An automatic detection device for threaded holes

Abstract

This invention belongs to the field of thread inspection, specifically an automatic thread inspection device, including a mounting base, a slide, a mounting base, a mounting plate, a tightening drive, a tightening head assembly, a detection assembly, and a guide assembly. The mounting plate and the mounting base are connected by several sets of guide assemblies. The tightening head assembly and the tightening drive are respectively connected to the mounting plate, and the tightening head assembly is driven by the drive end of the tightening drive. This invention, through the adaptive design of the tightening head assembly, can effectively adapt to situations where the threaded hole and axial direction are different, allowing the thread inspection piece to be smoothly screwed into the product's thread. Furthermore, by setting up the detection assembly, the depth to which the thread inspection piece is screwed into the product's threaded end face is detected, and then the thread's quality is determined by two parameters: torque and distance. This invention has the advantages of automatic centering and alignment, thus enabling better automatic inspection of threaded parts, with higher inspection efficiency and more accurate and stable inspection results.

Description

Technical Field

[0001] This invention belongs to the field of thread inspection, specifically an automatic thread inspection device. Background Technology

[0002] The machining quality of threads is a crucial factor determining the reliability of threaded connections. In industries with high precision requirements, such as the military industry, the thread quality of each product must be inspected. Currently, thread inspection is mostly done manually, which is not only inefficient but also prone to errors due to the reliance on manual judgment. Summary of the Invention

[0003] To address the above-mentioned problems, the present invention aims to provide an automatic detection device for threaded holes.

[0004] The objective of this invention is achieved through the following technical solution:

[0005] An automatic thread detection device includes a mounting base, a slide, a mounting base, a mounting plate, a tightening drive, a tightening head assembly, a detection assembly, and a guide assembly.

[0006] The slide is slidably connected to the mounting base and driven by the slide drive component. The mounting base is mounted on the slide. The mounting plate and the mounting base are connected by several sets of guide components. The detection component is connected to the mounting plate and the mounting base respectively. The tightening head assembly and the tightening drive component are connected to the mounting plate respectively. The tightening head assembly is driven by the drive end of the tightening drive component.

[0007] The tightening head assembly includes a tightening shaft bearing seat, a tightening shaft, a centering connecting shaft, a thread detection component, a return spring A, an outer positioning bushing, and a centering pressure cap.

[0008] The tightening shaft bearing seat is mounted on the mounting plate. The tightening shaft is rotatably connected to the tightening shaft bearing seat. One end of the tightening shaft is connected to the driving end of the tightening drive component. The other end of the tightening shaft passes through the inner side of the outer positioning bushing and is connected to one end of the centering connecting shaft. The other end of the centering connecting shaft extends outward with a centering retaining edge. The return spring A is provided between the centering retaining edge and the inner side of the outer positioning bushing. The return spring A is sleeved on the outer side of one end of the centering connecting shaft and the other end of the tightening shaft. The thread detection component is connected to the other end of the centering connecting shaft. One end of the outer positioning bushing is sleeved on the tightening shaft, and the other end is connected to the centering pressure cap. The centering pressure cap has a centering retaining edge limiting hole that cooperates with the centering retaining edge. The inner wall of the centering retaining edge limiting hole abuts against the outer peripheral wall of the centering retaining edge.

[0009] The centering flange limiting hole is divided into a tapered channel section and a cylindrical channel section. The diameter of the tapered channel section of the centering flange limiting hole gradually increases from the side closer to the thread detection element to the side farther away from the thread detection element. The cylindrical channel section of the centering flange limiting hole connects with the opening of the tapered channel section on the side farther away from the thread detection element. The diameter of the cylindrical channel section of the centering flange limiting hole is the same as the opening and diameter of the tapered channel section on the side farther away from the thread detection element. The shape of the outer peripheral wall of the centering flange matches the shape of the inner wall of the centering flange limiting hole.

[0010] An elongated hole is provided on the other end of the tightening shaft along its length. One end of a universal joint is fitted onto the other end of the tightening shaft. A connecting pin that passes through the elongated hole is connected to one end of the universal joint. The other end of the universal joint is connected to one end of the centering connecting shaft. The return spring A is also fitted onto the outside of the universal joint.

[0011] The outer positioning sleeve on the outside of the tightening shaft is provided with a plurality of adjusting screws evenly distributed around its circumference. Each adjusting screw is connected to a centering spring between the end of the adjusting screw near the centering flange of the centering connecting shaft and the centering flange.

[0012] Each of the adjusting screws has a guide post A protruding at one end of the centering flange near the centering connecting shaft, and a guide post B protruding at the position corresponding to each guide post A on the centering flange. A corresponding set of guide posts A and guide posts B are respectively inserted into the same centering spring.

[0013] Each group of guide components includes a guide rod and a linear bearing. The linear bearings of each group of guide components are respectively mounted on the mounting base. One end of the guide rod of each group of guide components is connected to the mounting plate, and the other end passes through the linear bearing of the same group of guide components. A return spring B is respectively fitted on each guide rod between the mounting base and the mounting plate.

[0014] The detection assembly includes a magnetic ring mounting guide post, a sensor mounting cylinder, a sensor body, and a magnetic ring for use. One end of the sensor mounting cylinder is mounted on the mounting base, and the other end is connected to the sensor body. The detection end of the sensor body extends into the sensor mounting cylinder. The magnetic ring is sleeved on the detection end of the sensor body. One end of the magnetic ring mounting guide post is connected to the mounting plate, and the other end extends into the sensor mounting cylinder. The magnetic ring is connected to the other end of the magnetic ring mounting guide post.

[0015] A reset spring C is sleeved on the outer side of the detection end of the sensor body. One end of the reset spring C abuts against the other end of the magnetic ring mounting guide post, and the other end abuts against the inner side of the sensor mounting cylinder.

[0016] The mounting base is provided with a lead screw, and the slide is provided with a nut that is threadedly connected to the lead screw. The lead screw is driven to rotate by the drive end of the slide drive component.

[0017] The advantages and positive effects of this invention are as follows:

[0018] This invention, through its adaptive tightening head assembly design, effectively adapts to situations where there are different axes in the threaded hole, allowing the thread detection component to be smoothly screwed into the product's threaded end. Furthermore, by incorporating a detection component, it measures the depth to which the thread detection component is screwed into the product's threaded end face, and then uses torque and distance as parameters to determine whether the thread is qualified. This invention has the advantages of automatic centering and alignment, thus enabling better automatic detection of mating threads, resulting in higher detection efficiency and more accurate and stable detection results. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall three-dimensional structure of the present invention;

[0020] Figure 2 This is a bottom view of the overall structure of the present invention;

[0021] Figure 3 This is a schematic diagram of the arrangement structure of the tightening drive component, tightening head assembly, detection component, and guide component of the present invention;

[0022] Figure 4 This is one of the structural schematic diagrams of the tightening head assembly of the present invention;

[0023] Figure 5 This is a second schematic diagram of the tightening head assembly of the present invention;

[0024] Figure 6 This is a schematic diagram of the detection component of the present invention.

[0025] In the diagram: 1 is the mounting base, 2 is the slide, 3 is the mounting base, 4 is the mounting plate, and 5 is the slide drive component;

[0026] 601 is the tightening shaft bearing housing; 602 is the tightening shaft; 603 is the centering connecting shaft; 604 is the thread detection component; 605 is the return spring A; 606 is the outer positioning bushing; 607 is the centering gland; 608 is the universal joint; 609 is the connecting pin; 610 is the adjusting screw; 611 is the centering spring; 612 is the guide post A; 613 is the guide post B; 614 is the bearing; 615 is the inner limiting sleeve; 616 is the outer limiting sleeve; 617 is the bearing gland; 618 is the lock nut.

[0027] 701 is the guide rod, 702 is the linear bearing, 703 is the return spring B, and 704 is the limit ring;

[0028] 801 is the magnetic ring mounting guide post, 802 is the sensor mounting cylinder, 803 is the sensor body, 804 is the reset spring C, 805 is the guide post sleeve, and 806 is the baffle.

[0029] 901 is the lead screw, and 902 is the lead nut;

[0030] 10 is the tightening shaft connecting shaft, 11 is the tightening drive mounting base, and 12 is the tightening drive component. Detailed Implementation

[0031] The following is in conjunction with the appendix Figure 1-6 The present invention will be described in further detail below.

[0032] An automatic thread detection device, such as Figure 1-6 As shown, this embodiment includes a mounting base 1, a slide 2, a mounting base 3, a mounting plate 4, a tightening drive component 12, a tightening head assembly, a detection assembly, and a guide assembly. The mounting base 3 is inverted L-shaped.

[0033] In this embodiment, the slide 2 is slidably connected to the mounting base 1 and driven by the slide drive component 5. The mounting base 3 is mounted on the slide 2. The mounting plate 4 and the mounting base 3 are connected by several sets of guide components. The detection component is connected to the mounting plate 4 and the mounting base 3 respectively. The tightening head assembly and the tightening drive component 12 are connected to the mounting plate 4 respectively. The tightening head assembly is driven by the drive end of the tightening drive component 12. In this embodiment, a guide rail slider structure is also provided between the slide 2 and the mounting base 1 to make the slide 2 slide stably. In this embodiment, the tightening drive component 12 is a conventional electric wrench, and its action is controlled by an external controller. The tightening drive component 12 is connected to the mounting plate 4 through the tightening drive component mounting seat 11. The drive end of the tightening drive component 12 is a square head.

[0034] Specifically, such as Figure 1 and Figure 2 As shown, in this embodiment, the mounting base 1 is provided with a lead screw 901, and the slide 2 is provided with a nut 902 that is threadedly connected to the lead screw 901. The lead screw 902 is driven to rotate by the drive end of the slide drive component 5. In this embodiment, the slide drive component 5 is a prior art motor reducer structure, and its operation is controlled by an external controller.

[0035] Specifically, such as Figure 3-5As shown, the tightening head assembly in this embodiment includes a tightening shaft bearing housing 601, a tightening shaft 602, a centering connecting shaft 603, a thread detection element 604, a return spring A 605, an outer positioning bushing 606, and a centering pressure cap 607. In this embodiment, the thread detection element 604 is a prior art thread go / no-go gauge, which can be replaced according to the product to be tested.

[0036] The tightening shaft bearing housing 601 is mounted on the mounting plate 4, and the tightening shaft 602 is rotatably connected to the tightening shaft bearing housing 601. In this embodiment, the tightening shaft bearing housing 601 has two bearings 614 inside for supporting the tightening shaft 602. The two bearings 614 are separated and limited by a limiting inner sleeve 615 and a limiting outer sleeve 616. The tightening shaft bearing housing 601 has a bearing cover 617 on its outer opening. The tightening shaft 602 is threaded with a locking nut 618 for pressing the bearing cover 617, thereby realizing the axial positioning of the various parts inside the tightening shaft bearing housing 601.

[0037] One end of the tightening shaft 602 is connected to the drive end of the tightening drive component 12 via the tightening shaft connecting shaft 10. The other end of the tightening shaft 602 passes through the inner side of the outer positioning sleeve 606 and is connected to one end of the centering connecting shaft 603. The other end of the centering connecting shaft 603 extends outward with a centering retaining edge. A return spring A605 is provided between the centering retaining edge and the inner side of the outer positioning sleeve 606. A 605 sleeve is fitted on the outer side of one end of the centering connecting shaft 603 and the other end of the tightening shaft 602. A return spring A605 provides elastic force to the centering connecting shaft 603 for reset. A threaded detection component 604 is connected to the other end of the centering connecting shaft 603 by screws. One end of the outer positioning sleeve 606 is fitted onto the tightening shaft 602, and the other end is connected to the centering pressure cover 607. The centering pressure cover 607 has a centering edge limiting hole that mates with the centering edge, and the inner wall of the centering edge limiting hole abuts against the outer peripheral wall of the centering edge. In this embodiment, the tightening shaft connecting shaft 10 has a square through hole in the middle, used to connect the driving end of the tightening drive component 12 to the input end of the tightening shaft 602.

[0038] Specifically, such as Figure 4As shown, in this embodiment, the centering flange limiting hole is divided into a tapered channel section and a cylindrical channel section. The diameter of the tapered channel section of the centering flange limiting hole gradually increases from the side closer to the thread detection element 604 to the side farther away from the thread detection element 604. The cylindrical channel section of the centering flange limiting hole connects with the opening of the tapered channel section on the side farther away from the thread detection element 604. The diameter of the cylindrical channel section of the centering flange limiting hole is the same as the opening and diameter of the tapered channel section on the side farther away from the thread detection element 604. The shape of the outer peripheral wall of the centering flange matches the shape of the inner wall of the centering flange limiting hole, that is, the centering flange is divided into a conical part and a cylindrical part. By setting the centering connecting shaft 603 with the centering flange and the centering pressure cap 607 with the centering flange limiting hole, the centering connecting shaft 603 can be stably and accurately centered under the reset action of the reset spring A 605.

[0039] Specifically, such as Figure 4 As shown, in this embodiment, an elongated hole is provided on the other end of the tightening shaft 602 along its length. One end of a universal joint 608 is fitted onto the other end of the tightening shaft 602. A connecting pin 609, which passes through the elongated hole, is connected to one end of the universal joint 608. The other end of the universal joint 608 is connected to one end of the centering shaft 603 via a pin. A return spring A 605 is also fitted onto the outside of the universal joint 608. In this embodiment, the universal joint 608 is a commercially available product. The coordinated arrangement of the universal joint 608, return spring A 605, tightening shaft 602, and centering shaft 603 further provides positioning and guidance for the tightening shaft 602.

[0040] Specifically, such as Figure 3-5 As shown, in this embodiment, three adjusting screws 610 are evenly arranged circumferentially on the outer positioning sleeve 606 outside the tightening shaft 602. A centering spring 611 is connected between the end of each adjusting screw 610 near the centering flange of the centering connecting shaft 603 and the centering flange. In this embodiment, the stiffness of the centering spring 611 is less than the stiffness of the return spring A 605. A guide post A 612 protrudes from the end of each adjusting screw 610 near the centering flange of the centering connecting shaft 603. A guide post B 613 protrudes from the centering flange at a position corresponding to each guide post A 612. A corresponding set of guide posts A 612 and guide posts B 613 are inserted into the same centering spring 611. The guide posts A 612 and B 613 guide the centering spring 611. Adjusting the adjusting screws 610 adjusts the pre-compression of the centering spring 611. The arrangement of multiple sets of adjusting screws 610 and centering springs 611 provides positioning guidance and self-adaptation for the thread detection element 604 set on the centering connecting shaft 603.

[0041] Specifically, such as Figure 3As shown, in this embodiment, two sets of guide components are provided on each of the left and right sides of the tightening shaft 602, for a total of four sets of guide components. Each set of guide components includes a guide rod 701 and a linear bearing 702. The linear bearings 702 of each set of guide components are respectively mounted on the mounting base 3. One end of each guide rod 701 of each set of guide components is connected to the mounting plate 4, and the other end passes through the linear bearing 702 of the same set of guide components. A return spring B 703 is fitted on each guide rod 701 between the mounting base 3 and the mounting plate 4. In this embodiment, the stiffness of the return spring B 703 is greater than that of the return spring A 605. In this embodiment, the other end of each guide rod 701 passes through the linear bearing 702 of the same set of guide components and is provided with a limiting ring 704 for limiting and preventing the guide rod 701 from disengaging from the linear bearing 702. The arrangement of multiple sets of guide components serves to guide and support the movement of the mounting plate 4, which is equipped with the tightening drive component 12 and the tightening head assembly.

[0042] Specifically, such as Figure 6 As shown, in this embodiment, the detection component includes a magnetic ring mounting guide post 801, a sensor mounting cylinder 802, a sensor body 803, and a magnetic ring. One end of the sensor mounting cylinder 802 is mounted on the mounting base 3, and the other end is connected to the sensor body 803. The detection end of the sensor body 803 extends into the sensor mounting cylinder 802, and the magnetic ring is sleeved on the detection end of the sensor body 803. One end of the magnetic ring mounting guide post 801 is connected to the mounting plate 4 via a baffle 806 and screws, and the other end extends into the sensor mounting cylinder 802. The magnetic ring is connected to the other end of the magnetic ring mounting guide post 801. The sensor mounting cylinder 802 is also connected to a guide post sleeve 805 that cooperates with the magnetic ring mounting guide post 801, allowing the magnetic ring mounting guide post 801 to move stably. The mounting plate 4 moves back and forth, thereby driving the magnetic ring to move on the detection end of the sensor body 803 through the magnetic ring mounting guide post 801. The sensor body 803 detects the displacement value of the magnetic ring. In this embodiment, the magnetic ring mounting guide post 801 has a hollow structure, and the detection end of the sensor body 803 extends to the inner side of the magnetic ring mounting guide post 801. A reset spring C804 is sleeved on the outer side of the detection end of the sensor body 803. One end of the reset spring C804 abuts against the other end of the magnetic ring mounting guide post 801, and the other end abuts against the inner side of the sensor mounting cylinder 802. In this embodiment, the reset spring C804 is provided to push the magnetic ring mounting guide post 801 connected to the magnetic ring to reset; the stiffness of the reset spring C804 is less than the stiffness of the reset spring B703. In this embodiment, the sensor body 803 and the magnetic ring used are commercially available magnetostrictive scale products, which are connected to an external controller.

[0043] Working principle:

[0044] The product employs a horizontal online inspection system. The product is held and positioned by pneumatic grippers. The slide drive 5 transmits torque sequentially through the lead screw 901 and lead nut 902, propelling the slide 2 and the mounting base 3 equipped with a tightening head assembly forward. When the thread detection component 604 abuts against the product thread and the detection component detects the set displacement, i.e., the set compression value of the return spring A 605, the slide drive 5 stops feeding. The connecting pin 609 slides relative to the tightening shaft 602, and the centering connecting shaft 603 disengages from the centering cover 607. The universal coupling 6084 is self-adaptive, allowing the thread detection component 604 to automatically align with the product thread during screwing in. This solves the problem of the product axis and tightening axis not being perfectly aligned during mass production, leading to excessive tightening torque and misjudgments. The tightening shaft 602 is driven by the tightening drive 12, causing the thread detection component 604 to screw into the product thread for inspection. After inspection, the equipment returns to its initial position, and the return spring A... 605 pushes the centering connecting shaft 603 into the centering pressure cover 607. The contact part between the two consists of a cylindrical part and a conical part. The cylindrical part is used for centering, and the conical part is used for axial positioning, so that the initial position axis of the thread detection part 604 always remains consistent.

Claims

1. An automatic thread detection device, characterized in that: Includes mounting base (1), slide (2), mounting base (3), mounting plate (4), tightening drive (12), tightening head assembly, detection assembly and guide assembly; The slide (2) is slidably connected to the mounting base (1) and driven by the slide drive (5). The mounting base (3) is mounted on the slide (2). The mounting plate (4) and the mounting base (3) are connected by several sets of guide components. The detection components are respectively connected to the mounting plate (4) and the mounting base (3). The tightening head assembly and the tightening drive (12) are respectively connected to the mounting plate (4). The tightening head assembly is driven by the drive end of the tightening drive (12). The tightening head assembly includes a tightening shaft bearing seat (601), a tightening shaft (602), a centering connecting shaft (603), a thread detection component (604), a return spring A (605), an outer positioning bushing (606), and a centering pressure cap (607). The tightening shaft bearing seat (601) is mounted on the mounting plate (4). The tightening shaft (602) is rotatably connected to the tightening shaft bearing seat (601). One end of the tightening shaft (602) is connected to the driving end of the tightening drive (12). The other end of the tightening shaft (602) passes through the inner side of the outer positioning bushing (606) and is connected to one end of the centering connecting shaft (603). The other end of the centering connecting shaft (603) extends outward with a centering retaining edge. The centering retaining edge and the inner side of the outer positioning bushing (606) are provided with a reset. Spring A (605) is sleeved on the outside of one end of the centering connecting shaft (603) and the other end of the tightening shaft (602). The thread detection piece (604) is connected to the other end of the centering connecting shaft (603). One end of the outer positioning bushing (606) is sleeved on the tightening shaft (602), and the other end is connected to the centering cover (607). The centering cover (607) is provided with a centering edge limiting hole that cooperates with the centering edge. The inner wall of the centering edge limiting hole abuts against the outer peripheral wall of the centering edge. The centering flange limiting hole is divided into a tapered channel section and a cylindrical channel section. The diameter of the tapered channel section of the centering flange limiting hole gradually increases from the side closer to the thread detection element (604) to the side farther away from the thread detection element (604). The cylindrical channel section of the centering flange limiting hole is connected to the opening of the tapered channel section on the side farther away from the thread detection element (604). The diameter of the cylindrical channel section of the centering flange limiting hole is the same as the opening and diameter of the tapered channel section on the side farther away from the thread detection element (604). The shape of the outer peripheral wall of the centering flange matches the shape of the inner wall of the centering flange limiting hole. The other end of the tightening shaft (602) has an elongated hole along its length. The other end of the tightening shaft (602) is fitted with one end of a universal joint (608). One end of the universal joint (608) is connected to a connecting pin (609) that passes through the elongated hole. The other end of the universal joint (608) is connected to one end of the centering connecting shaft (603). The return spring A (605) is also fitted on the outside of the universal joint (608). A plurality of adjusting screws (610) are evenly provided on the outer positioning sleeve (606) on the outside of the tightening shaft (602) along the circumferential direction. Each adjusting screw (610) is connected to a centering spring (611) at one end near the centering flange of the centering connecting shaft (603). Each of the adjusting screws (610) has a guide post A (612) protruding at one end of the centering flange near the centering connecting shaft (603), and a guide post B (613) protruding at the position corresponding to each of the guide posts A (612) on the centering flange. A corresponding set of guide posts A (612) and guide posts B (613) are respectively inserted into the same centering spring (611). The detection component is used to detect the depth to which the thread detection component (604) is screwed into the end face of the product thread, and then to determine whether the thread is qualified by the two parameters of torque and distance.

2. The automatic thread detection device according to claim 1, characterized in that: Each group of guide components includes a guide rod (701) and a linear bearing (702). The linear bearing (702) of each group of guide components is respectively disposed on the mounting base (3). One end of the guide rod (701) of each group of guide components is connected to the mounting plate (4), and the other end passes through the linear bearing (702) of the same group of guide components. Each guide rod (701) between the mounting base (3) and the mounting plate (4) is fitted with a return spring B (703).

3. The automatic thread detection device according to claim 1, characterized in that: The detection assembly includes a magnetic ring mounting guide post (801), a sensor mounting cylinder (802), a sensor body (803) for use, and a magnetic ring. One end of the sensor mounting cylinder (802) is mounted on the mounting base (3), and the other end is connected to the sensor body (803). The detection end of the sensor body (803) extends into the sensor mounting cylinder (802). The magnetic ring is sleeved on the detection end of the sensor body (803). One end of the magnetic ring mounting guide post (801) is connected to the mounting plate (4), and the other end extends into the sensor mounting cylinder (802). The magnetic ring is connected to the other end of the magnetic ring mounting guide post (801).

4. The automatic thread detection device according to claim 3, characterized in that: A reset spring C (804) is sleeved on the outer side of the detection end of the sensor body (803). One end of the reset spring C (804) abuts against the other end of the magnetic ring mounting guide post (801), and the other end abuts against the inner side of the sensor mounting cylinder (802).

5. The automatic thread detection device according to claim 1, characterized in that: The mounting base (1) is provided with a lead screw (901), and the slide (2) is provided with a nut (902) that is threadedly connected to the lead screw (901). The lead screw (901) is driven to rotate by the drive end of the slide drive (5).

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