CN115938704A - A kind of system and process of spraying aluminum edge for piezoresistor sheet - Google Patents

Abstract

The aluminum-spraying and edge-retaining process of the piezoresistive sheet disclosed by the invention comprises an aluminum-spraying device, a rotating positioning device and an edge-grinding device. The aluminum spraying device is used to spray aluminum on the two end faces of the varistor sheet to form electrodes. The rotary positioning device is provided with positioning jaws for clamping the piezoresistor, and is used to drive the piezoresistor after spraying aluminum to rotate. The edge grinding device is used for grinding the edges of the two end faces of the piezoresistor piece held by the rotary positioning device. The aluminum-spraying and edge-spraying system for piezoresistors disclosed in the present invention can realize automatic aluminum-spraying and edge-spraying of piezoresistors, avoiding the work intensity of manual disassembly and assembly of aluminum-spraying jigs, improving production efficiency, and reducing human influence , to ensure the stability of production quality. The aluminum-sprayed and edge-spraying process of the piezoresistor sheet disclosed by the invention includes a step of spraying aluminum on the end surface and an edge grinding step, which can realize automatic production of the aluminum-sprayed edge of the piezoresistor sheet and improve production efficiency.

Description

A kind of system and process of spraying aluminum edge for piezoresistor sheet

technical field

The invention relates to the technical field of piezoresistor production, and more specifically, relates to an aluminum-sprayed edge retaining system and process for piezoresistors.

Background technique

Zinc oxide varistors (hereinafter referred to as resistors) are the core components of metal oxide arresters. The overvoltage level of the power system and the insulation level of equipment directly depend on the performance of the resistors. The electrical performance of the resistor is restricted and affected by many factors, among which the quality of the aluminum-sprayed edge of the resistor can directly affect the electrical performance of the resistor, so the production process of the aluminum-sprayed edge of the resistor is particularly critical.

With the continuous development of the resistor chip manufacturing process, the highly automated, efficient, environmentally friendly, and stable quality resistor chip manufacturing process has become a future development trend, which also puts forward higher requirements for the aluminum side edge spraying process of the resistor chip end. The aluminum-spraying process of the existing resistor chip manufacturing process needs to rely on manual disassembly and assembly of the aluminum-spraying jig to realize the aluminum-spraying treatment of the upper and lower end surfaces of the resistor chip. Specifically, the operator needs to put a rubber sleeve on the resistance piece, and then place it on the conveyor belt of the aluminum spraying machine. After spraying aluminum on the upper end surface of the resistance piece, turn it over 180 degrees, and spray aluminum on the lower end surface of the resistance piece. . The existing process of aluminum-sprayed and edge-retaining resistance sheet is cumbersome in production process, the labor burden of operators is heavy, and the production quality is unstable due to the influence of human factors.

Therefore, how to realize the automatic aluminum spraying of the resistance sheet to reduce the labor intensity of the operators and improve the production efficiency has become a technical problem to be solved urgently by those skilled in the art.

Contents of the invention

In view of this, the object of the present invention is to provide an aluminum-sprayed edge retaining system for piezoresistors, so as to reduce the labor intensity of operators and improve production efficiency.

Another object of the present invention is to provide an aluminum-sprayed and edge-retaining process for the piezoresistor, so as to realize the aluminum-sprayed edge of the piezoresistor.

To achieve the above object, the present invention provides the following technical solutions:

A process for spraying aluminum edges of varistor sheets, comprising:

An aluminum spraying device is used to spray aluminum on the two end faces of the varistor sheet;

The rotary positioning device is provided with positioning jaws for clamping the piezoresistor, and is used to drive the piezoresistor after spraying aluminum to rotate;

The edge grinding device is used for grinding the edges of the two end faces of the piezoresistor sheet held by the rotary positioning device.

Preferably, in the aluminum-sprayed edge retaining system of the above-mentioned varistor sheet, the rotation positioning device includes:

the positioning jaw;

The rotary positioning servo motor is connected with the positioning jaws in transmission, and is used to drive the positioning jaws to clamp the piezoresistor and drive the piezoresistor to rotate.

Preferably, in the above-mentioned sprayed aluminum edging system of the varistor sheet, the edging device includes:

Grinding mechanism, including grinding head for grinding;

The moving module includes a grinding head horizontal moving module for driving the grinding mechanism to move in the horizontal direction, and a grinding head vertical moving module for driving the grinding mechanism to move in the vertical direction, and the grinding head moves horizontally The module is arranged on the vertical movement module of the grinding head, and the grinding mechanism is arranged on the horizontal movement module of the grinding head.

Preferably, in the above-mentioned aluminum-sprayed edge retaining system for piezoresistors, the grinding mechanism includes a quick-change mechanism for quickly switching the grinding head.

Preferably, in the aluminum-sprayed edge retaining system of the piezoresistor, the grinding mechanism is provided with a distance sensor for measuring the thickness of the piezoresistor.

Preferably, in the above-mentioned aluminum-sprayed edge retention system for piezoresistors, a float for controlling the feed rate of the grinding head is provided between the horizontal movement module of the grinding head and the vertical movement module of the grinding head. mechanism.

Preferably, in the above-mentioned aluminum-spraying and retaining system for piezoresistors, it also includes a method for transferring the piezoresistors from the first position sprayed by the aluminum-spraying device to the position where the varistors are sprayed by the rotation positioning device. The loading and unloading device at the second position of clamping, the loading and unloading device includes:

A retrieving claw, the retrieving claw is provided with a retrieving suction cup;

A loading and unloading servo motor, the loading and unloading servo motor is in transmission connection with the retrieving claw, and is used to drive the retrieving claw to move.

A process for spraying aluminum and retaining edges of varistor sheets, comprising the steps of:

The end face is sprayed with aluminum, and the first end face and the second end face of the varistor are sprayed with aluminum to obtain a semi-finished product of the varistor;

edge grinding, grinding the edges of the first end surface and the second end surface of the semi-finished varistor sheet to obtain a finished varistor sheet.

Preferably, in the aluminum spraying edge retaining process of the above-mentioned varistor sheet, the step of spraying aluminum on the end surface and the step of edge grinding further includes the steps:

Grinding and feeding, transferring the semi-finished varistor sheet from the first position for performing the step of spraying aluminum on the end surface to the second position for performing the step of edge grinding;

After the edge grinding step, also include the steps of:

Grinding and blanking, transferring the finished varistor sheet from the second position to a third position for subsequent processes.

Preferably, in the aluminum-sprayed edge-retaining process of the above-mentioned varistor sheet, the edge grinding step specifically includes the steps of:

Grinding the first end face, grinding the edge of the first end face of the semi-finished varistor sheet;

Turn over, turn over the semi-finished varistor sheet;

Grinding the second end surface, grinding the edge of the second end surface of the semi-finished varistor sheet to obtain the finished varistor sheet.

The aluminum-spraying edge-retaining process of the varistor sheet provided by the invention includes an aluminum spraying device, a rotary positioning device and an edge-grinding device. The aluminum spraying device is used to spray aluminum on the two end faces of the piezoresistor to form electrodes, so that the two electrodes of the piezoresistor are connected to form a conductive path. The rotary positioning device is provided with positioning jaws for clamping the piezoresistor, and is used to drive the piezoresistor after spraying aluminum to rotate. The edge grinding device is used for grinding the edges of the two end faces of the piezoresistor piece held by the rotary positioning device. The aluminum spraying device can spray aluminum on the piezoresistor, and the rotary positioning device and the edge grinding device can cooperate to grind the edges of the two end faces of the piezoresistor to realize edge retention on the end face. Compared with the prior art, the aluminum-sprayed edge-spraying system for varistors provided by the present invention can realize automatic aluminum-sprayed edge-spraying of varistors, avoiding the work intensity of manual disassembly and assembly of aluminum-spraying jigs, and improving production efficiency. Efficiency reduces human influence and ensures the stability of production quality.

The aluminum-spraying and edge-retaining process of the piezoresistive sheet provided by the invention includes a step of spraying aluminum on the end surface and a step of grinding the edge. The step of spraying aluminum on the end surface is specifically spraying aluminum on the first end surface and the second end surface of the varistor sheet to obtain a semi-finished product of the varistor sheet. The edge grinding step is specifically to grind the edges of the first end face and the second end face of the varistor semi-finished product, so as to remove the aluminum sprayed part on the edge of the first end face and the second end face, and obtain the finished varistor. Compared with the prior art, the aluminum-spraying process of the varistor provided by the present invention does not need to be equipped with an aluminum-spraying jig before spraying aluminum on the varistor, which reduces the labor intensity and can realize the varistor. Automated production of sprayed aluminum edge to improve production efficiency.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only These are some embodiments of the present invention. Those skilled in the art can also obtain other drawings based on these drawings without creative work.

Fig. 1 is the first kind of flow chart of the aluminum-sprayed edge-retaining process of the varistor sheet disclosed in the embodiment of the present invention;

Fig. 2 is the second flow chart of the process of spraying aluminum and retaining the edge of the varistor sheet disclosed in the embodiment of the present invention;

Fig. 3 is the third kind of flow chart of the aluminum-spraying edge-retaining process of the varistor sheet disclosed in the embodiment of the present invention;

Fig. 4 is a top view of the aluminum-sprayed edge retaining system of the varistor sheet disclosed in the embodiment of the present invention;

Fig. 5 is a schematic structural view of a loading and unloading device disclosed in an embodiment of the present invention;

Fig. 6 is a schematic structural view of the loading and unloading mechanism disclosed in the embodiment of the present invention;

Fig. 7 is a schematic structural diagram of a rotary positioning device disclosed in an embodiment of the present invention;

Fig. 8 is a schematic structural diagram of a polishing device disclosed in an embodiment of the present invention;

Fig. 9 is a schematic structural diagram of a floating mechanism disclosed in an embodiment of the present invention;

Fig. 10 is a schematic structural view of the grinding mechanism disclosed in the embodiment of the present invention;

Fig. 11 is a schematic structural view of a grinding head disclosed in an embodiment of the present invention.

Among them, 100 is the loading and unloading device, 110 is the vacuum system, 120 is the loading and unloading mechanism, 121 is the loading and unloading servo motor, 122 is the loading and unloading reducer, 123 is the retrieving claw, 124 is the retrieving suction cup, and 130 is the vertical feeding claw Mobile module, 200 is a rotary positioning device, 210 is a quick change mechanism, 220 is a positioning jaw, 230 is a multi-channel starting rotary joint, 240 is a rotary positioning reducer, 250 is a rotary positioning servo motor, 300 is an edge grinding device, 310 is a grinding head horizontal moving module, 320 is a grinding head vertical moving module, 330 is a floating mechanism, 340 is an angle adjustment mechanism, 400 is a grinding mechanism, 401 is a grinding head, 410 is a distance sensor.

Detailed ways

The core of the invention lies in disclosing an aluminum-sprayed edge retaining system for piezoresistors, so as to reduce the labor intensity of operators and improve production efficiency.

Another core of the present invention lies in disclosing an aluminum-sprayed edge retention process for piezoresistors, so as to realize the aluminum-sprayed edge retention of piezoresistors.

Hereinafter, an embodiment will be described with reference to the drawings. In addition, the examples shown below do not limit the content of the invention described in the claims in any way. In addition, all the contents of the configurations shown in the following embodiments are not limited to be essential to the solutions of the invention described in the claims.

With reference to FIGS. 4 to 11 , the aluminum-sprayed and edge-retaining system for varistor discs disclosed in the embodiment of the present invention includes an aluminum-spraying device, a rotary positioning device 200 and an edge-grinding device 300 . The aluminum spraying device is used to spray aluminum on the two end faces of the piezoresistor to form electrodes, so that the two electrodes of the piezoresistor are connected to form a conductive path. The rotary positioning device 200 is provided with positioning jaws for clamping the piezoresistor, and is used to drive the piezoresistor after spraying aluminum to rotate. The edging device 300 is used for grinding the edges of the two end surfaces of the piezoresistive sheet clamped by the rotary positioning device 200 . The aluminum spraying device can realize spraying aluminum on the piezoresistor, and the rotary positioning device 200 and the edge grinding device 300 can cooperate to grind the edges of the two end faces of the piezoresistor, so as to realize edge retention on the end faces.

Among them, the automatic aluminum spraying of the aluminum spraying device can reduce the impact on human health during the aluminum spraying process, which is a prior art and will not be repeated here.

Compared with the prior art, the aluminum-sprayed edge-spraying system for varistors disclosed in the embodiments of the present invention can realize automatic aluminum-sprayed edge-spraying of varistors, avoiding the work intensity of manual disassembly and assembly of aluminum-spraying jigs, and improving Improve production efficiency, reduce human influence, and ensure the stability of production quality.

In a specific embodiment disclosed in the present invention, with reference to FIG. 7 , the rotation positioning device 200 includes a positioning jaw 220 and a rotation positioning servo motor 250 . The positioning jaw 220 is used to clamp the piezoresistor, and the rotary positioning servo motor 250 is connected to the positioning jaw 220 in transmission, and is used to drive the three-jaw fixture 220 to clamp the piezoresistor and drive the pressure sensitive Resistor turns.

Further, a rotation positioning reducer 240 is provided between the rotation positioning servo motor 250 and the positioning jaw 220 . After the positioning jaw 220 grabs the piezoresistor after being sprayed with aluminum by the aluminum spraying device, the rotating positioning servo motor 250 drives the positioning jaw 220 to drive the piezoresistor to rotate. At this time, the edging device 300 approaches the piezoresistor And the edge of the first end face of the piezoresistor is polished, after the polishing is completed, the piezoresistor is turned over, and the edge grinding device 300 is used to polish the edge of the second end face of the piezoresistor, and the aluminum on the edge surface is removed to realize The margin of the varistor. Wherein, the positioning jaw 220 may be a three-jaw positioning jaw or a positioning jaw with other structures, and the three-jaw positioning jaw can ensure the centering accuracy.

Referring to FIG. 8 , in order to allow the edging device 300 to conveniently approach the rotary positioning device 200 to chamfer and edge the piezoresistor, the edging device 300 includes a grinding mechanism 400 and a moving module. 10 and 11, the grinding mechanism 400 includes a grinding head 401 for grinding. The moving module includes a grinding head horizontal movement module 310 for driving the grinding mechanism 400 to move in the horizontal direction, and a grinding head horizontal movement module 310 for driving the grinding mechanism 400 to move along the vertical direction. The vertical movement module 320 of the grinding head moving in the direction, the horizontal movement module 310 of the grinding head is arranged on the vertical movement module 320 of the grinding head, and the grinding mechanism 400 is arranged on the horizontal movement module 310 of the grinding head. Through the movement of the grinding head horizontal movement module 310 and the grinding head vertical movement module 320, the grinding head 401 can be driven to move to the edge position of the piezoresistive sheet that needs to be left, or the loading and unloading device 100 can be moved to the rotary positioning device 200 The movement of material is avoided.

It should be noted that the material of the grinding head 401 or the cutter head can be diamond, silicon carbide, boron nitride, etc., and the abrasive particle size can also be selected according to the thickness of different piezoresistors. The size of the grinding knife or grinding head 401 It can also be adjusted according to process requirements.

The grinding mechanism 400 includes a quick-change mechanism 210 for quickly switching the grinding head 401 . The quick change mechanism 210 can realize quick change of the grinding head 401 . Further, the edge grinding device 300 also includes an angle adjustment mechanism 340 for adjusting the grinding angle of the grinding mechanism 400 . The angle adjustment mechanism 340 can control the inclination angle of the grinding head 401 during edge trimming, so as to realize edge retention for different sizes of piezoresistors, and the control is simple.

In a specific embodiment disclosed in the present invention, the grinding mechanism 400 is provided with a distance sensor 410 for measuring the thickness of the piezoresistor sheet. By measuring the thickness of the piezoresistor sheet, the feeding amount of the grinding head 401 or the grinding tool can be better controlled, so as to grind the edge. The feed amount of the knife sharpening or grinding head 401 can be adjusted according to the technological requirements of the piezoresistor, and its optimal range is between 0.3 mm and 0.6 mm (continuously adjustable within 0 mm and 2 mm).

As shown in FIG. 9 , a floating mechanism 330 for controlling the feeding amount of the grinding head 401 is provided between the grinding head horizontal movement module 310 and the grinding head vertical movement module 320 . When there is an error in the diameter of the piezoresistor sheet due to sintering deformation, the floating mechanism 330 will judge whether the grinding head 401 is in contact with the piezoresistor sheet according to the pressure sensor, so as to control the feed amount so that the grinding head 401 or the cutter head and the piezoresistor The sheets fit together to ensure the accuracy of chamfering and edging. The specific structure of the floating mechanism 330 belongs to the prior art, and will not be repeated here.

In a specific embodiment disclosed by the present invention, the system for spraying aluminum edge of the piezoresistor sheet also includes a method for transferring the piezoresistor sheet from the first position where the piezoresistor sheet is sprayed with aluminum by the aluminum spraying device to the position clamped by the rotary positioning device 200 Take the loading and unloading device 100 of the second position. As shown in FIG. 5 and FIG. 6 , the loading and unloading device 100 includes a loading and unloading mechanism 120 and a vertical movement module 130 for material jaws. The loading and unloading mechanism 120 is arranged on the vertical movement module 130 for material jaws and can move vertically. The loading and unloading mechanism 120 includes a picking claw 123 and a loading and unloading servo motor 121 . The retrieving claw 123 is provided with a retrieving suction cup 124 for absorbing the piezoresistive sheet, and the loading and unloading servo motor 121 is connected with the retrieving claw 123 through a loading and unloading deceleration motor 122 to drive the feeding and unloading action of the retrieving claw 123. The material sucker 124 can be driven by the vacuum system 110 to grab the varistor sheet.

When the loading and unloading device 100 places the piezoresistor on the rotary positioning device 200 and the positioning jaws 220 clamp the piezoresistor, the rotation of the rotary positioning device 200 is started to assist the edging device 300 to perform chamfering and edging. Furthermore, during the edging process, the turning over of the varistor sheet can also be realized by the loading and unloading device 100 .

In the embodiment 1 disclosed by the present invention, the aluminum spraying device installed in the aluminum spraying workstation will fully spray aluminum on both ends of the varistor sheet with D45 specification and a thickness of 21 mm. The loading and unloading device 100 places the aluminum-sprayed piezoresistors on the rotary positioning device 200, and the positioning jaws 220 clamp and fix the piezoresistors, and make the piezoresistors perform circular motion. The mobile module moves the grinding head 401 or cutter head with an inclination angle of 30° to the vicinity of the rotary positioning device 200. By controlling the feed amount of the grinding head 401 or cutter head to 2mm, the grinding head 401 or cutter head is sensitive to pressure. The automatic chamfering edge of the first end face of the resistor sheet. The piezoresistor that has been edged on one side is turned over to realize automatic chamfering of the second end face of the piezoresistor, and the chamfered piezoresistor is sent to the subsequent process through the conveyor belt.

In the embodiment 2 disclosed by the present invention, the aluminum spraying device installed in the aluminum spraying workstation will spray aluminum on both ends of the varistor sheet with D52 specification and a thickness of 23 mm. The loading and unloading device 100 places the aluminum-sprayed piezoresistors on the rotary positioning device 200, and the positioning jaws 220 clamp and fix the piezoresistors, and make the piezoresistors perform circular motion. The mobile module moves the grinding head 401 or cutter head with an inclination angle of 45° to the vicinity of the rotary positioning device 200. By controlling the feed amount of the grinding head 401 or cutter head to 0 mm, the grinding head 401 or cutter head is pressure sensitive. The automatic chamfering edge of the first end face of the resistor sheet. The piezoresistor that has been edged on one side is turned over to realize automatic chamfering of the second end face of the piezoresistor, and the chamfered piezoresistor is sent to the subsequent process through the conveyor belt.

In Embodiment 3 disclosed by the present invention, the aluminum spraying device installed in the aluminum spraying workstation will spray aluminum on both ends of the piezoresistor sheet with D71 specification and a thickness of 25 mm. The loading and unloading device 100 places the aluminum-sprayed piezoresistors on the rotary positioning device 200, and the positioning jaws 220 clamp and fix the piezoresistors, and make the piezoresistors perform circular motion. The mobile module moves the grinding head 401 or cutter head with an inclination angle of 60° to the vicinity of the rotary positioning device 200. By controlling the feed amount of the grinding head 401 or cutter head to 1mm, the grinding head 401 or cutter head is sensitive to pressure. The automatic chamfering edge of the first end face of the resistor sheet. The piezoresistor that has been edged on one side is turned over to realize automatic chamfering of the second end face of the piezoresistor, and the chamfered piezoresistor is sent to the subsequent process through the conveyor belt.

It should be noted that the thickness of the varistor sheet can be 5 mm to 40 mm, and the specifications of the varistor sheet include: D30, D34, D40, D45, D48, D52, D60, D71, D85, D105, D115, D136, etc.

The embodiment of the present invention discloses that the system for spraying aluminum edges of piezoresistors further includes an electric control system for supplying power and controlling the aluminum spraying device, the rotating positioning device 200 and the edging device 300 . The electronic control system integrates the industrial robot control system development platform, motion controller and six-axis servo drive, and is based on the WINCE operating system and the architecture design of Industry 4.0. The integrated iso-ring network protocol meets the real-time and safety requirements of robot applications. The requirements of performance and stability can realize the monitoring of the status of field equipment. The chamfering and edging process of the piezoresistor chip disclosed in the embodiment of the present invention by the aluminum spraying and edge retention system has the performance up to the standard and high consistency, and can realize accurate pouring of multiple types and specifications of the resistor chip. side.

As shown in FIG. 1 , the aluminum-spraying edge-retaining process of the varistor chip disclosed in the embodiment of the present invention includes a step of spraying aluminum on the end face and a step of edge grinding.

S10, spray aluminum on the end face;

Spray aluminum on the first end surface and the second end surface of the varistor sheet to obtain a semi-finished product of the varistor sheet. The production process of the varistor sheet needs to spray aluminum on both ends (the first end surface and the second end surface) of the varistor sheet to form electrodes as conductive paths.

S20, edge grinding;

Grinding the edges of the first end face and the second end face of the semi-finished varistor to remove the aluminum sprayed parts on the edge of the first end face and the second end face to obtain the finished varistor.

Compared with the prior art, the aluminum-spraying process of the varistor disclosed in the embodiment of the present invention does not need to be equipped with an aluminum-spraying jig before spraying aluminum on the varistor, which reduces the labor intensity and can realize the varistor The automatic production of the aluminum-sprayed edge of the sheet improves the production efficiency.

With reference to Figure 2, there are steps between S10 and S20:

S30, grinding and feeding;

Transferring the semi-finished varistor chip from the first position for the step of spraying aluminum on the end surface to the second position for the step of edge grinding can be realized by the loading and unloading device 100 of the above-mentioned aluminum spraying edge retention system for the varistor chip S30.

S40, grinding and blanking;

Transfer the finished piezoresistor from the second position to the third position for the follow-up process, S40 can be realized through the loading and unloading device 100 of the above-mentioned aluminum spraying and edge-spraying system for the piezoresistor, and the spraying of the piezoresistor is completed. Aluminum trim.

With reference to Figure 3, S20 specifically includes steps:

S21, grinding the first end face;

Grinding the edge of the first end face of the semi-finished varistor sheet.

S22, turn over;

Turn over the semi-finished varistor sheet, that is, turn the polished first end face into the second end face.

S23, grinding the second end face;

Grinding the edge of the second end face of the semi-finished varistor sheet to obtain a finished varistor sheet.

The terms "first" and "second" in the specification and claims of the present invention and the above drawings are used to distinguish different objects, rather than to describe a specific order. Furthermore, the terms "comprising" and "having", and any variations thereof, are intended to cover a non-exclusive inclusion. For example, a process, method, system, product or apparatus comprising a series of steps or units is not defined by listed steps or units, but may include unlisted steps or units.

The above description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the present invention will not be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (10)

1. An aluminium spraying edge reserving system for a voltage-sensitive resistor disc, which is characterized by comprising:

the aluminum spraying device is used for spraying aluminum to the two end surfaces of the piezoresistor disc;

the rotary positioning device (200) is provided with a positioning clamping jaw (220) for clamping the piezoresistor disc and is used for driving the piezoresistor disc subjected to aluminum spraying to rotate;

and the edge grinding device (300) is used for grinding the edges of the two end faces of the piezoresistor disc clamped by the rotary positioning device (200).

2. The sprayed aluminum edge system of a varistor sheet as claimed in claim 1, wherein said rotary positioning means (200) comprise:

the positioning jaw (220);

and the rotary positioning servo motor (250) is in transmission connection with the positioning clamping jaw (220) and is used for driving the positioning clamping jaw (220) to clamp the piezoresistor disc and drive the piezoresistor disc to rotate.

3. The sprayed aluminum edge-leaving system for varistor sheets of claim 1, wherein said edge-grinding device (300) comprises:

a grinding mechanism (400) including a grinding head (401) for grinding;

the movable module comprises a grinding head horizontal movement module (310) and a grinding head vertical movement module (320), the grinding head horizontal movement module (310) is used for driving the grinding mechanism (400) to move along the horizontal direction, the grinding head vertical movement module (320) is used for driving the grinding mechanism (400) to move along the vertical direction, the grinding head horizontal movement module (310) is arranged on the grinding head vertical movement module (320), and the grinding mechanism (400) is arranged on the grinding head horizontal movement module (310).

4. The sprayed aluminum edge system of a varistor sheet as claimed in claim 3, characterized in that the grinding mechanism (400) comprises a quick-change mechanism (210) for quickly switching the grinding head (401).

5. The sprayed aluminum edge system of a varistor sheet as in claim 3, wherein said grinding mechanism (400) is provided with a distance sensor (410) for measuring the thickness of said varistor sheet.

6. The sprayed aluminum edge-leaving system for a varistor sheet as claimed in claim 3, wherein a floating mechanism (330) for controlling the amount of feed of said grinding head (401) is provided between said grinding head horizontal movement module (310) and said grinding head vertical movement module (320).

7. The aluminum spraying edge reserving system for the varistor sheet as claimed in claim 1, further comprising a loading and unloading device (100) for transferring the varistor sheet from a first position where the aluminum spraying device sprays aluminum to a second position where the varistor sheet is clamped by the rotary positioning device (200), wherein the loading and unloading device (100) comprises:

the material taking claw (123), wherein a material taking sucker (124) is arranged on the material taking claw (123);

and the feeding and discharging servo motor (121), the feeding and discharging servo motor (121) is in transmission connection with the material taking claw (123) and is used for driving the material taking claw (123) to move.

8. An aluminum spraying edge reserving process for a voltage-sensitive resistor disc is characterized by comprising the following steps:

spraying aluminum on the end faces, namely spraying aluminum on the first end face and the second end face of the piezoresistor disc to obtain a semi-finished piezoresistor disc;

and (3) edge polishing, namely polishing the edges of the first end face and the second end face of the semi-finished product of the piezoresistor disc to obtain a finished product of the piezoresistor disc.

9. The sprayed aluminum edge leaving process for a varistor as claimed in claim 8, wherein between said end spraying aluminum step and said edge grinding step further comprising the steps of:

polishing and feeding, namely transferring the semi-finished product of the piezoresistor sheet from a first position for carrying out the end face aluminum spraying step to a second position for carrying out the edge polishing step;

the method further comprises the following steps after the edge grinding step:

and (5) polishing and blanking, and transferring the finished piezoresistor sheet from the second position to a third position for subsequent processes.

10. The sprayed aluminum edge-leaving process for varistor sheets as claimed in claim 8, wherein said edge grinding step comprises the steps of:

polishing the first end face, and polishing the edge of the first end face of the semi-finished piezoresistor sheet;

turning over, namely turning over the semi-finished product of the piezoresistor;

and polishing the second end face, namely polishing the edge of the second end face of the semi-finished product of the voltage-sensitive resistor sheet.

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