Leakage current detection device for heater insulation shell

Abstract

The utility model discloses a leakage current detection device for a heater insulation shell, and the device enables two sliding conductive assemblies at the bottom of a leakage current tester to slide along a guide protection shell according to the length of a heating ring to be detected when leakage current detection needs to be carried out on the heating ring disposed on an injection molding machine. The distance between the two groups of sliding conductive assemblies is adapted to the length of the heating ring, then the fastening bolt is screwed to be fixedly connected with the guide protective shell, and then the leakage current tester is turned on and placed on the heating ring through the handle. The electric conduction metal sheets in the two groups of adjusted sliding electric conduction assemblies are respectively contacted with the two end parts of the heating ring shell so as to carry out leakage current detection, and when leakage current detection is carried out on the next heating ring, a detector directly moves the detection device to the heating ring to be detected through a handle so as to test the leakage current condition of the heating ring to be detected. The detection process is very convenient, the circuit does not need to be reconnected, and the detection efficiency is improved.

Description

Technical Field

[0001] This application relates to the technical field of leakage current detection, and particularly to a leakage current detection device for the insulating housing of a heater. Background Art

[0002] Leakage current testing is usually used to evaluate the insulation performance and safety of equipment. Under normal operating conditions, the current of the equipment should only flow in a predetermined conductive path. However, due to the influence of insulation aging, damage, or environmental factors, a small amount of current may flow through an undesired path, and this phenomenon is called leakage current.

[0003] In the plastic processing industry, an injection molding machine is a key equipment for plastic molding. Its heating section usually heats the screw barrel through a heater to melt the internal plastic particles and facilitate molding. The heating coils of injection molding machines usually use methods such as electric heating wires, electromagnetic induction coils, or infrared heating to achieve the heating effect. All these heating methods require current to pass through the heater and then be converted into heat energy. To prevent current leakage and ensure safety and heating efficiency, insulating and heat-conducting materials are usually provided on the body of the heating coil barrel.

[0004] However, with the long-term use of the heater and the harsh working environment, its insulation performance may gradually decline, and even leakage may occur. Leakage current not only affects the heating effect of the heating coil but also may pose a safety hazard to operators and equipment. Therefore, it is very necessary to regularly detect the leakage current of the heating coil of the injection molding machine.

[0005] Currently, the existing leakage current detection methods mainly use leakage current testers. However, in actual operation, there are some problems in the use of the detection device. Usually, the leakage current tester needs to be moved to the working area of the injection molding machine, and conductive films or other conductive materials are set at both ends of the heating coil on the screw barrel of the injection molding machine. After connecting the conductive films at both ends of the heating coil to the leakage current tester through connecting wires, the test is carried out. This operation process is cumbersome, inconvenient when connecting the detection circuit, and the circuit needs to be reconnected every time the leakage current of a heating coil is detected, which is time-consuming and laborious and reduces the detection efficiency. Summary of the Utility Model

[0006] Aiming at the deficiencies of the existing technology, the purpose of this application is to provide a leakage current detection device for the insulating housing of a heater to solve the problems put forward in the above background art.

[0007] According to one aspect of the present application, a leakage current detection device for a heater insulation housing includes a leakage current tester, a guiding protective housing, and a sliding conductive component. It is characterized in that the guiding protective housing is fixedly provided at the bottom of the leakage current tester. The guiding protective housing is of a strip-shaped structure, and the bottom of the guiding protective housing is open. Two sets of symmetrically arranged sliding conductive components are slidably provided in the guiding protective housing, and each set of the sliding conductive components vertically extends beyond the bottom opening of the guiding protective housing. The sliding conductive component includes a vertical support frame, a wire fixing sleeve, a connecting wire, and a conductive metal sheet. The two sides of the top of the vertical support frame are slidably connected to the two inner side walls of the guiding protective housing. The bottom of the vertical support frame is fixedly connected to the conductive metal sheet. A vertically arranged wire fixing sleeve is fixedly provided in the middle of the vertical support frame, and the bottom end of the wire fixing sleeve extends to the top of the conductive metal sheet. A connecting wire is arranged in the wire fixing sleeve, and one end of the connecting wire is electrically connected to the conductive metal sheet, and the other end of the connecting wire is electrically connected to the leakage current tester.

[0008] Preferably, L-shaped locking plates are fixedly provided on both side walls of the vertical support frame located below the guiding protective housing. The vertical part of the L-shaped locking plate is located outside the guiding protective housing, and the vertical part of the L-shaped locking plate is parallel to the outer side wall of the guiding protective housing. A fastening bolt is threadedly connected through the vertical part of the L-shaped locking plate, and the end of the fastening bolt can be in contact with the outer side wall of the guiding protective housing.

[0009] Preferably, a conductive connecting sleeve is fixedly provided on the top of the conductive metal sheet. One end of the connecting wire is inserted into the conductive connecting sleeve and fixedly connected through a conductive screw. The outer diameter dimension of the conductive connecting sleeve is consistent with the inner diameter dimension of the wire fixing sleeve. The wire fixing sleeve is inserted outside the conductive connecting sleeve, and the conductive screw is sequentially screwed into the wire fixing sleeve and the conductive connecting sleeve to be fixedly connected to the connecting wire.

[0010] Preferably, both sides of the conductive metal sheet are bent downward to form an isosceles trapezoidal structure.

[0011] Preferably, a guiding rope is fixedly provided inside the guiding protective housing along its length direction. The connecting wire is spirally lapped on the guiding rope.

[0012] Preferably, a partition plate is fixedly provided in the middle of the guiding protective housing along its length direction. The guiding rope is located above the partition plate, and the top surface of the vertical support frame is in sliding contact with the bottom surface of the partition plate. A communication groove is longitudinally penetrated through the middle of the partition plate, and the connecting wire passes through the communication groove.

[0013] Preferably, sliding guide rails are symmetrically arranged on both inner side walls of the guiding protective shell, and sliding blocks are fixedly arranged on both side walls at the top of the vertical support frame. The vertical support frame is slidably arranged in the sliding guide rails through the sliding blocks and is slidably connected to the guiding protective shell.

[0014] Preferably, a handle is fixedly arranged on the top of the leakage current tester.

[0015] Preferably, both the vertical support frame and the wire fixing sleeve are made of insulating materials.

[0016] The advantages of this application compared with the prior art are as follows: For a leakage current detection device for the insulating shell of a heater in this application, when it is necessary to detect the leakage current of the heating coil set on an injection molding machine, according to the length of the heating coil to be detected, the vertical support frames in the two groups of sliding conductive components on this detection device are slid along the guiding protective shell towards its two ends, so that the distance between the two groups of sliding conductive components adapts to the length of the heating coil. Then, tighten the fastening bolts to fixedly connect the vertical support frame with the guiding protective shell. Then, turn on the leakage current tester and place it on the heating coil through the handle, so that the conductive metal sheets in the two groups of adjusted sliding conductive components are respectively in contact with the two end parts of the heating coil shell. Furthermore, the corresponding data measured will be displayed on the leakage current tester, and the detection personnel analyze it to judge the leakage current situation. Then, when detecting the leakage current of the next heating coil, the detection personnel can directly move this detection device from the previously detected heating coil to the heating coil to be detected through the handle to test its leakage current situation. This detection process is very convenient, without the need to reconnect the circuit, improving the detection efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a perspective view of a leakage current detection device for the insulating shell of a heater according to an embodiment of the present application.

[0018] Figure 2 is a main cross-sectional view of a leakage current detection device for the insulating shell of a heater according to an embodiment of the present application.

[0019] Figure 3 is a side cross-sectional view of a leakage current detection device for the insulating shell of a heater according to an embodiment of the present application.

[0020] Figure 4 is Figure 2 a schematic enlarged view of the structure of part A in

[0021] Figure 5 is Figure 3 a schematic enlarged view of the structure of part B in

[0022] Figure 6It is a three-dimensional structural schematic diagram during the detection of a leakage current detection device for a heater insulation housing according to an embodiment of the present application.

[0023] Reference numerals: 1, leakage current tester; 2, guiding protective housing; 3, sliding conductive assembly; 31, vertical support frame; 32, wire fixing sleeve; 33, connecting wire; 34, conductive metal sheet; 35, conductive connecting sleeve; 36, conductive screw; 4, L-shaped locking plate; 5, fastening bolt; 6, guiding rope; 7, partition plate; 8, communication groove; 9, sliding guide rail; 10, slider; 11, handle; 12, heating coil. Detailed implementation manners

[0024] In order to make the content of the present application easier to be clearly understood, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. It should be noted that the words "front", "rear", "left", "right", "up" and "down" used in the following description refer to the directions in the Figure 2 accompanying drawings, and the words "inner" and "outer" respectively refer to the directions towards or away from the geometric center of a specific component.

[0025] As Figures 1 to 6As shown, a leakage current detection device for an insulating shell of a heater comprises a leakage current tester 1, a guide protective shell 2 and a sliding conductive component 3. A handle 11 is fixedly provided on the top of the leakage current tester 1 to facilitate the tester to hold it during the test. A guide protective shell 2 is fixedly provided at the bottom of the leakage current tester 1. The guide protective shell 2 is a long strip structure, and the bottom of the guide protective shell 2 is an opening. Two sets of symmetrically arranged sliding conductive components 3 are slidably provided in the guide protective shell 2. Specifically, the sliding conductive component 3 comprises a vertical support frame 31, a wire fixing sleeve 32, a connecting wire 33 and a conductive metal sheet 34. Sliding guide rails 9 are symmetrically provided on the inner side walls of the guide protective shell 2. The vertical support Slide blocks 10 are fixed on the two side walls at the top of the frame 31. The vertical support frame 31 is slidably arranged in the sliding guide rail 9 through the slide blocks 10 and is slidably connected to the guide protective shell 2. The vertical support frame 31 extends vertically beyond the bottom opening of the guide protective shell 2. The bottom of the vertical support frame 31 is fixedly connected to the conductive metal sheet 34 by screws. The two sides of the conductive metal sheet 34 are bent downward to form an isosceles trapezoidal structure to facilitate the conductive metal sheet 34 to contact the outer shell of the heating coil 12. A vertically arranged wire fixing sleeve 32 is fixed in the middle of the vertical support frame 31. The vertical support frame 31 and the wire fixing sleeve 32 are both made of insulating materials, and the bottom end of the wire fixing sleeve 32 extends to the top of the conductive metal sheet 34. The conductive metal sheet 34 is A conductive connection sleeve 35 is fixedly provided on the top of the sheet 34. The outer diameter of the conductive connection sleeve 35 is consistent with the inner diameter of the wire fixing sleeve 32. The wire fixing sleeve 32 is inserted outside the conductive connection sleeve 35. A connecting wire 33 is arranged in the wire fixing sleeve 32. One end of the connecting wire 33 is inserted into the conductive connection sleeve 35 and is screwed into the wire fixing sleeve 32 and the conductive connection sleeve 35 in sequence by a conductive screw 36 to fix them. The other end of the connecting wire 33 is electrically connected to the leakage current tester 1 to ensure that the signal generated when the conductive metal sheet 34 contacts the outer shell of the heating coil 12 can be fed back to the leakage current tester 1; in addition, a conductive screw 36 is fixedly provided inside the guide protective shell 2 along its length direction. There is a guide rope 6, and the connecting wire 33 is overlapped on the guide rope 6 in a spiral shape, and the length of the connecting wire 33 is long enough to ensure that the connecting wire 33 can extend and move with the sliding vertical support frame 31, and a partition plate 7 is fixedly provided in the middle part of the guide protection shell 2 along its length direction, and the guide rope 6 is located above the partition plate 7, that is, the connecting wire 33 is located above the partition plate 7, so that the partition plate 7 can play a certain protective role for the connecting wire 33, and a connecting groove 8 is opened in the middle part of the partition plate 7 along its length direction, and the connecting wire 33 can pass through the connecting groove 8, and the top surface of the vertical support frame 31 is in sliding contact with the bottom surface of the partition plate 7, thereby enhancing the movement stability of the vertical support frame 31;In addition, L-shaped locking plates 4 are fixedly provided on both side walls of the vertical support frame 31 located below the guiding protective shell 2. The vertical portions of the L-shaped locking plates 4 are located outside the guiding protective shell 2 and are parallel to the outer side wall of the guiding protective shell 2. A fastening bolt 5 is threadedly connected through the vertical portion of the L-shaped locking plate 4, and the end of the fastening bolt 5 can abut against the outer side wall of the guiding protective shell 2. This setting can lock the vertical support frame 31 after its sliding adjustment, avoiding the sliding of the vertical support frame 31 during detection and affecting the detection result.

[0026] Working principle: When it is necessary to detect the leakage current of the heating coil 12 provided on the injection molding machine, according to the length of the heating coil 12 to be detected, the vertical support frames 31 in the two sets of sliding conductive components 3 on this detection device are slid along the sliding guide rail 9 on the guiding protective shell 2, so that the distance between the conductive metal sheets 34 provided at the bottoms of the two vertical support frames 31 adapts to the length of the heating coil 12. Then, the fastening bolt 5 is tightened to fixedly connect the vertical support frame 31 with the guiding protective shell 2. Then, the leakage current tester 1 is turned on and placed on the heating coil 12 through the handle 11, so that the conductive metal sheets 34 in the two sets of adjusted sliding conductive components 3 are respectively in contact with the two end portions of the outer shell of the heating coil 12. Then, the corresponding measured data will be displayed on the leakage current tester 1. The detection personnel analyze it to judge the leakage current situation. Then, when detecting the leakage current of the next heating coil 12, the detection personnel can directly move this detection device from the previously detected heating coil 12 to the heating coil 12 to be detected through the handle 11 to test its leakage current situation. This detection process is very convenient, without the need to reconnect the circuit, improving the detection efficiency.

[0027] The above embodiments are only used to illustrate the technical solutions of the embodiments of the present application, and are not intended to limit them. Although the embodiments of the present application have been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that without departing from the spirit and scope defined by the claims of the present application, they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacement of some of the technical features.

Claims

1. A leakage current detection device for an insulating housing of a heater, comprising a leakage current tester (1), a guide protective housing (2) and a sliding conductive component (3), characterized in that: A guide protection shell (2) is fixedly provided at the bottom of the leakage current tester (1); the guide protection shell (2) is a long strip structure, and the bottom of the guide protection shell (2) is open; two groups of sliding conductive components (3) are symmetrically arranged in the guide protection shell (2), and each group of sliding conductive components (3) is vertically extended beyond the bottom opening of the guide protection shell (2); the sliding conductive components (3) include a vertical support frame (31), a wire fixing sleeve (32), a connecting wire (33) and a conductive metal sheet (34); the top two sides of the vertical support frame (31) are The guide protective shell (2) is slidably connected to the two inner side walls, the bottom of the vertical support frame (31) is fixedly connected to the conductive metal sheet (34), a vertically arranged wire fixing sleeve (32) is fixedly arranged in the middle of the vertical support frame (31), and the bottom end of the wire fixing sleeve (32) extends to the top of the conductive metal sheet (34), a connecting wire (33) is arranged in the wire fixing sleeve (32), and one end of the connecting wire (33) is electrically connected to the conductive metal sheet (34), and the other end of the connecting wire (33) is electrically connected to the leakage current tester (1).

2. A leakage current detection device for a heater insulating housing according to claim 1, characterized in that: L-shaped locking plates (4) are fixedly provided on both side walls of the vertical support frame (31) located below the guide protective shell (2); the vertical portion of the L-shaped locking plate (4) is located outside the guide protective shell (2), and the vertical portion of the L-shaped locking plate (4) is parallel to the outer side wall of the guide protective shell (2); a fastening bolt (5) is threadedly connected and penetrated on the vertical portion of the L-shaped locking plate (4), and the end of the fastening bolt (5) can contact the outer side wall of the guide protective shell (2).

3. A leakage current detection device for a heater insulating housing according to claim 1, characterized in that: A conductive connection sleeve (35) is fixedly provided on the top of the conductive metal sheet (34), one end of the connecting wire (33) is inserted into the conductive connection sleeve (35) and fixedly connected by a conductive screw (36), and the outer diameter of the conductive connection sleeve (35) is consistent with the inner diameter of the wire fixing sleeve (32), the wire fixing sleeve (32) is inserted outside the conductive connection sleeve (35), and the conductive screw (36) is screwed into the wire fixing sleeve (32) and the conductive connection sleeve (35) in sequence to be fixedly connected to the connecting wire (33).

4. A leakage current detection device for a heater insulating housing according to claim 3, characterized in that: Both sides of the conductive metal sheet (34) are bent downward to form an isosceles trapezoidal structure.

5. A leakage current detection device for a heater insulating housing according to claim 1, characterized in that: A guide rope (6) is fixedly arranged inside the guide protection shell (2) along its length direction, and the connecting wire (33) is overlapped on the guide rope (6) in a spiral shape.

6. A leakage current detection device for a heater insulating housing according to claim 5, characterized in that: A partition plate (7) is fixedly provided in the middle of the guide protection shell (2) along its length direction, the guide rope (6) is located above the partition plate (7), and the top surface of the vertical support frame (31) is in sliding contact with the bottom surface of the partition plate (7), and a connecting groove (8) is opened in the middle of the partition plate (7) along its length direction, and the connecting wire (33) passes through the connecting groove (8).

7. A leakage current detection device for a heater insulating housing according to claim 1, characterized in that: Sliding guide rails (9) are symmetrically arranged on the inner side walls of the guide protection shell (2), and sliding blocks (10) are fixedly arranged on the top side walls of the vertical support frame (31). The vertical support frame (31) is slidably arranged in the sliding guide rails (9) through the sliding blocks (10) and is slidably connected to the guide protection shell (2).

8. A leakage current detection device for a heater insulating housing according to claim 1, characterized in that: A handle (11) is fixedly provided on the top of the leakage current tester (1).

9. A leakage current detection device for a heater insulating housing according to claim 1, characterized in that: The vertical support frame (31) and the wire fixing sleeve (32) are both made of insulating materials.

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