External feeding mechanism and packing scale

Abstract

The utility model provides an external feeding mechanism. The external feeding mechanism comprises a first frame body, first supporting parts are coaxially arranged at the two ends of the first supporting roller, second supporting parts are coaxially arranged at the two ends of the second supporting roller, and a motor used for driving the first supporting parts or the second supporting parts to rotate is arranged on a first frame body; the two ends of the conveying belt are movably connected to the first supporting roller and the second supporting roller in a sleeving mode correspondingly. The bottom of the conveying belt part located on the upper portion is movably attached to the top of the first supporting body. The third supporting roller is vertically located on the side portion of the conveying belt, and the third supporting roller is higher than the conveying belt. The driving mechanism is used for driving the third supporting roller to rotate; the two ends of the supporting belt are movably connected to the two third supporting rollers in a sleeving mode correspondingly, the moving direction of the top of the conveying belt is the same as the moving direction of the side, close to the conveying belt, of the supporting belt, and the linear speed of the conveying belt is equal to that of the supporting belt. The external feeding mechanism provided by the utility model can improve the use stability.

Description

TECHNICAL FIELD

[0001] The utility model belongs to packing scale technical field relates to a outside material feeding mechanism and packing scale. BACKGROUND

[0002] Quantitative packing scale is usually composed of weighing unit, bagging conveying device, pneumatic system, dust removal system, quantitative packing control instrument and the like. The key component affecting the bagging speed and accuracy is the weighing unit, which includes storage bin, gate, material cutting device, scale body, bag clamping device, support, electrical control device and the like. The storage bin is a buffer type bin for material storage and providing a nearly uniform material flow; the gate is located at the bottom of the storage bin and is used to block the material in the storage bin when the equipment is under maintenance or failure; the material cutting device is composed of cutting hopper, cutting gate, pneumatic element, air supplement gate and the like, which provides fast and slow two-stage feeding during the weighing process, and the fast and slow material flows can be adjusted independently to ensure that the quantitative packing scale meets the accuracy and speed requirements of the metering; the air supplement gate balances the air pressure difference in the system during the weighing; the scale body is mainly composed of weighing hopper, load-bearing support and weighing sensor, which completes the conversion of weight to electrical signal and transmits it to the control unit; the bag clamping device is mainly composed of bag clamping mechanism, pneumatic element and the like, which clamps the packaging bag and allows the weighed material to fall into the packaging bag; the electrical control device is composed of weighing display controller, electrical components and control cabinet, which controls the system to work in order according to the pre-set program.

[0003] At present, the bagging conveying device is used to support and convey the packaging bag, and after a certain amount of material is loaded into the packaging bag, the bagging conveying device conveys the packaging bag to the automatic line breaking and sealing machine downstream, and the top opening of the packaging bag is automatically sealed by the sealing machine to complete the bagging. The common bagging conveying device mainly includes a conveying belt with a bottom and a blocking frame located at the side of the conveying belt; the conveying belt is used to support and convey the packaging bag, and the blocking frame is used to abut against the side of the packaging bag (the packaging bag is slightly inclined towards the blocking frame) to prevent the packaging bag from falling down. However, it is found in practice that since the packaging bag and the blocking frame slide relative to each other, if the inclination angle of the packaging bag is too small or too much material is loaded into the packaging bag, the friction between the blocking frame and the packaging bag is too large, which causes the packaging bag to fall down, and the use stability is poor. UTILITY MODEL CONTENTS

[0004] The utility model aims at providing an outside material feeding mechanism and packing scale, and aims at solving the problem of poor use stability.

[0005] To solve the above technical problems, the utility model provides an outside material feeding mechanism, which comprises:

[0006] The first frame body is oppositely provided with two pairs of first frame bodies.

[0007] The first supporting roller has first supporting parts coaxially arranged at both ends thereof, and the second supporting roller has second supporting parts coaxially arranged at both ends thereof, and the first supporting parts and the second supporting parts are respectively connected with the first frame bodies in rotation, and a motor for driving the first supporting parts or the second supporting parts to rotate is arranged on the first frame bodies;

[0008] A transmission belt is movably sleeved at both ends of the first supporting roller and the second supporting roller;

[0009] A first supporting body is movably attached to the top of the first supporting body at the bottom of the upper part of the transmission belt;

[0010] A third supporting roller is vertically arranged at the side of the transmission belt, and the third supporting roller is higher than the transmission belt;

[0011] A driving mechanism is arranged for driving the third supporting roller to rotate;

[0012] A supporting belt is movably sleeved at both ends of the two third supporting rollers, the movement direction of the top of the transmission belt is the same as that of the side of the supporting belt close to the transmission belt, and the linear speed of the transmission belt is equal to that of the supporting belt.

[0013] The utility model further sets up, still include vertical second frame body, the top of second frame body both ends all horizontally be provided with connecting arm, the bottom of connecting arm free end is vertically provided with support arm, the third supporting roller rotation sleeve is connected to the outer wall of support arm.

[0014] The utility model further sets up, the side of second frame body is provided with first connecting portion, and the side of first supporting body is fixedly connected with first connecting portion.

[0015] The utility model further sets up, the top of second frame body is provided with second connecting portion with the longitudinal section of L character shape, the bottom of second connecting portion is vertically provided with second supporting body, and the outside of the side of supporting belt close to transmission belt is movably attached to second supporting body.

[0016] The utility model further sets up, the bottom of support arm is higher than the bottom of third supporting roller, and the driving mechanism includes linkage column vertically arranged at the bottom of third supporting roller, and the bottom of linkage column is horizontally provided with passive bevel gear;

[0017] The middle part of one end of the first supporting roller is provided with a cylindrical accommodating groove, the diameter of the accommodating groove is smaller than the diameter of the first supporting roller, the first supporting part is connected with the inner wall of the accommodating groove, the first supporting part is provided with a driving bevel gear meshing with the driven bevel gear, and the movement track of the driven bevel gear is spaced from the first supporting roller.

[0018] The utility model further sets up, vertical third frame body is set up on the first frame body, the top of third frame body horizontal set up one support cylinder and a plurality of guide cylinders, every guide cylinder all horizontal swingly set up one guide rod in, and the outer wall of guide rod is swingly attached to the inner wall of guide cylinder, the inner wall of support cylinder is rotationally arranged with adjusting cylinder, passes through the inner wall of adjusting cylinder and is provided with the adjusting rod with the thread cooperation of adjusting cylinder;

[0019] Still include the guide board, the guide board is located between the third frame body and the support band, the side of the guide board away from the support band is fixedly connected with the end of all guide rods and the end of adjusting rod.

[0020] The utility model further sets up, the outer wall of both ends of adjusting cylinder all is provided with anti -drop disc, two anti -drop disc is swingly attached to the outside of both ends of support cylinder respectively, the outer wall of anti -drop disc away from support band is intervally provided with a plurality of rotating rods.

[0021] The utility model further sets up, the side of guide board close to the support band is rotationally arranged with a plurality of drag reduction columns, the guide board includes guide portion and the limit portion that is connected with one end of guide portion, the plane of limit portion is parallel with the plane of support band, the cross section of guide portion is arc, and the minimum distance between the end of guide portion away from limit portion and support band is greater than the minimum distance between limit portion and support band.

[0022] The utility model further sets up, the bottom of a guide cylinder is vertically provided with an indication frame, the bottom of indication frame is horizontally provided with an indication cylinder, the middle part of indication cylinder is provided with indication hole that the longitudinal section is rectangle, the side of indication cylinder is provided with the accommodation opening that is communicated with indication hole, the end of accommodation opening away from support band penetrates indication cylinder;

[0023] Still include the indication board, the outer wall of indication board is swingly attached to the inner wall of indication hole, one side of indication board is provided with indication convex or is provided with indication recessed groove;

[0024] The indicating cylinder is provided with a termination seat near one end of the supporting belt, the side of the indicating plate is provided with a clamping seat which can be moved into the accommodation opening, the free end of the clamping seat is provided with a movable seat, the movable seat and the termination seat are provided with elastic members, the elastic members and the indicating protrusions or the indicating grooves are located on both sides of the indicating plate, the elastic members are in a compressed state when the end of the indicating plate abuts against the supporting belt, the bottom of the guide plate is provided with a pointed reading member, and the bottom of the reading member is located above the movable track of the indicating plate.

[0025] The utility model discloses still announce a kind of packing scale, including any one of the above-mentioned outer feeding mechanism.

[0026] Compared with prior art, the utility model provides a kind of outer feeding mechanism, and the transmission belt is located below the discharge port of packing scale (prior art) when being used;Specific use when worker first suit connects in the discharge port of packing scale, then the both sides of packaging bag are clamped and adhered to the both sides of discharge passage, after that, the discharge port is opened, and the material of good quality is fallen into packaging bag;After that, the structure of clamping packaging bag loosens packaging bag;At this time, motor drives first support part, second support part, first support roller, second support roller and transmission belt to be active, and packaging bag is transported downstream (it can be sent to sealing machine to seal, also can be directly sent to next station to carry out other operations, such as continue to load other material etc.;But the operation downstream is not the content of the application claimed protection);At the same time, the side of packaging bag is abutted against the inner side of supporting belt at this time, since the movement direction and linear velocity of the inner side of supporting belt are same with the top of transmission belt, therefore, supporting belt can keep synchronous and forwardly transport packaging bag, so the position stability of packaging bag can be fully guaranteed, and it is difficult to occur dumping etc., improve use stability. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 It is the structure diagram of the utility model Figure 1 ;

[0028] Figure 2 It is Figure 1 the enlarged view of part A in

[0029] Figure 3 It is Figure 1 the enlarged view of part B in

[0030] Figure 4 It is the structure diagram of the utility model Figure 2 ;

[0031] Figure 5 It is Figure 4 the enlarged view of part C in

[0032] Figure 6is Figure 4 is a zoomed view of part D in

[0033] Figure 7 is a structure diagram of the utility model Figure 3 ;

[0034] Figure 8 is Figure 7 is a zoomed view of part E in

[0035] Figure 9 is a sectional view of the utility model

[0036] Figure 10 is a zoomed view of part F in Figure 9

[0037] Wherein, 1, first frame body;2, first support roller;3, second support roller;4, first support part;6, motor;7, transmission belt;8, first support body;9, third support roller;10, support belt;11, second frame body;12, connecting arm;13, support arm;14, first connecting part;15, second connecting part;16, second support body;17, linkage column;18, passive bevel gear;19, containing groove;20, driving bevel gear;21, third frame body;22, support cylinder;23, guide cylinder;24, guide rod;25, adjusting cylinder;26, adjusting rod;27, guide plate;27a, guide part;27b, limiting part;28, anti-off disc;29, rotating rod;30, resistance reducing column;31, indicating frame;32, indicating cylinder;33, let go of mouth;34, indicating plate;35, indicating recess;36, termination seat;37, clamping seat;38, movable seat;39, elastic member;40, reading member. DETAILED DESCRIPTION

[0038] The utility model proposes a kind of outer feeding mechanism and packaging scale further detailed below in conjunction with drawings and specific embodiment.The advantages and characteristics of the utility model will be clearer according to the following description.It should be noted that, drawings are all very simplified form and all use non-precise scale, just to facilitate, clearly assist the purpose of the description of the embodiment of the utility model.Same or similar reference numerals in the drawings represent the same or similar parts.

[0039] A kind of outer feeding mechanism, as Figures 1 to 10 shown, comprising:

[0040] First frame body 1, the first frame body 1 is oppositely provided with two pairs;

[0041] ​First support roller 2 and second support roller 3, both ends of the first support roller 2 are coaxially provided with first support part 4, both ends of the second support roller 3 are coaxially provided with second support part, the first support part 4 and the second support part are respectively connected with the first frame body 1 rotationally, a motor 6 is arranged on the first frame body 1 for driving the first support part 4 or the second support part to rotate;

[0042] Transmission belt 7, both ends of the transmission belt 7 are movably sleeved on the first support roller 2 and the second support roller 3 respectively;

[0043] First support body 8, the bottom of the upper transmission belt part is movably attached to the top of the first support body 8;

[0044] Third support roller 9, the third support roller 9 is vertically arranged on the side of the transmission belt 7, and the third support roller 9 is higher than the transmission belt 7;

[0045] Driving mechanism, the driving mechanism is used for driving the third support roller 9 to rotate;

[0046] Supporting belt 10, both ends of the supporting belt 10 are movably sleeved on two third support rollers 9, the movement direction of the top of the transmission belt 7 is the same as the movement direction of the side of the supporting belt 10 close to the transmission belt 7, and the linear speed of the transmission belt 7 is equal to the linear speed of the supporting belt 10.

[0047] It also includes a vertical second frame body 11, both ends of the top of the second frame body 11 are horizontally provided with connecting arms 12, the bottom of the free end of the connecting arm 12 is vertically provided with a support arm 13, and the third support roller 9 is rotatably sleeved on the outer wall of the support arm 13.

[0048] The side of the second frame body 11 is provided with a first connecting part 14, and the side of the first support body 8 is fixedly connected with the first connecting part 14.

[0049] The top of the second frame body 11 is provided with a second connecting part 15 with an L-shaped longitudinal section, the bottom of the second connecting part 15 is vertically provided with a second support body 16, and the outside of the side of the supporting belt 10 close to the transmission belt 7 is movably attached to the second support body 16.

[0050] The bottom of the support arm 13 is higher than the bottom of the third support roller 9, and the driving mechanism includes a linkage column 17 vertically arranged at the bottom of the third support roller 9, and a passive bevel gear 18 is horizontally arranged at the bottom of the linkage column 17;

[0051] The middle part of one end of the first supporting roller 2 is provided with a cylindrical accommodating groove 19, the diameter of the accommodating groove 19 is smaller than the diameter of the first supporting roller 2, the first supporting part 4 is connected with the inner wall of the accommodating groove 19, the first supporting part 4 is provided with a driving bevel gear 20 which is engaged with the driven bevel gear 18, and the movement track of the driven bevel gear 18 is spaced from the first supporting roller 2.

[0052] The third frame body 21 is vertically arranged on the first frame body 1, the top of the third frame body 21 is horizontally provided with a supporting cylinder 22 and a plurality of guide cylinders 23, each of the guide cylinders 23 is horizontally movably provided with a guide rod 24, the outer wall of the guide rod 24 is movably attached to the inner wall of the guide cylinder 23, the inner wall of the supporting cylinder 22 is rotatably provided with an adjusting cylinder 25, the inner wall of the adjusting cylinder 25 is provided with an adjusting rod 26 which is threadedly connected with the adjusting cylinder 25.

[0053] The guide plate 27 is arranged between the third frame body 21 and the supporting belt 10, the side of the guide plate 27 which is away from the supporting belt 10 is fixedly connected with the end of each of the guide rods 24 and the end of the adjusting rod 26.

[0054] The outer wall of each end of the adjusting cylinder 25 is provided with an anti-falling disc 28, the two anti-falling discs 28 are movably attached to the outer side of each end of the supporting cylinder 22, and the outer wall of the anti-falling disc 28 which is away from the supporting belt 10 is provided with a plurality of rotating rods 29 which are arranged at intervals.

[0055] The side of the guide plate 27 which is close to the supporting belt 10 is vertically rotatably provided with a plurality of drag-reducing columns 30, the guide plate 27 comprises a guide part 27a and a limiting part 27b which is connected with one end of the guide part 27a, the plane on which the limiting part 27b is arranged is parallel to the plane on which the supporting belt 10 is arranged, the cross section of the guide part 27a is arc-shaped, and the minimum distance between the end of the guide part 27a which is away from the limiting part 27b and the supporting belt 10 is greater than the minimum distance between the limiting part 27b and the supporting belt 10.

[0056] The bottom of one of the guide cylinders 23 is vertically provided with an indicating frame 31, the bottom of the indicating frame 31 is horizontally provided with an indicating cylinder 32, the middle part of the indicating cylinder 32 is provided with an indicating hole which has a rectangular longitudinal section, the side of the indicating cylinder 32 which is horizontal is provided with a clearance 33 which is communicated with the indicating hole, and the end of the clearance 33 which is away from the supporting belt 10 penetrates the indicating cylinder 32.

[0057] The indicating plate 34 is movably attached to the inner wall of the indicating hole, and one side of the indicating plate 34 is provided with an indicating protrusion or an indicating groove 35.

[0058] The indicating cylinder 32 is provided with a termination seat 36 near one end of the support belt 10, the side of the indicating plate 34 is provided with a clamping seat 37 which can be movably entered into the accommodation opening 33, the free end of the clamping seat 37 is provided with a movable seat 38, the elastic member 39 is arranged between the movable seat 38 and the termination seat 36, the elastic member 39 is located on both sides of the indicating protrusion or the indicating groove 35 of the indicating plate 34, when the end of the indicating plate 34 abuts against the support belt 10, the elastic member 39 is in a compressed state, the bottom of the guide plate 27 is provided with a pointed reading member 40, the bottom of the reading member 40 is located above the movable track of the indicating plate 34.

[0059] The utility model discloses still announce a kind of packing scale, including any one of the above-mentioned outer feeding mechanism.

[0060] The outer feeding mechanism provided by the utility model, when using, the transmission belt 7 is located below the discharge port of the packing scale (prior art);Specifically, when using, workers first sleeve the packaging bag at the discharge port of the packing scale, then the two sides of the packaging bag are clamped and fitted on the two sides of the discharge passage, then the discharge port is opened, and the material of good quality falls into the packaging bag;Then the structure of clamping the packaging bag releases the packaging bag;At this time, the motor 6 drives the first support part 4, the second support part, the first support roller 2, the second support roller 3 and the transmission belt 7 to move, and the packaging bag is conveyed downstream (it can be sent to the sealing machine for sealing, or it can be directly sent to the next station for other operations, such as continuing to load other materials, etc.;But the operation downstream is not the content required to be protected by the utility model);At the same time, the side of the packaging bag is abutted against the inner side of the support belt 10 at this time, because the movement direction and linear velocity of the inner side of the support belt 10 are the same as those of the top of the transmission belt 7, therefore the support belt 10 can keep synchronous conveying of the packaging bag forward, so the position stability of the packaging bag can be fully guaranteed, and it is difficult to occur dumping and the like, and the use stability is improved.

[0061] In actual use, the packaging bag is transmitted by the transmission belt 7 at the same time, and its weight is also supported by the first support body 8 at the same time, so that the transmission belt 7 can be well prevented from deforming, and the second support body 16 can support the support belt 10, so that the support belt 10 can be prevented from deforming. The top of the first support body 8 and the side of the second support body 16 close to the transmission belt 7 can be rotatably provided with a cylinder (the length direction thereof is perpendicular to the length direction of the transmission belt 7) or a sphere, for reducing the resistance of the support belt 10 and the transmission belt 7.

[0062] When the motor 6 drives the first support part 4 or the second support part to rotate (preferably drives the first support part 4 to rotate, the shape and other structures in the figure are only schematic, and the proportion is only schematic), the driving bevel gear 20 can also be driven to rotate, and the driving bevel gear 20 drives the passive bevel gear 18, the linkage column 17 and the third support roller 9 to rotate, so that the support belt 10 can be driven to rotate, and through the proportion and shape of each structure, the linear velocity of the support belt 10 is equal to the linear velocity of the conveying belt 7. The driving bevel gear 20 is located in the accommodating groove 19, so that the conveying belt 7 and the support belt 10 can have a small gap, the conveying stability of the packaging bag is improved, the uniformity of the movement between the support belt 10 and the conveying belt can be ensured, whether starting or stopping, the synchronization can be very good, and the stability of the packaging bag is further ensured; and only one motor 6 is needed without high-end program control, and the cost is low.

[0063] The outer side of the packaging bag can also be movably attached to the side of the guide plate 27, that is, the guide plate 27 can further improve the position stability of the packaging bag. In actual use, if the inclination angle of the packaging bag is small, that is, it is more inclined to the support belt 10, the guide plate 27 is not needed for assistance; but if the packaging bag is full of material or other reasons cause it to be placed vertically, the guide plate 27 is needed for assistance at this time; at this time, the guide plate 27 and the support belt 10 act on both sides of the packaging bag, so that the position stability of the packaging bag is ensured.

[0064] The guide part 27a is inclined, which can more facilitate the packaging bag to enter between the guide part 27a and the support belt 10; and the rolling drag reduction column 30 can reduce the resistance of the packaging bag, so that the packaging bag can more smoothly move forward.

[0065] Different packaging bags have different thicknesses, so the spacing between the guide plate 27 and the support belt 10 is also different, which needs to be adjusted according to actual conditions. When adjusting, the worker only needs to manually rotate the rotating rod 29, the rotating rod 29 drives the anti-dropping disc 28 and the adjusting cylinder 25 to rotate, so that the adjusting rod 26 is driven to approach or move away from the support belt 10, and the guide plate 27 is also driven to approach or move away from the support belt 10, which is simple and convenient. The anti-dropping disc 28 abuts against the outside of both ends of the support cylinder 22, so that the position stability of the adjusting cylinder 25 can be ensured.

[0066] After the position of the guide plate 27 is roughly adjusted to be appropriate, the worker manually pushes the movable seat 38 until the indicating plate 34 abuts against the support belt 10, and at this time, the approximate distance between the guide plate 27 and the support belt 10 can be read through the reading part 40, so that whether the position of the guide plate 27 is appropriate can be judged. The position of the guide plate 27 is not required to be very accurate, and only needs to be roughly appropriate in actual use.

[0067] When the pusher is pushed, the indicator 34 is also driven to move by the engaging seat 37, and since the engaging seat 37 can enter the accommodating hole 33, the indicator 34 can move in a wider range. The indicator projection or the indicator groove 35 (preferably the indicator groove 35, so that the indicator 34 and the indicator cylinder 32 can move relative to each other more smoothly) is similar to the marks on a ruler, and can be mainly read by workers. The readout 40 makes reading more convenient and fast. After the readout is completed, the elastic member 39 drives the indicator 34 to automatically reset, and the worker does not need to manually reset. After the reset is completed, the indicator 34 is still in the indicator hole and does not come out.

[0068] It should be further noted that all the "provides" and similar descriptions in the present application (especially the specification) express that there is a connection relationship between two structures, but the specific connection means is not limited too much, and is usually a conventional connection means, that is, it should be understood that the means is prior art, and does not need to be described too much. For example, "m is provided with n", only expresses that m structure has n structure, and the specific connection between the two is through welding, riveting, adhesive connection or integral molding, which is within the protection scope of the present application. For example, "x is provided with y", only expresses that y and x can rotate relative to each other, and as for whether the two are connected through a bearing to rotate, or y directly penetrates x to rotate with x, or other realizable ways, which are within the protection scope of the present application.

[0069] The above description is only a description of the preferred embodiment of the present application, and is not any limitation on the scope of the present application. Any modification or modification of the above disclosure by a person skilled in the art is within the protection scope of the claims.

Claims

1. An outfeed mechanism characterized in that, The utility model provides a kind of vertical transmission device, including: First frame body (1), the first frame body (1) is oppositely provided with two pairs; First support roller (2) and second support roller (3), the two ends of the first support roller (2) are coaxially provided with first support part (4), the two ends of the second support roller (3) are coaxially provided with second support part, the first support part (4) and the second support part are respectively rotatably connected with a first frame body (1), a first frame body (1) is provided with motor (6) for driving the first support part (4) or the second support part rotates; Transmission belt (7), the two ends of the transmission belt (7) are movably sleeved on the first support roller (2) and the second support roller (3) respectively; First support body (8), the bottom of the upper transmission belt (7) part is movably attached to the top of the first support body (8); Third support roller (9), the third support roller (9) is vertically located on the side of the transmission belt (7), and the third support roller (9) is higher than the transmission belt (7); Driving mechanism, the driving mechanism is used to drive the third support roller (9) to rotate; Support belt (10), the two ends of the support belt (10) are movably sleeved on two third support rollers (9), the movement direction of the top of the transmission belt (7) is the same as the movement direction of the side of the support belt (10) close to the transmission belt (7), and the linear velocity of the transmission belt (7) is equal to the linear velocity of the support belt (10).

2. An external feeding mechanism according to claim 1, characterized in that It also includes a vertical second frame body (11), the top of the second frame body (11) is provided with a connecting arm (12) at both ends, the bottom of the free end of the connecting arm (12) is vertically provided with a support arm (13), and the third support roller (9) is rotatably sleeved on the outer wall of the support arm (13).

3. An external material feeding mechanism according to claim 2, wherein The side of the second frame body (11) is provided with a first connecting part (14), and the side of the first support body (8) is fixedly connected with the first connecting part (14).

4. An external material feeding mechanism according to claim 3, wherein The top of the second frame body (11) is provided with a second connecting part (15) with an L-shaped longitudinal section, the bottom of the second connecting part (15) is vertically provided with a second support body (16), and the outer part of the side of the support belt (10) close to the transmission belt (7) is movably attached to the second support body (16).

5. An external feed mechanism according to claim 2, wherein The bottom of the support arm (13) is higher than the bottom of the third support roller (9), and the driving mechanism includes a linkage column (17) vertically arranged at the bottom of the third support roller (9), and the bottom of the linkage column (17) is horizontally provided with a passive bevel gear (18). A cylindrical accommodating groove (19) is formed in the middle of one end of the first support roller (2), the diameter of the accommodating groove (19) is smaller than the diameter of the first support roller (2), and the first support part (4) is connected with the inner wall of the accommodating groove (19), the first support part (4) is provided with a driving bevel gear (20) engaged with the passive bevel gear (18), and the movement track of the passive bevel gear (18) is spaced from the first support roller (2).

6. An outfeed mechanism according to claim 1, wherein, The first frame body (1) is vertically provided with a third frame body (21), the top of the third frame body (21) is horizontally provided with a supporting cylinder (22) and a plurality of guide cylinders (23), each of the guide cylinders (23) is horizontally movably provided with a guide rod (24), and the outer wall of the guide rod (24) is movably attached to the inner wall of the guide cylinder (23), the inner wall of the supporting cylinder (22) is rotatably provided with an adjusting cylinder (25), and the inner wall of the adjusting cylinder (25) is provided with an adjusting rod (26) which is threadedly connected with the adjusting cylinder (25). Further comprising a guide plate (27), the guide plate (27) is located between the third frame body (21) and the supporting belt (10), and the side, away from the supporting belt (10), of the guide plate (27) is fixedly connected with the end of all the guide rods (24) and the end of the adjusting rod (26).

7. An external material feeding mechanism according to claim 6, characterized in that The outer walls of both ends of the adjusting cylinder (25) are provided with anti-disengagement discs (28), the two anti-disengagement discs (28) are movably attached to the outer sides of both ends of the supporting cylinder (22), and the outer wall of the anti-disengagement disc (28) away from the supporting belt (10) is provided with a plurality of rotating rods (29) at intervals.

8. An external material feeding mechanism according to claim 6, wherein The side, close to the supporting belt (10), of the guide plate (27) is vertically rotatably provided with a plurality of drag-reducing columns (30), the guide plate (27) comprises a guide portion (27a) and a limiting portion (27b) connected with one end of the guide portion (27a), the plane where the limiting portion (27b) is located is parallel to the plane where the supporting belt (10) is located, the cross section of the guide portion (27a) is arc-shaped, and the minimum distance between the end of the guide portion (27a) away from the limiting portion (27b) and the supporting belt (10) is greater than the minimum distance between the limiting portion (27b) and the supporting belt (10).

9. An external material feeding mechanism according to claim 6, wherein The bottom of one of the guide cylinders (23) is vertically provided with an indicating frame (31), the bottom of the indicating frame (31) is horizontally provided with an indicating cylinder (32), a longitudinal section of the indicating hole of the indicating cylinder (32) is rectangular, the side of the indicating cylinder (32) is provided with a clearance (33) which is in communication with the indicating hole, and the end of the clearance (33) away from the supporting belt (10) penetrates the indicating cylinder (32); Further comprising an indicating plate (34), the outer wall of the indicating plate (34) is movably attached to the inner wall of the indicating hole, and one side of the indicating plate (34) is provided with an indicating protrusion or an indicating groove (35). The indicating cylinder (32) is provided with a terminal seat (36) near one end of the supporting belt (10), the side of the indicating plate (34) is provided with a clamping seat (37) which can be moved into the gap (33), the free end of the clamping seat (37) is provided with a movable seat (38), the movable seat (38) and the terminal seat (36) are provided with elastic members (39) therebetween, the elastic members (39) are located on both sides of the indicating convex or the indicating groove (35) of the indicating plate (34), the elastic members (39) are in a compressed state when the end of the indicating plate (34) is in contact with the supporting belt (10), the bottom of the guide plate (27) is provided with a pointed reading member (40), the bottom of the reading member (40) is above the movable track of the indicating plate (34).

10. A packaging scale characterized by, An external feeding mechanism comprising a device according to any one of claims 1 to 9.

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