Counting device for paper bag packaging equipment

Abstract

The utility model relates to a counting device for paper bag packaging equipment, which comprises a conveying frame, a counting device and a counting device, the feeding mechanism can act on the cover body located in the conveying channel and convey the cover body forwards along the conveying channel; the counting unit comprises a screw rod assembly and a screw rod driving mechanism, the screw rod assembly comprises two screw rods which are arranged at an interval, the peripheral walls of the two screw rods are provided with spiral grooves for the peripheral edges of the cover bodies to be limited therein, and the screw rod driving mechanism is in transmission connection with the two screw rods so as to drive the two screw rods to rotate synchronously; the spiral grooves of the two screw rods are configured to allow only one cover body to pass between the two screw rods in the process that the two screw rods rotate by one circle; the counting unit further comprises a rotary encoder which is used for directly or indirectly measuring the number of rotation turns of one screw so as to count the cover body passing through the gap between the two screws. The device has the advantages that the cover body conveying counting efficiency is high, and the abrasion problem is not prone to occurring.

Description

TECHNICAL FIELD

[0001] The utility model relates to paper bag packaging equipment technical field especially, a kind of counting device for paper bag packaging equipment. BACKGROUND

[0002] Many foods on the existing market are filled with metal cans, which are configured with thin covers (also known as "thin covers") on the can mouths. In order to reduce the pollution of such covers during transportation, a certain number of covers need to be stacked tightly and stacked to form a cylinder after being processed, and then transported to a paper bag packaging equipment for packaging with paper bags on the paper bag packaging equipment. The counting and conveying device of the cover is connected between the outlet end of the cover processing equipment and the inlet end of the paper bag packaging equipment, counts the produced covers, and sends a certain number of covers as a packaging unit into the paper bag packaging equipment for subsequent packaging operations.

[0003] For example, a Chinese utility model patent application with application number CN202322600194.6 (authorized announcement number: CN221234197U) discloses a counting and conveying device for covers, which includes a conveying part and a counting part of the cover. The conveying part includes a front conveying part, a rear conveying part connected to the counting part, and an intermediate conveying part arranged obliquely between the front conveying part and the counting part. The front end of the intermediate conveying part is connected to the end of the front conveying part, and the rear end of the intermediate conveying part is located above the counting part. The intermediate conveying part can transport the upright covers sent by the front conveying part in a flat state and convert them into an upright state to fall into the counting part. The counting part separates and counts the covers from the intermediate conveying part one by one and then transfers them to the rear conveying part for quantitative conveying. The counting part can include two screws installed below the rear end of the magnetic support plate on both sides, a second driving member for driving the two screws to rotate synchronously, and a counter for counting the covers between the two screws. The screw grooves on the two screws have opposite spiral directions, and the slot openings formed in the radial direction of the screw grooves on the two screws correspond to each other to form a limiting opening with an axial width greater than the thickness of the cover. One of the limiting openings corresponds to the lower end of the cover falling groove, so that the upright cover falling from the lower end of the cover falling groove is inserted into the limiting opening.

[0004] However, the counting conveying device of the cover body in the above patent application still has some deficiencies: the cover body is conveyed forward through the spiral groove formed on the screw, and is counted through a conventional counter (such as an infrared sensor) during the conveying process. In order to ensure that the cover body can be effectively separated during the conveying process to achieve accurate counting, the axial size of the spiral groove on the screw needs to be relatively large, that is, the spiral groove is arranged on the screw with a relatively large number of turns. Therefore, each cover body must pass through the spiral groove of the screw for a relatively long time before it can be separated from the spiral groove of the screw, resulting in a relatively long time spent in the counting and conveying process of the cover body, low counting and conveying efficiency, and especially, the cover body is prone to scratches or edge crushing during the conveying process, thereby causing the cover body to be scrapped.

[0005] Therefore, the existing counting device for paper bag packaging equipment still needs to be further improved. Content of the utility model

[0006] The technical problem to be solved by the utility model is to provide a counting device for paper bag packaging equipment, which has high cover body conveying and counting efficiency and is not prone to wear.

[0007] The utility model adopts the technical scheme that a counting device for paper bag packaging equipment comprises:

[0008] The conveying frame has a conveying channel for stacking and conveying the cover bodies forward.

[0009] The feeding mechanism is arranged on one side of the conveying frame and can act on the cover bodies in the conveying channel and convey the cover bodies forward along the conveying channel.

[0010] The counting unit comprises a screw assembly and a screw driving mechanism. The screw assembly comprises two screws arranged at intervals and allowing the cover bodies to pass through the gap therebetween. Spiral grooves are formed on the outer peripheral walls of the two screws to limit the outer peripheral edges of the cover bodies. The screw driving mechanism is connected in transmission with the two screws, thereby synchronously rotating the two screws.

[0011] The spiral grooves of the two screws are configured to allow only one cover body to pass through the gap between the two screws during one rotation of the two screws.

[0012] The counting unit further comprises a rotary encoder for directly or indirectly measuring the number of rotations of one of the screws to count the cover bodies passing through the gap between the two screws.

[0013] The screw driving mechanism in the above-mentioned "screw driving mechanism connected with two screw transmissions" can be a driving motor, and the "connected with transmission" can be achieved by a belt transmission assembly, a gear transmission assembly, or a chain transmission assembly.

[0014] In order to allow only one cover to pass between the two screws during one rotation of the two screws, the rotation angle of the spiral groove on the screw needs to be reasonably designed. Specifically, the rotation groove on the screw has a groove inlet for the outer peripheral edge of the cover to enter the rotation groove and a groove outlet for the cover located in the rotation groove to move out. The included angle formed by the positions of the groove inlet and the groove outlet of the rotation groove relative to the central axis of the screw in the circumferential direction is denoted as α, where 60° < α < 120°. The structural design of the above-mentioned spiral groove ensures that the previous cover has moved out of the groove outlet of the spiral groove when the next cover just enters the groove inlet of the spiral groove of the screw. Therefore, it can be ensured that only one cover passes between the two screws during one rotation of the two screws, and the accuracy of cover counting detection is improved.

[0015] In order to facilitate the installation of the screw and drive the above-mentioned two screws to rotate synchronously, a vertical plate is further included. Both of the two screws are rotatably arranged on the vertical plate. The screw driving mechanism includes a screw driving motor and two belt transmission assemblies connected with the output shaft of the screw driving motor. The two belt transmission assemblies are respectively corresponding to the two screws. Each belt transmission assembly includes at least two first pulleys rotatably arranged on the vertical plate and a first transmission belt wound between the corresponding two first pulleys. The vertical plate further includes two second pulleys coaxially connected with the two screws, respectively. A second transmission belt is wound between one of the first pulleys of the belt transmission assembly and the second pulley.

[0016] In order to facilitate the installation of the second pulley and the screw and ensure the stability of their rotation after installation on the vertical plate, the second pulley and the screw are connected through a connecting shaft rotatably arranged on the vertical plate. The second pulley and the screw are located on the front and rear sides of the vertical plate, respectively.

[0017] Generally, the rotation axis of the rotary encoder can be directly connected with the screw through a coupling or connected with the first pulley of the belt transmission assembly. Both of the above can directly or indirectly measure the rotation number of one of the screws and achieve the purpose of counting the covers passing between the two screws. Preferably, the vertical plate further includes a fixing bracket for fixing the rotary encoder. The fixing bracket is arranged adjacent to one of the first pulleys of the belt transmission assembly, and the rotation axis of the rotary encoder is connected with the first pulley through a coupling.

[0018] In order to ensure that the cover is always in close contact during the process of conveying forward in the conveying channel, and to ensure the accuracy of the cover counting, the conveying channel comprises a first channel section, an intermediate channel section and a second channel section connected in sequence, the first channel section is horizontally extended or gradually inclined downward from back to front, the intermediate channel section is vertically extended, and the second channel section is horizontally extended or gradually inclined upward from back to front.

[0019] As an improvement, two screws are arranged at the position of the end outlet of the second channel section. In the preferred embodiment, the second channel section is designed to gradually incline upward from back to front, so that the cover is always in close contact during the process of conveying forward in the conveying channel. On this basis, arranging two screws at the end outlet of the second channel section can ensure that the cover can pass through the two screws in sequence, and there is no problem of missing or subsequent cover catching up.

[0020] In order to ensure that the cover can pass stably during counting, the two screws are arranged vertically, the end outlet of the second channel section is provided with arc-shaped limiting plates arranged oppositely, the notches of the two arc-shaped limiting plates are opposite to each other to define a counting channel connected with the conveying channel, and the two arc-shaped limiting plates are provided with accommodation notches for the corresponding screws to extend into the counting channel.

[0021] In order to ensure that the cover can be conveyed stably forward along the conveying channel, the feeding mechanism comprises a feeding driving motor and a feeding wheel driven to rotate by the feeding driving motor, the feeding wheel has two, and the two feeding wheels are arranged on both sides of the intermediate channel section to drive the cover in the intermediate channel section to convey downward.

[0022] In order to simplify the structure of the conveying frame, the conveying frame comprises at least three limiting ribs arranged in sequence along the circumference of the cover, and the internal space defined by each limiting rib constitutes the conveying channel. The conveying channel formed by the limiting ribs also corresponds to the reserved notches, so that the feeding mechanism outside the conveying channel can act on the cover in the conveying channel to make the cover convey forward.

[0023] In view of the fact that the number of caps passing between the two screws is counted by directly or indirectly measuring the number of rotations of one of the screws by the rotary encoder, the problem of inaccurate counting caused by the caps not being conveyed in place can occur, and as an improvement, an infrared sensor for detecting the number of caps passing between the two screws is further included. The rotary encoder can have the problem of pulse loss or inaccurate counting under the condition of high-speed rotation or the presence of mechanical vibration. The infrared sensor can serve as an auxiliary counting means to check and supplement the counting of the rotary encoder. The infrared sensor can detect the number of times the caps pass, and timely discover and correct the counting error of the rotary encoder.

[0024] Compared with the prior art, the advantages of the utility model are: the caps are conveyed forward by the synchronously rotating screws, wherein the helical grooves of the two screws are all constructed to only allow one cap to pass between the two screws during one rotation of the two screws, and on this basis, the number of caps passing between the two screws is counted by directly or indirectly measuring the number of rotations of one of the screws by the rotary encoder, the above-mentioned structure design enables each cap to quickly separate from the helical groove of the screw after entering the helical groove of the screw, greatly shortens the counting time of the caps, improves the counting and conveying efficiency, and on the other hand, since the time of each cap conveyed by the screw is shortened, the problem of the caps being scratched or squeezed during the conveying process is also effectively avoided. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 It is a perspective view of the paper bag packaging equipment of the embodiment of the utility model;

[0026] Figure 2 It is a front view of the paper bag packaging equipment of the embodiment of the utility model;

[0027] Figure 3 It is a perspective view of the counting device of the paper bag packaging equipment of the embodiment of the utility model;

[0028] Figure 4 It is a perspective view of the counting unit of the embodiment of the utility model;

[0029] Figure 5 It is a perspective view of the counting unit of the embodiment of the utility model from another angle;

[0030] Figure 6 It is a perspective view of the screw assembly of the embodiment of the utility model;

[0031] Figure 7 It is a perspective view of the screw assembly of the embodiment of the utility model from another angle;

[0032] Figure 8 It is the front view of the screw assembly of the utility model embodiment.

[0033] Figure 9 It is the left view of the screw assembly of the screw assembly of the utility model embodiment. DETAILED DESCRIPTION

[0034] The utility model will be further described in detail below in combination with the embodiment of the drawings.

[0035] In the description and claims of the utility model, terms indicating directions, such as 'front', 'back', 'up', 'down', 'left', 'right','side', 'top', 'bottom' and the like, are used to describe various example structural parts and elements of the utility model, but these terms are used herein only for the purpose of convenient description, and are determined based on the example orientation shown in the drawings. Since the disclosed embodiments of the utility model can be arranged in different directions, these terms indicating directions are only used for description and should not be regarded as limitation, for example, 'up' and 'down' are not necessarily limited to the direction opposite or consistent with the direction of gravity.

[0036] Figures 1-9 A preferred embodiment of the paper bag packaging equipment and the counting device for the paper bag packaging equipment of the utility model is shown. The paper bag packaging equipment generally includes a counting device, a feeding device, a packaging device and a material collecting device, etc., wherein the counting device is used to quantitatively count the cover b in the feeding process, and the stack of cover b after counting is completed is pushed to the position where the packaging position is located through the feeding device, the packaging device is used to send the stacked cover b to the paper bag located in the packaging position, and the paper bag is sealed and packaged, and the paper bag after the sealing and packaging is completed is discharged through the material collecting mechanism. Among them, the feeding device, the packaging device and the material collecting device of the paper bag packaging equipment can adopt the prior art, such as the corresponding device or equipment in the Chinese invention patent application 'Paper Bag Packaging Machine' with the application number CN202011593099.2 (authorized announcement number: CN112660496B), which will not be described in detail. The structure and working process of the counting device of the paper bag packaging equipment are described in detail below.

[0037] Referring to Figures 2-5 , the counting device of the paper bag packaging equipment includes a conveying frame 2, a feeding mechanism 22 and a counting unit.

[0038] The conveying frame 2 has a conveying channel 200 in which the cover bodies b are stacked and conveyed forward. The "forward" in the conveying channel 200 refers to the side adjacent to the outlet of the conveying channel 200 in the extending direction of the conveying channel 200, which is not limited to the conventional "forward-backward direction". For example, when a section of the conveying channel 200 extends vertically and the cover bodies b move downward from top to bottom, the "forward conveying" refers to downward conveying.

[0039] The feeding mechanism 22 is arranged on one side of the conveying frame 2 and can act on the cover bodies b in the conveying channel 200 to convey the cover bodies b forward along the conveying channel 200. Specifically, the feeding mechanism 22 includes a feeding drive motor 221 and feeding wheels 222 driven to rotate by the feeding drive motor 221. The feeding wheels 222 are two, arranged on both sides of the conveying channel 200 and in contact with the outer peripheral edges of the stacked cover bodies b in the conveying channel 200, which can drive the cover bodies b to convey forward when the feeding wheels 222 rotate. The feeding drive motor 221 can drive the two feeding wheels 222 to rotate through a gear transmission assembly, a belt transmission assembly 33 or a chain transmission assembly, wherein the rotation directions of the feeding wheels 222 arranged on both sides of the conveying channel 200 are opposite.

[0040] Referring to Figure 2 The conveying channel 200 of the conveying frame 2 includes a first channel section 201, an intermediate channel section 202 and a second channel section 203 connected in sequence. The first channel section 201 extends horizontally or gradually inclines downward from back to front, and preferably has a structure designed to gradually incline upward from back to front. The intermediate channel section 202 extends vertically, and the cover bodies b are automatically stacked together under the action of their own gravity after being conveyed to the intermediate channel section 202. The second channel section 203 extends horizontally or gradually inclines upward from back to front, and preferably has a structure designed to gradually incline upward from back to front.

[0041] The two feeding wheels 222 of the feeding device are arranged on both sides of the intermediate channel section 202, which can drive the cover bodies b in the intermediate channel section 202 to convey downward. Since the cover bodies b in the intermediate channel section 202 are vertically stacked and always in close contact, when the feeding drive motor 221 drives the feeding wheels 222 to rotate, it can continuously apply a downward pushing force to the cover bodies b, ensuring the stability of the cover bodies b feeding and the accuracy of the cover bodies b counting.

[0042] In order to simplify the structure of the conveying frame 2, the conveying frame 2 includes at least three limiting ribs 20 arranged in sequence along the circumference of the cover bodies b, as shown in Figure 3As shown, four limiting ribs 20 are shown, and the internal space defined by the four limiting ribs 20 constitutes the conveying channel 200. The conveying channel 200 defined by the limiting ribs also has a corresponding gap reserved for the feeding mechanism 22 outside the conveying channel 200 to act on the cover b in the conveying channel 200, so that the cover b is conveyed forward. In the curved conveying channel 200, each limiting rib 20 is also designed as a corresponding curved structure.

[0043] Referring to Figure 4 and Figure 5 , the paper bag packaging equipment comprises a rack 10, and a vertical plate 11 is arranged on the rack 10. The vertical plate 11 is provided with a through hole for the cover b to pass through. The end portions of the four limiting ribs 20 are connected to the outer peripheral edge of the through hole.

[0044] Referring to Figures 4-9 , the counting unit comprises a screw rod assembly, a screw rod driving mechanism, and a rotary encoder 13. The screw rod assembly comprises two screw rods 3 arranged at intervals and allowing the cover b to pass through the gap between the two screw rods 3. The screw rod driving mechanism is in transmission connection with the two screw rods 3, so as to drive the two screw rods 3 to rotate synchronously. The outer peripheral wall of each of the two screw rods 3 is provided with a helical groove for limiting the outer peripheral edge of the cover b. The helical grooves of the two screw rods 3 are configured such that only one cover b can pass through the gap between the two screw rods 3 during one rotation of the two screw rods 3. Specifically, the rotary groove 30 on the screw rod 3 has a groove inlet 301 for the outer peripheral edge of the cover b to enter the rotary groove 30 and a groove outlet 302 for the cover b in the rotary groove 30 to move out. The included angle formed by the positions of the groove inlet 301 and the groove outlet 302 relative to the central axis of the screw rod 3 is denoted as α, where 60° < α < 120°, as shown in Figure 8 . The helical groove is designed in the above structure, so that when the next cover b just enters the groove inlet 301 of the helical groove of the screw rod 3, the previous cover b has already moved out of the groove outlet 302 of the helical groove. Therefore, only one cover b can pass through the gap between the two screw rods 3 during one rotation of the two screw rods 3, which improves the accuracy of counting and detecting the cover b. The rotary encoder 13 can count the cover b passing through the gap between the two screw rods 3 by directly or indirectly measuring the number of rotations of one of the screw rods 3.

[0045] The two screws 3 are rotatably arranged on the vertical plate 11. The screw driving mechanism comprises a screw driving motor 32 and two belt driving assemblies 33 connected with the output shaft of the screw driving motor 32. Each of the two belt driving assemblies 33 corresponds to one of the two screws 3. Specifically, each of the belt driving assemblies 33 comprises at least two first pulleys 331 rotatably arranged on the vertical plate 11 and a first transmission belt 333 arranged between the corresponding two first pulleys 331. The vertical plate 11 is further provided with two second pulleys 332 coaxially connected with the two screws 3 respectively, and a second transmission belt 333 is arranged between one of the first pulleys 331 of the belt driving assembly 33 and the second pulley 332. The second pulley 332 and the screw 3 are connected through a connecting shaft 31 rotatably arranged on the vertical plate 11, and the second pulley 332 and the screw 3 are located on the front and rear sides of the vertical plate 11 respectively.

[0046] Generally, the rotation axis of the rotary encoder 13 can be directly connected with the screw 3 through the coupling 131, or can be connected with the first pulley 331 of the belt driving assembly 33. Both of the above can realize direct or indirect measurement of the rotation number of one of the screws 3, and thus achieve the purpose of counting the cover b passing through the gap between the two screws 3, see Figure 5 In the preferred embodiment, the vertical plate 11 is further provided with a fixing bracket 12 for fixing the rotary encoder 13, and the fixing bracket 12 is arranged adjacent to one of the first pulleys 331 of the belt driving assembly 33, wherein the rotation axis of the rotary encoder 13 is connected with the first pulley 331 through the coupling 131. The outer diameter of the first pulley 331 and the outer diameter of the second pulley 332 are preferably designed to be equal in diameter, so that the rotation number of the first pulley 331 is the same as that of the second pulley 332. Of course, the first pulley 331 and the second pulley 332 can also be designed to be non-equal in diameter, and the rotation angle or number between the two can be obtained through corresponding proportional conversion.

[0047] The two screws 3 are arranged at the position of the outlet of the second channel segment 203. In some embodiments, the two screws 3 are arranged in an up-down interval, and correspondingly, the outlet of the second channel segment 203 is provided with two arc-shaped limiting plates 21 arranged oppositely in up-down direction, and the concave parts of the two arc-shaped limiting plates 21 are opposite to each other to define a counting channel 211 connected with the conveying channel 200. The two arc-shaped limiting plates 21 are provided with a gap 210, and the parts of the two screws 3 can correspondingly extend into the counting channel 211 to realize conveying of the cover b in the counting channel 211.

[0048] The second channel section 203 of the embodiment is designed to gradually incline upward from back to front, so that the cover body b is always in close contact during the forward conveying in the conveying channel 200, and on this basis, the two screw rods 3 are arranged at the end outlet of the second channel section 203, so as to ensure that the cover body b can pass through the two screw rods 3 in sequence, and the problem of missing or subsequent cover body b catching up does not occur.

[0049] Considering that the number of rotations of one of the screw rods 3 is directly or indirectly measured by the rotary encoder 13 to realize the counting of the cover body b passing through the gap between the two screw rods 3, the problem of inaccurate counting caused by the cover body b not being conveyed to the position may occur, and in a further preferred embodiment, the counting unit further comprises an infrared sensor (not shown in the figure) for detecting the number of cover bodies b passing through between the two screw rods 3. The rotary encoder 13 may lose pulses or miscount under high-speed rotation or mechanical vibration. The infrared sensor can be used as an auxiliary counting means to check and supplement the counting of the rotary encoder 13. The infrared sensor can detect the number of cover bodies b passing through to timely discover and correct the counting error of the rotary encoder 13.

[0050] The cover body b is conveyed forward by the synchronously rotating screw rods 3, wherein the helical grooves of the two screw rods 3 are both configured to allow only one cover body b to pass between the two screw rods 3 during one rotation of the two screw rods 3, and on this basis, the number of cover bodies b passing between the two screw rods 3 is counted by directly or indirectly measuring the number of rotations of one of the screw rods 3 by the rotary encoder 13. The structure design of the above-mentioned counting unit enables each cover body b to quickly separate from the helical groove of the screw rod 3 after entering the helical groove of the screw rod 3, greatly shortening the conveying and counting time of the cover body b, improving the counting and conveying efficiency, and on the other hand, since the conveying time of each cover body b through the screw rod 3 is shortened, the problem of cover body b being scratched or squeezed during conveying is also effectively avoided.

Claims

1. A counting device for a paper bag packaging apparatus, comprising: a conveying frame (2) having a conveying channel (200) for stacking and conveying a cover body (b) forward; a feeding mechanism (22) arranged on one side of the conveying frame (2) and capable of acting on the cover body (b) in the conveying channel (200) and conveying the cover body (b) forward along the conveying channel (200); a counting unit comprising a screw assembly and a screw driving mechanism, the screw assembly comprising two spaced-apart screws (3) for allowing the cover body (b) to pass through the gap therebetween, each of the two screws (3) having a helical groove on the outer peripheral wall thereof for limiting the outer peripheral edge of the cover body (b) therein, and the screw driving mechanism being in driving connection with the two screws (3) so as to drive the two screws (3) to rotate synchronously; characterized in that the helical grooves of the two screws (3) are configured to allow only one cover body (b) to pass through the gap between the two screws (3) during one rotation of the two screws (3); and the counting unit further comprises a rotary encoder (13) for directly or indirectly measuring the number of rotations of one of the screws (3) so as to count the cover bodies (b) passing through the gap between the two screws (3). The rotary groove (30) on the screw (3) has a groove inlet (301) for allowing the outer peripheral edge of the cover body (b) to enter the rotary groove (30) and a groove outlet (302) for allowing the cover body (b) in the rotary groove (30) to move out, the groove inlet (301) and the groove outlet (302) of the rotary groove (30) being located at an angle α relative to the center axis of the screw (3) in the circumferential direction, wherein 60° < α < 120°. The counting device further comprises a vertical plate (11), the two screws (3) being rotatably arranged on the vertical plate (11), the screw driving mechanism comprising a screw driving motor (32) and two belt driving assemblies (33) in driving connection with the output shaft of the screw driving motor (32), the two belt driving assemblies (33) corresponding to the two screws (3) respectively, each of the belt driving assemblies (33) comprising at least two first pulleys (331) rotatably arranged on the vertical plate (11) and a first transmission belt (333) wound between the corresponding two first pulleys (331), the vertical plate (11) further comprising two second pulleys (332) coaxially connected with the two screws (3) respectively, and a second transmission belt (333) being wound between one of the first pulleys (331) of the belt driving assembly (33) and the second pulley (332). The second pulley (332) is connected with the screw (3) through a connecting shaft (31) rotatably arranged on the vertical plate (11), and the second pulley (332) and the screw (3) are located on the front and rear sides of the vertical plate (11) respectively. ​ ​ 2. The counting device for a paper bag packaging apparatus according to claim 1, characterized by: ​ 3. The counting device for a paper bag packaging apparatus according to claim 1, characterized by: ​ 4. The counting device for a paper bag packaging apparatus according to claim 3, characterized by: ​ 5. The counting device for a paper bag packaging apparatus according to claim 3, characterized by: The vertical plate (11) is further provided with a fixing support (12) for fixing the rotary encoder (13), the fixing support (12) is arranged adjacent to a first pulley (331) of the belt transmission assembly (33), and the rotary shaft of the rotary encoder (13) is connected with the first pulley (331) through a shaft coupling (131).

6. The counting device for a paper bag packaging apparatus according to any one of claims 1 to 5, characterized in that: The conveying channel (200) comprises a first channel section (201), an intermediate channel section (202) and a second channel section (203) connected in sequence along the conveying direction of the cover (b), the first channel section (201) is horizontally extended or gradually inclined downward from back to front, the intermediate channel section (202) is vertically extended, and the second channel section (203) is horizontally extended or gradually inclined upward from back to front.

7. The counting device for a paper bag packaging apparatus according to claim 6, characterized in that: The two screw rods (3) are arranged at the position of the end outlet of the second channel section (203).

8. The counting device for a paper bag packaging apparatus according to claim 7, characterized in that: The two screw rods (3) are arranged in an up-down interval, the end outlet of the second channel section is provided with arc-shaped limiting plates (21) arranged in an up-down interval, the notches of the two arc-shaped limiting plates (21) are opposite to each other so as to define a counting channel (211) connected with the conveying channel (200), and the arc-shaped limiting plates (21) are provided with accommodation notches (210) for the corresponding screw rods (3) to extend into the counting channel (211).

9. The counting device for a paper bag packaging apparatus according to claim 6, characterized by: The feeding mechanism (22) comprises a feeding driving motor (221) and feeding wheels (222) rotated by the feeding driving motor (221), the feeding wheels (222) are two, and the two feeding wheels (222) are arranged on the two sides of the intermediate channel section (202) and used for driving the cover (b) in the intermediate channel section (202) to convey downward.

10. The counting device for a paper bag packaging apparatus according to any one of claims 1 to 5, characterized in that: The infrared sensor for detecting the number of covers (b) passing between the two screw rods (3) is further included.

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