Water and fertilizer integrated agricultural planting intelligent drip irrigation device

Abstract

The application discloses a water and fertilizer integrated agricultural planting intelligent drip irrigation device and belongs to the technical field of agricultural drip irrigation. The water and fertilizer integrated agricultural planting intelligent drip irrigation device comprises a drip irrigation water tank, the side of the drip irrigation water tank is connected with a drip irrigation water pipe through a pump, the surface of the drip irrigation water tank is bolt-connected with a motor, the output end of the motor is fixedly connected with an elongated pin, the elongated pin is rotationally arranged in the drip irrigation water tank, and the inside of the drip irrigation water tank is rotationally arranged with a connecting shaft. In the working process, the drip irrigation water tank is supplied with water through water inlet accessories, drip irrigation is completed through the pump and the drip irrigation water pipe, the elongated pin and the connecting shaft rotate when the motor starts, the stirring blades realize stirring work at this time, the sliding plate moves in the horizontal direction under the action of the reciprocating assembly, the sliding plate and the through hole play the role of auxiliary stirring, the stirring effect is improved, the brush on the surface of the inner rod plays the role of auxiliary cleaning, and the fertilizer is not left and can be efficiently mixed.

Description

Technical Field

[0001] This invention relates to the field of agricultural drip irrigation technology, specifically to an intelligent drip irrigation device for integrated water and fertilizer management in agricultural planting. Background Technology

[0002] Agricultural drip irrigation can precisely deliver water and fertilizer to the roots of crops, significantly reducing water waste and fertilizer runoff. It saves water and fertilizer, as well as labor and effort. Furthermore, integrated water and fertilizer drip irrigation can reduce field humidity and mitigate diseases, ultimately improving crop yield and quality. It is adaptable to various terrains and planting patterns. In the process of agricultural drip irrigation, intelligent drip irrigation devices are required. These devices are the carriers of alternating drip irrigation technology and a key technological support for green agriculture. During drip irrigation, the mixing of water and fertilizer is crucial. Poor mixing not only affects the drip head but also reduces yield. To overcome this deficiency, existing technology 1 (Chinese Utility Model Patent Application No. 202320694141.2, application date 2023-03-30) discloses a pesticide application drip irrigation device. It has an internal stirring structure. Through the cooperation of the various components of the stirring structure, the pesticide added to the water storage tank can be stirred, ensuring uniform mixing of the pesticide solution and ensuring the effectiveness of the pesticide solution for seedlings. Prior art 2 (Chinese Utility Model Patent Application No. 202322402888.9, filed on 2023-09-05) describes a sprinkler drip irrigation device. When in operation, it uses a servo motor, transmission rod, and mixing component. When it is necessary to mix auxiliary materials and water, the servo motor is activated, driving the transmission rod and mixing component to rotate, thereby uniformly mixing the auxiliary materials and water. Prior art 3 (Chinese Utility Model Patent Application No. 202023107442.6, filed on 2020-12-21) describes a drip irrigation device for grapefruit seedling cultivation. It is equipped with a rotating shaft and a mounting rod. An external power supply starts the motor, which then drives the mounting rod to rotate, thus mixing the liquid inside the drip irrigation device. This improves the mixing effect and prevents incomplete mixing from accumulating on the inner wall of the device, causing blockages. It is also convenient to use. When the machine is working, the feed is fed through the feeding device. A filter screen is installed at the feed pipe. However, after the drip irrigation device has been working for a long time, the filter screen can only intercept large particles. In addition, the fertilizer is not fully dissolved, impurities settle, and the water quality is poor. Scale is easily generated at the discharge position of the feed pipe, which can lead to blockage. If a reasonable cleaning structure is not set up, it will not only increase the subsequent cleaning work of the staff, but also affect the subsequent use of the drip irrigation box and reduce work efficiency. Summary of the Invention

[0003] The purpose of this invention is to provide an intelligent drip irrigation device for integrated water and fertilizer agriculture, in order to solve the problem mentioned in the background art that the lack of a reasonable cleaning structure not only increases the subsequent cleaning work of the staff, but also affects the subsequent use of the drip irrigation box and reduces work efficiency.

[0004] To achieve the above objectives, the present invention provides the following technical solution: an intelligent drip irrigation device for integrated water and fertilizer agricultural planting, comprising a drip irrigation tank, a drip irrigation pipe connected to the side of the drip irrigation tank via a pump, a motor bolted to the surface of the drip irrigation tank, and a long pin fixedly connected to the output end of the motor, the long pin being rotatably disposed inside the drip irrigation tank; in addition, a connecting shaft is rotatably disposed inside the drip irrigation tank, and stirring blades are provided on the surface of the connecting shaft and the long pin, and a water inlet accessory is also provided on the surface of the drip irrigation tank; a sliding plate is connected to the inside of the drip irrigation tank via a reciprocating assembly, and a fixing block is fixedly connected to the surface of the sliding plate; a float is movably disposed inside the drip irrigation tank, and an inner rod is connected to the float via a reversing assembly, the surface of the inner rod being provided with a brush; a moving block is disposed inside the water inlet accessory via a swinging assembly, and a striking rod is fixedly connected to the lower surface of the moving block, and a top plate is movably disposed inside the water inlet accessory.

[0005] Preferably, the long pin is connected to the connecting shaft via a pulley, and the reciprocating assembly includes a circular plate fixedly connected to the surface of the connecting shaft, with a guide block fixedly connected to the surface of the circular plate.

[0006] Preferably, a limiting rod is fixedly connected to the inner wall of the drip irrigation tank, and the sliding plate is slidably provided on the surface of the limiting rod. The surface of the fixing block and the surface of the guiding block are both sleeved and connected with connecting rods, and the surface of the sliding plate is also provided with through holes at equal intervals.

[0007] Preferably, the reversing assembly includes a column fixedly connected to the inner wall of the drip irrigation tank, and a float plate is sleeved and connected to the surface of the column. An upper connecting plate is fixedly connected to the upper surface of the float plate. In addition, an inner rod is slidably arranged inside the upper connecting plate, and the end of the column is protruding.

[0008] Preferably, an auxiliary plate is fixedly connected to the end of the inner rod, and magnets are provided on the surface of the auxiliary plate and the inner wall of the upper connecting plate. In addition, the magnets on the surface of the auxiliary plate are distributed at equal angles.

[0009] Preferably, a push-pull rod is fixedly connected to the side of the skateboard, and the top view of the push-pull rod is "U" shaped, and a force-bearing plate is fixedly connected to the end of the inner rod.

[0010] Preferably, the inner rod has a groove on its surface, and the upper plate has a protruding rod fixedly connected to its surface. The front of the protruding rod is an inverted "L" structure, and the groove is spiral-shaped.

[0011] Preferably, the water inlet fitting has a bent structure, and a filter screen is provided on the inner wall of the water inlet fitting. The swing assembly includes a crossbar fixedly connected to the inner wall of the water inlet fitting, and a working plate is sleeved on the surface of the crossbar.

[0012] Preferably, a pressing rod is fixedly connected to the lower surface of the working plate, an inner connecting plate is fixedly connected to the inner wall of the water inlet fitting, a guide plate is fixedly connected to the surface of the inner connecting plate, and a moving block is slidably arranged on the surface of the guide plate.

[0013] Preferably, a transition rod is movably connected to both the side of the top plate and the interior of the guide plate, a connecting spring is fixedly connected to the inner wall of the guide plate, and the other side of the connecting spring is fixedly connected to the surface of the moving block.

[0014] Compared with the prior art, the beneficial effects of this invention are as follows: Adopting a novel structural design, during operation, the water inlet fittings supply material to the drip irrigation tank, and the pump and drip irrigation pipes complete the drip irrigation process. When the motor starts, the long pin and connecting shaft rotate, at which point the stirring blades perform the stirring work. Simultaneously, the sliding plate moves horizontally under the action of the reciprocating assembly, thus the sliding plate and through-hole play an auxiliary stirring role, improving the stirring effect. Furthermore, the brush on the inner rod surface plays an auxiliary cleaning role, preventing fertilizer residue and ensuring efficient mixing. The specific details are as follows: (1) When the motor is working, the motor drives the long pin to rotate directly. The long pin drives the connecting shaft to rotate through the pulley. At this time, the connecting shaft drives the round plate and the guide block to work. Then, the sliding plate moves horizontally under the action of the limit rod, the connecting rod and the fixing block. At this time, the sliding plate and the through hole on its surface play the role of side auxiliary stirring. The sliding plate and the stirring blade cooperate to optimize the stirring effect and make the water and fertilizer deeply mixed. At the same time, a cover plate can be set on the drip irrigation tank to block dust and make the drip irrigation tank work normally.

[0015] (2) The intelligent drip irrigation device for integrated water and fertilizer agricultural planting has an induction control inside the drip irrigation tank. Initially, the float plate and the upper connecting plate are located at the upper end of the drip irrigation tank. After the water and fertilizer are consumed, the float plate and the upper connecting plate descend synchronously (the induction controller controls the sliding plate to be in the initial state, which facilitates the connection between the force plate and the push-pull rod), so that the force plate enters the push-pull rod. Then, when the motor works again, the force plate, the inner rod and the brush parts move back and forth in a straight line in the horizontal direction. At this time, the brush parts can clean the inner wall of the water inlet accessories, so that the fertilizer residue on the inner wall of the water inlet accessories enters the drip irrigation tank and is easily mixed.

[0016] Furthermore, when the inner rod moves, it rotates inside the upper plate under the action of the groove and the protrusion, thereby optimizing the cleaning effect of the brush and improving work efficiency.

[0017] (3) In the process of the inner rod moving, the intelligent drip irrigation device for integrated water and fertilizer agricultural planting will push the working plate. At this time, the working plate will push the top plate through the squeezing rod. The top plate will push the moving block through the transition rod, so that the moving block slides on the surface of the guide plate. Then the moving block will hit the filter screen on the inner wall of the water inlet fitting through the striking rod, so that large particles fall down and will not enter the interior of the water inlet fitting, which is convenient for the later inspection and maintenance work of the staff. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the connection structure between the drip irrigation tank and the drip irrigation pipe of the present invention; Figure 2 This is a schematic diagram of the connection structure between the drip irrigation tank and the motor of the present invention; Figure 3 This is a cross-sectional structural diagram of the drip irrigation tank of the present invention; Figure 4 This is a schematic diagram of the connection structure between the connecting shaft and the circular plate of the present invention; Figure 5 This is a schematic diagram of the connection structure between the slide plate and the push-pull rod of the present invention; Figure 6 This is a schematic diagram of the connection structure between the inner rod and the force-bearing plate of the present invention; Figure 7 For the present invention Figure 6 Enlarged structural diagram at point A in the middle; Figure 8 This is a schematic diagram of the magnet distribution structure of the present invention; Figure 9 This is a schematic diagram of the linkage working state structure of the present invention; Figure 10 This is a schematic diagram of the groove distribution structure of the present invention; Figure 11 This is a schematic diagram of the distribution structure of the striking rod in this invention.

[0019] In the diagram: 1. Drip irrigation tank; 2. Drip irrigation pipe; 3. Motor; 4. Long pin; 5. Connecting shaft; 6. Limiting rod; 7. Column; 8. Float; 9. Inlet fitting; 10. Circular plate; 11. Guide block; 12. Fixing block; 13. Connecting rod; 14. Slide plate; 15. Upper connecting plate; 16. Force plate; 17. Inner rod; 18. Push-pull rod; 19. Auxiliary plate; 20. Magnet; 21. Groove; 22. Protruding rod; 23. Crossbar; 24. Inner connecting plate; 25. Working plate; 26. Extrusion rod; 27. Guide plate; 28. Connecting spring; 29. ​​Moving block; 30. Striking rod; 31. Top plate; 32. Transition rod. Detailed Implementation

[0020] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0021] Please see Figures 1-11 The present invention provides the following technical solution: an intelligent drip irrigation device for integrated water and fertilizer agricultural planting.

[0022] Example 1: By using the reciprocating component, the slide plate 14 can move horizontally, thus assisting in stirring. Figures 1-5 As shown, the system includes a drip irrigation tank 1, a drip irrigation pipe 2 connected to the side of the drip irrigation tank 1 via a pump, a motor 3 bolted to the surface of the drip irrigation tank 1, and a long pin 4 fixedly connected to the output end of the motor 3. The long pin 4 is rotatably disposed inside the drip irrigation tank 1. In addition, a connecting shaft 5 is rotatably disposed inside the drip irrigation tank 1, and stirring blades are provided on the surface of the connecting shaft 5 and the long pin 4. A water inlet accessory 9 is also provided on the surface of the drip irrigation tank 1. A slide plate 14 is connected to the inside of the drip irrigation tank 1 via a reciprocating assembly, and a fixing block 12 is fixedly connected to the surface of the slide plate 14. The long pin 4 and the connecting shaft 5 are connected via a pulley. The reciprocating assembly includes a circular plate 10 fixedly connected to the surface of the connecting shaft 5, and a guide block 11 is fixedly connected to the surface of the circular plate 10.

[0023] A limiting rod 6 is fixedly connected to the inner wall of the drip irrigation tank 1, and a sliding plate 14 is slidably provided on the surface of the limiting rod 6. A connecting rod 13 is sleeved and connected to the surface of the fixing block 12 and the surface of the guide block 11. Through holes are also opened at equal intervals on the surface of the sliding plate 14.

[0024] The drip irrigation tank 1 achieves drip irrigation through the pump and drip irrigation pipe 2. At the same time, the drip irrigation tank 1 is replenished with liquid fertilizer through the water inlet accessory 9 (liquid fertilizer is added on one side at a time). When the drip irrigation tank 1 is working, the motor 3 is started intermittently. When the motor 3 is working, the long pin 4 rotates. The long pin 4 drives the connecting shaft 5 to rotate through the pulley. At this time, the stirring blade works to achieve the mixing of water and fertilizer. When the connecting shaft 5 rotates, the connecting shaft 5 drives the circular plate 10 and the guide block 11 to rotate synchronously. At this time, the slide plate 14 makes reciprocating linear motion in the horizontal direction under the action of the connecting rod 13, the fixed block 12 and the limit rod 6. At this time, the slide plate 14 itself can stir the liquid. The through holes evenly distributed on the surface of the slide plate 14 also play an auxiliary stirring role, optimizing the water and fertilizer mixing effect.

[0025] Example 2: Unlike Example 1, the reversing assembly allows the inner rod 17 and the brush to reciprocate linearly, cleaning the inner wall of the water inlet accessory 9. Figures 6-10 As shown, the float plate 8 is movably disposed inside the drip irrigation tank 1. The float plate 8 is connected to the inner rod 17 via a reversing assembly, and the surface of the inner rod 17 is provided with brush parts. The reversing assembly includes a column 7 fixedly connected to the inner wall of the drip irrigation tank 1, and the surface of the column 7 is sleeved with the float plate 8. The upper surface of the float plate 8 is fixedly connected to the upper connecting plate 15. In addition, the inner rod 17 is slidably disposed inside the upper connecting plate 15, and the end of the column 7 is protruding.

[0026] An auxiliary plate 19 is fixedly connected to the end of the inner rod 17, and magnets 20 are provided on the surface of the auxiliary plate 19 and the inner wall of the upper connecting plate 15. In addition, the magnets 20 on the surface of the auxiliary plate 19 are distributed at equal angles. A push-pull rod 18 is fixedly connected to the side of the slide plate 14, and the top view of the push-pull rod 18 is "U" shaped. A force-bearing plate 16 is fixedly connected to the end of the inner rod 17. A groove 21 is opened on the surface of the inner rod 17. A protruding rod 22 is fixedly connected to the surface of the upper connecting plate 15, and the front view of the protruding rod 22 is an inverted "L" structure. In addition, the groove 21 is spiral.

[0027] The drip irrigation tank 1 is equipped with an induction controller. Initially, the float plate 8 and the upper connecting plate 15 are located at the top of the drip irrigation tank 1. After the water and fertilizer are consumed, the float plate 8 and the upper connecting plate 15 descend synchronously (when the float plate 8 and the upper connecting plate 15 descend to two centimeters above the water inlet accessory 9, the induction controller controls the motor 3 and the sliding plate 14 to keep the sliding plate 14 in its initial state, which facilitates the connection between the force plate 16 and the push-pull rod 18). When the float plate 8 descends, the column 7 makes the float plate 8 move only in the vertical direction. Finally, the force plate 16 enters the interior of the push-pull rod 18. After that, when the motor 3 works again, the force plate 16, the inner rod 17, and the brush component move in a reciprocating linear motion synchronously in the horizontal direction. At this time, the brush component can clean the inner wall of the water inlet accessory 9, so that the fertilizer residue on the inner wall of the water inlet accessory 9 enters the drip irrigation tank 1 and is easily mixed.

[0028] When the inner rod 17 moves, it rotates inside the upper connecting plate 15 under the action of the groove 21 and the protrusion 22, thereby optimizing the cleaning effect of the brush and improving work efficiency. In addition, the magnets 20 on the inner wall of the upper connecting plate 15 and the magnets 20 on the inner wall of the auxiliary plate 19 keep the inner rod 17 stable through mutual magnetic attraction. Thus, the position of the force plate 16 will not change before the force plate 16 enters the push-pull rod 18, so that the force plate 16 and the push-pull rod 18 are properly connected (only when maintenance is required will the float plate 8 and the force plate 16 descend to the state of connecting with the push-pull rod 18; in other working states, the drip irrigation tank 1 is full of materials).

[0029] Example 3: Unlike Example 2, the swing assembly allows the moving block 29 and the striking rod 30 to intermittently strike the filter screen, causing impurities to fall off and facilitating filter screen cleaning. Figure 10 and Figure 11 As shown, the movable block 29 is set inside the water inlet fitting 9 by a swing assembly, and a striking rod 30 is fixedly connected to the lower surface of the movable block 29. In addition, a top plate 31 is movably arranged inside the water inlet fitting 9. The water inlet fitting 9 has a bent structure, and a filter screen is provided on the inner wall of the water inlet fitting 9. The swing assembly includes a crossbar 23 fixedly connected to the inner wall of the water inlet fitting 9, and a working plate 25 is sleeved and connected to the surface of the crossbar 23.

[0030] A pressing rod 26 is fixedly connected to the lower surface of the working plate 25. An inner connecting plate 24 is fixedly connected to the inner wall of the water inlet fitting 9, and a guide plate 27 is fixedly connected to the surface of the inner connecting plate 24. A moving block 29 is slidably arranged on the surface of the guide plate 27. A transition rod 32 is movably connected to the side of the top plate 31 and the inside of the guide plate 27. A connecting spring 28 is fixedly connected to the inner wall of the guide plate 27, and the other side of the connecting spring 28 is fixedly connected to the surface of the moving block 29.

[0031] When the inner rod 17 reciprocates linearly in the horizontal direction, it intermittently pushes the working plate 25, causing it to slide on the surface of the crossbar 23. At this time, the working plate 25 pushes the top plate 31 through the pressing rod 26. When the top plate 31 is pushed, it pushes the moving block 29 through the transition rod 32, causing it to slide on the surface of the guide plate 27. At this time, the connecting spring 28 is compressed. When the top plate 31 is not pushed, the moving block 29 returns to its original position under the action of the connecting spring 28. The above process is repeated, and the moving block 29 and the striking rod 30 reciprocate linearly in the vertical direction. At this time, the striking rod 30 intermittently strikes the filter screen, causing large particles of impurities to fall down, which facilitates the cleaning and maintenance of the water inlet fittings 9 by the staff (a rubber protective sleeve can be installed on the connecting spring 28 to cover it).

[0032] The above is the entire working process of the device, and all contents not described in detail in this specification are existing technologies known to those skilled in the art.

[0033] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A smart drip irrigation device for integrated water and fertilizer agricultural planting, comprising a drip irrigation tank (1), wherein a drip irrigation pipe (2) is connected to the side of the drip irrigation tank (1) via a pump, and a motor (3) is bolted to the surface of the drip irrigation tank (1), and a long pin (4) is fixedly connected to the output end of the motor (3), while the long pin (4) is rotatably disposed inside the drip irrigation tank (1); In addition, the internal rotating part of the drip irrigation tank (1) is provided with a connecting shaft (5), and the surface of the connecting shaft (5) and the long pin (4) are both provided with stirring blades. Furthermore, the surface of the drip irrigation tank (1) is also provided with a water inlet fitting (9). Its features are: A sliding plate (14) is connected to the inside of the drip irrigation tank (1) via a reciprocating assembly, and a fixing block (12) is fixedly connected to the surface of the sliding plate (14); a float (8) is movably disposed inside the drip irrigation tank (1), and the float (8) is connected to an inner rod (17) via a reversing assembly, and a brush is provided on the surface of the inner rod (17); The movable block (29) is set inside the water inlet fitting (9) by a swing assembly, and a striking rod (30) is fixedly connected to the lower surface of the movable block (29). In addition, a top plate (31) is movably set inside the water inlet fitting (9).

2. The intelligent drip irrigation device for integrated water and fertilizer management in agriculture according to claim 1, characterized in that: The long pin (4) is connected to the connecting shaft (5) via a pulley. The reciprocating assembly includes a circular plate (10) fixedly connected to the surface of the connecting shaft (5), and a guide block (11) is fixedly connected to the surface of the circular plate (10).

3. The intelligent drip irrigation device for integrated water and fertilizer management in agriculture according to claim 2, characterized in that: A limiting rod (6) is fixedly connected to the inner wall of the drip irrigation tank (1), and a sliding plate (14) is slidably provided on the surface of the limiting rod (6). A connecting rod (13) is sleeved on the surface of the fixing block (12) and the surface of the guide block (11). Through holes are also opened at equal intervals on the surface of the sliding plate (14).

4. The intelligent drip irrigation device for integrated water and fertilizer management in agriculture according to claim 1, characterized in that: The reversing assembly includes a column (7) fixedly connected to the inner wall of the drip irrigation tank (1), and a float plate (8) is sleeved and connected to the surface of the column (7), and an upper connecting plate (15) is fixedly connected to the upper surface of the float plate (8). In addition, an inner rod (17) is slidably arranged inside the upper connecting plate (15), and the end of the column (7) is protruding.

5. The intelligent drip irrigation device for integrated water and fertilizer management in agriculture according to claim 4, characterized in that: An auxiliary plate (19) is fixedly connected to the end of the inner rod (17), and magnets (20) are provided on the surface of the auxiliary plate (19) and the inner wall of the upper connecting plate (15). In addition, the magnets (20) on the surface of the auxiliary plate (19) are distributed at equal angles.

6. The intelligent drip irrigation device for integrated water and fertilizer management in agriculture according to claim 1, characterized in that: The side of the slide (14) is fixedly connected to a push-pull rod (18), and the top view of the push-pull rod (18) is "U" shaped. The end of the inner rod (17) is fixedly connected to a force plate (16).

7. The intelligent drip irrigation device for integrated water and fertilizer management in agriculture according to claim 4, characterized in that: The inner rod (17) has a groove (21) on its surface, and the upper plate (15) has a protruding rod (22) fixedly connected to its surface. The front of the protruding rod (22) is an inverted "L" structure. In addition, the groove (21) is spiral.

8. The intelligent drip irrigation device for integrated water and fertilizer management in agriculture according to claim 1, characterized in that: The water inlet fitting (9) has a bent structure and a filter screen is provided on the inner wall of the water inlet fitting (9). The swing assembly includes a crossbar (23) fixedly connected to the inner wall of the water inlet fitting (9), and a working plate (25) is sleeved on the surface of the crossbar (23).

9. The intelligent drip irrigation device for integrated water and fertilizer management in agriculture according to claim 8, characterized in that: The lower surface of the working plate (25) is fixedly connected to an extrusion rod (26), the inner wall of the water inlet fitting (9) is fixedly connected to an inner connecting plate (24), and the surface of the inner connecting plate (24) is fixedly connected to a guide plate (27), and the surface of the guide plate (27) is slidably provided with a moving block (29).

10. The intelligent drip irrigation device for integrated water and fertilizer management in agriculture according to claim 9, characterized in that: A transition rod (32) is movably connected to the side of the top plate (31) and the inside of the guide plate (27). A connecting spring (28) is fixedly connected to the inner wall of the guide plate (27), and the other side of the connecting spring (28) is fixedly connected to the surface of the moving block (29).

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