Digestive endoscope operation practice teaching device

Abstract

The invention relates to the technical field of digestive endoscopes, in particular to a digestive endoscope operation practice teaching device. Comprising an upper cover, a lower cover and a simulation piece, a cover plate is arranged at the top of the upper cover, a rotating mechanism is arranged on one side of the simulation piece, a spraying mechanism is arranged on the rotating mechanism, the spraying mechanism is communicated with a scraping plate arranged at the end of the rotating mechanism, and the rotating mechanism is used for rotating along the stomach contour in the simulation piece and applying pressure to the spraying mechanism; and the rotating mechanism drives the scraping plate to move in the simulation piece, and the scraping plate is used for being attached to the stomach outline in the simulation piece, that is, the scraping plate slides from the narrow end of the stomach outline of the simulation piece to the wide end of the stomach outline of the simulation piece. The stomach contour can be effectively covered by gradually matching the scraping plate with the stomach contour in the sliding process, external force is applied to the ejector rod through the balancing weight, the ejector rod applies thrust to the baffle, the baffle applies pressure to the scraping plate, the attaching tightness of the scraping plate and the stomach contour is guaranteed, and the cleaning effect is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of digestive endoscopy, and more specifically, to a teaching device for practicing digestive endoscopy operations. Background Art

[0002] Digestive endoscopy technology plays a key role in the diagnosis and treatment of digestive system diseases. With the continuous development of medical technology, the skill requirements for digestive endoscopy operators are increasing day by day. The traditional digestive endoscopy teaching mode mainly relies on theoretical lectures and watching surgical videos. Students lack the opportunity to practice hands-on, and it is difficult to practice in the real human anatomical structure and physiological environment. This leads to problems such as students being unskilled in operation and inaccurate in lesion identification during their first clinical practice, increasing the pain of patients and medical risks.

[0003] Currently, Chinese Patent Publication No.: CN119626080A proposes a simulation device for digestive endoscopes, including a base, and four support legs for supporting the device are fixedly connected to the bottom of the base; it also includes: a first simulation chamber, a gastric simulation area for practicing digestive endoscopes is opened in the middle position at the top of the first simulation chamber, a first empty slot for installing a cleaning device is opened on one side of the gastric simulation area at the top of the first simulation chamber, and a second empty slot is opened on the other side of the gastric simulation area at the top of the first simulation chamber. By mutually adjusting and controlling the contact positions of the first scraper and the second scraper with the gastric simulation area through the second hydraulic cylinder and the third hydraulic cylinder, the inside of the gastric simulation area can be cleaned and scraped.

[0004] Although the existing simulation devices are convenient to use, there are still some problems. For example: the existing simulation devices are used frequently in students' practical exercises, which will cause bacteria and stains to generate in the inner cavity of the simulation devices. However, the simulation devices are made by imitating the internal structure of the human body and have certain requirements for internal sealing in order to better simulate the internal organs of the human body. This makes it difficult to open the simulation devices, and it is more difficult to clean the inside. Completely opening the simulation devices for manual treatment also allows a large number of bacteria from the outside to enter the inside of the simulation devices, instead increasing the cleaning difficulty; Although in the comparative document, the contact positions of the first scraper and the second scraper with the gastric simulation area can be mutually adjusted and controlled through the second hydraulic cylinder and the third hydraulic cylinder to clean and scrape the inside of the gastric simulation area, however, the inside of the simulation device imitates human organs and is in an uneven state, and there is a gap between the first scraper and the second scraper. When moving horizontally or vertically, due to the inability to adapt to the gastric simulation area, there are phenomena of cleaning dead corners and omissions. Summary of the Invention

[0005] The present invention provides a teaching device for digestive endoscopy operation practice. During the process of the scraper sliding, it gradually adapts to the gastric contour, can effectively cover the gastric contour, and uses a counterweight to apply an external force to the ejector rod. The ejector rod exerts a thrust on the baffle, causing the baffle to press on the scraper to ensure the tight fit between the scraper and the gastric contour, thus solving the problems raised in the above background technology, that is: There is a gap between the first scraper and the second scraper. When moving horizontally or vertically, due to the inability to adapt to the gastric simulation area, there are phenomena of cleaning dead corners and omissions.

[0006] To achieve the above object, the teaching device for digestive endoscopy operation practice includes an upper cover, a lower cover and a simulation member. A cover plate is provided on the top of the upper cover. A rotating mechanism is provided on one side of the simulation member. A spraying mechanism is provided on the rotating mechanism. The spraying mechanism is communicated with a scraper at the end of the rotating mechanism. The rotating mechanism is used to rotate along the gastric contour in the simulation member and apply pressure to the spraying mechanism, so that the disinfectant liquid sprayed in the spraying mechanism disinfects the simulation member. The rotating mechanism drives the scraper to move in the simulation member. The scraper is used to fit with the gastric contour in the simulation member, so that the scraper slides from the narrow end to the wide end of the gastric contour of the simulation member to scrape the disinfectant liquid to the end of the simulation member.

[0007] The scraper is arc-shaped and coincides with the gastric contour of the simulation member.

[0008] In the above technical solution, during the process of the scraper sliding, it gradually adapts to the gastric contour, can effectively cover the gastric contour, improve the cleaning effect, and reduce the number of times of manually opening the device by realizing the cleaning inside the simulation member.

[0009] Secondly, during the process of realizing the spraying of the disinfectant liquid, the spraying mechanism includes a box body provided at the fixed end of the telescopic plate, and a spraying ring adhesively provided on the scraper. A liquid supply pipe is communicated between the spraying ring and the box body. A plurality of nozzles are arranged at intervals on the spraying ring. An air delivery pipe is communicated between the box body and the piston cylinder.

[0010] In the above technical solution, an air inlet pipe is provided on the side opposite to the connection between the air delivery pipe and the piston cylinder. The air inlet pipe is communicated with the piston cylinder. Check valves are arranged in both the air inlet pipe and the air delivery pipe. During use, the check valve in the air inlet pipe allows external air to enter the piston cylinder, and the check valve in the air delivery pipe is used to deliver the air inside the piston cylinder to the box body to apply pressure to the disinfectant liquid in the box body.

[0011] Compared with the prior art, the beneficial effects of the present invention: 1. During the process of the scraper sliding, it gradually adapts to the gastric contour, effectively covering the gastric contour. The counterweight applies an external force to the ejector rod, and the ejector rod exerts a thrust on the baffle, causing the baffle to press on the scraper, ensuring the tight fit between the scraper and the gastric contour and helping to improve the cleaning effect.

[0012] 2. Under the action of the gravity of the counterweight, the ejector rod applies a thrust to the baffle, causing the baffle to slide along the track of the slide rail and gradually release the corresponding valve plate from the drain hole, connecting the liquid accumulation cavity and the drain cavity. The disinfectant liquid sprays out from the nozzle, thereby covering the area where the range of the gastric contour increases, improving the disinfection effect on the gastric contour, and saving the use of disinfectant liquid at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 is a schematic diagram of the overall structure of the present invention; Figure 2 is an exploded structure schematic diagram of the upper cover and the lower cover of the present invention; Figure 3 is a top view of the simulation part and the spraying mechanism of the present invention; Figure 4 is an exploded structure schematic diagram of the telescopic plate and the scraper of the present invention; Figure 5 is a top view of the piston rod sliding along the simulation part of the present invention; Figure 6 For the present invention Figure 5 is an enlarged structure schematic diagram at position A; Figure 7 is a schematic diagram of the structural change of the scraper of the present invention; Figure 8 is an exploded structure schematic diagram of the spraying ring, the scraper, the baffle, and the slide rail of the present invention; Figure 9 is a schematic diagram of the connection structure between the spraying ring and the baffle of the present invention; Figure 10 For the present invention Figure 9 is an enlarged structure schematic diagram at position B; Figure 11 is a right view of the sectional structure of the spraying ring of the present invention.

[0014] The meanings of the various reference numerals in the figure are as follows: 100, upper cover; 101, lower cover; 102, simulation part; 110, rotating mechanism; 111, motor; 112, telescopic plate; 113, piston cylinder; 114, piston rod; 115, one-way valve; 120, spraying mechanism; 121, box body; 122, spraying ring; 123, gas transmission pipe; 124, liquid supply pipe; 130, scraper; 131, vertical plate; 140. Counterweight; 141. Thumb rod; 142. Baffle; 143. Slide rail; 150. Partition board; 151. Drain hole; 152. Valve plate; 153. Compression spring. Specific implementation mode

[0015] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0016] In view of the fact that during the operation practice of a digestive endoscope, the inside of the simulation device imitates human organs and is in an uneven state, and there is a gap between the first scraper and the second scraper. When moving horizontally or vertically, since it cannot be adapted to the gastric simulation area, there are phenomena of cleaning dead corners and omissions. The present invention provides a teaching device for digestive endoscope operation practice. Refer to Figures 1-4 As shown, it includes an upper cover 100, a lower cover 101 and a simulation part 102. A cover plate is provided at the top of the upper cover 100. When the upper cover 100 and the lower cover 101 are fitted, there are glove holes on both sides of the upper cover 100 and the lower cover 101 that communicate with the simulation part 102. An operation glove (which belongs to the prior art and is not shown in the figure) is provided on the glove holes so that the arm can be extended into the gastric contour of the simulation part 102 for operation during simulation; Secondly, a rotating mechanism 110 is provided on one side of the simulation part 102, and a spraying mechanism 120 is provided on the rotating mechanism 110. The spraying mechanism 120 is communicated with a scraper 130 at the end of the rotating mechanism 110. First, during the rotation of the rotating mechanism 110, the rotating mechanism 110 is used to rotate along the gastric contour in the simulation part 102 and apply pressure to the spraying mechanism 120, so that the disinfectant sprayed in the spraying mechanism 120 disinfects the simulation part 102. At the same time, the rotating mechanism 110 drives the scraper 130 to move in the simulation part 102. The scraper 130 is used to fit the gastric contour in the simulation part 102, so that the scraper 130 slides from the narrow end to the wide end of the gastric contour of the simulation part 102 to scrape the disinfectant to the end of the simulation part 102, thereby solving the problem of cleaning the inside of the simulation part 102 and reducing the number of times of manually opening the device.

[0017] Next, in conjunction with Figure 3 and Figure 4The specific structure of the rotating mechanism 110 is shown. Among them, the rotating mechanism 110 includes a motor 111 and a telescopic plate 112. The motor 111 is located on one side of the simulation part 102. The fixed end of the telescopic plate 112 is coaxially connected to the output shaft of the motor 111. A vertical plate 131 is fixedly arranged at the telescopic end. The vertical plate 131 is fixedly arranged with a scraper 130. In this way, after the simulation ends, initially, the scraper 130 is located at the narrow end of the gastric contour of the simulation part 102. The motor 111 drives the fixed end of the telescopic plate 112 to rotate, and the telescopic end and the scraper 130 rotate synchronously with the fixed end. During the rotation process, the scraper 130 slides from the narrow end to the wide end to achieve the cleaning work of the simulation part 102.

[0018] As above, the scraper 130 is used to clean the inside of the simulation part 102. The scraper 130 is arc-shaped and conforms to the gastric contour of the simulation part 102. During the cleaning process, the design of the scraper 130 can better adapt to the curve and contour of the stomach, ensuring that it can fit the gastric wall during the cleaning process, leaving no dead corners for cleaning the gastric wall and improving the cleaning effect.

[0019] Furthermore, in order to spray disinfectant on one side while scraping with the scraper 130 on the other side when the telescopic plate 112 rotates, for this reason, the following is Figure 4 on the basis of and in combination with Figure 5 shown, the rotating mechanism 110 further includes a piston cylinder 113 fixedly arranged at the bottom of the fixed end. The piston cylinder 113 is inclined and has an opening at the end. The inclined setting means taking Figure 3 as an example. In the top view direction, an included angle is formed between the piston cylinder 113 and the telescopic plate 112 in this state; and a piston rod 114 is sleeved and fitted inside the piston cylinder 113. The end of the piston rod 114 is bent downward to form a bent end. The bent end is placed on the edge of the gastric contour of the simulation part 102 and is arranged out of alignment with the scraper 130. Among them, the purpose of forming the misalignment between the bent end and the scraper 130 is that when the telescopic plate 112 rotates, the scraper 130 rotates synchronously with the piston cylinder 113, and the end of the piston rod 114 slides along the edge. At this time, referring to Figure 7 shown, initially, the scraper 130 located at the narrow end of the gastric contour is shown by a solid line. The two ends of the scraper 130 extend beyond the gastric contour, and its middle part fits the narrow end of the gastric contour. If the bent end of the piston cylinder 113 is arranged at the end of the scraper 130, it will hinder the end of the scraper 130. At the same time, the middle part of the scraper 130 fits the gastric contour, causing the part between the end and the middle of the scraper 130 to be separated from the gastric contour, generating a gap, thereby affecting the cleaning effect of the gastric contour.

[0020] In addition, while the scraping plate 130 is traveling within the gastric contour, the spraying mechanism 120 sprays a disinfectant solution into the gastric contour, achieving the purpose of disinfecting and cleaning the inside of the gastric contour simultaneously. Thus, the structure of the spraying mechanism 120 is shown below. The spraying mechanism 120 includes a box body 121 provided at the fixed end of the telescopic plate 112, and a spraying ring 122 adhesively provided on the scraping plate 130. A liquid supply pipe 124 is connected between the spraying ring 122 and the box body 121. A number of nozzles are spacedly arranged on the spraying ring 122. An air delivery pipe 123 is connected between the box body 121 and the piston cylinder 113.

[0021] On the other hand, in combination with Figure 6 As shown, an air inlet pipe is provided on the side opposite to the connection between the air delivery pipe 123 and the piston cylinder 113. The air inlet pipe is connected to the piston cylinder 113. Check valves 115 are provided in both the air inlet pipe and the air delivery pipe 123. The check valve 115 located in the air inlet pipe allows external air to enter the piston cylinder 113, and the check valve 115 located in the air delivery pipe 123 is used to convey the air inside the piston cylinder 113 into the box body 121 to apply pressure to the disinfectant solution in the box body 121.

[0022] Working principle: When the bent end of the piston rod 114 gradually slides from the narrow end to the wide end of the gastric contour, in the initial stage (the upper half of the gastric contour trajectory), the bent end slides along the gastric contour, and the piston rod 114 extends out of the piston cylinder 113. During this process, the check valve 115 in the air inlet pipe is in the closed state, so the air in the piston cylinder 113 at the end of the piston rod 114 is pressed into the box body 121 through the air delivery pipe 123. At this time, the disinfectant solution is sprayed out from the nozzles (refer to Figure 11 as shown) to disinfect the gastric contour; On the contrary, when the bent end of the piston rod 114 slides to the lower half of the trajectory, that is, the lower half of the trajectory presents the Figure 3 state shown. The already extended piston rod 114 cannot be extended again. At this time, the pressure applied to the box body 121 by the air accumulated in the upper half of the trajectory can be used to continue to convey the disinfectant solution into the nozzles. And during this process, the pressure in the box body 121 is gradually weakening. When the pressure disappears, the disinfectant solution can be scraped to the wide end of the gastric contour by the scraping of the scraping plate 130 and discharged from the small holes at the wide end, thus achieving the cleaning effect on the inside of the gastric contour.

[0023] After the cleaning is completed, the piston rod 114 is manually pushed backward. At this time, the check valve 115 in the air delivery pipe 123 is in the closed state, and external air enters the piston cylinder 113.

[0024] Furthermore, in the initial stage, both sides of the scraper 130 exceed the two sides of the stomach contour. If the nozzles of the exceeded parts also spray disinfectant, it will cause the disinfectant to splash on the simulation part 102, which not only causes waste but also increases the cleaning difficulty in the later stage. Therefore, as Figure 8 , Figure 9 and Figure 10 shown, a baffle 142 is adhesively provided on the spraying ring 122 on the opposite side of the nozzle. The baffle 142 is used to control the opening and closing of the valve assembly inside the spraying ring 122. A partition 150 is fixedly provided inside the spraying ring 122. The partition 150 divides the inside of the spraying ring 122 into a liquid accumulation chamber and a liquid discharge chamber. The liquid accumulation chamber and the liquid discharge chamber are communicated through a plurality of liquid discharge holes 151 on the partition 150. The liquid discharge chamber is communicated with the nozzle; The valve assembly includes a valve plate 152 for blocking the liquid discharge holes 151. One end of the valve plate 152 penetrates through the spraying ring 122, and a compression spring 153 is elastically connected between the other end and the inner wall of the liquid discharge chamber. A baffle 142 is adhesively provided on the spraying ring 122, and a slide rail 143 is slidably provided on the outside of the baffle 142. The slide rail 143 is fixedly provided with the scraper 130; Therefore, when the scraper 130 is in the initial stage, both ends of the scraper 130 that are placed on the stomach contour are upturned. In this state, some of the liquid discharge holes 151 are blocked by the valve plate 152, blocking the communication between the liquid accumulation chamber and the liquid discharge chamber and restricting the spraying of the disinfectant from the nozzle. In addition, the liquid discharge holes 151 located in the middle of the spraying ring 122 are always in a conducting state (refer to Figure 11 shown). Similarly, when the scraper 130 is located at the narrow end of the stomach contour, the liquid accumulation chamber and the liquid discharge chamber that exceed the stomach contour are blocked by the valve plate 152, while the liquid accumulation chamber and the liquid discharge chamber within the stomach contour range are in a conducting state. In this way, the waste of the disinfectant can be reduced, and the nozzles that spray the disinfectant are adapted to the stomach contour range.

[0025] It should be noted that considering that the stomach contour is in an asymmetric state during the movement of the scraper 130, in order to facilitate the scraper 130 to gradually adapt to the stomach contour, therefore, the spraying ring 122, the scraper 130, the baffle 142, the slide rail 143 and the partition 150 are all made of elastic materials, such as rubber; Preferably, the baffle 142 is rotatably provided at one end of the ejector rod 141. A counterweight 140 is rotatably provided at the other end of the ejector rod 141. The counterweight 140 is slidably provided with the vertical plate 131. For the state of the scraper 130 in the initial stage, please refer to Figure 7 the solid line part shown in. In this state, the end of the scraper 130 is upturned and placed on the edge of the stomach contour. Since the frictional force between the baffle 142 and the slide rail 143, the scraper 130 and the spraying ring 122 overcomes the thrust exerted by the counterweight 140 on the ejector rod 141, the baffle 142 remains in its original state; As the scraping of the scraper 130 continues, the range of the gastric contour increases, and the scraper 130 expands outward to fit the gastric contour. During this process, the state reference of the scraper 130 Figure 7 is shown by the dotted line part in Figure 7 . Under the action of the gravity of the counterweight 140, a thrust is applied to the baffle 142 through the ejector rod 141, so that the baffle 142 slides along the track of the slide rail 143, and gradually releases the corresponding valve plate 152 from the drain hole 151, so that the liquid accumulation cavity and the drain cavity are communicated, and the disinfectant is sprayed out from the nozzle, thereby covering the area where the range of the gastric contour increases, improving the disinfection effect of the gastric contour, and saving the use of the disinfectant at the same time.

[0026] Moreover, by gradually adapting to the gastric contour during the sliding process of the scraper 130, the gastric contour can be effectively covered, and an external force is applied to the ejector rod 141 by the counterweight 140. The ejector rod 141 applies a thrust to the baffle 142, so that the baffle 142 presses on the scraper 130, ensuring the tightness of the fit between the scraper 130 and the gastric contour, which helps to improve the cleaning effect.

[0027] And, by separating the counterweight 140 on the vertical plate 131, it is made that Figure 7 when the two side scrapers 130 in Figure 7 are adapted to the gastric contour, they can be matched according to different positions of the gastric contour to form a coverage of the gastric contour.

[0028] The above shows and describes 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 by the above embodiments. The above embodiments and the descriptions in the specification are only preferred examples of the present invention and are not used to limit the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed. The scope of protection claimed by the present invention is defined by the appended claims and their equivalents.

Claims

1. A digestive endoscopy operation practice and teaching device, comprising an upper cover (100), a lower cover (101) and a simulation member (102), wherein a cover plate is disposed on the top of the upper cover (100), and wherein: A rotating mechanism (110) is disposed on one side of the simulation member (102), a spraying mechanism (120) is disposed on the rotating mechanism (110), and the spraying mechanism (120) is connected to a scraper (130) disposed at the end of the rotating mechanism (110); The rotating mechanism (110) is used to rotate along the stomach contour of the simulation member (102) and apply pressure to the spraying mechanism (120), so that the disinfectant sprayed from the spraying mechanism (120) disinfects the simulation member (102); The rotating mechanism (110) drives the scraper (130) to move inside the simulation member (102); the scraper (130) is used to fit the stomach contour inside the simulation member (102), so that the scraper (130) slides from the narrow end of the stomach contour of the simulation member (102) to the wide end, so as to scrape the disinfectant to the end of the simulation member (102).

2. The digestive endoscopy operation practice teaching device according to claim 1, characterized in that: The rotating mechanism (110) comprises a motor (111) and a telescopic plate (112); the motor (111) is located on one side of the simulation component (102); a fixed end of the telescopic plate (112) is coaxially connected to an output shaft of the motor (111); and a vertical plate (131) is fixedly provided at the end of the telescopic end.

3. The digestive endoscopy operation training and teaching device according to claim 2, characterized in that: The vertical plate (131) and the scraper (130) are fixedly arranged, and the scraper (130) is arc-shaped and matches the stomach contour of the simulation member (102).

4. The digestive endoscopy operation training and teaching device according to claim 3, characterized in that: The rotating mechanism (110) further comprises a piston cylinder (113) fixedly arranged at the bottom of the fixed end, the piston cylinder (113) being inclined and having an opening at the end, and a piston rod (114) being sleeved and fitted inside the piston cylinder (113), the end of the piston rod (114) being bent downward to form a bent end, the bent end being placed on the edge of the stomach contour of the simulation component (102) and being offset from the scraper (130), and the end of the piston rod (114) sliding along the edge.

5. The digestive endoscopy operation training and teaching device according to claim 4, characterized in that: The spraying mechanism (120) comprises a box body (121) arranged on the fixed end of the telescopic plate (112), and a spraying ring (122) bonded to the scraper (130); a liquid supply pipe (124) is connected between the spraying ring (122) and the box body (121); a plurality of spray heads are arranged at intervals on the spraying ring (122); and an air supply pipe (123) is connected between the box body (121) and the piston cylinder (113).

6. The digestive endoscopy operation training and teaching device according to claim 5, characterized in that: An air inlet pipe is provided on the side opposite to the connection between the air supply pipe (123) and the piston cylinder (113), the air inlet pipe is in communication with the piston cylinder (113), and a one-way valve (115) is provided in both the air inlet pipe and the air supply pipe (123). The one-way valve (115) in the air inlet pipe allows external air to enter the piston cylinder (113), and the one-way valve (115) in the air supply pipe (123) is used to allow the air inside the piston cylinder (113) to be transported into the box (121), so as to apply pressure to the disinfectant in the box (121).

7. The digestive endoscopy operation training and teaching device according to claim 6, characterized in that: A baffle (142) is fitted on the spray ring (122) on the opposite side of the spray head, and the baffle (142) is used to control the opening and closing of a valve assembly inside the spray ring (122).

8. The digestive endoscopy operation training and teaching device according to claim 7, characterized in that: A partition (150) is fixedly arranged inside the spray ring (122), and the partition (150) divides the inside of the spray ring (122) into a liquid accumulation chamber and a liquid discharge chamber. The liquid accumulation chamber and the liquid discharge chamber are connected through a plurality of liquid discharge holes (151) on the partition (150), and the liquid discharge chamber is connected to the spray head.

9. The digestive endoscopy operation training and teaching device according to claim 7, characterized in that: The valve assembly comprises a valve plate (152) for blocking the drainage hole (151); one end of the valve plate (152) passes through the spray ring (122); the other end is elastically connected to the inner wall of the drainage cavity by a compression spring (153); a baffle (142) is fitted on the spray ring (122); a slide rail (143) is slidably arranged on the outer side of the baffle (142); and the slide rail (143) is fixedly arranged on the scraper (130).

10. The digestive endoscopy operation training and teaching device according to claim 8, characterized in that: The baffle (142) is rotatably arranged at one end of the top rod (141), and a counterweight (140) is rotatably arranged at the other end of the top rod (141). The counterweight (140) is slidably arranged with the vertical plate (131), and the counterweight (140) on the vertical plate (131) is separately arranged.

Images