A test tool for a tube heater and a test device thereof

Abstract

The utility model discloses a kind of test tool for tubular heater, including tool body, the tool body includes clamping assembly and two conductive wires, clamping assembly includes two mutually close folding or mutually away clamping blocks, the upper side of two clamping blocks is respectively provided with containing recess, the cooperation side of two clamping blocks is respectively provided with the clamping recess that is communicated with containing recess, two conductive wires are sequentially set in corresponding containing recess and clamping recess, and the part of two conductive wires respectively corresponding to clamping recess is bare part;When two clamping blocks are in folding state, two clamping recesses form the clamping part of the test site for clamping tubular heater test site.In testing process, tester need not directly contact tubular heater or conductive wire bare part, but is through operating clamping assembly to complete clamping and testing, effectively avoid the risk of mis-touch, significantly improve the safety of test operation.The utility model further provides a kind of test device for tubular heater.

Description

Technical Field

[0001] This utility model relates to the field of heater testing technology, and more specifically to a testing fixture and testing device for tubular heaters. Background Technology

[0002] A tubular heater is a tubular electric heating element that converts electrical energy into heat energy. Tubular heaters can be classified by material into metal heaters, glass heaters, ceramic heaters, carbon fiber heaters, and silicone heaters, etc. In order to ensure the quality of heaters, electrical performance tests are usually performed on the heaters after production. These tests are usually conducted by switching the power on and off and / or simulating extreme environments to test the heater's lifespan, high temperature durability, electrical performance limits, etc.

[0003] However, in the existing technology, when testing the electrical performance of heaters, the positive and negative terminals of the tester are usually directly connected to the positive and negative terminals of the heater through wires, and then the instrument is started to carry out the test. However, in actual operation, the tester is prone to accidentally touching the heating element, which poses a certain safety hazard.

[0004] In view of this, this application has conducted in-depth research on this basis, resulting in this case. Utility Model Content

[0005] The purpose of this invention is to provide a safe testing fixture for tubular heaters.

[0006] Another objective of this invention is to provide a safe and highly efficient testing device.

[0007] To achieve the above objectives, the solution of this utility model is: A testing fixture for a tubular heater includes a fixture body, which includes a clamping assembly and two conductive wires. The clamping assembly includes two clamping blocks that are close to or far apart from each other, with the side facing each other being the mating side and the side facing away from each other being the separating side. Each of the two clamping blocks has a receiving groove on its upper surface, and a clamping recess communicating with the receiving groove on the mating side of each clamping block. The two conductive wires are sequentially disposed in the corresponding receiving groove and the clamping recess, with the portions of each conductive wire corresponding to the clamping recess being exposed. When the two clamping blocks are closed together, the two clamping recesses together form a clamping portion for clamping the testing part of the tubular heater.

[0008] The two clamping blocks correspond to a positioning block and a sliding block that can approach or move away from the positioning block, respectively. A fixing component is provided on the opposite side of the sliding block, and a return spring is tensioned between the opposite side and the fixing component. When the return spring is in its natural state, the sliding block and the positioning block are in a closed state, so that the two clamping recesses together form the clamping part.

[0009] It also includes a clamping guide rail, which is located below the clamping assembly and away from the clamping recess, and the positioning block is mounted on the clamping guide rail, and the sliding block is slidably mounted on the clamping guide rail.

[0010] Each clamping block is equipped with a positioning component on each side corresponding to the clamping recess. Both positioning components include an insulating gasket and a positioning threaded hole and a positioning screw that cooperate with each other. Each clamping block has two positioning threaded holes on its opposite side. The two positioning threaded holes are respectively connected to the receiving groove. The free ends of the two positioning screws are respectively positioned at the clamping recess by the insulating gasket.

[0011] It also includes an automatic opening and closing component located at one end of the clamping assembly near the clamping recess. The automatic opening and closing component includes an opening and closing handle and an opening and closing part. The mating sides of the two clamping blocks are respectively provided with opening and closing grooves. When the two clamping blocks are in the closed state, the two opening and closing grooves together form an elliptical opening and closing part. The opening and closing handle is adapted to the opening and closing part.

[0012] There are at least two return springs, and each of the return springs is arranged at intervals along the length direction of the sliding block.

[0013] Each of the clamping blocks has a cover plate installed on its upper side to conceal the receiving groove.

[0014] It also includes a substrate, and there are at least two tooling bodies. The clamping guide rail is mounted on the substrate. Each of the tooling bodies is arranged at intervals on the clamping guide rail, wherein the fixing component outside each tooling body is the positioning block in the tooling body adjacent to the opposite side of its sliding block, and the fixing component outside the tooling body that does not have an adjacent tooling body outside the opposite side of each tooling body is a fixing block.

[0015] It includes a chassis, a controller, and a test fixture, wherein the test fixture is disposed inside the chassis and the controller is disposed outside the chassis.

[0016] A wiring guide rail is mounted on the substrate along its length. The wiring guide rail and the clamping guide rail are arranged side by side, and at least two wiring groups are slidably mounted on the wiring guide rail. Each wiring group includes two terminals. The two conductive wires on each test fixture are respectively connected to the two terminals on a wiring group. The two terminals in each wiring group on the wiring guide rail are respectively connected to the positive and negative terminals of the power supply of the controller.

[0017] With the above structure, the testing fixture for tubular heaters of this invention has the following beneficial effects: By using the cooperation of two clamping blocks and the setting of conductive wires, stable clamping and conductive connection of the test part of the tubular heater are achieved. During the test, the tester does not need to directly contact the energized tubular heater or the exposed part of the conductive wire, but completes the clamping and testing by operating the clamping assembly, effectively avoiding the risk of accidental contact and significantly improving the safety of the test operation; in addition, the design of the clamping recess can be adapted to tubular heaters of different specifications, enhancing the versatility of this invention.

[0018] Furthermore, when multiple tubular heaters need to be tested, multiple tooling bodies arranged sequentially at intervals can be set up, and positioning blocks in adjacent tooling bodies can be used as fixing components to form a continuous test unit. That is, this utility model can realize the testing of multiple tubular heaters at one time, thereby improving the testing efficiency.

[0019] Furthermore, the cover plate in this invention can protect the conductive wires inside the recess, preventing dust and impurities from entering and affecting the conductivity.

[0020] Furthermore, the automatic opening and closing component in this invention facilitates the quick placement or removal of the tubular heater from the clamping part, simplifying the operation process.

[0021] Furthermore, the positioning component in this invention can stably fix the exposed part of the conductive wire in the clamping recess, ensuring that the conductive wire and the test part can form good conductive contact when clamping the tubular heater, avoiding the impact of poor contact on the accuracy of the test results, and also preventing the conductive wire from shifting or falling off during long-term use, thereby improving the structural stability and service life of the test fixture.

[0022] With the above structure, the testing device for tubular heaters of this utility model has the following beneficial effects: the testing fixture is integrated into the chassis, and the controller realizes unified power supply and testing control for multiple tubular heaters. The tester only needs to place the tubular heaters into the clamping parts of each testing fixture in sequence and start the controller to complete the batch test, which greatly reduces the time cost of a single operation and improves the testing efficiency.

[0023] Furthermore, the chassis design can isolate the testing area, and together with the anti-accidental contact design of the testing fixture itself, it forms a double safety protection, which not only ensures the personal safety of the testing personnel, but also significantly improves the overall testing efficiency through multi-station parallel testing, making it suitable for quality inspection in large-scale production. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of a conventional tubular ceramic heater.

[0025] Figure 2 This is a schematic diagram of the test fixture in Example 1.

[0026] Figure 3 This is a schematic diagram of the cooperation between the positioning component and the conductive wire in the test fixture of Example 1.

[0027] Figure 4 This is a schematic diagram of the test fixture in Example 2.

[0028] Figure 5 This is a schematic diagram of the opening and closing handle in the test fixture of Example 2 when it just starts to rotate.

[0029] Figure 6 This is a schematic diagram of the test device in Example 3.

[0030] In the picture: 1a - Tubular heater; 11a - Conductive contact surface; 100 - Tooling body; 200 - Base plate; 300 - Chassis; 1-Clamping assembly; 11-Positioning block; 111-Receiving groove; 112-Clamping recess; 12-Sliding block; 2-Conductive wire; 21-Exposed part; 3-Return spring; 31-Fixing component; 4-Clamping guide rail; 41-Mounting base; 411-Mounting slot; 5-Cover plate; 61-Opening and closing handle; 611-Hand grip; 612-Matching end; 62-Opening and closing groove; 63-Opening and closing part; 71-Locking screw; 72-Insulating washer; 8- Wiring guide rail. Detailed Implementation

[0031] To further explain the technical solution of this utility model, the following detailed description is provided through specific embodiments.

[0032] Example 1 A testing fixture for tubular heaters is provided, suitable for positioning the tubular heater to facilitate subsequent testing, such as conventional electrical performance testing. The tubular heater can be a metal heater, glass heater, ceramic heater, or carbon fiber heater. This embodiment uses a tubular ceramic heater as an example. Figure 1 As shown, a conventional tubular heater 1a has two conductive contact surfaces 11a at its first end. The two conductive contact surfaces 11a are in contact with the conductive wires described below to enable the tubular heater to conduct electricity. The two conductive contact surfaces 11a together form the test area of ​​the tubular heater.

[0033] For ease of description, the orientation during normal testing of this utility model is used as the reference direction for this utility model.

[0034] like Figure 1-3 As shown, the testing fixture of this utility model includes a fixture body 100, which includes a clamping assembly 1 and two conductive wires 2. The clamping assembly 1 includes two clamping blocks that are either closed or separated by distance. The two clamping blocks are arranged side by side, and preferably both clamping blocks are cuboid structures. For ease of description, the side facing each other of the two clamping blocks is the mating side, and the side separated by distance is the separating side. The upper side of each of the two clamping blocks is provided with a receiving groove 111, which extends along the length of the clamping block. The receiving groove is used to place the conductive wires 2. The mating side of each of the two clamping blocks is provided with a clamping recess 112 that communicates with the receiving groove 111. The shape of the clamping recess 112 is adapted to the testing part of the tubular heater and can be arc-shaped or V-shaped, preferably. The clamping recess 112 is arc-shaped; two conductive wires 2 are paired with two clamping blocks one-to-one, and each conductive wire 2 is sequentially arranged in the corresponding receiving groove 111 and clamping recess 112. In this embodiment, the portions of the two conductive wires 2 corresponding to the clamping recess 112 are the exposed portions 21. The exposed portions 21 are used to directly contact the test part of the tubular heater to achieve conductive connection. When the two clamping blocks are closed together, the two clamping recesses 112 together form a clamping part, which is used to clamp the test part of the tubular heater so that the tubular heater is fixed by the clamping force of the two clamping blocks cooperating with each other, while ensuring that the exposed portions 21 of the conductive wires 2 are in close contact with the test part of the tubular heater to ensure stable circuit conduction during the test.

[0035] Both conductive wires 2 mentioned above are made of materials with good conductivity. In this embodiment, both conductive wires 2 are copper braided tapes.

[0036] For ease of description, the position of the clamping recess 112 in the clamping assembly is referred to as the front of the clamping assembly, and the side of the clamping assembly away from the clamping recess 112 is referred to as the rear.

[0037] Specifically, the aforementioned tooling body 100 also includes a clamping guide rail 4, which is located on the lower side of the clamping assembly and is fixedly installed on the rear side of the clamping assembly. Two clamping blocks are slidably installed on the clamping guide rail 4, and the sliding structure between each clamping block and the clamping guide rail 4 adopts a conventional sliding structure. For example, a slider is provided on the lower side of the clamping block, and the slider is slidably installed on the clamping guide rail 4 so that the two clamping blocks can be pushed together or away from each other by an external force. A return spring is connected between the two clamping blocks. Thus, when it is necessary to clamp the tubular heater, the two clamping blocks are pulled to the sides to make them move away from each other, and the test part of the tubular heater is placed between the two clamping recesses 112. Then, the clamping blocks are released, and the two clamping blocks close together under the action of the return spring.

[0038] As a preferred method, to ensure more stable sliding of the clamping blocks and to prevent the clamping assembly 1 from shifting its clamping position due to uneven force during long-term use, and to ensure stable contact between the conductive wire 2 and the test part of the tubular heater during the test, the structure of the two clamping blocks being relatively closed or moving away from each other can also be as follows: the two clamping blocks are respectively a positioning block 11 and a sliding block 12. The rear side of the positioning block 11 is fixedly installed on the clamping guide rail 4, and the rear side of the sliding block 12 is arranged and installed on the clamping guide rail 4 in a way that allows it to approach or move away from the positioning block 11. The two can be slidably engaged in the conventional way. A fixing component 31 is fixedly installed on the outer side of the sliding block 12 away from the positioning block 11. A return spring 3 is tensioned between the outer side of the sliding block 12 away from the fixing component 31. When the return spring 3 is in its natural state, the sliding block 12 and the positioning block 11 are in a closed state so that the two clamping recesses 112 together form the clamping part mentioned above.

[0039] Furthermore, there are at least two reset springs 3, and each reset spring 3 is arranged sequentially at intervals along the length of the clamping assembly 1. In this embodiment, there are three reset springs 3, which are respectively located at the front, middle and rear of the sliding block 12 and the fixing component 31, so as to ensure that the sliding block 12 slides stably under the action of the reset springs 3.

[0040] Furthermore, the aforementioned clamping guide rail 4 can also be mounted on the mounting base 41, that is, the mounting base 41 has a mounting groove 411 in the left-right direction, and the clamping guide rail 4 is fixedly mounted on the mounting base 41. Preferably, at least two clamping guide rails 4 can be provided, and each clamping guide rail 4 is arranged adjacent to each other from front to back.

[0041] Preferably, in this embodiment, to ensure the stability of the clamping block during the sliding process, it is illustrated by taking two clamping guide rails 4 as an example. The two clamping guide rails 4 are respectively installed in the mounting groove 411, or there are two mounting grooves 411, and the two mounting grooves 411 and the two clamping guide rails 4 are respectively matched one-to-one.

[0042] Thus, when it is necessary to clamp the tubular heater, the tester can drive the sliding block 12 along the clamping guide 4 away from the positioning block 11 by external force (i.e., the two move away from each other). At this time, the return spring 3 is compressed, the distance between the sliding block 12 and the positioning block 11 increases, and the clamping part opens, so that the test part of the tubular heater can be placed between the two clamping recesses 112. After the test part is placed in place, the external force is removed, and the sliding block 12 slides along the clamping guide 4 towards the positioning block 11 under the elastic restoring force of the return spring 3 (i.e., the two move closer to each other) until the two close again, and the two clamping recesses 112 clamp the test part of the tubular heater together to achieve stable clamping.

[0043] Furthermore, the aforementioned tooling body 100 also includes an automatic opening and closing assembly. The automatic opening and closing assembly is located at the front end of the clamping assembly. The automatic opening and closing assembly includes an opening and closing handle 61 and an opening and closing portion 63. The mating sides of the positioning block 11 and the sliding block 12 are respectively provided with opening and closing grooves 62. When the positioning block 11 and the sliding block 12 are in the closed state, the two opening and closing grooves 62 together form the opening and closing portion 63. The opening and closing portion 63 is elliptical in shape. Moreover, the first end of the opening and closing handle 61 is provided as a mating end 612. The opening and closing portion 63 is adapted to the mating end 612 of the opening and closing handle 61 so that the mating end 612 of the opening and closing handle 61 can rotate at the opening and closing portion 63.

[0044] Preferably, for ease of operation, the second end of the opening and closing handle 61 is provided as a hand grip 611.

[0045] Thus, after the opening and closing handle 61 is inserted into the opening and closing part 63, the opening and closing handle 61 is rotated. Due to the shape of the mating end 612 of the opening and closing handle 61, it pushes the sliding block 12 to slide along the clamping guide rail 4 through its mating with the opening and closing part 63, thereby realizing the rapid opening and closing between the positioning block 11 and the sliding block 12, improving clamping efficiency, and ensuring the stability of sliding. When the opening and closing handle 61 is pulled out, that is, when the external force is removed, the sliding block 12 slides in the direction close to the positioning block 11 under the action of the return spring 3 until the opening and closing grooves 62 on the positioning block 11 and the sliding block 12 close together to form the opening and closing part 63.

[0046] Furthermore, to ensure the aesthetics of the tooling body 100, detachable cover plates 5 are respectively installed on the upper sides of the positioning block 11 and the sliding block 12. The two cover plates 5 extend to the adjacent automatic opening and closing components. The cover plates 5 are used to hide the receiving groove 111 and the conductive wire 2 on the corresponding clamping block. The two cover plates 5 are respectively installed on the corresponding clamping blocks using existing conventional installation structures. Each cover plate 5 is installed on the corresponding clamping block by installing detachable conventional bolts or buckle structures. In this way, when it is necessary to inspect or replace the conductive wire 2, it is convenient to remove the cover plate 5. After the operation is completed, it can be reinstalled to restore the concealment of the receiving groove 111.

[0047] Furthermore, two positioning components are respectively installed on the positioning block 11 and the sliding block 12. The positioning components on the positioning block 11 and the sliding block 12 have the same position and structure. Therefore, the positioning block 11 is used as an example for explanation. Positioning components are respectively installed on the front and rear sides of the clamping recess 112 on the positioning block 11. Both positioning components include mutually cooperating positioning screws 71 and positioning threaded holes, as well as insulating washers 72. Two positioning threaded holes are opened on the opposite side of the positioning block 11. The two positioning threaded holes are respectively located on the front and rear sides of the clamping recess 112, and the axes of the two positioning threaded holes are arranged along the width direction of the positioning block 11. The two positioning threaded holes are respectively connected to the front and rear sides of the clamping recess 112. The receiving grooves 111 are interconnected; thus, the two positioning screws 71 are screwed into the corresponding positioning threaded holes from the opposite side of the positioning block 11, and extend into the receiving grooves 111 through the positioning threaded holes. Then, the free ends of the two positioning screws 71 are pressed tightly against the exposed portion 21 of the conductive wire 2 through the insulating gasket 72. At this time, the two positioning screws 71 are respectively located at the front end of the exposed portion 21 and the position near the clamping recess 112. In this way, while ensuring that the positioning screws 71 and the exposed portion 21 are insulated from each other, the exposed portion 21 can also be positioned to prevent the conductive wire 2 from shifting during the test and affecting the conductive contact effect.

[0048] This embodiment provides a testing fixture for a tubular heater. The installation process of the tubular heater is as follows: The tester first inserts the mating end 612 of the opening and closing handle 61 into the elliptical opening and closing part 63 formed by the closing of the positioning block 11 and the sliding block 12. The tester then holds the grip part 611 of the opening and closing handle 61 and rotates it. Through the mutual cooperation between the mating end 612 and the opening and closing part, the sliding block 12 is pushed to slide along the clamping guide rail 4 away from the positioning block 11. At this time, the return spring 3 is compressed, and an opening is formed between the clamping recess 112 on the positioning block 11 and the sliding block 12, that is, the clamping part is opened. Then, the tubular heater is installed... Two conductive contact surfaces 11a (i.e., test areas) are placed between the clamping recesses 112 of the positioning block 11 and the sliding block 12 to ensure that the test area corresponds to the exposed part 21 of the conductive wire. Then, the opening and closing handle 61 is pulled out and the external force is removed. Under the action of the elastic restoring force of the return spring 3, the sliding block 12 slides along the clamping guide rail 4 toward the positioning block 11 until the positioning block 11 and the sliding block 12 close again, so that the two clamping recesses 112 clamp the test area of ​​the tubular heater together. At this time, the exposed part 21 of the conductive wire 2 is in close contact with the test area, thus completing the clamping and fixing of the tubular heating tube.

[0049] This embodiment presents a test fixture for tubular heaters. Compared with existing technologies, the test fixture of this embodiment is simple to install, and the entire installation process does not require contact with electrically conductive parts. It is safe and convenient to operate, and can adapt to the size differences of test parts of tubular heaters of different specifications. It ensures that the exposed part of the conductive wire remains in close contact with the test part during clamping, effectively avoiding contact problems caused by slight changes in the heater diameter. At the same time, the design of the automatic opening and closing component makes the clamping operation more labor-saving. Testers can quickly position the tubular heater without manually applying continuous force, which significantly reduces the operational intensity, especially in scenarios where test samples are frequently changed.

[0050] Example 2 like Figure 4-5 As shown, the difference between this embodiment and embodiment one is that there are at least two tooling bodies 100, and each tooling body 100 is arranged sequentially at intervals. The fixed part provided in each tooling body 100 is the positioning block 11 in another tooling body 100 adjacent to the opposite side of its sliding block 12.

[0051] Specifically, this embodiment also includes a substrate 200. The clamping guide rail 4 described in Embodiment 1 is mounted on the substrate 200, and the length direction of the clamping guide rail 4 is arranged along the length direction of the substrate 200. The two are fixed together by conventional methods such as bolts. Each tooling body 100 is arranged sequentially and evenly at intervals on the clamping guide rail 4, and each tooling body 100 is mounted on the clamping guide rail 4 according to the mounting method described in Embodiment 1, so that each tooling body 100 is mounted on the substrate 200 at intervals via the same clamping guide rail 4. Furthermore, in this embodiment, a mounting base 41 can also be mounted on the substrate 200 along its length direction. The mounting base 41 has a mounting groove 411, and the mounting groove 411 and the clamping guide rail 4 are respectively matched one-to-one.

[0052] Furthermore, in each pair of adjacent tooling bodies 100, a return spring 3 is tensioned between the opposite side of the sliding block 12 of one tooling body 100 and the opposite side of the positioning block 11 of the other tooling body 100. That is, the fixing component on the outer side of the opposite side of each sliding block 12 is the positioning block 11 of the adjacent tooling body 100, and there is no tooling body 100 on the outer side of the opposite side of the corresponding sliding block 12. Then, the aforementioned fixing component 31 is provided on the outer side of the opposite side of the sliding block 12. The fixing component 31 is preferably a return spring 3 fixedly installed on the clamping guide rail, and there can be at least two of them. In this way, the linkage reset is achieved through the return spring 3 between each pair of adjacent tooling bodies 100, which effectively saves installation space and simplifies the overall structure.

[0053] It should be noted that in actual use, the number of tooling bodies 100 on the clamping guide rail 4 can be flexibly increased or decreased according to the number and spacing requirements of the tubular heaters to be tested, as long as the tension of the return spring 3 between each pair of adjacent tooling bodies 100 is matched.

[0054] Furthermore, a wiring guide rail 8 is mounted on the substrate 200 along its length. The wiring guide rail 8 and the clamping guide rail 4 are arranged side by side, and the wiring guide rail 8 is located on the rear side of each tooling body 100 so that the wiring assembly in the subsequent embodiment 3 can be installed in the wiring guide rail 8.

[0055] This embodiment presents a testing fixture for tubular heaters. Compared with existing technologies, this embodiment can simultaneously test multiple tubular heaters, significantly improving testing efficiency, and is particularly suitable for rapid testing needs in mass production scenarios. Furthermore, each fixture body 100 is integrated and arranged via the same clamping guide rail 4 and base plate 200, resulting in a compact structure. In addition, the wiring guide rail 8 on the base plate 200 provides a unified installation position for the subsequent circuit connections of the testing device, facilitating the neat arrangement and maintenance of the conductive wires 2, and reducing safety hazards and troubleshooting difficulties caused by messy wiring.

[0056] Example 3 A testing apparatus for tubular heaters, such as Figure 6 As shown, the device includes a chassis 300, a controller (not shown in the figure), and a test fixture. The test fixture is the same as that described in Embodiment 1 or Embodiment 2. The test fixture is fixedly or detachably installed in the chassis 300, and the controller is located on the outside of the chassis 300.

[0057] For ease of description, the right side of the chassis door facing the tester is considered the right side, and the left side is considered the left side. The location of the chassis door is the front side of the chassis 300, and the opposite side is the rear side.

[0058] Specifically, the substrate 200 in the aforementioned test fixture can be directly fixed in the chassis 300 using conventional methods. Preferably, to facilitate the installation and removal of the tubular heater, the substrate 200 is detachably installed in the chassis 300. This detachment structure adopts an existing conventional structure, such as the left and right walls of the chassis 300 being provided with slots, and the left and right sides of the substrate 200 being inserted into the corresponding slots to achieve the installation of the substrate 200.

[0059] Furthermore, the aforementioned substrate 200 is provided with a wiring guide rail 8, on which wiring assemblies are slidably mounted. Each wiring assembly is matched one-to-one with the number of tooling bodies 100. Each wiring assembly includes two terminals, which are used to electrically connect to the two conductive wires 2 on the corresponding tooling body 100. The two terminals are also connected to the power supply terminal of the controller, which has a positive power terminal and a negative power terminal. Thus, the two conductive wires 2 on each tooling body 100 are connected to the power supply terminal of the controller through the wiring terminals, thereby forming a test circuit. In this embodiment, the wiring terminals are commercially available wiring terminals.

[0060] Furthermore, the aforementioned chassis 300 also has an operation panel on one side, which can be the right side. The operation panel integrates a power switch, a start button, an emergency stop button, and status indicator lights. Testers can control the start and stop of the test process through the operation panel and judge the current test progress and results based on the status indicator lights. For example, when the status indicator light is green, it indicates that the test is proceeding normally, while when it is red, it indicates that there is an abnormality and the machine needs to be stopped and checked in time.

[0061] Furthermore, in this embodiment, the controller can be a conventional PLC controller, that is, a conventional controller used in the field of tubular heater testing.

[0062] It should be noted that the test items for the tubular heater in this embodiment can be the same as the existing test items for conventional tubular heaters, or they can be set according to the actual situation. The chassis 300 can be adapted to the test items of the tubular heater. For example, if the tubular heater is tested in a high-temperature environment, at least one heater and / or temperature sensor can be installed in the chassis 300. The drive end of the heater is electrically connected to the signal output end of the controller, and the sampling end of the temperature sensor is electrically connected to the signal output end of the controller.

[0063] This embodiment provides a testing device for tubular heaters. Compared with the prior art, it integrates multiple tooling bodies and uses a unified controller to achieve synchronous testing and centralized control of multiple tubular heaters. Furthermore, the detachable connection between the base plate 200 and the chassis 300, as well as the standardized configuration of the wiring terminals, not only facilitates the assembly and maintenance of the device, but also allows for flexible adjustment of the number of tooling bodies 100 according to the testing requirements of different batches and specifications, greatly improving the versatility and applicability of the testing device.

[0064] The above description is only a preferred embodiment of this invention. All equivalent changes and modifications made within the scope of the claims of this utility model shall fall within the scope of the claims of this utility model.

Claims

1. A testing fixture for a tubular heater, characterized in that: The fixture includes a tooling body, which comprises a clamping assembly and two conductive wires. The clamping assembly includes two clamping blocks that are either closed or far apart from each other, with the side of the two clamping blocks facing each other as the mating side and the side facing away from each other as the separating side. The upper surfaces of the two clamping blocks are respectively provided with receiving grooves, and the mating sides of the two clamping blocks are respectively provided with clamping recesses that communicate with the receiving grooves. The two conductive wires are respectively arranged in the corresponding receiving grooves and clamping recesses, and the portions of the two conductive wires corresponding to the clamping recesses are exposed portions. When the two clamping blocks are closed together, the two clamping recesses together form a clamping portion for clamping the test part of the tubular heater.

2. The testing fixture for a tubular heater according to claim 1, characterized in that: The two clamping blocks correspond to a positioning block and a sliding block that can approach or move away from the positioning block, respectively. A fixing component is provided on the opposite side of the sliding block, and a return spring is tensioned between the opposite side and the fixing component. When the return spring is in its natural state, the sliding block and the positioning block are in a closed state so that the two clamping recesses together form the clamping part.

3. The testing fixture for a tubular heater according to claim 2, characterized in that: It also includes a clamping guide rail, which is located below the clamping assembly and away from the clamping recess, and the positioning block is mounted on the clamping guide rail, and the sliding block is slidably mounted on the clamping guide rail.

4. A testing fixture for a tubular heater according to claim 3, characterized in that: Each clamping block is equipped with a positioning component on each side corresponding to the clamping recess. Both positioning components include an insulating gasket and a positioning threaded hole and a positioning screw that cooperate with each other. Each clamping block has two positioning threaded holes on its opposite side. The two positioning threaded holes are respectively connected to the receiving groove. The free ends of the two positioning screws are respectively positioned at the clamping recess by the insulating gasket.

5. A testing fixture for a tubular heater according to claim 3, characterized in that: It also includes an automatic opening and closing component located at one end of the clamping assembly near the clamping recess. The automatic opening and closing component includes an opening and closing handle and an opening and closing part. The mating sides of the two clamping blocks are respectively provided with opening and closing grooves. When the two clamping blocks are in the closed state, the two opening and closing grooves together form an elliptical opening and closing part. The opening and closing handle is adapted to the opening and closing part.

6. A testing fixture for a tubular heater according to claim 3, characterized in that: There are at least two return springs, and each of the return springs is arranged at intervals along the length direction of the sliding block.

7. A testing fixture for a tubular heater according to claim 2, characterized in that: Each of the clamping blocks has a cover plate installed on its upper side to conceal the receiving groove.

8. A test fixture for a tubular heater according to any one of claims 3-6, characterized in that: It also includes a base plate, and there are at least two tooling bodies. The clamping guide rail is mounted on the base plate, and each tooling body is arranged at intervals on the clamping guide rail. The fixing component outside each tooling body is the positioning block in another tooling body adjacent to the opposite side of its sliding block. The fixing component outside the tooling body that does not have an adjacent tooling body on the opposite side of each tooling body is a fixing block.

9. A testing apparatus for a tubular heater, characterized in that: It includes a chassis, a controller, and a test fixture as described in claim 8, wherein the test fixture is disposed in the chassis and the controller is disposed outside the chassis.

10. A testing apparatus for a tubular heater according to claim 9, characterized in that: A wiring guide rail is mounted on the substrate along its length. The wiring guide rail and the clamping guide rail are arranged side by side, and at least two wiring groups are slidably mounted on the wiring guide rail. Each wiring group includes two terminals. The two conductive wires on each test fixture are respectively connected to the two terminals on a wiring group. The two terminals in each wiring group on the wiring guide rail are respectively connected to the positive and negative terminals of the power supply of the controller.

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