Mini-LED backlight module

Abstract

The Mini-LED backlight module comprises base plates, side plates are arranged on the two sides of the base plates, a first conveying mechanism and a second conveying mechanism are arranged between the two base plates, the first conveying mechanism and the second conveying mechanism are connected through a synchronous linkage component, and a driving part is arranged on the side plate located in front; a fixing block is arranged on the top surface of each side plate, a turnover long rod is arranged between the two fixing blocks, a plurality of cross-shaped turnover frames are arranged on the turnover long rod, four U-shaped turnover grooves are formed in each cross-shaped turnover frame, and backlight module bodies are placed among the adjacent U-shaped turnover grooves; a synchronous gear is arranged in front of the front side plate, the synchronous gear is connected with the first conveying mechanism, and the overturning long rod is connected with the synchronous gear through an intermittent matching mechanism. Through cooperative arrangement of all the structures, the backlight module body can be turned over conveniently during machining, and automatic conveying of the backlight module body is facilitated.

Description

Technical Field

[0001] The present invention relates to the technical field related to backlight modules, and in particular to a Mini-LED backlight module. Background Art

[0002] Mini-LED has the characteristics of self-luminous display. Its advantages include full solid state, long life, high brightness, low power consumption, small size, ultra-high resolution, and can be applied to extreme environments such as high temperature or radiation. Compared with OLED technology of self-luminous display, Mini-LED is not only more efficient and has a longer life, but also its materials are not easily affected by the environment and are relatively stable. It can also avoid the phenomenon of afterimage, etc. Since the brightness, contrast, life, viewing angle and resolution of Mini-LED LCD are stronger than traditional LCD and OLED display technologies, many manufacturers regard it as the next generation of display technology;

[0003] Currently, it is inconvenient to flip and turn over the backlight mold during production and processing on the market, which reduces the production and processing efficiency of the subsequent back module. Therefore, based on the above problem, the present invention provides a Mini-LED backlight module flipping and conveying device. Summary of the invention

[0004] In view of the deficiencies in the prior art, the present invention provides a Mini-LED backlight module that solves the problems mentioned in the background technology.

[0005] To achieve the above objectives, the present invention is implemented through the following technical solutions:

[0006] A Mini-LED backlight module comprises a substrate, side panels are fixedly arranged on both sides of the substrate, a first conveying mechanism and a second conveying mechanism are installed between the two substrates, the second conveying mechanism and the first conveying mechanism are both installed on the substrate, the second conveying mechanism is located on the left side of the first conveying mechanism, and the first conveying mechanism and the second conveying mechanism are connected by a synchronous linkage component, a driving member is fixedly installed on the side panel located in the front, and the driving member is connected to the second conveying mechanism;

[0007] A fixed block is fixed on the top surface of each side plate, a long turning rod is rotatably provided between two of the fixed blocks, a plurality of cross turning frames are evenly fixed on the turning rod, and four U-shaped turning grooves are provided on each of the cross turning frames, and a backlight module body is placed between adjacent U-shaped turning grooves;

[0008] A synchronous gear is arranged in front of the side plate located in the front, and the synchronous gear is connected to the first conveying mechanism. The front end of the flip rod extends through the outside of the fixed block located in the front and is connected to the synchronous gear through an intermittent matching mechanism.

[0009] Further, the first conveying mechanism includes a first conveying shaft and a plurality of first U-shaped frames, the first conveying shaft is rotatably arranged between the two side plates, a first active roller is fixedly sleeved on the first conveying shaft, a front end of the first conveying shaft extends through the outer side of the side plate located in the front and is fixedly connected to the synchronous gear, each of the first U-shaped frames is fixedly arranged on the base plate, and a first rotating shaft is rotatably arranged between each of the first U-shaped frames, a first driving wheel is fixedly sleeved on each of the first rotating shafts, a first conveying belt is arranged between each of the first driving wheels and the first active roller, and is connected through the first conveying belt transmission;

[0010] The second conveying mechanism includes a second conveying shaft and a plurality of second U-shaped frames. The second conveying shaft is rotatably arranged between the two side plates. A second active roller is fixedly sleeved on the second conveying shaft. The front end of the second conveying shaft is connected to the driving member. The rear end of the second conveying shaft is connected to the rear end of the first conveying shaft through a synchronous linkage component. Each of the second U-shaped frames is fixed on the base plate, and a second rotating shaft is rotatably arranged between each of the second U-shaped frames. A second driving wheel is fixedly sleeved on each of the second rotating shafts. A second conveying belt is arranged between each of the second driving wheels and the second active roller and is connected through the second conveying belt transmission.

[0011] Furthermore, the driving member includes a mounting plate, the mounting plate is fixedly mounted on the side plate located in the front, a driving motor is fixedly mounted on the mounting plate, and a power output end of the driving motor is fixedly connected to the second conveying shaft.

[0012] Furthermore, the synchronous linkage component includes two synchronous wheels, and the two synchronous wheels are respectively fixed to the rear ends of the first conveying shaft and the second conveying shaft. A synchronous belt is arranged between the two synchronous wheels and the two synchronous wheels are connected through synchronous belt transmission.

[0013] Furthermore, the intermittent matching mechanism includes an intermittent member and two synchronous shafts, the intermittent member is fixedly connected to the front end of the flip long rod, the two synchronous shafts are rotatably connected to the side plate located in the front, each of the synchronous shafts is fixedly sleeved with a synchronous transmission wheel, and a synchronous transmission belt is provided between the two synchronous transmission wheels and is connected through the synchronous transmission belt;

[0014] An intermittent fitting piece is fixedly provided at the front end of one of the synchronous shafts, and the intermittent fitting piece matches with the intermittent piece. A matching gear is fixedly provided at the front end of the other synchronous shaft, and the matching gear is meshedly connected with the synchronous gear.

[0015] Furthermore, the intermittent mating part includes an intermittent shaft, which is rotatably connected to the side plate located in the front, a turntable is fixedly provided at the front end of the intermittent shaft, a notch disk is fixedly provided at the front side of the turntable, an extension block is fixedly provided on the outer wall of the turntable, an intermittent pin is fixedly provided on the extension block, a plurality of intermittent grooves are evenly provided on the intermittent part, the intermittent pin cooperates with the plurality of intermittent grooves, an arc groove is provided between two adjacent intermittent grooves, and each of the arc grooves cooperates with the outer wall of the notch disk.

[0016] The present invention provides a Mini-LED backlight module. Compared with the prior art, it has the following beneficial effects:

[0017] 1. The present invention facilitates the automatic conveyance of the backlight module body when the backlight module body needs to be processed and produced through the coordinated arrangement of the first conveying mechanism, the second conveying mechanism, the synchronous linkage member and the driving member, thereby facilitating the subsequent processing and manufacturing thereof, and at the same time improving the subsequent processing efficiency;

[0018] 2. The present invention not only facilitates the flipping operation of the backlight module body through the intermittent matching mechanism, the intermittent matching parts and the matching arrangement of a plurality of cross flip frames, but also is simple to operate, saves time and effort, and is conducive to improving the efficiency of later processing. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0020] Figure 1 The main view of the three-dimensional connection diagram of the overall structure of the present invention is shown;

[0021] Figure 2 A three-dimensional rear view connection diagram of the overall structure of the present invention is shown;

[0022] Figure 3 It shows a three-dimensional connection schematic diagram of the main view half-section structure of the present invention;

[0023] Figure 4 A schematic diagram of a three-dimensional split structure of the overall structure of the present invention is shown;

[0024] Figure 5 A bottom-up three-dimensional connection diagram of the first conveying mechanism, the second conveying mechanism and the intermittent matching mechanism of the present invention is shown;

[0025] Figure 6A schematic diagram of the three-dimensional connection between the intermittent matching mechanism of the present invention and the cross flip frame and other structures is shown;

[0026] Figure 7 A schematic diagram of the three-dimensional split structure of the intermittent matching mechanism of the present invention is shown;

[0027] Figure 8 The present invention is shown Figure 1 A schematic diagram of the enlarged structure at point A;

[0028] As shown in the figure: 1, side plate; 2, driving motor; 3, mounting plate; 4, first conveying mechanism; 41, first driving wheel; 42, first conveying belt; 43, first conveying shaft; 44, first active roller; 45, first U-shaped frame; 5, synchronous gear; 6, synchronous linkage component; 61, synchronous belt; 62, synchronous wheel; 7, fixing block; 8, cross flip frame; 9, backlight module body; 10, second conveying mechanism; 101, second driving wheel; 102, second conveying belt; 103, The second conveying shaft; 104, the second active roller; 105, the second U-shaped frame; 11, the turning long rod; 12, the intermittent matching mechanism; 121, the intermittent member; 1211, the intermittent shifting groove; 1212, the arc groove; 122, the synchronous transmission belt; 123, the synchronous transmission wheel; 124, the synchronous shaft; 125, the matching gear; 126, the turntable; 1261, the extension block; 127, the notched disk; 128, the intermittent shifting pin; 129, the intermittent shaft; 13, the base plate; 14, the U-shaped turning groove. DETAILED DESCRIPTION

[0029] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention are clearly and completely described. Obviously, the described embodiments are 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.

[0030] Embodiment 1

[0031] In order to solve the technical problems in the background technology, a Mini-LED backlight module is provided as follows:

[0032] Combination Figure 1-8As shown, a Mini-LED backlight module provided by the present invention includes a substrate 13, side panels 1 are fixedly arranged on both sides of the substrate 13, a first conveying mechanism 4 and a second conveying mechanism 10 are installed between the two substrates 13, the second conveying mechanism 10 and the first conveying mechanism 4 are both installed on the substrate 13, the second conveying mechanism 10 is located on the left side of the first conveying mechanism 4, and the first conveying mechanism 4 and the second conveying mechanism 10 are connected by a synchronous linkage member 6, and a driving member is fixedly installed on the side panel 1 located in the front, and the driving member is connected to the second conveying mechanism 10;

[0033] A fixed block 7 is fixed on the top surface of each side plate 1, and a long turning rod 11 is rotatably provided between the two fixed blocks 7. A plurality of cross turning frames 8 are evenly fixed on the turning long rod 11, and each cross turning frame 8 is provided with four U-shaped turning grooves 14, and a backlight module body 9 is placed between adjacent U-shaped turning grooves 14;

[0034] A synchronous gear 5 is arranged in front of the front side plate 1, and the synchronous gear 5 is connected to the first conveying mechanism 4. The front end of the flip rod 11 extends through the outside of the fixed block 7 in the front and is connected to the synchronous gear 5 through an intermittent matching mechanism 12.

[0035] The first conveying mechanism 4 includes a first conveying shaft 43 and a plurality of first U-shaped frames 45. The first conveying shaft 43 is rotatably disposed between the two side plates 1. A first active roller 44 is fixedly sleeved on the first conveying shaft 43. The front end of the first conveying shaft 43 extends through the outer side of the side plate 1 located in the front and is fixedly connected to the synchronous gear 5. Each first U-shaped frame 45 is fixedly disposed on the base plate 13, and a first rotating shaft is rotatably disposed between each first U-shaped frame 45. A first driving wheel 41 is fixedly sleeved on each first rotating shaft. A first conveying belt 42 is disposed between each first driving wheel 41 and the first active roller 44 and is connected through the first conveying belt 42 for transmission.

[0036] The second conveying mechanism 10 includes a second conveying shaft 103 and a plurality of second U-shaped frames 105. The second conveying shaft 103 is rotatably arranged between the two side plates 1. A second active roller 104 is fixedly sleeved on the second conveying shaft 103. The front end of the second conveying shaft 103 is connected to the driving member. The rear end of the second conveying shaft 103 is connected to the rear end of the first conveying shaft 43 through a synchronous linkage member 6. Each second U-shaped frame 105 is fixedly arranged on the base plate 13, and a second rotating shaft is rotatably arranged between each second U-shaped frame 105. A second driving wheel 101 is fixedly sleeved on each second rotating shaft. A second conveying belt 102 is arranged between each second driving wheel 101 and the second active roller 104 and is transmission-connected through the second conveying belt 102.

[0037] The driving member includes a mounting plate 3 , which is fixedly mounted on the side plate 1 located in the front. A driving motor 2 is fixedly mounted on the mounting plate 3 , and a power output end of the driving motor 2 is fixedly connected to the second conveying shaft 103 .

[0038] The synchronous linkage component 6 includes two synchronous wheels 62 , which are respectively fixed to the rear ends of the first conveying shaft 43 and the second conveying shaft 103 . A synchronous belt 61 is provided between the two synchronous wheels 62 and the two synchronous wheels are connected through the synchronous belt 61 .

[0039] In specific use, when the backlight module body 9 needs to be produced and processed, and automatically transported, refer to Figure 1 The backlight module body 9 is transported to the cross flip frame 8 through the first conveying mechanism 4. The cross flip frame 8 is driven to rotate through the intermittent matching mechanism 12 to flip the backlight module body 9 to the second conveying mechanism 10 and automatically transport it through the second conveying mechanism 10. The drive motor 2 is started. Under the power output of the drive motor 2, the second conveying shaft 103, the second active roller 104 and the corresponding synchronous wheel 62 are driven to rotate synchronously. When the second active roller 104 is driven, a plurality of second conveyor belts 102 are driven to rotate synchronously. Under the drive of the second conveyor belt 102, a plurality of second drive wheels 103 are driven to rotate synchronously. 01 rotates synchronously. When the synchronous wheel 62 on the left rotates, the synchronous belt 61 is driven to transmit synchronously. Under the transmission of the synchronous belt 61, the synchronous wheel 62 on the right rotates synchronously, and then the first conveying shaft 43, the first active roller 44, and the synchronous gear 5 rotate synchronously, thereby driving a plurality of first conveying belts 42 to rotate synchronously. In this way, it is convenient to drive a plurality of first driving wheels 41 to rotate synchronously. When the synchronous gear 5 rotates, the intermittent matching mechanism 12 is synchronously driven to rotate intermittently, and then a plurality of cross flipping frames 8 are synchronously driven to flip intermittently. See Figure 1 The present invention cooperates with the first conveying mechanism 4, the second conveying mechanism 10, the synchronous linkage component 6 and the driving member. When the backlight module body 9 needs to be processed and produced, it is convenient to automatically convey the backlight module body 9, thereby facilitating its subsequent processing and manufacturing, and at the same time helping to improve the efficiency of subsequent processing.

[0040] Embodiment 2

[0041] like Figure 1-8 As shown, based on the above embodiment, this embodiment further provides the following contents:

[0042] The intermittent matching mechanism 12 includes an intermittent member 121 and two synchronous shafts 124. The intermittent member 121 is fixedly connected to the front end of the flip long rod 11. The two synchronous shafts 124 are both rotatably connected to the side plate 1 located in the front. A synchronous transmission wheel 123 is fixedly sleeved on each synchronous shaft 124. A synchronous transmission belt 122 is arranged between the two synchronous transmission wheels 123 and is connected through the synchronous transmission belt 122.

[0043] An intermittent fitting piece is fixedly provided at the front end of one of the synchronous shafts 124 , and the intermittent fitting piece matches with the intermittent piece 121 . A matching gear 125 is fixedly provided at the front end of the other synchronous shaft 124 , and the matching gear 125 is meshedly connected with the synchronous gear 5 .

[0044] The intermittent mating parts include an intermittent shaft 129, which is rotatably connected to the side plate 1 located in the front. A turntable 126 is fixedly provided at the front end of the intermittent shaft 129, and a notched disk 127 is fixedly provided at the front of the turntable 126. An extension block 1261 is fixedly provided on the outer wall of the turntable 126, and an intermittent pin 128 is fixedly provided on the extension block 1261. A plurality of intermittent grooves 1211 are evenly provided on the intermittent part 121, and the intermittent pin 128 cooperates with the plurality of intermittent grooves 1211. An arc groove 1212 is provided between two adjacent intermittent grooves 1211, and each arc groove 1212 cooperates with the outer wall of the notched disk 127.

[0045] In specific use, based on the first embodiment, when it is necessary to further increase the practicality of the overall device, the backlight module body 9 is turned over during processing and manufacturing, and the operation is as follows:

[0046] See also Figure 1When the backlight module body 9 on the first conveying mechanism 4 needs to be turned over and flipped to the second conveying mechanism 10 through the cooperation of a plurality of cross turning frames 8 and the intermittent matching mechanism 12, and then automatically conveyed by the second conveying mechanism 10 at a later time, when the synchronous gear 5 rotates, it synchronously drives the matching gear 125 to mesh and rotate, thereby driving the synchronous shaft 124 and the synchronous transmission wheel 123 on the right side to rotate synchronously, thereby driving the synchronous transmission belt 122 to perform synchronous transmission, and under the transmission of the synchronous transmission belt 122, the synchronous shaft 124, the synchronous transmission wheel 123 and the intermittent matching parts on the left side are driven to rotate synchronously. Step rotation, because the intermittent matching member cooperates with the intermittent member 121, when the turntable 126 rotates, the notched disk 127, the extension block 1261, and the intermittent pin 128 are driven to rotate synchronously. Since a plurality of intermittent slots 1211 are evenly provided on the intermittent member 121, the intermittent pin 128 cooperates with the plurality of intermittent slots 1211, and an arc groove 1212 is provided between two adjacent intermittent slots 1211, and each arc groove 1212 cooperates with the outer wall of the notched disk 127. When the intermittent pin 128 drives the intermittent slot 1211 to rotate once, at this time, a plurality of cross flip frames 8 rotate 90 degrees, see Figure 1 and Figure 3 As shown, the backlight module body 9 to be processed is transported from right to left by the first conveying mechanism 4, and the backlight module body 9 to be processed is transported between several U-shaped flip grooves 14 to be placed. At this time, the intermittent matching mechanism 12 rotates synchronously, the intermittent pin 128 is moved once, and several cross flip frames 8 are rotated ninety degrees, the intermittent pin 128 is moved twice, and several cross flip frames 8 are rotated one hundred and eighty degrees, and the rotation in the same direction is continued reciprocatingly. At this time, the backlight module body 9 located on the first conveying mechanism 4 is turned over and transferred to the second conveying mechanism 10 through the intermittent matching mechanism 12 and the several cross flip frames 8, and the turned over backlight module body 9 is continued to be transported from right to left through the second conveying mechanism 10. In this way, through the coordination of the intermittent matching mechanism 12, the intermittent matching parts and the several cross flip frames 8 and other structures, it is not only convenient to turn over the backlight module body 9, but also simple to operate, saving time and effort, which is conducive to improving the efficiency of later processing.

[0047] 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.

[0048] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A Mini-LED backlight module, characterized in that: The invention comprises a base plate (13), both sides of which are fixedly provided with side plates (1), a first conveying mechanism (4) and a second conveying mechanism (10) are installed between the two base plates (13), the second conveying mechanism (10) and the first conveying mechanism (4) are both installed on the base plate (13), the second conveying mechanism (10) is located on the left side of the first conveying mechanism (4), and the first conveying mechanism (4) and the second conveying mechanism (10) are connected via a synchronous linkage component (6), and a driving member is fixedly installed on the side plate (1) located in the front, and the driving member is connected to the second conveying mechanism (10); A fixed block (7) is fixedly provided on the top surface of each side plate (1); a long turning rod (11) is rotatably provided between two of the fixed blocks (7); a plurality of cross turning frames (8) are evenly fixedly provided on the long turning rod (11); each of the cross turning frames (8) is provided with four U-shaped turning grooves (14); a backlight module body (9) is placed between adjacent U-shaped turning grooves (14); A synchronous gear (5) is arranged in front of the side plate (1) located in the front, and the synchronous gear (5) is connected to the first conveying mechanism (4). The front end of the flip rod (11) extends through the outside of the fixed block (7) located in the front and is connected to the synchronous gear (5) through an intermittent matching mechanism (12).

2. The Mini-LED backlight module according to claim 1, characterized in that: The first conveying mechanism (4) comprises a first conveying shaft (43) and a plurality of first U-shaped frames (45). The first conveying shaft (43) is rotatably arranged between the two side plates (1). A first active roller (44) is fixedly sleeved on the first conveying shaft (43). The front end of the first conveying shaft (43) extends through the outer side of the side plate (1) located in the front and is fixedly connected to the synchronous gear (5). Each of the first U-shaped frames (45) is fixedly arranged on the base plate (13). A first rotating shaft is rotatably arranged between each of the first U-shaped frames (45). A first driving wheel (41) is fixedly sleeved on each of the first rotating shafts. A first conveying belt (42) is arranged between each of the first driving wheels (41) and the first active roller (44) and is connected to each other through the first conveying belt (42). The second conveying mechanism (10) comprises a second conveying shaft (103) and a plurality of second U-shaped frames (105). The second conveying shaft (103) is rotatably arranged between the two side plates (1). A second active roller (104) is fixedly sleeved on the second conveying shaft (103). The front end of the second conveying shaft (103) is connected to a driving member. The rear end of the second conveying shaft (103) is connected to the rear end of the first conveying shaft (43) via a synchronous linkage member (6). Each of the second U-shaped frames (105) is fixedly arranged on the base plate (13). A second rotating shaft is rotatably arranged between each of the second U-shaped frames (105). A second driving wheel (101) is fixedly sleeved on each of the second rotating shafts. A second conveying belt (102) is arranged between each of the second driving wheels (101) and the second active roller (104) and is connected in transmission via the second conveying belt (102).

3. The Mini-LED backlight module according to claim 2, characterized in that: The driving member comprises a mounting plate (3), the mounting plate (3) being fixedly mounted on the side plate (1) located in the front, a driving motor (2) being fixedly mounted on the mounting plate (3), and a power output end of the driving motor (2) being fixedly connected to the second conveying shaft (103).

4. The Mini-LED backlight module according to claim 2, characterized in that: The synchronous linkage component (6) comprises two synchronous wheels (62), the two synchronous wheels (62) are respectively fixed to the rear ends of the first conveying shaft (43) and the second conveying shaft (103), and a synchronous belt (61) is arranged between the two synchronous wheels (62) and the two synchronous wheels are connected by transmission through the synchronous belt (61).

5. The Mini-LED backlight module according to claim 1, characterized in that: The intermittent matching mechanism (12) comprises an intermittent member (121) and two synchronous shafts (124); the intermittent member (121) is fixedly connected to the front end of the flip long rod (11); the two synchronous shafts (124) are both rotatably connected to the side plate (1) located in the front; a synchronous transmission wheel (123) is fixedly sleeved on each of the synchronous shafts (124); a synchronous transmission belt (122) is arranged between the two synchronous transmission wheels (123) and the two synchronous transmission wheels (123) are connected in transmission through the synchronous transmission belt (122); An intermittent mating piece is fixedly provided at the front end of one of the synchronous shafts (124), and the intermittent mating piece is matched with the intermittent piece (121). A matching gear (125) is fixedly provided at the front end of the other synchronous shaft (124), and the matching gear (125) is meshedly connected with the synchronous gear (5).

6. The Mini-LED backlight module according to claim 5, characterized in that: The intermittent mating part comprises an intermittent shaft (129), the intermittent shaft (129) is rotatably connected to the side plate (1) located in the front, a rotating disk (126) is fixedly provided at the front end of the intermittent shaft (129), a notched disk (127) is fixedly provided at the front face of the rotating disk (126), an extension block (1261) is fixedly provided on the outer wall of the rotating disk (126), an intermittent pin (128) is fixedly provided on the extension block (1261), a plurality of intermittent slots (1211) are evenly provided on the intermittent part (121), the intermittent pin (128) is matched with the plurality of intermittent slots (1211), an arc groove (1212) is provided between two adjacent intermittent slots (1211), and each of the arc grooves (1212) is matched with the outer wall of the notched disk (127).

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