As shown in the figure below, it is a sensor coil used in the medical industry. The skeleton is made of aluminum. The diameter of the enameled wire is 0.1mm. The customer requires the arrangement to be neat and free of winding defects. The company has carefully evaluated the specific requirements of the customer, because the winding process and winding are considered. After the completion of the structure, the self-adhesive enameled wire process was adopted, and the self-adhesive coil winding machine was further optimized. The project was successfully completed. At the same time, some experience was summarized and shared with the public during the process.

      In recent years, due to self-adhesive support, self-adhesive coils do not need to be dipped in the later stage, which is convenient for industrialization. They have been widely used in deflection coils of precision instruments, combined coils in micro motors, and micro coils in sensors.

   Self-adhesive enameled wire has become the main wire type used in the coil winding process due to its excellent heat resistance, insulation, adhesion durability, easy forming, simple winding process and other advantages. After the self-adhesive coil is formed, it is required that the DC resistance of the coil is good, the inductance performance is stable, the wiring is neat and not scattered, the surface is smooth and there is no gap, and the appearance is beautiful.

In addition, the coil needs to maintain a certain shape during use, which requires that the bonding strength of the coil does not decrease over time under different environments. In the winding process, especially for enameled wires below 0.1mm, there are often scattered, overlapping, loose and other phenomena. The factors that affect the winding quality are mainly considered from the enameled wire, winding equipment and tooling:

 1 The influence of enameled wire on winding quality

The surface paint layer of the self-adhesive enameled wire is divided into two parts: a primer layer and a self-adhesive layer. The primer layer functions as an insulating layer and protects the internal copper core. The self-adhesive layer mainly plays the role of bonding and forming. The primer layer is formed mainly by dipping and baking, which is generally baked after two to three dipping. Both the primer and topcoat materials need to be filtered to filter gels and mechanical impurities. The solvent formula is reasonable, so that the wire coating can be cured smoothly without defects such as uneven thickness and bubbles. The uniformity, fluidity, and adhesion of the primer make the final film thickness uneven.

Take ELEKTRISOLA Ф0.06ABP15 self-adhesive wire as an example. The outer diameter is between Φ0.072mm and Φ0.075mm. According to actual experience, during winding, the wire spacing needs to be set higher than the diameter of the enameled wire. Enameled wire with a core material of Φ0.06 mm, and the spacing between the wires should be at least 0.08 mm. According to the bonding method, self-adhesive enameled wires are mainly divided into hot air, heating furnace, and alcohol bonding (soluble in absolute ethanol). Alcohol bonding is to directly bond self-adhesive enameled wires with industrial absolute ethanol (industrial alcohol, ethanol content is higher than 99%) when winding the coil. The limitation is mainly that alcohol has a swelling effect on self-adhesive materials, and there is excessive alcohol volatile concentration. High risk of spontaneous combustion or explosion, hot air or heating furnace method is convenient for mass production and automatic control. Therefore, the mainstream self-adhesive methods are mainly hot air, heating furnace and other heating methods. For thermal curing methods such as hot air and heating furnaces, the temperature of the heating process, the temperature gradient and the uniformity of the temperature have an important influence on the bonding performance of the winding. The bonding effect of self-adhesive enameled wire is mainly because the curing of self-adhesive paint is a staged polymerization process, at this time, the self-adhesive layer exists in the form of prepolymer. When the self-adhesive enameled wire is being wound, it needs to be heated (usually heated by hot air) to make it secondary polymerization and deep curing, so as to achieve the purpose of firm bonding.

Suzhou REPOSAL Electronic Mechanical Equipment Co., Ltd. is a technology enterprise specializing in R&D and production of winding equipment. For many years, it has insisted on maintaining innovation and researching and developing products with independent intellectual property rights.

　 For quite a long time, my country's winding machine manufacturing industry generally has the problems of low technology, small scale, free and scattered production, and insufficient technological innovation of most enterprises. Compared with related industries abroad, my country currently has fewer types of winding machines and supporting equipment. The control technology used is relatively backward, and its accuracy and performance are not as good as those of their European and American counterparts. Moreover, the product has low production capacity and poor stability.

     In the face of technical gaps, Suzhou REPOSAL made a detailed market research and took the entire series of precision winding machines and Roche coil winding machines as breakthrough points.It valued cooperation with user companies and not only carefully understood the existing process requirements of customers. And through the company's accumulated technical database for many years, on the premise of no or little increase in costs, it actively provides new ideas and new solutions for customer process upgrades.In a specific single implementation case, this approach has undoubtedly aggravated us The execution cost of the company has reduced the company's profits, but this idea has been implemented and verified for a long time.In fact, our customers have tapped the potential of the coil winding process through our winding machine equipment and become our long-term cooperative customers. We have also accumulated more technical data for our research and development direction and solutions through proactive improvement of individual cases, so as to achieve continuous innovation.

      This article introduces the test of designing tension control system to minimize the change of tension. Perform theoretical analysis on simulation. The simulation results show that the tension of the enameled wire is frequently fluctuated due to the length change caused by the speed change. The model's tension sensor verifies the prediction. The key to successful design is to eliminate changes in tension. We added a tension system that includes a high-speed cylinder to replace the traditional wool felt and spring mechanism. The simulation results showed that the new prototype system almost doubled the winding speed and the ability to withstand tension fluctuations.

Keywords: tension control, winding machine, rectangular coil, precision winding machine.

One. introduction

      Countless transformers are produced every year. Together with power plants, substations and power lines, distribution transformers provide electricity for businesses and residential buildings across the country. Transformer manufacturing involves the production of winding coils. These coils are usually made of an insulating paper layer sandwiched between a pair of copper wires. They are usually round or rectangular.

      A consistent tension must be maintained on the coil windings. The shape of the coil has a major influence on the tension applied by the tension. For a circular coil, the tension does not change significantly, but a rectangular coil is different. As a rectangular coil, the tension changes sharply with the position of the drop point. As shown in the figure, this change in speed is caused by the changing length of the line. In the case of a round coil, this is not a problem, because the contact points of the wires on the coil are fixed.

Precision C-shaped coil winding machine

Operation video of belt loop coil winding machine-controller setting

     Now we focus on the use of the controller of the toroidal coil winding machine. The controller is very mature. It is divided into several functional areas. This one is the status area. For example, the indicator light before the standby character is on, which is standby. Status, the red light in front of the standby is on. For example, when we press Start, the running light will turn on, indicating that it is currently running. This is a status area.

      This is a numeric parameter. When we want to set the parameters of the toroidal coil winding machine, for example, the parameters such as the diameter of the outer diameter and the diameter of the enameled wire, there is still a cable angle for the ring-shaped product. From this position to this position slowly, this involves a range. We use the winding angle and the cable angle to control the cable range on the controller interface, after the specified cable angle , He went back to the line, before and after the set winding angle and line angle.

     The other is the speed. The high-speed and low-speed reference on the controller interface of the loop coil winding machine. The high-speed refers to the normal winding speed. The low-speed is the speed at the beginning and the end, and then the number of slow-down laps. Specify a specific number, such as slow speed, you need to specify a lap speed of one lap, two laps and three laps, according to your needs.

       Here is a switch parameter area, such as the direction of the winding, such as the storage ring on this toroidal coil winding machine, we can let him turn clockwise or counterclockwise, and then the direction of the cable, the cable The direction is the process of winding the product. We can also let him turn clockwise or counterclockwise. This is the direction of the cable. Whether to start automatically between different programs, this can also be set.

   REPOSAL  takes the string winding machine as the research object and adopts the modal analysis method. Firstly, the vibration principle and the movement principle of the winding mechanism of the small string winding machine are discussed in theory. Based on the principle analysis, the vibration analysis of the ADAMS model of the small copper wire winding mechanism to study the vibration damping characteristics between the roller shaft and the frame is carried out respectively, and the wire winding mechanism of the string winding machine is made using ANSYS software. Modal analysis was carried out for normal operation. Through analysis, the vibration characteristics of the winding mechanism of the string winding machine under normal working conditions are obtained respectively to optimize the vibration damping measures of the winding mechanism. At the same time, the mechanical characteristics of the thin wire and CNC under the normal working state of the CNC winding mechanism are analyzed. , Optimizing the feasibility of applying the CNC cable winding mechanism to the string winding machine cable winding mechanism.

      Precision Flexible Roche Coil Winding Machine is a special equipment for winding precision flexible Roche coils. With the actual project as the background, Xiepu successfully developed a precision flexible Rogowski coil winding machine by decomposing the flexible Rogowski coil winding process.

     The precision flexible Roche coil winding machine does not belong to the ranks of general numerical control equipment, but a special non-standard equipment. For this type of equipment, it is mainly reflected in a special purpose. Since the special purpose means that the market demand is not large, it is indispensable. For equipment manufacturers, the development of such special equipment is not favored, and cost control is very difficult.

     In addition, the current domestic manufacturers of flexible Roche coils have limited demand for equipment. At the same time, if you want to control the pitch accuracy and alignment, the equipment research and development costs are relatively high, and the market risk is large. At the same time, for equipment users, their corresponding The supporting equipment and instruments are a large investment.

       Below we introduce the structure of this toroidal coil winding machine. This part is the controller and this part is the clamping base. We control the product clamping by opening and closing the handle. This position is the storage ring. The enameled wire is stored on the storage ring first, and then wound around this product. This position is a manual winding handle. Turn this handle. The steel plate can be driven manually. The steel ring has an opening. This position is an opening. The opening is opened and closed by sliding the handle up and sliding to the left. . This position is called the crimping plate, and this position is called the baffle. After the line is removed, its degree of tightness is determined by the tension of the belt. The tension of the belt is adjusted by the tension adjustment knob. When adjusting the tension of the belt, first loosen this And then rotate the handle. When rotating the handle, there is an idler wheel. When the idler wheel goes in, the tension of the belt will increase, so that the winding of the enameled wire will become tighter.

Transformer winding machine:

    Similar to transformers, current transformers also work according to the principle of electromagnetic induction. The transformer transforms voltage and the current transformer transforms current. The current transformer is connected to the winding of the measured current (the number of turns is N1), called the primary winding (or primary winding, primary winding); the winding connected to the measuring instrument (the number of turns is N2) is called the secondary winding (or secondary side) Winding, secondary winding).

    This ring current transformer winding machine is generally used to wind small size current transformers. The characteristics of small size current transformers are generally wire diameter of enameled wire between 0.11-0.19mm, and the number of turns is large.

It requires accurate turns and fast winding speed.

    REPOSAL  this machine is fast and stable, and the speed reaches 1400RPM. Because it is stable, it can realize the operation of multiple ring current transformer winding machines by one person.

Transformer coil winding machine

  Stable, high-speed and safe U-shaped core coil winding machine

The U-shaped coil winding machine is suitable for the winding of the bottom edge of the U-shaped core.Usually, the center of the U-shaped core is difficult to coincide with the rotation axis of the winding machine, resulting in a large vibration of the winding machine. , Affecting efficiency.

This type of winding machine developed by our company does not rotate the U-shaped iron core, only reciprocates, and rotates around the product to reduce vibration and improve efficiency.

      With the optimized clamping method, it only takes 2 seconds to complete the clamping.

      Therefore, the rotating parts of this type of machine have a large diameter and a high speed.There are similar machines on the market, and the larger ones do not have a protective cover. Safety accidents often occur.This machine of the company has a protective cover design.