Automatic bolt weighing and packing device

Abstract

The invention provides an automatic bolt weighing and packaging device, and relates to the technical field of bolt packaging, the automatic bolt weighing and packaging device comprises a first electric conveying belt, one end of the first electric conveying belt is provided with a storage hopper, and the other end of the first electric conveying belt is provided with an electronic scale and a CCD camera; a grating piece and an adjusting piece are arranged between the electronic scale and the first electric conveying belt. The grating piece comprises longitudinal rods and elastic transverse rods which are arranged side by side and can move on the longitudinal rods. The adjusting piece comprises a movably-arranged push block, and a part of the push block is located between the two adjacent transverse rods and used for pushing the transverse rods to move. When the bolt passes through the transverse rods arranged side by side, the zinc skin on the bolt falls into the collecting hopper from the grating gap formed by the two adjacent transverse rods to be collected, and the situation that when the bolt is shot and counted by a CCD camera and is weighed and checked by an electronic scale, the zinc skin or other sundries are counted in, and consequently the counting error is caused can be avoided.

Description

Technical Field

[0001] The invention relates to the technical field of bolt packaging, and in particular to an automatic weighing and packaging device for bolts. Background Art

[0002] Bolt weighing is an effective means of quality control. By weighing each bolt, you can check whether it meets the designed weight standard. The weight of the bolt is closely related to its size, material density and other factors. If the weight of the bolt exceeds the specified range, it may mean that its size does not meet the requirements or there is a problem with the material. For the same batch of bolts, weight consistency is also important. In high-precision mechanical assembly, such as the assembly of aerospace equipment or precision machine tools, slight differences in bolt weight may affect the balance and accuracy of the entire system. Weighing can screen out bolts that do not meet the weight requirements, ensure the quality stability of the same batch of bolts, and avoid the rupture of the packaging bag during transportation and packaging; weighing and packaging devices will be used in the bolt weighing process; For example, the prior art application number CN202110265427.4 discloses a weighing and packing machine for a bolt production line, which relates to a bolt production line and aims to solve the problem that the packing process of bolts is generally completed manually by workers, which wastes labor and is inefficient. The main points of its technical solution are: a weighing and packing machine for a bolt production line, including a material storage table, a weighing device, a material pouring mechanism, a filling pipeline, a packaging film feeding mechanism, a vertical sealing mechanism, a horizontal sealing and cutting mechanism, and a material unloading conveyor belt; It is known through actual use that the above-mentioned prior art mainly pours the bolts into a storage table, weighs the bolts through a weighing device, and finally injects them into bags through a filling pipeline for packaging; however, during the use of the above-mentioned prior art, it is impossible to remove the residual zinc scale or debris on the surface of the bolts, so the residual zinc scale or debris on the bolts can easily cause a large weighing error, resulting in inaccurate weighing of the bolts, which requires repeated weighing for many times, seriously affecting the efficiency of bolt weighing; for this reason, we have improved the above-mentioned prior art according to actual usage. Summary of the invention

[0003] In view of the problem that the above-mentioned prior art cannot remove the residual zinc scale or debris on the surface of the bolt, so the residual zinc scale or debris on the bolt is likely to cause a large weighing error, resulting in inaccurate bolt weighing, and repeated weighing is required, which seriously affects the efficiency of bolt weighing. The present invention aims to provide an automatic weighing and packaging device for bolts.

[0004] To achieve the technical purpose, the solution of the present invention is: an automatic weighing and packaging device for bolts, including a No. 1 electric conveyor belt, a storage hopper is provided at one end of the No. 1 electric conveyor belt, an electronic scale and a CCD camera are provided at the other end of the No. 1 electric conveyor belt, and a grid member and an adjusting member are provided between the electronic scale and the No. 1 electric conveyor belt; the grid member includes a longitudinal rod and a cross rod that is elastic and movable on the longitudinal rod and arranged side by side; the adjusting member includes a movably arranged push block and a part of the push block is located between two adjacent cross rods for pushing the cross rod to move.

[0005] Preferably, a vibrating part and a collecting hopper are provided below the cross bar, and a No. 2 electric conveyor belt is provided between the cross bar and the electronic scale; a No. 3 electric conveyor belt is provided at one end of the No. 1 electric conveyor belt, and the No. 3 electric conveyor belt is located below the outlet end of the electronic scale, a control panel is provided on one side of the No. 3 electric conveyor belt, and a packaging piece is provided at one end of the No. 3 electric conveyor belt.

[0006] Preferably, the rear end of the longitudinal rod is welded to a cross bar on the front side and then passes through a number of cross bars, a No. 1 spring is arranged between two adjacent cross bars, and the No. 1 spring is sleeved on the outer periphery of the longitudinal rod; one end of the No. 1 spring is welded to the outer surface of the longitudinal rod and the other end of the No. 1 spring is welded to the cross bar; one end of each cross bar close to the electronic scale is arranged to be tilted downward, and the upper surfaces of the two cross bars located on the front and rear sides are integrally provided with baffles.

[0007] Preferably, side plates are fixed at both ends of the longitudinal rod, a push plate is slidably arranged between the two side plates, and push blocks are fixed on the inner sides of the two push plates to drive the push blocks to move; a servo motor is arranged on one side of one of the push plates, a bidirectional screw is fixed on the output end of the servo motor and the bidirectional screw is threadedly arranged with the two push plates; a slope is arranged on one side of each push block, and the slope is tightly pressed against the outer surface of the cross bar.

[0008] Preferably, a vibrating member is provided at one end of the No. 1 electric conveyor belt, and the vibrating member includes a vibration motor and a connecting frame, and the vibration motor is fixed on the upper surface of the connecting frame; a pin rod is integrally provided on the lower surface of the connecting frame, and a No. 2 spring and an ear block are sleeved on the outer periphery of the pin rod, and one end of each of the ear blocks is fixed to the side plate, one end of the No. 2 spring is welded to the lower surface of the ear block, and the other end of the No. 2 spring is pulled and welded to the pin rod; a collecting hopper is fixed to the lower surface of the side plate, and one end of the side plate is connected to the No. 2 electric conveyor belt, and an electronic scale is fixed to one end of the No. 2 electric conveyor belt.

[0009] Preferably, the packaging includes a pallet and a packaging bag, the packaging bag is clamped on the outer periphery of the pallet, a fixing rod is welded to one end of the No. 3 electric conveyor belt, and one end of the fixing rod is fixed to the lower surface of the pallet.

[0010] Preferably, the card plate is semicircular and the open end of the card plate is away from the No. 3 electric conveyor belt, an arc-shaped groove is arranged inside the card plate, and a protrusion is integrally arranged on the top wall of the arc-shaped groove.

[0011] Preferably, an elastic band is inserted into the opening of the packing bag, and after the packing bag is sleeved on the cardboard, the elastic band is clamped in the arc groove and the elastic band is hooked with the protrusion; Preferably, a No. 3 spring is welded on the lower surface of the storage hopper, a feed plate is welded on the lower end of the No. 3 spring, and the feed plate is located above the No. 1 electric conveyor belt; Beneficial Effects

[0012] 1. In the present invention, during the feeding process, the bolts poured into the storage hopper together are vibrated and dispersed by means of vibration feeding, so as to avoid the bolts piling up and blocking the feeding port, and to keep the bolts uniformly fed during the feeding process. When the bolts pass through a plurality of cross bars arranged side by side, the zinc sheet on the bolts falls from the grid gap formed by two adjacent cross bars to the collecting hopper for collection, so as to avoid the situation that the zinc sheet or other sundries are counted and cause counting errors when the bolts are photographed and counted by the CCD camera and weighed and checked by the electronic scale; 2. In addition, before use, the gap between two adjacent cross bars can be increased or decreased by controlling the two push plates in the adjustment part to move inward or outward, and cooperating with the No. 1 spring, so that the gap between adjacent cross bars can be flexibly changed, which can reasonably cope with most bolts of different diameters and prevent smaller bolts from falling out of the gap; 3. The vibration motor in the vibration part will generate vibration force when it is started. The vibration force will be transmitted to the longitudinal rod and the cross rod through the side plate in the adjustment part. The No. 1 spring in the grille part will make the cross rod shake slightly back and forth to generate vibration force. The vibration force of the cross rod will accelerate the falling of the zinc sheet or other attached debris on the bolt, thereby improving the efficiency of removing the zinc sheet or other attached debris. 4. At the same time, the vibration force of the cross bar can accelerate the rolling of the bolts, prevent the bolts from being stuck in the gap, and avoid the bolts from being blocked during the zinc removal process of the cross bar; it can also disperse the vibration of the bolts on the No. 2 electric conveyor belt, which is beneficial to the CCD camera counting. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a structural schematic diagram of the present invention; Figure 2 A schematic diagram of the grille member of the present invention; Figure 3 Schematic diagram of the adjustment member of the present invention; Figure 4 It is a schematic diagram of a vibrating member of the present invention; Figure 5 It is a schematic diagram of the connection between the grille member, the adjustment member and the vibration member of the present invention; Figure 6 A schematic diagram of a package of the present invention; Figure 7 A schematic diagram of a card board of the present invention; Figure 8 It is a front view schematic diagram of the present invention; Fig. 9 For the present invention Figure 6 Enlarged schematic diagram at point a in the middle.

[0014] Among them, 1. No. 1 electric conveyor belt; 2. Storage hopper; 21. Unloading plate; 22. No. 3 spring; 3. Electronic scale; 4. Grille; 41. Crossbar; 42. No. 1 spring; 43. Longitudinal bar; 44. Baffle; 5. Packing piece; 51. Card plate; 52. Packing bag; 53. Fixed rod; 54. Arc groove; 55. Bump; 56. Elastic band; 6. Adjustment piece; 61. Push block; 62. Slope; 63. Side plate; 64. Push plate; 65. Servo motor; 66. Bidirectional screw; 7. Vibration piece; 71. Vibration motor; 72. Connecting frame; 73. Pin rod; 74. No. 2 spring; 75. Ear block; 8. Collecting hopper; 9. No. 2 electric conveyor belt; 10. No. 3 electric conveyor belt; 11. Control board; 12. CCD camera. DETAILED DESCRIPTION

[0015] The invention of this application is further described in detail below in conjunction with the accompanying drawings and specific embodiments. In order to clearly and completely describe the technical solution, the following embodiments are selected for illustration; based on the contents recorded in this application, other embodiments obtained without creative work are all within the scope of protection of the present invention.

[0016] In the following embodiments, it should be noted that the terms "upper", "lower", "left", "right", "inside", "outside", "top / bottom" and other orientations or positional relationships are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of clearly describing the present embodiment, rather than indicating or implying that the device or element referred to must have a specific orientation, and therefore cannot be understood as a limitation on the present application.

[0017] like Figures 1 to 9As shown, an embodiment of the present invention provides an automatic weighing and packaging device for bolts, including a No. 1 electric conveyor belt 1 for transferring bolts, a storage hopper 2 for storing bolts is arranged at one end of the No. 1 electric conveyor belt 1, an electronic scale 3 and a CCD camera 12 fixed on the rear side of the electronic scale 3 are arranged at the other end of the No. 1 electric conveyor belt 1, which can determine the weight of the bolts by photographing the number of bolts, and a grid member 4 and an adjustment member 6 are arranged between the electronic scale 3 and the No. 1 electric conveyor belt 1; the grid member 4 includes a longitudinal rod 43 and a cross rod 41 that is elastic and movable on the longitudinal rod 43 and arranged side by side; the adjustment member 6 includes a movably arranged push block 61 and a part of the push block 61 is located between two adjacent cross rods 41 for pushing the cross rod 41 to move. The gap between two adjacent cross rods 41 can be changed in the range of 0.5-4cm; As preferably, Figure 1 As shown, the No. 1 electric conveyor belt 1 is divided into several drawers by a baffle. When the bolts of a single drawer fall onto the grid member 4, an effect of falling at intervals is formed, so that subsequent photo counting is more accurate.

[0018] When choosing a CCD camera 12, pay attention to the frame rate, definition and importance: Frame rate refers to the number of image frames that a camera can capture in one second. The higher the frame rate, the smoother the dynamic picture captured. In scenes where high-speed moving objects are shot, such as sports event shooting, high-speed production line inspection, etc., a high frame rate is very critical. For example, when shooting a bullet flying at high speed, a high-frame-rate CCD camera 12 is required to clearly capture every moment of the bolt's movement, otherwise the picture will appear blurry or jumpy. Selection suggestion: Choose a suitable frame rate according to the movement speed of the subject. For shooting static objects or slow-moving objects, a lower frame rate (such as 15 - 30 frames / second) may be sufficient. However, if you want to shoot fast-moving objects, such as racing competitions, fast-moving parts on automated production lines, etc., you need to choose a high-frame-rate camera, which may require a frame rate of 60 frames / second or even higher to ensure that the object's movement process can be fully and clearly recorded; At the same time, the CCD camera 12 should also be noted that if you often need to work in low-light conditions, you should choose a CCD camera 12 with high sensitivity and effective noise control. You can check the camera's technical parameters and evaluation reports to understand the noise performance at different ISO values. Although some cameras can capture brighter images at high ISO settings, noise will seriously reduce the image quality. Cameras with better performance can use built-in noise reduction technology to increase sensitivity while maintaining relatively good bolt image quality.

[0019] refer to Figure 1A vibrating member 7 and a collecting hopper 8 are provided below the cross bar 41, and a No. 2 electric conveyor belt 9 is provided between the cross bar 41 and the electronic scale 3; a No. 3 electric conveyor belt 10 is provided at one end of the No. 1 electric conveyor belt 1, and the No. 3 electric conveyor belt 10 is located below the outlet end of the electronic scale 3, and a control panel 11 is provided on one side of the No. 3 electric conveyor belt 10 for controlling the electrical components of the device and receiving the image transmitted by the CCD camera to calculate the weight of the delivered bolts through the data, and a packaging piece 5 is provided at one end of the No. 3 electric conveyor belt 10.

[0020] refer to Figure 2 and Figure 5 The rear end of the longitudinal rod 43 is welded to a cross bar 41 at the front side and then passes through a plurality of cross bars 41 with variable spacing, but the cross bar 41 at the front side does not slide on the longitudinal rod 43. A spring 42 is arranged between two adjacent cross bars 41, and the spring 42 is sleeved on the periphery of the longitudinal rod 43; one end of the spring 42 is welded to the outer surface of the longitudinal rod 43 and the other end of the spring 42 is welded to the cross bar 41; refer to Figure 5 The electronic scale 3 is a prior art, and the electronic scale 3 can be selected to have an automatic unloading function; one end of each cross bar 41 close to the electronic scale 3 is tilted downward to force the bolts to roll down, and the upper surfaces of the two cross bars 41 located at the front and rear sides are integrally provided with baffles 44 to prevent the bolts from falling. Side plates 63 are fixed at both ends of the longitudinal rod 43, and a push plate 64 is slidably arranged between the two side plates 63. Push blocks 61 are fixed on the inner sides of the two push plates 64 to drive the push blocks 61 to move; a servo motor 65 is arranged on one side of one push plate 64, and the servo motor 65 can be fixed to the side plate 63 through the mounting frame, and a bidirectional screw 66 is fixed to the output end of the servo motor 65, and the bidirectional screw 66 is threadedly arranged with the two push plates 64; a slope 62 of 10-30 degrees is arranged on one side of each push block 61, and the slope 62 is tightly pressed against the outer surface of the cross bar 41.

[0021] refer to Figure 4 and Figure 5 as well as Figure 8, a vibrating member 7 is provided at one end of the No. 1 electric conveyor belt 1, and the vibrating member 7 includes a vibration motor 71 and a connecting frame 72, and the vibration motor 71 is fixed on the upper surface of the connecting frame 72; a pin rod 73 is integrally provided on the lower surface of the connecting frame 72, and a No. 2 spring 74 is sleeved on the outer periphery of the pin rod 73 to increase the vibration effect and install the ear block 75 of the adjustment member 6 and the grid member 4, and one end of each ear block 75 is fixed to the side plate 63, one end of the No. 2 spring 74 is welded to the lower surface of the ear block 75, and the other end of the No. 2 spring 74 is welded to the pull of the pin rod 73; the collecting hopper 8 is fixed to the lower surface of the side plate 63, and one end of the side plate 63 is connected to the No. 2 electric conveyor belt 9, and one end of the No. 2 electric conveyor belt 9 is fixed to the electronic scale 3. After the vibration motor 71 is started, the ear block 75 will slide back and forth on the pin rod 73, and at the same time compress or pull the No. 2 spring 74 to increase the vibration force; refer to Figure 6 , Figure 7 , Fig. 9 The packing piece 5 includes a cardboard 51 and a packing bag 52. The packing bag 52 is clamped on the outer periphery of the cardboard 51. A fixing rod 53 is welded to one end of the No. 3 electric conveyor belt 10, and one end of the fixing rod 53 is fixed to the lower surface of the cardboard 51. The cardboard 51 is semicircular and the open end of the cardboard 51 is away from the No. 3 electric conveyor belt 10 for easy transfer of the packing bag 52. An arc groove 54 is provided in the cardboard 51, and a protrusion 55 is integrally provided on the top wall of the arc groove 54. The protrusion 55 can be a nail or a cylinder, or a hook; an elastic band 56 is passed through the opening of the packing bag 52. After the packing bag 52 is sleeved on the cardboard 51, the elastic band 56 is clamped in the arc groove 54 and the elastic band 56 is hooked with the protrusion 55; refer to Figure 8 A No. 3 spring 22 is welded to the lower surface of the storage hopper 2, and a feed plate 21 is welded to the lower end of the No. 3 spring 22. The feed plate 21 is located above the No. 1 electric conveyor belt 1. The cross-section of the feed plate 21 is U-shaped and is inclined toward the No. 1 electric conveyor belt 1. At the same time, a vibration motor 71 is fixed to the lower surface of the feed plate 21 to vibrate the bolts to make the bolts loaded evenly. Because a large number of bolts are poured in, vibration loading prevents the bolts from piling up and blocking the loading port. In addition, due to the use of vibration loading, after the bolts fall from the feed plate 21 into a single drawer, the single drawer will not be filled up. When the bolts of a single drawer fall onto the grille member 4, an effect of interval falling is formed, thereby making the subsequent photo counting more accurate.

[0022] Working principle: When using this equipment, first inject the bolts into the storage hopper 2, the bolts will fall onto the No. 1 electric conveyor belt 1 and be transported to the grid member 4, and are on several cross bars 41 arranged side by side. When the bolts pass through several cross bars 41 arranged side by side, the zinc sheet on the bolts falls from the grid gap formed by two adjacent cross bars 41 to the collecting hopper 8 for collection, which can avoid the situation where the zinc sheet or other debris is included in the counting error when the bolts are photographed and counted by the CCD camera 12 and weighed and checked by the electronic scale 3. Finally, after the bolts are weighed and checked by the electronic scale 3, the bolts will fall from the discharge port of the electronic scale 3 onto the No. 3 electric conveyor belt 10 and be transported to the packing bag 52 in the packing piece 5.

[0023] In addition, before use, the servo motor 65 in the adjusting member 6 can be started to drive the bidirectional screw 66 to rotate clockwise to make the two push plates 64 move inwardly. When the two push plates 64 move inwardly, they will push a number of push blocks 61 to move accordingly, and the ramp 62 will push the cross bar 41 tightly. As the push block 61 continues to push, the lowest end of the ramp 62 pushes the cross bar 41 tightly and will gradually press against the high end of the ramp 62, thereby pushing the cross bar 41 to move backward and increasing the gap between the two adjacent cross bars 41; when the cross bar 41 moves backward, it will pull the No. 1 spring 42 to make the No. 1 spring 42 produce a rebound force, and when the servo motor 65 is controlled to drive the bidirectional screw 66 to rotate counterclockwise, the push block 61 will gradually move outward, and the No. 1 spring 42 will pull the cross bar 41 back to gradually return to its position, so that the gap between the adjacent cross bars 41 will gradually become smaller, so that it can be flexibly changed, and the gap between the adjacent cross bars 41 can reasonably cope with most bolts of different diameters, and can prevent smaller bolts from falling through the gap; In addition, the vibration motor 71 in the vibration member 7 on the front and rear sides of the cross bar 41 generates vibration force when it is started, and the vibration force is transmitted to the longitudinal bar 43 and the cross bar 41 through the side plate 63 in the adjustment member 6. The cross bar 41 is slightly shaken back and forth by the No. 1 spring 42 in the grille member 4 to generate vibration force. The vibration force of the cross bar 41 accelerates the falling of the zinc sheet or other attached sundries on the bolt, thereby improving the efficiency of removing the zinc sheet or other attached sundries. At the same time, the vibration force of the cross bar 41 can accelerate the rolling of the bolts, prevent the bolts from being stuck in the gap, and avoid the bolts from being blocked during the zinc removal process of the cross bar 41; At the same time, the vibration force is also transmitted to the No. 2 electric conveyor belt 9 through the side plate 63. In the process of the No. 2 electric conveyor belt 9 conveying the bolts to the electronic scale 3, the bolts can be vibrated and dispersed, which is beneficial to the counting of the CCD camera 12; at the same time, the speed of the bolts falling can be reduced to facilitate the fine adjustment of the weight of the bolts with the electronic scale 3; When the packing bag 52 is in use, the bag opening can be placed on the cardboard 51, and the elastic band 56 at the bag opening of the packing bag 52 will be in the arc groove 54 and hooked by the protrusion 55, which can increase the stability of the packing bag 52 when the bolts are injected. At the same time, when the packing bag 52 is transferred, the elastic band 56 will automatically tighten to prevent the bolts from falling out of the packing bag 52.

[0024] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any slight modification, equivalent substitution and improvement made to the above embodiment based on the technical essence of the present invention should be included in the protection scope of the technical solution of the present invention.

Claims

1. A bolt automatic weighing and packaging device, comprising a No. 1 electric conveyor belt (1), one end of the No. 1 electric conveyor belt (1) is provided with a storage hopper (2), and the other end of the No. 1 electric conveyor belt (1) is provided with an electronic scale (3) and a CCD camera (12), characterized in that: A grid member (4) and an adjusting member (6) are provided between the electronic scale (3) and the first electric conveyor belt (1); The grille member (4) comprises a longitudinal rod (43) and a transverse rod (41) which is elastic and can move on the longitudinal rod (43) and is arranged side by side; The adjusting member (6) comprises a movably arranged push block (61), and a portion of the push block (61) is located between two adjacent cross bars (41) for pushing the cross bars (41) to move.

2. The bolt automatic weighing and packaging device according to claim 1 is characterized in that: A vibrating member (7) and a collecting hopper (8) are provided below the crossbar (41), and a second electric conveyor belt (9) is provided between the crossbar (41) and the electronic scale (3); A No. 3 electric conveyor belt (10) is arranged at one end of the No. 1 electric conveyor belt (1), the No. 3 electric conveyor belt (10) is located below the outlet end of the electronic scale (3), a control panel (11) is arranged on one side of the No. 3 electric conveyor belt (10), and a packaging piece (5) is arranged at one end of the No. 3 electric conveyor belt (10).

3. The bolt automatic weighing and packaging device according to claim 2 is characterized in that: The rear end of the longitudinal rod (43) is welded to a frontmost cross rod (41) and then passes through a plurality of cross rods (41); a first spring (42) is arranged between two adjacent cross rods (41); and the first spring (42) is sleeved around the periphery of the longitudinal rod (43); One end of the first spring (42) is welded to the outer surface of the longitudinal rod (43), and the other end of the first spring (42) is welded to the cross rod (41); One end of each cross bar (41) close to the electronic scale (3) is arranged to be tilted downward, and a baffle (44) is integrally provided on the upper surfaces of the two cross bars (41) located at the front and rear sides.

4. The bolt automatic weighing and packaging device according to claim 3 is characterized in that: Side plates (63) are fixed at both ends of the longitudinal rod (43), a push plate (64) is slidably arranged between the two side plates (63), and push blocks (61) are fixed on the inner sides of the two push plates (64) for driving the push blocks (61) to move; A servo motor (65) is disposed on one side of one of the push plates (64), a bidirectional screw (66) is fixed to the output end of the servo motor (65), and the bidirectional screw (66) is threadedly disposed with the two push plates (64); A slope (62) is provided on one side of each push block (61), and the slope (62) is tightly pressed against the outer surface of the cross bar (41).

5. The bolt automatic weighing and packaging device according to claim 4 is characterized in that: A vibrating member (7) is provided at one end of the first electric conveyor belt (1), wherein the vibrating member (7) comprises a vibrating motor (71) and a connecting frame (72), and the vibrating motor (71) is fixed on the upper surface of the connecting frame (72); A pin rod (73) is integrally provided on the lower surface of the connecting frame (72), and a second spring (74) and an ear block (75) are sleeved on the outer periphery of the pin rod (73), one end of each ear block (75) is fixed to the side plate (63), one end of the second spring (74) is welded to the lower surface of the ear block (75), and the other end of the second spring (74) is welded to the pull of the pin rod (73); The collecting hopper (8) is fixed on the lower surface of the side plate (63), one end of the side plate (63) is connected to the No. 2 electric conveyor belt (9), and one end of the No. 2 electric conveyor belt (9) is fixed to the electronic scale (3).

6. The bolt automatic weighing and packaging device according to claim 2 is characterized in that: The packaging piece (5) comprises a cardboard (51) and a packaging bag (52), the packaging bag (52) being clamped on the periphery of the cardboard (51), a fixing rod (53) being welded to one end of the No. 3 electric conveyor belt (10), and one end of the fixing rod (53) being fixed to the lower surface of the cardboard (51).

7. The bolt automatic weighing and packaging device according to claim 6 is characterized in that: The card plate (51) is semicircular in shape and the open end of the card plate (51) is away from the third electric conveyor belt (10). An arc-shaped groove (54) is provided in the card plate (51), and a protrusion (55) is integrally provided on the top wall of the arc-shaped groove (54).

8. The bolt automatic weighing and packaging device according to claim 7 is characterized in that: An elastic band (56) is inserted into the opening of the packing bag (52). After the packing bag (52) is sleeved on the clamping plate (51), the elastic band (56) is clamped in the arc groove (54) and the elastic band (56) is hooked with the protrusion (55).

9. The bolt automatic weighing and packaging device according to claim 1 is characterized in that: A No. 3 spring (22) is welded to the lower surface of the storage hopper (2), and a feed plate (21) is welded to the lower end of the No. 3 spring (22), wherein the feed plate (21) is located above the No. 1 electric conveyor belt (1).

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