Oil-water separation and purification device for oil field produced liquid

Abstract

The invention relates to the technical field of petroleum processing, and discloses an oil field produced liquid oil-water separation and purification device which comprises a shell, an upper baffle is fixedly connected to the inner wall of the upper side of the shell, a mounting plate is fixedly connected to the interior of the shell, a driving motor is fixedly connected to the upper surface of the mounting plate, and a transmission worm is fixedly connected to the output end of the driving motor. A rotating block is fixedly connected to the outer wall of the transmission worm, a transmission rod is fixedly connected to the interior of the rotating block, a limiting block is fixedly connected to the inner wall of the middle of the shell, a chemical agent storage box is fixedly connected to the inner wall of the middle of the shell, a positioning block is fixedly connected to the outer wall of the limiting block, and a push rod is slidably connected to the inner wall of the positioning block. The driving motor is started to drive the transmission worm to rotate, the transmission worm can drive the rotating block to rotate when rotating, and finally the purpose of avoiding manual addition of excessive high-concentration disinfectant at a time is achieved, so that the effect of ensuring sufficient purification of an oil-water mixture can be achieved.

Description

Technical Field

[0001] The invention relates to the technical field of petroleum processing, in particular to an oil-water separation and purification device for oilfield produced liquid. Background Art

[0002] As an important industrial raw material, petroleum products such as gasoline, diesel and kerosene are widely used in automobiles, airplanes and ships in the transportation industry. Moreover, petroleum can be converted into various chemical products such as plastics, fertilizers, synthetic rubber, synthetic fibers, medicines and cosmetics through refining. Therefore, petroleum processing is a vital industrial activity. In the process of collecting crude oil in oil fields, produced liquid oil-water separation and purification devices are often used. For example, patent publication number CN106995717A discloses a method for separating oil and water in oil field produced liquid using a produced liquid separation device of a centralized processing station. The technical scheme is as follows: the liquid inlet of the oil-water separation device before the tank is connected with an oil field produced liquid inlet pipe, the discharge port of the oil-water separation device before the tank is connected with the liquid inlet of the first settling tank through a pipeline, and a dosing device is connected in series on the pipeline between the oil-water separation device before the tank and the first settling tank. Patent publication number CN110656921A discloses an oilfield produced liquid processing device, which includes a horizontal tank, which is provided with a liquid inlet port, and is provided with a rectifying chamber, a coalescing chamber, an ultrasonic chamber, a sedimentation chamber, an oil chamber and a water chamber; the rectifying chamber is connected to the liquid inlet port, and is used to rectify the oilfield produced liquid entering the liquid inlet port; the coalescing chamber is used to coalesce and dehydrate the oilfield produced liquid rectified by the rectifying chamber; the ultrasonic chamber is used to perform ultrasonic demulsification and demulsifier demulsification on the oil-containing part of the oilfield produced liquid after coalescing and dehydration in the coalescing chamber; the sedimentation chamber is used to receive the oilfield produced liquid after demulsification in the ultrasonic chamber and perform sedimentation separation.

[0003] The above-mentioned existing produced fluid oil-water separation and purification device purifies, disinfects and stratifies the produced fluid by manually adding a certain amount of chemical agents. However, the existing produced fluid oil-water separation and purification device adds all the chemical agents at one time through the dosing device, which causes the chemical agents to disperse slowly in the produced fluid, thereby resulting in the problem that the oil-water mixture cannot be fully purified and mixed and stratified. Summary of the invention

[0004] In view of the deficiencies in the prior art, the present invention provides an oil-water separation and purification device for oilfield produced fluid, which solves the problem that the oil-water mixture cannot be fully purified due to slow local dispersion of the separation and purification device.

[0005] To achieve the above objectives, the present invention is implemented through the following technical solutions: an oilfield produced liquid oil-water separation and purification device, comprising a shell, an upper baffle is fixedly connected to the upper inner wall of the shell, a produced liquid inlet and a chemical agent inlet are arranged on the upper baffle, a mounting plate is fixedly connected to the inside of the shell, a driving motor is fixedly connected to the upper surface of the mounting plate, a transmission worm is fixedly connected to the output end of the driving motor, a rotating block is fixedly connected to the outer wall of the transmission worm, a transmission rod is fixedly connected to the inside of the rotating block, a limiting block is fixedly connected to the middle inner wall of the shell, a chemical agent storage box is fixedly connected to the middle inner wall of the shell, a positioning block is fixedly connected to the outer wall of the limiting block, a push rod is slidably connected to the inner wall of the positioning block, the outer wall of the transmission rod is rotatably connected to the inner wall of the push rod, a discharge pipe is fixedly connected to the inside of the chemical agent storage box, the upper surface of the push rod is arranged on the lower surface of the discharge pipe, a rotating assembly is arranged on the outer wall of the transmission worm, and the rotating assembly is used to drive the rotating plate to rotate.

[0006] Preferably, the rotating assembly includes a transmission worm wheel, the outer wall of which is meshingly connected to the outer wall of the transmission worm, the interior of the transmission worm wheel is fixedly connected to a first rotating column, and the upper outer wall of the first rotating column is rotatably connected to the interior of the upper baffle.

[0007] Preferably, a rotating plate is fixedly connected to the lower outer wall of the first rotating column, and the left and right inner walls of the rotating plate are rotatably connected to the second rotating columns.

[0008] Preferably, the middle outer wall of the second rotating column is fixedly connected to a transmission gear, the lower outer wall of the second rotating column is fixedly connected to a roller, the middle inner wall of the outer shell is fixedly connected to a fixing rod, the outer wall of the fixing rod is fixedly connected to a first gear ring, and the outer wall of the transmission gear is meshedly connected to the inner wall of the first gear ring.

[0009] Preferably, a ratchet is fixedly connected to the lower surface of the first rotating column, and the outer wall of the ratchet is meshingly connected with ratchet teeth.

[0010] Preferably, a third rotating column is provided on the lower surface of the ratchet, a rotating shaft is fixedly connected to the inside of the ratchet, a reset spring is provided to the inside of the third rotating column, the outer wall of the reset spring is fixedly connected to the inside of the ratchet, and the inner wall of the ratchet is rotatably connected to the outer wall of the rotating shaft.

[0011] Preferably, a lower baffle is fixedly connected to the lower inner wall of the shell, a lower fixing plate is fixedly connected to the upper surface of the lower baffle, a second toothed ring is arranged on the upper surface of the lower fixing plate, and an upper fixing plate is arranged on the upper surface of the second toothed ring.

[0012] Preferably, a third transmission block is fixedly connected to the upper surface of the lower fixed plate, a first transmission block is rotatably connected to the inner wall of the lower fixed plate, and a column is fixedly connected to the upper surface of the lower fixed plate.

[0013] Preferably, the outer wall of the column is arranged inside the upper fixed plate, and the outer wall of the third transmission block is meshedly connected with the second transmission block.

[0014] Preferably, the outer wall of the second transmission block is meshedly connected to the inner wall of the second gear ring, the lower surface of the second transmission block is arranged on the upper surface of the lower fixed plate, the upper outer wall of the first transmission block is rotatably connected to the inner wall of the upper fixed plate, and the middle outer wall of the first transmission block is meshedly connected to the inner wall of the second gear ring.

[0015] Working principle: When the device is needed, the control system controls the device to inject the produced liquid and chemical agents into the storage box to meet the process requirements. First, the drive motor is started to drive the transmission worm to rotate. When the transmission worm rotates driven by the drive motor, the transmission worm will drive the rotating block to rotate. When the rotating block rotates driven by the transmission worm, the rotating block will drive the transmission rod to rotate. When the transmission rod rotates driven by the rotating block, the transmission rod will drive the push rod to slide on the inner wall of the positioning block. At this time, the push rod leaves from the lower side of the discharge pipe, and the disinfectant enters the inner part of the shell from the chemical storage box, while the push rod makes a reciprocating motion left and right, so that the chemical storage box automatically performs periodic quantitative unloading, and finally avoids the manual addition of too much high-concentration at one time. The purpose of the disinfectant is to ensure that the oil-water mixture is fully purified; the driving motor is started to drive the transmission worm to rotate. When the transmission worm rotates driven by the driving motor, the transmission worm will drive the transmission worm wheel to rotate. When the transmission worm wheel rotates driven by the transmission worm, the transmission worm wheel will drive the first rotating column to rotate inside the upper baffle. When the first rotating column rotates driven by the transmission worm wheel, the first rotating column will drive the rotating plate to rotate. When the rotating plate rotates driven by the first rotating column, the rotating plate will drive the second rotating column to rotate. When the second rotating column rotates driven by the rotating plate, the second rotating column will drive the transmission gear to rotate inside the first gear ring. When the transmission gear rotates inside the first gear ring, the transmission The gear will drive the second rotating column to rotate inside the rotating plate. When the second rotating column rotates inside the rotating plate, the second rotating column will drive the roller to rotate. The roller rotates around the first rotating column while rotating, and finally achieves the purpose of high-speed stirring of the oil-water mixture inside the shell, thereby achieving the effect of centrifuging the oil-water mixture and then stratifying the oil and water; the control system controls the motor to stop and stand still. When the oil and water are stratified, the oil layer is on the top and the water layer is on the bottom. At this time, the control system reversely starts the drive motor to drive the first rotating column to rotate in the opposite direction, and then the reset spring is stuck in the ratchet so that the reset spring is connected to the ratchet. When the ratchet rotates on the upper surface of the third rotating column driven by the first rotating column, the ratchet will drive the ratchet teeth to rotate. When the ratchet teeth are on the belt of the ratchet wheel When the gear is driven by the first gear, the second gear ring will drive the second gear ring to rotate on the surface of the third gear block. At this time, the second gear ring will drive the second gear ring to rotate on the surface of the third gear block. At this time, the second gear block is opened to discharge the stratified oil-water mixture through the drainage hole inside the lower baffle plate, and the water layer and the oil layer are collected separately, so as to achieve the effect of conveniently collecting the separated and purified oil-water mixture.An oil-water separation and purification device for oilfield produced liquid can not only achieve the effect of ensuring that the oil-water mixture is fully purified, but also achieve the effect of promoting the centrifugation of the oil-water mixture and thus the oil-water stratification, and can also achieve the effect of conveniently collecting the separated and purified oil-water mixture. ;

[0016] The present invention provides an oil-water separation and purification device for oilfield produced fluid. It has the following beneficial effects: 1. The present invention starts the driving motor to drive the transmission worm to rotate. When the transmission worm rotates, it drives the rotating block to rotate. When the rotating block rotates, it drives the transmission rod to rotate. When the transmission rod rotates, it drives the push rod to slide, and finally achieves the purpose of avoiding the manual addition of too much high-concentration chemical agents at one time, thereby achieving the effect of ensuring that the oil-water mixture is fully purified.

[0017] 2. The present invention starts the driving motor to drive the transmission worm to rotate. When the transmission worm rotates, it drives the transmission worm wheel to rotate. When the transmission worm wheel rotates, it drives the first rotating column to rotate. When the first rotating column rotates, it drives the rotating plate to rotate, and finally achieves the purpose of high-speed stirring of the oil-water mixture inside the outer shell, thereby achieving the effect of promoting the centrifugation of the oil-water mixture and then the oil-water stratification, reducing the static stratification time.

[0018] 3. The present invention drives the first rotating column to rotate in the opposite direction by turning on the driving motor in the reverse direction, and then the ratchet clamps the ratchet wheel to fix the two. When the ratchet wheel rotates, it drives the ratchet to rotate, and when the ratchet rotates, it drives the rotating shaft to rotate synchronously, first collecting the lower water layer and then collecting the upper oil layer, so as to achieve the effect of conveniently collecting the separated and purified oil-water mixture.

[0019] 4. The integrated structure is simple to control. Only the motor rotation needs to be controlled to achieve the mixing and separation of produced fluids. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 A three-dimensional diagram of the external connection of an oilfield produced fluid oil-water separation and purification device proposed by the present invention; Figure 2 This is a schematic diagram of the internal structure of an oil-water separation and purification device for oilfield produced fluid proposed by the present invention; Figure 3 A schematic diagram of a limit block of an oil-water separation and purification device for oilfield produced fluid proposed by the present invention; Figure 4 A schematic diagram of a transmission worm gear of an oilfield produced fluid oil-water separation and purification device proposed by the present invention; Figure 5 A schematic diagram of a ratchet wheel of an oil-water separation and purification device for oilfield produced fluid proposed by the present invention; Figure 6A schematic diagram of a third rotating column of an oilfield produced fluid oil-water separation and purification device proposed by the present invention; Figure 7 This is a schematic diagram of the first transmission block of an oilfield produced fluid oil-water separation and purification device proposed by the present invention.

[0021] Among them, 1. shell; 2. upper baffle; 3. mounting plate; 4. driving motor; 5. transmission worm; 6. rotating block; 7. transmission rod; 8. limit block; 9. positioning block; 10. push rod; 11. discharge pipe; 12. chemical agent storage box; 13. transmission worm gear; 14. first rotating column; 15. rotating plate; 16. second rotating column; 17. transmission gear; 18. fixed rod; 19. first gear ring; 20. rotating roller; 21. ratchet; 22. third rotating column; 23. rotating shaft; 24. reset spring; 25. ratchet; 26. first transmission block; 27. upper fixed plate; 28. second gear ring; 29. ​​lower fixed plate; 30. column; 31. second transmission block; 32. third transmission block; 33. lower baffle. DETAILED DESCRIPTION

[0022] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings 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.

[0023] Please refer to the attached Figure 1 , Attachment Figure 2 , attached Figure 3 The embodiment of the present invention provides an oilfield produced liquid oil-water separation and purification device, comprising a shell 1, an upper baffle plate 2 is fixedly connected to the upper inner wall of the shell 1, a produced liquid inlet and a chemical agent inlet are arranged on the upper baffle plate 2, a mounting plate 3 is fixedly connected to the inside of the shell 1, a driving motor 4 is fixedly connected to the upper surface of the mounting plate 3, a transmission worm 5 is fixedly connected to the output end of the driving motor 4, a rotating block 6 is fixedly connected to the outer wall of the transmission worm 5, a transmission rod 7 is fixedly connected to the inside of the rotating block 6, a limiting block 8 is fixedly connected to the middle inner wall of the shell 1, a chemical agent storage box 12 is fixedly connected to the middle inner wall of the shell 1, a positioning block 9 is fixedly connected to the outer wall of the limiting block 8, a push rod 10 is slidably connected to the inner wall of the positioning block 9, the outer wall of the transmission rod 7 is rotatably connected to the inner wall of the push rod 10, a discharge pipe 11 is fixedly connected to the inside of the chemical agent storage box 12, the upper surface of the push rod 10 is arranged on the lower surface of the discharge pipe 11, and a rotating assembly is arranged on the outer wall of the transmission worm 5, and the rotating assembly is used to drive the rotating plate 15 to rotate; Specifically, a transparent observation window is provided on the surface of the shell 1 for observing the height of the oil production liquid inside the shell 1. The driving motor 4 is turned on to drive the transmission worm 5 to rotate. When the transmission worm 5 rotates, it will drive the rotating block 6 to rotate. When the rotating block 6 rotates, it will drive the transmission rod 7 to rotate. When the transmission rod 7 rotates, it will drive the push rod 10 to slide, and then the push rod 10 will be detached from the surface of the discharge pipe 11, and the chemicals in the chemical storage box 12 will flow out. At this time, the push rod 10 moves left and right cyclically, and the chemical storage box 12 automatically discharges materials at a fixed time and quantity, thereby finally achieving the purpose of avoiding the manual addition of too much high-concentration disinfectant at one time, thereby ensuring that the oil-water mixture is fully purified.

[0024] See attached Figure 4 The rotating assembly includes a transmission worm wheel 13, the outer wall of which is meshedly connected to the outer wall of the transmission worm 5, the interior of the transmission worm wheel 13 is fixedly connected to a first rotating column 14, and the upper outer wall of the first rotating column 14 is rotatably connected to the interior of the upper baffle 2; Specifically, the driving motor 4 is turned on to drive the transmission worm 5 to rotate. When the transmission worm 5 rotates, it drives the transmission worm wheel 13 to rotate. When the transmission worm wheel 13 rotates, it drives the first rotating column 14 to rotate.

[0025] See attached Figure 4 To Attachment Figure 7The lower outer wall of the first rotating column 14 is fixedly connected with a rotating plate 15, and the left and right inner walls of the rotating plate 15 are rotatably connected with the second rotating column 16; the middle outer wall of the second rotating column 16 is fixedly connected with a transmission gear 17, and the lower outer wall of the second rotating column 16 is fixedly connected with a roller 20, the middle inner wall of the outer shell 1 is fixedly connected with a fixing rod 18, the outer wall of the fixing rod 18 is fixedly connected with a first gear ring 19, and the outer wall of the transmission gear 17 is meshedly connected to the inner wall of the first gear ring 19; the lower surface of the first rotating column 14 is fixedly connected with a ratchet 21, and the outer wall of the ratchet 21 is meshedly connected with a ratchet 25; the lower surface of the ratchet 21 is provided with a third rotating column 22, the interior of the ratchet 21 is fixedly connected with a rotating shaft 23, and the interior of the third rotating column 22 is provided with a reset spring 24, the outer wall of the reset spring 24 is fixedly connected to the interior of the ratchet 25, and the inner wall of the ratchet 25 is rotatably connected to the outer wall of the rotating shaft 23 ; A lower baffle plate 33 is fixedly connected to the inner wall of the lower side of the housing 1, and a lower fixed plate 29 is fixedly connected to the upper surface of the lower baffle plate 33. A second gear ring 28 is provided on the upper surface of the lower fixed plate 29, and an upper fixed plate 27 is provided on the upper surface of the second gear ring 28; a third transmission block 32 is fixedly connected to the upper surface of the lower fixed plate 29, and the first transmission block 26 is rotatably connected to the inner wall of the lower fixed plate 29, and a column 30 is fixedly connected to the upper surface of the lower fixed plate 29; an outer wall of the column 30 is arranged inside the upper fixed plate 27, and an outer wall of the third transmission block 32 is meshedly connected to the second transmission block 31; an outer wall of the second transmission block 31 is meshedly connected to the inner wall of the second gear ring 28, and the lower surface of the second transmission block 31 is arranged on the upper surface of the lower fixed plate 29, an upper outer wall of the first transmission block 26 is rotatably connected to the inner wall of the upper fixed plate 27, and a middle outer wall of the first transmission block 26 is meshedly connected to the inner wall of the second gear ring 28; Specifically, when the first rotating column 14 rotates, it will drive the rotating plate 15 to rotate. When the rotating plate 15 rotates, it will drive the second rotating column 16 to rotate. When the second rotating column 16 rotates, it will drive the transmission gear 17 to rotate. When the transmission gear 17 rotates, it will drive the second rotating column 16 to rotate. When the second rotating column 16 rotates, it will drive the roller 20 to rotate, and finally achieve the purpose of high-speed stirring of the oil-water mixture inside the shell 1, so as to achieve the effect of centrifuging the oil-water mixture and then stratifying the oil and water. After the oil and water are allowed to stand and stratify, the drive motor 4 is turned on in the reverse direction to drive the first rotating column 14 to rotate in the reverse direction, and then the ratchet 25 clamps the ratchet wheel 21 to fix the two. When the ratchet 21 rotates, it will drive the ratchet 25 to rotate. When the ratchet 25 rotates, it will drive the shaft 23 to rotate synchronously. Then, the third rotating column 22 will rotate along with the rotation of the shaft 23. When the third rotating column 22 rotates, it will drive the first transmission block 26 to rotate. When the first transmission block 26 rotates, it will drive the second gear ring 28 to rotate. When the second gear ring 28 rotates, it will drive the second transmission block 31 to rotate. At the same time, the second transmission block 31 opens to discharge the stratified oil-water mixture through the drainage hole inside the lower baffle 33. The water layer on the lower layer is collected first, and then the oil layer on the upper side is collected. This can achieve the effect of conveniently collecting the separated and purified oil-water mixture.

[0026] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An oilfield produced liquid oil-water separation and purification device, comprising a housing (1) and a control system, wherein an upper baffle (2) is fixedly connected to the upper inner wall of the housing (1), and a produced liquid inlet and a chemical agent inlet are provided on the upper baffle (2), and the control system controls the produced liquid and chemical agent injection amount of the device and the forward and reverse rotation of the drive motor, characterized in that: The housing (1) is fixedly connected to a mounting plate (3) inside, the mounting plate (3) is fixedly connected to a drive motor (4) on its upper surface, the drive motor (4) is fixedly connected to a transmission worm (5) at its output end, the transmission worm (5) is fixedly connected to a rotating block (6) on its outer wall, the rotating block (6) is fixedly connected to a transmission rod (7) inside, the housing (1) is fixedly connected to a limit block (8) on its middle inner wall, and the housing (1) is fixedly connected to a chemical agent storage box (1). 2), the outer wall of the limit block (8) is fixedly connected to a positioning block (9), the inner wall of the positioning block (9) is slidably connected to a push rod (10), the outer wall of the transmission rod (7) is rotatably connected to the inner wall of the push rod (10), the interior of the chemical agent storage box (12) is fixedly connected to a discharge pipe (11), the upper surface of the push rod (10) is arranged on the lower surface of the discharge pipe (11), and the outer wall of the transmission worm (5) is provided with a rotating assembly, and the rotating assembly is used to drive the rotating plate (15) to rotate.

2. The oil-water separation and purification device for oilfield produced fluid according to claim 1, characterized in that: The rotating assembly comprises a transmission worm wheel (13), the outer wall of which is meshingly connected to the outer wall of the transmission worm (5), the interior of which is fixedly connected to a first rotating column (14), and the upper outer wall of which is rotatably connected to the interior of the upper baffle (2).

3. The oil-water separation and purification device for oilfield produced fluid according to claim 2, characterized in that: A rotating plate (15) is fixedly connected to the lower outer wall of the first rotating column (14), and second rotating columns (16) are rotatably connected to the left and right inner walls of the rotating plate (15).

4. The oil-water separation and purification device for oilfield produced fluid according to claim 3, characterized in that: A transmission gear (17) is fixedly connected to the middle outer wall of the second rotating column (16), a roller (20) is fixedly connected to the lower outer wall of the second rotating column (16), a fixing rod (18) is fixedly connected to the middle inner wall of the housing (1), the outer wall of the fixing rod (18) is fixedly connected to the first gear ring (19), and the outer wall of the transmission gear (17) is meshingly connected to the inner wall of the first gear ring (19).

5. The oil-water separation and purification device for oilfield produced fluid according to claim 2, characterized in that: A ratchet (21) is fixedly connected to the lower surface of the first rotating column (14), and ratchet teeth (25) are meshingly connected to the outer wall of the ratchet (21).

6. The oil-water separation and purification device for oilfield produced fluid according to claim 5, characterized in that: A third rotating column (22) is arranged on the lower surface of the ratchet (21); a rotating shaft (23) is fixedly connected inside the ratchet (21); a return spring (24) is arranged inside the third rotating column (22); an outer wall of the return spring (24) is fixedly connected inside the ratchet (25); and an inner wall of the ratchet (25) is rotatably connected to the outer wall of the rotating shaft (23).

7. The oil-water separation and purification device for oilfield produced fluid according to claim 1, characterized in that: A lower baffle (33) is fixedly connected to the lower inner wall of the housing (1); a lower fixing plate (29) is fixedly connected to the upper surface of the lower baffle (33); a second toothed ring (28) is provided on the upper surface of the lower fixing plate (29); and an upper fixing plate (27) is provided on the upper surface of the second toothed ring (28).

8. The oil-water separation and purification device for oilfield produced fluid according to claim 7, characterized in that: The upper surface of the lower fixed plate (29) is fixedly connected to a third transmission block (32), the inner wall of the lower fixed plate (29) is rotatably connected to the first transmission block (26), and the upper surface of the lower fixed plate (29) is fixedly connected to a column (30).

9. The oil-water separation and purification device for oilfield produced fluid according to claim 8, characterized in that: The outer wall of the column (30) is arranged inside the upper fixed plate (27), and the outer wall of the third transmission block (32) is meshingly connected with the second transmission block (31).

10. The oil-water separation and purification device for oilfield produced fluid according to claim 9, characterized in that: The outer wall of the second transmission block (31) is meshedly connected to the inner wall of the second gear ring (28); the lower surface of the second transmission block (31) is arranged on the upper surface of the lower fixed plate (29); the upper outer wall of the first transmission block (26) is rotatably connected to the inner wall of the upper fixed plate (27); and the middle outer wall of the first transmission block (26) is meshedly connected to the inner wall of the second gear ring (28).

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