On-line automatic scraper adjusting device of stem pressing machine

Abstract

The invention discloses an on-line automatic scraper adjusting device of a stem pressing machine, the stem pressing machine comprises a rack, a pressing roller is rotatably arranged on the rack, a scraper is arranged on one side of the pressing roller, an adjusting device for automatically adjusting the angle of the scraper is further arranged on the rack, and the adjusting device comprises an adjusting unit, a gap detection unit and a torque detection unit; the adjusting unit comprises adjusting mechanisms symmetrically arranged on the left side and the right side of the scraper frame, the angle of the scraper is adjusted through the two adjusting mechanisms, and then the gap between the scraper and the pressing roller is adjusted. The gap detection unit is used for detecting the gap between the compression roller and the scraper in real time; and the torque detection unit is used for detecting the torsional torque of a servo motor of the servo electric cylinder assembly in real time. The device has the advantages that real-time detection, automatic compensation and posture correction of the working gap between the scraper and the compression roller are achieved, and the working gap between the scraper and the compression roller can be kept stable in the continuous production period.

Description

Technical Field

[0001] This invention relates to the field of tobacco processing equipment technology, and in particular to an online automatic scraper adjustment device for a stem pressing machine. Background Technology

[0002] The stem pressing process is a crucial step in tobacco processing, and its stability directly affects the quality of subsequent cutting, drying, and shredding. To ensure stable stem pressing thickness, the working gap between the pressing roller and the scraper needs to be maintained within a relatively stable range over a long period.

[0003] Most existing tobacco stem pressing machines rely on manual adjustment or replacement of the scraper during shutdown to maintain the working gap. As production continues, the scraper will gradually wear down, causing the gap between the scraper and the pressure roller to increase. This leads to increased tobacco residue adhering to the surface of the pressure roller, fluctuations in the thickness of the pressed stems, and an increase in the amount of broken tobacco stems.

[0004] Traditional manual adjustment methods typically involve adjusting the weight at the end of the scraper holder to change the installation angle of the scraper, thereby adjusting the gap between the scraper and the pressure roller. This manual adjustment method suffers from problems such as slow response, reliance on experience, poor repeatability, and insufficient safety, making it difficult to maintain stable operating conditions in a timely manner with minimal or no downtime. Especially in continuous production scenarios, the lack of an online adjustment device that can simultaneously handle gap detection, posture correction, load identification, and safety interlocks has become a significant factor restricting the stable improvement of pressed straw quality. Summary of the Invention

[0005] The purpose of this invention is to overcome the shortcomings of the prior art and provide an online automatic scraper adjustment device for a pressing machine, so as to realize real-time detection, automatic compensation and posture correction of the working gap between the scraper and the pressure roller, and maintain the stability of the working gap between the scraper and the pressure roller during continuous production.

[0006] This invention is achieved through the following technical solution: An online automatic scraper adjustment device for a stem pressing machine is provided. The stem pressing machine includes a frame, on which a pressure roller is rotatably mounted. The axis of the pressure roller is in the left-right direction. A scraper is provided on one side of the pressure roller. The scraper holder at the bottom of the scraper is rotatably mounted on a support member at both ends via a mounting shaft. The mounting shaft extends in the left-right direction. The support member is fixed on the frame. The frame is also provided with an adjustment device for automatically adjusting the scraper angle. The adjustment device includes an adjustment unit, a gap detection unit, and a torque detection unit. The adjustment unit includes adjustment mechanisms symmetrically arranged on the left and right sides of the scraper frame. Each adjustment mechanism includes a servo cylinder assembly and a linkage structure. The output shafts of the servo cylinder assemblies of the two adjustment mechanisms are extended and retracted. Through their respective linkage structures, the scraper frame is driven to rotate around the mounting shaft, thereby adjusting the angle of the scraper and thus adjusting the gap between the scraper and the pressure roller. The gap detection unit is used to detect the gap between the pressure roller and the scraper in real time; The torque detection unit includes torque sensors installed in two sets of servo electric cylinder assemblies, which detect the torsional torque of the servo motor of the servo electric cylinder assembly in real time.

[0007] As a preferred embodiment of the above-mentioned online automatic scraper adjustment device for the stalk pressing machine, in each of the adjustment mechanisms, the servo cylinder assembly includes a servo cylinder and a mounting plate fixed on the top of the servo cylinder. The mounting plate is hinged to the frame via a hinge shaft extending to the left and right. The linkage structure includes a connecting rod, one end of which is fixedly connected to the scraper holder, and the other end of which has a through hole extending to the left and right. A mounting post is inserted through the through hole. The output shaft of the servo cylinder is connected to the mounting post via a spherical bearing. The outer ring of the spherical bearing is fixedly connected to the output shaft of the servo cylinder, and the center hole of the inner ring of the spherical bearing is fitted to the mounting post.

[0008] As a preferred embodiment of the above-mentioned online automatic scraper adjustment device for the stalk pressing machine, the connecting rod is a multi-segment bent rod, and the two segments of the connecting rod near the front and rear ends are not on the same plane and are parallel.

[0009] As a preferred embodiment of the above-mentioned online automatic scraper adjustment device for the pressing machine, the scraper is located below and behind the pressing roller, and counterweight connecting rods extending upward and backward are fixedly provided on the left and right sides of the rear end of the scraper seat, with the front end of the connecting rod fixedly connected to the rear end of the counterweight connecting rod.

[0010] As a preferred embodiment of the above-mentioned online automatic scraper adjustment device for the stalk pressing machine, the front end of the connecting rod has an oblong hole, and the rear end of the counterweight connecting rod has an installation hole. By passing screws through the oblong hole and the installation hole and tightening the nut, the connecting rod and the counterweight connecting rod are fixedly connected.

[0011] As a preferred embodiment of the above-mentioned online automatic scraper adjustment device for the pressing machine, the gap detection unit includes a vision sensor mounted on the frame, with the vision sensor facing the gap between the pressing roller and the scraper.

[0012] As a preferred embodiment of the above-mentioned online automatic scraper adjustment device for the stalk pressing machine, the mounting plate is provided with hinge shafts at both ends, and a U-shaped mounting seat is provided on the frame. The mounting plate is hinged to the mounting seat through the hinge shafts at both ends.

[0013] The present invention has the following advantages over the prior art: This invention provides an online automatic scraper adjustment device for a straw pressing machine. It includes an adjustment unit and a gap detection unit. The gap detection unit monitors the actual gap between the scraper and the pressure roller in real time, using this information as the control basis for the adjustment unit. When the detected gap exceeds a preset gap, the adjustment unit automatically rotates the scraper holder around the mounting shaft, thereby adjusting the scraper angle and thus the gap between the scraper and the pressure roller until the gap is adjusted to the preset gap. This achieves real-time, online, and precise automatic adjustment of the gap between the scraper and the pressure roller without stopping the machine. It maintains a stable working gap between the scraper and the pressure roller during continuous production, improving the consistency of straw pressing thickness. Simultaneously, a torque detection unit is included to monitor the torsional torque of the servo motor in the servo cylinder assembly in real time. This reflects the load change of the scraper during the adjustment of the gap between the scraper and the pressure roller, providing overload protection and effectively preventing damage to the scraper and the pressure roller. Attached Figure Description

[0014] Figure 1 This is a perspective view of the output shaft of the servo electric cylinder of the present invention in an extended state.

[0015] Figure 2 yes Figure 1 Side view.

[0016] Figure 3 yes Figure 1 Top view.

[0017] Figure 4 This is a perspective view of the output shaft of the servo electric cylinder of the present invention in a retracted state.

[0018] Figure 5 yes Figure 4 Side view.

[0019] Numbered in the diagram: 1 Frame; 2 Pressure Roller; 3 Scraper; 4 Scraper Holder; 5 Mounting Shaft; 6 Adjustment Mechanism; 7 Servo Cylinder; 8 Mounting Plate; 9 Hinge Shaft; 10 Mounting Seat; 11 Connecting Rod; 12 Mounting Column; 13 Output Shaft; 14 Joint Bearing; 15 Counterweight Linkage Rod; 16 Waist Hole; 17 Vision Sensor; 18 Servo Motor; 19 Support Component. Detailed Implementation

[0020] The embodiments of the present invention are described in detail below. These embodiments are implemented based on the technical solution of the present invention, and provide detailed implementation methods and specific operation processes. However, the scope of protection of the present invention is not limited to the following embodiments.

[0021] See Figures 1 to 5This embodiment provides an online automatic scraper adjustment device for a stem pressing machine. The stem pressing machine includes a frame 1, on which a pressure roller 2 is rotatably mounted. The axis of the pressure roller 2 is set in the left-right direction. A scraper 3 is provided on one side of the pressure roller 2. The scraper 3 is located below and behind the pressure roller 2. The scraper holder 4 at the bottom of the scraper 3 is rotatably mounted on a support member 19 through a mounting shaft 5. The mounting shaft 5 extends in the left-right direction. The support member 19 is fixed on the frame 1. The frame 1 is also provided with an adjustment device for automatically adjusting the angle of the scraper 3. The adjustment device includes an adjustment unit, a gap detection unit, and a torque detection unit.

[0022] The adjustment unit includes adjustment mechanisms 6 symmetrically arranged on the left and right sides of the scraper frame 4. Each adjustment mechanism 6 includes a servo electric cylinder assembly and a connecting rod structure. The output shaft 13 of the servo electric cylinder assembly of the two adjustment mechanisms 6 is extended and retracted. Through their respective connecting rod structures, the scraper frame 4 is driven to rotate around the mounting shaft 5, thereby adjusting the angle of the scraper 3 and thus adjusting the gap between the scraper 3 and the pressure roller 2.

[0023] In each adjustment mechanism 6, the servo electric cylinder assembly includes a servo electric cylinder 7 and a mounting plate 8 fixed to the top of the servo electric cylinder 7. The mounting plate 8 is hinged to the frame 1 via hinge shafts 9 extending to the left and right. The mounting plate 8 has hinge shafts 9 at both ends. The frame 1 has a U-shaped mounting seat 10, and the mounting plate 8 is hinged to the mounting seat 10 via the hinge shafts 9 at both ends. The linkage structure includes a connecting rod 11. One end of the connecting rod 11 is fixedly connected to the scraper holder 4, and the other end of the connecting rod 11 has a through hole extending to the left and right. A mounting post 12 passes through the through hole. The output shaft 13 of the servo electric cylinder 7 is connected to the mounting post 12 via a spherical bearing 14. The outer ring of the spherical bearing 14 is fixedly connected to the output shaft 13 of the servo electric cylinder 7, and the center hole of the inner ring of the spherical bearing 14 is fitted into the mounting post 12.

[0024] The connecting rod 11 is a multi-segment bent rod. The two segments of the connecting rod 11 near the front and rear ends are not on the same plane and are parallel. Counterweight connecting rods 15 extending rearward and upward are fixedly installed on the left and right sides of the rear end of the scraper 3 seat. The front end of the connecting rod 11 is fixedly connected to the rear end of the counterweight connecting rod 15. A slotted hole 16 is opened at the front end of the connecting rod 11, and a mounting hole is opened at the rear end of the counterweight connecting rod 15. The connecting rod 11 and the counterweight connecting rod 15 are fixedly connected by passing screws through the slotted hole 16 and the mounting hole and tightening the nuts.

[0025] The torque detection unit includes torque sensors installed within two sets of servo cylinder assemblies. These sensors detect the torsional torque of the servo motor 18 of the servo cylinder assembly in real time, reflecting the load change of the scraper 3 during the adjustment of the gap between the scraper 3 and the pressure roller 2. If the detected torque is too high, it indicates that the load on the scraper 3 is excessive. The system can then control the servo cylinder 7 to stop operating, preventing the scraper 3 from contacting or colliding with the pressure roller 2, thus providing overload protection and preventing damage to both the scraper 3 and the pressure roller 2. The torque sensor's detection range is 0~500 N·m.

[0026] The gap detection unit is used to detect the gap between the pressure roller 2 and the scraper 3 in real time. The gap detection unit includes a vision sensor 17 mounted on the frame 1, which is positioned to face the gap between the pressure roller 2 and the scraper 3. The vision sensor 17 can be a binocular 3D vision sensor to detect the gap between the pressure roller 2 and the scraper 3 in real time. The detection result of the gap can be used as the basis for controlling the start and stop of the servo electric cylinder 7 and the extension length of the output shaft 13.

[0027] During continuous production of the straw pressing machine, the gap between the pressure roller 2 and the scraper 3 is detected in real time by a vision sensor 17. The servo cylinders 7 of the two adjustment mechanisms 6 are started and stopped according to this gap. When the detected gap exceeds the preset gap, it indicates that the scraper 3 is worn too much. At this time, the servo cylinders 7 of the two adjustment mechanisms 6 are controlled to move, so that the output shafts 13 of the two servo cylinders 7 retract synchronously by a certain distance, driving the scraper 3 to rotate around the mounting shaft 5 towards the pressure roller 2 at a certain angle. The vision sensor 17 detects the gap in real time. When the gap reaches the preset gap, the servo cylinders 7 of the two adjustment mechanisms 6 are controlled to stop, so that the scraper 3 is kept at that angle position. This realizes real-time, online, and precise automatic adjustment of the gap between the scraper 3 and the pressure roller 2 without stopping the machine for adjustment. It can maintain a stable working gap between the scraper 3 and the pressure roller 2 during continuous production and reduce the fluctuation of straw pressing quality caused by scraper 3 wear. Compared with the traditional method of adjustment relying on manual experience, this adjustment device has the advantages of timely response, precise control, strong traceability, and high safety. Furthermore, it eliminates the need for frequent replacement of the scraper 3, thus extending its lifespan and saving costs.

[0028] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. An online automatic scraper adjustment device for a stem pressing machine, the stem pressing machine including a frame (1), a pressure roller (2) rotatably mounted on the frame (1), the axial direction of the pressure roller (2) being left and right, a scraper (3) being mounted on one side of the pressure roller (2), the scraper holder (4) at the bottom of the scraper (3) being rotatably mounted on a support member (19) via a mounting shaft (5), the mounting shaft (5) extending in the left and right direction, and the support member (19) being fixed on the frame (1), characterized in that: The frame (1) is also provided with an adjustment device for automatically adjusting the angle of the scraper (3). The adjustment device includes an adjustment unit, a gap detection unit, and a torque detection unit. The adjustment unit includes adjustment mechanisms (6) symmetrically arranged on the left and right sides of the scraper frame (4). Each adjustment mechanism (6) includes a servo electric cylinder assembly and a linkage structure. The output shaft (13) of the servo electric cylinder assembly of the two adjustment mechanisms (6) is extended and retracted. Through their respective linkage structures, the scraper frame (4) is driven to rotate around the mounting shaft (5), thereby adjusting the angle of the scraper (3) and thus adjusting the gap between the scraper (3) and the pressure roller (2). The gap detection unit is used to detect the gap between the pressure roller (2) and the scraper (3) in real time; The torque detection unit includes torque sensors installed in the two sets of servo electric cylinder assemblies, which detect the torsional torque of the servo motor (18) of the servo electric cylinder assembly in real time.

2. The online automatic scraper adjustment device for a stem pressing machine as described in claim 1, characterized in that: In each of the adjustment mechanisms (6), the servo electric cylinder assembly includes a servo electric cylinder (7) and a mounting plate (8) fixed on the top of the servo electric cylinder (7). The mounting plate (8) is hinged to the frame (1) by a hinge shaft (9) extending to the left and right. The linkage structure includes a connecting rod (11). One end of the connecting rod (11) is fixedly connected to the scraper frame (4). The other end of the connecting rod (11) has a through hole extending to the left and right. A mounting post (12) is inserted through the through hole. The output shaft (13) of the servo electric cylinder (7) is connected to the mounting post (12) through a spherical bearing (14). The outer ring of the spherical bearing (14) is fixedly connected to the output shaft (13) of the servo electric cylinder (7). The center hole of the inner ring of the spherical bearing (14) is fitted to the mounting post (12).

3. The online automatic scraper adjustment device for a stem pressing machine as described in claim 2, characterized in that: The connecting rod (11) is a multi-segment bent rod, and the two segments of the connecting rod (11) near the front and rear ends are not on the same plane and are parallel.

4. The online automatic scraper adjustment device for a stem pressing machine as described in claim 2, characterized in that: The scraper (3) is located below the pressure roller (2). The left and right sides of the rear end of the scraper (3) seat are respectively fixed with counterweight connecting rods (15) extending backward and upward. The front end of the connecting rod (11) is fixedly connected to the rear end of the counterweight connecting rod (15).

5. The online automatic scraper adjustment device for a stem pressing machine as described in claim 4, characterized in that: The front end of the connecting rod (11) has a waist-shaped hole (16), and the rear end of the counterweight connecting rod (15) has a mounting hole. By passing a screw through the waist-shaped hole (16) and the mounting hole and tightening the nut, the connecting rod (11) and the counterweight connecting rod (15) are fixedly connected.

6. The online automatic scraper adjustment device for a stem pressing machine as described in claim 2, characterized in that: The gap detection unit includes a vision sensor (17) mounted on the frame (1), which is positioned toward the gap between the pressure roller (2) and the scraper (3).

7. The online automatic scraper adjustment device for a stem pressing machine as described in claim 2, characterized in that: The mounting plate (8) is provided with hinge shafts (9) at both ends, and a U-shaped mounting seat (10) is provided on the frame (1). The mounting plate (8) is hinged to the mounting seat (10) through the hinge shafts (9) at both ends.

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