Nut continuous thickness quality inspection and blanking equipment

Abstract

The utility model relates to nut thickness quality inspection technical field, concretely relates to a nut continuous formula thickness quality inspection blanking equipment. The upper side wall of base is fixedly installed with the chute of incline setting through support rod, the inside of chute is provided with the baffle of incline setting. The utility model discloses, when the micro strain sensor detects the slight pressure change of nut jamming and continues preset time, controls the equipment to make the electromagnet electrification adsorption thick iron sheet immediately, drives the movable plate and baffle to overcome the reset spring elasticity and moves up fast, temporarily expands the gap and releases the jamming nut, and then the electromagnet is de-energized, and the reset spring pushes the baffle and resets momentarily, and the design ensures that all nuts can successfully blank, avoids the action of releasing the jamming nut through the frequent extension and retraction of servo cylinder piston rod, slows down the wear speed of the internal parts of servo cylinder, prolongs the service life of servo cylinder.

Description

Technical Field

[0001] This utility model relates to the field of nut thickness quality inspection technology, specifically to a continuous nut thickness quality inspection and unloading device. Background Technology

[0002] In existing technologies, baffles are commonly used to detect the thickness of nuts. The structural principle is to set a baffle of fixed height in an inclined slide, so that the lower edge of the baffle and the bottom side of the slide form a gap that matches the thickness of qualified products. Qualified nuts pass through the gap and fall into the qualified box, while overly thick nuts are blocked by the baffle and guided into the defective box by the material distribution chute.

[0003] However, this structure has a significant drawback: when a nut with a slightly excessive thickness weds into the gap of the baffle under the impact of movement, it will get stuck due to friction. For example, a nut with a maximum thickness of 10.1mm (tolerance ±0.1mm) will get stuck if it enters an area with a minimum actual gap of only 9.95mm (the baffle gap is nominally 10.0mm, tolerance ±0.05mm). To release the stuck nut, the baffle needs to be raised. In order to adapt to the detection requirements of nuts with different thicknesses, the baffle is usually driven by a high-precision servo cylinder to achieve precise adjustment of the gap. The release operation requires driving the servo cylinder to extend and retract its piston rod. Frequent execution of this lifting action will cause the precision parts inside the servo cylinder (such as lead screws and bearings) to wear out faster, which will lead to a decrease in adjustment accuracy, a shortened equipment life, and increased maintenance costs. This problem makes it difficult to meet the requirements of industrial scenarios for high durability and operational stability of equipment. Summary of the Invention

[0004] The purpose of this invention is to provide a continuous thickness quality inspection and blanking device for nuts, so as to solve the problems mentioned in the background art above:

[0005] Frequent extension and retraction of the piston rod in a servo electric cylinder can lead to accelerated wear of the precision parts inside the cylinder, resulting in decreased adjustment accuracy and shortened equipment lifespan.

[0006] To address the above problems, the present invention aims to provide a continuous thickness quality inspection and blanking device for nuts, comprising a base, an inclined slide rail fixedly mounted on the upper side wall of the base via a support rod, an inclined baffle plate disposed inside the slide rail, a gap adapted to the thickness of a qualified nut being left between the lower side wall of the baffle plate and the bottom side of the slide rail, and a material distribution groove provided on the slide rail at a position corresponding to the lower side of the baffle plate. An assembly frame is fixedly mounted on the upper side wall of the slide rail, and a height adjustment mechanism is provided on the assembly frame. The height adjustment mechanism is used to drive the baffle plate to move up and down. When the workpiece is stuck between the lower side wall of the baffle plate and the bottom side of the slide rail, the height adjustment mechanism drives the baffle plate to move upward, so that the baffle plate is away from the bottom side of the slide rail.

[0007] As a further improvement to this technical solution, the height adjustment mechanism includes a servo electric cylinder fixedly installed on the top of the assembly frame, and the piston rod of the servo electric cylinder slides through the upper side wall of the assembly frame and is fixedly connected to a lifting plate.

[0008] As a further improvement to this technical solution, sliding rods are fixedly installed on the lower side wall of the lifting plate near the four corners, and a movable plate is fixedly installed on the upper side wall of the baffle. The lower ends of the four sliding rods slide through the movable plate and are fixedly connected with end caps.

[0009] As a further improvement to this technical solution, a return spring is sleeved on the outer side of the slide rod. The two ends of the return spring are in contact with the lower side wall of the lifting plate and the upper side wall of the movable plate, respectively. Under normal conditions, the return spring pushes the movable plate away from the lifting plate, so that the lower side wall of the movable plate contacts the upper side wall of the end cap.

[0010] As a further improvement to this technical solution, an electromagnet is fixedly installed at the middle position of the lower side wall of the lifting plate, and a thick iron plate is fixedly installed at the position corresponding to the electromagnet on the upper side wall of the movable plate. When the electromagnet is energized, the electromagnet attracts the thick iron plate and moves upward, so that the movable plate overcomes the elastic force of the return spring and moves away from the inner bottom side of the slide.

[0011] As a further improvement to this technical solution, a micro-strain sensor is fixedly installed on the assembly frame, and the detection end of the micro-strain sensor is in contact with the side of the baffle near the lower end of the slide.

[0012] As a further improvement to this technical solution, a collection box is installed on the upper side wall of the base via a bracket, and the collection box is located directly below the material distribution trough.

[0013] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0014] 1. This continuous thickness quality inspection and blanking equipment for nuts, when the micro-strain sensor detects a small pressure change caused by nut jamming and continues for a preset time, the control equipment immediately energizes the electromagnet to attract the thick iron sheet, causing the movable plate and baffle to move quickly upward against the spring force of the return spring, temporarily widening the gap to release the jammed nut. Subsequently, the electromagnet is de-energized, and the return spring pushes the baffle to instantly reset. This design ensures that all nuts can be smoothly blanked, and avoids the frequent action of releasing the jammed nut by extending and retracting the piston rod of the servo cylinder, thus slowing down the wear rate of the internal parts of the servo cylinder and extending the service life of the servo cylinder. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0016] Figure 2 For the present utility model Figure 1 Enlarged view of the structure at point A in the middle;

[0017] Figure 3 This is a schematic diagram of the baffle and height adjustment mechanism of this utility model;

[0018] Figure 4 For the present utility model Figure 3 A sectional view;

[0019] Figure 5 This is a schematic diagram of the structure of the baffle, movable plate and sheet metal of this utility model.

[0020] The meanings of the labels in the diagram are as follows:

[0021] 1. Base;

[0022] 2. Slide rail; 21. Material distribution chute;

[0023] 3. Baffle; 4. Collection box; 5. Assembly rack;

[0024] 6. Height adjustment mechanism; 61. Servo electric cylinder; 62. Lifting plate; 63. Slide rod; 64. Movable plate; 65. Thick iron sheet; 66. Electromagnet; 67. End cap; 68. Return spring;

[0025] 7. Micro-strain sensor. Detailed Implementation

[0026] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model. Example

[0027] Please see Figure 1 As shown, the purpose of this embodiment is to provide a continuous thickness quality inspection and unloading device for nuts, including a base 1. The upper side wall of the base 1 is fixedly installed with an inclined slide 2 by a support rod. In use, a receiving box is placed at the bottom of the slide 2. Nuts on the production line can slide down the bottom side of the slide 2 and finally fall into the receiving box, thus achieving safe unloading.

[0028] An inclined baffle 3 is installed inside the slide 2. A gap is left between the lower side wall of the baffle 3 and the bottom side of the slide 2, which is adapted to the thickness of the qualified nut. A material distribution groove 21 is opened on the slide 2 at the position corresponding to the lower side of the baffle 3. A collection box 4 is installed on the upper side wall of the base 1 by a bracket. The collection box 4 is located directly below the material distribution groove 21. Nuts with qualified thickness can slide down through the gap between the baffle 3 and the bottom side of the slide 2 and directly enter the collection box. Nuts with excessive thickness will be blocked by the baffle 3 and slide along the inclined surface of the baffle 3. Finally, they fall into the collection box 4 below through the material distribution groove 21. Thus, the equipment realizes the thickness quality inspection of nuts simultaneously during the continuous feeding process and automatically separates qualified and unqualified products.

[0029] During the thickness detection process, nuts with a thickness slightly larger than the set gap are easily forced into the gap formed between the baffle 3 and the bottom side of the slide 2 under sliding impact. Due to the excessive friction generated by the wedging effect, they become stuck. The stuck nuts will hinder the dropping of subsequent nuts. To solve this problem, an assembly frame 5 is fixedly installed on the upper side wall of the slide 2. The assembly frame 5 is equipped with a height adjustment mechanism 6. The height adjustment mechanism 6 is used to drive the baffle 3 to move up and down. When the workpiece is stuck between the lower side wall of the baffle 3 and the inner bottom side of the slide 2, the height adjustment mechanism 6 drives the baffle 3 to move upward, so that the baffle 3 is away from the inner bottom side of the slide 2, temporarily widening the gap between the baffle 3 and the bottom side of the slide 2, so as to release the stuck nut, allowing it to pass and fall into the receiving box. After the dropping is completed, the height adjustment mechanism 6 quickly drives the baffle 3 to reset, restoring its thickness detection function.

[0030] It should be noted that the movement and reset of the baffle 3 are completed in a very short time. At the same time, a certain gap is maintained between the nuts sliding on the slide 2. Therefore, during the temporary widening of the gap between the baffle 3 and the bottom side of the slide 2, other nuts will not fall into the receiving box without being detected through the gap, thus ensuring that all nuts can pass through the thickness detection of the baffle 3.

[0031] The following details the structure of the height adjustment mechanism 6, referring to... Figures 3-5The height adjustment mechanism 6 includes a servo electric cylinder 61 fixedly installed on the top of the assembly frame 5. The servo electric cylinder 61 is a commercially available high-precision product, and its working principle will not be described in detail here. The piston rod of the servo electric cylinder 61 slides through the upper side wall of the assembly frame 5 and is fixedly connected to a lifting plate 62. Slide rods 63 are fixedly installed on the lower side wall of the lifting plate 62 near the four corners. A movable plate 64 is fixedly installed on the upper side wall of the baffle 3. The lower ends of the four slide rods 63 slide through the movable plate 64 and are fixedly connected to end caps 67. This structure allows the movable plate 64 to move up and down only along the axis of the slide rods 63. A return spring 68 is sleeved on the outside of the slide rods 63. The two ends of the return spring 68 contact the lower side wall of the lifting plate 62 and the upper side wall of the movable plate 64, respectively. Under normal conditions, the return spring 68 pushes the movable plate 64 away from the lifting plate 62, so that the lower side wall of the movable plate 64 contacts the upper side wall of the end cap 67.

[0032] When the piston rod of the servo electric cylinder 61 extends and retracts, it drives the lifting plate 62 to move up and down. The lifting plate 62 drives the movable plate 64 to move synchronously through the slide rod 63 and the end cap 67. The movable plate 64 then drives the baffle 3 to move synchronously, thereby adjusting the gap between the baffle 3 and the bottom side of the slide 2 so that it can adapt to the detection requirements of nuts of different thicknesses.

[0033] However, it should be noted that because there are many nuts during the inspection process, if the piston rod of the servo cylinder 61 is frequently retracted to move the baffle 3 upward to release the stuck nuts, the servo cylinder 61 is prone to a decrease in adjustment accuracy due to wear of internal parts. To solve this problem, an electromagnet 66 is fixedly installed in the middle of the lower side wall of the lifting plate 62, and a thick iron plate 65 is fixedly installed on the upper side wall of the movable plate 64 at the position corresponding to the electromagnet 66.

[0034] Simultaneously refer to Figure 2 A micro-strain sensor 7 with programmable function is fixedly installed on the assembly frame 5. The micro-strain sensor 7 is in contact with the side of the baffle 3 near the lower end of the slide 2. The micro-strain sensor 7 can monitor the pressure applied to it by the baffle 3 in real time. The micro-strain sensor 7 is a commercially available mature product, and its working principle will not be described in detail here. Both the micro-strain sensor 7 and the electromagnet 66 are electrically connected to the external control device.

[0035] When the nut gets stuck in the gap between the baffle 3 and the bottom of the slide 2, the nut will exert a pushing force on the baffle 3, causing the pressure exerted by the baffle 3 on the micro-strain sensor 7 to increase slightly. After this slight pressure change is detected by the micro-strain sensor 7, if the pressure increase continues for more than the preset time in the internal program of the micro-strain sensor 7 (this preset time is greater than the time required for the nut with excessive thickness to slide along the inclined surface of the baffle 3 and fall out of the slide 2 through the material distribution groove 21), it is determined that there is a nut stuck. The micro-strain sensor 7 then sends an electrical signal to the control device. After receiving this signal, the control device immediately energizes the electromagnet 66. The energized electromagnet 66 attracts the thick iron sheet 65, overcomes the elastic force of the return spring 68, and drives the movable plate 64 to move upward and approach the lifting plate 62. At this time, the gap between the movable plate 64 and the lifting plate 62 is shortened, the return spring 68 is compressed and contracted, and the movable plate 64 drives the baffle 3 to move upward synchronously, thereby temporarily widening the gap between it and the bottom of the slide 2 and releasing the stuck nut.

[0036] When the retaining nut disengages from the baffle 3, the pressure applied by the baffle 3 to the micro-strain sensor 7 returns to normal. The micro-strain sensor 7 then sends an electrical signal to the control device. Upon receiving this signal, the control device immediately de-energizes the electromagnet 66. The electromagnet 66 loses its magnetic force and no longer attracts the thick iron sheet 65. At this instant, the compressed return spring 68 quickly rebounds, pushing the movable plate 64 downward until its lower sidewall contacts the upper sidewall of the end cap 67 again, thus completing the rapid reset of the movable plate 64 and the baffle 3 and restoring the thickness detection function of the baffle 3.

[0037] It should be noted that the control device controls the on / off state of the electromagnet 66 based on the data detected by the micro-strain sensor 7, which is existing technology and will not be described in detail here. At the same time, the lifting plate 62, the slide rod 63, the movable plate 64, the end cap 67 and the return spring 68 are all made of composite materials that do not have ferromagnetism and are not affected by the magnetic force of the electromagnet 66.

[0038] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A continuous thickness quality inspection and blanking device for nuts, comprising a base (1), characterized in that: The upper side wall of the base (1) is fixedly installed with an inclined slide (2) by a support rod. An inclined baffle (3) is provided inside the slide (2). A gap matching the thickness of the qualified nut is left between the lower side wall of the baffle (3) and the bottom side inside the slide (2). A material distribution groove (21) is opened on the slide (2) at the position corresponding to the lower side of the baffle (3). An assembly frame (5) is fixedly installed on the upper side wall of the slide (2). A height adjustment mechanism (6) is provided on the assembly frame (5). The height adjustment mechanism (6) is used to drive the baffle (3) to move up and down. When the workpiece is stuck between the lower side wall of the baffle (3) and the bottom side inside the slide (2), the height adjustment mechanism (6) drives the baffle (3) to move upward, so that the baffle (3) is away from the bottom side inside the slide (2).

2. The continuous thickness quality inspection and blanking equipment for nuts according to claim 1, characterized in that: The height adjustment mechanism (6) includes a servo electric cylinder (61) fixedly installed on the top of the assembly frame (5). The piston rod of the servo electric cylinder (61) slides through the upper side wall of the assembly frame (5) and is fixedly connected to a lifting plate (62).

3. The continuous thickness quality inspection and blanking equipment for nuts according to claim 2, characterized in that: The lower side wall of the lifting plate (62) is fixedly equipped with sliding rods (63) near the four corners. The upper side wall of the baffle (3) is fixedly equipped with a movable plate (64). The lower ends of the four sliding rods (63) slide through the movable plate (64) and are fixedly connected with end caps (67).

4. The continuous thickness quality inspection and blanking equipment for nuts according to claim 3, characterized in that: A return spring (68) is sleeved on the outer side of the slide rod (63). The two ends of the return spring (68) are in contact with the lower side wall of the lifting plate (62) and the upper side wall of the movable plate (64), respectively. Under normal conditions, the return spring (68) pushes the movable plate (64) away from the lifting plate (62), so that the lower side wall of the movable plate (64) contacts the upper side wall of the end cap (67).

5. The continuous thickness quality inspection and blanking equipment for nuts according to claim 4, characterized in that: An electromagnet (66) is fixedly installed in the middle of the lower side wall of the lifting plate (62), and a thick iron plate (65) is fixedly installed in the upper side wall of the movable plate (64) at the position corresponding to the electromagnet (66). When the electromagnet (66) is energized, the electromagnet (66) attracts the thick iron plate (65) and moves upward, so that the movable plate (64) overcomes the elastic force of the return spring (68) and moves away from the inner bottom side of the slide (2).

6. The continuous thickness quality inspection and blanking equipment for nuts according to claim 1, characterized in that: A micro-strain sensor (7) is fixedly installed on the assembly frame (5), and the detection end of the micro-strain sensor (7) is in contact with the side of the baffle (3) near the lower end of the slide (2).

7. The continuous thickness quality inspection and blanking equipment for nuts according to claim 1, characterized in that: A collection box (4) is mounted on the upper side wall of the base (1) via a bracket, and the collection box (4) is located directly below the material distribution trough (21).

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