Threshing device for corn processing based on extrusion

Abstract

The present application relates to the technical field of corn threshing device, specifically, it relates to the threshing device for corn processing based on extrusion. It comprises a casing and a smoke dust cover arranged on the upper surface of the casing, a threshing roller is arranged in the smoke dust cover, a screening device is arranged on the support at the bottom of the casing, a driving device for driving the screening device and the threshing roller is further arranged on the support above the screening device, a heater for drying corn cobs is arranged at the front end of the casing, a guide part is arranged at the rear end of the casing, and the extrusion part arranged on the threshing roller extrudes corn when the threshing roller threshes. When the piston plate moves outward, the gas in the liquid storage box instantaneously pushes the piston plate to move at this time, the gas pushes the plurality of extrusion strips to extrude the corn, and the extrusion of the arc ring is matched, so that the extrusion strip is matched with the shape of the corn, so as to improve the effect of corn threshing and reduce the strength of manual operation.

Description

Technical Field

[0001] This invention relates to the field of corn threshing equipment technology, and more specifically, to a corn threshing device based on extrusion. Background Technology

[0002] The function of a corn thresher is to thresh the dried corn ears. Most are axial-flow drum type, but vertical threshing disc type also exists. Because of its high production efficiency, good threshing quality, simple operation, simple structure, durability, reliable operation, and convenient use and maintenance, it has been popular with farmers for many years.

[0003] There are many existing technologies for corn threshers, such as:

[0004] Chinese Patent Publication No. CN111034474B discloses a corn thresher, including a frame, a threshing chamber, a toothed roller disposed inside the threshing chamber, and a first motor for driving the toothed roller to rotate. The threshing chamber is provided with a feed inlet and a discharge inlet. Below the discharge inlet, a material compression device and a dust collection device are provided. The dust collection device includes two lateral pull plates arranged opposite each other, a telescopic air bladder disposed between the two lateral pull plates, one-way feed and discharge valves distributed on the upper end face of the telescopic air bladder, several dust collection pipes connected to the lower end face of the telescopic air bladder, and one-way discharge valves disposed on the dust collection pipes. A heating air inlet pipe is also connected to the telescopic air bladder, and a one-way air inlet valve is disposed on the heating air inlet pipe. The first motor drives the two lateral pull plates to perform relative reciprocating motion through a first power component. The material compression device includes a pull-out component that reciprocates synchronously with the lateral pull plates to disperse the material falling on them.

[0005] Therefore, existing corn threshing devices often use a toothed roller to thresh the corn kernels. The toothed roller strikes the corn kernels, thus removing them. However, this method is only suitable for relatively dry corn. When the corn is wet, and the ends (i.e., the silks) are usually conical, the kernels at the ends are smaller than those in the middle of the corn cob. During threshing, the toothed roller does not easily contact the kernels at the ends, resulting in a small number of unthreshed kernels remaining. This requires manual threshing later, which affects efficiency. Summary of the Invention

[0006] The purpose of this invention is to provide a corn threshing device based on extrusion to solve the problems mentioned in the background art.

[0007] To achieve the above objectives, the present invention provides a corn threshing device based on extrusion, comprising a casing and a dust hood disposed on the upper surface of the casing. A threshing roller is disposed inside the dust hood. A screening device is disposed on a support at the bottom of the casing, and a drive device for driving the screening device and the threshing roller is disposed on a support above the screening device. A heater for drying corn cobs is disposed at the front end of the casing, and a guide part is disposed at the rear end of the casing. When the threshing roller is threshing, the extrusion part disposed on the threshing roller extrudes the corn. The guide part guides the dust generated during the threshing process, and the guided dust is filtered and purified through the guide part. The dust is then transported to a transfer box disposed on one side of the support. The transfer box is connected to the inside of the casing so that the purified hot air can be recycled.

[0008] As a further improvement to this technical solution, the extrusion section includes an electric hydraulic cylinder and an arc-shaped ring. The electric hydraulic cylinder is symmetrically arranged on the dust hood, and the telescopic rod of the electric hydraulic cylinder passes through the dust hood and is fixedly connected to the arc-shaped ring. The arc-shaped ring is used to extrude corn.

[0009] As a further improvement to this technical solution, the guide section includes an air duct box and a fan. The fan is installed inside the adapter cylinder that is fixedly connected to the adapter box. The two ends of the air duct box are detachably connected to the adapter cylinder and the housing. The bottom of the adapter cylinder is connected to an external air pipe. The external air pipe passes through the adapter box. A filter plate is installed inside the end of the air duct box.

[0010] As a further improvement to this technical solution, the air inside the adapter box is transported through an air pipe connected to the air hole at the end of the adapter box. The end of the air pipe passes through the housing and connects to the exhaust box installed inside the housing. The exhaust hole of the exhaust box is inclined and tilts towards the exhaust end of the housing.

[0011] As a further improvement to this technical solution, the extrusion section also includes a plurality of extrusion strips disposed in the inner cavity of the arc-shaped ring, each of the extrusion strips being fixedly connected to an elastic rope, the end of which is fixedly connected to the inner wall of the cavity.

[0012] As a further improvement to this technical solution, an inner air tube is fitted inside the outer air tube, and the inner air tube is fixedly connected to a movable plate. The upper and lower ends of the movable plate are provided with sliders, which are slidably connected to a groove opened in the adapter box. A baffle that is slidably connected to the adapter box is provided on the outside of the adapter box. Under normal conditions, the baffle is in a closed state.

[0013] As a further improvement to this technical solution, the movable plate is pushed inward by air, and during the movement, the movable plate abuts against the top rod of the sliding connection adapter box. The end of the top rod is fixedly connected to a piston plate, and the piston plate is sleeved and fitted into the piston cavity formed inside the adapter box.

[0014] As a further improvement to this technical solution, the piston plate is fixedly connected to the return spring on the opposite side of the top rod, the piezoelectric ceramic ring provided on the inner wall of the piston cavity is in contact with the return spring, the piezoelectric ceramic ring is electrically connected to a heating resistor through a wire, the liquid storage box connected to the piston cavity is fixedly connected to the adapter box, the heating resistor is located inside the liquid storage box, and a pressure valve is provided at the connection between the piston cavity and the liquid storage box, and a cooling device is provided on the top of the liquid storage box.

[0015] As a further improvement to this technical solution, the air supply pipe connected to the outside of the adapter box has one end connected to the piston chamber and the other end connected to the cavity inside the arc-shaped ring.

[0016] As a further improvement to this technical solution, the top inner side of the baffle is rotatably connected to a secondary push rod, the end of the secondary push rod away from the secondary push rod is rotatably connected to a main push rod, and the main push rod is slidably connected to the adapter box.

[0017] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0018] 1. In this extrusion-based corn threshing device, when the piston plate moves outward, the gas in the storage box instantly pushes the piston plate to move. At the same time, the gas enters the gas supply pipe, thereby pushing multiple extrusion strips to extrude the corn. As the arc-shaped ring moves downward, the extrusion strips are made to fit the shape of the corn, so that the corn kernels at the corn silk can be extruded by the extrusion strips during threshing, thereby improving the corn threshing effect and reducing the intensity of manual operation.

[0019] 2. In this extrusion-based corn threshing device, the dust is conveyed to a transfer box located on one side of the support frame. The transfer box is connected to the inside of the machine casing so that the purified hot air can be recycled, thereby avoiding the direct discharge of dust to the outside and affecting the surrounding environment. At the same time, the hot air generated by the heater is recycled to improve the corn threshing effect and reduce corn residue on the corn cob.

[0020] 3. In this extrusion-based corn threshing device, the piston plate pushes the main push rod to slide, which on the one hand causes the baffle to slide upward and open the air hole, so that the inside of the transfer box is connected to the air pipe, and on the other hand causes the movable plate to discharge the previously stored air into the air pipe, thereby increasing the flow rate of the gas sprayed from the exhaust box, which is beneficial to improving the drying and dust removal effect on corn. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0022] Figure 2 This is a right view of the structure of the driving device, extrusion section, and guide section of the present invention;

[0023] Figure 3 This is a right-hand view of the internal structure of the casing and air duct of the present invention.

[0024] Figure 4 This is a schematic diagram of the exploded structure of the arc-shaped ring and threshing roller of the present invention;

[0025] Figure 5 For the present invention Figure 4 Enlarged structural diagram at point A in the diagram;

[0026] Figure 6 This is a cross-sectional schematic diagram of the internal structure of the adapter box of the present invention;

[0027] Figure 7 For the present invention Figure 6 Enlarged structural diagram at point B in the diagram;

[0028] Figure 8 This is a top view of the internal structure of the adapter box of the present invention (cut section).

[0029] Figure 9 This is a left view of the push rod pushing the movable plate moving structure of the present invention;

[0030] Figure 10 This is a schematic diagram of the exhaust box structure for guiding smoke and dust according to the present invention.

[0031] The meanings of the labels in the diagram are as follows:

[0032] 100. Machine casing; 101. Dust hood; 110. Heater; 120. Screening device; 130. Drive device; 140. Threshing roller;

[0033] 150. Adapter box; 151. Piston chamber; 152. Exhaust box;

[0034] 160. Movable board;

[0035] 170. Baffle; 171. Main push rod; 172. Secondary push rod;

[0036] 180. Liquid reservoir; 181. Piezoelectric ceramic ring;

[0037] 190. Piston plate; 191. Push rod; 192. Return spring;

[0038] 200. Extrusion section;

[0039] 210. Electric hydraulic cylinder; 220. Arc ring; 221. Elastic rope; 230. Extrusion strip;

[0040] 300. Guidance Department;

[0041] 310. Air intake box; 311. Filter plate; 312. External air pipe; 313. Internal air pipe; 320. Fan. Detailed Implementation

[0042] The technical solutions of this invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this invention, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0043] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0044] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0045] Example

[0046] like Figure 1 , Figure 2 and Figure 3As shown, a corn threshing device based on extrusion processing is provided, including a housing 100 and a dust hood 101 disposed on the upper surface of the housing 100. A threshing roller 140 is disposed inside the dust hood 101. A screening device 120 is disposed on a support at the bottom of the housing 100, and a drive device 130 for driving the screening device 120 and the threshing roller 140 is disposed on a support above the screening device 120. A heater 110 for drying corn cobs is disposed at the front end of the housing 100, and a guide section 300 is disposed at the rear end of the housing 100. The guide section 300 threshers the corn on the threshing roller 140. During the threshing process, the extrusion section 200 on the threshing roller 140 extrudes the corn, and the guiding section 300 guides the dust generated during the threshing process. The dust is filtered and purified by the guiding section 300 and then transported to the transfer box 150 on one side of the support. The transfer box 150 is connected to the inside of the machine casing 100 so that the purified hot air can be recycled. This avoids the dust being directly discharged to the outside and affecting the surrounding environment. At the same time, the hot air generated by the heater 110 is recycled to improve the corn threshing effect and reduce the residue of corn on the corn cob.

[0047] Therefore, when threshing corn, the drive device 130 is started first, and the drive device 130 drives the threshing roller 140 and the screening device 120 to work. Then, the corn is added to the feed inlet of the dust hood 101. After the corn is threshed by the threshing roller 140, the corn kernels and corn cobs fall from the discharge port at the bottom of the machine casing 100 onto the screening device 120. Finally, the screening device 120 completes the screening of the corn kernels and corn cobs.

[0048] The above describes the corn threshing and screening process. In order to better remove the kernels from the corn cob, the corn is squeezed by the extrusion section 200 during threshing to achieve full contact between the corn and the threshing roller 140 and improve the threshing effect.

[0049] Therefore, based on the above structure, combined with Figure 4 The structure of the extrusion section 200 is further disclosed. The extrusion section 200 includes an electric hydraulic cylinder 210 and an arc ring 220. The electric hydraulic cylinder 210 is symmetrically arranged on the dust hood 101, and the telescopic rod of the electric hydraulic cylinder 210 passes through the dust hood 101 and is fixedly connected to the arc ring 220. The arc ring 220 is used to extrude corn, so that the corn can cooperate with the threshing roller 140 to thresh the corn and achieve a better threshing effect.

[0050] Meanwhile, during the corn threshing process, a large amount of smoke and dust is generated inside the machine casing 100. If directly emitted to the outside, it will affect the surrounding environment and the respiratory health of farmers. Therefore, returning to... Figure 3 and combined Figure 6As shown, a guide section 300 is provided at the end of the housing 100. The guide section 300 includes an air intake box 310 and a fan 320. The fan 320 is disposed inside an adapter tube that is fixedly connected to the adapter box 150. The air intake box 310 is detachably connected to the adapter tube and the housing 100 at both ends, and the bottom of the adapter tube is connected to an external air pipe 312, which passes through the adapter box 150. Thus, by starting the fan 320, the fan 320 agitates the airflow, using the airflow to guide the dust inside the housing 100 to the adapter box 150, achieving temporary storage, that is, the dust inside the housing 100 is transported to the adapter box 150. At this time, considering that there will still be dust in the air transported to the adapter box 150, recirculating it back to the housing 100 will increase the amount of dust inside it. Therefore, a filter plate 311 is installed inside the end of the air duct 310. The smoke and dust passing through the filter plate 311 are filtered and purified, and the clean air is delivered to the transfer box 150 for storage so that it can be recycled again.

[0051] At this point, combined with Figure 9 and Figure 10 As shown, air inside the adapter box 150 is transported through an air pipe connected to the air vent at the end of the adapter box 150. The end of the air pipe passes through the housing 100 and connects to an exhaust box 152 located inside the housing 100. The exhaust vent of the exhaust box 152 is inclined and tilted towards the exhaust end of the housing 100. Thus, the air blown out of the exhaust box 152 is recirculated back into the housing 100, and then combined with... Figure 6 As shown, with the assistance of the fan 320, the dust generated during the threshing process is transported to the air duct 310, and this cycle repeats. After the filter plate 311 has been used for a period of time, the air duct 310 is disassembled to clean the filter plate 311 for reuse.

[0052] Furthermore, the above operations are for dry corn during the corn threshing process. However, in actual use, it is difficult to ensure that the corn dried before threshing is completely dry, which causes some corn kernels to stick to the surface of the corn cob, thereby reducing the quality of corn threshing.

[0053] Therefore, when threshing wet corn, the heater 110 located at the front end of the casing 100 assists in drying the corn by means of air sprayed from the exhaust box 152, which in turn causes the heat generated by the heater 110 to flow through the threshing roller 140 to dry the corn, thereby improving the corn threshing effect and making it easier to use.

[0054] Furthermore, because the corn at the end (i.e. the corn silk) is conical, and the kernels at this position are smaller than those in the middle of the corn cob, a small number of unthreshed kernels will remain at the end during threshing. This necessitates manual threshing later, which affects efficiency.

[0055] Therefore, the following is combined with Figure 5 As shown, the extrusion section 200 also includes a plurality of extrusion strips 230 disposed in the cavity inside the arc-shaped ring 220. Each extrusion strip 230 is fixedly connected to an elastic rope 221, the end of which is fixedly connected to the inner wall of the cavity. As the arc-shaped ring 220 moves downward, the plurality of extrusion strips 230 extrude the corn, so that the extrusion strips 230 are adapted to the shape of the corn. This allows the corn kernels at the corn silk to be extruded through the extrusion strips 230 during threshing, thereby improving the corn threshing effect and reducing the intensity of manual operation.

[0056] Return to Figure 6 As shown, the increased dust and smoke inside the casing 100 during corn threshing at the corn silk area necessitates improved suction power. Therefore, an inner air pipe 313 is fitted inside the outer air pipe 312. The inner air pipe 313 is fixedly connected to a movable plate 160. Slider blocks are located at the upper and lower ends of the movable plate 160, and these sliders are slidably connected to grooves within the adapter box 150. A baffle 170 is slidably connected to the outside of the adapter box 150. Normally, the baffle 170 is in a closed state (see reference). Figure 6 (As shown). Thus, air is delivered through the inner air pipe 313 to the space between the movable plate 160 and the baffle 170.

[0057] In the above process, the movable plate 160 is pushed inward by air, and during the movement, the movable plate 160 abuts against the push rod 191 of the sliding connection adapter box 150. The end of the push rod 191 is fixedly connected to the piston plate 190, and the piston plate 190 is sleeved and fitted into the piston cavity 151 formed inside the adapter box 150. On the other hand, in Figure 6 Based on and combined Figure 7 As shown, the piston plate 190 is fixedly connected to the return spring 192 on the opposite side of the push rod 191. The piezoelectric ceramic ring 181 on the inner wall of the piston cavity 151 is in contact with the return spring 192. The piezoelectric ceramic ring 181 is electrically connected to a heating resistor through a wire. The liquid storage box 180 connected to the piston cavity 151 is fixedly connected to the adapter box 150. The heating resistor is located inside the liquid storage box 180, and a pressure valve is provided at the connection between the piston cavity 151 and the liquid storage box 180. During this process, the return spring 192 will simultaneously compress the piezoelectric ceramic ring 181, making it energized. The heating resistor connected to the piston plate 191 will heat the liquid storage box 180, and the low-boiling-point liquid in the liquid storage box 180 will evaporate rapidly. When the opening pressure of the pressure valve is reached, the liquid will rush outward, and the gas will push the piston plate 190 to slide outward.

[0058] Secondly, cooperation Figure 5 and Figure 8As shown, the air supply pipe is connected to the outside of the adapter box 150. One end of the air supply pipe is connected to the piston chamber 151, and the other end is connected to the cavity inside the arc ring 220. Thus, when the piston plate 190 moves inside, the gas in the piston chamber 151 enters the air supply pipe. At this time, the pressure in the air supply pipe is relatively small, so that the gas pushes the extrusion block 230 with a smaller force.

[0059] When the piston plate 190 moves outward, the gas in the liquid storage box 180 instantly pushes the piston plate 190 to move. At the same time, the gas enters the gas supply pipe, thereby pushing multiple extrusion blocks 230 to extrude the corn and improve the corn threshing effect.

[0060] It should be noted that: because the arc-shaped ring 220 moves up and down, in order to accommodate the movement of the arc-shaped ring 220, a bellows can be installed at the connection between the air supply pipe and the arc-shaped ring 220, or it can be installed as... Figure 6 The outer air tube 312 and the inner air tube 313 are fitted together in a middle.

[0061] Simultaneously, the inner top of the baffle 170 is rotatably connected to the secondary push rod 172, and the end of the secondary push rod 172 away from the secondary push rod 172 is rotatably connected to the main push rod 171. The main push rod 171 is slidably connected to the adapter box 150. At this time, the piston plate 190 pushes the main push rod 171 to slide, which on the one hand causes the baffle 170 to slide upward and open the air hole, so that the interior of the adapter box 150 is connected to the air pipe, and on the other hand causes the movable plate 160 to discharge the previously stored air into the air pipe, thereby increasing the flow rate of the gas ejected from the exhaust box 152 (see reference). Figure 10 As shown in the figure, it is beneficial to improve the drying and dust removal effect of corn.

[0062] The sliding of the piston plate 190 will cause the return spring 192 to move, and after disengaging from the piezoelectric ceramic ring 181, the heating resistor will be unable to heat the liquid storage box 180. Furthermore, a cooling device is provided on the top of the liquid storage box 180. The cooling device will gradually liquefy the gas in the liquid storage box 180, thereby reducing the amount of gas flowing out of the pressure valve and gradually dropping it to zero. The piston plate 190 will return to its initial state, and the baffle 170 will close the air hole again under the action of gravity. At this time, a sealed space will be re-formed between the movable plate 160 and the baffle 170, and the subsequent air will continue to be stored under the action of the fan 320. The above process will be repeated.

[0063] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A corn threshing device based on extrusion, comprising a housing (100) and a dust hood (101) disposed on the upper surface of the housing (100), a threshing roller (140) disposed inside the dust hood (101), a screening device (120) disposed on a support at the bottom of the housing (100), and a drive device (130) for driving the screening device (120) and the threshing roller (140) disposed on a support above the screening device (120), characterized in that: The front end of the housing (100) is provided with a heater (110) for drying corn cobs, and the rear end of the housing (100) is provided with a guide part (300). When the threshing roller (140) is threshing, the extrusion part (200) provided on the threshing roller (140) extrudes the corn. The guide part (300) guides the dust generated during the threshing process, and the dust is filtered and purified through the guide part (300). The dust is transported to the transfer box (150) provided on one side of the support. The transfer box (150) is connected to the inside of the housing (100) so that the purified hot air can be recycled again. The extrusion section (200) includes an electric hydraulic cylinder (210) and an arc ring (220). The electric hydraulic cylinder (210) is symmetrically arranged on the dust hood (101), and the telescopic rod of the electric hydraulic cylinder (210) passes through the dust hood (101) and is fixedly connected to the arc ring (220). The arc ring (220) is used to extrude corn. The extrusion section (200) further includes a plurality of extrusion strips (230) disposed in the cavity inside the arc ring (220), and an elastic rope (221) is fixedly connected to each extrusion strip (230), the end of the elastic rope (221) being fixedly connected to the inner wall of the cavity; The guide section (300) includes an air duct box (310) and a fan (320). The fan (320) is installed inside the adapter tube of the fixedly connected adapter box (150). The two ends of the air duct box (310) are detachably connected to the adapter tube and the housing (100), and the bottom of the adapter tube is connected to the external air pipe (312). The external air pipe (312) passes through the adapter box (150). A filter plate (311) is installed inside the end of the air duct box (310). An inner air tube (313) is fitted inside the outer air tube (312). The inner air tube (313) is fixedly connected to a movable plate (160). The upper and lower ends of the movable plate (160) are provided with sliders. The sliders are slidably connected to a groove opened in the adapter box (150). A baffle (170) is provided on the outside of the adapter box (150) and is slidably connected to the adapter box (150). Under normal conditions, the baffle (170) is in a closed state. The movable plate (160) is pushed inward by air. During the movement, the movable plate (160) abuts against the top rod (191) of the sliding connection adapter box (150). The end of the top rod (191) is fixedly connected to the piston plate (190). The piston plate (190) is sleeved and fitted into the piston cavity (151) formed inside the adapter box (150). The piston plate (190) is fixedly connected to the return spring (192) on the opposite side of the top rod (191). The piezoelectric ceramic ring (181) provided on the inner wall of the piston cavity (151) is in contact with the return spring (192). The piezoelectric ceramic ring (181) is electrically connected to a heating resistor through a wire. The liquid storage box (180) connected to the piston cavity (151) is fixedly connected to the adapter box (150). The heating resistor is located inside the liquid storage box (180). A pressure valve is provided at the connection between the piston cavity (151) and the liquid storage box (180). A cooling device is provided on the top of the liquid storage box (180). The air supply pipe connected to the outside of the adapter box (150) has one end connected to the piston chamber (151) and the other end connected to the cavity inside the arc ring (220).

2. The corn threshing device based on extrusion as described in claim 1, characterized in that: The air inside the adapter box (150) is transported through the air pipe connected to the air hole at the end of the adapter box (150). The end of the air pipe passes through the housing (100) and connects to the exhaust box (152) set inside the housing (100). The exhaust hole of the exhaust box (152) is inclined and tilted towards the exhaust end of the housing (100).

3. The corn threshing device based on extrusion as described in claim 2, characterized in that: The inner top of the baffle (170) is rotatably connected to the secondary push rod (172), and the end of the secondary push rod (172) away from the secondary push rod (172) is rotatably connected to the main push rod (171). The main push rod (171) is slidably connected to the adapter box (150).

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