Metal plate polishing machine and control method

Abstract

The invention discloses a metal plate polishing machine and a control method.The metal plate polishing machine comprises a working base table, and a conveying belt, a feeding motor used for driving the conveying belt, a polishing roller located above the conveying belt, a main motor used for driving the polishing roller and a lifting mechanism used for driving the polishing roller to ascend and descend are arranged on the working base table; the feeding motor and the main motor are electrically connected with the controller, the conveying belt is arranged in front of the working base table, the feeding motor is arranged behind the conveying belt and is in transmission connection with a driving shaft at the feeding end of the conveying belt, and the main motor is located behind the conveying belt and is in transmission connection with the polishing roller. The case is arranged on the side, away from the feeding motor, of the main motor in the width direction. According to the metal plate polishing machine and the control method, the metal plate polishing machine is compact in structural layout, simple in structure, light in weight and convenient to carry by operators.

Description

Technical Field

[0001] This invention relates to the technical field of polishing machines, specifically a metal sheet polishing machine and its control method. Background Technology

[0002] Polishing machines, also known as grinding machines, are commonly used for mechanical grinding, polishing, and waxing. Most existing polishing machines are large industrial models, heavy and bulky, typically fixed in a specific location and difficult to move. This makes them inconvenient in scenarios requiring frequent relocation, such as home or individual studio use. Especially in modern life, more and more people enjoy making their own tools, leading to a rapid trend towards miniaturization and lightweight design in various mechanical tools. However, in the polishing machine field, there are currently no miniaturized and lightweight polishing machines suitable for home or individual studio use. Summary of the Invention

[0003] The present invention aims to at least partially solve one of the technical problems in the related art: to provide a metal sheet polishing machine and control method, which has a simple structure, compact layout, and light weight, thus facilitating transportation.

[0004] Therefore, one object of the present invention is to provide a metal sheet polishing machine, comprising a work base, a conveyor belt for conveying metal sheets, a feed motor for driving the conveyor belt, a polishing roller located above the conveyor belt, a main motor for driving the polishing roller, a lifting mechanism for raising and lowering the polishing roller, and a housing with a controller inside. Several buttons are arranged on the panel of the housing. The feed motor and the main motor are electrically connected to the controller. The conveyor belt is arranged in front of the work base, the feed motor is arranged behind the conveyor belt and is driven by a drive shaft on the conveyor belt, and the main motor is located behind the conveyor belt and is driven by the polishing roller. The housing is arranged along the width direction on the side opposite to the feed motor of the main motor. The compact layout of the conveyor belt, feed motor, main motor, and housing on the work base reduces the overall size of the work base, thereby reducing the weight of the entire metal sheet polishing machine and facilitating operator handling.

[0005] According to one example of the present invention, the lifting mechanism includes a lead screw, a lead screw nut, and a hand crank. The lead screw is vertically mounted on the housing, and the lead screw nut is threadedly driven by the lead screw. The housing of the main motor is fixedly connected to the lead screw nut. The upper end of the lead screw protrudes outside the housing, and the hand crank is connected to the upper end of the lead screw. The height of the main motor and the polishing roller can be manually adjusted via the hand crank. Compared to using an electric lifting device, this method significantly reduces weight, making it suitable for personal use. Furthermore, the manual height adjustment structure is more reliable and less prone to malfunction.

[0006] According to one embodiment of the present invention, a mounting plate is provided between the main motor and the polishing roller, the housing of the main motor is fixed to the mounting plate, the rotating shaft of the main motor passes through the mounting plate, and the end of the rotating shaft is connected to the central shaft of the polishing roller.

[0007] According to one embodiment of the invention, the mounting plate is provided with a dust cover that covers the polishing roller, and a gap is left between the dust cover and the conveyor belt to allow the metal sheet to pass through.

[0008] According to one embodiment of the invention, the polishing roller is provided with pressure rollers on both sides along its width direction. The rear ends of both pressure rollers are connected to a mounting plate, and the pressure rollers are configured to rotate around their own axes in conjunction with the mounting plate. The two pressure rollers can press the metal sheet on the conveyor belt firmly onto the conveyor belt, increasing the friction between the metal sheet and the conveyor belt.

[0009] According to one embodiment of the present invention, the mounting plate is provided with slide rails extending vertically at the positions corresponding to the rear ends of the two pressure rollers, and the slide rails are provided with sliders that slide with the slide rails. The rear ends of the two pressure rollers are connected to their respective corresponding sliders, and the mounting plate is provided with thrust springs. The thrust springs are configured to apply a downward thrust to the sliders, so that the sliders and the pressure rollers on the sliders have a tendency to move downward.

[0010] According to an example of the present invention, the pressure roller includes a front pressure roller and a rear pressure roller located on both sides of the polishing roller. The front pressure roller is located on the side of the polishing roller closer to the feeding end. The front pressure roller and / or the rear pressure roller are provided with an overrunning clutch. The overrunning clutch is configured to be in a locked state when the rotational speed exceeds a set value and in an active state when the rotational speed is less than or equal to the set value. When the overrunning clutch is locked, the pressure roller can only reverse. When the overrunning clutch is in the active state, the pressure roller can rotate forward or backward.

[0011] By adding an overrunning clutch inside the pressure roller, it is possible to prevent metal sheets from being ejected in the feeding direction when subjected to a large force from the polishing roller, thus avoiding injury to people and objects. Especially in home settings, where polishing operators often have weaker polishing skills and safety awareness, injuries caused by flying metal sheets are more likely. This overrunning clutch can reduce the kinetic energy of the flying metal sheet and even confine it between the pressure roller and the conveyor belt, preventing accidental ejection.

[0012] According to one embodiment of the present invention, the overrunning clutch includes an inner cylinder and an outer cylinder sleeved outside the inner cylinder. The inner sidewall of the outer cylinder has a plurality of circumferentially evenly arranged reverse tooth grooves. A plurality of circumferentially evenly arranged movable plates are provided between the inner cylinder and the outer cylinder. One end of the movable plate is hinged to the inner cylinder, and the other end of the movable plate has teeth that match the reverse tooth grooves. A tension spring is provided on the inner cylinder at the position corresponding to each movable plate. One end of the tension spring is fixed to the inner cylinder, and the other end is connected to the movable plate. The movable plate disengages from the reverse tooth grooves under the tension of the tension springs or rotates outwards until the teeth of the movable plate abut against the reverse tooth grooves when the centrifugal force is greater than the tension of the tension springs.

[0013] According to one embodiment of the present invention, both the front and rear pressure rollers are equipped with pressure sensors for detecting the pressure value between the pressure rollers and the metal sheet. The two pressure sensors are communicatively connected to the controller. Since a large amount of dust particles are inevitably generated in the polishing environment, there is a possibility that the pressure rollers may become stuck due to track blockage, preventing them from descending normally and thus causing the overrunning clutch's protective function to fail. Therefore, pressure detection by the pressure sensors allows for timely shutdown of the equipment in the event of overrunning clutch failure, and provides an indication so that operators can promptly clean and maintain the equipment.

[0014] Therefore, another object of the present invention is to provide a control method, including the above-mentioned metal sheet polishing machine, wherein the metal sheet polishing machine has an indicator light on its chassis panel; After starting the feed motor and main motor, if the pressure value detected by the first pressure sensor in the front pressure roller is within the set range S1 after the metal sheet contacts the front pressure roller, a first qualified detection signal is issued; otherwise, a stop signal is issued. The controller shuts down the feed motor based on the received stop signal. Taking the time of the first qualified detection signal obtained by the controller as the initial time T0, the time t for the metal sheet to be transmitted between the two pressure rollers is calculated based on the conveyor belt speed v and the distance between the two pressure rollers. If the second pressure sensor in the rear pressure roller does not obtain a detection signal within the time interval t+C after the initial time T0, or if the pressure value detected by the second pressure sensor is less than the set range S2, a termination signal is issued. The controller shuts down the main motor and feed motor based on the termination signal; otherwise, a second qualified detection signal is issued. Here, C is a set time constant. The controller control indicator light provides different light prompts when the controller receives the first qualified detection signal, the second qualified detection signal, the stop signal, and the termination signal. Two pressure sensors can determine whether the pressure roller has descended to the correct position by detecting the pressure value. If the pressure roller has not descended to the correct position, the corresponding feed motor and / or main motor can be shut down in time, thereby ensuring that the overrunning clutch inside the pressure roller can always be in an effective state. That is, the overrunning clutch can play a protective role in the event of an accident in which the metal sheet is ejected at high speed.

[0015] The above technical solution has the following advantages or beneficial effects: First, the compact layout of the conveyor belt, feed motor, main motor, and chassis on the work platform reduces the overall size of the work platform, thus lightening the weight of the entire metal plate polishing machine and facilitating operator handling and use. Second, pressure rollers are installed before and after the polishing roller, ensuring the metal plate is firmly pressed onto the conveyor belt, guaranteeing the polishing effect. Third, an overrunning clutch is installed inside the pressure roller. When the metal plate is subjected to a large force from the polishing roller and tends to be ejected at high speed in the feeding direction, the overrunning clutch reduces the kinetic energy of the metal plate, thereby reducing or even preventing damage to personnel and external objects. In cases of injury, especially when used in personal workshops, where operators have less polishing experience and safety awareness than professional polishers in factories, the risk of personal injury due to accidental ejection of metal sheets during polishing is far higher than that of polishers in factories. Therefore, this overrunning clutch can significantly reduce the risk of metal sheet damage to personnel and equipment when the polishing machine is used in home applications. Finally, through the addition of pressure sensors and control methods, when the pressure roller jams and fails to descend, causing the corresponding overrunning clutch to malfunction, the corresponding motor can be automatically shut down and the operator can be alerted to the fault, ensuring that the overrunning clutch remains effective during the operation of the polishing machine.

[0016] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0017] Figure 1 This is an isometric view of the metal sheet polishing machine of the present invention.

[0018] Figure 2 for Figure 1 A schematic diagram of the explosive decomposition of a metal sheet polishing machine.

[0019] Figure 3 This is a left-side view of the metal sheet polishing machine of the present invention.

[0020] Figure 4 This is a front view schematic diagram of the metal sheet polishing machine of the present invention.

[0021] Figure 5 for Figure 4 A magnified view of a portion of region "A".

[0022] Figure 6 This is a control logic block diagram of the metal sheet polishing machine of the present invention.

[0023] Figure 7 This is a schematic diagram of the polishing cylinder in this invention.

[0024] Figure 8 This is a schematic diagram of another structure of the polishing cylinder in this invention.

[0025] The components include: 1. Working platform; 2. Metal sheet; 3. Conveyor belt; 3.1. Drive shaft; 4. Feed motor; 5. Polishing roller; 5.1. Central shaft; 5.2. Polishing cylinder; 6. Main motor; 7. Lifting mechanism; 7.1. Lead screw; 7.2. Lead screw nut; 7.3. Hand crank; 8. Machine housing; 9. Controller; 10. Button; 11. Mounting plate; 12. Dust cover; 13. Slide rail; 14. Slider; 15. Thrust spring; 16. Front pressure roller; 17. Rear pressure roller; 18. Overrunning clutch; 18.1. Inner cylinder; 18.2. Outer cylinder; 18.3. Backtooth groove; 18.4. Moving plate; 18.5. Tooth; 18.6. Tension spring; 18.7. Rubber layer; 19. First pressure sensor; 20. Second pressure sensor; 21. Indicator light. Detailed Implementation

[0026] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0027] The metal sheet polishing machine and control method according to embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0028] This invention provides a metal sheet polishing machine and its control method. As shown in the figure, it includes a working base 1, on which a conveyor belt 3, a feed motor 4, a polishing roller 5, a main motor 6, a lifting mechanism 7, and a housing 8 are mounted. The conveyor belt 3 is positioned in front of the operator on the working base 1, with the loading end of the conveyor belt 3 located on the left side of the working base 1 in the width direction and the unloading end located on the right side of the working base 1 in the width direction. The entire conveyor belt 3 extends horizontally from left to right. The feed motor 4 is located behind the conveyor belt 3. The housing of the feed motor 4 is fixedly connected to the working base 1, and the output shaft of the feed motor 4 is driven by a drive shaft 3.1 on the loading end of the conveyor belt 3. Preferably, the output shaft of the feed motor 4 is fixedly connected to the drive shaft 3.1 via a coupling. The polishing roller 5 is located above the conveyor belt 3 and is used to polish the metal sheets on the conveyor belt 3. The main motor 6 is located behind the polishing roller 5, and its output shaft is connected to the central shaft of the polishing roller 5. Preferably, the output shaft of the main motor and the central shaft of the polishing roller 5 are fixedly connected by a coupling. Furthermore, the main motor is mounted on a lifting mechanism 7, which is fixedly mounted on the work base 1. Thus, the lifting mechanism 7 can drive the main motor 6 and the polishing roller 5 on the main motor 6 to move up and down. The housing 8 is equipped with a controller 9 and a power module electrically connected to the controller 9. Several buttons 10 electrically connected to the controller 9 are arranged on the panel of the housing 8. The feed motor 4 and the main motor 6 are respectively electrically connected to the controller 9.

[0029] Preferably, the chassis 8 is arranged along the width direction on the side of the main motor 6 opposite to the feed motor 4.

[0030] Preferably, the working platform 1 is a flat, sheet-like structure with several weight-reducing holes. This significantly reduces the weight of the entire working platform 1.

[0031] Example 2 Based on one preferred example of the lifting mechanism 7 in the above embodiments: as shown in the figure, the housing 8 is located at the upper right corner of the work base 1, so the housing 8 is adjacent to the main motor 6. Therefore, the housing 8 can serve as the carrier of the lifting mechanism 7, improving the stability of the lifting mechanism 7. Specifically, the lifting mechanism 7 includes a lead screw 7.1 installed vertically on the housing 8 and a lead screw nut 7.2 threadedly driven by the lead screw 7.1. The two ends of the lead screw are rotatably engaged with the bearing holes on the housing 8. The lead screw nut 7.2 is fitted onto the lead screw 7.1 and can move up and down with the rotation of the lead screw 7.1. The housing of the main motor 6 is fixedly connected to the lead screw nut 7.2. The upper end of the lead screw 7.1 is exposed outside the housing 8 and connected to the hand crank 7.3 on the top of the housing 8. Thus, in this embodiment, the height adjustment of the main motor 6 and the polishing roller 5 can be achieved by hand cranking. Although this manual adjustment method is more inconvenient than electric or hydraulic methods, it can greatly reduce the weight of the lifting mechanism 7, which is beneficial to the lightweight design of the polishing machine in this embodiment.

[0032] Example 3 Based on one of the preferred examples of the lifting mechanism 7 in the above embodiments: the lifting mechanism 7 includes a linear motor mounted vertically on the side wall of the housing 8. The linear motor is an existing commercially available product, so the structure of the linear motor will not be described in detail. The housing of the main motor 6 is fixedly connected to the moving parts on the linear motor, thereby driving the main motor 6 to perform lifting and adjustment through the linear motor.

[0033] Preferably, the lifting mechanism 7 can also be other conventional lifting mechanisms that are commercially available and have lifting functions and can adjust the height.

[0034] Example 4 like Figure 2 As shown, in a preferred embodiment, a mounting plate 11 is provided between the main motor 6 and the polishing roller 5. The housing of the main motor 6 is fixed to the mounting plate 11. The rotating shaft of the main motor 6 passes through the mounting plate 11 and is connected to the central shaft 5.1 of the polishing roller 5 to drive the polishing roller 5 to rotate.

[0035] Preferably, the mounting plate 11 is provided with a dust cover 12 covering the polishing roller 5. The bottom of the dust cover 12 has an opening. When the mounting plate 11 drives the dust cover 12 to its limit position, the gap between the dust cover 12 and the conveyor belt 3 below should be greater than the thickness of the metal sheet, so that the metal sheet on the conveyor belt 3 can pass smoothly through the gap between the dust cover 12 and the conveyor belt 3. It should be understood that, due to the different thicknesses of the metal sheets, the dust cover is positioned relatively high on the left and right side plates corresponding to the feeding direction while meeting dust prevention requirements, so that the gap between the dust cover and the conveyor belt 3 below can meet the passage requirements of most metal sheets.

[0036] Furthermore, the distance between the side plate of the dust cover 12 near the feeding end and the lower conveyor belt 3 is greater than the distance between the side plate of the dust cover 12 near the unloading end and the lower conveyor belt 3.

[0037] like Figure 2 , Figure 7 and Figure 8 As shown, the polishing roller 5 includes a central shaft 5.1 and a polishing cylinder 5.2 sleeved around the central shaft 5.1. The polishing cylinder 5.2 is detachably connected to the central shaft 5.1. Depending on the type of metal sheet 2 to be polished, any existing conventional polishing cylinder can be selected, including but not limited to... Figure 7 and Figure 8 The two types of abrasive wheels shown have their center holes in the polishing barrels 5.2 matching the center shaft 5.1.

[0038] Example 5 Based on the preferred embodiment described above, the polishing roller 5 is provided with pressure rollers on both sides along the width direction. The two pressure rollers include a front pressure roller 16 arranged on the left side of the polishing roller 5 along the feeding direction of the conveyor belt 3 for conveying metal sheets and a rear pressure roller 17 arranged on the right side of the polishing roller 5. The rear ends of the two pressure rollers are connected to the mounting plate 11, and the pressure rollers are configured to be able to rotate around their own axis and cooperate with the mounting plate 11.

[0039] Specifically, the pressure rollers are sleeved on their respective mandrels, the rear end of the mandrels is fixed to the mounting plate 11, and the pressure rollers and mandrels are rotatably coupled.

[0040] Example 6 Based on the preferred embodiment of the above, such as Figure 2 and Figure 4 As shown, the mounting plate 11 has vertically extending slide rails 13 at the rear ends of the two pressure rollers. Each slide rail 13 has a sliding block 14 that slides along it. The sliding block 14 is a long strip structure. The rear ends of the two pressure rollers are connected to their respective sliding blocks 14. The mounting plate 11 also has a thrust spring 15 for driving the sliding blocks 14 and the pressure rollers on them to move downwards. The upper end of the thrust spring 15 has a crossbar, one end of which is fixed to the mounting plate 11. The upper end of the thrust spring 15 is fixed to the crossbar, and the lower end is fixed to the sliding block 14. Thus, under the vertically downward elastic force of the thrust spring 15, the sliding block tends to move downwards. Therefore, when the metal sheet passes the position of the pressure roller and drives it upwards, the pressure roller can apply downward pressure to the metal sheet under the force of the thrust spring 15, increasing the static friction between the metal sheet and the conveyor belt.

[0041] Example 7 Based on the preferred embodiment of the above, such as Figure 4 and Figure 5 As shown, the pressure roller includes a front pressure roller 16 located on the side of the polishing roller 5 near the feeding end and a rear pressure roller 17 on the other side. The front pressure roller 16 is provided with an overrunning clutch 18. The overrunning clutch 18 is configured to be in a locked state when the rotational speed exceeds a set value and in an active state when the rotational speed is less than or equal to the set value. When the overrunning clutch 18 is in the locked state, the pressure roller can only reverse. When the overrunning clutch 18 is in the active state, the pressure roller can rotate forward or backward.

[0042] And / or, the rear pressure roller 17 is provided with an overrunning clutch 18, which is configured to be locked when the rotational speed exceeds a set value and active when the rotational speed is less than or equal to the set value; when the overrunning clutch 18 is locked, the pressure roller can only reverse; when the overrunning clutch 18 is active, the pressure roller can rotate forward or backward.

[0043] Because the pressure rollers are equipped with an overrunning clutch 18, when the metal sheet moves forward at a constant speed under the drive of the conveyor belt and completes polishing, the rotation speed of the two pressure rollers is also constant and within the set normal range. At this time, the overrunning clutch 18 is in an active state, so the pressure rollers can rotate freely in the circumferential direction. However, when the metal sheet thickness is uneven, or when there are foreign objects on the conveyor belt causing the metal sheet to be raised, the force between the metal sheet and the polishing roller 5 will increase instantaneously. The larger force will push the metal sheet to move forward in the feeding direction with a large thrust. This thrust will overcome the friction on the conveyor belt, thus causing the metal sheet to be ejected forward at high speed, which can easily cause injury to people or objects in front of the feeding direction. In this embodiment, the instantaneous high-speed forward movement of the metal sheet will cause the instantaneous increase of the pressure roller speed. When the speed of the pressure roller exceeds the set value, the overrunning clutch 18 can switch from the active state to the locked state. At this time, the overrunning clutch 18 locks the pressure roller, restricting the forward rotation direction of the pressure roller. Therefore, the rolling friction between the pressure roller and the metal sheet will become sliding friction or static friction, which greatly reduces the speed of the metal sheet.

[0044] In this embodiment, the forward and reverse rotation of the pressure roller refers to the direction in which the pressure roller rotates synchronously when the metal sheet moves along the feeding direction after the pressure roller comes into contact with it. See [link to documentation]. Figure 4 and Figure 5 As shown, the forward rotation direction is the counterclockwise direction of the two pressure rollers, and the reverse rotation direction is the clockwise direction.

[0045] It should be understood that the set value can be obtained through a limited number of experiments, and detailed set value data will not be described in detail in this embodiment.

[0046] Example 8 Based on the preferred embodiment of the overrunning clutch 18 in the above embodiment 7, such as Figure 5 As shown, the overrunning clutch 18 includes an inner cylinder 18.1 and an outer cylinder 18.2 sleeved outside the inner cylinder 18.1. The inner wall of the outer cylinder 18.2 has a plurality of circumferentially evenly arranged reverse tooth grooves 18.3. A plurality of circumferentially evenly arranged movable plates 18.4 are provided between the inner cylinder 18.1 and the outer cylinder 18.2. One end of the movable plate 18.4 is hinged to the inner cylinder 18.1, and the other end of the movable plate 18.4 has teeth that match the reverse tooth grooves 18.3. 18.5. A tension spring 18.6 is provided on the inner cylinder 18.1 at the position corresponding to each movable piece 18.4. One end of the tension spring 18.6 is fixed to the inner cylinder 18.1, and the other end is connected to the movable piece 18.4. The movable piece 18.4 is disengaged from the reverse tooth groove 18.3 under the tension of the tension spring 18.6, or rotates outward when the centrifugal force is greater than the tension of the tension spring 18.6 until the teeth 18.5 of the movable piece 18.4 abut against the reverse tooth groove 18.3. When the speed of the pressure roller driving the overrunning clutch 18 is less than or equal to the set speed, the tension of the tension spring 18.6 can overcome the centrifugal force and keep the movable plate 18.4 in the position disengaged from the inverted tooth groove 18.3. Conversely, when the speed of the pressure roller driving the overrunning clutch 18 is greater than the set speed, the centrifugal force increases and exceeds the tension of the tension spring 18.6, thereby causing the toothed end of the movable plate 18.4 to move radially outward until it abuts against the inverted tooth groove 18.3. At this time, the forward rotation direction of the outer cylinder 18.2 is restricted.

[0047] Preferably, the outer cylinder 18.2 is further provided with a rubber layer 18.7 covering the outer wall of the outer cylinder 18.2. The rubber layer can not only serve as a buffer layer to reduce the indentation of the pressure roller on the metal plate, but also increase the static friction and sliding friction between the pressure roller and the metal plate.

[0048] Example 9 In the above embodiment 8, although the presence of the overrunning clutch 18 can greatly reduce the damage to people and objects caused by the instantaneous high-speed ejection of metal sheets, a large amount of debris will be generated during the polishing process. This debris may get stuck between the slide rail 13 and the slider 14 in the above embodiment, causing the slider 14 to jam. When the thickness of the first piece of metal sheet being processed is large, the pressure roller is in a higher position. If the slider 14 jams at this time, when the thickness of the next piece of metal sheet being processed is small, the pressure roller will not be able to press well onto the metal sheet. If the metal sheet is ejected at high speed, the pressure roller and the metal sheet are disengaged, and the metal sheet will not drive the pressure roller to rotate. Therefore, the overrunning clutch 18 may fail, especially the slide rail 13 and the slider 14 on the rear pressure roller 17 may jam. To address this, the improvement in this embodiment is that both the front pressure roller 16 and the rear pressure roller 17 are equipped with pressure sensors for detecting the pressure value between the pressure roller and the metal sheet 2. The two pressure sensors are respectively connected to the controller 9. The pressure sensor can be one of a variety of existing conventional pressure sensors, such as a pressure plate type pressure sensor, in which the pressure plate can be arranged between the outer wall of the outer cylinder 18.2 of the pressure roller and the outer rubber layer.

[0049] In this embodiment, the pressure sensor located inside the front pressure roller 16 is the first pressure sensor 19, and the pressure sensor located inside the rear pressure roller 17 is the second pressure sensor 20.

[0050] Example 10 Based on the control method of the metal plate polishing machine in the above embodiment 9, including the above-mentioned metal plate polishing machine, the machine casing 8 of the metal plate polishing machine is provided with an indicator light 21; First, start the feed motor 4 and the main motor 6; Then, the metal sheet 2 is placed on the feeding end of the conveyor belt 3. As the conveyor belt 3 runs, it drives the metal sheet forward. After the metal sheet 2 contacts the front pressure roller 16, the first pressure sensor 19 inside the front pressure roller 16 will obtain the pressure detection value. If the pressure value detected by the first pressure sensor 19 inside the front pressure roller 16 is within the set range S1, the first pressure sensor 19 will send a first qualified detection signal. The controller receives the first qualified detection signal and keeps the feed motor 4 and the main motor 6 running. Otherwise, the first pressure sensor 19 will send a stop signal, and the controller 9 will shut down the feed motor 4 based on the received stop signal. Taking the time of the first qualified detection signal obtained by the controller 9 as the initial time T0, the calculation module in the controller calculates the time t for the metal sheet 2 to be transmitted between the two pressure rollers based on the transmission speed v of the conveyor belt 3 and the distance between the two pressure rollers. The transmission speed v can be a fixed parameter that is manually input in advance, or it can be calculated by obtaining the speed of the feed motor through the speed sensor. Alternatively, a speed sensor can be added to the conveyor belt 3 to obtain a more accurate transmission speed. If the second pressure sensor 20 in the rear pressure roller 17 does not obtain a detection signal within the time interval t+C after the initial time T0, or if the pressure value detected by the second pressure sensor 20 within the time interval t+C is less than the set range S2, a termination signal is issued. The controller 9 shuts down the main motor 6 and the feed motor 4 based on the termination signal. Otherwise, the second pressure sensor 20 issues a second qualified detection signal. Where C is a set time constant; Finally, the controller 9 controls the indicator light 21 to provide different light prompts when the controller 9 receives the first qualified detection signal, the second qualified detection signal, the stop signal, and the termination signal. These light prompts include, but are not limited to, changes in the color or flashing of the indicator light 21.

[0051] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

[0052] For those skilled in the art, various changes and modifications will undoubtedly be apparent after reading the above description. Therefore, the appended claims should be construed as covering all changes and modifications that encompass the true intent and scope of the invention. Any and all equivalent scope and content within the scope of the claims should be considered to remain within the intent and scope of the invention.

Claims

1. A metal sheet polishing machine, comprising a work base (1), characterized in that: The work platform (1) is provided with a conveyor belt (3) for conveying metal plates (2), a feed motor (4) for driving the conveyor belt (3), a polishing roller (5) located above the conveyor belt (3), a main motor (6) for driving the polishing roller (5), a lifting mechanism (7) for driving the polishing roller (5) to rise and fall, and a housing (8) with a controller (9) inside. Several buttons (10) are arranged on the panel of the housing (8). The feed motor (4) and the main motor (6) are electrically connected to the controller (9). The conveyor belt (3) is arranged in front of the work platform (1), the feed motor (4) is arranged behind the conveyor belt (3), and the feed motor (4) is connected to the drive shaft (3.1) on the conveyor belt (3). The main motor (6) is located behind the conveyor belt (3), and the main motor (6) is connected to the polishing roller (5). The housing (8) is arranged along the width direction on the side of the main motor (6) away from the feed motor (4).

2. The metal sheet polishing machine according to claim 1, characterized in that: The lifting mechanism (7) includes a lead screw (7.1), a lead screw nut (7.2), and a hand crank (7.3). The lead screw (7.1) is installed vertically on the housing (8). The lead screw nut (7.2) is threadedly driven to the lead screw (7.1). The housing of the main motor (6) is fixedly connected to the lead screw nut (7.2). The upper end of the lead screw (7.1) is exposed outside the housing (8). The hand crank (7.3) is connected to the upper end of the lead screw (7.1).

3. The metal sheet polishing machine according to claim 1, characterized in that: An mounting plate (11) is provided between the main motor (6) and the polishing roller (5). The housing of the main motor (6) is fixed to the mounting plate (11). The rotating shaft of the main motor (6) passes through the mounting plate (11), and the end of the rotating shaft is connected to the central shaft (5.1) of the polishing roller (5).

4. The metal sheet polishing machine according to claim 3, characterized in that: The mounting plate (11) is provided with a dust cover (12), which covers the polishing roller (5). A gap is left between the dust cover (12) and the conveyor belt (3) to allow the metal plate (2) to pass through.

5. The metal sheet polishing machine according to claim 3, characterized in that: The polishing roller (5) is provided with pressure rollers on both sides along the width direction. The rear ends of the two pressure rollers are connected to the mounting plate (11), and the pressure rollers are configured to be able to rotate around their own axis and cooperate with the mounting plate (11).

6. The metal sheet polishing machine according to claim 5, characterized in that: The mounting plate (11) is provided with vertically extending slide rails (13) at the positions corresponding to the rear ends of the two pressure rollers. The slide rails (13) are provided with sliders (14) that slide with the slide rails (13). The rear ends of the two pressure rollers are connected to their respective sliders (14). The mounting plate (11) is provided with thrust springs (15), which are configured to apply downward thrust to the sliders (14).

7. The metal sheet polishing machine according to claim 5, characterized in that: The pressure rollers include a front pressure roller (16) and a rear pressure roller (17) located on both sides of the polishing roller (5). The front pressure roller (16) is located on the side of the polishing roller (5) near the feeding end. The front pressure roller (16) and / or the rear pressure roller (17) are provided with an overrunning clutch (18). The overrunning clutch (18) is configured to be locked when the rotational speed exceeds a set value and active when the rotational speed is less than or equal to the set value. When the overrunning clutch (18) is in the locked state, the pressure roller corresponding to the overrunning clutch (18) can only reverse; When the overrunning clutch (18) is in the active state, the pressure roller corresponding to the overrunning clutch (18) can rotate forward or backward.

8. The metal sheet polishing machine according to claim 7, characterized in that: The overrunning clutch (18) includes an inner cylinder (18.1) and an outer cylinder (18.2) fitted outside the inner cylinder (18.1). The inner wall of the outer cylinder (18.2) has several circumferentially evenly arranged reverse tooth grooves (18.3). A plurality of circumferentially evenly arranged movable plates (18.4) are provided between the inner cylinder (18.1) and the outer cylinder (18.2). One end of the movable plate (18.4) is hinged to the inner cylinder (18.1), and the other end of the movable plate (18.4) has teeth (18 teeth) that match the reverse tooth grooves (18.3). .5), a tension spring (18.6) is provided on the inner cylinder (18.1) at the position corresponding to each movable piece (18.4). One end of the tension spring (18.6) is fixed to the inner cylinder (18.1), and the other end is connected to the movable piece (18.4). The movable piece (18.4) is disengaged from the reverse tooth groove (18.3) under the tension of the tension spring (18.6) or rotates outward until the teeth (18.5) of the movable piece (18.4) abut against the reverse tooth groove (18.3) when the centrifugal force is greater than the tension of the tension spring (18.6).

9. The metal sheet polishing machine according to claim 8, characterized in that: The front pressure roller (16) and the rear pressure roller (17) are each equipped with a pressure sensor for detecting the pressure value between the pressure roller and the metal sheet (2). The two pressure sensors are respectively connected to the controller (9).

10. A control method for a metal sheet polishing machine, characterized in that: The metal sheet polishing machine according to claim 9 is provided with an indicator light (21) on the panel of the machine casing (8). After starting the feed motor (4) and the main motor (6), if the pressure value detected by the first pressure sensor (19) inside the front pressure roller (16) is within the set range S1 after the metal plate (2) contacts the front pressure roller (16), a first qualified detection signal is issued; otherwise, a stop signal is issued, and the controller (9) shuts down the feed motor (4) based on the received stop signal. Taking the time of the first qualified detection signal obtained by the controller (9) as the initial time T0, the time t for the metal plate (2) to be transmitted between the two pressure rollers is calculated according to the transmission speed v of the conveyor belt (3) and the distance between the two pressure rollers. If the second pressure sensor (20) inside the pressure roller (17) does not receive a detection signal within the time interval t+C after the initial time T0, or if the pressure value detected by the second pressure sensor (20) is less than the set range S2, a termination signal is issued. The controller (9) shuts down the main motor (6) and the feed motor (4) based on the termination signal. Otherwise, a second detection pass signal is issued, where C is a set time constant. The controller (9) controls the indicator light (21) to give different light prompts when the controller (9) receives the first detection pass signal, the second detection pass signal, the stop signal and the termination signal.

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