Polishing device for infrared instrument front cover machining

Abstract

The invention relates to the field of polishing, in particular to a polishing device for infrared instrument front cover machining. An existing front polishing device of the infrared instrument is inconvenient to polish the inner side of a front cover of the infrared instrument, the polishing efficiency is low, meanwhile, the front cover of the infrared instrument is not stable enough in limiting, the front cover is prone to shaking during polishing, and therefore the polishing quality of the front cover of the infrared instrument is affected. A polishing device for infrared instrument front cover machining comprises a base and the like. A supporting plate is fixedly connected to the base, a servo motor is fixedly connected to the supporting plate, a lifting mechanism is arranged on the supporting plate, and an infrared instrument front cover is placed on the lifting mechanism. The two sliding clamping frames continue to move in the direction close to the infrared instrument front cover along the two inclined grooves in the fixed guide frame, a rubber pad is compressed, the rubber pad clamps the infrared instrument front cover, and therefore the infrared instrument front cover is more stable during subsequent polishing.

Description

Technical Field

[0001] The invention relates to the field of polishing, and in particular to a polishing device for processing a front cover of an infrared instrument. Background Art

[0002] Infrared instruments include infrared cameras, infrared spectrometers, infrared thermal imagers and other equipment. Infrared cameras are cameras specifically used to capture infrared radiation (electromagnetic radiation with a wavelength longer than that of visible light).

[0003] The front cover in an infrared camera usually refers to the filter or window in front of the infrared camera lens. These windows are usually specially designed to pass infrared radiation and usually need to be fully exposed to the environment when the camera is in use to ensure accurate capture of images or data within the infrared spectrum.

[0004] After the front cover of the infrared instrument is injection molded, some burrs will remain on the inner side of the front cover, which will affect the assembly of the front cover and the infrared camera lens. Therefore, before assembling the infrared camera, the inner side of the front cover of the infrared instrument needs to be polished. When polishing the inner side of the front cover of the infrared instrument, since the polishing position is on the inner side of the front cover, it is inconvenient to polish and the polishing efficiency is low. At the same time, the limiting of the front cover of the infrared instrument is not stable enough, which can easily cause the front cover to shake during polishing, thereby affecting the polishing quality of the front cover of the infrared instrument. Summary of the invention

[0005] In order to overcome the shortcomings that the infrared instrument front polishing device is inconvenient to polish the inner side of the infrared instrument front cover, the polishing efficiency is low, and the limiting of the front cover of the infrared instrument is not stable enough, which easily causes the front cover to shake during polishing, thereby affecting the polishing quality of the front cover of the infrared instrument, the present invention provides a polishing device for processing the infrared instrument front cover, which makes the infrared instrument front cover more stable during polishing, can polish the entire inner side of the infrared instrument front cover, and improves the polishing efficiency of the infrared instrument front cover.

[0006] The technical solution is as follows: A polishing device for processing an infrared instrument front cover, comprising a base, a support plate fixedly connected to the base, a servo motor fixedly connected to the support plate, a lifting mechanism provided on the support plate, an infrared instrument front cover placed on the lifting mechanism, the lifting mechanism being used to control the lifting of the infrared instrument front cover, a clamping mechanism provided on the lifting mechanism, the clamping mechanism being used to clamp the infrared instrument front cover, a close polishing mechanism provided on the lifting mechanism, the close polishing mechanism being used to polish the inner side of the infrared instrument front cover.

[0007] Preferably, the lifting mechanism includes a power shaft, the power shaft is fixedly connected to the output shaft of the servo motor, the lower part of the power shaft is fixedly connected to a power gear, a rotating round rod is rotatably connected to the support plate, a supporting disk is slidably connected to the rotating round rod, two guide plates are fixedly connected to the supporting disk, the two guide plates are symmetrically arranged, a fixing nut is fixedly connected to the side of the supporting disk close to the base, a reciprocating screw is rotatably connected to the support plate, the reciprocating screw is threadedly connected to the fixing nut, a fixed pinion is fixedly connected to the lower part of the reciprocating screw, the fixed pinion is meshed with the power gear, the fixed pinion is located outside the power gear, and an infrared instrument front cover is placed on the support disk.

[0008] Preferably, the clamping mechanism includes a fixed guide frame, the fixed guide frame is fixedly connected to the upper part of the base, the fixed guide frame has two oblique grooves, the support plate is fixedly connected to a fixed connecting plate at one end close to the fixed guide frame, the fixed connecting plate has two sliding grooves, the two sliding grooves of the fixed connecting plate are slidably connected to a sliding clamping frame, the two sliding grooves of the two sliding clamping frames are located in the two oblique grooves of the fixed guide frame at one end away from the front cover of the infrared instrument, the sliding clamping frames are slidably connected to an installation frame at one end close to the front cover of the infrared instrument, and rubber pads are installed on the two installation frames.

[0009] Preferably, the rubber pad is a soft rubber pad.

[0010] The driving mechanism is a movable frame, and the movable frame has a movable frame, and the movable frame has a movable frame.

[0011] Preferably, a clamping mechanism is also included, which is arranged on the guide plate, a moving bar is slidably connected to the guide plate, the end of the moving bar close to the front cover of the infrared instrument is fixedly connected to the mounting frame, a tension spring is connected between the moving bar and the guide plate, a clamping plate is slidably connected to the guide plate, two oblique grooves are formed on the clamping plate, fixed cylinders are fixedly connected on both sides of the moving bar, two oblique grooves are formed on the clamping plate, and the two fixed cylinders are located in the two oblique grooves formed on the two clamping plates.

[0012] Preferably, a sponge strip is further included, and the lower part of the pressing plate is fixedly connected with the sponge strip, and the sponge strip is used to press the upper surface of the front cover of the infrared instrument.

[0013] Compared with the prior art, the present invention has the following advantages: 1. The guide plate and the fixed connecting plate move upward, driving the sliding clamping frame, the mounting frame and the rubber pad to move upward together, and the support plate and the infrared instrument front cover are driven upward by the reciprocating screw, so that the infrared instrument front cover and the polishing wheel are at the same height, and the two sliding clamping frames move along the two inclined grooves on the fixed guide frame toward the direction close to the infrared instrument front cover, and the two rubber pads contact the two sides of the infrared instrument front cover, and the two sliding clamping frames continue to move along the two inclined grooves on the fixed guide frame toward the direction close to the infrared instrument front cover, and the rubber pads are compressed, and the rubber pads clamp the infrared instrument front cover, so that the subsequent infrared instrument front cover is more stable during polishing.

[0014] 2. The positive rotation of the internal gear drives the rotating round rod, lifting frame, moving support plate, power motor, polishing wheel, fixed moving rod and extrusion spring to rotate together. The lifting frame rotates along the ring groove of the fixed ring. The output shaft of the power motor drives the polishing wheel to rotate. The polishing wheel rotates and grinds the inner side of the front cover of the infrared instrument, so that the entire inner side of the front cover of the infrared instrument can be polished, thereby improving the polishing efficiency of the inner side of the front cover of the infrared instrument.

[0015] 3. The moving bar moves and squeezes the two oblique grooves of the clamping plate to move the clamping plate downward. The clamping plate presses the upper surface of the infrared instrument front cover, making the subsequent polishing of the inner side of the infrared instrument front cover more stable, thereby improving the polishing quality of the inner side of the infrared instrument front cover. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the first three-dimensional structure of the present invention.

[0017] Figure 2 It is a schematic diagram of the second three-dimensional structure of the present invention.

[0018] Figure 3 It is a schematic diagram of the third three-dimensional structure of the present invention.

[0019] Figure 4 It is a partial three-dimensional structural schematic diagram of the lifting mechanism, the clamping mechanism and the close polishing mechanism of the present invention.

[0020] Figure 5 For the present invention Figure 4 Schematic diagram of the enlarged three-dimensional structure of A in the middle.

[0021] Figure 6 It is a schematic diagram of the disassembled three-dimensional structure of the sliding clamping frame, the mounting frame and the rubber pad of the present invention.

[0022] Figure 7 It is a schematic diagram of the three-dimensional structure of the pressing plate and the sponge strip of the present invention.

[0023] Figure 8 It is a schematic diagram of the disassembled three-dimensional structure of the support plate, the fixing ring and the lifting frame of the present invention.

[0024] Explanation of the accompanying drawings: 1_base, 2_support plate, 3_servo motor, 41_power shaft, 42_power gear, 43_rotating round rod, 44_support plate, 441_guide plate, 45_fixing nut, 46_reciprocating screw, 47_fixed pinion, 5_front cover of infrared instrument, 61_fixed guide frame, 62_fixed connecting plate, 63_sliding clamping frame, 64_installing frame, 65_rubber pad, 71_arc rack, 72_internal gear, 73_moving support plate, 74_power motor, 75_polishing wheel, 76_fixing ring, 77_lifting frame, 78_fixed moving rod, 79_extrusion spring, 81_moving bar, 82_tension spring, 83_pressure plate, 84_fixed cylinder, 9_sponge bar. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings. It is hereby stated that the directional terms such as up, down, left, right, front, back, inside, outside, etc. that appear or will appear in the text of the present invention are only based on the accompanying drawings of the present invention, and are not specific limitations of the present invention.

[0026] Embodiment 1: A polishing device for processing an infrared instrument front cover, such as Figure 1-Figure 4 and Figure 8 As shown, it includes a base 1, a support plate 2 is welded on the base 1, a servo motor 3 is fixedly connected to the support plate 2, a lifting mechanism is provided on the support plate 2, an infrared instrument front cover 5 is placed on the lifting mechanism, the lifting mechanism is used to control the lifting of the infrared instrument front cover 5, the lifting mechanism is provided with a clamping mechanism, the clamping mechanism is used to clamp the infrared instrument front cover 5, the lifting mechanism is provided with a close polishing mechanism, the close polishing mechanism is used to polish the inner side of the infrared instrument front cover 5.

[0027] The lifting mechanism includes a power shaft 41, the power shaft 41 is fixedly connected to the output shaft of the servo motor 3, the lower part of the power shaft 41 is fixedly connected to a power gear 42, the support plate 2 is rotatably connected to a rotating round rod 43, the rotating round rod 43 is slidably connected to a support disk 44, two guide plates 441 are welded to the support disk 44, the two guide plates 441 are symmetrically arranged, a fixing nut 45 is welded to the side of the support disk 44 close to the base 1, a reciprocating screw 46 is rotatably connected to the support plate 2, the reciprocating screw 46 is threadedly connected to the fixing nut 45, the lower part of the reciprocating screw 46 is fixedly connected to a fixed pinion 47, the fixed pinion 47 is meshed with the power gear 42, the power gear 42 is used to transmit power to the fixed pinion 47 and the reciprocating screw 46, the fixed pinion 47 is located outside the power gear 42, and an infrared instrument front cover 5 is placed on the support disk 44.

[0028] The clamping mechanism includes a fixed guide frame 61, the fixed guide frame 61 is welded to the upper part of the base 1, the fixed guide frame 61 has two oblique grooves, the support plate 44 is welded to an end close to the fixed guide frame 61 with a fixed connecting plate 62, the fixed connecting plate 62 has two sliding grooves, the two sliding grooves of the fixed connecting plate 62 are slidably connected with a sliding clamping frame 63, the two sliding clamping frames 63 are located in the two oblique grooves of the fixed guide frame 61 at one end away from the infrared instrument front cover 5, the sliding clamping frames 63 are slidably connected to the ends of the infrared instrument front cover 5, and the two mounting frames 64 are installed with rubber pads 65, the rubber pads 65 are soft rubber pads, and the rubber pads 65 are used to clamp the infrared instrument front cover 5.

[0029] The close-fitting polishing mechanism includes an arc-shaped rack 71, the inner side of the power gear 42 is fixedly connected to the arc-shaped rack 71, the lower part of the rotating round rod 43 is fixedly connected to the inner gear 72, the upper part of the rotating round rod 43 is slidably connected to a movable support plate 73, both sides of the movable support plate 73 are provided with protrusions, the movable support plate 73 is fixedly connected to a power motor 74, the output shaft of the power motor 74 passes through the movable support plate 73, the output shaft of the power motor 74 is fixedly connected to a polishing wheel 75, the support plate 44 is fixedly connected to a fixing ring 76, and the fixing ring 76 An annular groove is provided on the inner side of the rotating round rod 43, a vertical groove is provided on the rotating round rod 43, a lifting frame 77 is slidably connected to the vertical groove of the rotating round rod 43, the bottom of the lifting frame 77 is stuck in the annular groove of the fixed ring 76, the upper side surface of the lifting frame 77 is in contact with the protrusions on both sides of the movable support plate 73, a fixed movable rod 78 is welded on the movable support plate 73, the lifting frame 77 is used to push the movable support plate 7 to move, the fixed movable rod 78 is slidably connected to the rotating round rod 43, and an extrusion spring 79 is connected between the rotating round rod 43 and the fixed movable rod 78.

[0030] When it is necessary to polish the inner side of the infrared instrument front cover 5, the worker places the infrared instrument front cover 5 on the support plate 44, and then starts the servo motor 3 and the power motor 74. The output shaft of the servo motor 3 rotates forward to drive the power shaft 41 and the power gear 42 to rotate forward. The power gear 42 rotates to drive the reciprocating screw 46 and the fixed pinion 47 to reverse. Under the guidance of the rotating round rod 43, the reciprocating screw 46 reverses to drive the fixed nut 45, the support plate 44, the guide plate 441, the infrared instrument front cover 5 and the fixed connecting plate 62 to move upward. The guide plate 441 and the fixed connecting plate 62 move upward to drive the sliding clamping frame 63, the mounting frame 64 and the rubber pad 65 to move upward together. The support plate 44 and the infrared instrument front cover 5 are driven upward by the reciprocating screw 46. The infrared instrument front cover 5 and the polishing wheel 75 are at the same height, and the two sliding clamping frames 63 move along the two oblique grooves on the fixed guide frame 61 toward the direction close to the infrared instrument front cover 5. The two rubber pads 65 contact the two sides of the infrared instrument front cover 5. The two sliding clamping frames 63 continue to move along the two oblique grooves on the fixed guide frame 61 toward the direction close to the infrared instrument front cover 5. The rubber pads 65 are compressed and clamp the infrared instrument front cover 5, so that the infrared instrument front cover 5 is more stable during subsequent grinding. The support plate 44 and the fixed ring 76 move upward to push the lifting frame 77 to move upward along the vertical groove of the rotating round rod 43, and the lifting frame 77 pushes the moving support plate 73, the power motor 74, the polishing wheel 75 and the fixed moving rod 78 The extrusion spring 79 is compressed, the polishing wheel 75 moves to press against the inner side of the infrared instrument front cover 5, the power shaft 41 drives the power gear 42 to continue to rotate forward, the power gear 42 is disengaged from the fixed pinion 47, the power gear 42 drives the arc rack 71 to mesh with the internal gear 72, the arc rack 71 drives the internal gear 72 to rotate forward, the positive rotation of the internal gear 72 drives the rotating round rod 43, the lifting frame 77, the moving support plate 73, the power motor 74, the polishing wheel 75, the fixed moving rod 78 and the extrusion spring 79 to rotate forward together, the lifting frame 77 rotates along the annular groove of the fixed ring 76, the output shaft of the power motor 74 drives the polishing wheel 75 to rotate, and the polishing wheel 75 rotates and polishes the inner side of the infrared instrument front cover 5, so that the entire inner side of the infrared instrument front cover 5 can be polished. The polishing is performed to improve the polishing efficiency of the inner side of the infrared instrument front cover 5, the power gear 42 continues to drive the arc rack 71 to rotate, the arc rack 71 is disengaged from the inner gear 72, the rotating round rod 43 and the inner gear 72 no longer rotate, the rotating round rod 43 no longer drives the movable support plate 73, the power motor 74 and the polishing wheel 75 to rotate, the polishing wheel 75 no longer rotates to polish the inner side of the infrared instrument front cover 5, when the inner side of the infrared instrument front cover 5 is polished, the staff turns off the power motor 74, the power motor 74 no longer drives the polishing wheel 75 to rotate, the output shaft of the servo motor 3 continues to drive the power gear 42 to rotate, the power gear 42 continues to mesh with the fixed pinion 47, the power gear 42 drives the fixed pinion 47 and the reciprocating screw 46 to continue to rotate,The reciprocating screw 46 drives the support plate 44, the fixed ring 76 and the fixed connecting plate 62 to reset downward, and the two sliding clamping frames 63 reset along the two inclined grooves of the fixed guide frame 61, and the rubber pad 65 is out of contact with the infrared instrument front cover 5. The rubber pad 65 no longer clamps the infrared instrument front cover 5, and the lifting frame 77 is driven to move downward along the vertical groove of the rotating round rod 43 through the annular groove of the fixed ring 76. The lifting frame 77 no longer squeezes the two protrusions of the movable support plate 73 and resets under the action of the squeezing spring 79. The movable support plate 73, the power motor 74, the polishing wheel 75 and the fixed movable rod 78 reset, and the polishing wheel 75 is out of contact with the inner side of the infrared instrument front cover 5. The reciprocating screw 46 continues to rotate to drive the support plate 44, the fixed ring 76 and the fixed connecting plate 62 to reset back to the initial position. The worker turns off the servo motor 3 and removes the polished infrared instrument front cover 5 from the support plate 44.

[0031] Embodiment 2: Based on embodiment 1, Figure 5-Figure 7 As shown, a clamping mechanism is also included, and the clamping mechanism is arranged on the guide plate 441. A moving bar 81 is slidably connected to the guide plate 441. The end of the moving bar 81 close to the front cover 5 of the infrared instrument is fixedly connected to the mounting frame 64. A tension spring is connected between the moving bar and the guide plate. A clamping plate 83 is slidably connected to the guide plate 441. The clamping plate 83 has two oblique grooves. Fixed cylinders 84 are fixedly connected on both sides of the moving bar 81. The clamping plate 83 has two oblique grooves. The two fixed cylinders 84 are located in the two oblique grooves on the two clamping plates 83.

[0032] When the outer side of the infrared instrument front cover 5 squeezes the rubber pad 65 and the mounting frame 64 and moves in the direction away from the infrared instrument front cover 5, the moving bar 81 is driven to move together, and the moving bar 81 pulls the tension spring 82, and the tension spring 82 is stretched. Under the limiting action of the clamping plate 83 and the guide plate 441, the moving bar 81 moves and squeezes the two oblique grooves of the clamping plate 83, so that the clamping plate 83 moves downward, and the clamping plate 83 presses the upper surface of the infrared instrument front cover 5, so that the subsequent polishing of the inner side of the infrared instrument front cover 5 is more stable, thereby improving the polishing quality of the inner side of the infrared instrument front cover 5. When the rubber pad 65 is out of contact with the infrared instrument front cover 5, the infrared instrument front cover 5 no longer squeezes the rubber pad 65 and the mounting frame 64. Under the action of the tension spring 82, the mounting frame 64 and the rubber pad 65 are reset. The reset of the rubber pad 65 pushes the clamping plate 83 to move upward, and the reset of the clamping plate 83 no longer presses the upper surface of the infrared instrument front cover 5.

[0033] Embodiment 3: Based on embodiment 2, Figure 7 As shown, a sponge strip 9 is also included. The lower part of the pressing plate 83 is fixedly connected with the sponge strip 9, and the sponge strip 9 is used to press the upper surface of the infrared instrument front cover 5.

[0034] The clamping plate 83 drives the sponge strip 9 to move downward together, and the sponge strip 9 contacts the upper surface of the infrared instrument front cover 5. The clamping plate 83 continues to drive the sponge strip 9 to move downward, and the sponge strip 9 is compressed, so that the clamping plate 83 is against the infrared instrument front cover 5 through the sponge strip 9.

[0035] The above description is only an example of the present invention and is not intended to limit the present invention. Any equivalent substitutions made within the principles of the present invention should be included in the protection scope of the present invention. The contents not elaborated in detail in the present invention belong to the existing technologies known to those skilled in the art.

Claims

1. A polishing device for processing an infrared instrument front cover, characterized in that: The invention comprises a base (1), a support plate (2) fixedly connected to the base (1), a servo motor (3) fixedly connected to the support plate (2), a lifting mechanism provided on the support plate (2), an infrared instrument front cover (5) placed on the lifting mechanism, the lifting mechanism being used to control the lifting of the infrared instrument front cover (5), a clamping mechanism provided on the lifting mechanism, the clamping mechanism being used to clamp the infrared instrument front cover (5), and a close-fitting polishing mechanism provided on the lifting mechanism, the close-fitting polishing mechanism being used to polish the inner side of the infrared instrument front cover (5).

2. The infrared instrument front cover polishing device according to claim 1, characterized in that: The lifting mechanism comprises a power shaft (41), the power shaft (41) is fixedly connected to the output shaft of the servo motor (3), the lower part of the power shaft (41) is fixedly connected to a power gear (42), the support plate (2) is rotatably connected to a rotating round rod (43), the rotating round rod (43) is slidably connected to a support disk (44), the support disk (44) is fixedly connected to two guide plates (441), the two guide plates (441) are symmetrically arranged, and the support disk (44) is close to the support disk (44). A fixing nut (45) is fixedly connected to one side of the base (1); a reciprocating screw (46) is rotatably connected to the support plate (2); the reciprocating screw (46) is threadedly connected to the fixing nut (45); a fixing pinion (47) is fixedly connected to the lower part of the reciprocating screw (46); the fixing pinion (47) is meshed with the power gear (42); the fixing pinion (47) is located outside the power gear (42); and an infrared instrument front cover (5) is placed on the support plate (44).

3. The infrared instrument front cover polishing device according to claim 2, characterized in that: The clamping mechanism comprises a fixed guide frame (61), the upper part of the base (1) is fixedly connected to the fixed guide frame (61), the fixed guide frame (61) is provided with two oblique grooves, the end of the support plate (44) close to the fixed guide frame (61) is fixedly connected to a fixed connecting plate (62), the fixed connecting plate (62) is provided with two sliding grooves, the two sliding grooves of the fixed connecting plate (62) are slidably connected to sliding clamping frames (63), the ends of the two sliding clamping frames (63) away from the infrared instrument front cover (5) are located in the two oblique grooves of the fixed guide frame (61), the ends of the sliding clamping frames (63) close to the infrared instrument front cover (5) are slidably connected to mounting frames (64), and rubber pads (65) are installed on the two mounting frames (64).

4. The infrared instrument front cover polishing device according to claim 3, characterized in that: The rubber pad (65) is a soft rubber pad.

5. The infrared instrument front cover polishing device according to claim 3, characterized in that: The close-fitting polishing mechanism comprises an arc-shaped rack (71), the inner side of the power gear (42) is fixedly connected with the arc-shaped rack (71), the lower part of the rotating round rod (43) is fixedly connected with the internal gear (72), the upper part of the rotating round rod (43) is slidably connected with a movable support plate (73), both sides of the movable support plate (73) are provided with protrusions, the movable support plate (73) is fixedly connected with a power motor (74), the output shaft of the power motor (74) passes through the movable support plate (73), the output shaft of the power motor (74) is fixedly connected with a polishing wheel (75), and the support plate (44) is fixedly connected with a fixing ring ( 76), a ring groove is formed on the inner side of the fixed ring (76), a vertical groove is formed on the rotating round rod (43), a lifting frame (77) is slidably connected to the vertical groove of the rotating round rod (43), the bottom of the lifting frame (77) is inserted into the ring groove of the fixed ring (76), the upper side surface of the lifting frame (77) contacts the protrusions on both sides of the movable support plate (73), a fixed movable rod (78) is fixedly connected to the movable support plate (73), the fixed movable rod (78) is slidably connected to the rotating round rod (43), and an extrusion spring (79) is connected between the rotating round rod (43) and the fixed movable rod (78).

6. The infrared instrument front cover polishing device according to claim 4, characterized in that: The invention also includes a clamping mechanism, which is arranged on the guide plate (441), and a moving bar (81) is slidably connected to the guide plate (441), and one end of the moving bar (81) close to the front cover (5) of the infrared instrument is fixedly connected to the mounting frame (64), and a tension spring is connected between the moving bar and the guide plate, and a clamping plate (83) is slidably connected to the guide plate (441), and two oblique grooves are formed on the clamping plate (83), and both sides of the moving bar (81) are fixedly connected to fixed cylinders (84), and two oblique grooves are formed on the clamping plate (83), and the two fixed cylinders (84) are located in the two oblique grooves formed on the two clamping plates (83).

7. The infrared instrument front cover polishing device according to claim 5, characterized in that: It also includes a sponge strip (9), the lower part of the pressing plate (83) is fixedly connected with the sponge strip (9), and the sponge strip (9) is used to press the upper surface of the infrared instrument front cover (5).

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