Vehicle-mounted display screen with flexible fixing structure

Abstract

The invention relates to a vehicle-mounted display screen with a flexible fixing structure, which belongs to the technical field of vehicle-mounted equipment and comprises a fixing front frame, a middle-layer fixing frame arranged on the side surface of the fixing front frame, a middle-layer inner frame arranged in the middle-layer fixing frame, a display screen nested in the middle-layer inner frame and a back plate arranged on the side surface of the middle-layer fixing frame, a fixing assembly is arranged on the outer side of the middle-layer fixing frame, and a locking assembly is arranged in the middle-layer fixing frame; the fixing assembly comprises a plurality of fixing blocks arranged on the side face of the fixing front frame. According to the vehicle-mounted display screen with the flexible fixing structure, a fixing block is embedded into a sliding groove opening by pressing a fixing front frame, after the fixing block enters the sliding groove opening, a fixing spring pushes a fixing arc block to enter the fixing groove opening, and meanwhile a fixing push block extrudes a fixing base to move upwards in a slope groove opening; and the fixed seat moves upwards to further extrude the fixed spring to contract, so that the fixed arc block can be stably embedded in the fixed notch.

Description

Technical Field

[0001] The present invention relates to the technical field of vehicle-mounted equipment, and in particular to a vehicle-mounted display screen with a flexible fixing structure. Background Art

[0002] The car display is installed on the car, using a dedicated power supply, control card, unit board to display text, pictures, animations, and videos through the dot matrix. It is an independent LED car display system that has emerged with the rapid development of LED display screens. Compared with ordinary door head screens and fixed LED display screens, it has higher requirements for stability, anti-interference, anti-vibration, and dustproof. It is usually an LCD screen with external sound, SD card reading, USB, Bluetooth and other functions.

[0003] The vehicle-mounted display screen is a commonly used electronic device in automobiles. The Chinese invention patent with publication number CN106114396B discloses a flexible fixing structure for a vehicle-mounted display screen, including an upper shell, a display screen, a diffusion plate and a bottom shell. The display screen and the diffusion plate are placed in the bottom shell. The upper shell covers the bottom shell and fixes the display screen and the diffusion plate. A buffer pad is pasted on the upper shell. The upper shell is also provided with a Y-direction elastic wall, an X-direction elastic wall and a positioning column hole. The buffer pad is used to press the display screen so that it is flexibly fixed in the Z direction. The vehicle-mounted display screen flexible fixing structure provided by the invention has the advantages of reasonable structural design, simple assembly, and effective protection of the vehicle-mounted display screen. The mechanism design has higher assembly accuracy, so it is very convenient to assemble, which not only effectively extends the service life of the display screen, but also brings a more comfortable use experience to the user.

[0004] However, the main fixing structure of the invention is fixed only by setting a few buckles, which is too simple. Although the buffer pad can reduce the risk of damage to the display screen due to squeezing during the assembly process to a certain extent, it is not convenient for later disassembly and maintenance. The buckles are very likely to break after repeated use, which increases the risk of damage during later maintenance and cannot meet production needs. Therefore, a vehicle-mounted display screen with a flexible fixing structure is proposed to solve the above problems. Summary of the invention

[0005] In view of the shortcomings of the prior art, the present invention provides a vehicle-mounted display screen with a flexible fixed structure, which has the advantages of good stability and easy disassembly and maintenance, and solves the problem that the vehicle-mounted display screen with a flexible fixed structure has low flexibility and is not easy to disassemble and maintain.

[0006] To achieve the above-mentioned object, the present invention provides the following technical solutions: a vehicle-mounted display screen with a flexible fixed structure, comprising a fixed front frame, a middle-layer fixed frame arranged on the side of the fixed front frame, a middle-layer inner frame arranged inside the middle-layer fixed frame, a display screen nested inside the middle-layer inner frame, and a back plate arranged on the side of the middle-layer fixed frame, wherein a fixing component is arranged on the outside of the middle-layer fixed frame, and a locking component is arranged inside the middle-layer fixed frame;

[0007] The fixing assembly includes a plurality of fixing blocks arranged on the side of the fixing front frame, a fixing push block fixedly installed on the side of the fixing front frame, a sliding notch opened on the top of the middle-layer fixing frame, a fixing seat movably connected inside the sliding notch, a fixing spring fixedly installed on the top of the fixing seat, a fixing arc block fixedly installed on the top of the fixing spring, and an inclined notch opened on the top of the middle-layer inner frame;

[0008] The locking assembly includes a plurality of latch rods arranged to fix the side of the front frame, a plurality of latch holes opened on the side of the middle fixed frame, a plurality of locking slots opened on the side of the middle fixed frame, a plurality of locking rods slidably connected to the inside of the locking slots, a plurality of unlocking rods slidably connected to the inside of the locking slots, and a plurality of locking blocks fixedly installed on the side of the back plate.

[0009] Furthermore, the fixed front frame, middle fixed frame and middle inner frame are all square frame structures, the fixed front frame outer frame width is larger than the middle fixed frame, the inner side wall of the middle inner frame is provided with an embedding groove for fixing the display screen, and a rubber pad is arranged inside the embedding groove.

[0010] Furthermore, the inner wall of the middle inner frame is provided with a cross plate for supporting the back of the display screen, the surface of the cross plate close to the display screen is provided with a supporting rubber pad, and the surface of the back plate close to the middle inner frame is provided with a buffer pad used in conjunction with the cross plate.

[0011] Furthermore, a fixed slot is provided on the opposite side of the fixed block, the top of the fixed arc block is embedded in the fixed slot and is slidably connected to the inner wall of the fixed slot, the fixed block is embedded in the sliding slot and is slidably connected to the inner wall of the sliding slot, and the side of the fixed block is against the side of the fixed arc block.

[0012] Furthermore, the fixed push block is embedded in the inside of the inclined groove and the side surface is against the side surface of the fixed seat. A chamfer is provided on one side of the bottom of the fixed seat to cooperate with the inclined groove. The bottom of the fixed seat and the inner side wall of the inclined groove are slidably connected.

[0013] Furthermore, a plurality of limiting sliding rods are arranged on the top of the fixed arc block, a plurality of limiting holes are opened on the top of the fixed seat, and the bottoms of the limiting sliding rods are embedded in the limiting holes and are slidably connected with the fixed seat.

[0014] Furthermore, a locking through hole is provided on the side of the latch rod for use with the unlocking rod. The latch rod is embedded in the latch hole and is slidably connected to the inner wall of the latch hole. The locking slot passes through the upper and lower side walls of the frame of the middle fixed frame and is connected to the sliding slot.

[0015] Furthermore, a wedge-shaped push block is provided at one end of the locking rod close to the sliding slot, and chamfers are provided at the bottom of the fixed block and the top of the wedge-shaped push block for matching use. A locking slot connected to the locking slot is provided on the side of the middle fixed frame, and the locking block is embedded in the locking slot to the inside of the locking slot.

[0016] Furthermore, V-shaped locking wedge openings are provided on both sides of the locking block, and locking wedge blocks used in conjunction with the locking wedge openings are provided at opposite ends of the locking rod and the unlocking rod, and the two locking wedge blocks are respectively embedded in the locking wedge openings on both sides of the locking block.

[0017] Compared with the prior art, the present invention provides a vehicle-mounted display screen with a flexible fixing structure, which has the following beneficial effects:

[0018] 1. The vehicle-mounted display screen with a flexible fixed structure embeds the fixed block into the interior of the sliding groove by pressing the fixed front frame. After the fixed block enters the interior of the sliding groove, the fixed spring pushes the fixed arc block into the interior of the fixed groove. At the same time, the fixed push block squeezes the fixed seat to move upward in the inclined groove. The upward movement of the fixed seat further squeezes the fixed spring to contract, so that the fixed arc block can be stably embedded in the interior of the fixed groove to form a preliminary fixation.

[0019] 2. The vehicle-mounted display screen with a flexible fixed structure, by inserting the fixed block into the sliding slot and embedding the locking block of the back plate into the inside of the positioning slot, the fixed block will squeeze the locking rod to move laterally, so that the locking wedge block on the side of the locking rod is embedded in the locking wedge opening on the side of the locking block. After the latch rod is fully inserted into the latch hole, one end of the unlocking rod is embedded in the locking through hole, and the other end squeezes the locking wedge block and embeds it into the locking wedge opening, thereby locking the locking block, thereby locking the fixed front frame and the back plate to the two sides of the middle fixed frame respectively, forming a covering on both sides of the display screen, thereby forming a flexible fixed structure for the vehicle-mounted display screen, solving the problem that the vehicle-mounted display screen with a flexible fixed structure has low flexibility and is not convenient for disassembly and maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 A three-dimensional diagram of a vehicle-mounted display screen with a flexible fixing structure according to the present invention;

[0021] Figure 2 A three-dimensional diagram of a fixed front frame of a vehicle-mounted display screen with a flexible fixing structure according to the present invention;

[0022] Figure 3A three-dimensional diagram of a middle-layer fixing frame of a vehicle-mounted display screen with a flexible fixing structure according to the present invention;

[0023] Figure 4 This is a back view of a middle-layer fixing frame of a vehicle-mounted display screen with a flexible fixing structure according to the present invention;

[0024] Figure 5 A three-dimensional diagram of a middle inner frame of a vehicle-mounted display screen with a flexible fixing structure according to the present invention;

[0025] Figure 6 This is a three-dimensional diagram of a back plate, a locking rod, and an unlocking rod of a vehicle-mounted display screen with a flexible fixing structure according to the present invention;

[0026] Figure 7 A longitudinal section of a vehicle-mounted display screen with a flexible fixing structure according to the present invention;

[0027] Figure 8 The present invention is a vehicle-mounted display screen with a flexible fixed structure Figure 7 A magnified view of the structure in the middle;

[0028] Fig. 9 It is a cross-sectional view of a vehicle-mounted display screen with a flexible fixing structure according to the present invention;

[0029] Fig.10 The present invention is a vehicle-mounted display screen with a flexible fixed structure Fig. 9 Middle B is an enlarged view of the structure;

[0030] Fig.11 This is a three-dimensional diagram of a fixing seat, a fixing spring, and a limiting sliding rod of a vehicle-mounted display screen with a flexible fixing structure of the present invention;

[0031] Fig.12 The present invention is a vehicle-mounted display screen with a flexible fixed structure Figure 6 Enlarged view of the structure in C.

[0032] In the figure: 1. Fixed front frame; 2. Middle fixed frame; 3. Middle inner frame; 31. Embedded slot; 32. Cross plate; 4. Display screen; 5. Back plate; 51. Buffer pad; 6. Fixed assembly; 61. Fixed block; 62. Fixed push block; 63. Sliding slot; 64. Fixed seat; 65. Fixed spring; 66. Fixed arc block; 67. Bevel slot; 68. Fixed slot; 69. Limiting slide bar; 7. Locking assembly; 71. Latch rod; 72. Latch hole; 73. Locking slot; 74. Locking rod; 75. Unlocking rod; 76. Locking block; 77. Locking through hole; 78. Positioning slot; 79. Locking wedge. DETAILED DESCRIPTION

[0033] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0034] See also Figure 1-12 In this embodiment, a vehicle-mounted display screen with a flexible fixed structure includes a fixed front frame 1, a middle-layer fixed frame 2 arranged on the side of the fixed front frame 1, a middle-layer inner frame 3 arranged inside the middle-layer fixed frame 2, a display screen 4 nested inside the middle-layer inner frame 3, and a back panel 5 arranged on the side of the middle-layer fixed frame 2. A fixing component 6 is arranged on the outer side of the middle-layer fixed frame 2, and a locking component 7 is arranged inside the middle-layer fixed frame 2.

[0035] The fixed front frame 1, the middle fixed frame 2 and the middle inner frame 3 are all square frame structures. The outer frame width of the fixed front frame 1 is larger than that of the middle fixed frame 2. The inner wall of the middle inner frame 3 is provided with an embedding groove 31 for fixing the display screen 4, and a rubber pad is arranged inside the embedding groove 31.

[0036] By setting up a fixed front frame 1, a middle fixed frame 2 and a middle inner frame 3 of a square frame structure for cooperation, the fixed front frame 1 and the back panel 5 wrap the middle fixed frame 2 and the middle inner frame 3, and the middle inner frame 3 wraps the display screen 4, thereby forming a stable and comprehensive covering for the display screen 4 to form a protective structure, and the embedded groove 31 stably limits the four sides of the display screen 4 to achieve comprehensive wrapping.

[0037] The inner wall of the middle inner frame 3 is provided with a cross plate 32 for supporting the back of the display screen 4, and the surface of the cross plate 32 close to the display screen 4 is provided with a supporting rubber pad, and the surface of the back plate 5 close to the middle inner frame 3 is provided with a buffer pad 51 used in conjunction with the cross plate 32.

[0038] A cross plate 32 is arranged on the side of the middle inner frame 3, and a supporting rubber pad is arranged on the surface of the cross plate 32 to form a stable support for the back of the display screen 4, thereby enhancing the stability of the back of the display screen 4. At the same time, a buffer pad 51 is arranged on the side of the back plate 5 to fill the empty position in the middle of the cross plate 32, thereby providing additional support for the back of the display screen 4 and improving the overall anti-fall effect of the structure.

[0039] In this embodiment, the fixing assembly 6 includes a plurality of fixing blocks 61 arranged on the side of the fixed front frame 1, a fixed push block 62 fixedly installed on the side of the fixed front frame 1, a sliding groove 63 opened at the top of the middle fixed frame 2, a fixing seat 64 movably connected inside the sliding groove 63, a fixing spring 65 fixedly installed on the top of the fixing seat 64, a fixed arc block 66 fixedly installed on the top of the fixing spring 65, and a bevel groove 67 opened at the top of the middle inner frame 3.

[0040] A fixing slot 68 is provided on the opposite side of the fixing block 61, the top of the fixing arc block 66 is embedded in the fixing slot 68 and is slidably connected to the inner wall of the fixing slot 68, the fixing block 61 is embedded in the sliding slot 63 and is slidably connected to the inner wall of the sliding slot 63, and the side of the fixing block 61 is against the side of the fixing arc block 66.

[0041] By setting a fixing notch 68 on the surface of the fixing block 61 for use with the fixing arc block 66 , the fixing arc block 66 can be embedded in the fixing notch 68 under the support of the fixing spring 65 , thereby clamping the fixing block 61 in the sliding notch 63 .

[0042] The fixed push block 62 is embedded in the inclined groove 67 and the side surface is against the side surface of the fixed seat 64. The bottom side of the fixed seat 64 is provided with a chamfer to match the inclined groove 67. The bottom of the fixed seat 64 and the inner side wall of the inclined groove 67 are slidably connected.

[0043] By setting the fixed push block 62 against the side of the fixed seat 64 , after the fixed push block 62 is inserted into the inclined slot 67 , it will push the fixed seat 64 to move upward on the inclined surface of the inclined slot 67 , so that the fixed block 61 is inserted into the interior of the fixed slot 68 .

[0044] A plurality of limiting slide bars 69 are disposed on the top of the fixed arc block 66 , a plurality of limiting holes are opened on the top of the fixed seat 64 , and the bottoms of the limiting slide bars 69 are embedded in the limiting holes and are slidably connected to the fixed seat 64 .

[0045] By arranging a limit slide bar 69 at the bottom of the fixed arc block 66 to cooperate with the fixing spring 65, the relative movement between the fixing seat 64 and the fixed arc block 66 is always maintained in one direction.

[0046] In this embodiment, the locking assembly 7 includes a plurality of latch rods 71 ​​arranged to fix the side of the front frame 1, a plurality of latch holes 72 opened on the side of the middle fixed frame 2, a plurality of locking slot holes 73 opened on the side of the middle fixed frame 2, a plurality of locking rods 74 slidably connected to the locking slot holes 73, a plurality of unlocking rods 75 slidably connected to the locking slot holes 73, and a plurality of locking blocks 76 fixedly installed on the side of the back panel 5.

[0047] A locking through hole 77 is provided on the side of the latch rod 71 for cooperating with the unlocking rod 75. The latch rod 71 is embedded in the interior of the latch hole 72 and is slidably connected to the inner wall of the latch hole 72. The locking slot 73 passes through the upper and lower side walls of the frame of the middle fixed frame 2 and is connected to the sliding slot 63.

[0048] By setting a locking through hole 77 on the side of the latch rod 71, after the latch rod 71 is inserted into the locking through hole 77, the unlocking rod 75 can be inserted into the inside of the locking through hole 77, thereby locking the latch rod 71 inside the latch hole 72.

[0049] A wedge-shaped push block is provided at one end of the locking rod 74 close to the sliding slot 63, and the bottom of the fixed block 61 and the top of the wedge-shaped push block are provided with chamfers for matching use. A locking slot 78 connected to the locking slot 73 is provided on the side of the middle fixed frame 2, and the locking block 76 is embedded in the locking slot 78 to the inside of the locking slot 73.

[0050] By setting a wedge-shaped push block on the side of the locking rod 74, the fixed block 61 can push the wedge-shaped push block on the side of the locking rod 74 after being embedded in the sliding slot 63, thereby pushing the locking rod 74 to move inside the locking slot 73 to achieve a locking effect.

[0051] V-shaped locking wedges are provided on both sides of the locking block 76, and locking wedges 79 are provided on the opposite ends of the locking rod 74 and the unlocking rod 75 for use with the locking wedges. The two locking wedges 79 are respectively embedded in the locking wedges on both sides of the locking block 76.

[0052] By setting a locking wedge on the side of the locking block 76, the locking block 76 can be locked and fixed inside the locking groove 78 after the locking wedge 79 is inserted into the locking wedge. At the same time, the locking wedge 79 keeps one end of the unlocking rod 75 locked inside the latch rod 71.

[0053] It should be noted that the unlocking rod 75 is a rod made of a flexible material that can be deformed in length to a certain extent, and the locking rod 74 is a rod made of a hard material that will not undergo obvious length deformation.

[0054] The working principle of the above embodiment is:

[0055] The fixed block 61 is embedded into the sliding groove 63 by pressing the fixed front frame 1. After the fixed block 61 enters the sliding groove 63, the fixed spring 65 pushes the fixed arc block 66 into the fixed groove 68. At the same time, the fixed push block 62 squeezes the fixed seat 64 to move upward in the inclined groove 67. The upward movement of the fixed seat 64 further squeezes the fixed spring 65 to contract, so that the fixed arc block 66 can be stably embedded in the fixed groove 68 to form a preliminary fixation.

[0056] When the locking cam 78 is in the unlocking state, the locking block 76 is locked, and the locking cam 78 is locked.

[0057] The installation method, connection method or setting method disclosed in this embodiment are all common mechanical connection methods, and they can be implemented as long as they can achieve their beneficial effects. In addition, the electrical components appearing in this embodiment are all electrically connected to the main controller and the power supply. The main controller can be a conventional known device such as a computer that plays a control role. Technicians in this field can control the electrical components through simple programming, and the existing disclosed power connection technology is also common knowledge in this field, so the control method and circuit connection are no longer explained in detail in this embodiment.

[0058] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0059] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A vehicle-mounted display screen with a flexible fixed structure, comprising a fixed front frame (1), a middle-layer fixed frame (2) arranged on the side of the fixed front frame (1), a middle-layer inner frame (3) arranged inside the middle-layer fixed frame (2), a display screen (4) nested inside the middle-layer inner frame (3), and a back plate (5) arranged on the side of the middle-layer fixed frame (2), characterized in that: A fixing component (6) is arranged on the outside of the middle-layer fixing frame (2), and a locking component (7) is arranged on the inside of the middle-layer fixing frame (2); The fixing assembly (6) comprises a plurality of fixing blocks (61) arranged on the side of the fixing front frame (1), a fixing push block (62) fixedly mounted on the side of the fixing front frame (1), a sliding notch (63) opened on the top of the middle-layer fixing frame (2), a fixing seat (64) movably connected inside the sliding notch (63), a fixing spring (65) fixedly mounted on the top of the fixing seat (64), a fixing arc block (66) fixedly mounted on the top of the fixing spring (65), and an inclined notch (67) opened on the top of the middle-layer inner frame (3); The locking assembly (7) comprises a plurality of latch rods (71) arranged to fix the side of the front frame (1), a plurality of latch holes (72) provided on the side of the middle fixed frame (2), a plurality of locking slots (73) provided on the side of the middle fixed frame (2), a plurality of locking rods (74) slidably connected inside the locking slots (73), a plurality of unlocking rods (75) slidably connected inside the locking slots (73), and a plurality of locking blocks (76) fixedly mounted on the side of the back plate (5).

2. The vehicle-mounted display screen with a flexible fixing structure according to claim 1, characterized in that: The fixed front frame (1), the middle fixed frame (2) and the middle inner frame (3) are all square frame structures. The width of the outer frame of the fixed front frame (1) is larger than that of the middle fixed frame (2). The inner side wall of the middle inner frame (3) is provided with an embedding groove (31) for fixing the display screen (4), and a rubber pad is arranged inside the embedding groove (31).

3. The vehicle-mounted display screen with a flexible fixing structure according to claim 1, characterized in that: The inner side wall of the middle inner frame (3) is provided with a cross plate (32) for supporting the back of the display screen (4); a supporting rubber pad is provided on a side surface of the cross plate (32) close to the display screen (4); and a buffer pad (51) used in conjunction with the cross plate (32) is provided on a side surface of the back plate (5) close to the middle inner frame (3).

4. The vehicle-mounted display screen with a flexible fixing structure according to claim 1, characterized in that: A fixing slot (68) is provided on one side opposite to the fixing block (61); the top of the fixing arc block (66) is embedded in the fixing slot (68) and is slidably connected to the inner wall of the fixing slot (68); the fixing block (61) is embedded in the sliding slot (63) and is slidably connected to the inner wall of the sliding slot (63); and the side surface of the fixing block (61) abuts against the side surface of the fixing arc block (66).

5. The vehicle-mounted display screen with a flexible fixing structure according to claim 1, characterized in that: The fixed push block (62) is embedded in the inside of the inclined notch (67) and the side surface abuts against the side surface of the fixed seat (64); a chamfer matching the inclined notch (67) is provided on one side of the bottom of the fixed seat (64); the bottom of the fixed seat (64) and the inner side wall of the inclined notch (67) are slidably connected.

6. The vehicle-mounted display screen with a flexible fixing structure according to claim 1, characterized in that: A plurality of limiting sliding rods (69) are arranged on the top of the fixed arc block (66), a plurality of limiting holes are opened on the top of the fixed seat (64), and the bottom of the limiting sliding rod (69) is embedded in the limiting hole and is slidably connected with the fixed seat (64).

7. The vehicle-mounted display screen with a flexible fixing structure according to claim 1, characterized in that: The side of the latch rod (71) is provided with a locking through hole (77) used in conjunction with the unlocking rod (75); the latch rod (71) is embedded in the latch hole (72) and is slidably connected to the inner side wall of the latch hole (72); the locking slot (73) penetrates the upper and lower side walls of the frame of the middle fixed frame (2) and is connected to the sliding slot (63).

8. The vehicle-mounted display screen with a flexible fixing structure according to claim 1, characterized in that: A wedge-shaped push block is provided at one end of the locking rod (74) close to the sliding slot (63); the bottom of the fixed block (61) and the top of the wedge-shaped push block are provided with chamfers for use together; a locking slot (78) connected to the locking slot (73) is provided on the side of the middle fixed frame (2); and the locking block (76) is embedded in the locking slot (78) to the inside of the locking slot (73).

9. The vehicle-mounted display screen with a flexible fixing structure according to claim 1, characterized in that: V-shaped locking wedge openings are provided on both sides of the locking block (76), and locking wedge blocks (79) used in conjunction with the locking wedge openings are provided at opposite ends of the locking rod (74) and the unlocking rod (75), and the two locking wedge blocks (79) are respectively embedded in the locking wedge openings on both sides of the locking block (76).

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