CN216369025U

CN216369025U - Weight detection device for automatic nut packaging system

Info

Publication number: CN216369025U
Application number: CN202122560899.0U
Authority: CN
Inventors: 张诚松; 李银川; 伍晋林; 周琳
Original assignee: Wuhan Tianze Food Technology Co ltd
Current assignee: Wuhan Tianze Food Technology Co ltd
Priority date: 2021-10-25
Filing date: 2021-10-25
Publication date: 2022-04-26
Anticipated expiration: 2031-10-25

Abstract

The utility model relates to a weight detection device for automatic packaging system of nut, relate to the field of nut processing equipment, which comprises a frame, be equipped with the transfer chain of weighing and letter sorting transfer chain in the frame in proper order, the transfer chain of weighing is provided with two side by side, two are weighed and all are equipped with weighing device on the transfer chain, and the transmission end of two transfer chains of weighing all docks with the feed end of letter sorting transfer chain, the discharge end of letter sorting transfer chain slides and is provided with the separation box, and the direction of sliding is mutually perpendicular with the direction of delivery of letter sorting transfer chain, the feed inlet that is suitable for nut bag to get into is offered to one side of separation box orientation transfer chain of weighing, be equipped with drive assembly in the frame, drive assembly is suitable for the drive separation box and slides. This application has the effect that improves nut bag's weight detection efficiency.

Description

Weight detection device for automatic nut packaging system

Technical Field

The application relates to the field of nut processing equipment, in particular to a weight detection device for an automatic nut packaging system.

Background

The automatic nut packaging system is a production line for automatically packaging nuts in bags; the nut is at the in-process of branch packing income nut bag, and the actual weight when packing into the bag for the prevention nut is inconsistent with required nut packing weight to the unqualified phenomenon of product appears, the nut generally need carry out weight detection through weight detection device after packing into the bag, with sorting out the rejection to the unqualified nut bag of weight.

The Chinese patent document with the publication number of CN213194646U discloses an automatic sorting device for food weight, which has the technical scheme that the automatic sorting device for food weight comprises a rack, wherein a feeding conveying line, a weighing conveying line and a sorting conveying line are arranged on the rack, a weighing device for carrying out weight detection on food is arranged on the weighing conveying line, a screening device is arranged on the sorting conveying line, the screening device comprises a rotating rod and a screening plate, the rotating rod is rotatably arranged on the rack, the screening plate is fixedly connected with the rotating rod, and the screening plate is positioned above the sorting conveying line; during the use, nut bag gets into the transfer chain of weighing from the feeding transfer chain, and the weighing device weighs the nut bag this moment, and when nut bag's weight was qualified, nut bag was smooth along the transfer chain of weighing and the transmission of letter sorting transfer chain, and when nut bag's weight was unqualified, the dwang rotated and drives the screening board and rotate, made the screening scraper blade reject out the letter sorting transfer chain with unqualified nut bag.

With respect to the related art among the above, the inventors consider that the following drawbacks exist: in order to ensure the detection precision of the nut bags, a plurality of nut bags need to be conveyed to a weighing conveying line one by one, so that the weighing device can detect the weight of one nut bag at a time; when the staff need improve the detection speed of nut bag, because the detection mode that weighing device detected the nut bag one by one has restricted the conveying speed of nut bag, make the detection efficiency of nut bag weight not high.

SUMMERY OF THE UTILITY MODEL

In order to improve the weight detection efficiency of nut bag, this application provides a weight detection device for automatic packaging system of nut.

The application provides a weight detection device for automatic packaging system of nut adopts following technical scheme:

the utility model provides a weight detection device for automatic packaging system of nut, which comprises a frame, be equipped with the transfer chain of weighing and letter sorting transfer chain in the frame in proper order, the transfer chain of weighing is provided with two, two side by side all be equipped with weighing device on the transfer chain of weighing, and two the transmission end of transfer chain of weighing all with the feed end of letter sorting transfer chain docks mutually, the discharge end of letter sorting transfer chain slides and is provided with the separation box, and the direction of sliding with the direction of delivery of letter sorting transfer chain is mutually perpendicular, the separation box orientation one side of the transfer chain of weighing is seted up and is adapted to the feed inlet that nut bag got into, be equipped with drive assembly in the frame, drive assembly is suitable for the drive the separation box slides.

By adopting the technical scheme, the two weighing conveying lines convey the nut bags side by side, so that the nut automatic packaging system can simultaneously detect and sort the weight of the two nut bags, and the weight detection efficiency of the nut bags is obviously improved; when one nut bag of the two nut bags is detected to be unqualified in weight, the driving assembly drives the sorting box to slide, so that the sorting box slides to one side of the nut bag with unqualified weight on the sorting conveying line, a feed port on the sorting box is aligned with the discharge end part of the sorting conveying line, the nut bag with unqualified weight slides along the feed port and enters the sorting box, and the nut bag with qualified weight smoothly slides out of the sorting conveying line and enters the next step; when two nut bags all detected weight nonconforming, drive assembly drive sorting box slided to the middle part of letter sorting transfer chain, and the feed inlet on the sorting box was just to the discharge end of letter sorting transfer chain this moment to make in two nut bags all got into the sorting box, thereby realized the quick automatic sorting of sorting box to two nut bags, ensured the qualification nature of the product of nut automated packaging system output.

Optionally, the driving assembly comprises a lead screw, a guide rod and a driving motor, the lead screw is horizontally arranged and rotatably connected to the rack, the lead screw stretches across the upper part of the sorting conveying line, the sorting box is assembled on the lead screw in a threaded manner, the driving motor is fixedly arranged on the rack, the output end of the driving motor is fixedly connected with one end of the lead screw in a coaxial manner, the driving motor is suitable for driving the lead screw to rotate, the guide rod is fixedly arranged on the rack, the length direction of the guide rod is consistent with the length direction of the lead screw, and the sorting box is slidably sleeved on the guide rod.

By adopting the technical scheme, the screw rod is driven to rotate by the driving motor, the rotating screw rod drives the sorting box to directionally slide along the length direction of the screw rod, so that the sorting box can quickly slide to a designated area and collect nut bags with unqualified weights, and the automatic sorting of the nut bags by the sorting box is realized; the guide bar is used with the lead screw cooperation, makes the sorting box carry out the steady slip along the length direction of lead screw to the letter sorting stability of sorting box has been ensured.

Optionally, a blanking assembly is arranged on the sorting box and is suitable for guiding out the nut bags in the sorting box.

By adopting the technical scheme, when a certain number of nut bags with unqualified weight in the sorting box are collected, the driving assembly drives the sorting box to slide, so that the sorting box slides away from the discharge end of the sorting conveying line, and the nut bags in the sorting box are guided out through the blanking assembly, so that the sorting box can be repeatedly used for sorting nut bags on the sorting conveying line, and the service performance of the sorting box is improved; the nut bags in the sorting box are automatically guided out through the blanking assembly, so that workers do not need to manually collect and process the nut bags in the sorting box, the operation burden of the workers is reduced, and the operation experience of the workers is improved.

Optionally, the unloading subassembly includes push pedal and electric putter, the push pedal is vertical to be laid and slidable mounting in the separation box, the length of push pedal lay the direction with the length of separation box lays the direction unanimous, just the bottom of push pedal slide laminate in on the interior diapire of separation box, electric putter locates the outside of separation box, electric putter's output runs through the separation box and with push pedal looks rigid coupling, electric putter is suitable for the drive the push pedal carries out reciprocating sliding along nut bag's direction of delivery.

By adopting the technical scheme, when the sorting box carries out sorting work of nut bags on the sorting conveying line, the output end of the electric push rod is in a contraction state, and the push plate is far away from the feeding hole of the sorting box, so that the sorting box can conveniently collect and store nut bags with unqualified weight; when unqualified nut bag of weight in the sorting box that needs discharge, electric putter's output stretches out to make the push pedal slide along the direction towards the feed inlet, make the push pedal release the sorting box with unqualified nut bag of weight in the sorting box from feed inlet department, thereby realized the quick derivation of unqualified nut bag of weight in the sorting box.

Optionally, the unloading subassembly includes bearing board, dwang and servo motor, the feed opening has been seted up to the lower terminal surface of separation box, the dwang level lay and rotate install in the feed opening, the one end of dwang is worn out the separation box, the bearing board set firmly in on the dwang, the up end of bearing board with the interior diapire activity parallel and level of separation box, servo motor set firmly in the separation box is kept away from one side of feed inlet, servo motor's output with the dwang is worn out the one end looks rigid coupling of separation box, servo motor is suitable for the drive the dwang rotates.

By adopting the technical scheme, when the sorting box carries out sorting work of nut bags on the sorting conveying line, the output end of the servo motor keeps in a static state, and at the moment, the upper end surface of the bearing plate is kept flush with the inner bottom wall of the sorting box, so that the bearing plate blocks a feed opening on the sorting box, and the sorting box is convenient to collect and store unqualified nut bags; when unqualified nut bags in the sorting box need to be discharged, the servo motor drives the rotating rod to rotate, and the rotating rod drives the bearing plate to rotate, so that the bearing plate opens the feed opening, and the bearing plate is in an inclined state at the moment, so that the unqualified nut bags quickly slide out of the feed opening along the upper surface of the bearing plate, and the automatic leading-out of the unqualified nut bags is realized; after the unqualified nut bags in the sorting box slide out, the output end of the servo motor rotates reversely, so that the bearing plate returns to the original position, and the sorting work of the nut bags is carried out by the sorting box again conveniently.

Optionally, defective product boxes are arranged on two sides of the sorting conveying line, a collecting opening is formed in the upper end face of each defective product box, and when the sorting boxes slide to one end of the guide rod, the sorting boxes are located right above the collecting opening of one defective product box.

By adopting the technical scheme, the two defective product boxes are symmetrically arranged at the two ends of the sorting conveying line, so that when the sorting boxes need to lead out the nut bags with unqualified weight, the sorting boxes can slide to the upper part of the adjacent defective product boxes nearby, and the unqualified nut bags are led into the defective product boxes along the collecting ports, so that the lead-out efficiency of the nut bags in the sorting boxes is improved, and the sorting boxes can be conveniently and quickly used for sorting the nut bags on the sorting conveying line; the defective product box is arranged, so that workers can conveniently collect the nut bags with unqualified weights.

Optionally, limit switches are arranged at two ends of the guide rod, a controller is arranged on the rack, the controller is electrically connected with the two limit switches, the controller is electrically connected with the electric push rod or the servo motor, and when the sorting box abuts against one limit switch, the sorting box is located right above one defective product box.

Through adopting above-mentioned technical scheme, when the nut bag in the separation box need discharge, driving motor drive lead screw rotates, thereby make the separation box slide to the one end of guide bar, and make separation box and limit switch carry out the activity butt, limit switch spreads the signal towards the controller this moment, make controller control driving motor stop work, make controller control electric putter or servo motor begin work, thereby make the interior substandard product incasement of the leading-in below of nut bag fast of separation box, realize the derivation work of nut bag in the separation box fast, easy operation and degree of automation are high.

Optionally, the rack is provided with two guide plates, the two guide plates are located between the sorting box and the weighing conveying line, the two guide plates are located above the sorting conveying line, the two guide plates are symmetrically arranged on two sides of the width direction of the sorting conveying line, and the length arrangement directions of the two guide plates are consistent with the conveying direction of the sorting conveying line.

Through adopting above-mentioned technical scheme, when two transfer chains of weighing convey the nut bag to the letter sorting transfer chain respectively, two deflectors lead to spacingly to two nut bags of income letter sorting transfer chain, make the transmission interval between two nut bags shorten to the work of collecting when making the feed inlet of separation box need not to have too big open area can carry out two nut bags, make things convenient for the separation box to carry out the work of sorting to the nut bag on the letter sorting transfer chain.

In summary, the present application includes at least one of the following beneficial technical effects:

1. the two weighing conveying lines are used for conveying the nut bags side by side, and a weight detection device used for an automatic nut packaging system can be used for simultaneously detecting and sorting the weights of the two nut bags, so that the weight detection efficiency of the nut bags is remarkably improved;

2. the driving motor drives the sorting box to slide back and forth along the length direction of the screw rod, so that nut bags with unqualified weights in the two nut bags smoothly slide into the sorting box, and the simultaneous sorting work of the sorting box on the two nut bags is realized;

3. make the automatic leading-in substandard product case of nut bag in the sorting box through the unloading subassembly to the sorting box of being convenient for carries out the letter sorting work of nut bag on the letter sorting transfer line repeatedly, and the staff of being convenient for carries out centralized processing to the unqualified nut bag of weight.

Drawings

FIG. 1 is a schematic overall structure diagram of a first embodiment of the present application;

FIG. 2 is a schematic structural diagram of a sorting box, a push plate and an electric push rod in the first embodiment of the application;

fig. 3 is a schematic structural diagram of a second embodiment of the present application.

Reference numerals: 1. a frame; 11. a controller; 12. a guide plate; 121. a feeding section; 13. a connecting plate; 2. a weighing conveying line; 21. a weighing device; 3. sorting and conveying lines; 4. a sorting box; 41. a feed inlet; 42. a feeding port; 43. mounting a plate; 431. perforating; 44. a through hole; 5. a drive assembly; 51. a screw rod; 52. a guide bar; 53. a drive motor; 6. a blanking assembly; 61. pushing the plate; 62. an electric push rod; 63. a support plate; 64. rotating the rod; 65. a servo motor; 7. a defective product box; 71. a collection port; 8. and a limit switch.

Detailed Description

The present application is described in further detail below with reference to figures 1-3.

The embodiment of the application discloses a weight detection device for automatic nut packaging system.

Example 1

Referring to fig. 1, the weight detecting device for the automatic nut packaging system comprises a frame 1, a weighing conveying line 2 and a sorting conveying line 3 are sequentially arranged on the frame 1, two weighing conveying lines 2 are arranged side by side, two weighing devices 21 are arranged on the two weighing conveying lines 2, the conveying ends of the two weighing conveying lines 2 are butted with the feeding end of the sorting conveying line 3, connecting plates 13 are symmetrically arranged on the frame 1 at two sides in the length direction of the sorting conveying line 3, the lower ends of the two connecting plates 13 are welded on the frame 1, the upper ends of the two connecting plates 13 are bent towards the right above the sorting conveying line 3, guide plates 12 are vertically welded at the upper ends of the two connecting plates 13, the length distribution direction of the two guide plates 12 is consistent with the conveying direction of the sorting conveying line 3, each guide plate 12 comprises a feeding section 121, and the feeding section 121 is arranged at one side close to the feeding end of the sorting conveying line 3, the distance between the two feeding sections 121 is gradually increased along the direction opposite to the conveying direction of the sorting conveying line 3; sorting transfer chain 3's discharge end horizontal slip is provided with sorting box 4, sorting box 4 is inside hollow rectangle box, sorting box 4 offers the feed inlet 41 that is suitable for the nut bag to get into towards two one side of weighing transfer chain 2, the inner diapire of feed inlet 41 is less than sorting transfer chain 3's transmission upper surface, be equipped with drive assembly 5 in the frame 1, drive assembly 5 is suitable for drive sorting box 4 and slides, so that sorting box 4 collects the unqualified nut bag of weight on the sorting transfer chain 3, sorting box 4's below is provided with substandard product case 7 in sorting transfer chain 3 length direction's bilateral symmetry, collection mouth 71 has been seted up to the up end of substandard product case 7, be equipped with unloading subassembly 6 on sorting box 4, unloading subassembly 6 is suitable for with in the leading-in substandard product case 7 of the nut bag in the sorting box 4.

Referring to fig. 1, the driving assembly 5 includes a screw 51, a guide rod 52 and a driving motor 53, the screw 51 is horizontally arranged and rotatably connected to the frame 1, the rotating axis is vertical to the conveying direction of the sorting conveying line 3, the screw rod 51 crosses the sorting conveying line 3 and is positioned right above the two defective product boxes 7, the driving motor 53 is a stepping motor, the driving motor 53 is fixed on the frame 1, the output end of the driving motor 53 is coaxially and fixedly connected with one end of the screw rod 51, the guide rod 52 is horizontally arranged on one side of the screw rod 51 far away from the sorting conveying line 3, two ends of the guide rod 52 are respectively welded on the frame 1, the length distribution direction of the guide rod 52 is consistent with that of the screw rod 51, the two ends of the guide rod 52 are respectively provided with a limit switch 8, the rack 1 is provided with a controller 11, and the controller 11 is respectively electrically connected with the two limit switches 8, the two weighing devices 21 and the driving motor 53; an installation plate 43 is horizontally welded on the upper end surface of the sorting box 4, the installation plate 43 is rectangular, the installation plate 43 is assembled on the screw rod 51 in a threaded mode, a through hole 431 is formed in the installation plate 43 along the length direction of the installation plate 43, and the guide rod 52 penetrates through the through hole 431 in a sliding mode; when weighing device 21 detected the weight of nut bag unqualified, driving motor 53 drive lead screw 51 rotated, and pivoted lead screw 51 drives mounting panel 43 and slides to drive separation box 4 through mounting panel 43 and slide to assigned position and collect in order to the unqualified nut bag of weight, realize separation box 4 to the automatic separation of nut bag.

Referring to fig. 1 and 2, in order to derive the nut bag that weight is unqualified in the separation box 4, unloading subassembly 6 includes push pedal 61 and electric putter 62, push pedal 61 is the cuboid form, push pedal 61 is vertical to be laid and slidable mounting is in separation box 4, and the length of push pedal 61 lays the direction and is laid the direction with the length of separation box 4 unanimously, the week side of push pedal 61 and the inner wall of separation box 4 slide the laminating one by one, electric putter 62 installs on the lateral wall of one side of separation box 4 keeping away from letter sorting transfer chain 3, electric putter 62 is connected with controller 11 is electric, through-hole 44 has been seted up on the separation box 4, electric putter 62's output runs through-hole 44 and welds mutually with the lateral wall that push pedal 61 kept away from one side of letter sorting transfer chain 3.

The implementation principle of the embodiment 1 is as follows: when nut bags are conveyed on the two weighing conveying lines 2, the weighing devices 21 on the two weighing conveying lines 2 respectively detect the weight of the nut bags, when one nut bag in the two nut bags is detected to be unqualified in weight by the weighing devices 21, the weighing devices 21 transmit signals to the controller 11, the controller 11 controls the driving motor 53 to work at the moment, the sorting box 4 slides to one side of the sorting conveying line 3, which is positioned at the unqualified nut bag in weight, the feeding port 41 is aligned with the discharging end part of the sorting conveying line 3 at the moment, the nut bag with the unqualified weight slides along the feeding port 41 to enter the sorting box 4, and the nut bag with the qualified weight smoothly slides out of the sorting conveying line 3 and enters the next step; when both nut bags are unqualified, the two weighing devices 21 transmit signals to the controller 11 at the same time, and the controller 11 controls the driving motor 53 to work, so that the sorting box 4 slides, the feed inlet 41 of the sorting box 4 completely faces the discharge end of the sorting conveying line 3, and both the nut bags slide into the sorting box 4; when the sorting box 4 is saturated in collecting unqualified nut bags, the controller 11 controls the driving motor 53 to work again, the driving motor 53 drives the sorting box 4 to slide to one end of the guide rod 52, the sorting box 4 is abutted against the limit switch 8 at the moment, the limit switch 8 transmits a signal to the controller 11, the controller 11 controls the driving motor 53 to stop working at the moment, and the controller 11 controls the driving electric push rod 62 to push the unqualified nut bags in the sorting box 4 to the unqualified nut bags 7.

Example 2

Referring to fig. 3, the difference between this embodiment and embodiment 1 is that the blanking assembly 6 includes a supporting plate 63, a rotating rod 64 and a servo motor 65, the lower end surface of the sorting box 4 is provided with a blanking port 42, the rotating rod 64 is horizontally arranged and arranged in the blanking port 42 along the width direction of the sorting box 4, two ends of the rotating rod 64 are respectively rotatably connected to the inner side wall of the blanking port 42, the rotating axis is consistent with the length direction of the rotating rod 64, one end of the rotating rod 64, which is far away from the feeding port 41, penetrates through the sorting box 4, the supporting plate 63 is welded to the rotating rod 64, the upper end surface of the supporting plate 63 is movably flush with the inner bottom wall of the sorting box 4, the servo motor 65 is installed on one side of the sorting box 4, which is far away from the feeding port 41, and the output end of the servo motor 65 is fixedly connected to one end of the rotating rod 64, which penetrates through the sorting box 4; when unqualified nut bag in the sorting box 4 of needs discharge, servo motor 65 drive dwang 64 rotates, and dwang 64 drives bearing board 63 and rotates to make bearing board 63 open feed opening 42, make nut bag roll-off feed opening 42 fast and fall into in the substandard product case 7, thereby realized unloading subassembly 6 to the work of deriving of unqualified nut bag in the sorting box 4.

The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.

Claims

1. The utility model provides a weight detection device for automatic packaging system of nut, includes frame (1), be equipped with transfer chain (2) and letter sorting transfer chain (3) of weighing on frame (1) in proper order, its characterized in that: the utility model discloses a nut bag sorting machine, including frame (1), weighing conveyer line (2) are provided with two side by side, two all be equipped with weighing device (21) on weighing conveyer line (2), and two the transmission end of weighing conveyer line (2) all with the feed end of letter sorting conveyer line (3) docks mutually, the discharge end of letter sorting conveyer line (3) slides and is provided with sorting box (4), and the direction of sliding with the direction of delivery of letter sorting conveyer line (3) is mutually perpendicular, sorting box (4) orientation one side of weighing conveyer line (2) is seted up feed inlet (41) that are suitable for the nut bag to get into, be equipped with drive assembly (5) on frame (1), drive assembly (5) are suitable for the drive sorting box (4) slide.

2. The weight detecting device for nut automated packaging system of claim 1, wherein: the driving assembly (5) comprises a screw rod (51), a guide rod (52) and a driving motor (53), the screw rod (51) is horizontally arranged and is connected to the rack (1) in a rotating mode, the screw rod (51) stretches across the upper portion of the sorting conveying line (3), the sorting box (4) is assembled on the screw rod (51) in a threaded mode, the driving motor (53) is fixedly arranged on the rack (1), the output end of the driving motor (53) is fixedly connected with one end of the screw rod (51) in a coaxial mode, the driving motor (53) is suitable for driving the screw rod (51) to rotate, the guide rod (52) is fixedly arranged on the rack (1), the length arrangement direction of the guide rod (52) is consistent with the length direction of the screw rod (51), and the sorting box (4) is sleeved on the guide rod (52) in a sliding mode.

3. The weight detecting device for nut automated packaging system of claim 2, wherein: be equipped with unloading subassembly (6) on sorting box (4), unloading subassembly (6) are suitable for deriving the nut bag in sorting box (4).

4. The weight detecting device for nut automated packaging system of claim 3, wherein: unloading subassembly (6) include push pedal (61) and electric putter (62), push pedal (61) vertically lay and slidable mounting in sorting box (4), the length of push pedal (61) lay the direction with the length of sorting box (4) is laid the direction and is unanimous, just the bottom of push pedal (61) slide the laminating in on the interior diapire of sorting box (4), electric putter (62) are located the outside of sorting box (4), the output of electric putter (62) runs through sorting box (4) and with push pedal (61) looks rigid coupling, electric putter (62) are suitable for the drive push pedal (61) carry out reciprocating sliding along the direction of delivery of nut bag.

5. The weight detecting device for nut automated packaging system of claim 4, wherein: unloading subassembly (6) are including bearing board (63), dwang (64) and servo motor (65), feed opening (42) have been seted up to the lower terminal surface of separation box (4), dwang (64) level lay and rotate install in feed opening (42), wear out the one end of dwang (64) separation box (4), bearing board (63) set firmly in on dwang (64), the up end of bearing board (63) with the interior diapire activity parallel and level of separation box (4), servo motor (65) set firmly in separation box (4) are kept away from one side of feed inlet (41), the output of servo motor (65) with dwang (64) are worn out the one end looks rigid coupling of separation box (4), servo motor (65) are suitable for the drive dwang (64) rotate.

6. The weight detecting device for nut automated packaging system of claim 5, wherein: the sorting conveyor line is characterized in that defective product boxes (7) are arranged on two sides of the sorting conveyor line (3), a collecting opening (71) is formed in the upper end face of each defective product box (7), and when the sorting box (4) slides to one end of the guide rod (52), the sorting box (4) is located right above the collecting opening (71) of one defective product box (7).

7. The weight detecting device for nut automated packaging system of claim 6, wherein: the sorting device is characterized in that limit switches (8) are arranged at two ends of the guide rod (52), a controller (11) is arranged on the rack (1), the controller (11) is electrically connected with the two limit switches (8), the controller (11) is electrically connected with the electric push rod (62) or the servo motor (65), and when the sorting box (4) abuts against one limit switch (8), the sorting box (4) is located right above one defective box (7).

8. The weight detecting device for nut automated packaging system of claim 1, wherein: be equipped with two deflector (12) on frame (1), two deflector (12) all are located separation box (4) with weigh between transfer chain (2), and two deflector (12) all are located the top of letter sorting transfer chain (3), two deflector (12) symmetry is laid sort transfer chain (3) width direction's both sides, two the length of deflector (12) is laid the direction all with the direction of delivery of letter sorting transfer chain (3) is unanimous mutually.