Agricultural irrigation device with water-saving function

Abstract

The present application relates to the field of agricultural irrigation technology, especially to a kind of agricultural irrigation device with water-saving function.The present application provides a kind of agricultural irrigation device with water-saving function, which can effectively improve the stability of unmanned vehicle, avoid the inclination of rotating arm, and ensure the irrigation effect on crops.A kind of agricultural irrigation device with water-saving function, comprising unmanned vehicle, water tank, water pump and U-shaped frame, etc., the left side of unmanned vehicle is connected with water tank, the right part of unmanned vehicle is connected with water pump, water pump is connected with water tank, and the middle part of unmanned vehicle is rotatably connected with U-shaped frame.The present application drives screw rod to rotate by starting first servo motor, makes piston plate move right on guide rod, so that piston plate pushes water in water tank to move right, which can effectively improve the stability of unmanned vehicle, avoid the inclination of rotating arm, and ensure the irrigation effect on crops.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of agricultural irrigation technology, and particularly relates to an agricultural irrigation device with water-saving function. BACKGROUND

[0002] The agricultural irrigation device is a device system used in agricultural planting areas such as farmland, orchard, vegetable garden, greenhouse, etc. to supplement insufficient natural precipitation and ensure water supply for crop growth.

[0003] The existing agricultural irrigation device is to move the water tank to the farmland by the mobile vehicle, then the water pump is used to pump out the water, and then the water is sprayed on the crops by the spray head. However, due to the uneven terrain of the farmland, when the water in the water tank is reduced, the remaining water is easy to shake inside the water tank, which causes the mobile vehicle to shake greatly, and the spray head is tilted, which further causes the uneven spraying range and affects the irrigation effect on the crops.

[0004] Therefore, the present application provides an agricultural irrigation device with water-saving function, which can effectively improve the stability of the unmanned vehicle, avoid the tilting of the rotating arm, and ensure the irrigation effect on the crops. SUMMARY

[0005] In order to overcome the shortcomings of the existing agricultural irrigation device that when the water in the water tank is reduced, the remaining water is easy to shake inside the water tank, which causes the mobile vehicle to shake greatly, and the spray head is tilted, which further causes the uneven spraying range and affects the irrigation effect on the crops, the present application provides an agricultural irrigation device with water-saving function, which can effectively improve the stability of the unmanned vehicle, avoid the tilting of the rotating arm, and ensure the irrigation effect on the crops.

[0006] Technical scheme: An agricultural irrigation device with water-saving function comprises an unmanned vehicle, a water tank, a water pump, a U-shaped frame, a limiting mechanism, a swinging mechanism and a balancing mechanism. The left upper side of the unmanned vehicle is connected with the water tank, the right part of the unmanned vehicle is connected with the water pump, the water pump is connected with the water tank, the middle part of the unmanned vehicle is rotationally connected with the U-shaped frame, the water tank is provided with the limiting mechanism capable of limiting the activity space of the water, the U-shaped frame is provided with the swinging mechanism capable of irrigating the crops in a large range, and the U-shaped frame is further provided with the balancing mechanism capable of avoiding damage to the crops and uneven irrigation.

[0007] In a preferred embodiment of the present application, the front and rear parts of the unmanned vehicle are provided with two left and right moving wheels.

[0008] In a preferred embodiment of the present application, the limiting mechanism comprises a first servo motor, a guide rod, a lead screw and a piston plate, the left side of the water tank is connected with the first servo motor, the inside of the water tank is connected with two guide rods, the output shaft of the first servo motor is connected with the lead screw, the lead screw is rotatably connected with the water tank, the piston plate is slidably connected between the guide rods, the piston plate is threadedly connected with the lead screw, the piston plate is in contact with the inner wall of the water tank, the first servo motor is started to drive the lead screw to rotate, so that the piston plate moves rightwards on the guide rods, and the water in the water tank is pushed rightwards by the piston plate.

[0009] In a preferred embodiment of the present application, the swinging mechanism comprises a rotating arm, a spray head, a shunt water pipe, a first sliding frame and a space cam, the upper sides of the front and rear parts of the U-shaped frame are rotatably connected with the rotating arms, the rotating arms are rotatably connected with the spray heads, the adjacent four spray heads are connected with the shunt water pipes, the shunt water pipes are connected with the water pump, the first sliding frame is slidably connected with the upper part of the U-shaped frame, the right side of the lead screw is connected with the space cam, the first sliding frame is in contact with the space cam, the rotating arms are movably connected with the first sliding frame, the lead screw rotates to drive the space cam to rotate, so that the first sliding frame moves leftward and rightward to push the rotating arms to swing.

[0010] In a preferred embodiment of the present application, the balancing mechanism comprises a gear ring, a gear, a second servo motor and a balancing module, the front side of the U-shaped frame is connected with the gear ring, the right front part of the unmanned vehicle is connected with the second servo motor, the output shaft of the second servo motor is connected with the gear, the gear is engaged with the gear ring, and the upper side of the second servo motor is connected with the balancing module, when the unmanned vehicle tilts, the balancing module controls the second servo motor to start, drives the gear to rotate and engage with the gear ring to move, so that the U-shaped frame rotates, and the rotating arm is always kept horizontal with the ground.

[0011] In a preferred embodiment of the present application, the suction mechanism comprises a rotating elbow, a sliding elbow, an extension tube, a connecting tube and a one-way valve, the right part of the water tank is rotatably connected with the rotating elbow, the rotating elbow penetrates through the unmanned vehicle, the sliding elbow is slidably connected with the rotating elbow, the extension tube is connected with the lower side of the sliding elbow, the connecting tube is connected with the lower side of the extension tube, and the one-way valve is connected with the inside of the rotating elbow, the rotating elbow is rotated to extend the sliding elbow, stretch the extension tube, place the connecting tube in water, then move the piston plate leftward, so that the water is sucked into the water tank, and the one-way valve prevents the water in the water tank from flowing out.

[0012] In a preferred embodiment of the present application, a range mechanism is further included, the range mechanism comprising guide sleeves, second sliding frames, springs, guide frames and connecting frames, the upper sides of the rotating arms are connected with the guide sleeves, the second sliding frames are slidably connected with the guide sleeves, the springs are connected between the second sliding frames and the connected guide sleeves, the right upper parts of the U-shaped frames are connected with the guide frames, the second sliding frames are in contact with the guide frames, the nozzles are connected with the connecting frames, the connecting frames are movably connected with the adjacent second sliding frames, the rotating arms swing, driving the guide sleeves and the second sliding frames to swing, when the second sliding frames contact the protrusions on the guide frames, the second sliding frames move outward, the springs are extruded and contracted, when the second sliding frames are separated from the protrusions on the guide frames, the springs rebound, driving the second sliding frames to reset, so that the second sliding frames move back and forth, while the second sliding frames move back and forth, driving the connecting frames to move, so that the nozzles move.

[0013] In a preferred embodiment of the present application, a windproof mechanism is further included, the windproof mechanism comprising connecting baffles, sliding plates and adjusting screws, the left and right sides of the rotating arms are connected with the connecting baffles, the sliding plates are slidably connected with the connecting baffles, the adjusting screws are threadedly connected in the middle parts of the connecting baffles, and the adjusting screws are rotatably connected with the adjacent sliding plates, rotating the adjusting screws to drive the sliding plates to move downward above the crops, so that the sliding plates and the connecting baffles shield the sprayed water.

[0014] In a preferred embodiment of the present application, the connecting baffles are installed in an inclined manner.

[0015] In a preferred embodiment of the present application, knobs are arranged on the adjusting screws.

[0016] Compared with the prior art, the present application has the following advantages: 1. The first servo motor is started to drive the lead screw to rotate, so that the piston plate moves right on the guide rod, and the water in the water tank is pushed right by the piston plate, which can effectively improve the stability of the unmanned vehicle, avoid the inclination of the rotating arm, and ensure the irrigation effect on crops.

[0017] 2. The lead screw rotates to drive the space cam to rotate, so that the first sliding frame moves left and right to drive the rotating arm to swing, which can expand the spraying range of the nozzle and improve the uniformity and efficiency of irrigation.

[0018] 3. The rotating elbow pipe is rotated, the sliding elbow pipe is lengthened, the telescopic pipe is stretched, the connecting pipe is placed in water, then the piston plate moves left, and the water is sucked into the water tank, which can supplement the water in the water tank on site, save irrigation time and cost.

[0019] 4、The second sliding frame moves back and forth, and drives the connecting frame to move, so that the spray head moves, which can make the spray head swing, further improve the uniformity and efficiency of irrigation.

[0020] 5、The sliding plate is moved downward above crops by rotating the adjusting screw, so that the sliding plate and the connecting baffle shield the sprayed water, which can avoid the influence of wind on the trajectory of water, and maintain the stability and uniformity of spraying. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 It is a perspective view of the present application.

[0022] Figure 2 It is a sectional view of the present application.

[0023] Figure 3 It is a perspective view of the limiting mechanism of the present application.

[0024] Figure 4 It is a perspective view of the swing mechanism of the present application.

[0025] Figure 5 It is a sectional view of the swing mechanism of the present application.

[0026] Figure 6 It is a perspective view of part of the swing mechanism of the present application.

[0027] Figure 7 It is a perspective view of the suction mechanism of the present application.

[0028] Figure 8 It is a sectional view of the suction mechanism of the present application.

[0029] Figure 9 It is a perspective view of the range mechanism of the present application.

[0030] Figure 10 It is an enlarged view of A of the present application.

[0031] Figure 11 It is a perspective view of part of the range mechanism of the present application.

[0032] Figure 12 It is a perspective view of the windproof mechanism of the present application.

[0033] Figure 13 It is a perspective view of the balance mechanism of the present application.

[0034] In the figure: 1, unmanned vehicle, 2, water tank, 3, water pump, 4, U-shaped frame, 5, limiting mechanism, 51, first servo motor, 52, guide rod, 53, screw rod, 54, piston plate, 6, swing mechanism, 61, rotating arm, 62, spray head, 63, shunt water pipe, 64, first sliding frame, 65, space cam, 7, suction mechanism, 71, rotating elbow, 72, sliding elbow, 73, telescopic pipe, 74, connecting pipe, 75, one-way valve, 8, range mechanism, 81, guide sleeve, 82, second sliding frame, 83, spring, 84, guide frame, 85, connecting frame, 9, windproof mechanism, 91, connecting baffle, 92, sliding plate, 93, adjusting screw, 10, balancing mechanism, 101, gear ring, 102, gear, 103, second servo motor, 104, balancing module. DETAILED DESCRIPTION

[0035] Although the present application can be described in relation to a particular application or industry, those skilled in the art will recognize a broader applicability of the present application. Those of ordinary skill in the art will recognize that terms such as: above, below, upper, lower, and the like are used as descriptions of relative positioning with respect to the figures and not as limitations on the scope of the application as defined by the appended claims. Any numerical designations such as: first or second are illustrative only and are not intended to limit the scope of the application in any way.

[0036] An agricultural irrigation device with water-saving function, as shown in Figure 1 and Figure 2 , comprising unmanned vehicle 1, water tank 2, water pump 3, U-shaped frame 4, limiting mechanism 5, swing mechanism 6 and balancing mechanism 10, the left upper side of unmanned vehicle 1 is connected with water tank 2, the front and rear parts of unmanned vehicle 1 are provided with two moving wheels on the left and right sides, which facilitates movement, the right part of unmanned vehicle 1 is connected with water pump 3, water pump 3 is connected with water tank 2, the middle part of unmanned vehicle 1 is rotatably connected with U-shaped frame 4, water tank 2 is provided with limiting mechanism 5, U-shaped frame 4 is provided with swing mechanism 6, and U-shaped frame 4 is also provided with balancing mechanism 10.

[0037] As shown in Figure 1 and Figure 3 , limiting mechanism 5 comprises first servo motor 51, guide rod 52, screw rod 53 and piston plate 54, the left side of water tank 2 is connected with first servo motor 51, the inside of water tank 2 is connected with two guide rods 52, the output shaft of first servo motor 51 is connected with screw rod 53, screw rod 53 is rotatably connected with water tank 2, piston plate 54 is slidably connected between guide rods 52, piston plate 54 is threadedly connected with screw rod 53, and piston plate 54 is in contact with the inner wall of water tank 2.

[0038] As shown in Figure 1 , Figure 4 , Figure 5 and Figure 6As shown, the swing mechanism 6 includes a rotating arm 61, a spray head 62, a shunt pipe 63, a first sliding frame 64 and a space cam 65, the rotating arm 61 is rotatably connected to the upper side of the front and rear parts of the U-shaped frame 4, the four spray heads 62 are rotatably connected to the rotating arm 61, the shunt pipe 63 is connected between adjacent four spray heads 62, the shunt pipe 63 is connected with the water pump 3, the first sliding frame 64 is slidably connected to the upper part of the U-shaped frame 4, the space cam 65 is connected to the right side of the lead screw 53, the first sliding frame 64 is in contact with the space cam 65, and the rotating arm 61 is movably connected with the first sliding frame 64.

[0039] As shown in Figure 1 and Figure 13 , the balance mechanism 10 includes a gear ring 101, a gear 102, a second servo motor 103 and a balance module 104, the gear ring 101 is connected to the front side of the U-shaped frame 4, the second servo motor 103 is connected to the upper side of the right front part of the unmanned vehicle 1, the gear 102 is connected to the output shaft of the second servo motor 103, the gear 102 is engaged with the gear ring 101, and the balance module 104 is connected to the upper side of the second servo motor 103.

[0040] When the present application is used, first, water is poured into the water tank 2, and then the unmanned vehicle 1 is moved to the farmland by moving the wheels, while the unmanned vehicle 1 moves in the farmland, the water pump 3 is started to pump the water in the water tank 2 into the shunt pipe 63, and then the water is flowed to the spray head 62 through the shunt pipe 63, so that the spray head 62 sprays water onto crops, when the water in the water tank 2 is pumped out, the first servo motor 51 is started to drive the lead screw 53 to rotate, so that the piston plate 54 moves to the right on the guide rod 52, so that the piston plate 54 pushes the water in the water tank 2 to move to the right, when the unmanned vehicle 1 is tilted, the balance module 104 controls the second servo motor 103 to start, drives the gear 102 to rotate and engages with the gear ring 101 to move, so that the U-shaped frame 4 rotates, controls the rotating arm 61 to always keep horizontal with the ground, thereby effectively improving the stability of the unmanned vehicle 1, avoiding the tilting of the rotating arm 61, and ensuring the irrigation effect on crops, while the lead screw 53 rotates, the space cam 65 rotates, so that the first sliding frame 64 moves left and right to push the rotating arm 61 to swing, thereby expanding the spraying range of the spray head 62 and improving the uniformity and efficiency of irrigation.

[0041] As shown in Figure 1 , Figure 7 and Figure 8As shown, it also includes the suction mechanism 7, which includes a rotating elbow 71, a sliding elbow 72, an extension tube 73, a connecting tube 74 and a one-way valve 75. The rotating elbow 71 is rotatably connected to the lower right side of the water tank 2 and penetrates the unmanned vehicle 1. The sliding elbow 72 is slidably connected to the rotating elbow 71. The extension tube 73 is connected to the lower side of the sliding elbow 72. The connecting tube 74 is connected to the lower side of the extension tube 73. The one-way valve 75 is connected inside the rotating elbow 71.

[0042] The suction mechanism 7 of the device can supplement the water in the water tank 2. When the water in the water tank 2 is insufficient, the unmanned vehicle 1 is moved to the vicinity of the water source. Then, the rotating elbow 71 is rotated, the sliding elbow 72 is extended, the extension tube 73 is stretched, the connecting tube 74 is placed in the water, and then the piston plate 54 is moved to the left, so that the water is sucked into the water tank 2. The one-way valve 75 prevents the water in the water tank 2 from flowing out, thereby achieving the effect of supplementing the water in the water tank 2 on site, saving irrigation time and cost.

[0043] As shown in Figure 1 , Figure 9 , Figure 10 and Figure 11 , it also includes the range mechanism 8, which includes a guide sleeve 81, a second sliding frame 82, a spring 83, a guide frame 84 and a connecting frame 85. The guide sleeve 81 is connected to the upper side of the rotating arm 61. The second sliding frame 82 is slidably connected to the guide sleeve 81. The spring 83 is connected between the second sliding frame 82 and the guide sleeve 81. The guide frame 84 is connected to the upper right part of the U-shaped frame 4. The second sliding frame 82 is in contact with the guide frame 84. The connecting frame 85 is connected to the nozzle 62 and movably connected to the adjacent second sliding frame 82.

[0044] The range mechanism 8 of the device can expand the spraying range of the nozzle 62. When the rotating arm 61 swings, the guide sleeve 81 and the second sliding frame 82 also swing. When the second sliding frame 82 contacts the protrusion on the guide frame 84, the second sliding frame 82 moves outward, and the spring 83 is compressed and contracted. When the second sliding frame 82 is separated from the protrusion on the guide frame 84, the spring 83 rebounds and drives the second sliding frame 82 to reset. The second sliding frame 82 moves back and forth, and the connecting frame 85 moves, so that the nozzle 62 moves, thereby achieving the effect of swinging the nozzle 62 and further improving the uniformity and efficiency of irrigation.

[0045] As shown in Figure 1 and Figure 12As shown, the windproof mechanism 9 is further included, the windproof mechanism 9 includes the connecting baffle 91, the sliding plate 92 and the adjusting screw 93, the connecting baffle 91 is connected to the left and right sides of the rotating arm 61, the connecting baffle 91 is in an inclined installation mode, avoiding shielding the spraying range of the spray head 62, the sliding plate 92 is slidably connected to the connecting baffle 91, the adjusting screw 93 is threadedly connected to the middle part of the connecting baffle 91, the adjusting screw 93 is provided with a knob, being convenient to rotate, and the adjusting screw 93 is rotatably connected to the adjacent sliding plate 92.

[0046] The windproof mechanism 9 of the device can prevent the wind from affecting the spraying position of water, when the wind force in the environment is large, the adjusting screw 93 is rotated, the sliding plate 92 is moved downwards to above the crops, the sliding plate 92 and the connecting baffle 91 shield the sprayed water, thereby avoiding the wind force affecting the trajectory of the water, maintaining the stability and uniformity of the spraying.

[0047] The above embodiments are provided for those skilled in the art to implement or use the present application, those skilled in the art can make various modifications or changes to the above embodiments without departing from the inventive concept of the present application, therefore the protection scope of the present application is not limited by the above embodiments, but should be the maximum scope meeting the innovative features mentioned in the claims.

Claims

1. An agricultural irrigation device with water-saving function, characterized in that, It includes an unmanned vehicle (1), a water tank (2), a water pump (3), a U-shaped frame (4), a limiting mechanism (5), a swinging mechanism (6), and a balancing mechanism (10). The water tank (2) is connected to the upper left side of the unmanned vehicle (1), and the water pump (3) is connected to the right side of the unmanned vehicle (1). The water pump (3) is connected to the water tank (2). The U-shaped frame (4) is rotatably connected to the middle of the unmanned vehicle (1). The water tank (2) is equipped with a limiting mechanism (5) that can limit the movement space of the water. The U-shaped frame (4) is equipped with a swinging mechanism (6) that can irrigate crops over a wide area. The U-shaped frame (4) is also equipped with a balancing mechanism (10) that can prevent damage to crops and uneven irrigation. The limiting mechanism (5) includes a first servo motor (51), a guide rod (52), a lead screw (53), and a piston plate (54). The first servo motor (51) is connected to the left side of the water tank (2). Two guide rods (52) are connected inside the water tank (2). The lead screw (53) is connected to the output shaft of the first servo motor (51). The lead screw (53) is rotatably connected to the water tank (2). The piston plate (54) is slidably connected between the guide rods (52). The piston plate (54) is threadedly connected to the lead screw (53). The piston plate (54) contacts the inner wall of the water tank (2). When the first servo motor (51) is started, the lead screw (53) is driven to rotate, causing the piston plate (54) to move to the right on the guide rod (52), so that the piston plate (54) pushes the water in the water tank (2) to move to the right. The swing mechanism (6) includes a rotating arm (61), a nozzle (62), a water pipe (63), a first sliding frame (64), and a spatial cam (65). The upper sides of the front and rear parts of the U-shaped frame (4) are rotatably connected to the rotating arm (61). Multiple nozzles (62) are rotatably connected to the rotating arm (61). A water pipe (63) is connected between each of the four adjacent nozzles (62). The water pipe (63) is connected to the water pump (3). The upper part of the U-shaped frame (4) is slidably connected to the first sliding frame (64). The right side of the screw (53) is connected to the spatial cam (65). The first sliding frame (64) and the spatial cam (65) are in contact and cooperate. The rotating arm (61) is movably connected to the first sliding frame (64). When the screw (53) rotates, it drives the spatial cam (65) to rotate, so that the first sliding frame (64) moves left and right to push the rotating arm (61) to swing.

2. An agricultural irrigation device with water-saving function according to claim 1, characterized in that, The unmanned vehicle (1) has two wheels on the left and right sides at both the front and rear.

3. An agricultural irrigation device with water-saving function according to claim 2, characterized in that, The balancing mechanism (10) includes a gear ring (101), a gear (102), a second servo motor (103), and a balancing module (104). The gear ring (101) is connected to the front of the U-shaped frame (4), and the second servo motor (103) is connected to the upper right front of the unmanned vehicle (1). The gear (102) is connected to the output shaft of the second servo motor (103). The gear (102) meshes with the gear ring (101). The balancing module (104) is connected to the upper side of the second servo motor (103). When the unmanned vehicle (1) tilts, the balancing module (104) controls the second servo motor (103) to start, driving the gear (102) to rotate and mesh with the gear ring (101), causing the U-shaped frame (4) to rotate, and controlling the rotating arm (61) to always remain horizontal with the ground.

4. An agricultural irrigation device with water-saving function according to claim 3, characterized in that, It also includes a suction mechanism (7), which includes a rotary bend (71), a sliding bend (72), a telescopic tube (73), a connecting tube (74), and a one-way valve (75). The rotary bend (71) is rotatably connected to the lower right side of the water tank (2). The rotary bend (71) passes through the unmanned vehicle (1). The sliding bend (72) is slidably connected to the rotary bend (71). The telescopic tube (73) is connected to the lower side of the sliding bend (72). The connecting tube (74) is connected to the lower side of the telescopic tube (73). The one-way valve (75) is connected inside the rotary bend (71). By rotating the rotary bend (71), the sliding bend (72) is extended, the telescopic tube (73) is stretched, and the connecting tube (74) is placed in the water. Then, the piston plate (54) is moved to the left, so that water is sucked into the water tank (2). The one-way valve (75) prevents the water in the water tank (2) from flowing out.

5. An agricultural irrigation device with water-saving function according to claim 4, characterized in that, It also includes a range mechanism (8), which includes a guide sleeve (81), a second sliding frame (82), a spring (83), a guide frame (84), and a connecting frame (85). The upper side of the rotating arm (61) is connected to the guide sleeve (81), and the second sliding frame (82) is slidably connected to the guide sleeve (81). The second sliding frame (82) is connected to the guide sleeve (81) with a spring (83). The upper right part of the U-shaped frame (4) is connected to the guide frame (84), and the second sliding frame (82) is in contact with the guide frame (84). The nozzle (62) is connected to the connecting frame (85), and the connecting frame (85) is connected to the guide frame (84). The adjacent second sliding frame (82) is movably connected. When the rotating arm (61) swings, it drives the guide sleeve (81) and the second sliding frame (82) to swing. When the second sliding frame (82) contacts the protrusion on the guide frame (84), the second sliding frame (82) moves outward and the spring (83) is compressed and contracted. When the second sliding frame (82) is separated from the protrusion on the guide frame (84), the spring (83) rebounds and drives the second sliding frame (82) to reset, so that the second sliding frame (82) moves back and forth. When the second sliding frame (82) moves back and forth, it drives the connecting frame (85) to move, so that the nozzle (62) moves.

6. An agricultural irrigation device with water-saving function according to claim 5, characterized in that, It also includes a windproof mechanism (9), which includes a connecting baffle (91), a sliding plate (92) and an adjusting screw (93). The rotating arm (61) is connected to the connecting baffle (91) on both sides. The connecting baffle (91) is slidably connected to the sliding plate (92). The connecting baffle (91) is threadedly connected to the middle of the connecting baffle (91). The adjusting screw (93) is rotatably connected to the adjacent sliding plate (92). Rotating the adjusting screw (93) causes the sliding plate (92) to move downwards above the crops, so that the sliding plate (92) and the connecting baffle (91) block the sprayed water.

7. An agricultural irrigation device with water-saving function according to claim 6, characterized in that, All connecting baffles (91) are installed at an angle.

8. An agricultural irrigation device with water-saving function according to claim 7, characterized in that, A knob is provided on each adjusting screw (93).

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