A sterilizing spray device for preventing and controlling potato stem canker

By designing a sterilization spraying device with an adjustable spray head, using a strong wind spraying method from bottom to top, the problem of uneven spraying in the prior art is solved, and the prevention and treatment effect of potato stem ulcer disease is improved.

CN119183853BActive Publication Date: 2025-03-18ULANQAB INST OF AGRI & FORESTRY SCI
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Patent Information

Application Number
CN202411679490.2
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2024-11-22
Publication Date
2025-03-18
Estimated Expiration
2044-11-22

AI Technical Summary

Technical Problem

The existing potato spraying device spray head is arranged above, resulting in most of the sprayed sterilization liquid being sprayed on the leaves, the possibility of direct spraying between the stem and the sterilization liquid is low, and the spray uniformity and density are different, resulting in a reduction in the prevention and treatment effect.

Method used

A sterilization spraying device for the prevention and treatment of potato stem ulcer disease is designed. It adopts a strong wind spraying method from bottom to top. The adjustable nozzle is always attached to the upper surface of the field ridge edge during movement, ensuring that the spraying liquid evenly covers the stem and leaves.

Benefits of technology

It improves the uniformity and density of spraying, ensures uniform protection of stems and leaves, reduces the possibility of poor spraying effect, and improves the prevention and control effect.

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Abstract

The invention relates to a sterilizing spraying device for preventing and treating potato stem canker, comprising a mobile platform, a liquid storage module, an adjustable conveying module, an adjustable nozzle and a spraying module. The present application can solve the problem that the existing spraying mode is to spray from top to bottom. Since the leaves are located at the top of the plant and the shielding area is large, most of the sprayed sterilizing liquid is sprayed on the leaves, resulting in a low possibility of direct spraying of the stem of the plant with the sterilizing liquid, which is not conducive to the uniformity of spraying. In addition, the spraying density of the existing sterilizing liquid is controlled by personnel, so that the density of the sterilizing liquid sprayed in each area is different, and the spraying may be sparse in some areas, thereby reducing the prevention and control effect.
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Description

Technical Field

[0001] The invention relates to the technical field related to potato prevention and control, and in particular to a sterilization spraying device for preventing and controlling potato stem canker. Background Art

[0002] In recent years, with the expansion of potato planting area year by year, potato diseases have become more and more serious. Potato black mole disease is a common disease during potato growth, which seriously affects the quality and marketability of potatoes and causes great losses to farmers. Potato black mole disease, also known as "potato wilt Rhizoctonia solani, potato brown rough skin disease, potato stem canker", is a soil-borne fungal disease. It is mainly manifested in the formation of black or dark brown patches on the epidermis of potatoes, namely black mole disease sclerotia. In potato-growing areas, black mole disease is becoming more and more serious, and the incidence is relatively common. It can generally cause a potato yield reduction of about 15%, and in some years it can even destroy the entire field, seriously affecting the yield and quality of potatoes. When potato stem canker disease occurs on a large scale, the existing method is mainly spraying prevention and control.

[0003] Existing spraying devices, such as Chinese patent with publication number CN218125834U, disclose a potato seed potato stem tip virus-free seedling cultivation box, whose structure includes an irrigation box and a water tank, and the top of the irrigation box is welded to the bottom of the water tank; by arranging a spraying mechanism on the inner wall of the irrigation box, this mechanism can operate flexibly, and when irrigating the potato seed potato stem tip virus-free seedlings, the spraying mechanism can swing, thereby irrigating the potato seed potato stem tip virus-free seedlings more comprehensively and promoting the growth of the potato seed potato stem tip virus-free seedlings; by arranging an adjustment mechanism at the right end of the protective box, this mechanism can adjust and control the area of ​​photosynthesis of the potato seed potato stem tip virus-free seedlings at night according to needs, thereby improving the overall work efficiency.

[0004] In the above technology, the nozzle is arranged on the top, and the spraying method is from top to bottom. Since the leaves are at the top of the plant and the shielding area is large, most of the sprayed sterilizing liquid is sprayed on the leaves, resulting in a lower possibility of direct spraying of the stem of the plant with the sterilizing liquid, which is not conducive to the uniformity of spraying. In addition, the existing sterilizing liquid spraying density is controlled by personnel, resulting in different densities of sterilizing liquid sprayed in different areas, and the spraying may be sparse in some areas, thereby reducing the prevention and control effect.

[0005] Based on this, there is still room for improvement on the existing spraying technology. Summary of the invention

[0006] The object of the present invention is to provide a sterilizing spray device for preventing and treating potato stem canker, so as to solve the deficiencies in the above-mentioned prior art.

[0007] In order to achieve the above object, the present invention provides the following technical solutions:

[0008] A sterilizing spraying device for preventing and treating potato stem canker disease comprises a mobile platform; a liquid storage module installed in the middle of the mobile platform; an adjustable conveying module installed at the side end of the mobile platform, and the adjustable conveying module is connected with the liquid storage module; an adjustable nozzle is slidably arranged on the outside of the adjustable conveying module, and when the mobile platform travels in a furrow, the adjustable nozzle is placed on the edge of the field ridge, and the sterilizing liquid is transported to the adjustable nozzle in a highly adaptive adjustment through the liquid storage module, so that the stem and leaves of the potato plant are sprayed with strong wind from bottom to top; and a spraying module is connected and installed at the rear end of the liquid storage module, and the spraying module is used for auxiliary spraying of the potatoes.

[0009] The adjustable nozzle includes a U-shaped tube, a plugging head, a nozzle component, a reset rotating component, and a drag reducing component. The U-shaped tube is slidably arranged in the adjustable conveying module. The lower end of the U-shaped tube is provided with a plugging head. The nozzle component and the U-shaped tube are connected by a reset rotating component. A flexible tube is connected between the inner cavity of the nozzle component and the U-shaped tube. The drag reducing component is installed at the lower end of the nozzle component.

[0010] As a preferred technical solution of the present invention, the liquid storage module includes a liquid storage frame, a delivery pump assembly and a manifold. The liquid storage frame is installed in the middle of the mobile platform, and the delivery pump assembly is installed between the liquid storage frame and the manifold.

[0011] As a preferred technical solution of the present invention, the adjustable conveying module includes a connecting seat, which is installed on a mobile platform, a conveying cavity is opened inside the connecting seat, and a connecting pipe is connected between one end of the conveying cavity and the manifold; a telescopic tube is connected between the conveying cavity and the connecting cavity opened by the connecting head, a sliding rod is installed at the lower end of the side wall of the connecting head, the sliding rod is horizontally slidably arranged in the connecting seat, and the U-shaped tube is slidably arranged in the connecting head; an air pump is built into the connecting head, a T-shaped opening is opened at the lower end of the connecting head, the air pump is connected to the transverse opening part of the T-shaped opening, and the transverse opening part of the T-shaped opening faces the direction of the mobile platform, the plugging head is located inside the longitudinal opening of the T-shaped opening, an air cavity is opened inside the drag reduction component, the air cavity is connected to the lower end of the T-shaped opening by a hose, and an ejection hole is opened at the upper end of the air cavity.

[0012] As a preferred technical solution of the present invention, a diffused spray hole structure is provided on the nozzle component, and the drag reducing component is an arc-shaped structure.

[0013] As a preferred technical solution of the present invention, an inlet is opened on the inner side of the upper end of the U-shaped tube, and the inlet at the initial height is staggered with the connecting cavity.

[0014] As a preferred technical solution of the present invention, the reset rotating part includes a rotating shaft, a connecting sleeve and a torque spring. The side wall of the nozzle part is installed with a rotating shaft, the rotating shaft is connected to the U-shaped tube through a bearing, and the outer sleeve of the rotating shaft is provided with a torque spring. One end of the torque spring is connected to the rotating shaft, and the other end of the torque spring is connected to the connecting sleeve. The connecting sleeve is installed on the outer wall of the U-shaped tube, and the rotating shaft and the connecting sleeve are coaxially arranged.

[0015] As a preferred technical solution of the present invention, the spray module includes a diverter head and a diverter pipe, and the diverter head is installed between the diverter pipe and the converging pipe.

[0016] As a preferred technical solution of the present invention, the diverter head includes an adapter and a blocking plate. The adapter is connected to the manifold. Interfaces are provided on the left and right sides of the adapter, and the interfaces are docked with the diverter tube. A blocking plate is slidingly provided inside the adapter. A reset spring is connected between the blocking plate and the adapter, and the blocking plate in the initial position separates the interface position from the manifold.

[0017] In summary, this application includes the following beneficial technical effects:

[0018] The present invention discloses a sterilizing spray device for preventing and treating potato stem canker. The present application adopts a spraying method for preventing and treating potato stem canker. Compared with the prior art, the present application adopts a strong wind spraying method from bottom to top. Specifically, the adjustable nozzle is always in contact with the upper surface position of the edge of the field ridge during movement, so that the adjustable nozzle is always in a relatively fixed position with the soil layer. Then, the sterilizing liquid is sprayed onto the stem and leaves through the effect of upper spraying + strong wind, which improves the uniformity of the spraying. Moreover, since the adjustable nozzle is always in a relatively fixed position with the soil layer, the spraying position of the adjustable nozzle and the plant is always relatively consistent, which improves the uniformity of the spraying density and reduces the possibility of poor spraying effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the structure of the present invention;

[0020] Figure 2 is an overall top view of the present invention;

[0021] Figure 3 The present invention Figure 2 AA section view;

[0022] Figure 4 It is a cross-sectional view of the U-shaped tube, the nozzle component, the reset rotating component, and the drag reducing component of the present invention;

[0023] Figure 5 is a cross-sectional view of the diverter head of the present invention;

[0024] Figure 6 The present invention Figure 3 A local enlarged view of point X;

[0025] Figure 7 The present invention Figure 1 A partial enlarged view of point Y.

[0026] Explanation of the reference numerals: 1. Mobile platform; 2. Liquid storage module; 3. Adjustable delivery module; 4. Adjustable nozzle; 5. Spraying module; 21. Liquid storage frame; 22. Delivery pump assembly; 23. Manifold; 31. Connecting seat; 32. Telescopic tube; 33. Connecting head; 34. Air pump; 35. T-port; 41. U-tube; 42. Plug head; 43. Sprinkler component; 44. Reset rotating component; 45. Drag reducing component; 51. Diverter head; 52. Diverter tube; 441. Rotating shaft; 442. Connecting sleeve; 443. Torque spring; 511. Adapter; 512. Plug plate. DETAILED DESCRIPTION

[0027] The following is combined with Figure 1-Figure 7 This application is described in further detail.

[0028] The embodiment of the present application discloses a sterilizing spray device for preventing and controlling potato stem canker. The present application adopts a spraying method for preventing and controlling potato stem canker. The adjustable nozzle 4 is always in contact with the upper surface of the edge of the field ridge during movement, so that the adjustable nozzle 4 is always in the stem position of the plant. The bottom-up spraying method and strong wind effect are adopted to spray the stems and leaves of the plant. Compared with the top-down spraying, the spraying degree is more comprehensive.

[0029] Reference Figure 1-Figure 3 As shown, a sterilization spraying device for the prevention and treatment of potato stem canker disease disclosed in this embodiment includes a mobile platform 1, a liquid storage module 2, an adjustable conveying module 3, an adjustable nozzle 4, and a spraying module 5. The mobile platform 1 is a fixed foundation, the liquid storage module 2 is installed in the middle of the mobile platform 1, the adjustable conveying module 3 is installed at the side end of the mobile platform 1, and the adjustable conveying module 3 is connected to the liquid storage module 2. The adjustable nozzle 4 is slidably arranged on the outside of the adjustable conveying module 3. When the mobile platform 1 travels in the ridge ditch, the adjustable nozzle 4 is placed on the edge of the field ridge, and the sterilization liquid is transported to the adjustable nozzle 4 in the height adaptability adjustment through the liquid storage module 2, so that the stems and leaves of the potato plants are sprayed from bottom to top in a strong wind manner. The spraying module 5 is connected and installed at the rear end of the liquid storage module 2, and the spraying module 5 is used for auxiliary spraying of potatoes.

[0030] During the actual spraying process, the mobile platform 1 is used to drive the application to move in the ridge. During the movement, the adjustable nozzle 4 is always placed on the edge of the ridge, so as to move up and down following the edge of the ridge. At this time, the adjustable nozzle 4 is always aimed at the stem of the plant and the leaves above. Since the adjustable nozzle 4 is not in the lowest position, the adjustable nozzle 4 is connected to the adjustable delivery module 3 at this time, and the sterilizing liquid is delivered to the adjustable nozzle 4 through the liquid storage module 2 and sprayed out, so as to spray the stems and leaves of the potato plants from bottom to top, and cooperate with the wind to realize strong wind spraying operation.

[0031] Reference Figure 3 As shown, the liquid storage module 2 includes a liquid storage frame 21, a delivery pump assembly 22 and a manifold 23. The liquid storage frame 21 is installed in the middle of the mobile platform 1, and the delivery pump assembly 22 is installed between the liquid storage frame 21 and the manifold 23.

[0032] The sterilizing liquid in the liquid storage frame 21 is pumped to the manifold 23 by the delivery pump assembly 22 and then diverted for delivery.

[0033] Reference Figure 1 , Figure 3 , Figure 6 As shown, the adjustable conveying module 3 includes a connecting seat 31, a telescopic tube 32, a connector 33, an air pump 34, and a T-shaped port 35. The connecting seat 31 is installed on the mobile platform 1. A conveying cavity is provided inside the connecting seat 31. A connecting tube is connected between one end of the conveying cavity and the manifold 23. The telescopic tube 32 is connected between the conveying cavity and the connecting cavity 331 provided by the connector 33. A sliding rod is installed at the lower end of the side wall of the connector 33. The sliding rod is horizontally slidably arranged in the connecting seat 31. The air pump 34 is built in the connector 3 3, a T-shaped opening 35 is provided at the lower end of the connector 33, the air delivery pump 34 is connected to the transverse opening of the T-shaped opening 35, and the transverse opening of the T-shaped opening 35 faces the direction of the mobile platform 1, the plugging head 42 is located inside the longitudinal opening of the T-shaped opening 35, an air cavity is provided inside the drag reducing member 45, the air cavity is connected to the lower end of the T-shaped opening 35 by a hose, an ejection hole is provided at the upper end of the air cavity, and the plugging head 42 at the lowest position (initial position) blocks the lower opening of the T-shaped opening 35, so that the air delivery pump 34 cannot deliver air to the hose.

[0034] Reference Figure 4 , Figure 6 , Figure 7 As shown, the adjustable nozzle 4 includes a U-shaped tube 41, a plugging head 42, a nozzle component 43, a reset rotating component 44, and a drag reducing component 45. The U-shaped tube 41 is slidably arranged in the adjustable conveying module 3, and the plugging head 42 is arranged at the lower end of the U-shaped tube 41. The nozzle component 43 is connected to the U-shaped tube 41 through the reset rotating component 44. A flexible tube is connected between the inner cavity of the nozzle component 43 and the U-shaped tube 41, and the drag reducing component 45 is installed at the lower end of the nozzle component 43.

[0035] In the actual operation process, the length of the telescopic tube 32 is adjusted so that the nozzle member 43 can be placed on the edge of the ditch (at this time, the height of the U-shaped tube 41 has been increased and is not at the lowest position. At this time, the U-shaped tube 41 is aligned and connected with the connecting cavity 331). As the mobile platform 1 moves in the ditch, the U-shaped tube 41 moves up and down. At the same time, due to the unevenness of the soil surface of the ridge, in the case of the longitudinal height difference, there is also a height difference on the left and right. At this time, since the nozzle member 43 is in a rotating connection, the nozzle member 43 can move up and down and adjust the left and right angles during the movement to make it more It is fitted to the upper soil surface of the edge of the ridge, and the plugging head 42 is driven to move synchronously during the upward movement of the U-shaped tube 41 so that the T-shaped port 35 is connected to the hose. At this time, the gas output by the air pump 34 is ejected from the lateral port part of the T-shaped port 35 (the tire position in the mobile platform 1 is auxiliaryly cleaned by air blowing) and enters the hose (and then ejected from the ejection hole of the drag reduction component 45, with the air blowing direction from bottom to top). Through the bottom-up spraying in the nozzle component 43 + strong wind blowing upward, the stems and leaves of the plants are sprayed with strong winds, thereby improving the comprehensiveness of the spraying.

[0036] Reference Figure 6-Figure 7 As shown, the nozzle member 43 is provided with a diffuse spray hole structure to increase the spraying area, and the drag reducing member 45 is an arc-shaped structure, specifically, an arc-shaped structure with the front and rear ends facing upward and the middle part concave, which is beneficial for the drag reducing member 45 to pass through various rugged soil surfaces.

[0037] Reference Figure 6 As shown, an inlet is opened on the inner side of the upper end of the U-shaped tube 41, and the inlet at the initial height is offset from the connecting cavity 331, which is in a blocked state. When the U-shaped tube 41 moves upward relative to the connecting head 33, the inlet and the connecting cavity 331 are connected to allow sterilizing liquid to pass through.

[0038] Reference Figure 4 , Figure 7 As shown, since the nozzle component 43 and the U-shaped tube 41 are rotationally connected, in order to keep the nozzle component 43 in a reset trend during rotation, a reset rotating component 44 is specially designed. The specific structure is that the reset rotating component 44 includes a rotating shaft 441, a connecting sleeve 442 and a torque spring 443. The side wall of the nozzle component 43 is installed with a rotating shaft 441, and the rotating shaft 441 is connected to the U-shaped tube 41 through a bearing. The outer sleeve of the rotating shaft 441 is provided with a torque spring 443, one end of the torque spring 443 is connected to the rotating shaft 441, and the other end of the torque spring 443 is connected to the connecting sleeve 442. The connecting sleeve 442 is installed on the outer wall of the U-shaped tube 41, and the rotating shaft 441 and the connecting sleeve 442 are coaxially arranged.

[0039] In the actual operation process, due to the existence of the torque spring 443, the rotating shaft 441 always maintains a tendency to rotate to the initial angle.

[0040] Reference Figure 1 As shown, the spray module 5 includes a diverter head 51 and a diverter pipe 52 , and the diverter head 51 is installed between the diverter pipe 52 and the converging pipe 23 .

[0041] Reference Figure 5 As shown, the diverter 51 includes an adapter 511 and a blocking plate 512. The adapter 511 is connected to the manifold 23. Interfaces are provided on the left and right sides of the adapter 511, and the interfaces are connected to the diverter 52. A blocking plate 512 is slidingly provided inside the adapter 511. A return spring is connected between the blocking plate 512 and the adapter 511. The return spring plays a role of elastic return, and the blocking plate 512 in the initial position separates the interface position from the manifold 23.

[0042] During the actual spraying process, the liquid inside the liquid storage module 2 is partially transported to the adapter 511, and the blocking plate 512 is pushed open by the hydraulic pressure so that the interface position is connected to the manifold 23, so that the sterilizing liquid is smoothly transported to the diversion pipe 52 and then sprayed out.

[0043] The implementation principle of this embodiment is:

[0044] Step 1: The mobile platform 1 drives the application to move in the ditch;

[0045] Step 2: During the movement, the adjustable nozzle 4 is always placed in a close fit on the edge of the ridge, so as to move up and down along with the edge of the ridge. At this time, the adjustable nozzle 4 is always aimed at the stem of the plant and the leaves above. Since the adjustable nozzle 4 is not in the lowest position, the adjustable nozzle 4 is connected to the adjustable delivery module 3 at this time, and the sterilizing liquid is delivered to the adjustable nozzle 4 through the liquid storage module 2 and sprayed out, so as to spray the stems and leaves of the potato plants from bottom to top, and cooperate with the wind to realize strong wind spraying operation.

[0046] The above description is only by way of illustration of certain exemplary embodiments of the present invention. It is undoubted that those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A sterilizing spray device for preventing and treating potato stem canker, characterized in that: include: Mobile platform (1); A liquid storage module (2) installed in the middle of the mobile platform (1); An adjustable conveying module (3) is installed at the side end of the mobile platform (1), and the adjustable conveying module (3) is connected to the liquid storage module (2); The adjustable nozzle (4) is slidably arranged on the outside of the adjustable conveying module (3) up and down. When the mobile platform (1) travels in the furrow, the adjustable nozzle (4) is placed on the edge of the ridge. The sterilizing liquid is conveyed to the adjustable nozzle (4) in the highly adaptive adjustment through the liquid storage module (2), so that the stems and leaves of the potato plants are sprayed from bottom to top in a strong wind manner. A spraying module (5) is connected and installed at the rear end of the liquid storage module (2), and the spraying module (5) is used for auxiliary spraying of potatoes; The adjustable spray head (4) comprises a U-shaped tube (41), a plugging head (42), a spray head component (43), a reset rotating component (44), and a drag reducing component (45); the U-shaped tube (41) is slidably arranged in the adjustable conveying module (3) up and down; the plugging head (42) is arranged at the lower end of the U-shaped tube (41); the spray head component (43) and the U-shaped tube (41) are connected via the reset rotating component (44); a flexible tube is connected between the inner cavity of the spray head component (43) and the U-shaped tube (41); and the drag reducing component (45) is installed at the lower end of the spray head component (43); The liquid storage module (2) comprises a liquid storage frame (21), a delivery pump assembly (22) and a manifold (23); the liquid storage frame (21) is installed in the middle of the mobile platform (1); the delivery pump assembly (22) is installed in communication between the liquid storage frame (21) and the manifold (23); The adjustable conveying module (3) comprises: A connecting seat (31) is installed on the mobile platform (1), a conveying cavity is provided inside the connecting seat (31), and a connecting pipe is connected between one end of the conveying cavity and the manifold (23); The telescopic tube (32) is connected between the conveying cavity and the connecting cavity (331) opened in the connecting head (33). A sliding rod is installed at the lower end of the side wall of the connecting head (33). The sliding rod is horizontally slidably arranged in the connecting seat (31). The U-shaped tube (41) is vertically slidably arranged in the connecting head (33). An air delivery pump (34) is built into the connector (33). A T-shaped opening (35) is provided at the lower end of the connector (33). The air delivery pump (34) is connected to the transverse opening of the T-shaped opening (35), and the transverse opening of the T-shaped opening (35) faces the direction of the mobile platform (1). A plug (42) is located inside the longitudinal opening of the T-shaped opening (35). An air cavity is provided inside the resistance reducing member (45). A hose is provided between the air cavity and the lower end of the T-shaped opening (35), and a spray hole is provided at the upper end of the air cavity.

2. A sterilizing spray device for preventing and treating potato stem canker according to claim 1, characterized in that: The nozzle component (43) is provided with a diffused spray hole structure, and the drag reduction component (45) is an arc-shaped structure.

3. A sterilizing spray device for preventing and treating potato stem canker according to claim 1, characterized in that: An inlet is provided on the inner side of the upper end of the U-shaped tube (41), and the inlet at the initial height is staggered with the connecting cavity (331).

4. A sterilizing spray device for preventing and treating potato stem canker according to claim 1, characterized in that: The reset rotating member (44) comprises a rotating shaft (441), a connecting sleeve (442) and a torque spring (443). The rotating shaft (441) is installed on the side wall of the nozzle member (43). The rotating shaft (441) is connected to the U-shaped tube (41) through a bearing. The outer sleeve of the rotating shaft (441) is provided with a torque spring (443). One end of the torque spring (443) is connected to the rotating shaft (441), and the other end of the torque spring (443) is connected to the connecting sleeve (442). The connecting sleeve (442) is installed on the outer wall of the U-shaped tube (41). The rotating shaft (441) and the connecting sleeve (442) are coaxially arranged.

5. A sterilizing spray device for preventing and treating potato stem canker according to claim 1, characterized in that: The spray module (5) comprises a flow diverter (51) and a flow diverter pipe (52), and the flow diverter pipe (52) is connected to the converging pipe (23) and the flow diverter head (51) is installed therebetween.

6. A sterilizing spray device for preventing and treating potato stem canker according to claim 5, characterized in that: The diverter head (51) comprises an adapter (511) and a blocking plate (512). The adapter (511) is connected to the manifold (23). The left and right sides of the adapter (511) are provided with interfaces, which are connected to the diverter tube (52). The blocking plate (512) is slidably arranged inside the adapter (511). A return spring is connected between the blocking plate (512) and the adapter (511), and the blocking plate (512) in the initial position separates the interface position from the manifold (23).

Citation Information

Patent Citations

  • Incubator for virus-free seedling of seed potato stem tip

    CN218125834U

  • Potato plant leaf back pesticide spraying device

    CN218977823U