An automatic resistance detection device for electric fusion pipe fittings

Abstract

The present invention provides an automatic resistance detection device for electric fusion pipe fittings, which belongs to the technical field of electric fusion pipe fitting production equipment. It solves the technical problems of existing electric fusion pipe fitting resistance detection devices, namely low detection efficiency and high cost. The automatic resistance detection device for electric fusion pipe fittings includes a bracket and two electrode rods for cooperating with the terminal posts of the electric fusion pipe fittings. The two electrode rods can translate along their own axes. The bracket is provided with a turntable for supporting the electric fusion pipe fittings. The bracket is also connected to a retaining edge portion arranged around the center of the turntable and capable of coaxially positioning the electric fusion pipe fittings and the turntable. The retaining edge portion is connected to a limiting column. When the turntable rotates and drives the electric fusion pipe fittings to rotate, the terminal posts of the electric fusion pipe fittings can abut against the limiting column for limitation and be coaxially aligned with the electrode rods. The present invention has higher detection efficiency.

Description

Technical Field

[0001] The invention belongs to the technical field of electric fusion pipe fitting production equipment and relates to an automatic resistance detection device for electric fusion pipe fittings. Background Art

[0002] PE electrofusion fittings are the primary components of electrofusion butt joints. Their inner walls are embedded with spirally distributed resistance wires. When energized, these wires heat and melt the polyethylene material, fusing the connecting pipes together. Because PE electrofusion fittings can experience problems such as short circuits between rings, wire breakage, and uneven resistance during production, resistance testing is required for each finished fitting to ensure quality control. However, due to the diverse shapes, sizes, and specifications of these fittings, resistance testing is currently performed manually, often by connecting the electrode rods of resistance testing equipment to the terminal posts on the outer circumference of the PE electrofusion fittings.

[0003] A Chinese patent with authorization announcement number CN206960556U discloses a mobile positioning device for automatic detection of PE pipe fitting resistance with machine vision. A camera, an X-axis double-screw mechanism, and a Y-axis single-screw mechanism are arranged at a fixed position on the device mounting frame. Each screw of the X-axis double-screw mechanism is configured with a measuring probe assembly. The measuring probe assembly includes a Z-axis driver for driving the measuring probe to move in the Z-axis direction. The motor drives the Y-axis screw mechanism to shift the X-axis double-screw mechanism to a coordinate alignment position of the two terminal posts of the PE electric fusion pipe fitting; the motor drives the two measuring probe assemblies on the X-axis double-screw mechanism to move to the coordinate alignment position of the two terminal posts of the PE electric fusion pipe fitting, and the Z-axis driver drives the measuring probe to move to contact the terminal posts of the PE electric fusion pipe fitting.

[0004] The above equipment can realize the resistance detection of electric fusion pipe fittings, but this solution simulates manual operation, so that the robot moves the electrode rod to the accurate position to detect the electric fusion pipe fittings. The long alignment cycle of the robot makes the detection efficiency low and the cost high. Summary of the Invention

[0005] In view of the above problems existing in the prior art, the present invention provides an automatic resistance detection device for electrofusion pipe fittings. The technical problem to be solved by the present invention is: how to improve the efficiency of resistance detection of electrofusion pipe fittings.

[0006] The purpose of the present invention can be achieved through the following technical solutions:

[0007] A device for automatically detecting the resistance of an electric fusion pipe fitting comprises a bracket and two electrode rods for cooperating with the terminal posts of the electric fusion pipe fitting, wherein the two electrode rods can translate along their own axis, and is characterized in that the bracket is provided with a turntable for supporting the electric fusion pipe fitting, and the bracket is also connected to a stop edge portion arranged around the center of the turntable and capable of positioning the electric fusion pipe fitting coaxially with the turntable, and the stop edge portion is connected to a limiting column, and when the turntable rotates and drives the electric fusion pipe fitting to rotate, the terminal posts of the electric fusion pipe fitting can abut against the limiting column for limitation and be coaxially opposite to the electrode rods.

[0008] The bracket is used to support the electrofusion pipe fitting. The outer ends of the two electrode rods can be energized and connected to the two terminal posts of the electrofusion pipe fitting to measure the resistance value. The electrode rods can translate along their own axis to ensure accurate movement trajectory. By providing a turntable for placing the electrofusion pipe fitting and a retaining edge for positioning the electrofusion pipe fitting on the bracket, and providing limit posts on the retaining edge, the electrofusion pipe fitting can be constrained by the retaining edge when placed on the turntable, allowing it to be quickly positioned vertically to the center of the turntable. The turntable is then controlled to rotate, driving the electrofusion pipe fitting so that the protruding terminal posts on the outer periphery can abut against the limit posts on the retaining edge and be positioned at a specified angle. At this time, the turntable is only allowed to continue to move slightly or stop to ensure that the terminal posts are positioned and aligned with the electrode rods. The electrode rods are then controlled to translate to achieve precise insertion and testing. After the test is completed, the electrode rods retract, and the turntable rotates in the opposite direction to return the protruding terminal posts on the outer periphery of the electrofusion pipe fitting to the direction before measurement. The electrofusion pipe fitting is removed by a robot, eliminating the need for manual flipping and adjustment of the position of the electrofusion pipe fitting for testing, thereby improving testing efficiency.

[0009] In the aforementioned automatic resistance detection device for electrofusion pipe fittings, the retaining edge comprises three horizontally arranged straight bars around the circumference of the turntable. When the electrofusion pipe fitting is coaxially arranged with the turntable, all three straight bars are tangent to or approximately tangent to the outer circumference of the pipe fitting. The limiting post is connected to the lower surface of any of the straight bars. This arrangement of three straight bars for limiting the position of the electrofusion pipe fitting helps reduce the contact area between the pipe fitting and the retaining edge, reducing frictional resistance, simplifying the structure, and facilitating cost control.

[0010] In the aforementioned automatic resistance detection device for electrofusion pipe fittings, one of the straight rods can be perpendicular to the horizontally arranged electrode rod. This straight rod and the straight rod connected to the limit post can be spaced apart on either side of the turntable. This straight rod, perpendicular to the electrode rod, can provide positive support from behind the electrofusion pipe fitting when the electrode rod is inserted into the terminal post, preventing the fitting from slipping due to unbalanced loading, which could affect the success rate of docking during testing.

[0011] In the aforementioned automatic resistance detection device for electrofusion pipe fittings, the straight bar perpendicular to the electrode rod can be arranged parallel to the straight bar connected to the limit post, with a horizontal clearance opening defined between the two parallel bars. This ensures that the spacing between the two bars consistently matches the radial dimensions of the electrofusion pipe fitting, increasing the range of restraint for the fitting. The clearance opening can be positioned closer to the operator, facilitating placement of the fitting through the clearance opening while minimizing the likelihood of interference between the terminal and the straight bar.

[0012] In the above-mentioned automatic resistance detection device for electrofusion pipe fittings, the non-parallel straight bars and the parallel straight bars are arranged in an up-down staggered manner, so that the straight bars do not interfere with each other and facilitate spatial arrangement when the straight bars need to cross.

[0013] In the aforementioned automatic resistance detection device for electrofusion pipe fittings, when the turntable drives the electrofusion pipe fitting to rotate, the outer ends of the pipe fitting's terminals are sequentially directed toward the clearance opening, the straight bar perpendicular to the electrode rod, and the straight bar connected to the limit post. By controlling the direction of the turntable's rotation, when the terminal of the electrofusion pipe fitting contacts the limit post, the reaction force applied to the entire fitting is directed toward the side with the non-parallel straight bar. This reduces the risk of excessive deflection of the fitting toward the clearance opening caused by collision between the terminal and the limit post due to excessive rotation, thereby improving detection stability.

[0014] In the aforementioned automatic resistance detection device for electrofusion pipe fittings, each end of the straight bar has a waist-shaped hole extending vertically through it and arranged perpendicularly to the straight bar. The straight bar is connected to the bracket via bolts passing through the waist-shaped holes. This allows the vertical position of the straight bar to be adjusted for electrofusion pipe fittings of varying diameters, thereby ensuring that the three straight bars can be positioned and matched to the outer periphery of different electrofusion pipe fittings, improving applicability.

[0015] In the aforementioned automatic resistance detection device for electrofusion pipe fittings, the bracket is connected to a vertically arranged guide rail, and both electrode rods are connected to the guide rail and can be adjusted up and down along the guide rail. This allows the position of the electrode rods to be adjusted to accommodate the varying spacing between the terminal posts of different electrofusion pipe fittings, thereby improving applicability.

[0016] In the aforementioned automatic resistance detection device for electrofusion pipe fittings, a drive cylinder is connected between the bracket and the guide rail, capable of driving the guide rail for horizontal translation. When the drive cylinder retracts the electrode rod, the turntable drives the electrofusion pipe fitting in the opposite direction, returning the terminal to its pre-measurement orientation. This ensures automatic, coordinated movement of the two electrode rods, ensuring efficient detection. When the drive cylinder retracts the electrode rod, the turntable reverses, returning the terminal to its pre-measurement orientation. This eliminates the need for the operator to manually rotate the electrofusion pipe fitting, allowing for smooth removal and improved operational convenience.

[0017] In the aforementioned automatic resistance detection device for electrofusion pipe fittings, the electrode rod comprises a rod body with its outer end facing the side of the rotary disk and a connecting plate connected to the guide rail. The rod body is connected to the connecting plate and can move axially relative to the connecting plate. A compression spring member is sheathed around the outer periphery of the rod body, resting between the outer end of the rod body and the connecting plate. This compression spring member adjusts the relative position of the rod body and the connecting plate, preventing damage caused by excessive rod rigidity when the rod body misaligns with the terminal, thereby ensuring detection safety.

[0018] Compared with the prior art, the advantages of the present invention are as follows:

[0019] The resistance automatic detection device of the electric fusion pipe fitting is provided with a turntable for placing the electric fusion pipe fitting and a retaining edge portion for positioning the electric fusion pipe fitting on the bracket, and a limit column is provided on the retaining edge portion. In this way, the electric fusion pipe fitting can be constrained by the retaining edge portion when placed on the turntable so that it can be quickly positioned vertically to the center of the turntable. The turntable is controlled to rotate automatically to ensure that the terminal posts protruding from the outer periphery of the electric fusion pipe fitting can abut against the limit columns on the retaining edge portion and be positioned at a specified angle. At this time, the turntable is only allowed to continue to move a small amount or stop to ensure that the position of the terminal posts is determined and aligned with the axial direction of the electrode rod. The electrode rod is then controlled to move horizontally to accurately connect and detect. After the detection is completed, the electrode rod is retracted to remove the electric fusion pipe fitting. There is no need to manually flip and adjust the position of the electric fusion pipe fitting for detection, thereby improving detection efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 Schematic diagram of the structure of the electric fusion pipe in this embodiment.

[0021] Figure 2 It is a schematic diagram of the three-dimensional structure of this embodiment.

[0022] Figure 3 yes Figure 2 Enlarged view of part A in .

[0023] Figure 4 It is a schematic diagram of the three-dimensional structure of this embodiment when working.

[0024] In the figure, 1, bracket;

[0025] 2. Electrode rod; 21. Rod body; 22. Connecting plate; 23. Compression spring;

[0026] 3. Turntable;

[0027] 4. Edge retaining portion; 41. Limiting column; 42. Straight bar; 421. Waist-shaped hole; 43. Opening;

[0028] 5. Guide rail; 6. Driving cylinder;

[0029] 7. Electric fusion pipe fittings; 71. Terminals. DETAILED DESCRIPTION

[0030] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solutions of the present invention, but the present invention is not limited to these embodiments.

[0031] like Figure 1-4As shown, the present automatic resistance detection device for an electrofusion pipe fitting comprises a bracket 1 and two electrode rods 2 for engaging with the terminal posts 71 of the electrofusion pipe fitting 7. The two electrode rods 2 are capable of axial translation. The bracket 1 is provided with a turntable 3 for supporting the electrofusion pipe fitting 7. The turntable 3 is driven by a motor mounted on the bracket 1. The bracket 1 is also connected to a retaining edge 4 arranged around the center of the turntable 3 and capable of coaxially positioning the electrofusion pipe fitting 7 and the turntable 3. The retaining edge 4 is connected to a limiting post 41. When the turntable 3 rotates, driving the electrofusion pipe fitting 7, the terminal posts 71 of the electrofusion pipe fitting 7 abut against the limiting post 41 and become coaxially aligned with the electrode rods 2. The bracket 1 supports the electrofusion pipe fitting 7. The outer ends of the two electrode rods 2 can be energized and connected to the copper terminals of the two terminal posts 71 of the electrofusion pipe fitting 7 to measure the resistance. The electrode rods 2 are capable of axial translation to ensure accurate motion. By arranging a turntable 3 for placing the electric fusion pipe fitting 7 and a retaining edge 4 for positioning the electric fusion pipe fitting 7 on the bracket 1, and arranging a limit column 41 on the retaining edge 4, the electric fusion pipe fitting 7 can be constrained by the retaining edge 4 when placed on the turntable 3 so that it can be quickly positioned vertically to the center of the turntable 3. Controlling the turntable 3 to rotate automatically can ensure that the terminal 71 protruding from the outer periphery of the electric fusion pipe fitting 7 can abut against the limit column 41 on the retaining edge 4 and be positioned at a specified angle. At this time, the turntable 3 only continues to move a small amount or stops to ensure that the position of the terminal 71 is determined and axially aligned with the electrode rod 2. Then, the electrode rod 2 is controlled to move horizontally to accurately plug in and detect. After the detection is completed, the electrode rod 2 retracts and the electric fusion pipe fitting 7 is removed. There is no need to manually flip and adjust the position of the electric fusion pipe fitting 7 for detection, thereby improving detection efficiency. Specifically, the retaining edge 4 comprises three horizontal bars 42 arranged horizontally around the circumference of the turntable 3. When the electrofusion pipe 7 is arranged coaxially with the turntable 3, the three bars 42 are tangential or nearly tangential to the outer circumference of the pipe 7. The limiting post 41 is connected to the lower surface of the middle portion of the bar 42. The provision of three bars 42 to limit the position of the pipe 7 helps reduce the contact area between the pipe 7 and the retaining edge 4, reducing frictional resistance, simplifying the structure, and facilitating cost control. Furthermore, the bars 42 are perpendicular to the horizontally arranged electrode rod 2. These bars 42 and the bars 42 connected to the limiting post 41 can be spaced apart on either side of the turntable 3. Thus, the bars 42, perpendicular to the electrode rod 2, provide positive support to the pipe 7 from behind when the electrode rod 2 is inserted into the terminal 71, preventing the pipe 7 from slipping due to unbalanced loading, which could affect the docking success rate during testing. The straight bar 42 perpendicular to the electrode rod 2 and the straight bar 42 connected to the limiting pillar 41 are arranged in parallel, and a gap 43 is provided between the two parallel straight bars 42 along the horizontal direction.In this way, the distance between the two straight bars 42 is always adapted to the radial size of the electric fusion pipe fitting 7, increasing the range of constraints on the electric fusion pipe fitting 7. The clearance opening 43 can be arranged on the side close to the operator, which is convenient for the operator to place the electric fusion pipe fitting 7 from the clearance opening 43 and reduces the probability of interference and collision between the terminal 71 and the straight bars 42. The non-parallel straight bars 42 and the parallel straight bars 42 are arranged in a vertically staggered manner. In this way, the straight bars 42 will not interfere with each other, which facilitates the spatial arrangement of the straight bars 42 when they need to cross. When the turntable 3 drives the electric fusion pipe fitting 7 to rotate, the terminal 71 of the electric fusion pipe fitting 7 can be sequentially oriented to the clearance opening 43, the straight bar 42 perpendicular to the electrode rod 2, and the straight bar 42 connected to the limiting column 41. By controlling the rotation direction of the turntable 3 in this way, when the terminal 71 of the electric fusion pipe fitting 7 contacts the limit post 41, the reaction force on the entire electric fusion pipe fitting 7 will be directed toward the side where the non-parallel straight bar 42 is located, thereby reducing the phenomenon that the terminal 71 with excessive rotation speed collides with the limit post 41 and causes the electric fusion pipe fitting 7 to excessively deflect toward the side of the yield opening 43, thereby improving the detection stability. Preferably, both ends of the straight bar 42 have a waist-shaped hole 421 that is vertically through and arranged perpendicular to the straight bar 42. The straight bar 42 is connected to the bracket 1 by a bolt that passes through the waist-shaped hole 421. In this way, for electric fusion pipe fittings 7 of different pipe diameters, the position of the straight bar 42 along the vertical direction of the length can be adjusted, thereby ensuring that the three straight bars 42 can be positioned and matched with the outer periphery of different electric fusion pipe fittings 7, thereby improving applicability.

[0032] like Figure 2-4 As shown, the bracket 1 is connected to a vertically arranged guide rail 5, and the two electrode rods 2 are both connected to the guide rail 5 and can be adjusted up and down along the guide rail 5. In this way, the position of the electrode rod 2 can be adjusted and adapted according to the different spacings between the two terminals 71 of different electric fusion pipe fittings 7, thereby improving applicability. A driving cylinder 6 is connected between the bracket 1 and the guide rail 5, which can drive the guide rail 5 to move horizontally. In this way, the two electrode rods 2 can automatically and uniformly move, ensuring detection efficiency. The electrode rod 2 includes a rod body 21 with an outer end facing the side where the turntable 3 is located and a connecting plate 22 connected to the guide rail 5. The rod body 21 can be plugged into the terminal 71. The rod body 21 is connected to the connecting plate 22 and can move axially relative to the connecting plate 22. The outer periphery of the rod body 21 is provided with a compression spring member 23 that is arranged between the outer end of the rod body 21 and the connecting plate 22. In this way, the compression spring 23 can adjust the relative position of the rod body 21 and the connecting plate 22, avoiding damage caused by excessive rigidity of the rod body 21 when there is a deviation in the matching between the rod body 21 and the terminal 71, thereby ensuring detection safety.

[0033] The specific embodiments described herein are merely illustrative of the spirit of the present invention. Persons skilled in the art may make various modifications, additions, or substitutions to the described specific embodiments without departing from the spirit of the present invention or exceeding the scope of the appended claims.

Claims

1. An automatic resistance detection device for an electrofusion pipe fitting, comprising a bracket (1) and two electrode rods (2) for cooperating with the terminal (71) of the electrofusion pipe fitting (7), wherein the two electrode rods (2) can translate along their own axial direction, and is characterized in that: The bracket (1) is provided with a turntable (3) for supporting the electric fusion pipe (7), and the bracket (1) is also connected to a retaining edge portion (4) arranged around the center of the turntable (3) and capable of coaxially positioning the electric fusion pipe (7) and the turntable (3). The retaining edge portion (4) is connected to a limiting column (41). When the turntable (3) rotates to drive the electric fusion pipe (7) to rotate, the terminal (71) of the electric fusion pipe (7) can abut against the limiting column (41) and be coaxially aligned with the electrode rod (2); the retaining edge portion (4) includes three straight horizontally arranged around the circumference of the turntable (3). The bars (42) are arranged coaxially with the electric fusion pipe (7) and the turntable (3), and the three straight bars (42) can be tangent or approximately tangent to the outer peripheral surface of the electric fusion pipe (7). The limiting column (41) is connected to the lower surface of any straight bar (42). One straight bar (42) is perpendicular to the horizontally arranged electrode rod (2). The straight bar (42) is spaced from the straight bar (42) connected to the limiting column (41) and is arranged parallel to both sides of the turntable (3). There is a gap (43) between the two parallel straight bars (42) in the horizontal direction.

2. The automatic resistance detection device for electric fusion pipe fittings according to claim 1, characterized in that: The non-parallel straight bars (42) and the parallel straight bars (42) are arranged in an up-down staggered manner.

3. The automatic resistance detection device for electric fusion pipe fittings according to claim 1, characterized in that: When the rotary disk (3) drives the electric fusion pipe (7) to rotate, the outer end of the terminal (71) of the electric fusion pipe (7) can be sequentially directed toward the clearance opening (43), the straight bar (42) perpendicular to the electrode insertion rod (2), and the straight bar (42) connected to the limiting column (41).

4. The automatic resistance detection device for electric fusion pipe fittings according to claim 1, 2 or 3, characterized in that: Both ends of the straight bar (42) have waist-shaped holes (421) that penetrate vertically and are arranged perpendicular to the straight bar (42). The straight bar (42) is connected to the bracket (1) via bolts that penetrate the waist-shaped holes (421).

5. The automatic resistance detection device for electric fusion pipe fittings according to claim 1, 2 or 3, characterized in that: A vertically arranged guide rail (5) is connected to the bracket (1), and both electrode rods (2) are connected to the guide rail (5) and can be adjusted up and down along the guide rail (5).

6. The automatic resistance detection device for electric fusion pipe fittings according to claim 5, characterized in that: A driving cylinder (6) capable of driving the guide rail (5) to move horizontally is connected between the bracket (1) and the guide rail (5); when the driving cylinder (6) drives the electrode rod (2) to retract and reset, the turntable (3) can drive the electric fusion pipe (7) to rotate in the opposite direction and return the terminal (71) to the orientation before measurement.

7. The automatic resistance detection device for electric fusion pipe fittings according to claim 5, characterized in that: The electrode plug rod (2) comprises a rod body (21) with its outer end facing the side where the rotating disk (3) is located, and a connecting plate (22) connected to the guide rail (5). The rod body (21) is connected to the connecting plate (22) and can move axially relative to the connecting plate (22). The outer periphery of the rod body (21) is provided with a compression spring member (23) that is arranged between the outer end of the rod body (21) and the connecting plate (22).

Images