Piston rod eddy current flaw detection device adopting roller feeding

Abstract

The utility model relates to a piston rod eddy current flaw detection device adopting roller feeding, which comprises an eddy current flaw detector, and roller feeding devices are arranged on the feeding side and the discharging side of the eddy current flaw detector; the roller feeding device comprises a conveying wheel located on the lower side, a top frame is arranged above the conveying wheel, and a plurality of large wheel sets and a plurality of small wheel sets are alternately installed on the top frame. Each of the large wheel set and the small wheel set comprises a connecting rod, a roller and a tension spring; the upper end of the connecting rod is hinged to the top frame, the lower end of the connecting rod is rotationally connected with a roller, and a tension spring is connected between one side of the connecting rod and the top frame. The diameter of the piston rod to be detected is not limited, and the device is suitable for piston rods of various specifications and models. In the feeding and discharging process, the large wheel set or the small wheel set is selected according to the diameter of the piston rod, the large wheel set or the small wheel set can press the piston rod in a self-adaptive mode under the action of the tension spring, and therefore a liftable pressing device does not need to be arranged, the structure is simplified, and cost is reduced.

Description

Technical Field

[0001] This utility model relates to the field of piston rod processing inspection technology, and in particular to an eddy current flaw detection device for piston rods with roller feeding. Background Technology

[0002] After piston rods undergo grinding and polishing processes, eddy current flaw detectors are typically used to inspect their surface to ensure a high yield rate. This method is convenient and accurate. However, existing eddy current flaw detectors have a drawback: their loading and unloading mechanisms cannot be adaptively adjusted according to the piston rod diameter. For example, Chinese patent CN110038816B, entitled "Eddy Current Flaw Detector for Piston Rods," shows that its loading structure limits the piston rod's specifications, only supporting shorter and thinner piston rods, and is unsuitable for piston rods longer than 50 cm. Similarly, Chinese patent CN116879387A, entitled "Eddy Current Flaw Detection Device for Piston Rods," shows that its loading and unloading mechanisms use support rollers and a clamping device to press the piston rod together. To accommodate piston rods of different diameters, the support rollers and clamping device require a height adjustment structure to adjust the piston rod's height to align with the center of the annular flaw detector. The addition of a clamping device results in a complex and bulky overall structure, increasing costs. Therefore, there is currently a lack of eddy current flaw detection devices in the field that are simple in structure and can adapt to the loading and unloading of piston rods of various specifications. Utility Model Content

[0003] The purpose of this application is to provide an eddy current flaw detection device for a piston rod with roller feeding, which aims to solve the problems existing in the prior art.

[0004] This application provides a piston rod eddy current flaw detection device with roller feeding, including an eddy current flaw detector, wherein roller feeding devices are provided on both the feed side and the discharge side of the eddy current flaw detector.

[0005] The roller feeding device includes a conveyor wheel located on the lower side, and a top frame is provided above the conveyor wheel. Multiple large wheel sets and multiple small wheel sets are alternately installed on the top frame. Each of the large wheel sets and small wheel sets includes a connecting rod, a roller, and a tension spring. The upper end of the connecting rod is hinged to the top frame, and the lower end of the connecting rod is rotatably connected to a roller. A tension spring is connected between one side of the connecting rod and the top frame. The wheel diameter and wheel spacing of the rollers in the large wheel sets are larger than those of the rollers in the small wheel sets, and the length of the connecting rod in the large wheel sets is shorter than that of the connecting rod in the small wheel sets.

[0006] Furthermore, there are two parallel top frames; each end of the roller in the large or small wheel set is connected to a connecting rod, and the two connecting rods are respectively hinged to the two top frames.

[0007] Furthermore, the two connecting rods in the large wheel assembly are connected to the outer sides of the two top frames, while the two connecting rods in the small wheel assembly are connected to the inner sides of the two top frames.

[0008] Furthermore, the conveyor wheels are rotatably mounted on the base frame, and there are multiple conveyor wheels, each connected to a power unit.

[0009] Furthermore, multiple large wheel sets are connected to the same starting device, and multiple small wheel sets are connected to the same starting device.

[0010] Furthermore, the starting device is an operating linkage mounted on multiple sets of linkages, with a handle provided at one end of the operating linkage.

[0011] Furthermore, the eddy current flaw detector is mounted on a conveyor platform, on which a rotating roller parallel to the length direction of the piston rod is rotatably mounted.

[0012] The beneficial effects of this utility model are as follows: This utility model provides an eddy current flaw detection device that uses a large wheel set and a small wheel set for loading and unloading. It has no limitation on the diameter of the piston rod to be inspected and is suitable for various specifications and models of piston rods. During the loading and unloading process, the large or small wheel set is selected according to the diameter of the piston rod. The large or small wheel set can adaptively press the piston rod under the action of a tension spring, thus eliminating the need for a liftable pressing device, simplifying the structure, and reducing costs. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0014] Figure 2 This is a schematic diagram of the top frame part of this utility model.

[0015] Figure 3 This is a schematic diagram of the starting device.

[0016] In the picture:

[0017] 1. Eddy current flaw detector; 2. Conveying platform; 3. Rotary roller; 4. Piston rod; 5. Conveying wheel; 6. Base frame; 7. Top frame; 8. Large wheel assembly; 9. Small wheel assembly; 10. Large wheel connecting rod; 11. Large diameter wheel; 12. Large wheel tension spring; 13. Small wheel connecting rod; 14. Small diameter wheel; 15. Small wheel tension spring; 16. Operating connecting rod; 17. Handle. Detailed Implementation

[0018] 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.

[0019] like Figure 1 The illustrated eddy current flaw detection device for a piston rod with roller feeding includes an eddy current flaw detector 1, which is mounted on a conveying platform 2. A rotating roller 3, parallel to the length direction of the piston rod 4, is rotatably mounted on the conveying platform 2. The circumferential surface of the rotating roller 3 is tangent to the circumferential surface of the piston rod 4. The rotating roller 3 is connected to a power output device such as a motor, which drives the rotating roller 3 to rotate, thereby causing the piston rod 4, which is in contact with and tangential to its circumferential surface, to rotate. In this embodiment, the number of rotating rollers 3 is preferably two, with the piston rod 4 falling between the two rotating rollers 3.

[0020] The eddy current flaw detector 1 is equipped with roller feeding devices on both the feed side and the discharge side, which are used for feeding and unloading the piston rod 4, respectively.

[0021] like Figure 2 As shown, the roller feeding device includes a conveyor wheel 5 located on the lower side. The conveyor wheel 5 is rotatably mounted on the base frame 6. There are multiple conveyor wheels 5, and a power output device is connected to the conveyor wheel 5. The wheel surface of the conveyor wheel 5 is preferably concave, and the piston rod 4 is conveyed by the rotation of the conveyor wheel 5.

[0022] A top frame 7 is mounted above the conveyor wheel 5, on which multiple large wheel sets 8 and multiple small wheel sets 9 are alternately mounted. The large wheel set 8 includes a large wheel connecting rod 10, a large-diameter wheel 11, and a large wheel tension spring 12. The small wheel set 9 includes a small wheel connecting rod 13, a small-diameter wheel 14, and a small wheel tension spring 15. The upper ends of both the large wheel connecting rod 10 and the small wheel connecting rod 13 are hinged to the top frame 7. The lower end of the large wheel connecting rod 10 is rotatably connected to the large-diameter wheel 11, and the lower end of the small wheel connecting rod 13 is rotatably connected to the small-diameter wheel 14, allowing the connecting rod to rotate around the hinge point. A large wheel tension spring 12 connects one side of the large wheel connecting rod 10 to the top frame 7, and similarly, a small wheel tension spring 15 connects the small wheel connecting rod 13 to the top frame 7. The wheel diameter and wheel spacing of the large-diameter wheel 11 are greater than those of the small-diameter wheel 14, and the length of the large wheel connecting rod 10 is less than the length of the small wheel connecting rod 13.

[0023] There are two parallel top frames 7. Each end of the large-diameter wheel 11 is connected to a large-wheel connecting rod 10, and each end of the small-diameter wheel 14 is connected to a small-wheel connecting rod 13. The two large-wheel connecting rods 10 and the two small-wheel connecting rods 13 are hinged to the two top frames 7 respectively. Specifically, the two large-wheel connecting rods 10 are connected to the outer sides of the two top frames 7, and the two small-wheel connecting rods 13 are connected to the inner sides of the two top frames 7.

[0024] Multiple large wheel sets 8 are connected to the same starting device and are started by a single starting device. Multiple small wheel sets 9 are also connected to the same starting device and are started by a single starting device. In this embodiment, the starting device is an operating link 16 that is mounted on multiple sets of connecting rods. The multiple sets of connecting rods are hinged to the operating link 16, as shown below. Figure 3 As shown, a handle 17 is provided at one end of the operating linkage 16. By operating the handle 17, multiple sets of linkages can be rotated together around their hinge points simultaneously.

[0025] In use, the large wheel set 8 corresponds to the larger diameter piston rod 4, and the small wheel set 9 corresponds to the smaller diameter piston rod 4. Figure 1 As shown, with the left side of the eddy current flaw detector 1 as the feed side, when inspecting the large-diameter piston rod 4, the handle 17 is used to operate the connecting rod 16 to rotate the large wheel connecting rod 10 counterclockwise past the lowest point. At this time, the large wheel tension spring 12 is in a stretched state, so that it does not obstruct the piston rod 4 from being placed on the conveyor wheel 5. Then, the handle 17 is released, and the large wheel tension spring 12 contracts, driving the large wheel connecting rod 10 to rotate clockwise until the large-diameter wheel 11 abuts against the piston rod 4. At this time, the large wheel tension spring 12 is still in a stretched state, and the tension of the large wheel tension spring 12 can be converted into the pressure of the large-diameter wheel 11 on the piston rod 4, pressing the piston rod 4 tightly. Then, the conveyor wheel 5 rotates, conveying the piston rod 4 to the eddy current flaw detector 1.

[0026] The rotation of the roller 3 at the eddy current flaw detector 1 drives the piston rod 4 to rotate, thereby enabling the eddy current flaw detector 1 to detect the circumference of the piston rod 4. To avoid omissions when a single probe detects the rotating and advancing piston rod 4, this can be solved by adding multiple probes or by using the cooperation of the conveyor wheel 5 and the roller 3 to make the piston rod 4 rotate one revolution under a single probe before continuing its advance.

[0027] During this process, the small wheel tension spring 15 tightens the small wheel connecting rod 13, causing the small wheel assembly 9 to press firmly against the top frame 7 and not to contact the piston rod 4. When testing the small-diameter piston rod 4, the handle 17 and operating connecting rod 16 of the small wheel assembly 9 can be operated as described above, and the large wheel assembly 8 presses firmly against the top frame 7 under the tension of the large wheel tension spring 12.

[0028] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects.

Claims

1. An eddy current flaw detection device for a piston rod with roller feeding, characterized in that, Including an eddy current flaw detector, which is equipped with roller feeding devices on both the feed side and the discharge side; The roller feeding device includes a conveyor wheel located on the lower side, and a top frame is provided above the conveyor wheel. Multiple large wheel sets and multiple small wheel sets are alternately installed on the top frame. Each of the large wheel sets and small wheel sets includes a connecting rod, a roller, and a tension spring. The upper end of the connecting rod is hinged to the top frame, and the lower end of the connecting rod is rotatably connected to a roller. A tension spring is connected between one side of the connecting rod and the top frame. The wheel diameter and wheel spacing of the rollers in the large wheel sets are larger than those of the rollers in the small wheel sets, and the length of the connecting rod in the large wheel sets is shorter than that of the connecting rod in the small wheel sets.

2. The eddy current flaw detection device for the piston rod of the roller feeder according to claim 1, characterized in that, The top frame consists of two parallel components; each end of the roller in the large or small wheel set is connected to a connecting rod, and the two connecting rods are respectively hinged to the two top frames.

3. The eddy current flaw detection device for the piston rod of the roller feeder according to claim 2, characterized in that, The two connecting rods in the large wheel assembly are connected to the outside of the two top frames, and the two connecting rods in the small wheel assembly are connected to the inside of the two top frames.

4. The eddy current flaw detection device for the piston rod of the roller feeder according to claim 1, characterized in that, The conveyor wheels are rotatably mounted on the base frame. There are multiple conveyor wheels, and a power unit is connected to each conveyor wheel.

5. The eddy current flaw detection device for the piston rod of the roller feeder according to claim 1, characterized in that, Multiple large wheel sets are connected to the same starting device, and multiple small wheel sets are connected to the same starting device.

6. The eddy current flaw detection device for the piston rod of the roller feeder according to claim 5, characterized in that, The starting device is an operating linkage installed on multiple sets of linkages, and one end of the operating linkage is provided with a handle.

7. The eddy current flaw detection device for the piston rod of the roller feeder according to claim 1, characterized in that, The eddy current flaw detector is mounted on a conveyor platform, on which a rotating roller parallel to the length direction of the piston rod is rotatably mounted.

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