strip grooves cooperating with the corresponding limit rods along the horizontal radial direction of the upper transmission shaft, one end of the limit rod is connected to the connecting plate, and the other end of the limit rod passes through the support column and is inserted into the corresponding upper strip groove.

5. The quick-change display board according to claim 4, characterized in that: The handle includes a handwheel 1 and a transmission rod coaxially fixedly connected to the handwheel, the handwheel 1 is arranged on a side of the support column away from the reel, and a spline hole is provided at one end of the upper transmission shaft close to the handwheel 1 along the axis of the upper transmission shaft, one end of the transmission rod is fixedly connected to the handwheel 1, and the other end of the transmission rod is provided with an external spline that cooperates with the spline hole on the upper transmission shaft and is inserted into the spline hole and slidably connected to the upper transmission shaft, and the circular push plate is coaxially fixedly connected to the transmission rod.

6. The quick-change display board according to any one of claims 2 to 5, characterized in that: The fixed shaft includes a left semi-fixed shaft and a right semi-fixed shaft, the left semi-fixed shaft and the right semi-fixed shaft are elastically connected via an elastic connector, and the left semi-fixed shaft and the right semi-fixed shaft are separated radially from each other under the drive of the lower drive unit.

7. The quick-change display board according to claim 6, characterized in that: The lower driving part includes sliders that are respectively connected to the support columns for sliding movement, a lower transmission shaft that passes through the fixed shaft along the axis of the fixed shaft, a lower wedge block 1 and a lower wedge block 2 that are arranged on the lower transmission shaft, and lower wedge grooves 1 and 2 that cooperate with the lower wedge block 1 and the lower wedge block 2 are respectively arranged at two ends of the fixed shaft, and the two ends of the lower transmission shaft are respectively connected to the corresponding sliders for rotation, one end of the lower transmission shaft is provided with a lower threaded section 1, and a threaded through hole that cooperates with the lower threaded section 1 is provided on the lower wedge block 1, and the other end of the lower transmission shaft is provided with There is a lower thread segment 2 with a spiral direction opposite to that of the lower thread segment 1, and a threaded through hole matching the lower thread segment 2 is provided on the lower wedge block 2. A fixing rod corresponding to the left semi-fixed shaft and the right semi-fixed shaft is provided on the slider in a direction parallel to the axis of the lower transmission shaft, and a lower strip groove matching the fixing rod is provided on the end surface of the left semi-fixed shaft and the right semi-fixed shaft close to the fixing rod along the horizontal radial direction of the fixing shaft. One end of the fixing rod is fixedly connected to the slider, and the other end of the fixing rod is inserted into the lower strip groove. A hand wheel 2 is provided on the lower transmission shaft for conveniently rotating the lower transmission shaft.

8. The quick-change display board according to claim 7, characterized in that: Elastic layers are provided on the clamping surfaces where the left semi-axis and the right semi-axis are close to each other and are used to clamp the upper end of the poster, and on the clamping surfaces where the left semi-fixed axis and the right semi-fixed axis are close to each other and are used to clamp the lower end of the poster.

9. The quick-change display board according to claim 8, characterized in that: The elastic connecting member comprises an elastic band sleeved on both ends of the reel and the fixed shaft.

Images