CN102305921B - Secondary line pressing mechanism used for preventive tests - Google Patents

Abstract

A secondary crimping mechanism for preventive tests relates to a secondary crimping mechanism of a transformer. At present, the secondary end of the transformer is connected manually when carrying out withstand voltage, insulation resistance and secondary turn-to-turn insulation tests, which is inefficient and heavy work. The present invention is characterized in that it includes a bracket, a strip-shaped insulating block arranged under the bracket, a cylinder arranged between the bracket and the insulating block for driving the insulating block to move up and down, a guide rod connected to the bracket and the insulating block, and a Two rows of test probes on the block are used for crimping with the secondary end of the transformer, and are used to drive the bracket to move back and forth so that the two rows of test probes can be crimped with the secondary end of the transformer in turn to complete the open circuit test, withstand voltage and Front and rear translation device for insulation resistance test; the upper end of the test probe is connected to the wire, and the lower end is the crimping end. A plurality of test probes can be connected to the secondary terminals of multiple transformers at the same time, and the wiring to the secondary terminals of the transformers can be automatically completed to improve work efficiency.

Description

Secondary crimping mechanism for preventive testing

technical field

The invention relates to a secondary crimping mechanism of a transformer.

Background technique

At present, the secondary terminals of the transformers are manually connected when the withstand voltage, insulation resistance and secondary turn-to-turn insulation tests are carried out. Especially when multiple transformers are tested at the same time, due to the large number of secondary terminals and the need for repeated wiring for different tests, it takes a lot of time and heavy work to connect in the current test.

Contents of the invention

The technical problem to be solved and the technical task proposed by the present invention are to perfect and improve the existing technical solutions, and to provide a secondary crimping mechanism for preventive testing, so as to achieve the purpose of automatic wiring and automatic verification. For this reason, the present invention takes the following technical solutions.

The secondary crimping mechanism for preventive tests is characterized in that it includes a bracket, a strip-shaped insulating block arranged under the bracket, a cylinder arranged between the bracket and the insulating block for driving the insulating block to move up and down, and a cylinder connected to the bracket and the guide rod on the insulating block, the two rows of test probes set on the insulating block for crimping with the secondary end of the transformer, used to drive the bracket to move back and forth so that the two rows of test probes can be connected to the secondary end of the transformer in turn. Terminal crimping to complete the front and rear translation device of open circuit test, withstand voltage and insulation resistance test; the upper end of the test probe is connected to the wire, and the lower end is used for crimping with the secondary winding terminal of the tested transformer end. When working, the cylinder drives the insulating block to descend, so that the test probe located on the insulating block is connected to the secondary end of the transformer. A plurality of test probes can be connected to the secondary terminals of multiple transformers at the same time, and the wiring to the secondary terminals of the transformers can be automatically completed to improve work efficiency.

As a further improvement and supplement to the above technical solutions, the present invention also includes the following additional technical features.

There are two cylinders between the bracket and the insulating block, and the two cylinders are located at both ends of the insulating block. The cylinder body of the cylinder is installed vertically downward on the lower end of the bracket through the connecting plate, and the movable end of the cylinder is fixed on the insulating block through the bottom plate. It is used to provide driving force for the up and down movement of the insulating block. Two air cylinders contribute to the smooth downward movement of the insulating block.

The lower end surface of the bracket is provided with two nut mounting grooves, and nut blocks are embedded in the grooves, the connecting plate is locked with the nut blocks in the nut mounting grooves by screws, and the cylinder body of the cylinder is fixed on the lower end surface of the connecting plate through connecting pieces to realize The cylinder block is fixed on the bracket.

The test probe cover has a spring, and the insulating block is provided with a plurality of test probe sockets matching the test probe, and the middle part of the test probe is provided with a shoulder for offsetting the spring, and the test probe cover Connect the spring and insert it into the test probe socket. The lower end of the test probe is provided with an external thread to be screwed with the copper head used to abut against the secondary end of the transformer; one end of the spring is abutted against the shoulder of the test probe, and the other end is The insulating block is pressed against each other to provide a suitable pressing force when the test probe and the secondary terminal of the transformer are pressed against each other, so that the two can be electrically connected reliably and at the same time avoid damage. The spring of the jacket of the test probe helps to transmit the driving force of the cylinder to the copper head that is opposed to the secondary end of the transformer smoothly and reliably, and the electrical connection is reliable.

The upper and lower ends of the test probe jack are provided with internal threads to be screwed with the external threads of the two bushings respectively; the bushing at the upper end of the test probe is provided with an inner thread between its lower end surface and the shoulder of the test probe. There is a spring covering the test probe; in standby mode, the shoulder of the test probe is in conflict with the bushing located at the lower end of the test probe socket under the elastic force of the spring.

The insulating block is provided with two rows of test probe jacks to insert the test probes respectively, and the two rows of test probe jacks are arranged in front and back correspondingly, and each row of test probes includes 12 test probe jacks so that a single The secondary crimping action can complete the secondary winding wiring of 6 transformers at the same time. It can connect 6 transformers at the same time with high efficiency.

The translation device includes sliders arranged at the left and right ends of the bracket, a fixed frame body provided with a chute matching the slider, front and rear drive cylinders connected to the bracket at one end and connected to the frame body at the other end; There are two guide rods, the lower end of the guide rod is fixed on the insulating block through the flange, the guide rod hole is provided on the support for passing the guide rod, the guide rod hole is provided with a sliding bearing that is overlaid on the guide rod.

The bracket is a profile, and the left and right ends of the bracket are respectively fixed with the cover plate through the connecting piece, and the outer side of the cover plate is fixed with the slider.

A guide rod hole is provided with two sliding bearings respectively fixed to the upper and lower end surfaces of the insulating block through screws.

The wires connected to the upper end of the first row of test probes are connected to the transformer open circuit tester to detect the maximum peak voltage of the secondary winding of the transformer. The 12 test probes are in groups of two, corresponding to six transformers respectively. During the open circuit test During the test, the primary winding of the transformer passes a large current, and the secondary circuit of each group of probes is in a short-circuit state. During the test, the secondary circuit of the transformer to be tested is opened in sequence through relay control, and the transformer in the open circuit state is measured by an open circuit tester. In the whole test process, only one or two transformers are open at the same time to ensure that the test power supply does not produce serious distortion; the wires connected to the upper end of the second row of test probes are short-circuited to ground through a relay or connected to a program-controlled source. During withstand voltage and insulation resistance tests, the program-controlled source is connected to the second row of test probes through relays to form a loop to detect the results of withstand voltage leakage current and insulation resistance; the lower end of the copper head is chamfered to avoid contact with the transformer during crimping. The insulation stopper in the middle of the secondary winding interferes.

Beneficial effects: a plurality of test probes can be connected to the secondary terminals of multiple transformers at the same time, and the wiring to the secondary terminals of the transformers is automatically completed, thereby improving work efficiency.

Description of drawings

Fig. 1 is a schematic diagram of the structure of the present invention.

Fig. 2 is a schematic diagram of the blasting structure of the present invention.

Fig. 3 is a schematic diagram of a half-section structure of the present invention.

In the figure: 1-bracket, 2-insulation block, 3-cylinder, 4-test probe, 5-connecting plate, 6-bottom plate, 7-spring, 8-copper head, 9-shaft sleeve, 10-flange, 11-slide bearing, 12-guide rod, 13-slide block, 14-cover plate.

Detailed ways

The technical solution of the present invention will be further described in detail below in conjunction with the accompanying drawings.

As shown in Figures 1-3, the present invention includes a bracket 1, a strip-shaped insulating block 2 arranged under the bracket 1, a cylinder 3 arranged between the bracket 1 and the insulating block 2 for driving the insulating block 2 to move up and down, connected to the The guide rod 12 on the bracket 1 and the insulating block 2, the front and rear two rows of test probes 4 arranged on the insulating block 2 for crimping with the secondary end of the transformer, and the two rows of test probes 4 used to drive the bracket to move back and forth A front and back translation device that can be crimped with the secondary end of the transformer in turn to complete the open circuit test, withstand voltage and insulation resistance test; the upper end of the test probe 4 is connected to the wire, and the lower end is used to connect with the secondary winding terminal of the tested transformer Crimp ends for crimping. Two cylinders 3 are arranged between the bracket 1 and the insulating block 2, and the two cylinders 3 are respectively arranged at both ends of the insulating block 2. The cylinder body of the cylinder 3 is installed vertically downward on the lower end surface of the bracket 1 through the connecting plate 5, and the movement of the cylinder 3 The end is fixed on the insulating block 2 through the bottom plate 6 to provide driving force for the up and down movement of the insulating block 2 . Two nut mounting grooves are provided on the lower end surface of the bracket 1, and nut blocks are embedded in the grooves. The connecting plate 5 is locked with the nut blocks in the nut mounting grooves by screws, and the cylinder body of the cylinder 3 is fixed on the lower end surface of the connecting plate 5 through connecting pieces. Realize that the cylinder body of the cylinder 3 is fixed on the support 1. The test probe 4 is covered with a spring 7, and the insulating block 2 is provided with a plurality of test probe jacks matching the test probe 4. The middle part of the test probe 4 is provided with a shoulder for offsetting the spring 7. After the spring 7 is sleeved, insert it into the test probe socket, and the lower end of the test probe 4 is provided with an external thread to be screwed with the copper head 8 used to offset the secondary end of the transformer; one end of the spring 7 is connected to the shoulder of the test probe 4 In contrast, the other end of the test probe 4 is in contact with the insulating block 2 to provide a suitable pressing force when the test probe 4 is in contact with the secondary end of the transformer so that the two are reliably electrically connected and at the same time avoid damage. The upper and lower ends of the test probe socket are provided with internal threads to be screwed with the external threads of the two shaft sleeves 9 respectively; A spring 7 covering the test probe 4 is provided; in standby mode, the shoulder of the test probe 4 is in conflict with the bushing 9 located at the lower end of the test probe socket under the elastic force of the spring 7 . Two rows of test probe jacks are provided on the insulating block 2 to respectively insert the test probes 4, and the two rows of test probe jacks are arranged correspondingly in front and back, and each row of test probes includes 12 test probe jacks so that a single The crimping action can complete the secondary winding wiring of 6 transformers at the same time. Translation device comprises the slide block 13 that is located at the left and right ends of support 1, is provided with the fixed frame body that matches chute with slide block 13, one end is connected with support 1 and the other end is connected with frame body front and back drive cylinder; Connect support 1 and insulator The guide rod 12 of block 2 is two, and the lower end of guide rod 12 is fixed on the insulating block 2 by flange 10, and the guide rod hole that is used to pass through guide rod 12 is provided on the support 1, and the guide rod hole is provided with an outer sleeve. Slide bearing 11 of guide rod 12 . The support 1 is a section bar, and its left and right ends respectively fix the cover plate 14 through connectors, and the outside of the cover plate 14 fixes the slide block 13 . A guide rod hole is provided with two sliding bearings 11 respectively connected to the upper and lower end surfaces of the insulating block 2 by screws. The wire connected to the upper end of the first row of test probes 4 is connected to the transformer open circuit tester to detect the maximum peak voltage of the secondary winding of the transformer. The 12 test probes 4 are in pairs, corresponding to six transformers respectively. During the open-circuit test, the primary winding of the transformer passes a large current, and the secondary circuit of each group of probes is in a short-circuit state. During the test, the secondary circuit of the transformer to be tested is opened in sequence through relay control, and the open-circuit state is measured by the open-circuit tester. The secondary peak voltage of the transformer, only one or two transformers are open at the same time during the whole test, to ensure that the test power supply does not produce serious distortion; During the power frequency withstand voltage and insulation resistance test, the program-controlled source is connected to the second row of test probes through the relay to form a loop to detect the withstand voltage leakage current and insulation resistance results; the lower end of the copper head 8 is chamfered to avoid the When interfering with the insulating stopper in the middle of the secondary winding of the transformer.

Claims (9)

1. The secondary crimping mechanism for preventive tests is characterized in that: it includes a bracket (1), a strip-shaped insulating block (2) arranged under the bracket (1), and an insulating block ( 2) The cylinder (3) used to drive the insulating block (2) to move up and down, the guide rod (12) connected to the bracket (1) and the insulating block (2), and the insulating block (2) for The front and back two rows of test probes (4) that are crimped with the secondary end of the transformer are used to drive the bracket to move back and forth so that the two rows of test probes (4) can be sequentially crimped with the secondary end of the transformer to complete the open circuit test. The front and rear translation device for voltage and insulation resistance tests; the upper end of the test probe (4) is connected to the wire, and the lower end is the crimping end for crimping with the secondary winding terminal of the transformer to be tested; the test The probe (4) is covered with a spring (7), and the insulating block (2) is provided with a plurality of test probe sockets matching the test probe (4), and the middle part of the test probe (4) is set for The shoulder against the spring (7), the test probe (4) is inserted into the test probe socket after the spring (7) is sleeved, and the lower end of the test probe (4) is provided with an external thread to be used for secondary contact with the transformer. The copper head (8) whose ends are against each other is screwed; one end of the spring (7) is against the shoulder of the test probe (4), and the other end is against the insulating block (2) so that the test probe (4) and the transformer two When the secondary ends are against each other, an appropriate pressing force is provided to make the two reliably electrically connected while avoiding damage. 2. The secondary crimping mechanism for preventive tests according to claim 1, characterized in that: two cylinders (3) are arranged between the bracket (1) and the insulating block (2), and the two cylinders (3) Separately located at both ends of the insulating block (2), the cylinder body of the cylinder (3) is installed vertically downward on the lower end surface of the bracket (1) through the connecting plate (5), and the movable end of the cylinder (3) is fixed through the bottom plate (6) It is used on the insulating block (2) to provide driving force for the up and down movement of the insulating block (2). 3. The secondary crimping mechanism for preventive testing according to claim 2, characterized in that: two nut mounting grooves are provided on the lower surface of the bracket (1), and nut blocks are embedded in the grooves, and the connecting plate (5) Lock the screw and the nut block in the nut installation groove, and the cylinder body of the cylinder (3) is fixed on the lower end surface of the connection plate (5) through the connecting piece, so that the cylinder body of the cylinder (3) is fixed on the bracket (1) . 4. The secondary crimping mechanism for preventive tests according to claim 1, characterized in that: the upper and lower ends of the test probe sockets are provided with internal threads to connect with the two shaft sleeves (9) respectively. The external thread of the test probe (4) is screwed; the shaft sleeve (9) at the upper end of the test probe (4) is provided with a spring (7) that is covered with the test probe (4) between its lower end surface and the shoulder of the test probe (4) ); when in standby, the shoulder of the test probe (4) is in conflict with the shaft sleeve (9) located at the lower end of the test probe socket under the elastic force of the spring (7). 5. The secondary crimping mechanism for preventive tests according to claim 1, characterized in that: the insulating block (2) is provided with two rows of test probe sockets for inserting test probes respectively (4) Two rows of test probe sockets are arranged in front and back correspondingly, and each row of test probes includes 12 test probe sockets so that a single crimping action can complete the secondary winding wiring of 6 transformers at the same time. 6. The secondary crimping mechanism for preventive tests according to claim 1, characterized in that: the translation device includes sliders (13) arranged at the left and right ends of the bracket (1), and a Block (13) is a fixed frame with a chute, one end is connected to the frame (1) and the other end is connected to the front and rear drive cylinder; the guide rod (12) connecting the frame (1) and the insulating block (2) is two One, the lower end of the guide rod (12) is fixed on the insulating block (2) through the flange (10), the guide rod hole for passing the guide rod (12) is provided on the bracket (1), and the guide rod hole is provided with The sliding bearing (11) that is overcoated on the guide rod (12). 7. The secondary crimping mechanism for preventive tests according to claim 6, characterized in that: the bracket (1) is a profile, and the left and right ends of the bracket are respectively fixed with the cover plate (14 ), and the outer side of the cover plate (14) to fix the slider (13). 8. The secondary crimping mechanism for preventive tests according to claim 1, characterized in that: a guide rod hole is provided with two slides respectively fixed to the upper and lower end faces of the insulating block (2) by screws. bearing (11). 9. The secondary crimping mechanism for preventive tests according to claim 1, characterized in that: the wire connected to the upper end of the first row of test probes (4) is connected to the transformer open circuit tester to detect the transformer two The maximum peak voltage of the secondary winding, 12 test probes (4) in pairs, corresponding to six transformers respectively, during the open circuit test, the primary winding of the transformer passes a large current, and the secondary circuit of each group of probes In the short-circuit state, the secondary circuit of the tested transformer is opened in sequence through the relay control during the test, and the secondary peak voltage of the transformer in the open-circuit state is measured by the open-circuit tester. Only one or two transformers are open at the same time during the whole test , to ensure that the test power supply does not produce serious distortion; the wires connected to the upper end of the second row of test probes (4) are short-circuited to ground through a relay or connected to a program-controlled source. The test probes are connected and form a loop to detect the withstand voltage leakage current and insulation resistance results; the lower end of the copper head (8) is chamfered to avoid interference with the insulation stopper in the middle of the secondary winding of the transformer during crimping.

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