Water and fertilizer integrated automatic fertilizer adding device

Abstract

The invention discloses a water and fertilizer integrated automatic fertilizer adding device, and relates to the field of fertilizer adding, the water and fertilizer integrated automatic fertilizer adding device comprises a placing plate, the bottom of the placing plate is fixedly connected with supporting columns, the bottoms of the supporting columns are fixedly connected with moving wheels, the top of the placing plate is fixedly connected with a mixing unit, and the outer surface of the mixing unit is fixedly connected with a storage unit. The bottom of the placing plate is fixedly connected with a detection unit, a solid fertilizer is stored in the storage unit, a certain amount of water is put into the mixing unit, then the detection unit can detect the humidity of soil, so that the storage unit can add a specific solid fertilizer, and finally the mixing unit can stir the solid fertilizer and spray the solid fertilizer into the soil.

Description

Technical Field

[0001] The invention relates to the technical field of fertilizer addition, in particular to an automatic fertilizer addition device integrating water and fertilizer. Background Art

[0002] The integrated water and fertilizer automatic fertilization device is an advanced agricultural equipment that cleverly integrates irrigation and fertilization functions. The device uses sensors to monitor key parameters such as soil moisture and nutrients in real time. After the information is transmitted to the controller, it analyzes and makes decisions. The fertilizer is stored in a special tank. When working, the power equipment uses the metering device to add the fertilizer to the irrigation water according to the precise proportion set by the controller, and then transports it through a pipe connected to the irrigation system. This process can effectively avoid the drawbacks of traditional fertilization and irrigation methods, realize precise irrigation and fertilization, and can accurately supply water and fertilizer according to crop needs, improve fertilizer utilization and save labor. It can also be widely used in greenhouses, orchards, fields and other planting scenarios to ensure high-quality conditions for crop growth;

[0003] During the fertilization process, a humidity sensor is needed to detect soil humidity. The soil humidity sensor may be corroded or covered by impurities due to long-term contact with water, minerals, etc. in the soil, making the measured soil humidity data inaccurate. Summary of the invention

[0004] In view of the deficiencies of the prior art, the technical solution adopted by the present invention to solve the technical problems is as follows: the water-fertilizer integrated automatic fertilizer adding device of the present invention comprises a placing plate, the bottom of the placing plate is fixedly connected to a supporting column, the bottom of the supporting column is fixedly connected to a moving wheel, the top of the placing plate is fixedly connected to a mixing unit, the outer surface of the mixing unit is fixedly connected to a storage unit, and the bottom of the placing plate is fixedly connected to a detection unit;

[0005] The detection unit comprises a bottom block, the bottom of the bottom block is fixedly connected to a stabilizing plate, the outer surface of the stabilizing plate is fixedly connected to a servo motor 1, the output end of the servo motor 1 is fixedly connected to a rotating shaft 1, and the bottom of the rotating shaft 1 is fixedly connected to a transverse movement mechanism;

[0006] The transverse movement mechanism includes a support plate 1, the outer surface of the support plate 1 is fixedly connected to a servo motor 2, the output end of the servo motor 2 is fixedly connected to a screw rod, the outer surface of the screw rod is threadedly connected to a detection mechanism, the bottom of the support plate 1 is fixedly connected to a support rod 1, and the bottom of the support rod 1 is fixedly connected to a brush plate.

[0007] Preferably, the top of the bottom block is fixedly connected to the bottom of the placement plate, and the top of the support plate one is fixedly connected to the bottom of the rotating shaft one.

[0008] Preferably, the detection mechanism includes a moving block, the outer surface of the moving block is fixedly connected to a support rod 2, the bottom of the support rod 2 is fixedly connected to a humidity detection device, the bottom of the moving block is fixedly connected to a telescopic sleeve, the bottom of the telescopic sleeve is slidably connected to a telescopic rod 2, the bottom of the telescopic rod 2 is fixedly connected to a detection head, the bottom of the humidity detection device is fixedly connected to an electric wire, and the outer surface of the telescopic sleeve is fixedly connected to an auxiliary mechanism.

[0009] Preferably, the inner wall of the moving block is threadedly connected to the outer surface of the screw rod, and the bottom of the electric wire is fixedly connected to the outer surface of the detection head.

[0010] Preferably, the auxiliary mechanism includes a support plate two, an outer surface of the support plate two is fixedly connected to a telescopic rod three, an outer surface of the telescopic rod three is fixedly connected to a support plate three, a partition is fixedly connected to the top of the support plate three, an end of the support plate three away from the telescopic rod three is fixedly connected to a placement rack, a sweeping rod is placed on the top of the placement rack, and a rotating block is fixedly connected to the bottom of the sweeping rod.

[0011] Preferably, the side of the rotating block away from the sweeping rod is rotatably connected to the outer surface of the second telescopic rod, and the outer surface of the second support plate is fixedly connected to the outer surface of the telescopic sleeve.

[0012] Preferably, the mixing unit includes a mixing bin, the bottom of the mixing bin is rotatably connected to a rotating shaft 2, the bottom of the rotating shaft 2 is fixedly connected to a servo motor 3, the outer surface of the rotating shaft 2 is fixedly connected to a stirring rod, the top of the rotating shaft 2 is fixedly connected to a liquid pump, the top of the liquid pump is fixedly connected to a liquid spreading plate, the outer surface of the liquid pump is fixedly connected to a water pipe, and the bottom of the water pipe is fixedly connected to an isolation plate.

[0013] Preferably, the bottom of the mixing bin is fixedly connected to the top of the placement plate, and the outer surface of the servo motor three is fixedly connected to the inner wall of the placement plate.

[0014] Preferably, the storage unit includes a support plate four, the top of the support plate four is fixedly connected to a storage box, the top of the storage box is rotatably connected to a flip cover, the outer surface of the storage box is fixedly connected to a servo motor four, the output end of the servo motor four is fixedly connected to a rotating shaft three, the outer surface of the rotating shaft three is evenly provided with toggle plates, and the number of the toggle plates is four.

[0015] Preferably, the bottom of the support plate 4 is fixedly connected to the outer surface of the mixing box.

[0016] The beneficial effects of the present invention are as follows:

[0017] 1. The present invention sets a transverse movement mechanism. Servo motor 1 drives shaft 1 to rotate, thereby controlling the transverse movement mechanism at the bottom to rotate. At the same time, servo motor 2 drives the screw rod to rotate and then drives the detection mechanism to move horizontally, so that the detection mechanism can detect the soil in a larger area at the bottom of the placement plate, and can comprehensively detect the humidity of the soil, thereby facilitating the subsequent configuration of the ratio of fertilizer and water.

[0018] 2. The present invention sets up a detection mechanism. When the servo motor 2 drives the screw to rotate and then drives the moving block to move horizontally, the brush plate will rub against the detection head, thereby removing moisture, minerals, etc. on the detection head, avoiding the detection head being covered by impurities or even corroded, making the measured soil moisture data inaccurate.

[0019] 3. The present invention sets an auxiliary mechanism, and the telescopic rod three pushes the supporting plate two to move outward, so that the sweeping rod on the placement frame is disengaged and the rotating block is rotated, so that the sweeping rod sweeps the surface of the soil before the detection head enters the soil, sweeping away the stones on the soil surface, thereby avoiding the detection head being unable to extend into the soil.

[0020] 4. The present invention provides a mixing unit and a storage unit. The liquid pump will suck the liquid fertilizer into the liquid spreading plate through the water pipe. The centrifugal force generated by the rotation will cause the liquid fertilizer to flow out of the liquid spreading plate and sprinkle onto the soil. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a structural schematic diagram of the present invention.

[0022] Figure 2 It is a bottom view of the structure of the present invention.

[0023] Figure 3 It is a structural schematic diagram of the detection unit of the present invention.

[0024] Figure 4 It is a structural schematic diagram of the transverse movement mechanism of the present invention.

[0025] Figure 5 It is a structural schematic diagram of the detection mechanism of the present invention.

[0026] Figure 6 yes Figure 5 Enlarged view of point A in the middle.

[0027] Figure 7 It is a schematic structural diagram of the mixing unit of the present invention.

[0028] Figure 8 It is a structural schematic diagram of the storage unit of the present invention.

[0029] In the figure: 1, placement plate; 2, support column; 3, moving wheel; 4, mixing unit; 5, storage unit; 6, detection unit; 61, bottom block; 62, stabilizing plate; 63, servo motor 1; 64, rotating shaft 1; 65, transverse movement mechanism; 651, support plate 1; 652, servo motor 2; 653, screw rod; 654, detection mechanism; 655, support rod 1; 656, brush plate; 6541, moving block; 6542, support rod 2; 6543, humidity detection device; 6544, telescopic sleeve; 6545, telescopic rod 2; 6546, detection head; 6547. Auxiliary mechanism; 6548. Electric wire; 65471. Support plate two; 65472. Telescopic rod three; 65473. Support plate three; 65474. Partition plate; 65475. Placement rack; 65476. Sweeping rod; 65477. Rotating block; 41. Mixing bin; 42. Servo motor three; 43. Rotating shaft two; 44. Liquid pump; 45. Sprinkling plate; 46. Water pipe; 47. Isolation plate; 48. Stirring rod; 51. Support plate four; 52. Storage box; 53. Servo motor four; 54. Flip cover; 55. Rotating shaft three; 56. Toggle plate. DETAILED DESCRIPTION

[0030] The present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. The embodiments of the present invention are provided for the purpose of illustration and description, and are not intended to be exhaustive or to limit the present invention to the disclosed forms. Many modifications and variations will be apparent to those of ordinary skill in the art. The embodiments are selected and described in order to better illustrate the principles and practical applications of the present invention, and to enable those of ordinary skill in the art to understand the present invention and thereby design various embodiments with various modifications suitable for specific uses.

[0031] Example 1, using Figure 1-Figure 8 An automatic fertilizer adding device integrating water and fertilizer according to one embodiment of the present invention is described as follows.

[0032] like Figure 1-Figure 2 As shown, an integrated water-fertilizer automatic fertilizer adding device of the present invention comprises a placing plate 1, a supporting column 2 is fixedly connected to the bottom of the placing plate 1, a moving wheel 3 is fixedly connected to the bottom of the supporting column 2, a mixing unit 4 is fixedly connected to the top of the placing plate 1, a storage unit 5 is fixedly connected to the outer surface of the mixing unit 4, and a detection unit 6 is fixedly connected to the bottom of the placing plate 1;

[0033] When the present invention is working, solid fertilizer is first stored in the storage unit 5, and a certain amount of water is placed in the mixing unit 4. Then the detection unit 6 detects the moisture of the soil, so that the storage unit 5 can add specific solid fertilizer. Finally, the mixing unit 4 stirs the solid fertilizer and sprays it into the soil.

[0034] like Figure 3As shown, the detection unit 6 includes a bottom block 61, a stabilizing plate 62 is fixedly connected to the bottom of the bottom block 61, a servo motor 63 is fixedly connected to the outer surface of the stabilizing plate 62, an output end of the servo motor 63 is fixedly connected to a rotating shaft 64, and a transverse movement mechanism 65 is fixedly connected to the bottom of the rotating shaft 64;

[0035] like Figure 4 As shown, the transverse movement mechanism 65 includes a support plate 651, the outer surface of the support plate 651 is fixedly connected to a servo motor 652, the output end of the servo motor 652 is fixedly connected to a screw rod 653, the outer surface of the screw rod 653 is threadedly connected to a detection mechanism 654, the bottom of the support plate 651 is fixedly connected to a support rod 655, and the bottom of the support rod 655 is fixedly connected to a brush plate 656.

[0036] Servo motor 1 63 will drive shaft 1 64 to rotate, thereby controlling the bottom transverse movement mechanism 65 to rotate. At the same time, servo motor 2 652 will drive screw rod 653 to rotate and then drive detection mechanism 654 to move laterally, so that detection mechanism 654 can detect the soil in a larger area at the bottom of the placement plate 1, and can comprehensively detect the humidity of the soil, thereby facilitating the subsequent configuration of the ratio of fertilizer and water.

[0037] The top of the bottom block 61 is fixedly connected to the bottom of the placement plate 1 , and the top of the support plate 1 651 is fixedly connected to the bottom of the rotating shaft 1 64 .

[0038] like Figure 5 As shown, the detection mechanism 654 includes a moving block 6541, the outer surface of the moving block 6541 is fixedly connected to a support rod 6542, the bottom of the support rod 6542 is fixedly connected to a humidity detection device 6543, the bottom of the moving block 6541 is fixedly connected to a telescopic sleeve 6544, the bottom of the telescopic sleeve 6544 is slidably connected to a telescopic rod 6545, the bottom of the telescopic rod 6545 is fixedly connected to a detection head 6546, the bottom of the humidity detection device 6543 is fixedly connected to an electric wire 6548, and the outer surface of the telescopic sleeve 6544 is fixedly connected to an auxiliary mechanism 6547.

[0039] When the servo motor 2 652 drives the screw 653 to rotate and then drives the moving block 6541 to move horizontally, the brush plate 656 will scratch the detection head 6546, thereby removing moisture, minerals, etc. on the detection head 6546, avoiding the detection head 6546 from being covered by impurities or even corroded, making the measured soil moisture data inaccurate. For example, in some saline-alkali environments, salt crystals are easily formed on the surface of the detection head 6546, affecting its normal sensitivity to humidity, and then causing abnormal triggering of irrigation instructions, which may cause crops to lack water or be over-irrigated.

[0040] The inner wall of the moving block 6541 is threadedly connected to the outer surface of the screw rod 653 , and the bottom of the wire 6548 is fixedly connected to the outer surface of the detection head 6546 .

[0041] like Figure 6 As shown, the auxiliary mechanism 6547 includes a support plate 2 65471, the outer surface of the support plate 2 65471 is fixedly connected to a telescopic rod 3 65472, the outer surface of the telescopic rod 3 65472 is fixedly connected to a support plate 3 65473, the top of the support plate 3 65473 is fixedly connected to a partition 65474, the end of the support plate 3 65473 away from the telescopic rod 3 65472 is fixedly connected to a placement rack 65475, a sweeping rod 65476 is placed on the top of the placement rack 65475, and the bottom of the sweeping rod 65476 is fixedly connected to a rotating block 65477.

[0042] After the moving block 6541 stops moving, the telescopic rod 2 6545 will move downward, allowing the detection head 6546 to penetrate into the soil. At the same time, the auxiliary mechanism 6547 also starts working, and the telescopic rod 3 65472 will push the support plate 2 65471 to move outward, thereby disengaging the sweeping rod 65476 on the placement frame 65475 and rotating the rotating block 65477, so that the sweeping rod 65476 sweeps the surface of the soil before the detection head 6546 enters the soil, sweeping away the stones on the surface of the soil, thereby preventing the detection head 6546 from being unable to extend into the soil.

[0043] The side of the rotating block 65477 away from the sweeping rod 65476 is rotatably connected to the outer surface of the second telescopic rod 6545 , and the outer surface of the second support plate 65471 is fixedly connected to the outer surface of the telescopic sleeve 6544 .

[0044] The specific workflow is as follows:

[0045] During operation, the servo motor 1 63 drives the rotating shaft 1 64 to rotate, thereby controlling the bottom transverse movement mechanism 65 to rotate, and at the same time, the servo motor 2 652 drives the screw rod 653 to rotate, thereby driving the detection mechanism 654 to move laterally, so that the detection mechanism 654 can detect the soil in a larger area at the bottom of the placement plate 1. Before the detection, after the moving block 6541 stops moving, the telescopic rod 2 6545 moves downward to make the detection head 6546 penetrate into the soil. At the same time, the auxiliary mechanism 6547 also starts to work, and the telescopic rod 3 65472 pushes the support plate 2 65471 to move outward, so that the placement frame 654 The sweeping rod 65476 on 75 is disengaged and rotated with the rotating block 65477, so that the sweeping rod 65476 sweeps the surface of the soil before the detection head 6546 enters the soil, sweeping away the stones on the surface of the soil, thereby preventing the detection head 6546 from being unable to extend into the soil. In addition, when the telescopic rod 6545 does not move downward and the moving block 6541 moves along the screw rod 653, the brush plate 656 will rub against the detection head 6546, thereby removing moisture, minerals, etc. on the detection head 6546, thereby preventing the detection head 6546 from being covered by impurities or even corroded, making the measured soil moisture data inaccurate.

[0046] Example 2, using Figure 1-Figure 8 An automatic fertilizer adding device integrating water and fertilizer according to one embodiment of the present invention is described as follows.

[0047] like Figure 7 As shown, an integrated water-fertilizer automatic fertilizing device of the present invention is based on the first embodiment, and the mixing unit 4 includes a mixing bin 41, the bottom of the mixing bin 41 is rotatably connected to a rotating shaft 2 43, the bottom of the rotating shaft 2 43 is fixedly connected to a servo motor 3 42, the outer surface of the rotating shaft 2 43 is fixedly connected to a stirring rod 48, the top of the rotating shaft 2 43 is fixedly connected to a liquid pump 44, the top of the liquid pump 44 is fixedly connected to a liquid spreading plate 45, the outer surface of the liquid pump 44 is fixedly connected to a water pipe 46, and the bottom of the water pipe 46 is fixedly connected to an isolation plate 47.

[0048] The bottom of the mixing bin 41 is fixedly connected to the top of the placement plate 1 , and the outer surface of the servo motor three 42 is fixedly connected to the inner wall of the placement plate 1 .

[0049] like Figure 8 As shown, the storage unit 5 includes a support plate four 51, the top of the support plate four 51 is fixedly connected to a storage box 52, the top of the storage box 52 is rotated to be connected to a flip cover 54, the outer surface of the storage box 52 is fixedly connected to a servo motor four 53, the output end of the servo motor four 53 is fixedly connected to a rotating shaft three 55, the outer surface of the rotating shaft three 55 is evenly provided with toggle plates 56, and the number of the toggle plates 56 is four.

[0050] The servo motor four 53 will drive the rotating shaft three 55 to rotate, and then mix the solidified fertilizer in the storage box 52 into the mixing bin 41 according to a specific amount. After the solidified fertilizer enters the mixing bin 41, the servo motor three 42 will drive the rotating shaft two 43 to rotate, and then the stirring rod 48 will mix the water and fertilizer into liquid fertilizer, which is convenient for subsequent spraying. At the same time, the liquid pump 44 will suck the formed liquid fertilizer into the liquid spreading plate 45 through the water pipe 46. The centrifugal force generated by the rotation will cause the liquid fertilizer to flow out of the liquid spreading plate 45 and sprinkle on the soil.

[0051] The specific workflow is as follows:

[0052] During operation, the servo motor four 53 will drive the rotating shaft three 55 to rotate, and then mix the solidified fertilizer in the storage box 52 into the mixing bin 41 according to a specific amount. After the solidified fertilizer enters the mixing bin 41, the servo motor three 42 will drive the rotating shaft two 43 to rotate, and then the stirring rod 48 will mix the water and fertilizer into liquid fertilizer, which is convenient for subsequent spraying. At the same time, the liquid pump 44 will suck the formed liquid fertilizer into the liquid spreading plate 45 through the water pipe 46. The centrifugal force generated by the rotation will cause the liquid fertilizer to flow out of the liquid spreading plate 45 and sprinkle onto the soil.

[0053] Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field and related fields without creative work should fall within the scope of protection of the present invention. The structures, devices and operating methods not specifically described and explained in the present invention are implemented according to the conventional means in the field unless otherwise specified and limited.

Claims

1. A water-fertilizer integrated automatic fertilizer adding device, comprising a placement plate (1), characterized in that: The bottom of the placement plate (1) is fixedly connected to a support column (2), the bottom of the support column (2) is fixedly connected to a moving wheel (3), the top of the placement plate (1) is fixedly connected to a mixing unit (4), the outer surface of the mixing unit (4) is fixedly connected to a storage unit (5), and the bottom of the placement plate (1) is fixedly connected to a detection unit (6); The detection unit (6) comprises a bottom block (61), the bottom of the bottom block (61) is fixedly connected to a stabilizing plate (62), the outer surface of the stabilizing plate (62) is fixedly connected to a servo motor 1 (63), the output end of the servo motor 1 (63) is fixedly connected to a rotating shaft 1 (64), and the bottom of the rotating shaft 1 (64) is fixedly connected to a transverse movement mechanism (65); The transverse movement mechanism (65) comprises a support plate 1 (651), the outer surface of the support plate 1 (651) is fixedly connected to a servo motor 2 (652), the output end of the servo motor 2 (652) is fixedly connected to a screw rod (653), the outer surface of the screw rod (653) is threadedly connected to a detection mechanism (654), the bottom of the support plate 1 (651) is fixedly connected to a support rod 1 (655), and the bottom of the support rod 1 (655) is fixedly connected to a brush plate (656).

2. The water-fertilizer integrated automatic fertilizer adding device according to claim 1, characterized in that: The top of the bottom block (61) is fixedly connected to the bottom of the placement plate (1), and the top of the support plate 1 (651) is fixedly connected to the bottom of the rotating shaft 1 (64).

3. The water-fertilizer integrated automatic fertilizer adding device according to claim 1, characterized in that: The detection mechanism (654) comprises a moving block (6541), the outer surface of the moving block (6541) is fixedly connected to a second support rod (6542), the bottom of the second support rod (6542) is fixedly connected to a humidity detection device (6543), the bottom of the moving block (6541) is fixedly connected to a telescopic sleeve (6544), the bottom of the telescopic sleeve (6544) is slidably connected to a second telescopic rod (6545), the bottom of the second telescopic rod (6545) is fixedly connected to a detection head (6546), the bottom of the humidity detection device (6543) is fixedly connected to an electric wire (6548), and the outer surface of the telescopic sleeve (6544) is fixedly connected to an auxiliary mechanism (6547).

4. The water-fertilizer integrated automatic fertilizer adding device according to claim 3 is characterized in that: The inner wall of the moving block (6541) is threadedly connected to the outer surface of the screw rod (653), and the bottom of the electric wire (6548) is fixedly connected to the outer surface of the detection head (6546).

5. The water-fertilizer integrated automatic fertilizer adding device according to claim 3, characterized in that: The auxiliary mechanism (6547) includes a support plate 2 (65471), the outer surface of the support plate 2 (65471) is fixedly connected to a telescopic rod 3 (65472), the outer surface of the telescopic rod 3 (65472) is fixedly connected to a support plate 3 (65473), the top of the support plate 3 (65473) is fixedly connected to a partition plate (65474), the end of the support plate 3 (65473) away from the telescopic rod 3 (65472) is fixedly connected to a placement rack (65475), a sweeping rod (65476) is placed on the top of the placement rack (65475), and the bottom of the sweeping rod (65476) is fixedly connected to a rotating block (65477).

6. The water-fertilizer integrated automatic fertilizer adding device according to claim 5, characterized in that: The side of the rotating block (65477) away from the sweeping rod (65476) is rotatably connected to the outer surface of the second telescopic rod (6545), and the outer surface of the second support plate (65471) is fixedly connected to the outer surface of the telescopic sleeve (6544).

7. The water-fertilizer integrated automatic fertilizer adding device according to claim 1, characterized in that: The mixing unit (4) comprises a mixing chamber (41), the bottom of the mixing chamber (41) is rotatably connected to a second rotating shaft (43), the bottom of the second rotating shaft (43) is fixedly connected to a servo motor (42), the outer surface of the second rotating shaft (43) is fixedly connected to a stirring rod (48), the top of the second rotating shaft (43) is fixedly connected to a liquid pump (44), the top of the liquid pump (44) is fixedly connected to a liquid spreading plate (45), the outer surface of the liquid pump (44) is fixedly connected to a water pipe (46), and the bottom of the water pipe (46) is fixedly connected to an isolation plate (47).

8. The water-fertilizer integrated automatic fertilizer adding device according to claim 7, characterized in that: The bottom of the mixing bin (41) is fixedly connected to the top of the placement plate (1), and the outer surface of the servo motor three (42) is fixedly connected to the inner wall of the placement plate (1).

9. The water-fertilizer integrated automatic fertilizer adding device according to claim 1, characterized in that: The storage unit (5) comprises a support plate four (51), the top of the support plate four (51) is fixedly connected to a storage box (52), the top of the storage box (52) is rotated to be connected to a flip cover (54), the outer surface of the storage box (52) is fixedly connected to a servo motor four (53), the output end of the servo motor four (53) is fixedly connected to a rotating shaft three (55), the outer surface of the rotating shaft three (55) is evenly provided with toggle plates (56), and the number of the toggle plates (56) is four.

10. The water-fertilizer integrated automatic fertilizer adding device according to claim 9, characterized in that: The bottom of the support plate four (51) is fixedly connected to the outer surface of the mixing box.

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