Microbial enzymolysis device for organic fertilizer production

By designing a microbial enzymatic hydrolysis device, the problem of low automation in organic fertilizer production was solved, achieving efficient material stacking and turning processes, as well as temperature control, thereby improving production efficiency.

CN116178064BActive Publication Date: 2025-11-25SUQIAN WOLVBAO ORGANIC AGRI DEV
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Patent Information

Application Number
CN202310311937.X
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2023-03-28
Publication Date
2025-11-25
Estimated Expiration
2043-03-28

AI Technical Summary

Technical Problem

The current microbial enzymatic hydrolysis process in organic fertilizer production has a low degree of automation, and the efficiency of multi-stage strip stacking and temperature control is low, requiring multiple pieces of equipment to work together.

Method used

Design a microbial enzymatic hydrolysis device, including vertical and horizontal support frames, and realize automated multi-channel circular material stacking, turning and temperature control through components such as mixing tank, connecting pipe, feeding cylinder, screw feeding assembly, turning mechanism and air outlet pipe.

Benefits of technology

It automates the microbial enzymatic hydrolysis process, improves the efficiency of stacking and turning materials, and can quickly adjust the temperature of the material pile, thereby increasing production efficiency and automation.

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Abstract

The application provides a microbial enzymolysis device for organic fertilizer production, which comprises a vertical support frame and a horizontal support frame, the horizontal support frame is rotationally connected in the vertical support frame through an annular guide rail, an inner top of the vertical support frame is fixedly connected with a mixing tank, a bottom discharge pipe of the mixing tank is connected with a rotatable connecting pipe in a butt joint mode, a left bottom of the horizontal support frame is fixedly connected with a horizontally arranged discharging cylinder, a discharging end of the connecting pipe is connected with a left end of the discharging cylinder in a butt joint mode, a spiral feeding assembly is installed in the discharging cylinder, a plurality of discharging pipes are fixedly connected with the bottom of the discharging cylinder along the feeding direction of the discharging cylinder, a liftable top plate is installed on the right bottom of the horizontal support frame, and a plurality of pairs of arc-shaped material blocking plates are fixedly connected with the bottom of the top plate. The device can continuously complete the stacking process of multiple circular material piles while mixing, and can automatically complete the turning and temperature control processes.
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Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of organic fertilizer production, and particularly relates to a microbial enzymolysis device for organic fertilizer production. BACKGROUND

[0002] The nutrient elements contained in the organic fertilizer are in an organic state, and crops are difficult to directly utilize. After microbial enzymolysis, various nutrient elements are slowly released, and nutrients are continuously supplied to crops. The application of the organic fertilizer can improve the soil structure, effectively coordinate water, fertilizer, air and heat in the soil, and improve the soil fertility and land productivity.

[0003] The microbial enzymolysis process needs to mix raw materials with microorganisms by stirring, and then stack and perform enzymolysis fermentation. However, at present, the raw materials need to be mixed by using a stirring tank, and then the materials need to be stacked in a strip shape by using a forklift, and the materials need to be turned over by using a turning machine for multiple times during the stacking process. In addition, the composting temperature needs to be controlled during the process. Therefore, multiple devices are needed to complete the microbial enzymolysis fermentation process, and the degree of automation is low, and the efficiency of the multiple strip stacking process is low. SUMMARY

[0004] In view of the above problems, the present application provides a microbial enzymolysis device for organic fertilizer production. The device can continuously complete the stacking process of multiple circular material piles while mixing materials, and can automatically complete the turning and temperature control processes.

[0005] To solve the above problems, the technical scheme adopted by the present application is as follows:

[0006] A microbial enzymolysis device for organic fertilizer production, comprising a vertical support frame and a horizontal support frame, the horizontal support frame is rotationally connected in the vertical support frame through an annular guide rail, the inner top of the vertical support frame is fixedly connected with a mixing tank, the bottom discharge pipe of the mixing tank is connected with a rotatable connecting pipe, the left bottom of the horizontal support frame is fixedly connected with a horizontally arranged discharge cylinder, the discharge end of the connecting pipe is connected with the left end of the discharge cylinder, a spiral feeding assembly is installed in the discharge cylinder, and the bottom of the discharge cylinder is fixedly connected with a plurality of discharge pipes along the feeding direction of the discharge cylinder, a liftable top plate is installed on the right bottom of the horizontal support frame, the bottom of the top plate is fixedly connected with a plurality of pairs of arc-shaped material blocking plates, the plurality of pairs of arc-shaped material blocking plates correspond to the plurality of discharge pipes one by one, a turning mechanism is installed in each of the plurality of pairs of arc-shaped material blocking plates, and a plurality of upward and downward movable gas discharge pipes are further installed on the top plate.

[0007] Preferably, a stirring shaft extending into the mixing tank is rotationally connected to the top of the vertical support frame, a plurality of groups of stirring plates are fixedly connected to the side wall of the stirring shaft, a first motor is fixedly connected to the top of the vertical support frame, and the output shaft of the first motor is drivingly connected with the stirring shaft through a pair of gears.

[0008] Preferably, the inside of the vertical support frame is fixedly connected with a horizontally arranged support plate, a second motor is installed on the support plate, chain wheels are fixedly connected to the output end of the second motor and the feeding end of the connecting pipe, and chains are sleeved on the two chain wheels.

[0009] Preferably, the spiral feeding assembly comprises a rotating rod rotatably connected in the feeding cylinder, and a spiral conveying blade is fixedly connected to the rotating rod.

[0010] Preferably, the right bottom of the horizontal support frame is fixedly connected with a first electric telescopic rod, and the telescopic end of the first electric telescopic rod is fixedly connected with the top plate.

[0011] Preferably, the right top of the horizontal support frame is fixedly connected with a second electric telescopic rod, a horizontally arranged connecting pipe is fixedly connected to the telescopic end of the second electric telescopic rod, and the upper ends of the plurality of air outlet pipes are connected with the connecting pipe.

[0012] Preferably, the inner wall of the annular guide rail is fixedly connected with an annular conductive rail, one end of the horizontal support frame is fixedly connected with a conductive head in contact with the annular conductive rail, a wireless controller electrically connected with the conductive head is installed on the horizontal support frame, and the wireless controller is electrically connected with the third motor, the first electric telescopic rod and the second electric telescopic rod.

[0013] Preferably, the lower end of the air outlet pipe extends to between a pair of arc-shaped material blocking plates, a plurality of air outlet holes are uniformly distributed on the side wall of the air outlet pipe, the stirring shaft is a hollow shaft, the lower end of the stirring shaft penetrates through the connecting pipe, and the upper and lower ends of the stirring shaft are respectively connected with the air inlet pipe and the connecting pipe through rotary joints.

[0014] Preferably, the material turning mechanism comprises a rotating shaft rotatably connected on the plurality of pairs of arc-shaped material blocking plates, a plurality of material turning plates are fixedly connected to the circumferential side wall between the plurality of pairs of arc-shaped material blocking plates, and the left end of the rotating shaft is in transmission with the right end of the rotating rod through a transmission assembly.

[0015] Preferably, the transmission assembly comprises a sleeve rotatably connected on the left end of the top plate, an extension shaft is arranged in the sleeve, a plurality of limiting strips matched with the sleeve are fixedly connected to the side wall of the extension shaft, a fixed plate is fixedly connected to the right end of the feeding cylinder, the extension shaft is rotatably connected to the fixed plate, the right end of the rotating rod is in transmission with the upper end of the extension shaft through a pair of first bevel gears, and the left end of the rotating shaft is in transmission with the bottom end of the sleeve through a pair of second bevel gears.

[0016] The beneficial effects of the present application are:

[0017] 1. By setting the mixing tank, the circumferentially rotatable connecting pipe and the discharging cylinder, the microorganisms and raw materials are put into the mixing tank, the stirring and mixing process is realized through multiple stirring plates, after mixing, the connecting pipe enters the discharging pipe, the material is conveyed through the spiral feeding assembly, and then falls through multiple discharging pipes, the second motor is started, the connecting pipe and the discharging cylinder are driven to rotate circumferentially through the sprocket and the chain, and the stacking process of multiple circular material piles is automatically completed, and the stacking efficiency is high.

[0018] 2. When periodic turning is needed, the first electric telescopic rod is started to drive the top plate to descend, multiple pairs of arc-shaped material blocking plates are correspondingly horizontally crossed over multiple circular material piles, the spiral feeding assembly is rotated, the transmission assembly drives the rotating shaft to rotate, multiple turning plates are driven to rotate, and the turning process of multiple circular material piles is completed through the circumferential rotation of the horizontal support frame.

[0019] 3. By installing multiple air outlet pipes, the stacking temperature can be used, the air inlet pipe is connected to the fan, the fan can convey normal temperature gas or heated gas, the second electric telescopic rod is started to drive multiple air outlet pipes to descend and insert into the middle part of multiple material piles, normal temperature gas or hot gas enters the communication pipe through the hollow shaft, then enters multiple air outlet pipes, and finally blows out to the surrounding through multiple air outlet holes, and the temperature of the material pile is quickly adjusted from the inside through the circumferential rotation. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 It is a structural schematic diagram of the present application;

[0021] Figure 2 It is an enlarged schematic diagram of structure A in Figure 1

[0022] Figure 3 It is a top view of the sleeve and the extension shaft proposed by the present application;

[0023] Figure 4 It is a top view of the top plate proposed by the present application;

[0024] Figure 5 It is a top view of the ring-shaped guide rail proposed by the present application;

[0025] Figure 6 It is a temperature control state diagram of the present application;

[0026] Figure 7 It is a turning state diagram of the present application.

[0027] ​In the figure: 1 vertical support frame, 2 horizontal support frame, 3 mixing tank, 4 stirring plate, 5 stirring shaft, 6 second motor, 7 chain wheel, 8 chain, 9 gear, 10 first motor, 11 air inlet pipe, 12 connecting pipe, 13 third motor, 14 discharging cylinder, 15 rotating rod, 16 spiral conveying blade, 17 discharging pipe, 18 second electric telescopic rod, 19 communication pipe, 20 first electric telescopic rod, 21 air outlet pipe, 22 wireless controller, 23 conductive head, 24 annular guide rail, 25 annular conductive rail, 26 top plate, 27 arc-shaped material blocking plate, 28 rotating shaft, 29 material turning plate, 30 air outlet pipe, 31 first bevel gear, 32 second bevel gear, 33 sleeve, 34 extension shaft, 35 support plate, 36 limiting strip. Embodiment

[0028] In order to make the above objectives, features and advantages of the present application more obvious and easy to understand, the specific embodiments of the present application will be described in detail below with reference to the drawings. In the following description, a large number of specific details are set forth in order to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the spirit of the present application, so the present application is not limited to the specific embodiments disclosed below.

[0029] It should be noted that when an element is referred to as being "fixed" to another element, it can be directly on the other element or there can be an intervening element. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or there can be an intervening element. The terms "vertical", "horizontal", "left", "right", and similar expressions used herein are for illustrative purposes only and are not intended to be the only implementation.

[0030] Reference Figures 1-7 A microbial enzymolysis device for producing organic fertilizer, comprising a vertical support frame 1 and a horizontal support frame 2, the horizontal support frame 2 is rotationally connected in the vertical support frame 1 through an annular guide rail 24, the inner top of the vertical support frame 1 is fixedly connected with a mixing tank 3, the top of the vertical support frame 1 is rotationally connected with a stirring shaft 5 extending into the mixing tank 3, the side wall of the stirring shaft 5 is fixedly connected with a plurality of stirring plates 4, the top of the vertical support frame 1 is fixedly connected with a first motor 10, the output shaft of the first motor 10 is drivingly connected with the stirring shaft 5 through a pair of gears 9, starting the first motor 10 drives the stirring shaft 5 to rotate through the pair of gears 9, and then drives the plurality of stirring plates 4 to realize the stirring and mixing process.

[0031] The bottom discharge pipe of the mixing tank 3 is connected with a rotatable connecting pipe 12, the inside of the vertical support frame 1 is fixedly connected with a horizontally arranged support plate 35, the support plate 35 is provided with a second motor 6, the output end of the second motor 6 is fixedly connected with a chain wheel 7 at the feeding end of the connecting pipe 12, two chain wheels 7 are sleeved with a chain 8, the second motor 6 is started, the connecting pipe 12 and the discharge cylinder 14 can be driven to rotate by the chain wheel 7 and the chain 8, and the stacking process of multiple circular material piles is automatically completed.

[0032] The left bottom of the horizontal support frame 2 is fixedly connected with a horizontally arranged discharge cylinder 14, the left end of the discharge end of the connecting pipe 12 is connected with the left end of the discharge cylinder 14, the discharge cylinder 14 is provided with a spiral feeding assembly, the bottom of the discharge cylinder 14 is fixedly communicated with a plurality of discharge pipes 17 along the feeding direction, the spiral feeding assembly comprises a rotating rod 15 rotatably connected in the discharge cylinder 14, the rotating rod 15 is fixedly connected with a spiral conveying blade 16, the left end of the discharge cylinder 14 is provided with a third motor 13 capable of driving the rotating rod 15 to rotate, the third motor 13 is started to drive the rotating rod 15 to rotate, the spiral conveying blade 16 is driven to rotate, the material is conveyed, and then falls through the plurality of discharge pipes 17.

[0033] The right bottom of the horizontal support frame 2 is provided with a liftable top plate 26, the bottom of the top plate 26 is fixedly connected with a plurality of pairs of arc-shaped material blocking plates 27, the plurality of pairs of arc-shaped material blocking plates 27 correspond to the plurality of discharge pipes 17 one by one, the right bottom of the horizontal support frame 2 is fixedly connected with a first electric telescopic rod 20, the telescopic end of the first electric telescopic rod 20 is fixedly connected with the top plate 26, and one pair of arc-shaped material blocking plates 27 can span the material pile to limit the scattering direction of the material in the material turning process.

[0034] The plurality of pairs of arc-shaped material blocking plates 27 are provided with a material turning mechanism, the material turning mechanism comprises a rotating shaft 28 rotatably connected on the plurality of pairs of arc-shaped material blocking plates 27, a plurality of material turning plates 29 are fixedly connected on the one section of the circumferential side wall between the plurality of pairs of arc-shaped material blocking plates 27, the left side end of the rotating shaft 28 and the right side end of the rotating rod 15 are in transmission through a transmission assembly, the transmission assembly comprises a sleeve 33 rotatably connected on the left side end of the top plate 26, the sleeve 33 is provided with an extension shaft 34, the side wall of the extension shaft 34 is fixedly connected with a plurality of limiting strips 36 matched with the sleeve 33, the right side end of the discharge cylinder 14 is fixedly connected with a fixed plate, the extension shaft 34 is rotatably connected on the fixed plate, the right side end of the rotating rod 15 and the upper end of the extension shaft 34 are in transmission connection through a pair of first bevel gears 31, the left side end of the rotating shaft 28 and the bottom end of the sleeve 33 are in transmission connection through a pair of second bevel gears 32, the rotating rod 15 is rotated at the same time to drive the rotating shaft 28 to rotate through the transmission assembly, and then drive the plurality of material turning plates 29 to rotate, and then cooperate with the circumferential rotation of the horizontal support frame 2 to complete the material turning process of the multiple circular material piles.

[0035] A plurality of gas outlet pipes 21 movably installed on the top plate 26, the right side of the horizontal support frame 2 is fixedly connected with a second electric telescopic rod 18, the telescopic end of the second electric telescopic rod 18 is fixedly connected with a horizontally arranged communication pipe 19, the upper ends of the plurality of gas outlet pipes 21 are connected with the communication pipe 19, the lower ends of the gas outlet pipes 21 extend between a pair of arc-shaped material blocking plates 27, the side walls of the gas outlet pipes 21 are uniformly provided with a plurality of gas outlet holes 30, the stirring shaft 5 is a hollow shaft, the lower end of the stirring shaft 5 penetrates the connecting pipe 12, the upper and lower ends of the stirring shaft 5 are respectively connected with the air inlet pipe 11 and the communication pipe 19 through rotary joints, the normal temperature gas or hot gas enters the communication pipe 19 through the hollow shaft, then enters the plurality of gas outlet pipes 21, and finally is blown out to the surrounding through the plurality of gas outlet holes 30.

[0036] The inner wall of the annular guide rail 24 is fixedly connected with an annular conductive rail 25, one end of the horizontal support frame 2 is fixedly connected with a conductive head 23 in contact with the annular conductive rail 25, the horizontal support frame 2 is provided with a wireless controller 22 electrically connected with the conductive head 23, the wireless controller 22 is electrically connected with the third motor 13, the first electric telescopic rod 20 and the second electric telescopic rod 18, and the wireless controller 22 can realize wireless remote control and ensure power supply through the annular conductive rail 25 and the conductive head 23 in the rotating state.

[0037] The microorganisms and raw materials are put into the mixing tank 3, the first motor 10 is started, the stirring shaft 5 is driven to rotate through the pair of gears 9, a plurality of stirring plates 4 are driven to realize the stirring and mixing process, the mixture enters the discharging cylinder 14 through the connecting pipe 12 after mixing, the third motor 13 is started to drive the rotating rod 15 to rotate, the spiral conveying blade 16 is driven to rotate, the material is conveyed, and then falls through the plurality of discharging pipes 17, it is worth noting that since the left end of the discharging pipe 17 is close to the feeding end, the diameters of the plurality of discharging pipes 17 are consistent, and then the discharging amounts of the plurality of discharging pipes 17 from left to right decrease in turn, which is suitable for the decreasing circumferences of the plurality of circular material piles from outside to inside, the second motor 6 is started, and the connecting pipe 12 and the discharging cylinder 14 can be driven to rotate in a circle through the sprocket 7 and the chain 8, so that the stacking process of the plurality of circular material piles is automatically completed, and the stacking efficiency is high.

[0038] When regular turning is needed, the first electric telescopic rod 20 is started to drive the top plate 26 to descend, a plurality of pairs of arc-shaped material blocking plates 27 are correspondingly horizontally arranged across the plurality of circular material piles, the extension shaft 34 is driven to rotate through the pair of first bevel gears 31 while the spiral feeding assembly is rotating, the extension shaft 34 and the sleeve 33 are slidably connected through the plurality of limiting strips 36, the rotating shaft 28 is driven to rotate through the sleeve 33 and the second bevel gear 32, a plurality of turning plates 29 are driven to rotate, and the horizontal support frame 2 is circumferentially rotated to complete the turning process of the plurality of circular material piles.

[0039] During the composting process, the temperature is controlled by connecting the air inlet pipe 11 to the air blower. The air blower can deliver normal temperature gas or heated gas. When the composting temperature is too high, normal temperature gas is delivered. When the composting temperature is lower, heated gas is delivered. The second electric telescopic rod 18 is started to drive the multiple air outlet pipes 21 to descend and insert into the middle part of the multiple piles. The normal temperature gas or the hot gas enters the communication pipe 19 through the hollow shaft, and then enters the multiple air outlet pipes 21, and finally blows out through the multiple air outlet holes 30 to the surrounding. By rotating circumferentially, the temperature of the pile can be quickly adjusted from the inside.

[0040] The above only describes the preferred embodiments of the present application and is not intended to limit the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A microbial enzymatic hydrolysis device for organic fertilizer production, comprising a vertical support frame (1) and a horizontal support frame (2), characterized in that, The horizontal support frame (2) is rotatably connected to the vertical support frame (1) via an annular guide rail (24). A mixing tank (3) is fixedly connected to the top inner part of the vertical support frame (1). A rotatable connecting pipe (12) is connected to the bottom discharge pipe of the mixing tank (3). A horizontally arranged feeding cylinder (14) is fixedly connected to the bottom left side of the horizontal support frame (2). The feeding end of the connecting pipe (12) is connected to the left end of the feeding cylinder (14). A screw feeder is installed inside the feeding cylinder (14). The bottom of the feeding cylinder (14) is fixedly connected to multiple feeding pipes (17) along its feeding direction. The bottom right side of the horizontal support frame (2) is equipped with a liftable top plate (26). The bottom of the top plate (26) is fixedly connected to multiple pairs of arc-shaped baffles (27). The multiple pairs of arc-shaped baffles (27) correspond one-to-one with the multiple feeding pipes (17). Each pair of arc-shaped baffles (27) is equipped with a turning mechanism. The top plate (26) is also equipped with multiple air outlet pipes (21) that can move up and down.

2. The microbial enzymatic hydrolysis device for organic fertilizer production according to claim 1, characterized in that, The top of the vertical support frame (1) is rotatably connected to a stirring shaft (5) extending into the mixing tank (3). Multiple stirring plates (4) are fixedly connected to the side wall of the stirring shaft (5). The top of the vertical support frame (1) is fixedly connected to a first motor (10). The output shaft of the first motor (10) is connected to the stirring shaft (5) by a pair of gears (9).

3. The microbial enzymatic hydrolysis device for organic fertilizer production according to claim 2, characterized in that, The vertical support frame (1) is internally fixedly connected to a horizontally arranged support plate (35). A second motor (6) is installed on the support plate (35). A sprocket (7) is fixedly connected to both the output end of the second motor (6) and the feed end of the connecting pipe (12). A chain (8) is sleeved on the two sprockets (7).

4. The microbial enzymatic hydrolysis device for organic fertilizer production according to claim 3, characterized in that, The spiral feeding assembly includes a rotating rod (15) rotatably connected inside the feed cylinder (14), a spiral conveying blade (16) fixedly connected to the rotating rod (15), and a third motor (13) that can drive the rotating rod (15) to rotate is installed at the left end of the feed cylinder (14).

5. The microbial enzymatic hydrolysis device for organic fertilizer production according to claim 4, characterized in that, The bottom right side of the horizontal support frame (2) is fixedly connected to a first electric telescopic rod (20), and the telescopic end of the first electric telescopic rod (20) is fixedly connected to the top plate (26).

6. The microbial enzymatic hydrolysis device for organic fertilizer production according to claim 5, characterized in that, The top right side of the horizontal support frame (2) is fixedly connected to a second electric telescopic rod (18), and the telescopic end of the second electric telescopic rod (18) is fixedly connected to a horizontally arranged connecting pipe (19). The upper ends of the multiple vertically movable air outlet pipes (21) are all connected to the connecting pipe (19).

7. The microbial enzymatic hydrolysis device for organic fertilizer production according to claim 6, characterized in that, The inner wall of the annular guide rail (24) is fixedly connected to an annular conductive rail (25). One end of the horizontal support frame (2) is fixedly connected to a conductive head (23) that abuts against the annular conductive rail (25). A wireless controller (22) that is electrically connected to the conductive head (23) is installed on the horizontal support frame (2). The wireless controller (22) is electrically connected to the third motor (13), the first electric telescopic rod (20), and the second electric telescopic rod (18).

8. The microbial enzymatic hydrolysis device for organic fertilizer production according to claim 6, characterized in that, The lower end of the air outlet pipe (21) extends between a pair of arc-shaped baffles (27). The side wall of the air outlet pipe (21) is evenly distributed with multiple air outlet holes (30). The stirring shaft (5) is a hollow shaft. The lower end of the stirring shaft (5) passes through the connecting pipe (12). The upper and lower ends of the stirring shaft (5) are respectively connected to the air inlet pipe (11) and the connecting pipe (19) through rotary joints.

9. A microbial enzymatic hydrolysis device for organic fertilizer production according to claim 1, characterized in that, The material turning mechanism includes a rotating shaft (28) rotatably connected to multiple pairs of arc-shaped baffles (27). Multiple material turning plates (29) are fixedly connected to a section of the circumferential sidewall of the rotating shaft (28) between the multiple pairs of arc-shaped baffles (27). The left end of the rotating shaft (28) and the right end of the rotating rod (15) are connected by a transmission assembly.

10. A microbial enzymatic hydrolysis device for organic fertilizer production according to claim 9, characterized in that, The transmission assembly includes a sleeve (33) rotatably connected to the left end of the top plate (26), an extension shaft (34) is provided inside the sleeve (33), and multiple limiting strips (36) adapted to the sleeve (33) are fixedly connected to the side wall of the extension shaft (34). A fixing plate is fixedly connected to the right end of the feed cylinder (14), and the extension shaft (34) is rotatably connected to the fixing plate. The right end of the rotating rod (15) is connected to the upper end of the extension shaft (34) through a pair of first bevel gears (31). The left end of the rotating shaft (28) is connected to the bottom end of the sleeve (33) through a pair of second bevel gears (32).

Citation Information

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