Automatic positioning complete set of devices and methods for current transformer test electrical connection

Abstract

The present invention discloses an automatic positioning complete set of devices and methods for current transformer test electrical connection, including: a transformer positioning tooling, a tooling movement control device, and a transformer crimping and positioning device; the transformer positioning tooling is conveyed to a predetermined station through the tooling movement control device, the transformer crimping and positioning device is arranged above the tooling movement control device, the transformer positioning tooling adapts to the preliminary positioning of different types of transformers, and with the conveyance and adjustment of the tooling movement control device, finally, the crimping detection of the transformer is realized through the transformer crimping and positioning device. The automatic positioning complete set of devices of the present invention is applicable to the automatic crimping and positioning of electrical test electrical connections of single-series different models of current transformers, and is widely used in the automation of product factory inspection of transformer manufacturing enterprises.

Description

Technical Field

[0001] The present invention discloses a complete set of devices and methods for automatic positioning of test electrical connections of current transformers, which relates to the field of automation of factory inspection of power transformer products. Background Art

[0002] At present, the product inspection assembly lines of power transformer manufacturing enterprises all adopt manual operation modes, with high labor costs, high labor intensity, low efficiency, and high personal safety risks. Therefore, it is very necessary to realize the unmanned automation of the product inspection assembly line. And the automation of electrical test electrical connections of transformers is an essential technical means for the automation assembly line. And automatic positioning of connection terminals, providing perception targets for automatic devices, and implementing fixed-point crimping are the keys to electrical connection automation. At present, the existing devices using manipulator servo mechanism positioning method and robot vision positioning method are mostly of the "universal" type, with complex structures and high costs, and are only suitable for the detection modes of non-standardized transformer positioning and user procurement acceptance. However, transformer manufacturing enterprises have complete self-control, and the transformers are multi-series standardized transformers of fixed types, with single types and orderly models. Physical positioning methods can be fully adopted according to local conditions to achieve the corresponding purposes in a simple, economical and efficient way. Therefore, there is a need for an automatic electrical connection positioning system and technology suitable for the detection of single-variety and multi-model standardized transformers, and which can be popularized and applied to the corresponding automation detection assembly line, which is very necessary for transformer manufacturing enterprises. Summary of the Invention

[0003] The technical problem to be solved by the present invention is that in the automatic detection assembly line of current transformers, there is a need for a device that can meet the automatic crimping and positioning of single-variety and multi-model series current transformers to achieve full automation of electrical tests in the product factory inspection assembly line of transformer manufacturing enterprises.

[0004] To solve the above technical problem, the present invention provides a complete set of devices for automatic positioning of test electrical connections of current transformers, including: a transformer positioning tooling, a tooling movement control device, and a transformer crimping and positioning device; the transformer positioning tooling is transported to a predetermined station through the tooling movement control device, and the transformer crimping and positioning device is arranged above the tooling movement control device. The transformer positioning tooling is used to define the position of the chassis of the transformer to be tested and the initial positioning of the transformer. The tooling movement control device is used to transport the positioning tooling and adjust its moving direction. The transformer crimping and positioning device is used to perform alignment on the terminals of the transformer to be tested and crimp the electrical contacts.

[0005] The transformer positioning tooling structure includes an adjustable U-shaped bracket, and the adjustable U-shaped bracket and a pair of clamping angles are arranged on the surface of the tooling tray; the adjustable U-shaped bracket includes two parallel step-shaped profiles and a sliding positioning baffle, and the sliding positioning baffle can slide along the fixed slide groove in the tray to adjust the length of the limit space of the chassis of the transformer to be tested, and is used for limiting the series of transformers of different lengths and models; the adjustable U-shaped bracket and the clamping angles are both step-shaped metal components, which are used for limiting the series of transformers of two different widths.

[0006] The above-mentioned current transformer test electrical connection automatic positioning complete set of equipment, the tooling pallet is a rectangular hollow plywood, the hollow plywood is used to position the insertion of the fork during tooling transportation; the four corners of the tooling pallet are chamfered with a radius of 25mm; the tooling pallet is made of wooden insulating material with a friction coefficient greater than 0.8 to ensure the moving friction between the tooling pallet and the transmission device.

[0007] The above-mentioned current transformer test electrical connection automatic positioning complete set, the upper surface of the tooling tray is covered with a stainless steel metal plate, which also serves as a test grounding plate, forms a conductor connection with the transformer metal base, and is used as a ground electrode for the transformer test.

[0008] The above-mentioned current transformer test electrical connection automatic positioning complete set of equipment, the tooling tray is provided with a slide groove, which is used for the sliding track of the sliding positioning baffle; the tooling tray is also engraved with the transformer fixing direction mark and the sliding positioning baffle stop line to ensure that the transformer is placed in the correct direction and accurately positioned; the sliding positioning baffle is provided with a rotatable bolt, and when the edge of the baffle coincides with the stop line, the bolt is tightened to prevent the limited transformer from sliding.

[0009] The above-mentioned current transformer test electrical connection automatic positioning complete set, the tooling movement control device includes: a tooling transmission device, a tooling position sensor, a tooling guide plate and a tooling stop mechanism; the tooling transmission device is a roller conveyor, which is composed of a plurality of belt conveyor sections; the tooling position sensor is arranged on the side of the roller conveyor at a predetermined workstation, and when the transformer positioning tooling is in place, the braking of the tooling transmission device motor and the start-up of the tooling stop mechanism are controlled; the tooling guide plate is arranged at the front end of the predetermined workstation of the tooling transmission device, and the horizontal angle of the tooling guide plate is 7°. The chamfered arc surface of the tooling tray and the sliding surface of the tooling guide plate form a reverse force, so that the positioning tooling approaches the specified positioning direction; the tooling stop mechanism is arranged at the end of the predetermined workstation of the tooling transmission device, and cooperates with the tooling position sensor to block the movement of the transformer positioning tooling, and form a positioning constraint on the direction of travel of the transformer positioning tooling.

[0010] The aforementioned automatic positioning complete set of devices for current transformer test electrical connection is characterized in that the transformer crimping and positioning device includes a crimping cylinder. The top of the crimping cylinder is connected to a cylinder positioning bracket through a cylinder positioning plate, and the bottom is connected to a lower crimping insulating block through a cylinder connecting plate. Two electrical crimping plates are symmetrically connected to the lower side of the crimping insulating block, and each electrical crimping plate is connected to a crimping copper bar through 4 groups of crimping spring assemblies, forming crimping electrical contacts for a pair of terminals of the transformer.

[0011] In the aforementioned automatic positioning complete set of devices for current transformer test electrical connection, the crimping copper bars are a pair of longitudinally long strips arranged oppositely with a gap of 2 cm and dimensions of 24 cm × 6 cm. The bottom surface of the copper bars is covered with a copper braided soft pad and fixed by corresponding pressing strips.

[0012] A positioning method based on the aforementioned automatic positioning complete set of devices for current transformer test electrical connection includes the following steps:

[0013] The transformer to be tested is hoisted into the transformer positioning tooling. The narrow transformer can be clamped at the bottom layer of the adjustable U-shaped bracket and the clamping angle step, and directly contact the stainless steel metal plate. The wide transformer can be clamped at the upper layer of the step and placed on the steps of the adjustable U-shaped bracket and the clamping angle. The sliding positioning bar slides to the corresponding stop line. If its edge can completely coincide with the stop line, it is confirmed that the positioning is accurate; otherwise, the transformer is hoisted again for adjustment until the edge of the positioning bar completely coincides with the stop line, ensuring that the positioning reference point (X 0 , Y 0 , Z 0 ) of the primary terminal of the transformer is accurately positioned relative to the space coordinate of the tooling tray;

[0014] When the transformer positioning tooling approaches the working station through the tooling transmission device, it touches the tooling guide plate, adjusts its traveling direction angle, and slowly slides along the edge of the tooling transmission device towards the predetermined working station, gradually adjusting the Y coordinate towards the positioning reference coordinate point (X 定 , Y 定 , Z 定 ) of the crimping device. The Y coordinate of the terminal positioning is adjusted to Y 定 + △Y, where △Y is the adjustment distance of the guide plate. Finally, Y 0 + △Y = Y 0 + △Y = Y 定 ;

[0015] After the transformer positioning tooling enters the predetermined working station along the tooling guide plate, it triggers the tooling position sensor. The PLC controller shuts down the drive motor of the tooling transmission device and simultaneously starts the tooling stop mechanism to lift it. The inertial movement causes the transformer positioning tooling to touch the stop mechanism and move in the reverse direction. The PLC controller starts the roller drive motor again to move the positioning tooling forward to the position. The X coordinate of the terminal positioning of the transformer to be tested is adjusted to X 0 + X1 , X 1 is the stroke of the tooling in the transmission device, and finally X 0 +X 1 =X 定 ;

[0016] The press-fitting positioning device of the mutual inductor takes the geometric center of the press-fitted copper bar as the reference point, and takes the spatial position of the reference point after the press-fitting cylinder presses down and moves as the positioning coordinate origin (X 定 , Y 定 , Z 定 ). Then the positioning coordinate point of the reference point in the initial working state of the press-fitting device for the press-fitted copper bar is (X 定 , Y 定 , Z 定 +Z 1 ), and Z 1 is the stroke of the press-fitting cylinder; the cylinder and the cylinder positioning bracket form fixed X 定 , Y 定 coordinates, and the reciprocating up and down movement of the cylinder forms the change amount Z 1 of the Z coordinate, which is related to the compression length of the compressed spring; the press-fitting cylinder of the press-fitting positioning device of the mutual inductor moves vertically downward to the specified stroke, and the press-fitted copper bar is compressed to the end of the cylinder stroke through the spring mechanism, and the Z coordinate of the press-fitted copper bar becomes Z 定 +Z 1 -Z 1 =Z 定 , and the cylinder stroke and the elastic variable of the compression spring ensure that Z 定 =Z 0 ; finally, through the mutual inductor positioning tooling and the tooling movement control device, the spatial position (X 0 +X 1 Y 0 +△Y, Z 0 ) of the terminal of the mutual inductor to be measured coincides with the positioning origin (X 定 , Y 定 , Z 定 ) of the copper bar of the press-fitting device, so as to realize the accurate alignment / positioning and press-fitting of the press-fitting device and the terminal of the mutual inductor to be measured.

[0017] For the foregoing positioning method, the positioning X 定 coordinate of the mutual inductor press-fitting device has the same or equivalent predetermined position parameters as the stop mechanism. After the positioning tooling touches the stop device, X 0 +X 1 =X 定 ; the vertical middle plane in the Y-axis direction of the press-fitted copper bar theoretically coincides with the vertical middle plane in the Y-axis direction of the terminal of the mutual inductor to be measured, and the press-fitted copper bar of the mutual inductor press-fitting positioning device completes the alignment in the X direction with the terminal of the mutual inductor to be measured.

[0018] In the foregoing positioning method, the crimping copper bar is strip-shaped, and its length direction coincides with the Y-axis, so that the X coordinates of the transformer terminals at different positions in the Y-axis direction intersect with it, realizing the crimping and positioning of various transformers by the transformer crimping and positioning device; on the other hand, the width direction of the crimping copper bar coincides with the X-axis, and the width dimension and tolerance of the transformer terminal are included within the width dimension range of the crimping copper bar, eliminating the influence of the process error of the transformer terminal on the positioning accuracy.

[0019] Beneficial effects achieved by the present invention: An automatic positioning complete set of devices for current transformer test electrical connection of the present invention, the transformer positioning tooling structure includes an adjustable U-shaped bracket, and the adjustable U-shaped bracket includes two parallel stepped profiles and a sliding positioning bar. The sliding positioning bar can slide along the fixed chute in the tray to adjust the limiting space length of the chassis of the transformer to be tested, for limiting series transformers of different lengths. The adjustable U-shaped bracket and the corner are both stepped metal components, used for limiting series transformers of two different widths.

[0020] The automatic positioning complete set of devices for current transformer test electrical connection of the present invention abandons complex devices such as traditional servo motors and robot vision positioning, and high-cost and low-efficiency positioning methods. It adopts workpiece movement and mechanical control, and the positioning device is simple and low-cost; the transformer positioning tooling is designed with stepped profiles, mobile bars, and non-closed limiting structures, saving about 60% of the corresponding materials.

[0021] In addition, the automatic positioning complete set of devices for current transformer test electrical connection of the present invention can further expand the variety of transformers accommodated by expanding the number of steps of the profile and adjusting the size of the positioning bar chute, making the positioning tooling more adaptable; by changing the size of the crimping copper bar, the crimping type of the transformer terminal can be further expanded, and the variety of transformers for crimping can be expanded; further, by replicating the device type and modifying the positioning physical parameters, it can also be applied to the crimping and positioning of other types of transformer detection; the electrical contact crimping copper bar of the present invention has a uniform distribution of spring pressure and a copper braided soft pad design on the bottom surface of the copper bar, which can fully increase the electrical contact pressure and contact area, reduce the contact resistance and slow down the crimping impact, thereby avoiding the heating effect of the electrical contact current and reducing the wear of the contact surface of the contact. Description of the Drawings

[0022] Figure 1 It is a structural schematic diagram of the present invention;

[0023] Figure 2 It is a structural schematic diagram of the transformer positioning tooling of the present invention;

[0024] Figure 3 It is a top view of the transformer positioning tooling structure of the present invention;

[0025] Figure 4 It is a structural schematic diagram of the transformer crimping and positioning device of the present invention;

[0026] Figure 5 This is an exploded view of the structure of the press-fitting and positioning device for the mutual inductor of the present invention;

[0027] Figure 6 This is a schematic diagram of the composition of the tooling movement control device of the present invention;

[0028] Figure 7 This is a schematic diagram of the positioning principle of the present invention. Detailed implementation manners

[0029] The implementation of the technical solution will be further described in detail below with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and cannot be used to limit the protection scope of the present invention.

[0030] As Figures 1 to 6 An embodiment provided: This embodiment provides an automatic positioning complete set of devices for current transformer test electrical connection, including: a mutual inductor positioning tooling 1, a mutual inductor press-fitting and positioning device 2, and a tooling movement control device 3; the mutual inductor press-fitting and positioning device 2 is arranged above the tooling movement control device 3, the mutual inductor positioning tooling 1 is moved to a predetermined working position through the tooling movement control device 3, the mutual inductor positioning tooling 1 is used for chassis limit positioning of the to-be-tested mutual inductor 4, the tooling movement control device 3 is used for transmitting the positioning tooling 1 and adjusting its moving direction, and the mutual inductor press-fitting and positioning device 2 is used for aligning the terminals of the to-be-tested mutual inductor 4 and pressing the electrical contacts.

[0031] The structure of the mutual inductor positioning tooling 1 includes: a tooling tray 11, an adjustable U-shaped holder 12, and a pair of clamping corners 13. The adjustable U-shaped holder 12 and the pair of clamping corners 13 are arranged on the surface of the tray 11. The structure of the adjustable U-shaped holder 12 includes: two parallel stepped profiles and a sliding positioning stop bar. The sliding positioning stop bar can slide along the fixed chute 15 in the tooling tray 11 to adjust the length of the limiting space for the mutual inductor chassis, so as to meet the limiting requirements of series mutual inductors of different (chassis) length models. Both the adjustable U-shaped holder and the clamping corners are stepped metal components, which can adapt to the limiting of series mutual inductors of two different (chassis) widths. The tooling tray 11 is a rectangular hollow splint, and the hollow of the splint is used for the insertion of the forklift during the handling of the positioning tooling. The four corners of the tooling tray 11 are designed with a chamfer with a radius of 25 mm. The tooling tray 11 is made of a wood insulating material with a friction coefficient greater than 0.8 to ensure the moving friction between it and the transmission device. The upper surface of the tooling tray 11 is covered with a stainless steel metal plate, which also serves as the test grounding plate 14 and can form a conductor connection with the metal base of the mutual inductor 4 and be used as the ground electrode for the mutual inductor test. The tooling tray 11 is provided with a chute 15 for the sliding track of the sliding positioning stop bar. The tooling tray 11 is engraved with the positioning direction mark of the mutual inductor 4 and the stop line of the sliding positioning stop bar to ensure the correct placement direction and accurate positioning of the mutual inductor 4. The sliding positioning stop bar is provided with a rotatable bolt. When the edge of the stop bar coincides with the stop line, the bolt is tightened to prevent the limited mutual inductor from sliding.

[0032] The mutual inductor crimping positioning device 2 includes: a cylinder positioning bracket 5, a cylinder positioning plate 29, a crimping cylinder 21, a cylinder connecting plate 22, a crimping insulating block 23, an electrical crimping plate 24, a crimping spring assembly 25, a crimping copper bar 26, a braided soft pad 27, and corresponding pressing strips 28. The top of the crimping cylinder 21 is connected to the cylinder positioning bracket 5 through the cylinder positioning plate 29. The upper side of the cylinder connecting plate 22 is connected to the crimping cylinder 21, and the lower side of the cylinder connecting plate 22 is connected to the crimping insulating block 23. The lower side of the crimping insulating block 23 is symmetrically connected to two electrical crimping plates 24. Each electrical crimping plate 24 is respectively connected to the crimping copper bar 26 through 4 crimping spring assemblies 25 to form the crimping electrical contacts for a pair of terminals of the mutual inductor 6. The crimping spring assembly 25 includes: a spring 251 and a bolt 252. The spring 251 is sleeved on the bolt 252. 4 groups of spring assemblies are connected between the crimping copper bar 26 and the crimping plate 24 to provide uniform pressure, ensure crimping balance and output greater pressure, reduce the contact resistance, and realize the optimized design of electrical contact.

[0033] The crimping copper bars 26 are 2 bars with a size of 24 cm × 6 cm, arranged opposite to each other with a gap of 2 cm, which can meet the requirements of crimping terminals of more types of transformers in the length direction; the bottom surface is covered with a copper braided soft pad 27, which is pressed by a pressure strip 28 and then fixed with screws. The braided soft pad makes the electrical contact flexible and fully increases the electrical contact surface, further reduces the contact resistance, and avoids the heating effect of the current; at the same time, it can slow down the crimping impact force, reduce the crimping wear of the electrical contact, and increase its life.

[0034] The tooling movement control device 3 includes: a tooling position sensor 6, a tooling transmission device 31, a tooling guide plate 32 and a tooling stopping mechanism 33; the tooling transmission device 31 is a roller conveyor, which is composed of a plurality of belt conveyor sections; the tooling position sensor 6 is arranged at a predetermined workstation and on the side of the tooling transmission device 31, and is used to detect when the tooling is in place, control the braking of the transmission device motor and the start of the pallet 11 stopping mechanism; the tooling guide plate 32 is arranged at the front end of the predetermined workstation of the transmission device, and the horizontal angle of the tooling guide plate 32 is 7°. The chamfered arc surface of the tooling pallet 11 and the cross-section of the tooling guide plate 32 slide together to form a maximum reverse force, so that the positioning tooling approaches the specified positioning direction; the tooling stopping mechanism 33 is arranged at the end of the predetermined workstation of the tooling transmission device, and cooperates with the tooling position sensor 6 to block the movement of the transformer positioning tooling 1 and form a positioning constraint on the traveling direction of the transformer positioning tooling 1.

[0035] like Figure 7 As shown, a positioning method based on the above-mentioned current transformer test electrical connection automatic positioning complete set device includes the following steps: the transformer 4 to be tested is hoisted into the transformer positioning fixture 1, and the narrow (chassis) transformer is clamped at the bottom of the adjustable U-shaped clamping bracket 12 and the clamping angle 13 step, directly contacting the stainless steel plate; the wide (chassis) transformer is clamped at the upper layer of the step, placed on the adjustable U-shaped clamping bracket 12 and the clamping angle 13; the sliding positioning baffle slides to the corresponding stop line, and if its edge can coincide with it, the positioning is accurate; otherwise, the transformer is re-hoisted and adjusted until the edge of the positioning baffle completely coincides with the stop line, ensuring that the positioning reference point (X 0 , Y 0 , Z 0 ) is accurate relative to the spatial coordinates of the tooling pallet.

[0036] When the transformer positioning tool 1 approaches the workstation through the tool transmission device, it touches the tool guide plate 32, adjusts its travel direction angle, and slowly slides along the edge of the tool transmission device 31 to the predetermined workstation, gradually moving toward the reference coordinate point (X 定 , Y 定 , Z 定 ) of Y 定 Coordinate adjustment, terminal positioning Y coordinate adjusted to Y 0+△Y, where △Y is the adjustment distance of the guide plate, and finally Y 0 +△Y = Y 定 ;

[0037] After the transformer positioning tooling 1 enters the predetermined working position along the tooling guide plate 32, the tooling position sensor 6 is triggered. The PLC controller shuts down the drive motor of the tooling transmission device 31, and at the same time starts the tooling stop mechanism 33 to lift it. The inertial movement causes the transformer positioning tooling 1 to touch the tooling stop mechanism 33 and move in the reverse direction. The PLC controller then starts the roller drive motor to move the transformer positioning tooling 1 forward to the in-place position. The X coordinate of the terminal positioning of the transformer 4 to be measured is adjusted to X 0 +X 1 , X 1 is the travel of the transformer positioning tooling 1 in the transmission device, and finally X 0 +X 1 = X 定 ;

[0038] The transformer crimping and positioning device 2 takes the geometric center of the crimping copper bar 26 as the reference point, and takes the spatial position of the reference point after the crimping cylinder 21 presses down and moves as the positioning coordinate origin (X 定 , Y 定 , Z 定 ). Then the initial working state reference point positioning coordinate point of the crimping device for crimping the copper bar is (X 定 , Y 定 , Z 定 +Z 1 ), Z 1 is the stroke of the crimping cylinder; the crimping cylinder 21 and the cylinder positioning bracket form fixed X 定 , Y 定 coordinates, and the reciprocating up and down movement of the crimping cylinder 21 forms the change amount Z of the Z coordinate 1 , and is related to the compression length of the compressed spring; the crimping cylinder 21 of the transformer crimping and positioning device 2 moves vertically downward to the specified stroke, and the crimping copper bar 26 is compressed to the end of the cylinder stroke through the crimping spring assembly 25. The Z coordinate of the crimping copper bar 26 becomes Z 定 +Z 1 -Z 1 = Z 定 , and the cylinder stroke and the elastic variable of the compression spring ensure that Z 定 = Z 0 ; Finally, through the transformer positioning tooling 1 and the tooling movement control device 3, the initial spatial position (X 0 +X 1 Y 0 +△Y, Z 0 ) of the terminals of the transformer 4 to be measured is the same as the copper bar positioning origin (X 定 , Y 定 , Z定 ) overlap, thus achieving the accurate alignment / positioning and crimping of the transformer crimping and positioning device 2 with the terminal of the transformer to be measured.

[0039] The transformer crimping and positioning device 2 positions X 定 The coordinate has the same or equivalent predetermined position parameters as the tooling stop mechanism 33. After the transformer positioning tooling 1 touches the tooling stop mechanism 33, X 0 +X 1 = X 定 ; The mid-vertical plane in the Y-axis direction of the crimping copper bar 26 theoretically coincides with the mid-vertical plane in the Y-axis direction of the terminal of the transformer to be measured, and the crimping copper bar 26 of the transformer crimping and positioning device 2 completes the alignment in the X direction with the terminal of the transformer to be measured.

[0040] The length direction of the crimping copper bar 26 coincides with the Y-axis, so that the X coordinates of the terminals of the transformers 4 at different positions in the Y-axis direction intersect with it, realizing the crimping of the transformer crimping and positioning device 2 to various transformers 4; on the other hand, the width direction of the crimping copper bar 26 coincides with the X-axis, and the width dimension and tolerance of the transformer 4 terminal are included within the width dimension range of the crimping copper bar 26, eliminating the influence of the process error of the transformer 4 terminal on the positioning accuracy.

[0041] In the method of the present invention, the positioning accuracy of the terminal center point: the tolerance range is ±10 mm in the X direction, +70 mm in the Y direction, and +5 mm in the Z direction; the crimping success rate is 100%; the vertical pressure of the electrical contact is 100 kg, and the contact resistance

[0042] <0.06 μΩ, and the temperature rise <20 °C.

[0043] The present invention combines the moving positioning of the above-mentioned transformer positioning tooling, the moving of the transformer crimping and positioning device through the crimping cylinder and the redundant positioning of the crimping copper bar, the limiting of the tooling stop mechanism, and the position control of the tooling guiding mechanism. Finally, the spatial coincidence of the terminal of the transformer to be measured and the electrical contact of the crimping device is achieved, realizing the purpose of positioning and crimping the terminal of the transformer to be measured. Abandoning the complex equipment such as traditional servo motors and robot vision positioning, the high-cost and low-efficiency positioning methods, and adopting workpiece movement and mechanical control, the positioning equipment is simple and the cost is low.

[0044] The above is only the preferred embodiment of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the technical principle of the present invention, several improvements and deformations can be made, and these improvements and deformations should also be regarded as the protection scope of the present invention.

Claims

1. A positioning method for a current transformer test electrical connection automatic positioning device. It is characterized in that The current transformer test electrical connection automatic positioning complete set includes: a transformer positioning tool, a tool movement control device and a transformer crimping positioning device; the transformer positioning tool is transported to a predetermined work position by the tool movement control device, the transformer crimping positioning device is arranged above the tool movement control device, the transformer positioning tool is used to limit the chassis position of the transformer to be tested, the tool movement control device is used to move the positioning tool and adjust its movement position, and the transformer crimping positioning device is used to align the transformer terminals to be tested and crimp the electrical contacts; The transformer positioning tooling structure includes: a tooling tray, an adjustable U-shaped bracket and a pair of clamping angles; the adjustable U-shaped bracket and the pair of clamping angles are arranged on the surface of the tooling tray, and the adjustable U-shaped bracket structure includes: two parallel step-shaped profiles and a sliding positioning baffle, the sliding positioning baffle can slide along the fixed slide groove in the tray to adjust the length of the limit space of the chassis of the transformer to be tested to meet the limit of series transformers of different lengths and models; the adjustable U-shaped bracket and the clamping angle are both step-shaped metal components, which can adapt to the limit of series transformers of two different widths and models; The tooling movement control device includes: a tooling transmission device, a tooling position sensor, a tooling guide plate and a tooling stop mechanism; the tooling transmission device is a roller conveyor, which is composed of a plurality of belt conveyor sections; the tooling position sensor is arranged above a predetermined station of the tooling transmission device, and when the mutual inductor positions the tooling in place, it controls the braking of the tooling transmission device motor and the start-up of the tooling stop mechanism; the tooling guide plate is arranged at the front end of the predetermined station of the tooling transmission device, and the horizontal angle of the tooling guide plate is 7°, and the chamfered arc surface of the tooling tray and the cross-section of the tooling guide plate slide together to form a reverse force, so that the positioning tooling approaches the specified positioning direction; the tooling The stop mechanism is arranged at the end of the predetermined workstation of the tooling transmission device, and cooperates with the tooling position sensor to block the movement of the transformer positioning tooling, and forms a positioning constraint on the direction of travel of the transformer positioning tooling. The transformer crimping positioning device comprises: a crimping cylinder and a connecting plate, an insulating plate, an electrical pressing plate, a spring assembly and a crimping copper bar; the upper side of the connecting plate is connected to the crimping cylinder, the lower side of the connecting plate is connected to the insulating plate, and the lower side of the insulating plate is symmetrically connected to two electrical pressing plates, each of which is connected to the crimping copper bar through a spring assembly to form a crimping electrical contact of a pair of terminals of the transformer; the spring assembly comprises: a spring and a bolt, and the spring is sleeved on the bolt; The following steps are involved: The current transformer to be tested is lifted into the current transformer positioning tooling. The narrow current transformer can be clamped at the bottom layer of the adjustable U-shaped holder and the clamping corner step, and directly contact the stainless steel metal plate; the wide current transformer can be clamped at the upper layer of the step and placed on the steps of the adjustable U-shaped holder and the clamping corner; the sliding positioning bar slides to the corresponding stop line. If its edge can completely coincide with the stop line, the positioning is accurate; otherwise, the current transformer is lifted again for adjustment until the edge of the positioning bar completely coincides with the stop line, ensuring that the positioning reference point (X 0 , Y 0 , Z 0 ) of the primary terminal of the current transformer is accurately positioned relative to the space coordinate of the tooling tray; When the mutual inductor positioning tooling approaches the working station through the tooling transmission device, it touches the tooling guide plate, adjusts the angle of its traveling direction, slowly slides along the edge of the tooling transmission device towards the predetermined working station, and gradually moves towards the positioning reference coordinate point (X 定 , Y 定 , Z 定 ) of the Y 定 coordinate for adjustment. The Y coordinate of the terminal positioning is adjusted to Y 0 + △Y, where △Y is the adjustment distance of the guide plate. Finally, Y 0 + △Y = Y 定 ; After the mutual inductor positioning tooling enters the predetermined working station along the tooling guide plate, it triggers the tooling position sensor. The PLC controls the drive motor of the tooling transmission device to stop, and at the same time starts the tooling stop mechanism to lift it. The movement inertia causes the mutual inductor positioning tooling to touch the stop mechanism and move in the reverse direction. The PLC controller then starts the roller drive motor to move the positioning tooling forward to the in-place position, and the X coordinate of the terminal of the mutual inductor to be measured is adjusted to X 0 +X 1 , X 1 is the travel of the tooling in the transmission device, and finally X 0 +X 1 = X 定 ; The crimping and positioning device of the mutual inductor takes the geometric center of the crimped copper bar as the reference point, and takes the spatial position of the reference point after the downward movement of the crimping cylinder as the origin of the positioning coordinates (X 定 , Y 定 , Z 定 ). Then the positioning coordinate point of the reference point in the initial tooling state of the crimping device is (X 定 , Y 定 , Z 定 + Z 1 ). Z 1 is the stroke of the crimping cylinder; the cylinder and the external mounting bracket form fixed X 定 , Y 定 coordinates, and the reciprocating up and down movement of the cylinder forms the change amount Z 1 of the Z coordinate, which is related to the compression length of the compressed spring; the crimping cylinder of the mutual inductor crimping and positioning device moves vertically downward to the specified stroke, and the crimped copper bar is compressed to the end of the cylinder stroke through the spring mechanism, and the Z coordinate of the crimped copper bar becomes Z 定 + Z 1 - Z 1 = Z 定 . The cylinder stroke and the elastic variable of the compression spring ensure that Z 定 = Z 0 ; finally, through the mutual inductor positioning tooling and the tooling movement control device, the initial spatial position (X 0 + X 1 , Y 0 + △Y, Z 0 ) of the terminal of the mutual inductor to be measured coincides with the copper bar positioning origin (X 定 , Y 定 , Z 定 ) of the crimping device, thus realizing the accurate alignment / positioning and crimping of the crimping device and the terminal of the mutual inductor to be measured; The positioning X of the mutual inductor crimping device 定 The coordinate has the same or equivalent predetermined position parameter as the stop mechanism. After the positioning tooling touches the stop device, X 0 +X 1 =X 定 ; The middle vertical plane in the Y-axis direction of the crimped copper bar coincides with the middle vertical plane in the Y-axis direction of the terminal of the mutual inductor to be measured in theory. The crimped copper bar of the mutual inductor crimping and positioning device and the terminal of the mutual inductor to be measured complete the alignment in the X direction. The length direction of the crimped copper bar coincides with the Y-axis, so that the X-coordinates of the transformer terminals at different positions in the Y-axis direction intersect with it, thereby realizing the crimping of various transformers by the transformer crimping positioning device; on the other hand, the width direction of the crimped copper bar coincides with the X-axis, and the width dimension and tolerance of the transformer terminal are included in the width dimension range of the crimped copper bar, thereby eliminating the influence of the process error of the transformer terminal on the positioning accuracy.

2. The positioning method according to claim 1, It is characterized in that The tooling tray is a rectangular hollow clamping plate. The hollow of the clamping plate is used to position the insertion of the forklift fork during tooling handling. The four corners of the tooling tray are designed with a chamfer of 25 mm radius. The tooling tray is made of a wood insulating material with a friction coefficient greater than 0.8 to ensure the moving friction force between it and the transmission device.

3. According to the positioning method described in claim 1, characterized in that the upper surface of the tooling tray is covered with a stainless steel metal plate, which also serves as a test grounding plate and can form a conductor connection with the metal base of the transformer to be used as the ground electrode for transformer testing.

4. According to the positioning method described in claim 1, characterized in that the tooling tray is provided with a chute for the sliding track of the sliding positioning bar. The tooling tray is engraved with the transformer positioning direction mark and the stop line of the sliding positioning bar to ensure the correct placement direction and accurate positioning of the transformer. The sliding positioning bar is provided with a rotatable bolt. When the edge of the bar coincides with the stop line, the bolt is tightened to prevent the limited transformer from sliding.

5. According to the positioning method described in claim 1, characterized in that the bottom surface of the crimping copper bar is covered with a copper braided soft pad to meet the requirements of flexible electrical connection and increase the electrical contact surface, reduce the contact resistance, avoid heating, and the two sides of the soft pad are pressed tightly with soft pad pressing strips and fixed with screws.

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