CN211309961U - Transfer chain article detecting system that drops - Google Patents

Abstract

The utility model relates to a conveyor line article drop detecting system, which comprises a frame and a base band arranged on the frame, wherein a cleaning device for cleaning the base band is arranged on the frame, the cleaning device comprises two chutes respectively arranged at two sides of the frame, two movable plates respectively connected with the two chutes along the vertical sliding direction and a driving mechanism arranged on the frame for driving the two movable plates to move along the vertical direction; the top of each movable plate is provided with a fixing mechanism for fixing the fixing rod; the roller is sleeved on the fixed rod and can rotate relative to the fixed rod, a plurality of bristles are fixedly connected to the outer side wall of the roller, and a limiting mechanism used for limiting the roller is mounted on the fixed rod. The utility model discloses a set up cleaning device, can reduce the possibility of the surface attachment of article goes up too many dusts.

Description

Transfer chain article detecting system that drops

Technical Field

The utility model belongs to the technical field of the commodity circulation technique and specifically relates to a transfer chain article detecting system that drops is related to.

Background

In the process of sorting articles in an automated logistics system, the accuracy of subsequent statistical measurement is often affected by loss or delay caused by dropping of the sorted articles. In particular in large-scale automated logistics systems, some conveying or sorting installations cannot be equipped with item fall protection devices due to external conditions or functional requirements, for example: conveyor side baffle etc. the condition that the transport article dropped inevitably can appear, receives the work place restriction moreover, and transfer chain structure is complicated, has a great deal of turn, turning or dead angle, and article size varies in addition, and whether single detection device can't guarantee article and drop, if the staff does not discover in time, will lead to article can not arrive the destination according to the time requirement, and then influence final quality of service.

In the prior art, reference can be made to a Chinese utility model patent with an authorization notice number of CN206451020U, which discloses a conveyor line article drop detection system, comprising an article sorting system, an article straight-way conveying system, an article curved-way conveying system, and a plurality of detection devices arranged in the article sorting system, the article straight-way conveying system and the article curved-way conveying system, wherein the detection devices are connected with a PLC control system, and the PLC control system is connected with an SCADA data acquisition and monitoring system; the detection device is one or more of a photoelectric detection device, a touch device and an image recognition detection device; the photoelectric detection device is a laser detection device or an infrared detection device, and the image recognition detection device is a dome camera, a gun-shaped camera and/or a patrol camera.

In the prior art, reference may be made to chinese patent application with publication number CN106914424A, which discloses a sorting system, including a conveying device, a sorting device, a position sensor, and a control system, where the conveying device includes a conveying belt and conveying power, the sorting device includes a sorting conveying belt, a jacking roller, a lifting power element, and a sorting conveying power element, a sorting opening is formed in a side edge of the sorting conveying belt, and the sorting conveying belt includes: the control system judges that the object to be sorted reaches the sorting position, controls the lifting power element to drive the lifting roller to ascend so as to be in contact friction with the balls, the balls roll to drive the object to be sorted to move to the sorting opening, and the axial direction of a ball mounting shaft is obliquely arranged relative to the width direction of the base band; the letter sorting system passes through lift power component jack-up jacking cylinder and the friction of letter sorting conveyer belt, and the friction drive jacking cylinder that carries forward of letter sorting conveyer belt rotates to drive the ball and rotate, ball installation axle slope sets up, treats on the drive letter sorting conveyer belt that the letter sorting thing moves to the side and sorts, need not complicated manipulator, and simple structure easily realizes that area is little.

The above prior art solutions have the following drawbacks: the base belt of the sorting conveyer belt is easy to be adhered with dust, so that the surface of an article is easy to be adhered with dust.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a transfer chain article detecting system that drops, it is through setting up cleaning device, can reduce the possibility of the surface attachment of article on too many dusts.

The above utility model discloses an above-mentioned utility model purpose can realize through following technical scheme:

a conveyor line article drop detection system comprises a rack and a base band arranged on the rack, wherein a cleaning device for cleaning the base band is arranged on the rack, and comprises two sliding chutes respectively arranged on two sides of the rack, two movable plates respectively connected to the two sliding chutes in a sliding manner along the vertical direction and a driving mechanism arranged on the rack and used for driving the two movable plates to move along the vertical direction; the top of each movable plate is provided with a fixing mechanism for fixing the fixing rod; the roller is sleeved on the fixed rod and can rotate relative to the fixed rod, a plurality of bristles are fixedly connected to the outer side wall of the roller, and a limiting mechanism used for limiting the roller is mounted on the fixed rod.

By adopting the technical scheme, the bristles are arranged, so that dust on the base belt can be removed conveniently, and the possibility that too much dust is attached to the surface of an article can be reduced; the driving mechanism is arranged, so that the movable plate can be conveniently driven to move upwards, the movable plate moves upwards to drive the fixed rod to move upwards, the fixed rod moves upwards to drive the roller to move upwards, and the roller moves upwards to drive the bristles to move upwards, so that the bristles are more tightly attached to the base band, and the surface of the base band can be conveniently cleaned; through setting up fixed establishment, be convenient for carry out the dismouting to the dead lever to be convenient for clear up the brush hair.

The present invention may be further configured in a preferred embodiment as: limiting mechanism establishes the limiting plate that is fixed in dead lever one end including the cover, offers the dead lever and keeps away from the groove of stepping down of limiting plate one end terminal surface, installs and carries out spacing subassembly and install the multiunit reset assembly in the inslot of stepping down in the inslot that is used for keeping away from the limiting plate to the cylinder.

By adopting the technical scheme, the fixed rod is inserted into the roller, and the limiting plate is contacted with one end of the roller, so that one end of the roller can be limited, and then the other end of the roller is limited by the limiting assembly, so that the possibility of the roller shifting along the axial direction of the fixed rod can be reduced; through setting up stop gear, be convenient for carry out the dismouting to the cylinder, therefore be convenient for clear up the brush hair.

The present invention may be further configured in a preferred embodiment as: the limiting component comprises a vertical plate fixedly connected to the opening of the abdicating groove, a screw rotatably connected to the vertical plate, a first inclined block in threaded connection with the screw and a plurality of second inclined blocks connected to the side wall of the abdicating groove in a sliding manner along the radial direction of the fixing rod; the one end that first sloping block was kept away from to the second sloping block runs through the lateral wall setting of dead lever, and one side that the second sloping block is close to the cylinder can be laminated in the cylinder and keep away from the one end terminal surface of limiting plate, every be provided with the cooperation subassembly that is used for driving the second sloping block and removes between second sloping block and the first sloping block, the inslot of stepping down installs the direction subassembly that is used for leading to first sloping block, the multiunit the installation in a plurality of second sloping blocks of reset assembly difference one-to-one.

By adopting the technical scheme, when the roller needs to be limited, the screw rod is rotated to drive the first inclined block to move, and at the moment, the first inclined block drives the second inclined block to move under the action of the matching component, so that the roller can be limited; through setting up spacing subassembly, be convenient for carry on spacingly to the cylinder.

The present invention may be further configured in a preferred embodiment as: the matching assembly comprises two inclined planes which are respectively arranged on the opposite inner sides of the first inclined block and the second inclined block, and the two inclined planes are matched.

Through adopting above-mentioned technical scheme, through setting up the inclined plane, the first sloping block drive second sloping block of being convenient for removes.

The present invention may be further configured in a preferred embodiment as: the guide assembly comprises a sleeve fixedly connected to one end, far away from the vertical plate, of the abdicating groove and a guide rod connected to the inner cavity of the sleeve in a sliding manner along the axial direction of the fixing rod; one end of the guide rod, which is far away from the sleeve, is fixedly connected with the first inclined block.

Through adopting above-mentioned technical scheme, the sleeve has the guide effect to the guide arm to can reduce the possibility that first sloping block takes place to deviate at the axial of following the dead lever in-process that slides.

The present invention may be further configured in a preferred embodiment as: each group of reset components comprises a reset block vertically and fixedly connected to one side of the second inclined block and a reset spring fixedly connected to one side of the reset block, which is far away from the first inclined block; one end of the reset spring, which is far away from the reset block, is fixedly connected with the inner side wall of the abdicating groove.

By adopting the technical scheme, the second inclined block moves towards the outside of the fixed rod to drive the reset block to move, the reset block moves to press the reset spring, and the reset spring is in a compressed state at the moment; when the first inclined block is far away from the second inclined block to move, the reset block pushes the second inclined block to reset under the action of the reset spring, and therefore the labor intensity of operators can be reduced.

The present invention may be further configured in a preferred embodiment as: the fixing mechanism comprises a fixing plate fixedly connected to one end of the top of the movable plate, a butt plate connected to the top of the movable plate in a sliding manner along the length direction of the movable plate, a mounting plate fixedly connected to the other end of the top of the movable plate, and a first lead screw in threaded connection with the mounting plate; one end of the first lead screw is fixedly connected with a first hand wheel, and the other end of the first lead screw is rotatably connected to one side, close to the mounting plate, of the abutting plate; the bottom rigid coupling of butt joint board has the dovetail block, the dovetail groove that is used for supplying the dovetail block to slide along the length direction of fly leaf is seted up at the top of fly leaf.

By adopting the technical scheme, the fixed rod is positioned between the abutting plate and the fixed plate, then the first lead screw is rotated by rotating the first hand wheel, and the abutting plate is driven by the rotation of the first lead screw to move towards the direction close to the fixed rod, so that the fixed rod can be fixed; through setting up fixed establishment, be convenient for fix the dead lever.

The present invention may be further configured in a preferred embodiment as: the driving mechanism comprises two second lead screws which are respectively and rotatably connected in the two sliding grooves and a driving assembly which is arranged on the rack and is used for driving the two second lead screws to rotate; the two movable plates are respectively in threaded connection with the two second lead screws, and the driving assembly comprises a horizontal shaft which is horizontally and rotatably connected to the rack and a second hand wheel which is fixedly connected to one end of the horizontal shaft; the outer side walls of two ends of the horizontal shaft are fixedly connected with worms respectively, the outer side walls of the two second lead screws are fixedly sleeved with worm wheels, and the two worms are meshed with the two worm wheels respectively.

By adopting the technical scheme, the horizontal shaft is rotated by rotating the second hand wheel, the horizontal shaft drives the two worms to rotate, the two worms drive the two worm wheels to rotate, the two worm wheels drive the two second lead screws to rotate, and the two second lead screws drive the two movable plates to move vertically; through setting up actuating mechanism, be convenient for drive two fly leafs along vertical removal.

To sum up, the utility model discloses a following at least one useful technological effect:

1. through the arrangement of the bristles, dust on the base belt is convenient to remove, so that the possibility that too much dust is attached to the surface of an article can be reduced; the driving mechanism is arranged, so that the movable plate can be conveniently driven to move upwards, the movable plate moves upwards to drive the fixed rod to move upwards, the fixed rod moves upwards to drive the roller to move upwards, and the roller moves upwards to drive the bristles to move upwards, so that the bristles are more tightly attached to the base band, and the surface of the base band can be conveniently cleaned; the fixing mechanism is arranged, so that the fixing rod is convenient to disassemble and assemble, and the bristles are convenient to clean;

2. the fixing rod is inserted into the roller, the limiting plate is in contact with one end of the roller, so that one end of the roller can be limited, and then the other end of the roller is limited through the limiting assembly, so that the possibility that the roller deviates along the axial direction of the fixing rod can be reduced; the limiting mechanism is arranged, so that the roller is convenient to disassemble and assemble, and bristles are convenient to clean;

3. the horizontal shaft is rotated by rotating the second hand wheel, the horizontal shaft drives the two worms to rotate, the two worms rotate to drive the two worm wheels to rotate, the two worm wheels rotate to drive the two second lead screws to rotate, and the two second lead screws rotate to drive the two movable plates to move vertically; through setting up actuating mechanism, be convenient for drive two fly leafs along vertical removal.

Drawings

FIG. 1 is a schematic view of the overall structure of the embodiment;

FIG. 2 is a schematic view showing the structure of the cleaning device in the embodiment;

FIG. 3 is a partial cross-sectional view of an embodiment of a highlighted stop mechanism;

FIG. 4 is an enlarged view of a portion of FIG. 3 at A;

FIG. 5 is a schematic view showing the structure of the highlighting fixing mechanism in the embodiment.

In the figure, 1, a frame; 11. a baseband; 2. a cleaning device; 21. a chute; 22. a movable plate; 221. a dovetail groove; 23. fixing the rod; 24. a drum; 25. brushing; 3. a limiting mechanism; 31. a limiting plate; 32. a yielding groove; 33. a limiting component; 331. a vertical plate; 332. a screw; 333. a first swash block; 334. a second swash block; 34. a mating component; 341. a bevel; 35. a guide assembly; 351. a sleeve; 352. a guide bar; 36. a reset assembly; 361. a reset block; 362. a return spring; 4. a fixing mechanism; 41. a fixing plate; 42. a butt joint plate; 421. a dovetail block; 43. mounting a plate; 44. a first lead screw; 45. a first hand wheel; 5. a drive mechanism; 51. a second lead screw; 52. a drive assembly; 521. a horizontal axis; 522. a second hand wheel; 523. a worm; 524. a worm gear.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings.

As shown in fig. 1, for the utility model discloses a transfer chain article detecting system that drops, including frame 1 and install baseband 11 in frame 1, install the cleaning device 2 that is used for clearing up baseband 11 in frame 1.

As shown in fig. 2 and fig. 3, the cleaning device 2 includes two sliding slots 21 respectively opened at two sides of the frame 1, two movable plates 22 respectively connected to the two sliding slots 21 in a vertically sliding manner, and a driving mechanism 5 mounted on the frame 1 for driving the two movable plates 22 to move vertically; the top of the two movable plates 22 is provided with a fixed rod 23, and the top of each movable plate 22 is provided with a fixing mechanism 4 for fixing the fixed rod 23; the fixing rod 23 is sleeved with a roller 24, the roller 24 can rotate relative to the fixing rod 23, the outer side wall of the roller 24 is fixedly connected with a plurality of bristles 25, and the fixing rod 23 is provided with a limiting mechanism 3 for limiting the roller 24.

As shown in fig. 3 and 4, the limiting mechanism 3 includes a limiting plate 31 fixed at one end of the fixing rod 23, a yielding groove 32 provided at an end surface of the fixing rod 23 far away from the limiting plate 31, a limiting component 33 installed in the yielding groove 32 for limiting an end of the roller 24 far away from the limiting plate 31, and a plurality of sets of reset components 36 installed in the yielding groove 32. The fixing rod 23 is inserted into the roller 24, the limit plate 31 is in contact with one end of the roller 24, so that one end of the roller 24 can be limited, and then the other end of the roller 24 is limited through the limit assembly 33, so that the possibility that the roller 24 deviates along the axial direction of the fixing rod 23 can be reduced; through setting up stop gear 3, be convenient for carry out the dismouting to cylinder 24, therefore be convenient for clear up brush hair 25.

The limiting component 33 comprises a vertical plate 331 fixedly connected to the opening of the abdicating groove 32, a screw rod 332 rotatably connected to the vertical plate 331 through a bearing, a first inclined block 333 in threaded connection with the screw rod 332, and a plurality of second inclined blocks 334 slidably connected to the side wall of the abdicating groove 32 along the radial direction of the fixing rod 23; one end of the second inclined block 334, which is far away from the first inclined block 333, penetrates through the outer side wall of the fixed rod 23, one side of the second inclined block 334, which is close to the roller 24, can be attached to the end face, which is far away from the limit plate 31, of the roller 24, a matching assembly 34 for driving the second inclined block 334 to move is arranged between each second inclined block 334 and the first inclined block 333, the matching assembly 34 comprises two inclined surfaces 341 which are respectively arranged on the opposite inner sides of the first inclined block 333 and the second inclined block 334, and the two inclined surfaces 341 are matched; a guide component 35 for guiding the first inclined block 333 is installed in the abdicating groove 32, the guide component 35 comprises a sleeve 351 fixedly connected to one end of the abdicating groove 32 far away from the vertical plate 331 and a guide rod 352 connected to the inner cavity of the sleeve 351 in a sliding manner along the axial direction of the fixing rod 23; one end of the guide rod 352 far away from the sleeve 351 is fixedly connected to the first inclined block 333; the multiple sets of reset components 36 are respectively mounted on the multiple second inclined blocks 334 in a one-to-one correspondence. When the roller 24 needs to be limited, the screw 332 is rotated to drive the first inclined block 333 to move, and at the moment, the first inclined block 333 drives the second inclined block 334 to move under the action of the inclined surface 341, so that the roller 24 can be limited; through setting up spacing subassembly 33, be convenient for carry on spacingly to cylinder 24.

Each group of reset components 36 comprises a reset block 361 vertically fixed on one side of the second inclined block 334 and a reset spring 362 fixed on one side of the reset block 361 far away from the first inclined block 333; one end of the return spring 362 away from the return block 361 is fixed to the inner side wall of the relief groove 32. The second inclined block 334 moves towards the outside of the fixed rod 23 to drive the reset block 361 to move, the reset block 361 moves to press the reset spring 362, and the reset spring 362 is in a compressed state at the moment; when the first inclined block 333 moves away from the second inclined block 334, the reset block 361 pushes the second inclined block 334 to reset under the action of the reset spring 362, so that the labor intensity of operators can be reduced.

As shown in fig. 2 and 5, the fixing mechanism 4 includes a fixing plate 41 fixed to one end of the top of the movable plate 22, an abutting plate 42 slidably connected to the top of the movable plate 22 along the length direction of the movable plate 22, a mounting plate 43 fixed to the other end of the top of the movable plate 22, and a first lead screw 44 screwed to the mounting plate 43; one end of the first lead screw 44 is fixedly connected with a first hand wheel 45, and the other end is rotatably connected to one side of the abutting plate 42 close to the mounting plate 43 through a bearing; the bottom of the abutting plate 42 is fixedly connected with a dovetail block 421, and the top of the movable plate 22 is provided with a dovetail groove 221 for the dovetail block 421 to slide along the length direction of the movable plate 22. The fixed rod 23 is positioned between the abutting plate 42 and the fixed plate 41, then the first lead screw 44 is rotated by rotating the first hand wheel 45, the first lead screw 44 rotates and drives the abutting plate 42 to move towards the direction close to the fixed rod 23, and therefore the fixed rod 23 can be fixed; by providing the fixing mechanism 4, it is convenient to fix the fixing rod 23.

The driving mechanism 5 comprises two second lead screws 51 which are respectively connected in the two sliding grooves 21 in a rotating manner through bearings, and a driving assembly 52 which is arranged on the machine frame 1 and is used for driving the two second lead screws 51 to rotate; the two movable plates 22 are respectively connected to the two second lead screws 51 in a threaded manner, and the driving assembly 52 includes a horizontal shaft 521 horizontally and rotatably connected to the frame 1 through a bearing and a second wheel 522 fixedly connected to one end of the horizontal shaft 521; the outer side walls of two ends of the horizontal shaft 521 are respectively and fixedly connected with a worm 523, the outer side walls of the two second lead screws 51 are respectively and fixedly sleeved with a worm wheel 524, and the two worms 523 are respectively meshed with the two worm wheels 524. The horizontal shaft 521 is rotated by rotating the second hand wheel 522 to drive the two worms 523 to rotate, the two worms 523 are rotated to drive the two worm wheels 524 to rotate, the two worm wheels 524 are rotated to drive the two second lead screws 51 to rotate, and the two second lead screws 51 are rotated to drive the two movable plates 22 to move vertically; by providing the driving mechanism 5, it is convenient to drive the two movable plates 22 to move vertically.

The implementation principle of the embodiment is as follows:

by arranging the brush bristles 25, dust on the base belt 11 is removed conveniently, so that the possibility that too much dust is attached to the surface of an object can be reduced; the horizontal shaft 521 is rotated by rotating the second hand wheel 522, the horizontal shaft 521 is rotated to drive the two worms 523 to rotate, the two worms 523 are rotated to drive the two worm wheels 524 to rotate, the two worm wheels 524 are rotated to drive the two second lead screws 51 to rotate, the two second lead screws 51 are rotated to drive the two movable plates 22 to vertically move, the two movable plates 22 move upwards to drive the fixed rod 23 to move upwards, the fixed rod 23 moves upwards to drive the roller 24 to move upwards, and the roller 24 moves upwards to drive the bristles 25 to move upwards, so that the bristles 25 are attached to the base band 11 more tightly, and the surface of the base band 11 is cleaned conveniently; through setting up fixed establishment 4, be convenient for carry out the dismouting to dead lever 23 to be convenient for clear up brush hair 25.

The embodiment of this specific implementation mode is the preferred embodiment of the present invention, not limit according to this the utility model discloses a protection scope, so: all equivalent changes made according to the structure, shape and principle of the utility model are covered within the protection scope of the utility model.

Claims (8)

1. The utility model provides a transfer chain article detecting system that drops, includes frame (1) and installs baseband (11) on frame (1), its characterized in that: the cleaning device (2) for cleaning the base belt (11) is mounted on the rack (1), and the cleaning device (2) comprises two sliding chutes (21) which are respectively arranged on two sides of the rack (1), two movable plates (22) which are respectively connected to the two sliding chutes (21) in a sliding manner along the vertical direction, and a driving mechanism (5) which is mounted on the rack (1) and used for driving the two movable plates (22) to move along the vertical direction; the top parts of the two movable plates (22) are provided with fixed rods (23), and the top part of each movable plate (22) is provided with a fixing mechanism (4) for fixing the fixed rods (23); the fixing rod (23) is sleeved with a roller (24), the roller (24) can rotate relative to the fixing rod (23), the outer side wall of the roller (24) is fixedly connected with a plurality of bristles (25), and the fixing rod (23) is provided with a limiting mechanism (3) used for limiting the roller (24).

2. The conveyor line item drop detection system of claim 1, wherein: limiting mechanism (3) including the cover establish be fixed in limiting plate (31) of dead lever (23) one end, set up in dead lever (23) keep away from groove (32) of stepping down of limiting plate (31) one end terminal surface, install and be used for keeping away from the one end of limiting plate (31) to cylinder (24) in groove (32) of stepping down and carry out spacing subassembly (33) and install multiunit reset assembly (36) in groove (32) of stepping down.

3. The conveyor line article drop detection system of claim 2, wherein: the limiting component (33) comprises a vertical plate (331) fixedly connected to an opening of the abdicating groove (32), a screw rod (332) rotatably connected to the vertical plate (331), a first inclined block (333) in threaded connection with the screw rod (332), and a plurality of second inclined blocks (334) connected to the side wall of the abdicating groove (32) in a sliding manner along the radial direction of the fixing rod (23); one end that first sloping piece (333) was kept away from in second sloping piece (334) runs through the lateral wall setting of dead lever (23), and one side that second sloping piece (334) are close to cylinder (24) can laminate in cylinder (24) keep away from the one end terminal surface of limiting plate (31), every be provided with between second sloping piece (334) and first sloping piece (333) and be used for driving cooperation subassembly (34) that second sloping piece (334) removed, install guide assembly (35) that are used for leading to first sloping piece (333) in the groove of stepping down (32), the multiunit installation in a plurality of second sloping pieces (334) of resetting subassembly (36) one-to-one respectively.

4. The conveyor line article drop detection system of claim 3, wherein: the matching component (34) comprises two inclined surfaces (341) which are respectively arranged on the opposite inner sides of the first inclined block (333) and the second inclined block (334), and the two inclined surfaces (341) are matched.

5. The conveyor line item drop detection system of claim 4, wherein: the guide assembly (35) comprises a sleeve (351) fixedly connected to one end, far away from the vertical plate (331), of the abdicating groove (32) and a guide rod (352) connected to the inner cavity of the sleeve (351) in a sliding manner along the axial direction of the fixing rod (23); one end of the guide rod (352) far away from the sleeve (351) is fixedly connected with the first inclined block (333).

6. The conveyor line article drop detection system of claim 5, wherein: each group of reset components (36) comprises a reset block (361) vertically and fixedly connected to one side of the second inclined block (334) and a reset spring (362) fixedly connected to one side, far away from the first inclined block (333), of the reset block (361); one end of the return spring (362) far away from the return block (361) is fixedly connected with the inner side wall of the abdicating groove (32).

7. The conveyor line item drop detection system of claim 1, wherein: the fixing mechanism (4) comprises a fixing plate (41) fixedly connected to one end of the top of the movable plate (22), a butt plate (42) connected to the top of the movable plate (22) in a sliding manner along the length direction of the movable plate (22), a mounting plate (43) fixedly connected to the other end of the top of the movable plate (22), and a first lead screw (44) connected to the mounting plate (43) in a threaded manner; one end of the first lead screw (44) is fixedly connected with a first hand wheel (45), and the other end of the first lead screw is rotatably connected to one side, close to the mounting plate (43), of the abutting plate (42); the bottom of butt joint board (42) is rigid coupling has dovetail block (421), dovetail groove (221) that is used for supplying dovetail block (421) to slide along the length direction of fly leaf (22) are seted up to the top of fly leaf (22).

8. The conveyor line item drop detection system of claim 1, wherein: the driving mechanism (5) comprises two second lead screws (51) which are respectively connected in the two sliding grooves (21) in a rotating manner and a driving assembly (52) which is arranged on the rack (1) and is used for driving the two second lead screws (51) to rotate; the two movable plates (22) are respectively in threaded connection with two second lead screws (51), and the driving assembly (52) comprises a horizontal shaft (521) which is horizontally and rotatably connected to the rack (1) and a second hand wheel (522) which is fixedly connected to one end of the horizontal shaft (521); the outer side walls of two ends of the horizontal shaft (521) are fixedly connected with worms (523) respectively, the outer side walls of the two second lead screws (51) are fixedly sleeved with worm wheels (524), and the two worms (523) are meshed with the two worm wheels (524) respectively.

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