A device for washing and picking up raw edible mushrooms

The reciprocating motion mechanism driven by an electric motor, in conjunction with a hydraulic rod, causes the cleaning mesh frame and cover plate to shake and rise, solving the problem of insufficient cleaning of edible fungi and achieving efficient cleaning and convenient collection of edible fungi.

CN224539390UActive Publication Date: 2026-07-24HENAN XIZHOU BAILING ECOLOGICAL AGRI TECH CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
HENAN XIZHOU BAILING ECOLOGICAL AGRI TECH CO LTD
Filing Date
2024-10-09
Publication Date
2026-07-24

AI Technical Summary

Technical Problem

In existing rinsing and scooping devices for edible fungi processing, edible fungi may pile up tightly during the cleaning process, preventing water from penetrating every corner. As a result, some edible fungi are not thoroughly cleaned, leaving behind dirt and impurities.

Method used

A device was designed that includes a motor, a reciprocating motion mechanism, a cleaning tank, a cleaning mesh frame, and a mesh cover. The motor drives the reciprocating motion mechanism to make the cleaning mesh frame and mesh cover swing left and right to ensure that the edible fungi are in full contact with water. The mesh frame is raised and lowered by an electric hydraulic rod to facilitate the collection of edible fungi.

Benefits of technology

This method ensures thorough cleaning of edible fungi, avoids cleaning dead spots caused by accumulation, improves cleaning effect, and facilitates the collection of cleaned edible fungi.

✦ Generated by Eureka AI based on patent content.

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Abstract

The utility model discloses a kind of edible fungi primary processing flush fishing devices, it is related to edible fungi processing technical field, including cleaning tank, the lower end of the cleaning tank is fixedly connected with motor, the motor output shaft passes through the lower end of cleaning tank and is fixedly connected with reciprocating mechanism.The utility model can drive two concave plates and two supporting plates to reciprocate in left-right direction by the intercoordination between the motor, T-shaped sliding sleeve, fixed rod two, T-shaped sliding block, concave rod, fixed rod three and connecting sleeve, in this process, under the cooperation of the overlap plate, limiting rod, plug rod, shell and L-shaped limiting plate, it can drive cleaning net frame and mesh cover to move, so that edible fungi can shake inside cleaning net frame, ensure that edible fungi can be in contact with water fully, so as to improve the flushing effect of the device on edible fungi.
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Description

Technical Field

[0001] This utility model relates to a rinsing and scooping device, and more particularly to a rinsing and scooping device for the initial processing of edible fungi. Background Technology

[0002] Edible fungi refer to large, edible mushrooms (macrofungi), commonly known as mushrooms. Common edible fungi include: shiitake mushrooms, straw mushrooms, button mushrooms, wood ear mushrooms, silver ear mushrooms, lion's mane mushrooms, white lingzhi mushrooms, and porcini mushrooms. When processing edible fungi, a rinsing device is needed to clean them.

[0003] Currently, the rinsing and scooping devices used in edible mushroom processing still have some defects and shortcomings in use. The specific areas that need improvement are as follows:

[0004] In existing edible mushroom processing rinsing and scooping devices, the mushrooms may pile up tightly during the cleaning process, preventing water from penetrating every corner of the mushrooms. As a result, some parts of the mushrooms may not be thoroughly cleaned and may still have dirt and impurities remaining, leading to poor cleaning effect of the device. Utility Model Content

[0005] The purpose of this utility model is to provide a primary processing rinsing and scooping device for edible fungi, in order to solve the problem mentioned in the background art that in the process of cleaning edible fungi, the fungi may be tightly packed together, which prevents the water flow from penetrating smoothly to every corner of the fungi. As a result, some parts of the fungi may not be cleaned thoroughly and may still have dirt and impurities remaining, thus leading to poor cleaning effect of the device.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a primary processing rinsing and scooping device for edible fungi, comprising a washing tank, a motor fixedly connected to the lower end of the washing tank, the output shaft of the motor passing through the lower end of the washing tank and fixedly connected to a reciprocating motion mechanism, the front and rear ends of the reciprocating motion mechanism being fixedly connected to the front and rear sides of the interior of the washing tank respectively, an installation mechanism being provided on the reciprocating motion mechanism, overlapping plates being provided on both the left and right sides of the installation mechanism, and two limiting holes being opened inside each of the two overlapping plates, two sleeves being fixedly connected to the upper ends of each of the two overlapping plates, and the four sleeves being inserted into the front and rear sides of the installation mechanism respectively through two insertion holes opened inside them;

[0007] The four sleeves are respectively fitted with four L-shaped limiting plates. Each of the four L-shaped limiting plates is inserted into the front and rear sides of the installation mechanism through another insertion hole opened inside. The upper side of the installation mechanism is fitted with two fixing rods. The relatively close ends of the two overlapping plates are fixedly connected to the cleaning mesh frame. The relatively close ends of the four L-shaped limiting plates are fixedly connected to the left and right ends of the mesh cover plate.

[0008] As a preferred technical solution of this utility model, L-shaped plates are fixedly connected to the left and right ends of the two fixed rods, the upper sides of the four L-shaped plates are fixedly connected to the upper ends of the four electric hydraulic rods, and the lower ends of the four electric hydraulic rods are fixedly connected to fixed plates.

[0009] As a preferred technical solution of this utility model, the relatively close ends of the four fixed plates are respectively fixedly connected to the front and rear ends of the cleaning box, the lower end of the cleaning box is fixedly connected to two support legs, the right end of the cleaning box is provided with a drain pipe and a drain valve is provided on the drain pipe, the upper side of the four L-shaped plates is respectively fixedly connected to four limiting rods, and the four limiting rods are respectively movably connected to four limiting blocks.

[0010] As a preferred technical solution of this utility model, the relatively distant ends of the four limiting blocks are respectively fixedly connected to the front and rear sides of the inside of the cleaning tank, the lower end of the mesh cover plate overlaps with the cleaning mesh frame, and both the reciprocating motion mechanism and the installation mechanism have been treated with waterproof and rustproof measures.

[0011] As a preferred embodiment of this utility model, the reciprocating motion mechanism includes a rotating plate, the front end of which is fixedly connected to the output shaft of a motor, and the rotating plate is movably connected to a T-shaped sliding sleeve through a connecting hole opened inside its rear end.

[0012] As a preferred technical solution of this utility model, the T-shaped sliding sleeve is sleeved with the second fixed rod, and the front and rear ends of the second fixed rod are fixedly connected with T-shaped sliders. The two T-shaped sliders are movably connected to the two concave rods respectively through the circular holes opened inside them.

[0013] As a preferred technical solution of this utility model, the relatively distant ends of the two concave rods are respectively fixedly connected to the front and rear sides of the inside of the cleaning tank, and the upper ends of the two T-shaped sliders are each fixedly connected to two fixing rods three, and the four fixing rods three are all sleeved with the installation mechanism.

[0014] As a preferred embodiment of the present invention, the installation mechanism includes two concave plates, and each of the two concave plates is fixedly connected to an L-shaped plate and two connecting sleeves at their relatively far ends. The four connecting sleeves are respectively sleeved with four fixing rods. Each of the two L-shaped plates is sleeved with two fixing rods through a circular hole opened inside its upper end.

[0015] As a preferred embodiment of this utility model, each of the two concave plates is movably connected to four insert rods through two circular holes inside them. Each of the four insert rods is fitted with a spring. The relatively close ends of the four springs are fixedly connected to the two concave plates, and the relatively far ends of the four springs are fixedly connected to the relatively far sides of the four insert rods. The four insert rods are respectively inserted into four housings and four L-shaped limiting plates. The lower ends of the two concave plates are respectively fixedly connected to two support plates.

[0016] As a preferred embodiment of this utility model, the upper ends of the two support plates are respectively connected to the two overlapping plates, and the upper ends of the two support plates are fixedly connected to two limiting rods. The four limiting rods are sleeved with the two overlapping plates, each of which has two limiting holes.

[0017] Compared with the prior art, the beneficial effects of this utility model are:

[0018] This invention, through the coordinated operation of a motor, T-shaped sliding sleeve, second fixing rod, T-shaped slider, concave rod, third fixing rod, and connecting sleeve, drives two concave plates and two support plates to reciprocate in the left-right direction. During this process, the overlapping plate, limiting rod, insert rod, sleeve, and L-shaped limiting plate work together to move the cleaning mesh frame and mesh cover, allowing the edible fungi to sway inside the cleaning mesh frame and ensuring sufficient contact between the fungi and water, thereby improving the rinsing effect of the device. After rinsing the fungi, the electric hydraulic rod, L-shaped plate one, fixed rod one, L-shaped plate two, concave plate, support plate, and overlapping plate move the cleaning mesh frame upward a certain distance. Then, with the cooperation of the insert rod, overlapping plate, spring, and limiting rod, the cleaning mesh frame can be easily removed from the device, facilitating the collection and processing of the cleaned edible fungi. Attached Figure Description

[0019] Figure 1 This is a front cross-sectional three-dimensional structural schematic diagram of the present invention;

[0020] Figure 2 This is a three-dimensional structural diagram of the right-side cross-section of this utility model;

[0021] Figure 3 This is a front-view three-dimensional structural diagram of the present invention;

[0022] Figure 4 This is a front-view three-dimensional structural diagram of the cleaning frame of this utility model;

[0023] Figure 5This is a front-view three-dimensional structural diagram of the mesh cover plate of this utility model;

[0024] Figure 6 A three-dimensional structural diagram of the reciprocating motion mechanism of this utility model;

[0025] Figure 7 This is a front-view three-dimensional structural diagram of the installation mechanism of this utility model.

[0026] In the diagram: 1. Cleaning tank; 2. Installation mechanism; 21. Limiting rod; 22. Support plate; 23. L-shaped plate II; 24. Spring; 25. Insert rod; 26. Concave plate; 27. Connecting sleeve; 3. Overlap plate; 4. Cleaning mesh frame; 5. Fixing plate; 6. Motor; 7. Reciprocating motion mechanism; 71. Concave rod; 72. Fixing rod III; 73. T-shaped slider; 74. Fixing rod II; 75. T-shaped sliding sleeve; 76. Rotating plate; 8. Mesh cover plate; 9. Shell; 10. L-shaped limiting plate; 11. L-shaped plate I; 12. Electro-hydraulic rod; 13. Fixing rod I; 14. Limiting rod; 15. Limiting block. Detailed Implementation

[0027] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0028] like Figure 1-7As shown, this utility model provides a technical solution: a primary processing rinsing and scooping device for edible fungi, including a washing tank 1. A motor 6 is fixedly connected to the lower end of the washing tank 1. The output shaft of the motor 6 passes through the lower end of the washing tank 1 and is fixedly connected to a reciprocating motion mechanism 7. The front and rear ends of the reciprocating motion mechanism 7 are fixedly connected to the front and rear sides of the interior of the washing tank 1, respectively. An installation mechanism 2 is provided on the reciprocating motion mechanism 7. Overlapping plates 3 are provided on both the left and right sides of the installation mechanism 2. Two limiting holes are opened inside each of the two overlapping plates 3. Two housings 9 are fixedly connected to the upper ends of each of the two overlapping plates 3. The four housings 9 are connected to the front end of the installation mechanism 2 through two insertion holes opened inside them. The rear two sides are inserted, and the rotation of the output shaft of the motor 6, under the action of the set reciprocating motion mechanism 7, can drive the installation mechanism 2 to reciprocate in the left and right directions. During the reciprocating motion of the installation mechanism 2 in the left and right directions, under the action of the set overlapping plate 3, the cleaning mesh frame 4 can move accordingly. Then, under the action of the water added inside the cleaning tank 1, the edible fungi inside the cleaning mesh frame 4 can be rinsed. This effectively avoids the situation where the edible fungi may be tightly packed together during the cleaning process, which would prevent the water flow from penetrating smoothly to every corner of the edible fungi, thus preventing the edible fungi from being thoroughly cleaned.

[0029] Four sleeves 9 are respectively fitted with four L-shaped limiting plates 10. Each of the four L-shaped limiting plates 10 is inserted into the front and rear sides of the installation mechanism 2 through another insertion hole opened inside. The upper side of the installation mechanism 2 is fitted with two fixing rods 13. The relatively close ends of the two overlapping plates 3 are fixedly connected to the cleaning mesh frame 4. The relatively close ends of the four L-shaped limiting plates 10 are fixedly connected to the left and right ends of the mesh cover plate 8. Through the mutual cooperation between the sleeves 9, L-shaped limiting plates 10, overlapping plates 3 and installation mechanism 2, the installation and fixing effect of the mesh cover plate 8 and the cleaning mesh frame 4 can be quickly achieved. The mutual cooperation between the L-shaped limiting plates 10 and sleeves 9 can limit the installation position of the mesh cover plate 8. The fixing rods 13 can increase the stability of the installation mechanism 2 during reciprocating motion.

[0030] Two fixed rods 13 are fixedly connected to L-shaped plates 11 at both ends. The upper sides of the four L-shaped plates 11 are fixedly connected to the upper ends of the four electric hydraulic rods 12. The lower ends of the four electric hydraulic rods 12 are fixedly connected to fixed plates 5. The relatively close ends of the four fixed plates 5 are fixedly connected to the front and rear ends of the cleaning tank 1. The upper sides of the four L-shaped plates 11 are fixedly connected to the four limiting rods 14. The four limiting rods 14 are movably connected to the four limiting blocks 15. The relatively far ends of the four limiting blocks 15 are fixedly connected to the front and rear sides of the interior of the cleaning tank 1. The lower end of the mesh cover 8 overlaps with the cleaning mesh frame 4. Both the reciprocating motion mechanism 7 and the installation mechanism 2 are waterproof. Rust removal is performed after rinsing the edible fungi. Four electric hydraulic rods 12 are activated to move four L-shaped plates 11 upwards, which in turn moves two fixed rods 13 upwards. This upward movement of the fixed rods 13 moves the mounting mechanism 2 upwards, which in turn moves the cleaning mesh frame 4 upwards. After the cleaning mesh frame 4 moves upwards a certain distance, it is removed from the mounting mechanism 2, allowing for easy collection of the cleaned edible fungi. The cooperation between the limiting rods 14 and the limiting blocks 15 increases the stability of the L-shaped plates 11 during movement.

[0031] The reciprocating motion mechanism 7 includes a rotating plate 76. The front end of the rotating plate 76 is fixedly connected to the output shaft of the motor 6. The rotating plate 76 is movably connected to a T-shaped sliding sleeve 75 through a connecting hole inside its rear end. The T-shaped sliding sleeve 75 is sleeved with a fixed rod 74. T-shaped sliders 73 are fixedly connected to both ends of the fixed rod 74. The two T-shaped sliders 73 are movably connected to two concave rods 71 ​​through circular holes inside them. The relatively far ends of the two concave rods 71 ​​are fixedly connected to the front and rear sides inside the cleaning tank 1. Two fixed rods 72 are fixedly connected to the upper ends of the two T-shaped sliders 73. All four fixed rods 72 are sleeved with the mounting mechanism 2. The rotation of the output shaft of the motor 6 drives the rotating plate 76 to rotate. Under the action of the T-shaped sliding sleeve 75 and the fixed rod 74, the two T-shaped sliders 73 and the four fixed rods 72 can achieve the effect of reciprocating in the left and right directions. The concave rods 71 ​​can limit the movement direction of the T-shaped sliders 73.

[0032] The mounting mechanism 2 includes two concave plates 26. Each concave plate 26 has an L-shaped plate 23 and two connecting sleeves 27 fixedly connected to its relatively far ends. The four connecting sleeves 27 are respectively sleeved with four fixing rods 72. Each L-shaped plate 23 is sleeved with two fixing rods 13 through circular holes opened inside its upper end. Each concave plate 26 is movably connected to four insert rods 25 through two circular holes opened inside its interior. Each insert rod 25 has a spring 24 sleeved on it. The four insert rods 25 are respectively inserted into four housings 9 and four L-shaped limiting plates 10. The lower ends of the two concave plates 26 are fixedly connected to two support plates 22. The upper ends of the two support plates 22 overlap with two overlapping plates 3. Each support plate 22 has two limiting rods 21 fixedly connected to its upper end. The four limiting rods 21 overlap with two overlapping plates 3, each with two limiting holes opened inside. The plate 3 is sleeved together. During the reciprocating motion of the four fixed rods 72 in the left and right directions, the connecting sleeve 27 can drive the two concave plates 26 and the two support plates 22 to reciprocate in the left and right directions. During the reciprocating motion of the two support plates 22 in the left and right directions, the limiting rod 21, the insert rod 25, the overlapping plate 3, the shell 9 and the L-shaped limiting plate 10 can drive the cleaning mesh frame 4 and the mesh cover plate 8 to move. During the movement of the cleaning mesh frame 4, the edible fungi inside can fully contact the water, thereby improving the cleaning effect of the device on edible fungi. Through the cooperation between the insert rod 25, the limiting rod 21, the overlapping plate 3, the shell 9 and the L-shaped limiting plate 10, the installation and fixing process of the cleaning mesh frame 4 and the mesh cover plate 8 can be quickly achieved.

[0033] The operation steps of this utility model are as follows:

[0034] When using this device to clean edible fungi, first pull the four insert rods 25 away from each other by a certain distance. Then, pull the mesh cover plate 8 upward to remove it from the cleaning mesh frame 4. Next, put an appropriate amount of edible fungi into the cleaning mesh frame 4, and with the cooperation of the insert rods 25, the sleeve 9, and the L-shaped limiting plate 10, fix the mesh cover plate 8 back to the upper end of the cleaning mesh frame 4. After the above operations are completed, add cleaning water into the cleaning tank 1, making sure the water level covers the mesh cover plate 8. Then, start the motor 6 to drive the rotating plate 76 to rotate. Then, under the action of the set T-shaped sliding sleeve 75, T-shaped slider 73, concave rod 71, fixing rod two 74, fixing rod three 72, connecting sleeve 27, and concave plate 26, the two support plates 22 will move back and forth in the left and right directions. At this time, under the action of the set limiting plate 26, the two support plates 22 will move back and forth in the left and right directions. With the cooperation of the positioning rod 21, insertion rod 25, sleeve 9, L-shaped limiting plate 10, and overlapping plate 3, the cleaning mesh frame 4 and mesh cover 8 can be driven to reciprocate in the left and right directions, so that the edible fungi can fully contact the water, improving the cleaning effect of the device on the edible fungi. After the cleaning is completed, the motor 6 is turned off and the four electric hydraulic rods 12 are started to drive the four L-shaped plates 11 to move upward. Then, with the cooperation of the fixed rod 13, L-shaped plate 23, concave plate 26, support plate 22, and overlapping plate 3, the cleaning mesh frame 4 can be moved out of the cleaning box 1. Then, the four insertion rods 25 are pulled apart to a certain distance, so that the cleaning mesh frame 4 and mesh cover 8 can be easily removed from the device, so that the cleaned edible fungi can be easily collected.

[0035] In the description of this utility model, it should be understood that the indicated orientation or positional relationship is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this utility model and simplifying the description, and is not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0036] In this utility model, unless otherwise explicitly specified and limited, for example, it can be a fixed connection, a detachable connection, or an integral part; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components or an interaction between two components. Unless otherwise explicitly limited, those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0037] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A device for rinsing and retrieving edible fungi during initial processing, comprising a washing tank (1), characterized in that: The lower end of the cleaning box (1) is fixedly connected to a motor (6). The output shaft of the motor (6) passes through the lower end of the cleaning box (1) and is fixedly connected to a reciprocating motion mechanism (7). The front and rear ends of the reciprocating motion mechanism (7) are fixedly connected to the front and rear sides of the interior of the cleaning box (1), respectively. An installation mechanism (2) is provided on the reciprocating motion mechanism (7). The left and right sides of the installation mechanism (2) are provided with overlapping plates (3), and two limiting holes are opened in the interior of the two overlapping plates (3). Two sleeves (9) are fixedly connected to the upper end of the two overlapping plates (3). The four sleeves (9) are inserted into the front and rear sides of the installation mechanism (2) through two insertion holes opened in their interiors, respectively. The four sleeves (9) are respectively sleeved with the four L-shaped limiting plates (10). The four L-shaped limiting plates (10) are respectively inserted into the front and rear sides of the installation mechanism (2) through another insertion hole opened inside them. The upper side of the installation mechanism (2) is sleeved with the two fixing rods (13). The relatively close ends of the two overlapping plates (3) are fixedly connected to the cleaning mesh frame (4). The relatively close ends of the four L-shaped limiting plates (10) are respectively fixedly connected to the left and right ends of the mesh cover plate (8).

2. The edible fungi primary processing rinsing and scooping device according to claim 1, characterized in that: The left and right ends of the two fixed rods (13) are fixedly connected to L-shaped plates (11), the upper sides of the four L-shaped plates (11) are fixedly connected to the upper ends of the four electric hydraulic rods (12), and the lower ends of the four electric hydraulic rods (12) are fixedly connected to fixed plates (5).

3. The edible fungi primary processing rinsing and scooping device according to claim 2, characterized in that: The relatively close ends of the four fixed plates (5) are respectively fixedly connected to the front and rear ends of the cleaning tank (1), the upper sides of the four L-shaped plates (11) are respectively fixedly connected to the four limiting rods (14), and the four limiting rods (14) are respectively movably connected to the four limiting blocks (15).

4. The edible fungi primary processing rinsing and scooping device according to claim 3, characterized in that: The four limiting blocks (15) are respectively fixedly connected to the front and rear sides of the inside of the cleaning tank (1). The lower end of the mesh cover (8) overlaps with the cleaning mesh frame (4). The reciprocating motion mechanism (7) and the installation mechanism (2) have both been waterproofed and rustproofed.

5. The edible fungi primary processing rinsing and scooping device according to claim 1, characterized in that: The reciprocating motion mechanism (7) includes a rotating plate (76), the front end of which is fixedly connected to the output shaft of the motor (6), and the rotating plate (76) is movably connected to the T-shaped sliding sleeve (75) through a connecting hole opened inside its rear end.

6. The edible fungi primary processing rinsing and scooping device according to claim 5, characterized in that: The T-shaped sliding sleeve (75) is sleeved with the second fixed rod (74). Both ends of the second fixed rod (74) are fixedly connected with T-shaped sliders (73). The two T-shaped sliders (73) are movably connected to the two concave rods (71) through the circular holes opened inside them.

7. The edible fungi primary processing rinsing and scooping device according to claim 6, characterized in that: The two concave rods (71) are respectively fixedly connected to the front and rear sides of the inside of the cleaning tank (1). The upper ends of the two T-shaped sliders (73) are fixedly connected to two fixing rods (72). All four fixing rods (72) are sleeved with the installation mechanism (2).

8. The edible fungi primary processing rinsing and scooping device according to claim 7, characterized in that: The installation mechanism (2) includes two concave plates (26). The two concave plates (26) are fixedly connected to L-shaped plates (23) and two connecting sleeves (27) at their relatively far ends. The four connecting sleeves (27) are respectively sleeved with four fixing rods (72). The two L-shaped plates (23) are respectively sleeved with two fixing rods (13) through circular holes opened inside their upper ends.

9. The edible fungi primary processing rinsing and scooping device according to claim 8, characterized in that: Both concave plates (26) are movably connected to four insert rods (25) through two circular holes opened inside them. Each of the four insert rods (25) is fitted with a spring (24). The four insert rods (25) are respectively inserted into four housings (9) and four L-shaped limiting plates (10). The lower ends of the two concave plates (26) are respectively fixedly connected to two support plates (22).

10. The edible fungi primary processing rinsing and scooping device according to claim 9, characterized in that: The upper ends of the two support plates (22) are respectively connected to the two overlapping plates (3). The upper ends of the two support plates (22) are fixedly connected to two limiting rods (21). The four limiting rods (21) are sleeved with the two overlapping plates (3) which each have two limiting holes.