A forestry seed cleaning device

Abstract

The present invention relates to the technical field of seed cleaning, and discloses a forestry seed cleaning device, comprising: a cleaning box, a drain pipe is fixedly sleeved at the lower part of one side of the cleaning box, and a drying chamber is fixedly installed at the upper part of one side of the cleaning box; a weed cleaning component is arranged inside the cleaning box, and the weed cleaning component comprises a first telescopic rod, and the first telescopic rod is fixedly installed at the upper part of one side of the inner cavity of the cleaning box. The first rope winding machine on the first square frame is used to reel up the first connecting rope, so as to drive the weed screening basket to rise. Since the weed screening basket is connected to the first wave plate and the second wave plate respectively by the first guide wheel, the shape characteristics of the first wave plate and the second wave plate are used to drive the weed screening basket to move left and right while the weed screening basket rises, so as to facilitate the screening of seeds in the weed screening basket into the seed cleaning screening basket, so that weeds are retained in the weed screening basket, and it is convenient to separate weeds from seeds.

Description

Technical Field

[0001] The invention relates to the technical field of seed cleaning, in particular to a forestry seed cleaning device. Background Art

[0002] In addition to being used as sowing materials, forest seeds can also be eaten, such as chestnuts and red pine; some can be used as medicine, such as arborvitae and privet; some can be used to extract edible oil, such as camellia oil and walnut; some can be used to extract industrial oil, such as tung oil and Chinese tallow tree; some can be used to extract aromatic oil, such as litsea cubeba; some can be used as feed, such as oak, etc. During the collection, harvesting and storage process, seeds will be attached by various pollutants such as soil, dust, and weed seeds. Cleaning can effectively remove these external pollutants and ensure the purity of seeds. When cleaning seeds, weeds in seeds will be removed. When removing weeds in seeds, some dry weeds are fragile and easy to break. It is difficult to clean the broken weeds from the initial screening, resulting in the broken weeds and seeds entering the cleaning process together, resulting in weeds still existing in the seeds after the final cleaning, affecting the purity of the seeds. Summary of the invention

[0003] The purpose of the present invention is to provide a forestry seed cleaning device to solve the problems raised in the above background technology.

[0004] To achieve the above object, the present invention provides the following technical solution: a forestry seed cleaning device, comprising:

[0005] A cleaning box, a drain pipe is fixedly sleeved on the lower part of one side of the cleaning box, and a drying chamber is fixedly installed on the upper part of one side of the cleaning box;

[0006] A weed cleaning assembly is arranged inside the cleaning box, the weed cleaning assembly comprises a first telescopic rod, the first telescopic rod is fixedly installed on the upper part of one side of the inner cavity of the cleaning box, a first square frame is fixedly installed on one end of the first telescopic rod, a first rope winding machine is arranged on the top of the first square frame, a first connecting rope is arranged on the bottom of the first rope winding machine, a weed screening basket is fixedly connected to the bottom end of the first connecting rope, and first guide wheels are arranged on both sides of the weed screening basket;

[0007] The first wave plate and the second wave plate are respectively fixedly mounted on the lower parts of the two sides of the inner cavity of the cleaning box, and the first guide wheels on the two sides of the weed screening basket are respectively in contact with the sides of the first wave plate and the second wave plate that are close to each other.

[0008] As a further improvement of the present invention, a seed cleaning assembly is provided in the inner cavity of the cleaning box, and the seed cleaning assembly includes a guide rod, a second square frame, a second rope winder, a second connecting rope, a seed cleaning and screening basket and a second guide wheel. A guide rod is fixedly installed on the upper part of the inner cavity of the cleaning box, and slide grooves are provided on the front and rear sides of the second square frame. The inner cavity of the slide groove is movably sleeved on the outer side of the guide rod, and a second rope winder is fixedly installed on the top of the second square frame. The bottom of the second rope winder is connected to the second connecting rope, and the bottom end of the second connecting rope is connected to the seed cleaning and screening basket. Second guide wheels are provided on both sides of the seed cleaning and screening basket, and the second guide wheels on both sides of the seed cleaning and screening basket respectively contact with the side where the first wave plate and the second wave plate are close to each other.

[0009] As a further improvement of the present invention, the four corners of the top of the second square frame are each provided with a second rope winding machine, and the second connecting ropes on the four second rope winding machines are respectively connected to the four corners of the top of the seed cleaning and screening basket.

[0010] As a further improvement of the present invention, a moving component is provided on the upper part of the front side of the cleaning box, and the moving component includes a cylinder, an auxiliary plate, a second telescopic rod and a connecting plate. A cylinder is fixedly installed on the upper part of one side of the cleaning box, and the output end of the cylinder is connected to the auxiliary plate, a second telescopic rod is fixedly installed on one side of the auxiliary plate, a connecting plate is fixedly installed on one end of the second telescopic rod, the rear side of the connecting plate is fixedly installed on the front side of the second square frame, and a dryer is fixedly installed on the top of the drying chamber.

[0011] As a further improvement of the present invention, the cylinder is arranged at the front side of the second square frame and the second rope winding machine, and is vertically distributed between the cylinder and the second telescopic rod.

[0012] As a further improvement of the present invention, the front side of the seed cleaning and screening basket is open, a sinking groove is provided on the front side of the bottom of the seed cleaning and screening basket, and the inner cavity of the sinking groove is connected to a movable plate by a rotating shaft.

[0013] As a further improvement of the present invention, the bottom of the sinking trough is located below the bottom of the inner cavity of the seed cleaning and screening basket, and the front and rear sides of the movable plate are respectively in contact with the inner wall of the cleaning box and the inner wall of the sinking trough.

[0014] As a further improvement of the present invention, the drying chamber as a whole is open on the front side, the left side and the top, and a baffle is fixedly installed on the front side of one side of the inner cavity of the drying chamber.

[0015] As a further improvement of the present invention, the four corners of the top of the first square frame are each provided with a first rope winding machine, and the length and width of the weed screening basket are both smaller than the length and width of the seed cleaning and screening basket.

[0016] As a further improvement of the present invention, the first wave plate and the second wave plate are both wavy in shape as a whole, and the concave points on the first wave plate correspond to the convex points on the second wave plate.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] 1. The forestry seed cleaning device is provided with a weed cleaning component through the inner cavity of the cleaning box, and the first connecting rope is wound up by the first rope winding machine on the first square frame to drive the weed screening basket to rise. Since the weed screening basket is respectively connected with the first wave plate and the second wave plate by the first guide wheel, the shape characteristics of the first wave plate and the second wave plate are utilized to drive the weed screening basket to move left and right while the weed screening basket rises, so that the seeds in the weed screening basket can be screened into the seed cleaning screening basket, so that the weeds are retained in the weed screening basket, which is convenient for separating the weeds from the seeds and convenient for subsequent cleaning of the seeds.

[0019] 2. The forestry seed cleaning device is provided with a seed cleaning component in the cleaning box, which drives the second rope winding machine to reel in the second connecting rope, thereby driving the seed cleaning and screening basket to rise, and the seed cleaning and screening basket is connected with the first wave plate and the second wave plate by the second guide wheel. When the seed cleaning and screening basket rises, the shape characteristics of the first wave plate and the second wave plate are utilized to drive the seed cleaning and screening basket to move left and right, so as to facilitate the discharge of impurities smaller than the seeds from the bottom of the seed cleaning and screening basket, so that only seeds remain in the seed cleaning and screening basket.

[0020] 3. The forestry seed cleaning device is provided with a sinking trough and a movable plate on the front side of the seed cleaning and screening basket. When the seed cleaning and screening basket is transported to the drying chamber for drying by a moving component, the seed cleaning and screening basket is moved to a position between one side of the drying chamber and the baffle, so that there is no limiting component on the front baffle of the seed cleaning and screening basket, which is convenient for discharging the cleaned and dried seeds in the seed cleaning and screening basket. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0022] Figure 1 This is a schematic diagram of the overall structure of a forestry seed cleaning device of the present invention;

[0023] Figure 2 A partial diagram of a forestry seed cleaning device of the present invention;

[0024] Figure 3 A forestry seed cleaning device according to the present invention Figure 2 Enlarged view of point A in the middle;

[0025] Figure 4 A cross-sectional view of a cleaning box of a forestry seed cleaning device of the present invention;

[0026] Figure 5 A forestry seed cleaning device according to the present invention Figure 4 Enlarged view of point B in the middle;

[0027] Figure 6 The present invention is a schematic diagram of a movable plate structure of a forestry seed cleaning device.

[0028] In the figure: 1. cleaning box; 2. drain pipe; 3. drying chamber; 4. weed cleaning assembly; 401. first telescopic rod; 402. first square frame; 403. first rope winder; 404. first connecting rope; 405. weed screening basket; 406. first guide wheel; 5. seed cleaning assembly; 501. guide rod; 502. second square frame; 503. second rope winder; 504. second connecting rope; 505. seed cleaning screening basket; 506. second guide wheel; 507. slide; 6. moving assembly; 601. cylinder; 602. auxiliary plate; 603. second telescopic rod; 604. connecting plate; 7. dryer; 8. first wave plate; 9. second wave plate; 10. baffle; 11. movable plate; 12. sinking trough. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0030] See also Figure 1-Figure 6 The present invention provides a forestry seed cleaning device, comprising:

[0031] A cleaning box 1, a drain pipe 2 is fixedly sleeved on the lower part of one side of the cleaning box 1, and a drying chamber 3 is fixedly installed on the upper part of one side of the cleaning box 1;

[0032] The weed cleaning component 4 is arranged inside the cleaning box 1. The weed cleaning component 4 includes a first telescopic rod 401. The first telescopic rod 401 is fixedly installed on the upper part of one side of the inner cavity of the cleaning box 1. A first square frame 402 is fixedly installed on one end of the first telescopic rod 401. A first rope winding machine 403 is provided on the top of the first square frame 402. A first connecting rope 404 is provided at the bottom of the first rope winding machine 403. A weed screening basket 405 is fixedly connected to the bottom end of the first connecting rope 404. First guide wheels 406 are provided on both sides of the weed screening basket 405.

[0033] The first wave plate 8 and the second wave plate 9 are fixedly installed at the lower part of both sides of the inner cavity of the cleaning box 1, and the first guide wheels 406 on both sides of the weed screening basket 405 are in contact with the side of the first wave plate 8 and the second wave plate 9 close to each other.

[0034] A weed cleaning component 4 is provided through the inner cavity of the cleaning box 1, and the first connecting rope 404 is wound up by the first rope winding machine 403 on the first square frame 402, so as to drive the weed screening basket 405 to rise. Since the weed screening basket 405 is respectively connected to the first wave plate 8 and the second wave plate 9 by the first guide wheel 406, the shape characteristics of the first wave plate 8 and the second wave plate 9 can be utilized to drive the weed screening basket 405 to move left and right while the weed screening basket 405 rises, so as to facilitate the screening of seeds in the weed screening basket 405 into the seed cleaning screening basket 505, so that the weeds are retained in the weed screening basket 405, so as to facilitate the separation of the weeds and the seeds, and facilitate the subsequent cleaning of the seeds.

[0035] In one embodiment of the present invention, a seed cleaning assembly 5 is provided in the inner cavity of the cleaning box 1, and the seed cleaning assembly 5 includes a guide rod 501, a second square frame 502, a second rope winder 503, a second connecting rope 504, a seed cleaning and screening basket 505 and a second guide wheel 506. The guide rod 501 is fixedly installed on the upper part of the inner cavity of the cleaning box 1, and the front and rear sides of the second square frame 502 are provided with slide grooves 507, and the inner cavity of the slide groove 507 is movably sleeved on the outer side of the guide rod 501. The second rope winder 503 is fixedly installed on the top of the second square frame 502, and the bottom of the second rope winder 503 is connected to the second connecting rope 504, and the bottom end of the second connecting rope 504 is connected to the seed cleaning and screening basket 505, and second guide wheels 506 are provided on both sides of the seed cleaning and screening basket 505. The second guide wheels 506 on both sides of the seed cleaning and screening basket 505 are respectively in contact with the side where the first wave plate 8 and the second wave plate 9 are close to each other. The four corners of the top of the second square frame 502 are each provided with a second rope winding machine 503 , and the second connecting ropes 504 on the four second rope winding machines 503 are respectively connected to the four corners of the top of the seed cleaning and screening basket 505 .

[0036] By providing a seed cleaning component 5 in the cleaning box 1, the second rope winding machine 503 is driven to reel in the second connecting rope 504, which can drive the seed cleaning and screening basket 505 to rise, and the seed cleaning and screening basket 505 is connected to the first wave plate 8 and the second wave plate 9 by the second guide wheel 506. When the seed cleaning and screening basket 505 rises, the shape characteristics of the first wave plate 8 and the second wave plate 9 can be used to drive the seed cleaning and screening basket 505 to move left and right, so as to facilitate the discharge of impurities smaller than the seeds from the bottom of the seed cleaning and screening basket 505, so that only seeds remain in the seed cleaning and screening basket 505.

[0037] In one embodiment of the present invention, a moving assembly 6 is provided at the upper portion of the front side of the cleaning box 1, and the moving assembly 6 includes a cylinder 601, an auxiliary plate 602, a second telescopic rod 603 and a connecting plate 604. The cylinder 601 is fixedly installed at the upper portion of one side of the cleaning box 1, and the output end of the cylinder 601 is connected to the auxiliary plate 602, and the second telescopic rod 603 is fixedly installed at one side of the auxiliary plate 602, and the connecting plate 604 is fixedly installed at one end of the second telescopic rod 603, and the rear side of the connecting plate 604 is fixedly installed on the front side of the second square frame 502, and the top of the drying chamber 3 is fixedly installed with a dryer 7. The cylinder 601 is arranged at the front side of the second square frame 502 and the second rope winding machine 503, and is vertically distributed between the cylinder 601 and the second telescopic rod 603.

[0038] After the second connecting rope 504 is wound up by the second rope winding machine 503 and the seed cleaning and screening basket 505 is driven to move upward, the cylinder 601 is controlled and the auxiliary plate 602, the second telescopic rod 603 and the connecting plate 604 are used to drive the second square frame 502 to move along the outside of the guide rod 501, so as to facilitate moving the seed cleaning and screening basket 505 to the bottom of the dryer 7 and drying it by the dryer 7.

[0039] In one embodiment of the present invention, the front side of the seed cleaning and screening basket 505 is open, and a sinking trough 12 is provided at the front side of the bottom of the seed cleaning and screening basket 505. The inner cavity of the sinking trough 12 is connected to a movable plate 11 by a rotating shaft. The drying chamber 3 is open at the front, left and top, and a baffle 10 is fixedly installed at the front side of one side of the inner cavity of the drying chamber 3.

[0040] A sinking trough 12 and a movable plate 11 are provided on the front side of the seed cleaning and screening basket 505. When the seed cleaning and screening basket 505 is transported to the drying chamber 3 for drying by means of the moving component 6, the seed cleaning and screening basket 505 is moved to a position between one side of the drying chamber 3 and the baffle 10, so that there is no limiting component on the front baffle 10 of the seed cleaning and screening basket 505, thereby facilitating the discharge of the cleaned and dried seeds in the seed cleaning and screening basket 505.

[0041] In one embodiment of the present invention, the bottom of the sinking trough 12 is located below the bottom of the inner cavity of the seed cleaning and screening basket 505, and the front and rear sides of the movable plate 11 are respectively in contact with the inner wall of the cleaning box 1 and the inner wall of the sinking trough 12. By having the bottom of the sinking trough 12 located below the bottom of the inner cavity of the seed cleaning and screening basket 505, and the front and rear sides of the movable plate 11 are respectively in contact with the inner wall of the cleaning box 1 and the inner wall of the sinking trough 12, when the seed cleaning and screening basket 505 is located in the cleaning box 1, the movable plate 11 will not fall over, and the seeds in the seed cleaning and screening basket 505 will not run out of the seed cleaning and screening basket 505.

[0042] In one embodiment of the present invention, the first rope winding machine 403 is provided at each of the four corners of the top of the first square frame 402, and the length and width of the weed screening basket 405 are both smaller than the length and width of the seed cleaning and screening basket 505. Since the length and width of the weed screening basket 405 are both smaller than the length and width of the seed cleaning and screening basket 505, the setting of the weed screening basket 405 does not affect the movement of the seed cleaning and screening basket 505 into the drying chamber 3 for drying.

[0043] In one embodiment of the present invention, the first wave plate 8 and the second wave plate 9 are both wavy in shape, and the concave points on the first wave plate 8 correspond to the convex points on the second wave plate 9. By making the concave points on the first wave plate 8 correspond to the convex points on the second wave plate 9, when the weed screening basket 405 or the first guide wheel 406 moves upward, the weed screening basket 405 or the first guide wheel 406 can be controlled to move left and right, so as to facilitate screening of the materials therein.

[0044] Working principle: When using the device, the seeds to be cleaned are poured into the weed screening basket 405, and the first connecting rope 404 is rolled up by the first rope winding machine 403 on the first square frame 402, so as to drive the weed screening basket 405 to rise. Since the weed screening basket 405 is connected to the first wave plate 8 and the second wave plate 9 respectively by the first guide wheel 406, the shape characteristics of the first wave plate 8 and the second wave plate 9 are utilized, and the weed screening basket 405 can be driven to move left and right while the weed screening basket 405 rises, and the seeds in the weed screening basket 405 are screened into the seed cleaning screening basket 505, so that the weeds are retained in the weed screening basket 405, and the weed screening basket 405 is moved to the upper part of the inner cavity of the cleaning box 1, and the operation of the first rope winding machine 403 is stopped, and the weeds in the weed screening basket 405 are cleaned up;

[0045] At this time, particles smaller than the seeds enter the weed screening basket 405, driving the second rope winding machine 503 to reel the second connecting rope 504, which can drive the seed cleaning and screening basket 505 to rise, and the seed cleaning and screening basket 505 is connected to the first wave plate 8 and the second wave plate 9 by the second guide wheel 506. When the seed cleaning and screening basket 505 rises, the shape characteristics of the first wave plate 8 and the second wave plate 9 can be used to drive the seed cleaning and screening basket 505 to move left and right, and impurities smaller than the seeds are discharged from the bottom of the seed cleaning and screening basket 505. When the seed cleaning and screening basket 505 moves left and right, the seeds in the seed cleaning and screening basket 505 are fully in contact with the cleaning water in the cleaning box 1, and the seeds roll back and forth in the seed cleaning and screening basket 505, so that the seeds can be cleaned more cleanly.

[0046] With the operation of the second rope winding machine 503, the seed cleaning and screening basket 505 is moved to the bottom of the weed screening basket 405, and then the cylinder 601 is controlled to operate, and the auxiliary plate 602, the second telescopic rod 603 and the connecting plate 604 are used to drive the second square frame 502 to move along the outer side of the guide rod 501, and the seed cleaning and screening basket 505 is moved to the bottom of the dryer 7. After ensuring that the front side of the movable plate 11 contacts the rear side of the baffle 10, the operation of the cylinder 601 is stopped, and the operation of the dryer 7 is controlled to dry the seeds.

[0047] After the seeds are dried, the cylinder 601 is started again to move the seed cleaning and screening basket 505 to the middle of the drying chamber 3 and the baffle 10 on the side close to each other. The movable plate 11 is not limited, and the movable plate 11 can be tilted to control the second rope winding machine 503 on the rear side of the second square frame 502 to tilt the seed cleaning and screening basket 505, and pour out the seeds in the seed cleaning and screening basket 505.

[0048] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A forestry seed cleaning device, characterized in that: include: A cleaning box (1), wherein a drain pipe (2) is fixedly sleeved on the lower portion of one side of the cleaning box (1), and a drying chamber (3) is fixedly installed on the upper portion of one side of the cleaning box (1); A weed cleaning component (4) is arranged inside a cleaning box (1), the weed cleaning component (4) comprising a first telescopic rod (401), the first telescopic rod (401) being fixedly mounted on the upper part of one side of the inner cavity of the cleaning box (1), a first square frame (402) being fixedly mounted on one end of the first telescopic rod (401), a first rope winding machine (403) being arranged on the top of the first square frame (402), a first connecting rope (404) being arranged on the bottom of the first rope winding machine (403), a weed screening basket (405) being fixedly connected to the bottom end of the first connecting rope (404), and first guide wheels (406) being arranged on both sides of the weed screening basket (405); A first wave plate (8) and a second wave plate (9) are fixedly mounted at the lower part of both sides of the inner cavity of the cleaning box (1), and first guide wheels (406) on both sides of the weed screening basket (405) are in contact with the first wave plate (8) and the second wave plate (9) on the sides close to each other; A seed cleaning assembly (5) is provided in the inner cavity of the cleaning box (1), and the seed cleaning assembly (5) comprises a guide rod (501), a second square frame (502), a second rope winding machine (503), a second connecting rope (504), a seed cleaning and screening basket (505) and a second guide wheel (506). The guide rod (501) is fixedly mounted on the upper part of the inner cavity of the cleaning box (1), and a slide groove (507) is provided on the front and rear sides of the second square frame (502). The inner cavity of the slide groove (507) is movably sleeved on the guide rod (501). On the outside, a second rope winding machine (503) is fixedly installed on the top of the second square frame (502), a second connecting rope (504) is connected to the bottom of the second rope winding machine (503), a seed cleaning and screening basket (505) is connected to the bottom end of the second connecting rope (504), and second guide wheels (506) are provided on both sides of the seed cleaning and screening basket (505), and the second guide wheels (506) on both sides of the seed cleaning and screening basket (505) are respectively in contact with the first wave plate (8) and the second wave plate (9) on the side close to each other; The four corners of the top of the second square frame (502) are each provided with a second rope winding machine (503), and the second connecting ropes (504) on the four second rope winding machines (503) are respectively connected to the four corners of the top of the seed cleaning and screening basket (505); A moving assembly (6) is provided at the upper portion of the front side of the cleaning box (1), the moving assembly (6) comprising a cylinder (601), an auxiliary plate (602), a second telescopic rod (603) and a connecting plate (604); a cylinder (601) is fixedly mounted on the upper portion of one side of the cleaning box (1); an output end of the cylinder (601) is connected to the auxiliary plate (602); a second telescopic rod (603) is fixedly mounted on one side of the auxiliary plate (602); a connecting plate (604) is fixedly mounted on one end of the second telescopic rod (603); a rear side of the connecting plate (604) is fixedly mounted on the front side of the second square frame (502); and a dryer (7) is fixedly mounted on the top of the drying chamber (3).

2. A forestry seed cleaning device according to claim 1, characterized in that: The cylinder (601) is arranged at the front side of the second square frame (502) and the second rope winding machine (503), and is vertically distributed between the cylinder (601) and the second telescopic rod (603).

3. A forestry seed cleaning device according to claim 1, characterized in that: The front side of the seed cleaning and screening basket (505) is open, and a sinking groove (12) is provided on the front side of the bottom of the seed cleaning and screening basket (505). The inner cavity of the sinking groove (12) is connected to a movable plate (11) via a rotating shaft.

4. A forestry seed cleaning device according to claim 3, characterized in that: The bottom of the sinking trough (12) is located below the bottom of the inner cavity of the seed cleaning and screening basket (505), and the front and rear sides of the movable plate (11) are respectively in contact with the inner wall of the cleaning box (1) and the inner wall of the sinking trough (12).

5. The forestry seed cleaning device according to claim 1, characterized in that: The drying chamber (3) is generally open at the front, left and top, and a baffle (10) is fixedly mounted at the front side of one side of the inner cavity of the drying chamber (3).

6. The forestry seed cleaning device according to claim 1, characterized in that: The first rope winding machines (403) are provided at the four corners of the top of the first square frame (402), and the length and width of the weed screening basket (405) are both smaller than the length and width of the seed cleaning and screening basket (505).

7. The forestry seed cleaning device according to claim 1, characterized in that: The first wave plate (8) and the second wave plate (9) are both wavy in shape as a whole, and the concave points on the first wave plate (8) correspond to the convex points on the second wave plate (9).

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