Anti-caking sludge storage and transportation device

Abstract

The present invention discloses a sludge storage and transportation device for preventing compaction, comprising a transportation device body, an electric telescopic rod and an auxiliary mechanism, wherein the transportation device body is rotatably connected with a hydraulic telescopic rod, and the upper end of the hydraulic telescopic rod is rotatably connected to a support frame, a storage tank body is arranged at the upper end of the support frame, and a first motor is arranged on the left side of the storage tank body, the first motor is connected to a first rotating shaft, a gear ring is arranged on the outer side of the first connecting shaft, the right end of the transmission shaft passes through a scraper frame and is rotatably connected to the inner wall of the storage tank body, and the auxiliary mechanism is arranged at the upper end of the support frame. The sludge storage and transportation device for preventing compaction, the first motor drives the transmission shaft to rotate and drives the spiral blade to rotate, the spiral blade can push the sludge accumulated on the right side of the storage tank body to the left, so that the sludge is evenly distributed in the storage tank body, and the sludge is stirred under the drive of the transmission shaft and the stirring blade during transportation to reduce the sludge precipitation and compaction.

Description

Technical Field

[0001] The invention relates to the technical field related to sludge, in particular to an anti-caking sludge storage and transportation device. Background Art

[0002] The sludge storage and transportation device is used as a loading tool for urban sludge removal, but the general sludge storage and transportation device has a simple structure and is prone to sedimentation and compaction during the sludge transportation process. When the sludge is unloaded, some of the sludge will adhere to the inner wall and is difficult to clean. The sludge accumulates for a long time and occupies space, which reduces the actual sludge storage capacity of the sludge storage and transportation device. Now, an anti-compaction sludge storage and transportation device is needed to solve the above problems. Summary of the invention

[0003] The purpose of the present invention is to provide a sludge storage and transportation device that prevents compaction, so as to solve the problem that the general sludge storage and transportation device proposed in the above background technology has a simple structure, is easy to settle and compact during the sludge transportation process, and part of the sludge will adhere to the inner wall when the sludge is unloaded, which is difficult to clean. The sludge accumulates for a long time and occupies space, reducing the actual sludge storage capacity of the sludge storage and transportation device.

[0004] To achieve the above object, the present invention provides the following technical solution: an anti-caking sludge storage and transportation device, comprising a transportation device body, an electric telescopic rod and an auxiliary mechanism,

[0005] A transport device body, wherein a hydraulic telescopic rod is rotatably connected to the transport device body, and the upper end of the hydraulic telescopic rod is rotatably connected to the support frame, a storage tank body is arranged at the upper end of the support frame, and a first motor is arranged on the left side of the storage tank body, the first motor is connected to the first rotating shaft, and the first rotating shaft is connected to the first connecting shaft through a first bevel gear set, a gear ring is arranged on the outer side of the first connecting shaft, and the gear ring is arranged on the right side of the first bevel gear set, an inner tube disc body is penetrated on the outer side of the first connecting shaft, and the inner tube disc body penetrates the left side of the storage tank body and is connected to the scraper, and the scraper is rotatably connected to the transmission shaft, the right end of the transmission shaft penetrates the scraper and is rotatably connected to the inner wall of the storage tank body, and the left side of the transmission shaft penetrates the scraper and is connected to the first connecting shaft, a spiral blade and a stirring blade are arranged on the transmission shaft, and the spiral blade and the stirring blade are staggered;

[0006] An electric telescopic rod, wherein the electric telescopic rod is arranged on the inner side wall of the inner tube disc, and the inner end of the electric telescopic rod is connected to the connecting mechanism, and the inner end of the connecting mechanism is connected to the gear block;

[0007] The auxiliary mechanism is arranged at the upper end of the support frame, and the auxiliary mechanism is arranged below the storage tank body, and a discharge mechanism is arranged at the lower right end of the storage tank body.

[0008] Preferably, the hydraulic telescopic rod and the support frame form a telescopic mechanism, and one end of the support frame away from the hydraulic telescopic rod is rotatably connected to the transport device body.

[0009] Preferably, the storage tank body comprises a coil hanger, a sludge pump and a suction pipe, and the coil hanger is arranged on the right side of the storage tank body, and the sludge pump is arranged on the upper end of the storage tank body, and the sludge pump is connected to the suction pipe.

[0010] Preferably, the first motor, the first rotating shaft, the first bevel gear set, the first connecting shaft, the transmission shaft, the spiral blades and the stirring blades constitute a rotating mechanism.

[0011] Preferably, the transmission shaft includes an air passage and an air nozzle, and the air passage is arranged inside the transmission shaft, and the air passage is communicated with the air nozzle.

[0012] Preferably, the electric telescopic rod and the connecting mechanism constitute a telescopic mechanism, and the connecting mechanism is symmetrically arranged about the center line of the gear ring.

[0013] Preferably, the connecting mechanism includes a frame body, a spring and a connecting block, and a spring is arranged on the inner end surface of the frame body, the inner end of the spring is connected to the connecting block, and the inner end of the connecting block passes through the frame body and is connected to the tooth block, and the frame body and the connecting block are slidingly connected.

[0014] Preferably, the auxiliary mechanism includes a water tank, a water pump, a water pipe, a first pipe valve, a connecting pipe, an air pipe, a second pipe valve and a high-pressure air pump, and a water pump is arranged in the water tank, the water pump is connected to the water pipe, and the end of the water pipe away from the water pump is connected to the connecting pipe, and at the same time, a first pipe valve is arranged on the water pipe, the connecting pipe is connected to the high-pressure air pump through the air pipe, and a second pipe valve is arranged on the air pipe.

[0015] Preferably, the unloading mechanism includes a material receiving pipe, a unloading pipe, a discharge pipe, a second motor, a second rotating shaft, a synchronous belt, a second connecting shaft and an auger, and the material receiving pipe is connected to the lower end of the storage tank body, the end of the material receiving pipe away from the storage tank body is connected to the unloading pipe, and a discharge pipe is arranged on the right side of the unloading pipe, a second motor is arranged on the front side of the unloading pipe, and the second motor is connected to the second rotating shaft, the second rotating shaft is connected to the second connecting shaft through a synchronous belt, and the upper end of the second connecting shaft passes through the lower end of the unloading pipe and is connected to the auger, and the auger is rotatably connected to the inner wall of the unloading pipe.

[0016] Compared with the prior art, the invention has the following beneficial effects: the anti-caking sludge storage and transportation device,

[0017] (1) A first motor, a first rotating shaft, a first bevel gear set, a first connecting shaft, a transmission shaft, a spiral blade and a stirring blade are provided. When the sludge is loaded, the transmission shaft is driven to rotate under the action of the first motor to drive the spiral blade to rotate. The spiral blade can push the sludge accumulated on the right side of the storage tank body to the left, so that the sludge is evenly distributed in the storage tank body. During transportation, the sludge is stirred under the drive of the transmission shaft and the stirring blade to reduce the sludge precipitation and compaction;

[0018] (2) An electric telescopic rod, a connecting mechanism and a gear block are provided. When the sludge is unloaded from the storage tank, the gear block is pushed to engage with the gear ring under the action of the electric telescopic rod. Under the action of the first motor, the inner tube disc can be driven to rotate through the first connecting shaft, thereby driving the scraper to scrape the inner wall of the storage tank;

[0019] (3) The high-pressure air pump, air pipe, connecting pipe, air channel and air nozzle blow air into the storage tank, and cooperate with the stirring blade to enhance the stirring effect of the sludge. In addition, water can be sprayed to wash the inner wall of the storage tank under the action of the water pump, water pipe, connecting pipe, air channel and air nozzle;

[0020] (4) When unloading, the support frame can be lifted up under the action of the hydraulic telescopic rod, the angle of the storage tank can be appropriately adjusted, and the material receiving pipe can be opened to allow the sludge to enter the unloading pipe through the material receiving pipe. Under the action of the second motor, the second rotating shaft, the synchronous belt, and the second connecting shaft drive the auger to rotate to lift the sludge and discharge it through the discharge pipe. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the front cross-sectional structure of the present invention;

[0022] Figure 2 It is a front view structural schematic diagram of the present invention;

[0023] Figure 3 It is a schematic diagram of the connection structure between the gear ring and the gear block of the present invention;

[0024] Figure 4 It is a schematic diagram of the structure of the connecting mechanism of the present invention;

[0025] Figure 5 This is a schematic diagram of the internal structure of the transmission shaft of the present invention;

[0026] Figure 6 It is a schematic diagram of the structure of the unloading mechanism of the present invention;

[0027] Figure 7 It is a schematic diagram of the first connecting shaft and the scraper structure of the present invention.

[0028] In the figure: 1, transport device body, 2, hydraulic telescopic rod, 3, support frame, 4, storage tank body, 401, coil hanger, 402, sludge pump, 403, suction pipe, 5, first motor, 6, first rotating shaft, 7, first bevel gear set, 8, first connecting shaft, 9, ring gear, 10, transmission shaft, 1001, air duct, 1002, air nozzle, 11, spiral blade, 12, stirring blade, 13, inner tube coil body, 14, scraper, 15, electric telescopic rod, 16, connecting mechanism, 1601, frame body, 1602, spring, 1603. Connecting block. 17. Gear block. 18. Auxiliary mechanism. 1801. Water tank. 1802. Water pump. 1803. Water pipe. 1804. First pipe valve. 1805. Connecting pipe. 1806. Air pipe. 1807. Second pipe valve. 1808. High-pressure air pump. 19. Unloading mechanism. 1901. Receiving pipe. 1902. Unloading pipe. 1903. Discharging pipe. 1904. Second motor. 1905. Second rotating shaft. 1906. Synchronous belt. 1907. Second connecting shaft. 1908. Auger. DETAILED DESCRIPTION

[0029] 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.

[0030] See also Figure 1-7 The present invention provides a technical solution: a sludge storage and transportation device for preventing compaction, such as Figure 1 and Figure 2As shown, a hydraulic telescopic rod 2 is rotatably connected to the transport device body 1, and the upper end of the hydraulic telescopic rod 2 is rotatably connected to the support frame 3. The hydraulic telescopic rod 2 and the support frame 3 form a telescopic mechanism, and the end of the support frame 3 away from the hydraulic telescopic rod 2 is rotatably connected to the transport device body 1. The support frame 3 is lifted up by the hydraulic telescopic rod 2, so that the storage tank body 4 is tilted for easy unloading. The storage tank body 4 is arranged on the upper end of the support frame 3, and the first motor 5 is arranged on the left side of the storage tank body 4. The storage tank body 4 includes a coil hanger 401, a sludge pump 402 and a suction pipe 403, and the coil hanger is arranged on the right side of the storage tank body 4. 401, a sludge pump 402 is arranged at the upper end of the storage tank body 4, and the sludge pump 402 is connected with the suction pipe 403, and the sludge can be conveniently pumped into the storage tank body 4 through the sludge pump 402 and the suction pipe 403, and the coil hanger 401 is convenient for storing and hanging the suction pipe 403, and the first motor 5, the first rotating shaft 6, the first bevel gear set 7, the first connecting shaft 8, the transmission shaft 10, the spiral blade 11 and the stirring blade 12 constitute a rotating mechanism, and the first motor 5 drives the spiral blade 11 to rotate through the transmission shaft 10, so as to push the sludge to the left, and the stirring blade 12 can rotate to stir the sludge to reduce the precipitation and compaction.

[0031] like Figure 1 , Figure 2 , Figure 5 and Figure 7 As shown, the first motor 5 is connected to the first rotating shaft 6, and the first rotating shaft 6 is connected to the first connecting shaft 8 through the first bevel gear set 7. A gear ring 9 is arranged on the outside of the first connecting shaft 8, and the gear ring 9 is arranged on the right side of the first bevel gear set 7. An inner tube disc 13 is penetrated on the outside of the first connecting shaft 8, and the inner tube disc 13 penetrates the left side of the storage tank body 4 and is connected to the scraper 14. At the same time, the scraper 14 is rotatably connected to the transmission shaft 10. The scraper 14 and the inner wall of the storage tank body 4 are slidably connected. The right end of the transmission shaft 10 penetrates the scraper 14 and is rotatably connected to the inner wall of the storage tank body 4, and the left side of the transmission shaft 10 penetrates The scraper 14 is connected to the first connecting shaft 8, the transmission shaft 10 includes an air duct 1001 and an air nozzle 1002, and the air duct 1001 is arranged inside the transmission shaft 10, and the air duct 1001 is communicated with the air nozzle 1002, the air duct 1001 and the air nozzle 1002 are convenient for the flow and ejection of gas or liquid, the air duct 1001 is communicated with the first connecting shaft 8, the interior of the first connecting shaft 8 is a hollow structure, and the first connecting shaft 8 and the connecting pipe 1805 are sealed and rotatably connected, the transmission shaft 10 is provided with spiral blades 11 and stirring blades 12, and the spiral blades 11 and the stirring blades 12 are staggered.

[0032] like Figure 1 , Figure 3 , Figure 4 and Figure 6As shown, the electric telescopic rod 15 is arranged on the inner wall of the inner tube disc 13, and the inner end of the electric telescopic rod 15 is connected to the connecting mechanism 16, and the inner end of the connecting mechanism 16 is connected to the tooth block 17. The electric telescopic rod 15 and the connecting mechanism 16 constitute a telescopic mechanism, and the connecting mechanism 16 is symmetrically arranged about the center line of the gear ring 9. The electric telescopic rod 15 pushes the connecting mechanism 16 so that the tooth block 17 and the gear ring 9 are in contact and engaged. The connecting mechanism 16 includes a frame body 1601, a spring 1602 and a connecting block 1603, and the inner end surface of the frame body 1601 is provided with a spring 1602, the inner end of the spring 1602 is connected to the connecting block 1603, and the inner end of the connecting block 1603 passes through the frame body 1601 and is connected to the tooth block 17, and the frame body 1601 There is a sliding connection between the support frame 3 and the connecting block 1603, and the spring 1602 has a buffering and compensating effect on the connecting block 1603, and the connecting block 1603 and the frame body 1601 are slidably connected through a slide groove, the auxiliary mechanism 18 is arranged at the upper end of the support frame 3, and the auxiliary mechanism 18 is arranged below the storage tank body 4, and a discharge mechanism 19 is arranged at the lower right end of the storage tank body 4, and the auxiliary mechanism 18 includes a water tank 1801, a water pump 1802, a water pipe 1803, a first pipe valve 1804, a connecting pipe 1805, an air pipe 1806, a second pipe valve 1807 and a high-pressure air pump 1808, and a water pump 1802 is arranged in the water tank 1801, the water pump 1802 is connected to the water pipe 1803, and the water pipe 1803 is away from the water pump 1 One end of the water pipe 1802 is connected to the connecting pipe 1805, and the water pipe 1803 is provided with a first pipe valve 1804. The connecting pipe 1805 is connected to the high-pressure air pump 1808 through the air pipe 1806, and the air pipe 1806 is provided with a second pipe valve 1807. The high-pressure air pump 1808, the air pipe 1806, the connecting pipe 1805, the air channel 1001 and the air nozzle 1002 blow air into the storage tank body 4, and cooperate with the stirring blade 12 to enhance the stirring effect of the sludge. In addition, water can be sprayed to wash the inner wall of the storage tank body 4 under the action of the water pump 1802, the water pipe 1803, the connecting pipe 1805, the air channel 1001 and the air nozzle 1002. The unloading mechanism 19 includes a receiving pipe 1901, a unloading pipe 1902, a discharging pipe 1903, The second motor 1904, the second rotating shaft 1905, the synchronous belt 1906, the second connecting shaft 1907 and the auger 1908, and the material receiving pipe 1901 is connected to the lower end of the storage tank body 4, the end of the material receiving pipe 1901 away from the storage tank body 4 is connected to the discharge pipe 1902, and the discharge pipe 1903 is arranged on the right side of the discharge pipe 1902, and the second motor 1904 is arranged on the front side of the discharge pipe 1902, and the second motor 1904 is connected to the second rotating shaft 1905, the second rotating shaft 1905 is connected to the second connecting shaft 1907 through the synchronous belt 1906, and the upper end of the second connecting shaft 1907 passes through the lower end of the discharge pipe 1902 and is connected to the auger 1908, and the auger 1908 is rotatably connected to the inner wall of the discharge pipe 1902,The second motor 1904 drives the auger 1908 to rotate, lifting the sludge and discharging it through the discharge pipe 1903.

[0033] Working principle: When using the anti-caking sludge storage and transportation device, remove the suction pipe 403 from the coil hanger 401 and put it into the sludge to be transported. The sludge is pumped into the storage tank 4 under the action of the sludge pump 402. The first motor 5 drives the first rotating shaft 6 to rotate. The first rotating shaft 6 drives the first connecting shaft 8 to rotate through the first bevel gear set 7. The first connecting shaft 8 drives the transmission shaft 10 to rotate. The sludge is pushed to the left under the action of the spiral blade 11, so that the sludge is evenly distributed in the storage tank. The sludge can be stirred in the storage tank 4 by rotating the stirring blades 12 during transportation to reduce the precipitation and hardening. The second pipe valve 1807 is opened, and air is blown into the storage tank 4 under the action of the high-pressure air pump 1808, the air pipe 1806, the connecting pipe 1805, the air channel 1001 and the air nozzle 1002 to enhance the stirring effect of the sludge. When unloading, the material receiving pipe 1901 is opened so that the sludge enters the unloading pipe 1902 through the material receiving pipe 1901. The motor 1904 drives the second rotating shaft 1905 to rotate, and the second rotating shaft 1905 drives the second connecting shaft 1907 to rotate through the synchronous belt 1906, and the second connecting shaft 1907 drives the auger 1908 to rotate to lift the sludge and discharge it through the discharge pipe 1903. In addition, under the action of the hydraulic telescopic rod 2, the support frame 3 is lifted up to adjust the angle of the storage tank body 4 to facilitate sludge unloading. After the sludge is discharged, when the inner wall of the storage tank body 4 is cleaned, the tooth block 17 is pushed to engage and connect with the gear ring 9 under the action of the electric telescopic rod 15. Under the action of the first motor 5, the inner pipe disc 13 can be driven to rotate through the first connecting shaft 8, thereby driving the scraper 14 to scrape the inner wall of the storage tank body 4. The first pipe valve 1804 is opened, and water can be sprayed to rinse the inner wall of the storage tank body 4 under the action of the water pump 1802, the water pipe 1803, the connecting pipe 1804, the airway 1001 and the air nozzle 1002. The contents not described in detail in this specification belong to the prior art known to professional and technical personnel in this field.

[0034] The directions or positional relationships indicated by terms such as "center", "longitudinal", "lateral", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" are based on the directions or positional relationships shown in the accompanying drawings. They are merely simplified descriptions for the convenience of describing the present invention, and do not indicate or imply that the devices or elements referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they should not be understood as limitations on the protection content of the present invention.

[0035] Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A sludge storage and transportation device for preventing compaction, comprising a transportation device body (1), an electric telescopic rod (15) and an auxiliary mechanism (18), characterized in that: A transport device body (1), wherein a hydraulic telescopic rod (2) is rotatably connected to the transport device body (1), and the upper end of the hydraulic telescopic rod (2) is rotatably connected to a support frame (3), a storage tank body (4) is arranged at the upper end of the support frame (3), and a first motor (5) is arranged on the left side of the storage tank body (4), the first motor (5) is connected to a first rotating shaft (6), and the first rotating shaft (6) is connected to a first connecting shaft (8) through a first bevel gear set (7), a gear ring (9) is arranged on the outer side of the first connecting shaft (8), and the gear ring (9) is arranged on the right side of the first bevel gear set (7), An inner tube disc (13) is provided on the outer side of the first connecting shaft (8), and the inner tube disc (13) passes through the left side of the storage tank body (4) and is connected to the scraper (14), and the scraper (14) is rotatably connected to the transmission shaft (10), the right end of the transmission shaft (10) passes through the scraper (14) and is rotatably connected to the inner wall of the storage tank body (4), and the left side of the transmission shaft (10) passes through the scraper (14) and is connected to the first connecting shaft (8), and the transmission shaft (10) is provided with a spiral blade (11) and a stirring blade (12), and the spiral blade (11) and the stirring blade (12) are arranged alternately; An electric telescopic rod (15), wherein the electric telescopic rod (15) is arranged on the inner side wall of the inner tube disc body (13), and the inner end of the electric telescopic rod (15) is connected to a connecting mechanism (16), and the inner end of the connecting mechanism (16) is connected to a tooth block (17), wherein the connecting mechanism (16) comprises a frame body (1601), a spring (1602) and a connecting block (1603), and the inner end surface of the frame body (1601) is provided with a spring (1602), the inner end of the spring (1602) is connected to the connecting block (1603), and the inner end of the connecting block (1603) passes through the frame body (1601) and is connected to the tooth block (17), and the frame body (1601) and the connecting block (1603) are slidably connected; An auxiliary mechanism (18), wherein the auxiliary mechanism (18) is arranged at the upper end of the support frame (3), and the auxiliary mechanism (18) is arranged below the storage tank body (4), and a discharge mechanism (19) is arranged at the lower right end of the storage tank body (4), and the auxiliary mechanism (18) comprises a water tank (1801), a water pump (1802), a water pipe (1803), a first pipe valve (1804), a connecting pipe (1805), an air pipe (1806), a second pipe valve (1807) and a high-pressure air pump (1808) , and a water pump (1802) is provided in the water tank (1801), the water pump (1802) is connected to a water pipe (1803), and the end of the water pipe (1803) away from the water pump (1802) is connected to a connecting pipe (1805), and a first pipe valve (1804) is provided on the water pipe (1803), and the connecting pipe (1805) is connected to a high-pressure air pump (1808) via an air pipe (1806), and a second pipe valve (1807) is provided on the air pipe (1806); The unloading mechanism (19) comprises a material receiving pipe (1901), a unloading pipe (1902), a discharging pipe (1903), a second motor (1904), a second rotating shaft (1905), a synchronous belt (1906), a second connecting shaft (1907) and an auger (1908), wherein the material receiving pipe (1901) is connected to the lower end of the storage tank body (4), the end of the material receiving pipe (1901) away from the storage tank body (4) is connected to the unloading pipe (1902), and a right side of the unloading pipe (1902) is provided with A discharge pipe (1903), a second motor (1904) is arranged on the front side of the discharge pipe (1902), and the second motor (1904) is connected to a second rotating shaft (1905), and the second rotating shaft (1905) is connected to a second connecting shaft (1907) through a synchronous belt (1906), and the upper end of the second connecting shaft (1907) passes through the lower end of the discharge pipe (1902) and is connected to an auger (1908), and the auger (1908) is rotatably connected to the inner wall of the discharge pipe (1902).

2. The anti-caking sludge storage and transportation device according to claim 1 is characterized in that: The hydraulic telescopic rod (2) and the support frame (3) form a telescopic mechanism, and one end of the support frame (3) away from the hydraulic telescopic rod (2) is rotatably connected to the transport device body (1).

3. The anti-caking sludge storage and transportation device according to claim 1 is characterized in that: The storage tank body (4) comprises a coil hanger (401), a sludge pump (402) and a suction pipe (403), and the coil hanger (401) is arranged on the right side of the storage tank body (4), and the sludge pump (402) is arranged on the upper end of the storage tank body (4), and the sludge pump (402) is connected to the suction pipe (403).

4. The anti-caking sludge storage and transportation device according to claim 1 is characterized in that: The first motor (5), the first rotating shaft (6), the first bevel gear set (7), the first connecting shaft (8), the transmission shaft (10), the spiral blade (11) and the stirring blade (12) form a rotating mechanism.

5. The anti-caking sludge storage and transportation device according to claim 1 is characterized in that: The transmission shaft (10) comprises an air passage (1001) and an air nozzle (1002), and the air passage (1001) is arranged inside the transmission shaft (10), and the air passage (1001) is communicated with the air nozzle (1002).

6. The anti-caking sludge storage and transportation device according to claim 1 is characterized in that: The electric telescopic rod (15) and the connecting mechanism (16) form a telescopic mechanism, and the connecting mechanism (16) is symmetrically arranged with respect to the center line of the gear ring (9).

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