UAV rotor performance testing equipment

Abstract

The present invention discloses a drone rotor performance testing device, which relates to the technical field of drones, and comprises a base, wherein the upper part of the base is rotatably provided with a ring gear, and a driving motor is installed inside the base, and the output shaft of the driving motor is located at the inner side of the ring gear and connected with a driving gear, and the driving gear meshes with the ring gear, and a detection auxiliary mechanism is arranged on one side of the ring gear, and the upper part of the base is located at the inner side of the ring gear and provided with a fixed seat, and the upper part of the fixed seat is connected with a fixed column, and the upper end of the fixed column is ball-hinged with a movable column, and the connection between the movable column and the fixed column is fixedly connected by a limit bar. The drone rotor performance testing device can simulate the working state of the drone rotor in various environments when testing the drone rotor, such as severe environments such as strong wind, heavy rain, and sandstorm, so as to better detect the quality of the drone rotor and improve the accuracy of rotor detection.

Description

Technical Field

[0001] The present invention relates to the technical field of unmanned aerial vehicles, in particular to unmanned aerial vehicle rotor performance testing equipment. Background Art

[0002] With the rapid development of UAV technology and the continuous expansion of its application fields, the performance of UAV rotors, as its core component, directly affects the flight performance, stability and safety of UAVs. Therefore, it is crucial to conduct accurate and efficient performance testing of UAV rotors.

[0003] However, there is currently no equipment specifically used to test the performance of UAV rotors. During testing, the lift of the UAV rotor is tested by simply connecting the UAV to a tension sensor. However, this detection method is relatively limited and the test accuracy is not high. Therefore, it is necessary to develop a high-precision device specifically used to test the performance of UAV rotors. Summary of the invention

[0004] In view of the deficiencies in the prior art, the present invention provides a UAV rotor performance testing device, which solves the problem that there is currently no dedicated device for testing UAV rotor performance.

[0005] To achieve the above objectives, the present invention is implemented through the following technical solutions: a UAV rotor performance detection device, comprising a base, a ring gear is rotatably arranged on the upper part of the base, and a drive motor is installed inside the base, the output shaft of the drive motor is located at the inner side of the ring gear and is connected to the drive gear, the drive gear is meshed with the ring gear, a detection auxiliary mechanism is provided on one side of the ring gear, a fixed seat is provided on the upper part of the base at the inner side of the ring gear, a fixed column is connected to the upper part of the fixed seat, a movable column is ball-hinged at the upper end of the fixed column, the connection between the movable column and the fixed column is fixedly connected by a limit strip, and a UAV fixing platform for fixing the UAV is provided at the upper end of the movable column.

[0006] The detection auxiliary mechanism includes a horizontal beam arranged on the outside of the ring gear, a vertical beam is vertically arranged at one end of the horizontal beam away from the ring gear, a limit seat is arranged on the upper end of the vertical beam, a rotating motor is installed on one side of the limit seat, the output shaft of the rotating motor is located on the other side of the limit seat and is connected to a fan corresponding to the drone fixing platform, a material storage mechanism is arranged on the upper side of the limit seat, and the detection auxiliary mechanism also includes a rocking mechanism for shaking the drone.

[0007] Preferably, both ends of the limit strip are connected to one end of the movable column and one end of the fixed column respectively through bolts.

[0008] Preferably, a moving rod corresponding to the cavity is provided at the bottom of the drone fixing platform, and a cavity is provided inside the movable column. An end of the moving rod away from the drone fixing platform slides longitudinally through the upper end of the movable column and is located in the cavity and is connected to a pull rope. A tension sensor is provided on the lower side of the cavity, and an end of the pull rope away from the moving rod is connected to the tension sensor.

[0009] Preferably, the swing mechanism includes a longitudinal displacement sleeve longitudinally slidably sleeved on the outside of the vertical beam, a horizontal displacement sleeve transversely slidably sleeved on the outside of the horizontal beam, a main gear fixedly sleeved on the output shaft of the rotating motor, a gear plate rotatably sleeved on the side of the vertical beam away from the fan, and a rotating sleeve rotatably sleeved on the outside of the movable column. A connecting rod 1 is hinged at the edge of the side of the gear plate away from the vertical beam, the other end of the connecting rod 1 is hinged to one side of the longitudinal displacement sleeve, a convex strip is provided on one side of the rotating sleeve, an opening is provided at one end of the convex strip away from the rotating sleeve, connecting rods 2 and 3 are hinged to the upper parts of both sides of the horizontal displacement sleeve respectively, one end of the connecting rod 2 away from the horizontal displacement sleeve is hinged to the opening of one end of the convex strip through a hinge, and one end of the connecting rod 3 away from the horizontal displacement sleeve is hinged to the side of the longitudinal displacement sleeve away from the connecting rod 1.

[0010] Preferably, the hinge includes grooves arranged on both sides of one end of the connecting rod, an adjustment block is slidably arranged in the groove, one side of the adjustment block is connected to the inner side of the groove by a spring, and the other side of the adjustment block is provided with a positioning shaft adapted to the opening on the convex strip.

[0011] Preferably, when the spring is at its original length, the side of the adjustment block away from the spring is flush with the outer wall of the second connecting rod.

[0012] Preferably, the storage mechanism includes a vertical plate arranged on the upper side of the vertical beam, a water tank and a sand box are respectively arranged on both sides of the vertical plate, a pump is arranged inside the water tank, the output end of the pump is connected to a delivery pipe, and the other end of the delivery pipe is rotatably arranged at the center of the fan away from the vertical beam through a rotating joint.

[0013] Preferably, the interior of the fan is a hollow structure, the rotary joint is communicated with the interior of the fan, and a nozzle is provided on the side of each blade of the fan away from the vertical beam.

[0014] Preferably, a discharge port is provided at the bottom of the sand box, and a feed port is provided at the top of the water tank and the sand box.

[0015] The present invention provides a UAV rotor performance testing device, which has the following beneficial effects compared with the prior art:

[0016] When testing the UAV rotor, the UAV rotor performance testing equipment can simulate the working conditions of the UAV rotor in various environments, such as strong winds, heavy rains, sandstorms and other harsh environments, so as to better detect the quality of the UAV rotor and improve the accuracy of rotor detection.

[0017] When testing the UAV rotor performance testing equipment in a strong wind environment, the rotating motor can drive the swing mechanism to work, so that it can shake the UAV in different directions, thereby testing the stability of the UAV rotor and having strong linkage. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural schematic diagram of the present invention;

[0019] Figure 2 It is a structural schematic diagram of the detection auxiliary mechanism of the present invention;

[0020] Figure 3 It is a structural schematic diagram of the swing mechanism of the present invention;

[0021] Figure 4 It is a structural schematic diagram of the hinge of the present invention;

[0022] Figure 5 It is a schematic diagram of the internal structure of the movable column of the present invention;

[0023] Figure 6 It is a structural schematic diagram of the material storage mechanism of the present invention.

[0024] In the figure: 1, base; 2, ring gear; 3, driving gear; 4, detection auxiliary mechanism; 41, horizontal beam; 42, vertical beam; 43, limit seat; 44, rotating motor; 45, fan; 451, nozzle; 46, storage mechanism; 461, vertical plate; 462, water tank; 463, sand box; 464, conveying pipe; 465, rotating joint; 47, swing mechanism; 471, longitudinal displacement sleeve; 472, horizontal displacement sleeve; 473, main gear ; 474, gear plate; 475, rotating sleeve; 476, connecting rod one; 477, convex strip; 478, hinge; 4781, groove; 4782, adjustment block; 4783, spring; 4784, positioning shaft; 479, connecting rod two; 4710, connecting rod three; 5, fixed seat; 6, fixed column; 7, movable column; 71, cavity; 72, tension sensor; 73, pull rope; 74, moving rod; 8, drone fixing platform; 9, limit strip. DETAILED DESCRIPTION

[0025] 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.

[0026] See also Figure 1-Figure 6 , the present invention provides four technical solutions:

[0027] For example, see Figure 1 In an embodiment of the present invention, a drone rotor performance detection device includes a base 1, a ring gear 2 is rotatably provided on the upper part of the base 1, and a driving motor is installed inside the base 1, the output shaft of the driving motor is located at the inner side of the ring gear 2 and is connected with a driving gear 3, the driving gear 3 is meshed with the ring gear 2, and a detection auxiliary mechanism 4 is provided on one side of the ring gear 2, a fixed seat 5 is provided on the upper part of the base 1 at the inner side of the ring gear 2, a fixed column 6 is connected to the upper part of the fixed seat 5, a movable column 7 is ball-hinged at the upper end of the fixed column 6, the connection between the movable column 7 and the fixed column 6 is fixedly connected by a limit strip 9, and a drone fixing platform 8 for fixing the drone is provided at the upper end of the movable column 7.

[0028] See also Figure 2 In the embodiment of the present invention, the detection auxiliary mechanism 4 includes a horizontal beam 41 arranged on the outside of the ring gear 2, and a vertical beam 42 is vertically arranged at one end of the horizontal beam 41 away from the ring gear 2. A limit seat 43 is arranged at the upper end of the vertical beam 42, and a rotating motor 44 is installed on one side of the limit seat 43. The output shaft of the rotating motor 44 is located at the other side of the limit seat 43 and is connected to a fan 45 corresponding to the drone fixing platform 8. A storage mechanism 46 is arranged on the upper side of the limit seat 43. The detection auxiliary mechanism 4 also includes a swing mechanism 47 for shaking the drone.

[0029] In the above scheme: when the drone rises, the rotating motor 44 drives the fan 45 to rotate, and the fan 45 blows air to the drone, simulating the working state of the drone rotor in windy weather. At the same time, the driving motor inside the base 1 drives the driving gear 3 to rotate, and the driving gear 3 drives the ring gear 2 meshing with it to rotate, and the ring gear 2 drives the detection auxiliary mechanism 4 to rotate, so that the fan 45 blows air to the drone in different directions.

[0030] Furthermore, both ends of the limit bar 9 are connected to one end of the movable column 7 and the fixed column 6 respectively through bolts. The limit bar 9 can connect the movable column 7 and the fixed column 6 so that the movable column 7 and the fixed column 6 cannot move, so that only lift testing can be performed on the drone without environmental testing.

[0031] The second embodiment is different from the first embodiment in that:

[0032] See also Figure 5In the embodiment of the present invention, a moving rod 74 corresponding to the cavity 71 is provided at the bottom of the drone fixing platform 8, and the cavity 71 is provided inside the movable column 7. The end of the moving rod 74 away from the drone fixing platform 8 longitudinally slides through the upper end of the movable column 7 and is located in the cavity 71 and is connected to a pull rope 73. A tension sensor 72 is provided on the lower side of the cavity 71, and the end of the pull rope 73 away from the moving rod 74 is connected to the tension sensor 72.

[0033] In the above scheme: by utilizing the elasticity of spring 4783 and pressing adjusting block 4782, positioning shaft 4784 can be disengaged from positioning holes on both sides of the opening at one end of convex strip 477, so that connecting rod 2 479 and convex strip 477 are not hinged together, and then the UAV is fixed on UAV fixing platform 8 to make the UAV work. When the rotor of the UAV rotates, the rotor drives the UAV to rise, so that the UAV fixing platform 8 drives the moving rod 74 to move upward, and the moving rod 74 causes the pull rope 73 to pull the tension sensor 72 to test the rising force of the UAV rotor.

[0034] Embodiment 3 is different from Embodiment 1 in that:

[0035] See also Figure 3 In the embodiment of the present invention, the swing mechanism 47 includes a longitudinal displacement sleeve 471 longitudinally slidably sleeved on the outside of the vertical beam 42, a horizontal displacement sleeve 472 transversely slidably sleeved on the outside of the horizontal beam 41, a main gear 473 fixedly sleeved on the output shaft of the rotating motor 44, a gear plate 474 rotatably arranged on the side of the vertical beam 42 away from the fan 45, and a rotating sleeve 475 rotatably arranged on the outside of the movable column 7, and a connecting rod 476 is hinged at the edge of the side of the gear plate 474 away from the vertical beam 42, and the other end of the connecting rod 476 is hinged. Connected to one side of the longitudinal displacement sleeve 471, a convex strip 477 is provided on one side of the rotating sleeve 475, and an opening is provided at one end of the convex strip 477 away from the rotating sleeve 475. The upper parts of both sides of the horizontal displacement sleeve 472 are hinged with connecting rod 2 479 and connecting rod 3 4710 respectively. One end of connecting rod 2 479 away from the horizontal displacement sleeve 472 is hinged in one end opening of the convex strip 477 through a hinge 478, and one end of connecting rod 3 4710 away from the horizontal displacement sleeve 472 is hinged to the side of the longitudinal displacement sleeve 471 away from the connecting rod 1 476.

[0036] In the above scheme: by pressing the adjustment block 4782, the positioning shaft 4784 is aligned with the positioning holes on both sides of the inner opening of one end of the convex strip 477, and then the adjustment block 4782 is loosened, the positioning shaft 4784 is inserted into the positioning hole, the second connecting rod 479 is hinged with the convex strip 477, and the limit strip 9 is removed. When the rotating motor 44 rotates, the fan 45 drives the main gear 473 to rotate, and the main gear 473 drives the gear plate 474 meshing with it to rotate, and the gear plate 474 drives the connecting rod 1 476 to drive the longitudinal displacement sleeve 471 to rotate. The vertical beam 42 continuously moves longitudinally and repeatedly, and the longitudinal displacement sleeve 471 causes the connecting rod three 4710 to drive the horizontal displacement sleeve 472 to continuously and repeatedly move laterally on the horizontal beam 41. The horizontal displacement sleeve 472 will cause the connecting rod two 479 to drive the movable column 7 to swing back and forth, thereby shaking the UAV and further testing the quality of the UAV rotor. Since the rotating sleeve 475 is rotatably arranged on the outside of the movable column 7, when the detection auxiliary mechanism 4 rotates, the rocking mechanism 47 will make a circular motion with the UAV and shake the UAV at different positions.

[0037] For further information, see Figure 4 In the embodiment of the present invention, the articulator 478 includes grooves 4781 arranged on both sides of one end of the second connecting rod 479, and an adjusting block 4782 is slidably arranged in the groove 4781. One side of the adjusting block 4782 is connected to the inner side of the groove 4781 by a spring 4783, and the other side of the adjusting block 4782 is provided with a positioning shaft 4784 adapted to the opening on the convex strip 477. By utilizing the elasticity of the spring 4783, the adjusting block 4782 is pressed, so that the positioning shaft 4784 can be inserted into or disengaged from the positioning holes on both sides of the inner opening of one end of the convex strip 477, so that the second connecting rod 479 and the convex strip 477 are hinged together or not hinged together. When the two are hinged together, the UAV can be shaken to test the working condition of the rotor in a shaking state. When the two are not hinged, other tests can be performed on the rotor, and the rocking mechanism 47 does not affect other test work.

[0038] For further information, see Figure 4 In the embodiment of the present invention, when the spring 4783 is at its original length, the side of the adjustment block 4782 away from the spring 4783 is flush with the outer wall of the second connecting rod 479, making it convenient for the second connecting rod 479 to be stuck into the opening on the convex strip 477, thereby hingedly connecting the second connecting rod 479 to the convex strip 477.

[0039] The fourth embodiment is different from the first embodiment in that:

[0040] See also Figure 2 and Figure 6In the embodiment of the present invention, the material storage mechanism 46 includes a vertical plate 461 arranged on the upper side of the vertical beam 42, and a water tank 462 and a sand box 463 are respectively arranged on both sides of the vertical plate 461. A pump is arranged inside the water tank 462, and the output end of the pump is connected to a delivery pipe 464. The other end of the delivery pipe 464 is rotatably arranged at the center of the fan 45 away from the vertical beam 42 through a rotating joint 465.

[0041] See also Figure 2 and Figure 6 In the embodiment of the present invention, the interior of the fan 45 is a hollow structure, the rotary joint 465 is connected to the interior of the fan 45, and a nozzle 451 is provided on the side of each blade of the fan 45 away from the vertical beam 42.

[0042] In the above scheme: the pump inside the water tank 462 draws water into the fan 45 through the delivery pipe 464, and then sprays it out from the nozzle 451 on the blades of the fan 45 to the drone. Under the blowing of the fan 45, the influence of windy and rainy weather on the rotor of the drone can be simulated. Then, the discharge port at the bottom of the sand box 463 is opened, and the sand inside the sand box 463 will fall. When it falls in front of the fan 45, the fan 45 blows the sand toward the drone, simulating the influence of the wind and sand environment on the rotor of the drone.

[0043] For further information, see Figure 6 In the embodiment of the present invention, a discharge port is provided at the bottom of the sand box 463, and the discharge port is convenient for sand to fall down to simulate sandy weather, and feed ports are provided at the top of the water tank 462 and the sand box 463, and the discharge port is convenient for adding sand or water.

[0044] Working principle: By utilizing the elasticity of the spring 4783 and pressing the adjustment block 4782, the positioning shaft 4784 can be disengaged from the positioning holes on both sides of the inner opening of one end of the convex strip 477, so that the second connecting rod 479 and the convex strip 477 are not hinged together, and then the drone is fixed on the drone fixing platform 8 to make the drone work. When the rotor of the drone rotates, the rotor drives the drone to rise, so that the drone fixing platform 8 drives the moving rod 74 to move upward, and the moving rod 74 will make the pull rope 73 pull the tension sensor 72 to test the rising force of the drone rotor;

[0045] When the drone ascends, the rotating motor 44 drives the fan 45 to rotate, and the fan 45 blows air to the drone, simulating the working state of the drone rotor in windy weather. At the same time, the driving motor inside the base 1 drives the driving gear 3 to rotate, and the driving gear 3 drives the ring gear 2 meshing with it to rotate, and the ring gear 2 drives the detection auxiliary mechanism 4 to rotate, so that the fan 45 blows air to the drone in different directions;

[0046] By pressing the adjusting block 4782 again, the positioning shaft 4784 is aligned with the positioning holes on both sides of the inner opening of one end of the convex strip 477, and then the adjusting block 4782 is loosened, the positioning shaft 4784 is inserted into the positioning hole, the second connecting rod 479 is hinged with the convex strip 477, and the limit strip 9 is removed. When the rotating motor 44 rotates, the fan 45 drives the main gear 473 to rotate, and the main gear 473 drives the gear plate 474 engaged with it to rotate, and the gear plate 474 drives the connecting rod 1 476 to drive the longitudinal displacement sleeve 471 on the vertical beam. 42 continuously moves longitudinally and repeatedly, the longitudinal displacement sleeve 471 makes the connecting rod 3 4710 drive the horizontal displacement sleeve 472 to continuously and repeatedly move laterally on the horizontal beam 41, and the horizontal displacement sleeve 472 will make the connecting rod 2 479 drive the movable column 7 to swing back and forth, thereby shaking the UAV, and further testing the quality of the UAV rotor. Since the rotating sleeve 475 is rotatably arranged outside the movable column 7, when the detection auxiliary mechanism 4 rotates, the rocking mechanism 47 will make a circular motion with the UAV, shaking the UAV at different positions;

[0047] During the test, the pump inside the water tank 462 draws water into the fan 45 through the delivery pipe 464, and then sprays water from the nozzle 451 on the blades of the fan 45 to the drone. Under the blowing of the fan 45, the influence of windy and rainy weather on the rotor of the drone can be simulated. Then, the discharge port at the bottom of the sand box 463 is opened, and the sand inside the sand box 463 will fall. When it falls in front of the fan 45, the fan 45 blows the sand toward the drone, simulating the influence of the windy and sandy environment on the rotor of the drone.

[0048] Meanwhile, the contents not described in detail in this specification belong to the prior art known to those skilled in the art.

Claims

1. An unmanned aerial vehicle rotor performance testing device, comprising a base (1), characterized in that: The upper part of the base (1) is rotatably provided with a ring gear (2), and a driving motor is installed inside the base (1); the output shaft of the driving motor is located at the inner side of the ring gear (2) and is connected to a driving gear (3); the driving gear (3) is meshed with the ring gear (2); a detection auxiliary mechanism (4) is provided on one side of the ring gear (2); a fixing seat (5) is provided at the upper part of the base (1) and is located at the inner side of the ring gear (2); a fixing column (6) is connected to the upper part of the fixing seat (5); a movable column (7) is ball-jointed at the upper end of the fixing column (6); the connection between the movable column (7) and the fixing column (6) is fixedly connected by a limit bar (9); and a drone fixing platform (8) for fixing the drone is provided at the upper end of the movable column (7); The detection auxiliary mechanism (4) comprises a horizontal beam (41) arranged outside the ring gear (2); a vertical beam (42) is vertically arranged at one end of the horizontal beam (41) away from the ring gear (2); a limit seat (43) is arranged at the upper end of the vertical beam (42); a rotating motor (44) is installed on one side of the limit seat (43); an output shaft of the rotating motor (44) is located at the other side of the limit seat (43) and is connected to a fan (45) corresponding to the drone fixing platform (8); a material storage mechanism (46) is arranged on the upper side of the limit seat (43); and the detection auxiliary mechanism (4) further comprises a rocking mechanism (47) for rocking the drone; The swing mechanism (47) comprises a longitudinal displacement sleeve (471) longitudinally slidably sleeved on the outside of the vertical beam (42), a horizontal displacement sleeve (472) transversely slidably sleeved on the outside of the horizontal beam (41), a main gear (473) fixedly sleeved on the output shaft of the rotating motor (44), a gear plate (474) rotatably arranged on a side of the vertical beam (42) away from the fan (45), and a rotating sleeve (475) rotatably arranged on the outside of the movable column (7), a connecting rod (476) being hingedly connected at an edge of a side of the gear plate (474) away from the vertical beam (42), and the other end of the connecting rod (476) being hingedly connected to the longitudinal displacement sleeve. A convex strip (477) is provided on one side of the sleeve (471) and a convex strip (477) is provided on one side of the rotating sleeve (475); an opening is provided on one end of the convex strip (477) away from the rotating sleeve (475); a second connecting rod (479) and a third connecting rod (4710) are hingedly connected to the upper parts of both sides of the horizontal displacement sleeve (472); an end of the second connecting rod (479) away from the horizontal displacement sleeve (472) is hingedly connected to the opening of one end of the convex strip (477) through a hinge (478); and an end of the third connecting rod (4710) away from the horizontal displacement sleeve (472) is hingedly connected to a side of the longitudinal displacement sleeve (471) away from the first connecting rod (476); The hinge (478) comprises grooves (4781) arranged on both sides of one end of the second connecting rod (479), an adjusting block (4782) is slidably arranged in the groove (4781), one side of the adjusting block (4782) is connected to the inner side of the groove (4781) via a spring (4783), and a positioning shaft (4784) adapted to the opening on the convex strip (477) is arranged on the other side of the adjusting block (4782); When the spring (4783) is at its original length, the side of the adjustment block (4782) away from the spring (4783) is flush with the outer wall of the second connecting rod (479).

2. The UAV rotor performance testing device according to claim 1 is characterized in that: Both ends of the limit strip (9) are connected to one end of the movable column (7) and the fixed column (6) respectively by bolts.

3. The UAV rotor performance testing device according to claim 1 is characterized in that: A moving rod (74) corresponding to the cavity (71) is arranged at the bottom of the drone fixing platform (8); the cavity (71) is arranged inside the movable column (7); one end of the moving rod (74) away from the drone fixing platform (8) longitudinally slides through the upper end of the movable column (7) and is located in the cavity (71) and is connected to a pull rope (73); a tension sensor (72) is arranged on the lower side of the cavity (71); and one end of the pull rope (73) away from the moving rod (74) is connected to the tension sensor (72).

4. The UAV rotor performance testing device according to claim 1, characterized in that: The material storage mechanism (46) comprises a vertical plate (461) arranged on the upper side of the vertical beam (42); a water tank (462) and a sand box (463) are respectively arranged on both sides of the vertical plate (461); a pump is arranged inside the water tank (462); an output end of the pump is connected to a delivery pipe (464); the other end of the delivery pipe (464) is rotatably arranged at the center of a side of the fan (45) away from the vertical beam (42) via a rotating joint (465).

5. The UAV rotor performance testing device according to claim 4 is characterized in that: The interior of the fan (45) is a hollow structure, the rotary joint (465) is in communication with the interior of the fan (45), and a nozzle (451) is provided on a side of each blade of the fan (45) away from the vertical beam (42).

6. The UAV rotor performance testing device according to claim 4, characterized in that: The bottom of the sand box (463) is provided with a discharge port, and the upper parts of the water tank (462) and the sand box (463) are both provided with a feed port.

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