Two-stage stirring efficient mixing system

Abstract

The invention provides a two-stage stirring efficient mixing system, which belongs to the technical field of stirring equipment, and comprises a stirring barrel, the stirring barrel is connected with a discharging pipe and a feeding pipe, the upper end of the stirring barrel is provided with a motor, and the stirring barrel is internally provided with a driving fluted disc, a rotating shaft and a primary stirring rod. The secondary stirring assembly promotes the stirring effect through rotation of a rotating shaft; and the rolling assembly utilizes the secondary stirring assembly to improve the rolling of the materials. The stirring device has the beneficial effects that flowing of materials in the stirring barrel is effectively improved through different rotating speeds of all the parts, so that two-stage stirring of the stirring device is achieved, the stirring efficiency and the material mixing speed are improved, dead corners are avoided, in addition, the rolling effect is improved through the rolling plate, and the service life of the stirring device is prolonged. And the second connecting rod and the first connecting rod can promote the stirring effect while moving up and down, so that the material mixing speed is increased, the use of external driving equipment is reduced, and resources are saved.

Description

Technical Field

[0001] The invention relates to the technical field of stirring equipment, and in particular to a two-stage stirring and efficient mixing system. Background Art

[0002] The mixing system is an important equipment used in mechanical processing and building materials processing. It has the function of mixing materials of different components to meet the production needs. The two-stage mixing technology is a mixing technology widely used in chemical, food, pharmaceutical and other industries. It improves the mixing uniformity of materials through a two-stage mixing process.

[0003] At present, single-stage stirring systems are mostly used in the use of stirring systems, while some two-stage stirring system equipment uses more driving devices, which increases energy consumption, and dead corners may be generated during the stirring process, resulting in some materials not being fully mixed, affecting the quality of the final product. How to invent a two-stage stirring and efficient mixing system to solve these problems has become an urgent problem to be solved by technical personnel in this field. Summary of the invention

[0004] In order to make up for the above shortcomings, the present invention provides a two-stage stirring and efficient mixing system, which aims to solve the problem that more driving devices are used, thereby increasing energy consumption, and dead corners may be generated during the stirring process, resulting in some materials not being fully mixed, affecting the quality of the final product.

[0005] The present invention is achieved in that:

[0006] The present invention provides a two-stage stirring and efficient mixing system, comprising a stirring barrel, the stirring barrel being connected to a discharge pipe and a feed pipe, a motor being arranged at the upper end of the stirring barrel, a driving gear disc, a rotating shaft and a main-stage stirring rod being arranged inside the stirring barrel, and further comprising:

[0007] A secondary stirring component, the secondary stirring component is located inside the stirring barrel, and the secondary stirring component utilizes the rotation of the rotating shaft to promote the stirring effect;

[0008] The tumbling assembly is located inside the mixing barrel, and the tumbling assembly utilizes a secondary mixing assembly to enhance the tumbling of the material.

[0009] Preferably, the upper end of the mixing barrel is fixedly connected to the feed pipe and the motor respectively, the lower end of the mixing barrel is fixedly connected to the discharge pipe, the output end of the motor is fixedly connected to one end of the rotating shaft, the lower end of the rotating shaft is fixedly connected to the main-stage stirring rod, and the main-stage stirring rod is provided with several.

[0010] Preferably, a fixing rod is fixedly connected to the inner wall of the upper end of the mixing barrel, and two fixing rods are provided. The two fixing rods are rotationally symmetrical about the rotating shaft, and the lower end of the fixing rod is fixedly connected to the active gear disk, and the active gear disk is sleeved on the outer wall of the rotating shaft.

[0011] Preferably, the secondary stirring assembly includes a rotating plate, which is fixedly connected to the outer wall of the rotating shaft, and the rotating plate is located below the driving gear disc. Both ends of the rotating plate are rotatably connected to movable rods, and the outer wall of the movable rod is fixedly connected to a driven gear disc, and the driven gear disc is meshingly connected to the driving gear disc.

[0012] Preferably, the secondary stirring assembly further comprises a driven plate, the driven plate is rotatably connected to the outer wall of the rotating shaft, slots are formed on the side walls at both ends of the driven plate, and a magnetic block 1 is fixedly connected to the lower side wall of the driven plate.

[0013] Preferably, the lower end of the movable rod is fixedly connected to a movable plate, the side wall of the movable plate is fixedly connected to a rotating rod, the outer wall of the rotating rod is fixedly connected to a spiral blade, the outer wall of the rotating rod is rotatably connected to a limiting slip ring, and the limiting slip ring is slidably connected to the inner wall of the slot.

[0014] Preferably, the rolling assembly includes a sliding ring, a return spring and a fixed ring, the fixed ring is fixedly connected to the outer wall of the rotating shaft, the return spring is located between the sliding ring and the fixed ring, the sliding ring is slidingly connected to the outer wall of the rotating shaft, and the two ends of the return spring are respectively fixedly connected to the side wall of the sliding ring and the side wall of the fixed ring.

[0015] Preferably, an extension block is fixedly connected to the outer wall of the sliding ring, a second magnetic block is provided on the upper side wall of the extension block, a hinge seat is fixedly connected to the outer wall of the sliding ring, and the extension block and the horizontal plane of the hinge seat are perpendicular to each other.

[0016] Preferably, the outer wall of the fixing ring is fixedly connected to hinge seat 2, hinge seat 2 is rotatably connected to connecting rod 1, the side wall of connecting rod 1 is fixedly connected to a support rod, one end of the support rod is fixedly connected to a rolling plate, the end of connecting rod 1 away from hinge seat 2 is rotatably connected to connecting rod 2, and one end of connecting rod 2 is rotatably connected to hinge seat 1.

[0017] The beneficial effects of the present invention are:

[0018] The motor is started to drive the rotating shaft to rotate, and then drive multiple main-stage stirring rods to stir the materials in the stirring barrel to ensure the stirring effect; at the same time, the driven gear plate is meshed with the active gear plate to drive the movable rod to rotate, and then the rotating rod starts to rotate around the movable rod. The speed difference is formed by different speeds, which effectively improves the flow of materials inside the stirring barrel, thereby realizing the double-stage stirring of the stirring equipment, thereby improving the stirring efficiency, and while the movable rod rotates, the rotating rod can drive the spiral blade to move. During the movement of the spiral blade, the material inside the stirring barrel can be turned outward, and the material outside can be pushed to the center of the stirring barrel, thereby promoting the mixing speed of the materials and avoiding the appearance of dead corners;

[0019] In addition, the rotation of the shaft drives the sliding ring and the fixed ring to rotate synchronously, and the sliding ring slides downward through the magnetic blocks 1 and 2, thereby squeezing the reset spring, so that the end of the connecting rod 2 and the connecting rod 1 connected gradually moves away from the rotating shaft, and drives the tumbling plate to move downward, and the elastic recovery of the reset spring can drive the tumbling plate to move upward, and flip part of the material upward, thereby improving the tumbling effect, and the connecting rod 2 and the connecting rod 1 can also act as stirring rods, which promote the stirring effect while moving up and down, so as to increase the mixing speed of the materials, reduce the use of external driving equipment, and save resources. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0021] Figure 1 It is a schematic diagram of the overall structure of a two-stage stirring and efficient mixing system provided by an embodiment of the present invention;

[0022] Figure 2 This is a schematic diagram of the internal structure of a stirring barrel of a two-stage stirring and efficient mixing system provided by an embodiment of the present invention;

[0023] Figure 3 2. It is a schematic diagram of the top structure of a stirring barrel of a two-stage stirring and efficient mixing system provided by an embodiment of the present invention;

[0024] Figure 4 Schematic diagram of a two-stage stirring structure of a two-stage stirring and efficient mixing system provided by an embodiment of the present invention;

[0025] Figure 5 It is a schematic structural diagram of a secondary stirring component of a two-stage stirring and efficient mixing system provided by an embodiment of the present invention;

[0026] Figure 6 It is a schematic diagram of the upper structural portion of a driven plate of a two-stage stirring and efficient mixing system provided in an embodiment of the present invention;

[0027] Figure 7 It is a schematic diagram of the lower end structure of a driven plate of a two-stage stirring and efficient mixing system provided by an embodiment of the present invention;

[0028] Figure 8 It is a schematic diagram of the structure of a tumbling component of a two-stage stirring and efficient mixing system provided in an embodiment of the present invention.

[0029] In the figure: 1. discharge pipe; 2. stirring barrel; 3. feeding pipe; 4. motor; 5. driving gear disc; 6. secondary stirring assembly; 61. driven gear disc; 62. driven plate; 621. slot hole; 622. magnetic block 1; 63. spiral blade; 64. rotating rod; 65. rotating plate; 66. movable rod; 67. movable plate; 68. limiting slip ring; 7. tumbling assembly; 71. tumbling plate; 72. supporting rod; 73. connecting rod 1; 74. connecting rod 2; 75. extension block; 751. magnetic block 2; 76. sliding ring; 761. hinge seat 1; 77. reset spring; 78. fixing ring; 781. hinge seat 2; 8. rotating shaft; 9. primary stirring rod; 10. fixing rod. DETAILED DESCRIPTION

[0030] 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 will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. 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.

[0031] Example, see Figure 1-Figure 8 A two-stage stirring and efficient mixing system includes a stirring barrel 2, the stirring barrel 2 is connected to a discharge pipe 1 and a feed pipe 3, a motor 4 is provided at the upper end of the stirring barrel 2, and a driving gear disc 5, a rotating shaft 8 and a main stirring rod 9 are provided inside the stirring barrel 2, and also includes:

[0032] A secondary stirring component 6, the secondary stirring component 6 is located inside the stirring barrel 2, and the secondary stirring component 6 utilizes the rotation of the rotating shaft 8 to promote the stirring effect;

[0033] The tumbling assembly 7 is located inside the mixing barrel 2 , and the tumbling assembly 7 utilizes the secondary mixing assembly 6 to enhance the tumbling of the material.

[0034] Furthermore, the upper end of the mixing barrel 2 is fixedly connected to the feed pipe 3 and the motor 4 respectively, the lower end of the mixing barrel 2 is fixedly connected to the discharge pipe 1, the output end of the motor 4 is fixedly connected to one end of the rotating shaft 8, and the lower end of the rotating shaft 8 is fixedly connected to the main-stage stirring rod 9, and the main-stage stirring rod 9 is provided with several.

[0035] It should be noted that materials can be added to the mixing barrel 2 through the feed pipe 3, and there are multiple feed pipes 3, so different materials can be added to the mixing barrel 2 at the same time. When stirring, the motor 4 can be started to drive the rotating shaft 8 to rotate, thereby driving multiple main-stage stirring rods 9 to stir the materials in the mixing barrel 2 to ensure the stirring effect.

[0036] Reference Figure 2-Figure 7 , further; the inner wall of the upper end of the mixing barrel 2 is fixedly connected with a fixed rod 10, and two fixed rods 10 are provided. The two fixed rods 10 are rotationally symmetrical about the rotating shaft 8, and the lower end of the fixed rod 10 is fixedly connected to the active gear plate 5, and the active gear plate 5 is sleeved on the outer wall of the rotating shaft 8; the secondary stirring assembly 6 includes a rotating plate 65, the rotating plate 65 is fixedly connected to the outer wall of the rotating shaft 8, the rotating plate 65 is located below the active gear plate 5, and the two ends of the rotating plate 65 are rotatably connected with active rods 66, and the outer wall of the active rod 66 is fixedly connected with a driven gear plate 61, and the driven gear plate 61 It is meshed and connected with the active gear disc 5; the secondary stirring assembly 6 also includes a driven plate 62, which is rotatably connected to the outer wall of the rotating shaft 8, and slots 621 are provided on the side walls at both ends of the driven plate 62, and a magnetic block 622 is fixedly connected to the lower side wall of the driven plate 62; the lower end of the movable rod 66 is fixedly connected to a movable plate 67, and the side wall of the movable plate 67 is fixedly connected to a rotating rod 64, and the outer wall of the rotating rod 64 is fixedly connected to a spiral blade 63, and the outer wall of the rotating rod 64 is rotatably connected to a limiting slip ring 68, and the limiting slip ring 68 is slidably connected to the inner wall of the slot 621.

[0037] It should be noted that: when the motor 4 drives the rotating shaft 8 to rotate, it also drives the rotating plate 65 to rotate synchronously, thereby driving the rotating rod 64 to revolve around the rotating shaft 8. At this time, the driven gear plate 61 is meshed with the active gear plate 5 to enable the driven gear plate 61 to drive the movable rod 66 to rotate, thereby causing the rotating rod 64 to start rotating around the movable rod 66. The speed difference is formed by different speeds, which effectively improves the flow of materials inside the mixing barrel 2, thereby realizing the double-stage mixing of the mixing equipment, thereby improving the mixing efficiency, and while the movable rod 66 rotates, The rotating rod 64 drives the spiral blade 63 to move. During the movement of the spiral blade 63, on the one hand, the material inside the mixing barrel 2 can be flipped outward, and the material outside can be pushed toward the center of the mixing barrel 2, thereby promoting the mixing speed of the material. At the same time, through the sliding connection between the limit slip ring 68 and the inner wall of the slot 621, the limit slip ring 68 can be synchronously driven to move inside the slot 621 during the movement of the rotating rod 64, thereby driving the driven plate 62 to rotate, thereby providing power for the subsequent tumbling component 7, reducing the use of external driving equipment, and saving resources.

[0038] Reference Figure 8 , further; the tumbling assembly 7 includes a sliding ring 76, a return spring 77 and a fixed ring 78, the fixed ring 78 is fixedly connected to the outer wall of the rotating shaft 8, the return spring 77 is located between the sliding ring 76 and the fixed ring 78, the sliding ring 76 is slidably connected to the outer wall of the rotating shaft 8, and the two ends of the return spring 77 are respectively fixedly connected to the side wall of the sliding ring 76 and the side wall of the fixed ring 78; the outer wall of the sliding ring 76 is fixedly connected to an extension block 75, and the upper side wall of the extension block 75 is provided with a second magnetic block 751, the sliding The outer wall of the moving ring 76 is fixedly connected with a hinge seat 1 761, and the extension block 75 is perpendicular to the horizontal plane of the hinge seat 1 761; the outer wall of the fixed ring 78 is fixedly connected with a hinge seat 2 781, and the hinge seat 2 781 is rotatably connected with a connecting rod 1 73, and the side wall of the connecting rod 1 73 is fixedly connected with a support rod 72, one end of the support rod 72 is fixedly connected with a rolling plate 71, and the end of the connecting rod 1 73 away from the hinge seat 2 781 is rotatably connected with a connecting rod 2 74, and one end of the connecting rod 2 74 is rotatably connected to the hinge seat 1 761.

[0039] It should be noted that: when the motor 4 drives the rotating shaft 8 to rotate, the sliding ring 76 and the fixed ring 78 are driven to rotate synchronously, and the rotation speed of the sliding ring 76 has a speed difference with the rotation speed of the driven plate 62. Therefore, during the rotation process, the driven plate 62 and the horizontal plane of the extension block 75 can be made parallel to each other. At this time, the magnetic block 1 622 is located directly above the magnetic block 2 751, and the magnetic polarity below the magnetic block 1 622 is the same as the polarity of the upper end of the magnetic block 2 751. Therefore, the two will generate a force, and the height position of the driven plate 62 does not change. Therefore, the magnetic block 1 622 will generate a downward force on the magnetic block 2 751. After the extension block 75 is pressed by an external force, it will drive the sliding ring 76 to slide downward on the outer wall of the rotating shaft 8, thereby squeezing the reset spring. Spring 77, during the contraction of the reset spring 77, through the rotational connection between the connecting rod 2 74 and the hinge seat 1 761 and the rotational connection between the connecting rod 1 73 and the hinge seat 2 781, the end of the connecting rod 2 74 and the connecting rod 1 73 connected can gradually move away from the rotating shaft 8, and drive the rolling plate 71 to move downward, and the movement trajectory of the rolling plate 71 and the movement range of the spiral blade 63 do not interfere with each other, and when the magnetic block 1 622 and the magnetic block 2 751 are misaligned with each other, the elastic recovery of the reset spring 77 can drive the rolling plate 71 to move upward, and flip part of the material upward, thereby improving the rolling effect, and the connecting rod 2 74 and the connecting rod 1 73 can also act as stirring rods, which promote the stirring effect while moving up and down, thereby increasing the mixing speed of the material.

[0040] The working principle of the dual-stage stirring and efficient mixing system is as follows: by starting the motor 4 to drive the rotating shaft 8 to rotate, and then drive multiple main-stage stirring rods 9 to stir the materials in the stirring barrel 2 to ensure the stirring effect; while the motor 4 drives the rotating shaft 8 to rotate, it also drives the rotating plate 65 to rotate synchronously, thereby driving the rotating rod 64 to revolve around the rotating shaft 8, at this time, the driven gear disc 61 is meshed with the active gear disc 5, so that the driven gear disc 61 can drive the movable rod 66 to rotate, and then the rotating rod 64 starts to rotate around the movable rod 66, and a speed difference is formed by different speeds, which effectively improves the flow of materials inside the stirring barrel 2, thereby realizing the stirring equipment. The double-stage stirring is realized, thereby improving the stirring efficiency, and the rotating rod 64 can drive the spiral blade 63 to move while the movable rod 66 rotates. During the movement of the spiral blade 63, the material inside the mixing barrel 2 can be turned outward, and the material outside can be pushed toward the center of the mixing barrel 2, thereby promoting the mixing speed of the material. At the same time, through the sliding connection between the limit slip ring 68 and the inner wall of the slot hole 621, the limit slip ring 68 can be synchronously driven to move inside the slot hole 621 during the movement of the rotating rod 64, thereby driving the driven plate 62 to rotate, thereby providing power for the subsequent tumbling component 7, reducing the use of external driving equipment, and saving resources.

[0041] When the motor 4 drives the rotating shaft 8 to rotate, the sliding ring 76 and the fixed ring 78 are driven to rotate synchronously, and the rotation speed of the sliding ring 76 has a speed difference with the rotation speed of the driven plate 62. Therefore, during the rotation process, the driven plate 62 and the horizontal plane of the extension block 75 can be made parallel to each other. At this time, the magnetic block 1 622 is located directly above the magnetic block 2 751, and the magnetism below the magnetic block 1 622 has the same polarity as the upper end of the magnetic block 2 751. Therefore, the two will generate a force, and the height position of the driven plate 62 does not change. Therefore, the magnetic block 1 622 will generate a downward force on the magnetic block 2 751. After the extension block 75 is pressed by an external force, it will drive the sliding ring 76 to slide downward on the outer wall of the rotating shaft 8, thereby squeezing the reset spring 77. During the contraction of the reset spring 77, through the rotational connection between the connecting rod 2 74 and the hinge seat 1 761 and the rotational connection between the connecting rod 1 73 and the hinge seat 2 781, the end of the connecting rod 2 74 and the connecting rod 1 73 connected can gradually move away from the rotating shaft 8, and drive the rolling plate 71 to move downward, and the movement trajectory of the rolling plate 71 and the movement range of the spiral blade 63 do not interfere with each other, and when the magnetic block 1 622 and the magnetic block 2 751 are misaligned with each other, the elastic recovery of the reset spring 77 can drive the rolling plate 71 to move upward, and flip part of the material upward, thereby improving the rolling effect, and the connecting rod 2 74 and the connecting rod 1 73 can also act as stirring rods, which promote the stirring effect while moving up and down, thereby increasing the mixing speed of the material.

[0042] It should be noted that the specific model and specifications of the motor need to be selected and determined based on the actual specifications of the device, and the specific selection calculation method adopts the existing technology in this field, so it will not be described in detail.

[0043] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A two-stage stirring and efficient mixing system, comprising a stirring barrel (2), the stirring barrel (2) being connected to a discharge pipe (1) and a feed pipe (3), a motor (4) being provided at the upper end of the stirring barrel (2), and a driving gear disc (5), a rotating shaft (8) and a main stirring rod (9) being provided inside the stirring barrel (2), characterized in that: Also includes: A secondary stirring component (6), the secondary stirring component (6) is located inside the stirring barrel (2), and the secondary stirring component (6) utilizes the rotation of the rotating shaft (8) to promote the stirring effect; A tumbling assembly (7), wherein the tumbling assembly (7) is located inside the stirring barrel (2), and the tumbling assembly (7) utilizes the secondary stirring assembly (6) to enhance the tumbling of the material.

2. A two-stage stirring and efficient mixing system according to claim 1, characterized in that: The upper end of the stirring barrel (2) is fixedly connected to the feed pipe (3) and the motor (4) respectively, the lower end of the stirring barrel (2) is fixedly connected to the discharge pipe (1), the output end of the motor (4) is fixedly connected to one end of the rotating shaft (8), and the lower end of the rotating shaft (8) is fixedly connected to the main-stage stirring rod (9), and a plurality of the main-stage stirring rods (9) are provided.

3. A two-stage stirring and efficient mixing system according to claim 1, characterized in that: A fixing rod (10) is fixedly connected to the inner wall of the upper end of the mixing barrel (2), and two fixing rods (10) are provided. The two fixing rods (10) are rotationally symmetrical about the rotating shaft (8), and the lower ends of the fixing rods (10) are fixedly connected to the active toothed disc (5), and the active toothed disc (5) is sleeved on the outer wall of the rotating shaft (8).

4. A two-stage stirring and efficient mixing system according to claim 1, characterized in that: The secondary stirring assembly (6) comprises a rotating plate (65), wherein the rotating plate (65) is fixedly connected to the outer wall of the rotating shaft (8), and the rotating plate (65) is located below the active toothed disc (5). Both ends of the rotating plate (65) are rotatably connected to movable rods (66), and the outer wall of the movable rod (66) is fixedly connected to a driven toothed disc (61), and the driven toothed disc (61) is meshingly connected to the active toothed disc (5).

5. A two-stage stirring and efficient mixing system according to claim 4, characterized in that: The secondary stirring assembly (6) further comprises a driven plate (62), wherein the driven plate (62) is rotatably connected to the outer wall of the rotating shaft (8), slots (621) are provided on the side walls at both ends of the driven plate (62), and a magnetic block 1 (622) is fixedly connected to the lower side wall of the driven plate (62).

6. A two-stage stirring and efficient mixing system according to claim 5, characterized in that: The lower end of the movable rod (66) is fixedly connected to a movable plate (67), the side wall of the movable plate (67) is fixedly connected to a rotating rod (64), the outer wall of the rotating rod (64) is fixedly connected to a spiral blade (63), the outer wall of the rotating rod (64) is rotatably connected to a limit slip ring (68), and the limit slip ring (68) is slidably connected to the inner wall of the slot (621).

7. A two-stage stirring and efficient mixing system according to claim 1, characterized in that: The tumbling assembly (7) comprises a sliding ring (76), a return spring (77) and a fixed ring (78); the fixed ring (78) is fixedly connected to the outer wall of the rotating shaft (8); the return spring (77) is located between the sliding ring (76) and the fixed ring (78); the sliding ring (76) is slidably connected to the outer wall of the rotating shaft (8); and the two ends of the return spring (77) are respectively fixedly connected to the side wall of the sliding ring (76) and the side wall of the fixed ring (78).

8. A two-stage stirring and efficient mixing system according to claim 7, characterized in that: The outer wall of the sliding ring (76) is fixedly connected to an extension block (75), the upper side wall of the extension block (75) is provided with a second magnetic block (751), the outer wall of the sliding ring (76) is fixedly connected to a hinge seat (761), and the horizontal planes of the extension block (75) and the hinge seat (761) are perpendicular to each other.

9. A two-stage stirring and efficient mixing system according to claim 8, characterized in that: The outer wall of the fixing ring (78) is fixedly connected to hinge seat 2 (781), hinge seat 2 (781) is rotatably connected to connecting rod 1 (73), the side wall of connecting rod 1 (73) is fixedly connected to a support rod (72), one end of the support rod (72) is fixedly connected to a rolling plate (71), one end of connecting rod 1 (73) away from hinge seat 2 (781) is rotatably connected to connecting rod 2 (74), and one end of connecting rod 2 (74) is rotatably connected to hinge seat 1 (761).

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