Push rod structure for preventing overload mistaken touch and control method

Abstract

The invention discloses an overload mistaken touch prevention push rod structure and a control method, and relates to the technical field of plasma cleaning machines, the overload mistaken touch prevention push rod structure comprises at least one material pushing assembly, the material pushing assembly comprises a plate, and the plate is provided with a pressure sensor; the push rod can be horizontally connected to the plate in a sliding manner, and the extension direction of one end of the push rod is opposite to the sensing surface of the pressure sensor; one end of the elastic part is arranged on the plate, the other end of the elastic part abuts against or is connected with the other end of the push rod, and the elastic part is used for providing extrusion force for the push rod to move to the pressure sensor and abut against the pressure sensor in an initial state; the push rod pushes a product rightwards, the pressure sensor is arranged on the left side of the push rod, the push rod is pre-pressed on the sensor through the elastic piece, gaps are eliminated, pushing force transmission is accelerated, workpiece damage during material clamping is avoided, initial pressure of the elastic piece returns to zero through an upper computer, and when a light product is pushed, the sensor detects net pushing force, and the situation that a protection mechanism is mistakenly triggered is reduced.

Description

Technical Field

[0001] This invention relates to the field of plasma cleaning machine technology, specifically to a push rod structure and control method for preventing accidental overload. Background Technology

[0002] Plasma cleaners use high-energy plasma to treat material surfaces, such as removing oil stains, oxide layers, and improving surface activity. During operation, the product to be cleaned is pushed into the plasma treatment chamber by a pusher device, or the product is removed after treatment.

[0003] In fully automatic plasma cleaners, push rod devices are mainly used for material conveying and other operations. Some push rod devices integrate simple overload protection, but their trigger threshold is factory set and cannot be adjusted. In the existing technology, an elastic component is installed between the push rod device and the pressure sensor. Then the push rod device pushes the product. When the product gets stuck, the push rod device will retract and slide towards the position of the pressure sensor. During this process, the push rod device will gradually squeeze the elastic component. Then, as the elastic component gradually deforms, it gradually transmits the pressure to the pressure sensor. In essence, the elastic component acts as a buffer component of the push rod device, which can protect the push rod device in the event of material jamming. However, due to the deformation buffer stage of the elastic component, the pressure sensor does not respond in time. During this period, the push rod device is still applying the pushing force. By the time the elastic component deforms to the point that the pushing force has reached the threshold and is completely transmitted to the pressure sensor, the push rod device has already damaged the product that is jammed, or even caused the push rod of the push rod device to deform. Summary of the Invention

[0004] The purpose of this invention is to provide a push rod structure that prevents accidental activation due to overload, so as to solve the problems mentioned in the background art.

[0005] Another object of the present invention is to provide a control method.

[0006] To solve the above-mentioned technical problems, the present invention provides a push rod structure to prevent accidental overload, comprising at least one pusher assembly, the pusher assembly comprising, The board has a pressure sensor installed on it; The push rod is horizontally slidably connected to the plate, and the extension direction of one end of the push rod is set opposite to the sensing surface of the pressure sensor; The elastic element, with one end mounted on the plate and the other end abutting or connected to the other end of the push rod, is used to provide the squeezing force for the push rod to move to the pressure sensor and abut against it in the initial state.

[0007] Furthermore, the elastic element includes at least, A telescopic spring, one end of which abuts against or is connected to a plate, and the other end abuts against or is connected to a push rod.

[0008] Furthermore, the elastic element also includes, The guide rod is parallel to the extension direction of the push rod and is mounted on the plate. The push rod is provided with an inwardly recessed guide groove, and the guide rod extends at least partially into the guide groove. One end of the telescopic spring extends into the guide groove and abuts against or connects to the bottom of the groove.

[0009] Furthermore, the plate is also provided with a first guide rail, the guide of the first guide rail is parallel to the extension direction of the push rod, and the push rod is provided with a first slider, which is slidably connected to the first guide rail.

[0010] Furthermore, the sheet metal includes, The fixed plate, on which the push rod is mounted, The front baffle and the rear baffle are respectively located on the left and right sides of the fixed plate; The lower side of the front baffle protrudes at least partially from the side wall of the fixing plate to provide a mounting surface for fixing the guide rod; The lower side of the rear baffle protrudes at least partially from the side wall of the mounting plate to provide a mounting surface for fixing the pressure sensor.

[0011] Furthermore, it also includes a linear module for driving the pusher assembly to move; The linear module includes... The second guide rail and the second slider that are slidably connected thereto, the guide rail being parallel to the extension direction of the push rod; The driving unit, whose driving end is connected to the second slider, is used to drive the second slider to slide along the second guide rail; The pusher assembly is connected to the second slider.

[0012] Furthermore, it also includes a cantilever, the extension direction of which is perpendicular to the extension direction of the push rod. There are multiple feeding components, which are spaced apart on the cantilever.

[0013] Furthermore, a cylinder is provided between the pushing assembly and the cantilever. The telescopic end of the cylinder extends and retracts vertically to drive the pushing assembly to move up and down.

[0014] A control method, applied to any of the above-described anti-overload accidental activation push rod structures, includes the following specific control steps: The initial force applied to the pressure sensor by the elastic element pressing the push rod is reduced to zero through calibration and compensation by the host computer. The maximum thrust threshold F is preset. The thrust F0 of the push rod pushing the product is collected in real time by the pressure sensor. It is determined whether the thrust F0 is greater than the preset maximum thrust threshold F. If F0>F, the set protection action is triggered; if F0≤F, normal operation is performed.

[0015] Compared with the prior art, the beneficial effects of the present invention are: 1. In this invention, the push rod pushes the product to the right, with the pressure sensor on its left and the elastic element on the right. The elastic element applies a force to the left to the push rod, pressing the push rod against the pressure sensor, eliminating the gap between the push rod and the pressure sensor, and making the force-bearing end of the push rod contact the pressure sensor, thus accelerating the transmission of the thrust. The initial pressure of the elastic element is reset to zero by the host computer. When pushing a light product, the sensor detects the net thrust, reducing the possibility of false triggering of the protection mechanism.

[0016] 2. In this invention, the guide rod constrains the top pressure direction of the telescopic spring, reducing the lateral force component, so that the force on the push rod is transmitted to the pressure sensor more completely. The telescopic spring presses against the push rod along the guide direction, reducing its sliding resistance, resulting in a faster response and timely triggering of protection when jammed. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the connection structure between the cylinder and the fixed plate in this invention; Figure 3 This is a schematic diagram of the connection structure between the fixing plate and the front baffle in this invention; Figure 4 This is a schematic diagram of the connection structure between the push rod and the first slider in this invention; Figure 5 This is a cross-sectional schematic diagram of the push rod in this invention; Figure 6 This is a flowchart of the control method in this invention; In the diagram: 1. Linear module; 101. Second guide rail; 102. Second slider; 103. Servo motor; 104. Cantilever; 105. Cylinder; 2. Feeding assembly; 201. Push rod; 2011. Feeding end; 2012. Extrusion end; 2013. Fixed end; 202. Fixed plate; 203. Front baffle; 204. Rear baffle; 3. Pressure sensor; 301. Sensing surface; 4. Elastic components; 41. Extension springs; 5. Guide rod; 6. First guide rail; 7. First slider; 8. Guide groove. Detailed Implementation

[0018] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0019] This invention provides a technical solution: See Figures 1-6 As shown, a push rod structure for preventing accidental overload activation includes at least one pusher assembly 2, which includes: The plate is equipped with a pressure sensor 3. The push rod 201 is horizontally slidably connected to the plate, and the extension direction of one end of the push rod 201 is opposite to the sensing surface 301 of the pressure sensor 3. The elastic element 4 has one end set on the plate and the other end abutting or connected to the other end of the push rod 201. It is used to provide the push rod 201 with the compressive force to move to the pressure sensor 3 and abut against it in the initial state.

[0020] Please pay close attention. Figure 4 and Figure 5 The pusher assembly 2 moves to the right, meaning that the pusher 201 will push the product to the right. Therefore, the pressure sensor 3 is located on the left side of the pusher 201. When the pusher 201 pushes the product to the right and generates resistance, this force will be transmitted to the pressure sensor 3 on the left side of the pusher 201. The left end of the pusher 201 protrudes upward, and the pressure sensor 3 is located on the left side of the protrusion. The elastic element 4 is located above the pusher 201 and on the right side of the protrusion. The elastic element 4 pushes the pusher 201 towards the pressure sensor 3, so that the left end of the pusher 201 continuously contacts the pressure sensor 3. When the push rod 201 is pre-pressed onto the pressure sensor 3 by the elastic element 4, the push rod 201 and the pressure sensor 3 always maintain a gapless contact. The force transmission path is in an active state from the beginning of the push. Once the workpiece gets stuck and the pushing force increases, the force will be instantly transmitted to the pressure sensor 3 through the push rod 201, triggering the shutdown with almost no delay, minimizing the risk of workpiece damage. The preload of the elastic element 4 will always subject the pressure sensor 3 to an initial pressure. The host computer will reset this initial pressure to zero. Even if the push rod 201 undergoes a slight displacement due to slight vibration or track friction, the contact state between the push rod 201 and the pressure sensor 3 will not change. This is because the elastic element 4 has eliminated the gap between the push rod 201 and the pressure sensor 3, thus avoiding false signals caused by accidental contact. When pusher 201 pushes a light product, the reaction force on pusher 201 will be superimposed on the initial pressure. However, since the initial force is zero, the pressure sensor 3 detects the net pushing force at this time. For example, if the initial pressure applied by elastic element 4 is 5N, and the reaction force when pushing a light product is 2N, the actual detection value of pressure sensor 3 is 5N + 2N - 5N = 2N. If the set overload threshold is 5N, the machine will not be triggered to stop, thus avoiding misjudgment. The appropriate elastic element 4 can be selected according to the force required to push the product, such as the appropriate stiffness and preload. This can further protect the product and reduce false triggering of the protection mechanism. At the same time, since the equipment has integrated overload protection after leaving the factory, its trigger threshold is set by the factory and cannot be adjusted. Therefore, by replacing the elastic element 4 with different stiffness or preload, the product can be protected from damage and the trigger threshold can be protected from excessive false triggering.

[0021] See Figures 2-5 The elastic element 4 includes at least the following: The telescopic spring 41 has one end abutting or connected to the plate, and the other end abutting or connected to the push rod 201.

[0022] One end of the telescopic spring 41 is fixed to the plate, and the other end is connected to the push rod 201. The telescopic spring 41 is set along the movement axis of the push rod 201. It generates a continuous preload through its own elastic deformation, which firmly presses the push rod 201 against the pressure sensor 3. This preload can be controlled by the selection of the telescopic spring 41, such as stiffness and length, so that the contact will not be loose due to insufficient force. The preload of the telescopic spring 41 is more stable.

[0023] See Figures 4-5 The elastic element 4 also includes, Guide rod 5 is parallel to the extension direction of push rod 201 and is mounted on the plate; The push rod 201 is provided with an inwardly recessed guide groove 8, and the guide rod 5 extends at least partially into the guide groove 8. One end of the telescopic spring 41 extends into the guide groove 8 and abuts against or connects to the bottom of the groove.

[0024] The direction of movement of push rod 201 is the direction of direct force application. Only the force along this direction needs to be detected by pressure sensor 3. The guiding direction of guide rod 5 is consistent with the direction of movement of push rod 201, and also makes the direction of force application consistent. Guide rod 5 further constrains the top pressure of telescopic spring 41. In this way, the pushing force on push rod 201 will be transmitted to pressure sensor 3 more completely, reducing the lateral component force, and also limiting the top pressure of telescopic spring 41 from deflecting. The guide rod 5 restricts the top pressure direction of the telescopic spring 41, reducing the possibility of the telescopic spring 41 exerting lateral top pressure. The telescopic spring 41 presses against the push rod 201 along the guiding direction of the guide rod 5. This minimizes the movement resistance and maximizes the response speed when the push rod 201 slides. For example, if the workpiece gets stuck, the push rod 201 can slide towards the pressure sensor 3 more quickly, triggering the protection in time. The preload of the telescopic spring 41 acts more axially on the pressure sensor 3, and when the push rod 201 is stationary or pushing a light workpiece, the deformation of the telescopic spring 41 always remains axially stable. This means that the computer's initial force zeroing has a stable reference value, which can more accurately distinguish between preload and workpiece resistance. One end of the guide rod 5 extends to the left into the guide groove 8. The left end of the guide rod 5 is the extension end, that is, the end that extends into the guide groove 8. Moreover, the outer wall of the guide rod 5 does not contact the inner wall of the guide groove 8, reducing contact and friction. The guide rod 5 only limits the pressing direction of the telescopic spring 41, but the guide groove 8 can limit the swaying amplitude of the guide rod 5, preventing the guide rod 5 from producing an excessive swaying amplitude. The left end of the telescopic spring 41 extends into the guide groove 8, which further constrains the lateral deformation of the telescopic spring 41. At the same time, the guide groove 8 further constrains the pushing force of the telescopic spring 41, the guide rod 5, and the push rod 201 to be in the same direction, which greatly improves the overall motion stability.

[0025] See Figures 4-5 The plate is also provided with a first guide rail 6, the guide of the first guide rail 6 is parallel to the extension direction of the push rod 201, and a first slider 7 is provided on the push rod 201, the first slider 7 is slidably connected to the first guide rail 6.

[0026] The upward protruding part at the left end of the push rod 201 forms a fixed end 2013, which is fixedly connected to the bottom of the first slider 7. Since the pressure sensor 3 is on the left side of the push rod 201, the initial position of the first slider 7 is on the left side of the first guide rail 6, close to the pressure sensor 3. The push rod 201 is slidably connected to the first guide rail 6 through the first slider 7. In this way, after the push rod 201 senses resistance, it can slide slightly to the left and increase the pushing force applied to the pressure sensor 3. If the push rod 201 is in a fixed state, the increased pushing force cannot be fully applied to the pressure sensor 3. Multiple steel balls can be installed inside the first slider 7 to ensure that the rolling elements are arranged in an orderly manner and do not rub against each other, thus converting the friction between the first slider 7 and the first guide rail 6 into rolling friction of the rolling elements, further reducing friction. At the same time, grease is injected into the slide of the first guide rail 6 to continuously lubricate the contact surface between the rolling elements and the slide, reducing wear and avoiding dry friction jamming.

[0027] See Figures 2-5 The sheet metal includes, The fixed plate 202 and the push rod 201 are mounted on the fixed plate 202. The front baffle 203 and the rear baffle 204 are respectively disposed on the left and right sides of the fixed plate 202; The lower side of the front baffle 203 protrudes at least partially from the side wall of the fixing plate 202 to provide a mounting surface for fixing the guide rod 5. The lower side of the rear baffle 204 protrudes at least partially from the side wall of the mounting plate 202 to provide a mounting surface for fixing the pressure sensor 3.

[0028] Please pay close attention. Figure 4 and Figure 5 In the middle, the front baffle 203 is fixed to the right side wall of the fixed plate 202, and the rear baffle 204 is fixed to the left side wall of the fixed plate 202. The bottom ends of the front baffle 203 and the rear baffle 204 extend downward and protrude from the bottom of the fixed plate 202. The fixed end 2013 of the push rod 201 protruding upward is fixedly connected to the bottom of the first slider 7. The first slider 7 and the fixed end 2013 are close to the pressure sensor 3. The left side wall of the front baffle 203 is fixedly connected to the telescopic spring 41 and the right end of the guide rod 5 to provide stable support force. The rear baffle 204 is wider than the front baffle 203, so the pressure sensor 3 is fixedly installed inside the rear baffle 204. The rear baffle 204 provides stable support for the pressure sensor 3, which is conducive to the push rod 201 applying pressure to the pressure sensor 3. The first guide rail 6 is fixedly installed at the bottom of the fixed plate 202 and is located between the front baffle 203 and the rear baffle 204. The right end of the push rod 201 is the push end 2011, which extends to the right beyond the front baffle 203. The pusher end 2011 is responsible for contacting and pushing the product, and the left end of the push rod 201 is the extrusion end 2012, which is used to abut against the pressure sensor 3. exist Figure 5 As can be seen from the cross-sectional view, the sensing surface 301 of the pressure sensor 3 protrudes towards the push rod 201 and protrudes beyond the surface of the pressure sensor 3 to abut against the extrusion end 2012. The pressure sensor 3 is fixed inside the rear baffle 204. The sensing surface 301 is located on the right side of the pressure sensor 3 and extends to the right until it abuts against the extrusion end 2012. Moreover, when the extrusion end 2012 and the sensing surface 301 have already abutted against each other, there is a gap between the left side of the rear baffle 204 and the extrusion end 2012. This is to prevent the increased thrust caused by the push rod 201 pushing the stuck product. If the sensing surface 301, pressure sensor 3, and back baffle 204 are on the same plane, the pressure that the extrusion end 2012 should apply to the sensing surface 301 will be partially applied to the outer wall of pressure sensor 3 and back baffle 204, resulting in incomplete force for direct detection. The gap between the baffle 204 and the extrusion end 2012 provides space for the slight sliding after the extrusion end 2012 applies pressure, so that the pushing force can be transmitted more completely and directly to the sensing surface 301.

[0029] See Figure 5 It also includes a linear module 1 for driving the pusher assembly 2 to move; Linear module 1 includes, The second guide rail 101 and the second slider 102 slidably connected thereto, the guide of the second guide rail 101 being parallel to the extension direction of the push rod 201; The driving unit, whose driving end is connected to the second slider 102, is used to drive the second slider 102 to slide along the second guide rail 101; The pusher assembly 2 is connected to the second slider 102.

[0030] The drive unit applies a driving force to the linear module 1, so that the second slider 102 can move laterally along the second guide rail 101. Then, the second slider 102 drives the pusher assembly 2 to move horizontally. The direction of movement is the direction in which the push rod 201 pushes the product to move. The drive unit adopts a combination transmission mechanism of servo motor 103 and lead screw. The servo motor 103 drives the lead screw to rotate, and then the second slider 102, which is threaded on the lead screw, slides, so that the second slider 102 and the pusher assembly 2 can move.

[0031] See Figure 5 It also includes a cantilever 104, the extension direction of which is perpendicular to the extension direction of the push rod 201. Multiple pusher components 2 are spaced apart on the cantilever 104.

[0032] One end of the cantilever 104 is fixedly connected to the top of the second slider 102. Multiple sets of pusher components 2 are spaced apart at the same distance and fixed together at the bottom of the cantilever 104. This can evenly distribute the total load to multiple action points, greatly reducing the load on a single push rod 201, and also protecting the product. When the second slider 102 moves, it drives the cantilever 104, so that the cantilever 104 can move horizontally along the linear module 1. The movement of the cantilever 104 can drive multiple sets of pusher components 2 to push the product together and apply force together.

[0033] See Figure 5 A cylinder 105 is provided between the pusher assembly 2 and the cantilever 104. The telescopic end of the cylinder 105 extends and retracts vertically to drive the pusher assembly 2 to move up and down.

[0034] The cylinder 105 is fixedly installed at the bottom of the cantilever 104. The telescopic end of the cylinder 105 is fixedly connected to the top of the fixed plate 202. The cylinder 105 is used to drive the pusher assembly 2 to move vertically, adjust the pusher assembly 2 to move up or down, so that the push rod 201 is aligned with the product, and then accurately push the product. When cylinder 105 is raised, it allows material to pass through; when cylinder 105 is lowered, it pushes material forward. When there are multiple pusher components 2 depending on the number of product transmission tracks, multiple pusher components 2 can simultaneously detect the overload of multiple sets of products. When any one or more pusher components 2 are overloaded, protection actions can be triggered immediately, such as stopping the motor, reversing and retracting, or issuing an alarm.

[0035] See Figures 1-6 The present invention also provides a control method for an overload-prevention push rod structure in any of the above embodiments, the specific control steps of which include: Through calibration and compensation by the host computer, the initial force applied to the pressure sensor 3 by the elastic element 4 pressing the push rod 201 is reduced to zero; The maximum thrust threshold F is preset. The thrust F0 of the push rod 201 pushing the product is collected in real time by the pressure sensor 3. It is determined whether the thrust F0 is greater than the preset maximum thrust threshold F. If F0>F, the set protection action is triggered; if F0≤F, normal operation is performed. The process steps are as follows: 1. Parameter settings: Users can set the maximum thrust threshold in the HMI according to different process formulations based on the workpiece type, such as lead frame / metal carrier; For example, the lead frame is set at 15N, the metal carrier at 80N, and the protection response time is usually ≤10ms; 2. Thrust generation and transmission: Servo motor 103 receives commands from controller and outputs precise torque, which is converted into linear thrust by linear module 1. The thrust pushes the carrier or lead frame product through push rod 201. 3. Real-time force monitoring: Pressure sensor 3 continuously collects the actual thrust value at a sampling rate of ≥1kHz and feeds the data back to the host computer in real time, for example, the current thrust is 12.3N; 4. After overload detection, take appropriate action.

Claims

1. A push rod structure to prevent accidental overload activation, comprising at least one pusher assembly, characterized in that, The pusher assembly includes, The board has a pressure sensor installed on it; The push rod is horizontally slidably connected to the plate, and the extension direction of one end of the push rod is set opposite to the sensing surface of the pressure sensor; The elastic element, with one end mounted on the plate and the other end abutting or connected to the other end of the push rod, is used to provide the squeezing force for the push rod to move to the pressure sensor and abut against it in the initial state.

2. The push rod structure for preventing accidental overload as described in claim 1, characterized in that: The elastic element includes at least the following: A telescopic spring, one end of which abuts against or is connected to a plate, and the other end abuts against or is connected to a push rod.

3. The push rod structure for preventing accidental overload as described in claim 2, characterized in that: Elastic components also include, The guide rod is parallel to the extension direction of the push rod and is mounted on the plate. The push rod is provided with an inwardly recessed guide groove, and the guide rod extends at least partially into the guide groove. One end of the telescopic spring extends into the guide groove and abuts against or connects to the bottom of the groove.

4. The push rod structure for preventing accidental overload activation as described in claim 3, characterized in that: The plate is also provided with a first guide rail, the guide of the first guide rail is parallel to the extension direction of the push rod, and the push rod is provided with a first slider, which is slidably connected to the first guide rail.

5. The push rod structure for preventing accidental overload as described in claim 4, characterized in that: The sheet metal includes, The fixed plate, on which the push rod is mounted, The front baffle and the rear baffle are respectively located on the left and right sides of the fixed plate; The lower side of the front baffle protrudes at least partially from the side wall of the fixing plate to provide a mounting surface for fixing the guide rod; The lower side of the rear baffle protrudes at least partially from the side wall of the mounting plate to provide a mounting surface for fixing the pressure sensor.

6. The push rod structure for preventing accidental overload activation as described in claim 1, characterized in that: It also includes a linear module for driving the pusher assembly to move; The linear module includes... The second guide rail and the second slider that are slidably connected thereto, the guide of the second guide rail being parallel to the extension direction of the push rod; The driving unit, whose driving end is connected to the second slider, is used to drive the second slider to slide along the second guide rail; The pusher assembly is connected to the second slider.

7. The push rod structure for preventing accidental overload as described in claim 6, characterized in that: It also includes a cantilever, the extension direction of which is perpendicular to the extension direction of the push rod. There are multiple feeding components, which are spaced apart on the cantilever.

8. The push rod structure for preventing accidental overload activation as described in claim 7, characterized in that: A cylinder is installed between the pusher assembly and the cantilever. The telescopic end of the cylinder extends and retracts vertically to drive the pusher assembly to move up and down.

9. A control method, characterized in that: The push rod structure for preventing overload accidental activation as described in any one of claims 1-8 includes the following specific control steps: The initial force applied to the pressure sensor by the elastic element pressing the push rod is reduced to zero through calibration and compensation by the host computer. The maximum thrust threshold F is preset. The thrust F0 of the push rod pushing the product is collected in real time by the pressure sensor. It is determined whether the thrust F0 is greater than the preset maximum thrust threshold F. If F0>F, the set protection action is triggered; if F0≤F, normal operation is performed.

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