A testing device for detecting the load on an electrofusion welding machine.

Abstract

This utility model relates to the technical field of electrofusion welding machine testing, and discloses a testing device for load testing of electrofusion welding machines. It includes a first mounting plate and a second mounting plate, which divide the internal space of the test chamber into an upper resistor placement layer and a lower resistor placement layer. This layered placement of upper and lower resistors makes full use of the test chamber space, allowing the upper and lower resistors to be distributed at different heights, thus providing more resistor ranges for load testing of the electrofusion welding machine within the same floor area. Furthermore, the bottom ventilation holes at the bottom of the test chamber and the side ventilation holes on the sides of the test chamber form the main heat dissipation channel. Cold air enters the test chamber through the bottom ventilation holes, absorbs heat, and is then discharged through the side ventilation holes, forming a continuous cooling airflow circulation.

Description

Technical Field

[0001] This utility model relates to the technical field of testing electrofusion welding machines, and specifically to a testing device for testing the load of an electrofusion welding machine. Background Technology

[0002] With the widespread application of high-density polyethylene (HDPE) pipes in urban gas transmission and distribution, water supply and drainage systems, and other pressure pipeline projects, the welding quality of pipe connection joints affects the long-term safe operation of the entire pipeline system. During pipeline construction, electrofusion welding is the primary method for connecting adjacent HDPE pipes, and its welding quality directly impacts the sealing performance, pressure-bearing capacity, and service life of the HDPE pipes.

[0003] Currently, performance testing of electrofusion welding machines primarily utilizes resistance testing boxes as load testing devices. These boxes simulate a load by measuring the resistance within the box, allowing for the measurement of key parameters such as current and voltage output by the welding machine. However, existing resistance testing boxes suffer from several drawbacks: firstly, they offer a limited number of resistance value ranges, resulting in a narrow testing range that cannot assess the welding machine's performance under varying resistance conditions; secondly, resistance testing boxes designed for multi-range resistance value testing are often bulky, making them inconvenient to move and carry, and particularly unsuitable for on-site testing. These limitations severely impact the efficiency and convenience of testing work, thus necessitating the development of a resistance testing box that combines multi-range test loads with a miniaturized design. Utility Model Content

[0004] The present invention aims to provide a testing device for load testing of an electrofusion welding machine, which can meet multiple load testing levels while ensuring the portability of the testing device.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: 1) A testing device for load detection of an electrofusion welding machine, comprising a test box, the test box having a positive detection port and a negative detection port, the positive detection port and the negative detection port being electrically connected to the positive output terminal and the negative output terminal of the electrofusion welding machine, respectively; the inner side wall of the test box having a first mounting plate and a second mounting plate arranged opposite to each other, the first mounting plate and the second mounting plate together dividing the internal space of the test box into an upper resistor placement layer and a lower resistor placement layer, the upper resistor placement layer having a plurality of upper resistors evenly distributed therein, the lower resistor placement layer having a plurality of lower resistors evenly distributed therein, all the upper and lower resistors being connected in parallel and then connected in series with the positive detection terminal and the negative detection terminal.

[0006] In this invention, the interior space of the test chamber is divided into an upper resistor placement layer and a lower resistor placement layer by a first and a second mounting plate arranged horizontally opposite each other. The upper resistor placement layer is used to place upper-layer resistors, and the lower resistor placement layer is used to place lower-layer resistors. This layered placement of upper and lower resistors makes full use of the space in the test chamber, allowing the upper and lower resistors to be distributed at different heights. Therefore, with the same bottom area of ​​the test chamber, more resistor ranges can be provided for load testing of the electrofusion welding machine.

[0007] In contrast, traditional single-layer layouts can only lay resistors flat at the bottom of the test chamber, limiting the number of resistors that can be placed per unit area. Increasing the number of resistors requires enlarging the test chamber's dimensions, resulting in a larger footprint. The layered design of this invention, however, significantly increases the number of resistors that can be accommodated by stacking them vertically without increasing the test chamber's length or width, making the overall structure more compact. This design optimizes space utilization and avoids the problem of excessively large equipment size caused by increasing the number of resistors.

[0008] 2) A testing device for detecting the load of an electrofusion welding machine according to 1), wherein: The bottom of the test chamber has several ventilation units along its length. The position of the lower layer resistor corresponds to the position of the upper layer resistor, and the position of the ventilation unit corresponds to the position of the lower layer resistor. The ventilation unit includes several bottom ventilation holes opened at the bottom of the test chamber, and several side ventilation holes are opened on the side of the test chamber.

[0009] In this invention, the upper and lower resistors are arranged in a one-to-one vertical configuration. This arrangement allows the heat generated by the upper and lower resistors during operation to be naturally dissipated from both sides of the resistors, preventing heat from accumulating around them and failing to dissipate in time.

[0010] The bottom ventilation holes at the bottom of the test chamber and the side ventilation holes on the sides form the main heat dissipation channel. Cool air from the environment enters the test chamber through the bottom ventilation holes. The airflow first flows through the lower resistor placement layer, absorbing the heat generated by the lower resistors during operation. Then, it rises through the upper resistor placement layer, absorbing the heat generated by the upper resistors during operation. Finally, the hot air is exhausted from the test chamber through the side ventilation holes, forming a continuous cooling airflow circulation. This maintains a balanced temperature inside the chamber and prevents overheating of the upper and lower resistors, which could lead to unstable resistance values. Furthermore, the ventilation units are positioned one-to-one with the lower resistors, ensuring that each lower and upper resistor receives uniform cooling airflow, thereby ensuring stable resistance values ​​for each upper and lower resistor.

[0011] 3) A testing device for detecting the load of an electrofusion welding machine according to 1), wherein: A conductive positive detection horizontal bar is connected inside the positive detection port. A conductive positive detection vertical bar is rotatably connected to the end of the positive detection horizontal bar. The end of the positive detection vertical bar is provided with a positive plug for inserting a power supply welding machine. A conductive negative detection horizontal bar is connected inside the negative detection port. A conductive negative detection vertical bar is rotatably connected to the end of the negative detection horizontal bar. The end of the negative detection vertical bar is provided with a negative plug for inserting a power supply welding machine.

[0012] In this invention, a positive detection crossbar connects the positive detection port to the positive detection vertical bar, and the positive detection crossbar and positive detection vertical bar are rotatably connected. The positive detection vertical bar has a positive terminal socket at its end. Similarly, a negative detection crossbar connects the negative detection port to the negative detection vertical bar, and the negative detection crossbar and negative detection vertical bar are rotatably connected. The negative detection vertical bar also has a negative terminal socket at its end. This rotatable connection design allows the positive and negative detection vertical bars to be freely adjusted in angle, facilitating connection of the electrofusion welding machine at different positions and significantly improving operational convenience. Furthermore, all four detection bars—positive, negative, positive, and negative—are made of conductive materials, ensuring stable transmission of the detection current between the positive and negative terminals, guaranteeing the reliability and measurement accuracy of the load test.

[0013] 4) A testing device for detecting the load of an electrofusion welding machine according to 3), wherein: The positive electrode detection crossbar, positive electrode detection vertical bar, negative electrode detection crossbar, and negative electrode detection vertical bar are all made of copper.

[0014] In this invention, the positive electrode detection crossbar, positive electrode detection vertical bar, negative electrode detection crossbar, and negative electrode detection vertical bar are made of copper. These materials possess excellent electrical and thermal conductivity, ensuring stable current transmission with extremely low loss. Simultaneously, they possess sufficient mechanical strength to withstand frequent angle adjustments, and their good oxidation resistance guarantees reliable contact during long-term use. This material selection optimizes current conduction performance while also considering structural durability and economic practicality, providing a stable and reliable electrical connection foundation for load testing.

[0015] 5) A testing device for detecting the load of an electrofusion welding machine according to 1), wherein: The test chamber is equipped with a horizontally arranged partition plate, which divides the internal space of the test chamber into a resistor placement area for accommodating upper and lower resistors and a non-resistor placement area. Several partition ventilation holes are evenly distributed on the partition plate, and several convection ventilation holes are opened on the side wall of the non-resistor placement chamber.

[0016] In this invention, a partition plate divides the internal space of the test chamber into a resistor placement area and a non-resistor placement area, thereby achieving functional zoning within the test chamber. The resistor placement area is used to accommodate upper and lower level resistors, while the non-resistor placement area is used to accommodate other components within the test chamber, thus preventing heat radiation from the upper and lower level resistors from affecting other components during operation.

[0017] Furthermore, the hot air generated by the operation of the upper and lower resistors rises naturally through the partition ventilation holes, enters the upper non-resistor area, and is then exhausted outside the test chamber through the side convection ventilation holes. This design creates an effective airflow path, which, in conjunction with the main heat dissipation channel of the resistor area, ensures that the temperature in all areas of the test chamber remains uniform and stable, avoiding localized overheating.

[0018] Compared with the prior art, this utility model also has the following technical effects: This invention divides the internal space of the test chamber into an upper resistor placement layer and a lower resistor placement layer using a first mounting plate and a second mounting plate. Compared with existing technologies, this layered placement of upper and lower resistors makes full use of the test chamber space, allowing the upper and lower resistors to be distributed at different heights. This provides more resistor ratings for load testing of electrofusion welding machines within the same floor area. Secondly, the bottom ventilation holes at the bottom of the test chamber and the side ventilation holes on the sides form the main heat dissipation channel. Cool air enters the test chamber through the bottom ventilation holes, absorbs heat, and is then discharged through the side ventilation holes, creating a continuous airflow circulation for heat dissipation. Furthermore, air rises naturally through the partition ventilation holes and is then discharged outside the test chamber through the side convection ventilation holes. This, in conjunction with the main heat dissipation channel, ensures that the temperature in all areas of the test chamber remains uniform and stable, preventing localized overheating. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of a test device for detecting the load of an electrofusion welding machine according to the present invention.

[0020] Figure 2 This is a schematic diagram of the partition plate in a test device for detecting the load of an electrofusion welding machine according to the present invention.

[0021] Figure 3 This is a schematic diagram of the positive and negative detection rods in a testing device for detecting the load of an electrofusion welding machine according to the present invention.

[0022] Figure 4 This is a schematic diagram showing the connection between the positive electrode detection horizontal bar and the positive electrode detection vertical bar of a test device for detecting the load of an electrofusion welding machine according to this utility model. Detailed Implementation

[0023] The following detailed description illustrates the specific implementation method: The reference numerals in the accompanying drawings include: test box 1, first mounting plate 2, second mounting plate 3, bottom ventilation hole 4, side ventilation hole 5, positive electrode detection horizontal bar 6, positive electrode detection vertical bar 7, negative electrode detection vertical bar 8, partition plate 9, partition ventilation hole 10, convection ventilation hole 11, positive electrode rotating shaft 12, negative electrode rotating shaft 13, first strip hole 14, second strip hole 15, first mounting hole 16, and second mounting hole 17.

[0024] See the example. Figure 1 As shown, this embodiment of a testing device for load detection of an electrofusion welding machine includes a test box 1. The test box 1 has a positive detection port and a negative detection port, which are electrically connected to the positive and negative output terminals of the electrofusion welding machine, respectively. A first mounting plate 2 and a second mounting plate 3 are horizontally arranged welded to the inner side wall of the test box 1. The first mounting plate 2 and the second mounting plate 3 are arranged opposite to each other. The first mounting plate 2 and the second mounting plate 3 together divide the internal space of the test box 1 into an upper resistor placement layer and a lower resistor placement layer. A number of upper resistors are evenly distributed in the upper resistor placement layer along the length direction of the test box 1, and a number of lower resistors are evenly distributed in the lower resistor placement layer along the length direction of the test box 1. All upper and lower resistors are connected in parallel and then connected in series with the positive and negative detection terminals.

[0025] In this embodiment, inside the test chamber 1, the internal space of the test chamber 1 is divided into an upper resistor placement layer and a lower resistor placement layer by a first mounting plate 2 and a second mounting plate 3 arranged horizontally opposite to each other. The upper resistor placement layer is the space above the upper side of the first mounting plate and the second mounting plate, and the lower resistor placement layer is the space below the lower side of the first mounting plate and the second mounting plate.

[0026] The upper resistor placement layer is used to place upper resistors with resistance values ​​of 0.4Ω, 0.6Ω, 1.0Ω, and 1.6Ω, while the lower resistor placement layer is used to place lower resistors with resistance values ​​of 2.0Ω, 10Ω, 15Ω, and 200Ω. This layered placement of upper and lower resistors makes full use of the space in the test chamber 1, allowing the upper and lower resistors to be distributed at different heights, thus providing more resistor ranges for load testing of the electrofusion welding machine within the same floor area. Furthermore, the first mounting plate 2 has several first mounting holes 16 evenly distributed along its length for mounting the upper resistors, and the second mounting plate 3 has several second mounting holes 17 evenly distributed along its length for mounting the upper resistors.

[0027] In contrast, traditional single-layer layouts can only lay resistors flat at the bottom of test chamber 1, limiting the number of resistors that can be placed per unit area. If the number of resistors needs to be increased, the only solution is to enlarge the size of test chamber 1, which results in a larger footprint. The layered design in this embodiment, however, can significantly increase the number of resistors that can be accommodated by stacking them vertically without increasing the length or width of test chamber 1, making the overall structure more compact. This design optimizes space utilization and avoids the problem of excessively large equipment size caused by increasing the number of resistors.

[0028] This invention employs a detection circuit formed by connecting all upper and lower layer resistors in parallel and then connecting them in series with the positive and negative detection terminals. The positive terminals of the four upper and four lower layer resistors are all connected to the positive detection terminal via CK3-40 AC contactors. Each AC contactor is electrically connected to an operation button, which is used to turn the AC contactor on or off. The operation buttons are mounted on the side of the test box.

[0029] The negative terminals of the four upper-layer resistors and the four lower-layer resistors are all connected to a DC detector for detecting DC current and voltage and an AC detector for detecting AC current and voltage. Both the DC detector and the AC detector use OHR-ES10 voltage sensors, thereby realizing the separate detection of DC and AC parameters.

[0030] The test chamber has a DC display screen and an AC display screen mounted on its side. All three devices—the DC detector, the AC detector, and the display screen—are electrically connected to the microprocessor. The DC detector continuously monitors current and voltage signals and sends them to the microprocessor, which processes the signals and displays the values ​​on the DC display screen. Similarly, the AC detector monitors current and voltage signals and sends them to the microprocessor, which also processes the signals and displays the values ​​on the AC display screen. Furthermore, both the DC and AC display screens are electrically connected to display operation buttons, which are used to turn the display screen on or off.

[0031] The specific operating procedure is as follows: First, insert the positive output terminal of the electrofusion welding machine into the positive detection port, and the negative output terminal into the negative detection port. Then, press the operation button corresponding to the required load resistance, and press the corresponding display operation button according to the type of electrofusion welding machine. Turn on the power to the electrofusion welding machine; the positive output terminal will begin outputting current. The key parameters such as current and voltage output by the electrofusion welding machine can be determined by observing the values ​​on the DC or AC display screen.

[0032] Secondly, four ventilation units are located along the length of the bottom of the test chamber 1. The positions of the lower-layer resistors correspond one-to-one with the positions of the upper-layer resistors, and the positions of the ventilation units correspond one-to-one with the positions of the lower-layer resistors. Each ventilation unit includes several bottom ventilation holes 4 at the bottom of the test chamber 1 and several side ventilation holes 5 on the sides of the test chamber 1. In this embodiment, the bottom ventilation holes 4 at the bottom of the test chamber 1 and the side ventilation holes 5 on the sides of the test chamber 1 form the main heat dissipation channel. Cold air from the environment enters the interior of the test chamber 1 through the bottom ventilation holes 4. The airflow first flows through the lower resistor placement layer, absorbing the heat generated by the lower resistors during operation. Then, it flows upward through the upper resistor placement layer, absorbing the heat generated by the upper resistors during operation. Finally, the hot air is discharged from the test chamber 1 through the side ventilation holes 5, forming a continuous heat dissipation airflow circulation, thereby maintaining a balanced temperature inside the chamber and preventing the upper and lower resistors from overheating and causing unstable resistance values. In addition, the one-to-one correspondence between the positions of the ventilation units and the lower resistors ensures that each lower and upper resistor receives uniform heat dissipation airflow, thereby ensuring stable resistance values ​​for each upper and lower resistor.

[0033] See Figure 3 and Figure 4 As shown, a conductive positive detection horizontal bar 6 is connected inside the positive detection port. A conductive positive detection vertical bar 7 is rotatably connected to the end of the positive detection horizontal bar. A positive plug for inserting a power supply welding machine is installed at the end of the positive detection vertical bar 7. A conductive negative detection horizontal bar is connected inside the negative detection port. A conductive negative detection vertical bar 8 is rotatably connected to the end of the negative detection horizontal bar. A negative plug for inserting a power supply welding machine is installed at the end of the negative detection vertical bar 8.

[0034] In this embodiment, the upper and lower resistors are arranged in a one-to-one vertical configuration. This arrangement allows the heat generated by the upper and lower resistors during operation to be naturally dissipated from both sides of the resistors, preventing heat from accumulating around them and failing to dissipate in time.

[0035] The positive detection crossbar 6 connects the positive detection port to the positive detection vertical bar 7. A positive rotating shaft 12 is welded to the end of the positive detection crossbar 6, and the positive rotating shaft 12 is rotatably connected to the end of the positive detection vertical bar 7. A positive plug is installed at the end of the positive detection vertical bar 7. The negative detection crossbar connects the negative detection port to the negative detection vertical bar 8. A negative rotating shaft is welded to the end of the negative detection crossbar, and the negative rotating shaft is rotatably connected to the end of the negative detection vertical bar 8. A negative plug is installed at the end of the negative detection vertical bar 8. This rotatable connection design allows the positive detection vertical bar 7 and the negative detection vertical bar 8 to be freely adjustable in angle, facilitating connection of the electrofusion welding machine in different positions and significantly improving operational convenience. Furthermore, the positive detection crossbar 6, negative detection crossbar, positive detection vertical bar 7, and negative detection vertical bar 8 are all made of conductive material to ensure stable transmission of the detection current between the positive and negative plugs, guaranteeing the reliability and measurement accuracy of the load test.

[0036] Secondly, the positive detection crossbar 6, positive detection vertical bar 7, positive detection shaft 12, negative detection crossbar, negative detection vertical bar 8, and negative detection shaft 13 are all made of copper. In this embodiment, the copper-made positive detection crossbar 6, positive detection vertical bar 7, negative detection crossbar, negative detection vertical bar 8, positive detection shaft 12, and negative detection shaft 13 possess excellent electrical and thermal conductivity, ensuring stable transmission of the detection current with extremely low loss. Simultaneously, they possess sufficient mechanical strength to withstand frequent angle adjustment operations, and their good oxidation resistance ensures contact reliability during long-term use. This material selection optimizes current conduction performance while also considering structural durability and economic practicality, providing a stable and reliable electrical connection foundation for load testing.

[0037] See Figure 2 As shown, a horizontally arranged partition plate 9 is welded inside the test chamber 1. The partition plate 9 divides the internal space of the test chamber 1 into a resistor placement area and a non-resistor placement area for accommodating the upper and lower resistors. Several partition ventilation holes 10 are evenly distributed on the partition plate 9, and several convection ventilation holes 11 are opened on the side wall of the non-resistor placement chamber.

[0038] In this embodiment, the partition plate 9 divides the internal space of the test box 1 into a resistor placement area and a non-resistor placement area, thereby realizing functional zoning within the test box 1. The resistor placement area is used to accommodate the upper and lower resistors, while the non-resistor placement area is used to accommodate all AC contactors, DC detectors, and AC detectors, thus preventing the heat dissipation of the upper and lower resistors from affecting other components.

[0039] Secondly, the hot air generated by the operation of the upper and lower resistors will naturally rise through the partition ventilation holes 10, enter the upper non-resistor area, and then be discharged outside the test chamber 1 through the side convection ventilation holes 11. This design forms an effective airflow path, which works in conjunction with the main heat dissipation channel of the resistor area to ensure that the temperature of each area inside the test chamber 1 remains uniform and stable, avoiding local overheating.

[0040] In addition, the partition plate 9 has a first mounting unit corresponding to the first mounting plate 2. The first mounting unit includes two first strip holes 14, which facilitate the connection between the upper resistor and other components in the non-resistor placement area. The partition plate 9 has a second mounting unit corresponding to the second mounting plate 3. The second mounting unit includes two second strip holes 15, which facilitate the connection between the lower resistor and other components in the non-resistor placement area.

[0041] In this embodiment, the internal space of the test chamber 1 is divided into an upper resistor placement layer and a lower resistor placement layer using the first mounting plate 2 and the second mounting plate 3. Compared with the prior art, this layered placement of upper and lower resistors in this embodiment makes full use of the space of the test chamber 1, allowing the upper and lower resistors to be distributed at different heights. This provides more resistor ranges for load testing of the electrofusion welding machine within the same floor area. Secondly, the bottom ventilation hole 4 at the bottom of the test chamber 1 and the side ventilation hole 5 on the side of the test chamber 1 form the main heat dissipation channel. Cold air enters the interior of the test chamber 1 through the bottom ventilation hole 4, absorbs heat, and is then discharged from the test chamber 1 through the side ventilation hole 5, forming a continuous heat dissipation airflow circulation. In addition, air will rise naturally through the partition ventilation hole 10 and then be discharged from the test chamber 1 through the side convection ventilation hole 11. This works in conjunction with the main heat dissipation channel to ensure that the temperature of each area inside the test chamber 1 remains uniform and stable, avoiding local overheating.

[0042] The above are merely embodiments of this utility model. Commonly known technical solutions and / or characteristics are not described in detail here. It should be noted that those skilled in the art can make various modifications and improvements without departing from the technical solution of this utility model. These modifications and improvements should also be considered within the scope of protection of this utility model, and will not affect the effectiveness of the implementation of this utility model or the practicality of the patent. The scope of protection claimed in this application shall be determined by the content of its claims, and the specific embodiments described in the specification can be used to interpret the content of the claims.

Claims

1. A testing device for load detection of an electrofusion welding machine, comprising a test chamber, wherein the test chamber is provided with a positive detection port and a negative detection port, the positive detection port and the negative detection port being electrically connected to the positive output terminal and the negative output terminal of the electrofusion welding machine, respectively, characterized in that, The inner sidewall of the test chamber is provided with a first mounting plate and a second mounting plate arranged opposite to each other. The first mounting plate and the second mounting plate together divide the internal space of the test chamber into an upper resistor placement layer and a lower resistor placement layer. A number of upper resistors are evenly distributed in the upper resistor placement layer, and a number of lower resistors are evenly distributed in the lower resistor placement layer. All the upper and lower resistors are connected in parallel and then connected in series with the positive and negative detection terminals.

2. A testing device for load detection of an electric welding machine according to claim 1, characterized in that: The test chamber has several ventilation units along its length at the bottom. The position of the lower layer resistor corresponds one-to-one with the position of the upper layer resistor. The position of the ventilation unit corresponds one-to-one with the position of the lower layer resistor. The ventilation unit includes several bottom ventilation holes at the bottom of the test chamber and several side ventilation holes on the side of the test chamber.

3. A testing device for load sensing of an electric fusion welder as defined in claim 1, characterized in that: A conductive positive detection horizontal bar is connected inside the positive detection port. A conductive positive detection vertical bar is rotatably connected to the end of the positive detection horizontal bar. The end of the positive detection vertical bar is provided with a positive plug for inserting a power supply welding machine. A conductive negative detection horizontal bar is connected inside the negative detection port. A conductive negative detection vertical bar is rotatably connected to the end of the negative detection horizontal bar. The end of the negative detection vertical bar is provided with a negative plug for inserting a power supply welding machine.

4. A testing device for load sensing of an electric fusion welder according to claim 3, characterized in that: The positive electrode detection crossbar, positive electrode detection vertical bar, negative electrode detection crossbar, and negative electrode detection vertical bar are all made of copper.

5. A testing device for load sensing of an electric fusion welder as defined in claim 1, wherein: The test chamber is equipped with a horizontally arranged partition plate, which divides the internal space of the test chamber into a resistor placement area and a non-resistor placement area for accommodating upper and lower resistors. The partition plate is evenly distributed with a number of partition ventilation holes, and the side wall of the non-resistor placement area is provided with a number of convection ventilation holes.

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