CN113523090B

CN113523090B - Stripping and punching device for framework coil

Info

Publication number: CN113523090B
Application number: CN202110691609.8A
Authority: CN
Inventors: 宋佳文; 宋国新; 杨传涛; 丁玉东; 张卫
Original assignee: Zhejiang Chant New Materials Technology Co ltd
Current assignee: Zhejiang Chant New Materials Technology Co ltd
Priority date: 2021-06-22
Filing date: 2021-06-22
Publication date: 2023-02-24
Anticipated expiration: 2041-06-22
Also published as: CN113523090A

Abstract

The invention discloses a die stripping and punching device for a framework coil. The die withdrawing module comprises a die withdrawing guide post and a die withdrawing pressing block, the die withdrawing guide post is used for placing a framework coil to be withdrawn, the die withdrawing pressing block is vertically matched with the die withdrawing guide post, and the die withdrawing pressing block is driven by the driving module to press down so as to withdraw the framework coil from the die. The punching module comprises a punching guide post and a punching needle, the punching guide post is connected to the lower end of the demoulding guide post, is of a hollow structure and comprises a plurality of through holes corresponding to positions to be punched on the framework coil, the framework coil is attached to the inner surface of the punching guide post after demoulding, and the punching needle is arranged corresponding to the through holes and reciprocates along the through holes under the driving of the driving module.

Description

Stripping and punching device for framework coil

Technical Field

The invention relates to the technical field of voice coils, in particular to a stripping and punching device for a framework coil.

Background

The voice coil is an important component of a mechanical wave system of an electrodynamic loudspeaker and is a coil for passing current in the loudspeaker. The performance of the voice coil affects the sound intensity characteristics, sound intensity level, impedance curve, distortion, transient characteristics, speaker parameters, tone quality, etc. of the speaker, particularly with respect to the power rating and life of the speaker. According to the structure, the voice coil can be divided into a skeleton voice coil and a frameless voice coil, wherein the skeleton voice coil or the skeleton coil is widely applied.

The framework voice coil consists of a framework, an enameled wire, reinforcing paper and a silk thread. The voice coil is characterized in that the framework is a framework of the whole voice coil, the framework transmits a voice source driving force generated by the voice coil to the outside to form mechanical wave radiation diffusion, and therefore the voice coil framework is required to be light and high in rigidity, and the inner surface of the framework is required to be flat and smooth. In addition, since the voice coil is the main heat source in the speaker, its thermal energy rises as the speaker power rises, and burns out once the endurance limit is exceeded. Therefore, the voice coil is also required to have good high temperature resistance and heat dissipation. And the punching framework can lead hot air generated in the motion process of the voice coil to flow in the voice cavity, thereby reducing the temperature of the voice coil.

The production of the punched voice coil comprises the following main processes: firstly, sleeving a framework, then winding, adhering reinforcing paper, welding a nylon wire, finally demoulding, punching and carrying out inspection and test. At present, in the production of a punching voice coil, the die stripping and punching operation is usually set to two independent positions, manual operation is mostly adopted, the product quality is difficult to ensure on one hand, and the required operation time is long on the other hand.

Disclosure of Invention

Aiming at the problems in the prior art, the invention provides a die stripping and punching device of a framework coil, which can integrate the die stripping and punching operations into the same device to be completed, and the die stripping and punching device comprises:

a demolding module comprising:

the demolding guide column is used for placing a framework coil to be demolded; and

the die withdrawing pressing block is vertically matched with the die withdrawing guide column and can withdraw the framework coil from the die when pressed downwards; and

a punching module comprising:

the punching guide post is connected to the lower end of the die stripping guide post, the punching guide post is of a hollow structure and comprises a plurality of through holes corresponding to positions to be punched on the framework coil, and the framework coil is attached to the inner surface of the punching guide post after being stripped; and the punching needle is arranged corresponding to the through hole and is used for completing punching on the framework coil through the through hole.

Further, the stripping press block is driven by hydraulic pressure.

Further, the punch pin is driven by hydraulic pressure.

Further, the demolding module further comprises:

the first cross beam is fixedly connected with the demoulding pressing block and is used for driving the demoulding pressing block to press downwards;

one end of the lower pressure rod is connected to the first cross beam, and the other end of the lower pressure rod is connected with the hydraulic driving module; and

a second cross member connected to the first cross member, the down-pressure rod penetrating the second cross member to be connected to the hydraulic drive module.

Furthermore, the demolding and punching device further comprises a sensing unit for detecting whether an obstacle exists in an operation area during punching and demolding operation.

Furthermore, the demolding and punching device further comprises a lead wire limiting unit which is sleeved on the demolding guide post and is configured to enter the punching guide post along with the framework coil when the demolding pressing block is pressed downwards.

Further, the demolding and punching device further comprises a positioning unit used for positioning the framework coil.

Further, the demolding and punching device further comprises a cleaning unit, and the cleaning unit comprises:

a gas pipe in communication with the stripping press block and configured to blow gas while the stripping press block is pressed down; and

and the controller is used for controlling the hydraulic module to start so as to blow the air pipe.

Further, the cleaning unit is configured to perform cleaning once per a specified number of punching times.

Further, the demolding and punching device further comprises an early warning unit, and the early warning unit comprises:

the punching needle length detection module is used for detecting the length of the punching needle;

the air pressure detection module is used for detecting the air pressure of the hydraulic module; and

and the controller is communicably connected with the punching needle length detection module and the air pressure detection module, and alarms if the punching needle length is lower than a preset value and/or the air pressure is lower than the preset value.

According to the die stripping and punching device for the framework coil, the die stripping and punching processes are combined into the same device to be completed, and after the framework coil to be subjected to die stripping and punching is placed at the designated position manually, the subsequent operation can be automatically completed, so that the operation is simple, the operation efficiency is improved, and the product yield is improved. In addition, the arrangement of the sensing unit guarantees the personal safety of operators. The arrangement of the lead wire limiting unit effectively ensures that the lead wire cannot enter a punching range of the punching needle when punching, and the lead wire and the pad copper foil can be prevented from being broken by matching with the positioning unit. The cleaning unit can regularly clean residual paper scraps generated by punching, and the cleanliness of the station is ensured. The improved components act together to form a safe, efficient and accurate integral process, and have definite technical effects.

Drawings

To further clarify the above and other advantages and features of embodiments of the present invention, a more particular description of embodiments of the present invention will be rendered by reference to the appended drawings. It is appreciated that these drawings depict only typical embodiments of the invention and are therefore not to be considered limiting of its scope. In the drawings, the same or corresponding parts will be denoted by the same or similar reference numerals for clarity.

Fig. 1 is a schematic structural diagram of a framework coil stripping and punching device according to an embodiment of the present invention.

Detailed Description

In the following description, the present invention is described with reference to examples. One skilled in the relevant art will recognize, however, that the embodiments may be practiced without one or more of the specific details, or with other alternative and/or additional methods, materials, or components. In other instances, well-known structures, materials, or operations are not shown or described in detail to avoid obscuring aspects of the invention. Similarly, for purposes of explanation, specific numbers, materials and configurations are set forth in order to provide a thorough understanding of the embodiments of the invention. However, the invention is not limited to these specific details. Further, it should be understood that the embodiments shown in the figures are illustrative representations and are not necessarily drawn to scale.

Reference in the specification to "one embodiment" or "the embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment of the invention. The appearances of the phrase "in one embodiment" in various places in the specification are not necessarily all referring to the same embodiment.

It should be noted that the embodiment of the present invention describes the process steps in a specific order, however, this is only for illustrating the specific embodiment and is not meant to limit the sequence of the steps. Rather, in various embodiments of the invention, the order of the steps may be adjusted according to process adjustments.

The present invention is based on the following insight of the inventors: in the production of the existing bobbin coil (also called bobbin voice coil), because the two processes of stripping and punching are generally regarded as little related to each other at present, the two processes are performed separately at present, and two independent posts are usually required to be arranged, each post requires an operator, which requires more space and manpower resources. Meanwhile, the existing mold stripping operation is mostly operated manually by an operator. The force and consistency in the manual die stripping operation process are unstable, so that the product is easy to deform, the roundness size is seriously influenced, and the product performance is poor. Meanwhile, the product is blocked in the manual mold stripping process, an operator is difficult to strip the product, the mold stripping speed is further influenced, the operator is extremely easy to hurt, and the working efficiency is further reduced. In addition, although the punching operation is realized by a machine at present, the existing punching equipment has the following problems:

1. the safety control device is lacked, so that potential safety hazards exist, and the risk of injury to operators exists;

2. the residual paper scraps after punching do not have a fixed recovery device, and the post is messy;

3. the punching position is not accurate, the copper foil on the bonding pad is easy to punch, and the product is seriously scrapped; and

4. the lead wire is easy to break, and the product is scrapped.

The inventor finds the common point of the two procedures through research: firstly, in the production process of the framework coil, the die stripping and the punching are two adjacent procedures; secondly, punching is an operation directly performed on the skeleton coil after the demolding is completed, additional operations such as cooling, transferring and the like are not needed in the middle, and a conveying mechanism can be shared (such as a pushing device is shared to realize demolding and punching at the same time), so that if the punching is combined, the process is greatly simplified. However, through research, the inventor of the present invention has found that if the demolding and punching stations are considered to be combined together, that is, a punching device is disposed on the demolding station, and then an operator places the bobbin coil on the punching device to perform a punching operation after completing the demolding operation, such a process is not substantially improved in terms of efficiency and yield although the need for personnel and space can be reduced. The inventor finds that the main reason of low yield of the existing punching operation in the combined process is that a corresponding auxiliary mechanism is lacked, and the part to be punched is accurately positioned. Because the relative positions of the silk thread, the bonding pad and the part to be punched of the skeleton coil obtained in the previous process are standardized, namely the relative positions are basically fixed, in practice, the accuracy of the position to be punched can be ensured as long as the placing position and the angle of the skeleton coil are correct during punching operation, and therefore, the key for improving the punching yield is to ensure that the skeleton coil to be punched is placed at the correct position and angle. For the problems of yield and efficiency of the demolding operation, a machine can be considered to replace the manual work, and further, the stable control of the pressure during the demolding and pressing can be realized. In addition, after the die stripping is finished, the punching operation can be performed without performing other operations on the framework coil, so that the die stripping and punching equipment can be integrated, the operation steps are further reduced, and the production efficiency is improved. In short, the invention not only simplifies the process by combining the working procedures, but also greatly improves the process precision by improving the positioning precision of the components.

Based on the above insights and researches, the invention provides a framework coil stripping and punching device, and the scheme of the invention is further described below by combining the drawings of the embodiment.

Fig. 1 shows a schematic structural diagram of a stripping and punching device for a bobbin coil according to an embodiment of the present invention. As shown in fig. 1, the die stripping and punching device for the bobbin coil integrates the die stripping and punching operations into a same device, and comprises a die stripping module and a punching module. The die stripping module is arranged above the punching module, so that the stripped framework coil can just enter the designated position of the punching module.

The demolding module comprises a demolding guide column 101 and a demolding pressing block 102. The die withdrawing guide post 101 is used for placing a framework coil to be withdrawn, and during operation, the framework coil to be withdrawn is sleeved on the die withdrawing guide post 101, so that the outer diameter of the die withdrawing guide post 101 needs to be set to be slightly smaller than the inner diameter of the framework coil to be withdrawn, but the outer diameter of the die withdrawing guide post 101 cannot be too small, the framework coil to be withdrawn is difficult to fix due to the fact that the outer diameter of the framework coil is too small, and further subsequent punching operation positioning is inaccurate; the position of the stripping pressing block 102 corresponds to that of the stripping guide post 101 in the vertical direction, and in order to ensure that the framework coil can be stripped from the mold when the stripping pressing block is pressed down, the stripping pressing block 102 is of a hollow structure, and the inner diameter of the tail end of the stripping pressing block is slightly larger than the outer diameter of the stripping guide post 101 but smaller than the inner diameter of the framework coil to be stripped. In the present invention, the term "slightly smaller" or "slightly larger" means smaller or larger than by 10% or less of each other, for example, 1%, 5%, 6%, 7%, 8%, 10%, and the like. In the present invention, the term "anastomosis" means positional correspondence.

In order to ensure that the stripping press block 102 can be vertically pressed downwards, the framework coil to be stripped is uniformly stressed without losing the roundness, and the pressing distance of the stripping press block 102 is better controlled. In one embodiment of the present invention, the demolding module further comprises:

in order to ensure stability, in an embodiment of the present invention, a first support bar 1032 is disposed on the bottom plate, the first support bar 1032 is slidably connected to a first sleeve 1033 at the bottom of the first cross beam 103, and the first cross beam 103 is sleeved outside the first support bar 1032, so that the first cross beam 103 can move up and down along the first support bar 1032 under external force driving. In order to avoid the too large pressing depth of the demolding press block 102, in another embodiment of the present invention, a limiting device is further disposed on the bottom plate, and after the first beam 103 is pressed down to a certain distance, the first beam is blocked by the limiting device and cannot be pressed down further, the limiting device may be, for example, a bolt screwed to an upper bracket of a base, or a limiting block sleeved at the bottom of the first support rod 1032, and for example, the bolt may be screwed to adjust the height of the limiting device to meet the needs of different bobbin coils; and

the first beam 103 is connected to a driving module through a down-pressure rod 104, in one embodiment of the present invention, the driving module is a hydraulic driving unit, and the output pressure of the hydraulic driving unit is adjustable. In an embodiment of the present invention, in order to further ensure the uniformity of the stress, a second beam 105 is further disposed above the first beam 103, the second beam 105 is disposed parallel to the first beam 103, two ends of the bottom of the second beam 105 are respectively connected to the first beam 103 through second springs 1051, and the spring parameters, such as length and spring constant, of the two sides are the same, so as to ensure that the two ends of the second beam are stressed uniformly, and thus the two ends of the second beam are always kept horizontal. Meanwhile, the lower pressing rod 104 is connected to the bottom center position of the second beam 105, and the bottom of the second beam is connected to the driving module. In order to ensure stability, in an embodiment of the present invention, a second support rod 1052 is disposed at the bottom of the second beam 105, and a through hole is disposed at a position of the first beam 103 corresponding to the second support rod 1052, such that the second support rod 1052 can slidably connect with the first sleeve 1033 through the through hole, and the second spring 1051 is sleeved outside the second support rod 1052, and the second beam 103 can move up and down along the first support rod 1032 under the driving of an external force.

The punching module comprises a punching guide column 201 and a punching needle 202. The punching guide post 201 is sleeved at the lower end of the demolding guide post 101, the punching guide post 201 can be of a hollow structure, a plurality of through holes adaptive to the size of a punching needle are formed in the wall of the punching guide post, and the framework coil is attached to the inner surface of the punching guide post after demolding. This can be achieved, for example, by: the inner diameter of the punching guide post is set to be slightly larger than or substantially equal to the size of the bobbin coil, so that the bobbin coil can be stably fixed on the inner surface of the guide post by an elastic force. The punching needle 202 is arranged corresponding to the through hole and can reciprocate along the through hole under the driving of external force, so that the punching operation is completed on the framework coil through the through hole. In one embodiment of the invention, the punching needle is driven by a hydraulic driving unit, and because the die stripping and the punching are not performed synchronously, the punching needle and the die stripping press block can adopt the same hydraulic driving unit, and the hydraulic driving unit is controlled by a control center to sequentially output specified pressure according to an operation time sequence according to the pressure required by the die stripping and the punching.

In order to ensure that the die stripping and punching device does not have an obstacle in the operation area during the operation process or both hands of an operator timely withdraw from the operation area after placing a coil of a framework to be stripped, in one embodiment of the invention, the die stripping and punching device further comprises a sensing unit 301 which can be connected with the driving module in a communication manner, and when the existence of a hand or other obstacles in the operation area during the punching and stripping operation is detected, the driving module is informed to stop working and an alarm is given. Sensing unit for example can be infrared light curtain, infrared light curtain include a plurality of infrared detector, set up in the both sides of module of punching a hole, during the start, can form infrared light curtain, in case someone hand or other article appear in the light curtain, then send out the police dispatch newspaper, and control drive module stop work. The sensing unit can also be a proximity sensor, for example, and is arranged on the demolding guide column and/or the punching guide column, and once an obstacle such as a hand is detected to approach the demolding guide column and/or the punching guide column, the driving module is informed to stop working, and an alarm is given. It should be understood that in other embodiments of the present invention, the sensing unit may also adopt other types of sensors, such as a distance sensor, etc., and the arrangement position thereof may be determined according to the need, and is not limited to the foregoing arrangement manner.

In order to ensure that the copper foil and/or the lead wire of the bonding pad are not damaged in the punching operation, in one embodiment of the invention, the demolding punching device further comprises a positioning unit for positioning the framework coil. The positioning unit can perform positioning on the premise that the center line thereof is marked on the bobbin coil to be demoulded in the preceding operation. Based on this, the positioning unit can include, for example, an infrared emission unit, which is arranged on one side of the demolding guide post, so that infrared light emitted by the infrared emission unit points to a center line of the framework coil to be demolded when the framework coil to be demolded is correctly placed, and when an operator places the framework coil to be demolded, the infrared light is aligned with the center line of the framework coil. The positioning unit may further include a marking line disposed on the demolding guide post and/or the punching guide post, for example, and when an operator places a bobbin coil to be demolded, the operator aligns a center line of the bobbin coil with the marking line. It should be understood that in other embodiments of the present invention, the positioning unit is not limited to the foregoing two positioning manners, and may also include other manners, such as a scale.

Because the lead wire line of skeleton coil is longer, probably be drawn into in the guide post that punches a hole when the drawing of patterns operation, even fall into and punch the needle punching a hole within range, and then lead to being broken by the punching when punching a hole the operation. In order to avoid the situation, in an embodiment of the invention, a nylon yarn line limiting unit is further sleeved outside the demolding guide column, the nylon yarn line limiting unit comprises a film, a through hole is formed in the middle of the film, the edge of the through hole is in a toothed shape, the diameter of the through hole is smaller than the inner diameter of the punching guide column but slightly larger than the outer diameter of the demolding guide column, so that the nylon yarn line can enter the punching guide column along with the framework coil when the demolding press block is pressed downwards, and the nylon yarn line can be erected along the direction opposite to the pressing direction of the framework coil due to the toothed arrangement of the through hole, so that the whole nylon yarn line is prevented from falling into the punching guide column.

During the punching operation, the punched paper scraps may remain inside the punching guide post, and when the paper scraps are too much, the punching guide post may be blocked, and thus the punching operation may fail or even the device may malfunction. To avoid this, in an embodiment of the present invention, the demolding punching device further includes a cleaning unit for periodically cleaning paper scraps left after punching, the cleaning unit includes an air pipe, which is communicated with the demolding press block and is driven by the cleaning driving module, and specifically, the air pipe is driven by the cleaning driving module to blow air while the demolding press block is pressed down. The cleaning driving module is started at regular time, in an embodiment of the present invention, the cleaning driving module is started according to the punching times, specifically, the driving module is started once after the punching operation is completed for a specified number of times, so the cleaning unit further includes a counter for counting the punching times, and the specified number of times is set as required.

In an embodiment of the invention, the demolding and punching device further comprises an early warning unit which can be used for detecting the abrasion degree of the punching needle and/or the output pressure of the driving module and the like, and alarming when the length of the punching needle is lower than a threshold value and/or the output pressure of the driving module is higher than or lower than a preset value.

Based on the die stripping and punching device in one embodiment of the invention, the die stripping and punching operation comprises the following specific steps:

firstly, an operator holds a framework wire to be demoulded in a sleeving manner and is connected to a demould guide post in a demoulding manner, and the center line of the framework wire is aligned with a positioning unit;

and then, starting a device, and starting automatic operation of the die stripping and punching device to complete die stripping and punching:

firstly, the sensing unit detects whether a human hand or other obstacles exist in an operation area, if not, the subsequent operation is carried out, if so, the subsequent operation is carried out after the obstacles are cleared, and meanwhile, the sensing unit always operates in the whole die stripping and punching operation process;

next, the driving module drives the pressing rod to press downwards, so as to drive the demolding press block to press downwards to enable the framework coil to be demolded from the die, the framework coil after demolding enters the punching guide column, and meanwhile, the first beam and the second beam ensure that the demolding press block can be vertically pressed downwards;

next, the driving module drives the punching needle to complete punching on the framework coil, the die withdrawing pressing block keeps a pressing state during punching operation, and the cleaning driving module is started after the punching times are appointed to blow out paper scraps in the punching guide column; and

finally, the driving module stops driving, the lower pressure rod rises back, and meanwhile the sensing unit is closed;

and

and finally, taking down the punched framework coil, and performing the die stripping and punching operation of the next framework coil.

Through tests, compared with the original manual post-demolding machine punching operation, the demolding punching operation performed by the demolding punching device has the advantages that the daily productivity and the product yield are improved, and the daily productivity and the yield of the two schemes are compared as shown in tables 1 and 2 respectively.

Single machine daily production capacity	day1	day2	day3	day4	day5	day6	day7
								Machine punching after manual die stripping	6320	6280	6450	6390	6430	6550	6590
Die stripping and punching device	8560	8850	8850	8630	9520	9170	9560

TABLE 1

TABLE 2

While various embodiments of the present invention have been described above, it should be understood that they have been presented by way of example only, and not limitation. It will be apparent to persons skilled in the relevant art that various combinations, modifications, and changes can be made thereto without departing from the spirit and scope of the invention. Thus, the breadth and scope of the present invention disclosed herein should not be limited by any of the above-described exemplary embodiments, but should be defined only in accordance with the following claims and their equivalents.

Claims

1. The utility model provides a drawing of patterns punching device of skeleton coil which characterized in that includes:

a demolding module comprising:

the demolding guide column is configured to be capable of placing a framework coil to be demolded; and

a die stripping press block corresponding to the die stripping guide column in position in the vertical direction, the die stripping press block being configured to be capable of being pressed downward by a driving module so that the bobbin coil can be stripped from the die; and

a punching module comprising:

the punching guide post is connected to the lower end of the demolding guide post, is of a hollow structure with an inner surface and comprises a plurality of through holes, the size of each through hole is matched with that of the punching needle, and the punching guide post is configured to enable the framework coil to be attached to the inner surface of the punching guide post after demolding; and

and the punching needle is configured to reciprocate along the through hole under the driving of the driving module.

2. The stripper punch apparatus of claim 1, wherein the drive module includes a hydraulic drive.

3. The stripper punch apparatus of claim 1, further comprising:

the top of the first cross beam is connected with a lower pressing rod, the lower pressing rod is configured to be capable of driving the first cross beam to move up and down relative to the demolding guide post under the driving of a driving module, the demolding pressing block is fixedly connected to the center of the bottom of the first cross beam, two ends of the bottom of the first cross beam are respectively connected to a bottom plate of the demolding punching device through first springs, and the first springs at the two ends are consistent in parameter; and

and the second cross beam is arranged in parallel with the first cross beam, two ends of the bottom of the second cross beam are respectively connected to the first cross beam through second springs, and the parameters of the second springs at the two ends are consistent.

4. The stripper punch apparatus of claim 1, further comprising: a sensing unit configured to be able to detect whether there is an obstacle in an operation area at the time of punching and demolding operations.

5. The stripper punch apparatus of claim 4, wherein the sensing unit comprises a plurality of infrared detectors disposed at both sides of the punch module.

6. The stripper punch apparatus of claim 1, further comprising: the lead wire limiting unit is sleeved on the demolding guide post, one side of the lead wire limiting unit, which is in contact with the demolding guide post, is toothed, and the lead wire limiting unit is configured to enter the punching guide post along with the framework coil when the demolding press block is pressed downwards.

7. The stripper punch apparatus of claim 1, further comprising: and the positioning unit comprises an infrared transmitter which is configured to transmit infrared rays capable of pointing to the center line of the skeleton coil.

8. The stripper punch apparatus of claim 1, further comprising: a cleaning unit comprising:

and the air pipe is communicated with the demolding pressing block, is driven by the cleaning driving module, and is configured to blow air by driving of the cleaning driving module while the demolding pressing block is pressed downwards.

9. The stripper punch apparatus of claim 8, wherein the cleaning unit further comprises a counter configured to count a number of punching operations and to notify the cleaning drive module to start after the number of punching operations is specified.

10. The stripper punch apparatus of claim 1, further comprising: the early warning unit includes:

a punch pin length detection module configured to detect a punch pin length;

an air pressure detection module configured to detect an air pressure of the hydraulic module; and

the controller is connected with the punching needle length detection module and the air pressure detection module in a communication mode and is configured to give an alarm when the punching needle length is lower than a preset value and/or the air pressure is lower than or higher than the preset value.