Replaceable signage display device for urban old streets

Abstract

The utility model discloses an urban old street replaceable signage display device which comprises a supporting frame, the supporting frame comprises a transparent plate and a supporting plate connected with the transparent plate, the supporting plate is connected with a wall body, an installation space is formed between the supporting plate and the transparent plate, and the transparent plate is arranged in the installation space. The bottom of the supporting plate is provided with a mounting opening penetrating through the supporting plate, the mounting opening is communicated with the mounting space, the display panel is arranged in the mounting space, a limiting assembly is arranged in the mounting space, the limiting assembly is suitable for being connected with the display panel so as to be suitable for fixing the display panel, and a sealing assembly is arranged in the mounting space. The sealing assembly is located at the mounting opening, the sealing assembly comprises a connecting mechanism and a cover plate, the connecting mechanism is suitable for being connected with the cover plate and the inner wall of the mounting opening, the display plate is arranged in the supporting frame in an inserted connection mode, the display plate is prevented from making contact with the outside, the display plate is limited through the limiting assembly, and stability is improved.

Description

Technical Field

[0001] This utility model relates to the field of display board technology, specifically to a replaceable shop sign display device for old urban streets. Background Technology

[0002] Currently, in the context of urban development and commercial renewal, the shop signs and display devices on old streets are facing frequent replacement needs. Traditionally, when shop signs in old residential areas need to be updated, the usual practice is to completely remove the original shop sign display panels and their structural components, and then reinstall brand new shop signs. This traditional replacement method has many shortcomings.

[0003] A search revealed a Chinese utility model patent with authorization announcement number CN205645181U, which discloses a suspended shop sign. This patent consists of two symmetrical frames and replaceable sign panels. Two connecting plates are screwed to the rear of the frames, each with a load-bearing plate. An insertable mounting plate is installed at the other end of the load-bearing plate for wall connection. This device allows for flexible replacement of the sign panels to meet advertising needs, and its stable structure makes it easy to disassemble and maintain without welding. However, while this patent avoids the problem of repeatedly disassembling and reassembling the entire structure each time the display panel is replaced, the direct exposure of the display panel affects its aesthetics and may lead to damage to the display surface over time. Furthermore, the lack of sufficient support and limiting components to restrain the display panel in various ways makes it impossible to guarantee the stability of the insertion. Utility Model Content

[0004] The technical problem to be solved by this utility model is to overcome the defects in the prior art. The display board is placed in the support frame by plugging it in, which avoids contact with the outside world and restricts the display board by limiting components, thereby improving stability.

[0005] To solve the above-mentioned technical problems, the technical solution of this utility model is a replaceable shop sign display device for old urban streets, comprising:

[0006] A support frame, comprising a transparent panel and a support plate connected to the transparent panel, the support plate being connected to a wall;

[0007] An installation space is formed between the support plate and the transparent plate. The bottom of the support plate has a through-hole for installation, which communicates with the installation space.

[0008] A display panel is placed within the installation space, and a limiting component is provided within the installation space. The limiting component is adapted to be connected to the display panel to fix the display panel.

[0009] A closing assembly is arranged at the mounting opening, which includes a connecting mechanism and a cover plate, the connecting mechanism is suitable for connecting the cover plate and the inner wall of the mounting opening respectively, and the cover plate is suitable for being actuated to drive the connecting mechanism to move, so as to cover or open the mounting opening to the outside;

[0010] A self-locking mechanism is suitable for limiting the cover plate when the cover plate closes the mounting opening.

[0011] Further, the connecting mechanism includes a hinged rod one, a hinged rod two and a fixed seat;

[0012] The fixed seat is arranged at the mounting opening, one end of the hinged rod two is hingedly connected with the fixed seat, the other end of the hinged rod two is provided with a fixed shaft on one side, one end of the hinged rod one is movably sleeved on the fixed shaft, and the other end of the hinged rod one is hingedly connected with the cover plate.

[0013] Further, the limiting assembly includes an upper limiting mechanism and a lower limiting mechanism;

[0014] The upper limiting mechanism is suitable for being in contact with and limiting the upper end of the display panel;

[0015] The lower limiting mechanism is suitable for being in contact with and limiting the lower end of the display panel.

[0016] Further, the upper limiting mechanism includes a placing plate, an upper limiting block and a matching block;

[0017] The placing plate is arranged in the mounting space and connected with the support plate, the upper limiting block is connected to the top of the side of the placing plate away from the support plate, and the upper limiting block and the support plate form an upper limiting space therebetween;

[0018] The matching block is connected with the display panel, and the matching block is arranged in the upper limiting space and in contact with the upper limiting block.

[0019] Further, the lower limiting mechanism is two lower limiting blocks, and the two lower limiting blocks are connected with the hinged rod two;

[0020] The two lower limiting blocks form a lower limiting space, and the bottom of the display panel is inserted into the lower limiting space when the mounting opening is in a closed state.

[0021] Further, the self-locking mechanism is a threaded hole one arranged at the bottom of the support plate and a threaded hole two arranged on the cover plate and penetrating through the cover plate;

[0022] When the cover plate covers the mounting hole, the threaded hole one is coaxially arranged with the threaded hole two, and the threaded hole one and the threaded hole two are adapted to be penetrated by a bolt to connect the support plate and the cover plate.

[0023] Further, the self-locking mechanism comprises a clamping block, a retracting block and a retracting mechanism.

[0024] The clamping block is connected with the cover plate, and the retracting block and the retracting mechanism are arranged in the support plate.

[0025] The retracting block is provided with a clamping groove, and the clamping block is inserted into the clamping groove when the cover plate covers the mounting hole.

[0026] Further, the support plate is provided with a moving cavity and a cavity, the moving cavity is connected with the cavity, and the cavity is connected with the outside space of the support plate.

[0027] The retracting block and the retracting mechanism are arranged in the moving cavity, and the cavity is adapted to provide a space for the clamping block to move.

[0028] Further, the retracting mechanism comprises a telescopic rod and a spring, the telescopic rod is arranged in the moving cavity, one end of the telescopic rod is connected with the retracting block, the other end of the telescopic rod extends to the outside of the support plate, and the telescopic rod is adapted to slide in the support plate.

[0029] The spring is sleeved on the outside of the telescopic rod, one end of the spring is connected with the retracting block, and the other end of the spring is connected with the inner wall of the moving cavity.

[0030] The moving cavity is connected with a sliding rail, and the bottom of the retracting block is provided with a sliding block.

[0031] The upper end of the clamping block is provided with a first inclined surface, and the lower end of the retracting block is provided with a second inclined surface.

[0032] Further, the cover plate is provided with an extension plate, the extension plate is provided with a sealing gasket, and the sealing gasket on the extension plate is adapted to be in contact with the inner wall of the cavity when the cover plate covers the mounting hole.

[0033] By adopting the above technical scheme, the utility model has the following beneficial effects:

[0034] 1、 Through the setting of installation space and installation port and the like structure, the support frame is formed by the transparent plate and the supporting plate, the installation space is arranged between the transparent plate and the supporting plate, the installation port is arranged at the bottom of the support frame, the display board is inserted into the installation space from the installation port when placed, the whole display board is located in the inside of the support frame, damage caused by contact with the outside world is avoided, the installation port is closed by the cover plate, the connecting mechanism arranged between the cover plate and the installation port can make the cover plate connected with the support frame no matter what state it is in, and the cover plate is not easy to lose.

[0035] 2、 Through the setting of upper limiting mechanism and lower limiting block and the like structure, after the display board is placed in the installation space, the upper end of the display board is limited by the upper limiting mechanism, and then the lower end of the display board is limited by the lower limiting block, so that the display board is limited at multiple points, the stability of the display board installation is improved, and the display board position is prevented from being offset and unable to accurately display the information to be transmitted.

[0036] 3、 Through the setting of self-locking mechanism and the like structure, when the cover plate closes the installation port, the clamping block arranged on the cover plate is inserted into the contraction block of the self-locking mechanism, the position of the clamping block is limited by the contraction block, so that the limiting effect of the cover plate is achieved, when disassembling, the extension rod connected with the contraction block is pulled out, so that the contraction block is driven to move, the limitation of the clamping block is released, so that the cover plate and the installation port are opened and the display board is taken out, the whole is more convenient to install and disassemble, and a specific tool is not needed. BRIEF DESCRIPTION OF DRAWINGS

[0037] Figure 1 It is the installation port closing state schematic view of the utility model;

[0038] Figure 2 It is the installation port opening state schematic view of the utility model;

[0039] Figure 3 It is the support frame of the utility model; Figure 1 It is the enlarged view of A in the middle;

[0040] Figure 4 It is the support frame of the utility model; Figure 2 It is the enlarged view of B in the middle;

[0041] Figure 5 It is the support frame of the utility model; Figure 1 It is the enlarged view of C in the middle;

[0042] Figure 6 It is the support frame of the utility model; Figure 1 It is the enlarged view of D in the middle.

[0043] In the drawing: 1, support frame; 11, transparent plate; 12, supporting plate; 13, installation space; 14, installation port;

[0044] 2, display panel;

[0045] 3. Upper limit mechanism; 31. Placement plate; 32. Upper limit block; 33. Mating block;

[0046] 4. Cover plate;

[0047] 5. Connecting mechanism; 51. Hinge rod one; 52. Hinge rod two; 53. Fixed base;

[0048] 6. Self-locking mechanism; 61. Cavity; 62. Moving cavity; 63. Retractable block; 64. Slide rail; 65. Locking block; 66. First inclined surface; 67. Second inclined surface; 68. Extension plate; 69. Telescopic rod; 610. Spring;

[0049] 7. Lower limit block; 8. Wall. Detailed Implementation

[0050] To make the contents of this utility model easier to understand, the present utility model will be further described in detail below with reference to specific embodiments and accompanying drawings.

[0051] Example 1

[0052] like Figures 1-2 As shown, a replaceable shop sign display device for old urban streets includes:

[0053] Support frame 1, which includes a transparent plate 11 and a support plate 12 connected to the transparent plate 11, and the support plate 12 is connected to the wall 8;

[0054] An installation space 13 is formed between the support plate 12 and the transparent plate 11. The bottom of the support plate 12 has an installation opening 14 that penetrates through it, and the installation opening 14 communicates with the installation space 13.

[0055] Display panel 2 is placed in installation space 13. Limiting components are provided in installation space 13. The limiting components are adapted to be connected to display panel 2 to fix display panel 2.

[0056] The sealing component is located at the mounting port 14. The sealing component includes a connecting mechanism 5 and a cover plate 4. The connecting mechanism 5 is adapted to connect the cover plate 4 and the inner wall of the mounting port 14 respectively. The cover plate 4 is adapted to be actuated to drive the connecting mechanism 5 to move, thereby covering or opening the passage between the mounting port 14 and the outside.

[0057] Self-locking mechanism 6 is adapted to limit the cover plate 4 when the cover plate 4 closes the mounting port 14.

[0058] like Figure 3 As shown, the connecting mechanism 5 includes a first hinge rod 51, a second hinge rod 52, and a fixed base 53;

[0059] The fixed seat 53 is arranged at the mounting port 14, the fixed seat 53 is hingedly connected with one end of the second hinged rod 52, one side of the other end of the second hinged rod 52 is provided with a fixed shaft, one end of the first hinged rod 51 is movably sleeved on the fixed shaft, and the other end of the first hinged rod 51 is hingedly connected with the cover plate 4.

[0060] As shown in Figure 2 , the limiting assembly includes an upper limiting mechanism 3 and a lower limiting mechanism;

[0061] The upper limiting mechanism 3 is adapted to be in contact with and limit the upper end of the display panel 2;

[0062] The lower limiting mechanism is adapted to be in contact with and limit the lower end of the display panel 2.

[0063] As shown in Figure 5 , the upper limiting mechanism 3 includes a placement plate 31, an upper limiting block 32 and a matching block 33;

[0064] The placement plate 31 is located in the mounting space 13 and connected with the support plate 12, the upper limiting block 32 is connected to the top of the side of the placement plate 31 away from the support plate 12, and the upper limiting space is formed between the upper limiting block 32 and the support plate 12;

[0065] The matching block 33 is connected with the display panel 2, and the matching block 33 is located in the upper limiting space and in contact with the upper limiting block 32.

[0066] As shown in Figure 3 , the lower limiting mechanism is two lower limiting blocks 7, and the two lower limiting blocks 7 are connected on the second hinged rod 52;

[0067] The lower limiting space is formed between the two lower limiting blocks 7, and the bottom of the display panel 2 is inserted into the lower limiting space when the mounting port 14 is in a closed state.

[0068] The working principle of the embodiment is as follows:

[0069] The entire support frame 1 is divided into a transparent plate 11 and a support plate 12, wherein the support plate 12 is connected with the wall 8 through bolts and the like, the space between the transparent plate 11 and the support plate 12 is a mounting space 13, and the bottom of the support plate 12 is provided with a mounting port 14, the display panel required by the store sign is placed in the mounting space 13 by passing through the mounting port 14, and the mounting port 14 is closed by the cover plate 4 after the display panel is placed, at this time, the display panel is located in the entire support frame 1, avoiding contact with the outside world and being not easy to be damaged, the transparent plate 11 is of transparent material, and glass material can be selected;

[0070] A connecting mechanism 5 is connected between the cover plate 4 and the support frame 1, which can avoid the loss of the cover plate 4, causing the mounting port 14 to be unable to be closed. The fixing seat 53 in the connecting mechanism 5 is arranged on the inner wall of the mounting port 14, the hinged rod two 52 is hinged on the fixing seat 53, and the hinged rod one 51 is hinged on the hinged rod two 52. The hinged rod one 51 is hinged with the cover plate 4, so that the connection between the cover plate 4 and the support frame 1 is realized, and the loss of the cover plate 4 is avoided. When the cover plate 4 needs to close the mounting port 14, the hinged rod one 51 and the hinged rod two 52 will be staggered and folded into the inside of the mounting port 14 during the movement and contact between the cover plate 4 and the bottom surface of the support plate 12, as shown in Figure 3 The hinged rod one 51 and the hinged rod two 52 are overlapped, which avoids the problem that the cover plate 4 cannot accurately cover the mounting port 14 due to the arrangement of the connecting mechanism 5;

[0071] When the display plate needs to be replaced, the connection between the cover plate 4 and the bottom of the support plate 12 is separated, so that the mounting port 14 is in an open state. At this time, the display plate loses the limitation and can be taken out through the mounting port 14 and replaced;

[0072] In order to ensure that the display plate is more stable in the mounting space 13, an upper limiting mechanism 3 and a lower limiting mechanism are arranged;

[0073] The upper limiting mechanism 3 is a placement plate 31 arranged in the mounting space 13 and connected with the support plate 12. The upper limiting block 32 is arranged on the placement plate 31. The cooperation block 33 is arranged at the upper end of the display plate. When the display plate is inserted into the mounting space 13 through the mounting port 14, the cooperation block 33 is hung in the upper limiting space formed by the upper limiting block 32 and the placement plate 31 in the form of a hook. The upper limiting block 32 blocks the cooperation block 33, so as to avoid the falling of the display plate;

[0074] After the upper end of the display plate is limited, the cover plate 4 is covered. The cover plate 4 drives the hinged rod one 51 and the hinged rod two 52 to move in the above-mentioned manner. Finally, the top surfaces of the hinged rod one 51 and the hinged rod two 52 are parallel to the top surface of the cover plate 4. Two lower limiting blocks 7 are arranged on the hinged rod two 52, and a lower limiting space is formed between the two lower limiting blocks 7. During the covering of the cover plate 4, the hinged rod two 52 also moves. During the movement of the hinged rod two 52 following the cover plate 4, the lower end of the display plate is inserted into the inside of the lower limiting space, so as to realize the limiting of the lower end of the display plate. Thus, the whole display plate installation process is completed. When disassembling and replacing, the lower end of the display plate is separated from the lower limiting space after the lower end of the display plate is separated from the lower limiting space after the cover plate 4 is opened, and the cooperation block 33 is lifted to make the cooperation block 33 lose the block of the upper limiting block 32.

[0075] Embodiment two

[0076] The embodiment further comprises the following structure on the basis of embodiment one: the self-locking mechanism 6 is a threaded hole one opened at the bottom of the support plate 12 and a threaded hole two opened on the cover plate 4 and penetrating through itself;

[0077] When the cover plate 4 covers the mounting port 14, the threaded hole one and the threaded hole two are coaxially arranged, and the threaded hole one and the threaded hole two are suitable for being penetrated by a bolt to connect the support plate 12 and the cover plate 4. The threaded hole one and the threaded hole two are not shown in the figure.

[0078] As shown in the figure, Figure 6 The self-locking mechanism 6 comprises a clamping block 65, a contraction block 63 and a contraction mechanism.

[0079] The clamping block 65 is connected with the cover plate 4, the contraction block 63 and the contraction mechanism are arranged in the support plate 12, and the contraction mechanism is connected with the contraction block 63 to drive the contraction block 63 to slide in the support plate 12.

[0080] The contraction block 63 is provided with a clamping groove, and the clamping block 65 is inserted into the clamping groove when the cover plate 4 closes the mounting port 14.

[0081] As shown in the figure, Figure 6 The support plate 12 is provided with a moving cavity 62 and a cavity 61, the moving cavity 62 is connected with the cavity 61, and the cavity 61 is connected with the outside space of the support plate 12.

[0082] The contraction block 63 and the contraction mechanism are arranged in the moving cavity 62, and the cavity 61 is suitable for providing a space for the clamping block 65 to move.

[0083] As shown in the figure, Figure 6 The contraction mechanism comprises a telescopic rod 69 and a spring 610, the telescopic rod 69 is located in the moving cavity 62, one end of the telescopic rod 69 is connected with the contraction block 63, the other end of the telescopic rod 69 extends to the outside of the support plate 12, and the telescopic rod 69 is suitable for sliding in the support plate 12.

[0084] The spring 610 is sleeved outside the telescopic rod 69, one end of the spring 610 is connected with the contraction block 63, and the other end of the spring 610 is connected with the inner wall of the moving cavity 62.

[0085] The moving cavity 62 is connected with a sliding rail 64, and the bottom of the contraction block 63 is provided with a sliding block which is slidingly connected with the sliding rail 64.

[0086] The upper end of the clamping block 65 is provided with a first inclined surface 66, and the lower end of the contraction block 63 is provided with a second inclined surface 67.

[0087] As shown in the figure, Figure 6 The cover plate 4 is provided with an extension plate 68, the extension plate 68 is provided with a sealing gasket, and the sealing gasket on the extension plate 68 is in contact with the inner wall of the cavity 61 when the cover plate 4 closes the mounting port 14.

[0088] The working principle of the embodiment is as follows:

[0089] The cover plate 4 is self-limited by the self-locking mechanism 6 in the state of closing the mounting port 14, so as to ensure the stable connection of the cover plate 4 and the support frame 1.

[0090] In the embodiment, in the process that the cover plate 4 moves to the bottom of the support plate 12, the clamping block 65 on the cover plate 4 enters the cavity 61, and the second inclined surface 67 on the clamping block 65 extrudes the first inclined surface 66 on the contraction block 63 with the movement of the cover plate 4. After being extruded, the contraction block 63 drives the telescopic rod 69 connected thereto to move, and extrudes the spring 610, so as to realize the movement of the entire contraction block 63 away from the clamping block 65. When the contraction block 63 moves, the sliding block at the bottom of the contraction block 63 moves in the sliding rail 64. The clamping block 65 continuously extrudes the contraction block 63. When the cover plate 4 is completely attached to the bottom of the support plate 12, the position of the clamping block 65 originally continuously followed by the movement also comes to the clamping groove in the contraction block 63. The size of the clamping groove is larger than that of the clamping block 65. When the clamping block 65 is located in the clamping groove, the clamping block 65 loses the contact surface with the contraction block 63, so that the extrusion of the clamping block 65 on the contraction block 63 is eliminated. At this time, the contraction block 63 is reset by the spring 610. After resetting, the clamping block 65 extends into the inside of the clamping groove, and the contraction block 63 limits the clamping block 65, so that the clamping block 65 cannot move, thereby playing a limiting and self-locking effect on the cover plate 4.

[0091] When the cover plate 4 needs to be opened, the telescopic rod 69 extending to the outside of the support plate 12 is only needed to be pulled to drive the contraction block 63 to move, so that the contraction block 63 releases the limiting of the clamping block 65.

[0092] In addition, an extension plate 68 can be arranged on the clamping block 65, and a sealing gasket is arranged on the extension plate 68. When the cover plate 4 covers the mounting port 14, the sealing gasket is in contact with the inner wall of the cavity 61, so as to realize the sealing effect of part of the cavity 61, and avoid the influence of the butt joint of the clamping block 65 and the contraction block 63 from the outside.

[0093] In another embodiment, the bottom of the cover plate 4 and the support plate 12 can be directly fixed by opening a threaded hole and penetrating a bolt, but this method is not convenient for installation and disassembly due to problems such as rusting of the bolt and lack of tools.

[0094] The above-described specific embodiments further specifically describe the technical problems, technical solutions and beneficial effects solved by the present application, and it should be understood that the above-described specific embodiments are merely specific embodiments of the present application and are not used to limit the present application, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A replaceable shop sign display device for old urban streets, characterized in that: The utility model relates to a kind of display frame, including: Support frame (1), the support frame (1) includes transparent plate (11) and support plate (12) connected with the transparent plate (11), the support plate (12) is connected with wall body (8); Mounting space (13) is formed between the support plate (12) and the transparent plate (11), the bottom of the support plate (12) is provided with mounting port (14) through itself, the mounting port (14) is communicated with the mounting space (13); Display panel (2), the display panel (2) is placed in the mounting space (13), the mounting space (13) is provided with limiting assembly, the limiting assembly is suitable for being connected with the display panel (2) to be suitable for fixing the display panel (2); Closure assembly, the closure assembly is located at the mounting port (14), the closure assembly includes connecting mechanism (5) and cover plate (4), the connecting mechanism (5) is suitable for being connected with the cover plate (4) and the inner wall of the mounting port (14) respectively, the cover plate (4) is suitable for being acted to drive the connecting mechanism (5) active, to cover or open the passage of the mounting port (14) and outside world; Self-locking mechanism (6), the self-locking mechanism (6) is suitable for limiting the cover plate (4) when the mounting port (14) is closed by the cover plate (4).

2. The replaceable store front display device for urban old streets according to claim 1, characterized in that, The connecting mechanism (5) includes hinged rod one (51), hinged rod two (52) and fixed seat (53); The fixed seat (53) is provided at the mounting port (14), the fixed seat (53) is hingedly connected with one end of the hinged rod two (52), the other end of the hinged rod two (52) is provided with fixed shaft on one side, one end of the hinged rod one (51) is movably sleeved on the fixed shaft, the other end of the hinged rod one (51) is hingedly connected with the cover plate (4).

3. The replaceable store front display device for urban old streets according to claim 2, characterized in that, The limiting assembly includes upper limiting mechanism (3) and lower limiting mechanism; The upper limiting mechanism (3) is suitable for being in contact with the upper end of the display panel (2) and limiting; The lower limiting mechanism is suitable for being in contact with the lower end of the display panel (2) and limiting.

4. The replaceable store front display device for urban old streets according to claim 3, characterized in that, The upper limiting mechanism (3) includes placement plate (31), upper limiting block (32) and cooperation block (33); The placement plate (31) is located in the mounting space (13), and is connected with the support plate (12), the upper limiting block (32) is connected on the top of the side, away from the support plate (12), of the placement plate (31), and the upper limiting block (32) forms an upper limiting space with the support plate (12); The cooperation block (33) is connected with the display panel (2), and the cooperation block (33) is located in the upper limiting space and in contact with the upper limiting block (32).

5. The replaceable store sign display device for old urban streets according to claim 3 or 4, characterized in that, The lower limiting mechanism is two lower limiting blocks (7), and both of the lower limiting blocks (7) are connected on the hinged rod two (52); Two lower limiting spaces are formed between the two lower limiting blocks (7), and the bottom of the display panel (2) is inserted into the lower limiting space when the mounting port (14) is in a closed state.

6. The replaceable store front display device for urban old streets according to claim 1, characterized in that, The self-locking mechanism (6) is a threaded hole one opened in the bottom of the support plate (12) and a threaded hole two opened in the cover plate (4) and penetrating through itself; When the cover plate (4) covers the mounting port (14), the threaded hole one and the threaded hole two are coaxially arranged, and the threaded hole one and the threaded hole two are adapted to be penetrated by a bolt to connect the support plate (12) and the cover plate (4).

7. The replaceable store front display device for urban old streets according to claim 1, characterized in that, The self-locking mechanism (6) comprises a clamping block (65), a contraction block (63) and a contraction mechanism; The clamping block (65) is connected with the cover plate (4), and the contraction block (63) and the contraction mechanism are arranged in the support plate (12), and the contraction mechanism is connected with the contraction block (63) to drive the contraction block (63) to slide in the support plate (12); A clamping groove is opened in the contraction block (63), and the clamping block (65) is inserted into the clamping groove when the cover plate (4) closes the mounting port (14).

8. The replaceable store front display device for urban old streets according to claim 7, characterized in that, A moving cavity (62) and a cavity (61) are opened in the support plate (12), the moving cavity (62) is connected with the cavity (61), and the cavity (61) is connected with the outside space of the support plate (12); The contraction block (63) and the contraction mechanism are arranged in the moving cavity (62), and the cavity (61) is adapted to provide a space for the movement of the clamping block (65).

9. The replaceable store front display device for urban old streets according to claim 8, characterized in that, The contraction mechanism comprises a telescopic rod (69) and a spring (610), the telescopic rod (69) is located in the moving cavity (62), one end of the telescopic rod (69) is connected with the contraction block (63), the other end of the telescopic rod (69) extends to the outside of the support plate (12), and the telescopic rod (69) is adapted to slide in the support plate (12); The spring (610) is sleeved outside the telescopic rod (69), one end of the spring (610) is connected with the contraction block (63), and the other end of the spring (610) is connected with the inner wall of the moving cavity (62); A sliding rail (64) is connected in the moving cavity (62), a sliding block is arranged at the bottom of the contraction block (63), and the sliding block is slidably connected with the sliding rail (64); A first inclined surface (66) is arranged at the upper end of the clamping block (65), and a second inclined surface (67) is arranged at the lower end of the contraction block (63).

10. The replaceable store sign display device for old urban streets according to claim 8 or 9, characterized in that, An extension plate (68) is arranged on the cover plate (4), a sealing gasket is arranged on the extension plate (68), and the sealing gasket on the extension plate (68) is adapted to be in contact with the inner wall of the cavity (61) when the cover plate (4) closes the mounting port (14).

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