Miniature laser cutting device for NTC (Negative Temperature Coefficient) thermistor chip

Abstract

The utility model relates to the technical field of thermistor production, in particular to a miniature laser cutting device for an NTC thermistor chip, which comprises a laser tool rest and a laser tool bit, a placing frame assembly is arranged at the lower end of the laser tool bit, a limiting test assembly is mounted on the inner side of the placing frame assembly, and the placing frame assembly comprises an upper transverse plate. The inner side of the upper transverse plate is fixedly connected with a placing plate, the bottom end of the upper transverse plate is fixedly connected with a hollow frame, the inner side of the hollow frame is fixedly connected with a waterproof elastic film, the upper end of the waterproof elastic film is fixedly connected with a heat exchange metal sheet in a bonding mode, the bottom end of the hollow frame is fixedly connected with a partition plate, and the bottom end of the partition plate is fixedly connected with a corrugated pipe. According to the NTC thermistor chip performance testing device, in the process of trial cutting of the NTC thermistor chip, the NTC thermistor chip performance testing can be carried out without taking down the NTC thermistor chip, due to the design, multiple times of tool setting operation are avoided, the operation procedure is simplified, the testing time is shortened, and the production process is more coherent and efficient.

Description

Technical Field

[0001] This utility model relates to the field of thermistor manufacturing technology, specifically a miniature laser cutting device for NTC thermistor chips. Background Technology

[0002] NTC thermistor chips are semiconductor materials with a negative temperature coefficient, mainly made of sintered metal oxides such as manganese, cobalt, nickel, and copper. They can change their resistance by sensing changes in ambient temperature. When used with circuits, the resistance change can be converted into an electrical signal to achieve precise temperature measurement or control. As an indispensable temperature sensor element, it is widely used in various electronic devices.

[0003] When manufacturing NTC thermistors, the chips usually need to be finely cut to achieve specific sizes or shapes. Micro laser cutting devices are often used in the production of NTC thermistor chips because of their high precision and small heat-affected zone.

[0004] However, the high cutting precision of the micro laser cutting device requires precise alignment of the laser head. Since the NTC thermistor needs to undergo multiple resistance performance tests during the trial cutting process, if the NTC thermistor is removed and put back each time the resistance performance test is performed, the laser head needs to be positioned multiple times, which reduces production efficiency and increases labor intensity. Therefore, a micro laser cutting device for NTC thermistor chips is proposed to address the above problems. Utility Model Content

[0005] The purpose of this invention is to provide a miniature laser cutting device for NTC thermistor chips, in order to solve the problem that since the NTC thermistor chip needs to undergo multiple resistance performance tests during the trial cutting process, if the NTC thermistor chip is removed and put back each time the resistance performance test is performed, the laser cutting head needs to be positioned multiple times, which leads to reduced production efficiency and increased labor intensity.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] A micro laser cutting device for an NTC thermistor chip, comprising a laser tool holder and a laser tool head. A placement frame assembly is provided at the lower end of the laser tool head, and a limit test assembly is installed inside the placement frame assembly. The placement frame assembly includes an upper cross plate, a placement plate is fixedly connected inside the upper cross plate, a hollow frame is fixedly connected to the bottom end of the upper cross plate, a waterproof elastic membrane is fixedly connected inside the hollow frame, a heat exchange metal sheet is fixedly connected to the upper end of the waterproof elastic membrane by bonding, a partition plate is fixedly connected to the bottom end of the hollow frame, a bellows is fixedly connected to the bottom end of the partition plate, a lower support cross plate is fixedly connected to the bottom end of the bellows, and a spring support column is fixedly connected to the upper end of the lower support cross plate. The limit test assembly includes a shaft column, a metal reed is rotatably connected to the outside of the shaft column, a rotating column is rotatably connected to the bottom end of the shaft column, a rotating ring is fixedly connected through the rotating column, and a threaded column is spirally connected inside the rotating column.

[0008] As a further optimized content of the present utility model, wherein: a plurality of hemispherical protrusions are provided on the upper end of the placement plate, which are evenly spaced and distributed in a rectangular array. The bottom end surface of the placement plate is on the same horizontal plane as the bottom end surface of the upper cross plate, and the bottom end surface of the placement plate is closely attached to the upper end surface of the heat exchange metal sheet.

[0009] As a further optimized content of the present utility model, wherein: the projection of the hollow frame in the vertical direction is in the shape of a "hui", the horizontal projection of the hollow frame is rectangular, and the partition plate and the upper cross plate are parallel to each other.

[0010] As a further optimized content of the present utility model, wherein: the center point of the bellows and the center point of the partition plate are on the same vertical line, and a circular through hole is opened at the center of the inner side of the partition plate and has the same diameter as the inner diameter of the bellows.

[0011] As a further optimized content of the present utility model, wherein: there are four spring support columns, the four spring support columns are parallel to each other, and the four spring support columns are distributed in a rectangular array at the four corner areas at the bottom end of the partition plate.

[0012] As a further optimized content of the present utility model, wherein: there are two limit test assemblies, the two limit test assemblies are symmetrically distributed on both sides of the placement plate, the shaft column is fixedly connected through the upper cross plate, and the bottom end of the metal reed is arc-shaped.

[0013] As a further optimized content of the present utility model, wherein: the central axis of the rotating column and the central axis of the rotating ring are on the same straight line, the rotating ring is arranged above the partition plate, and the bottom end of the threaded column is fixedly connected to the lower support cross plate.

[0014] Compared with the prior art, the beneficial effects of the present utility model are:

[0015] In this invention, the placement rack assembly and the limiting test assembly allow the device to perform NTC thermistor chip performance testing without removing it during the test cutting process. This design avoids multiple cutting operations, simplifies the operation procedure, shortens the testing time, and makes the production process more continuous and efficient. At the same time, it can quickly absorb the heat generated when the NTC thermistor chip is cut during the testing process, allowing the NTC thermistor chip to quickly return to room temperature and preventing heat accumulation from affecting the test accuracy. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0017] Figure 2 This is a schematic diagram of the structure of the placement rack assembly of this utility model;

[0018] Figure 3 This is a cross-sectional view of the placement rack assembly of this utility model;

[0019] Figure 4 This is an exploded view of the placement rack assembly of this utility model;

[0020] Figure 5 This is a schematic diagram of the installation position of the heat exchange metal sheet of this utility model;

[0021] Figure 6 This is a schematic diagram of the limit test component of this utility model.

[0022] In the image: 1. Laser scalpel holder; 2. Laser scalpel head;

[0023] 3. Shelf assembly; 31. Upper horizontal plate; 32. Placement plate; 33. Hollow frame; 34. Waterproof elastic membrane; 35. Heat exchange metal sheet; 36. Partition; 37. Corrugated pipe; 38. Lower support horizontal plate; 39. Spring support column;

[0024] 4. Limit test assembly; 41. Shaft column; 42. Metal spring; 43. Rotating column; 44. Rotating ring; 45. Threaded column. Detailed Implementation

[0025] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0026] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0027] Please see Figure 1-6 This utility model provides a technical solution:

[0028] A miniature laser cutting device for NTC thermistor chips includes a laser cutter holder 1 and a laser cutter head 2. A placement frame assembly 3 is provided at the lower end of the laser cutter head 2. A limit test assembly 4 is installed inside the placement frame assembly 3. The placement frame assembly 3 includes an upper horizontal plate 31, a placement plate 32 is fixedly connected to the inner side of the upper horizontal plate 31, a hollow frame 33 is fixedly connected to the bottom end of the upper horizontal plate 31, a waterproof elastic membrane 34 is fixedly connected to the inner side of the hollow frame 33, and a heat exchange metal is fixedly connected to the upper end of the waterproof elastic membrane 34 by adhesive bonding. The hollow frame 33 has a partition plate 36 fixedly connected to its bottom end, a corrugated pipe 37 fixedly connected to its bottom end, a lower support plate 38 fixedly connected to its bottom end, a spring support column 39 fixedly connected to its upper end, and a limit test assembly 4 including a shaft column 41. A metal spring 42 is rotatably connected to the outside of the shaft column 41, a rotating column 43 is rotatably connected to the bottom end of the shaft column 41, a rotating ring 44 is fixedly connected through the rotating column 43, and a threaded column 45 is spirally connected to the inside of the rotating column 43.

[0029] As a further implementation of this solution, the upper end of the placement plate 32 is provided with several uniformly spaced hemispherical protrusions arranged in a rectangular array. The bottom surface of the placement plate 32 is on the same horizontal plane as the bottom surface of the upper horizontal plate 31. The bottom surface of the placement plate 32 is in close contact with the upper surface of the heat exchange metal sheet 35. The vertical projection of the hollow frame 33 is a "U" shape, and the horizontal projection of the hollow frame 33 is a rectangle. The partition plate 36 is parallel to the upper horizontal plate 31. This design allows the coolant inside the hollow frame 33 to better support the heat exchange metal sheet 35 by applying force to the waterproof elastic membrane 34, thereby making the heat exchange metal sheet 35 and the placement plate 32 in close contact, so as to cool the NTC thermistor chip placed on the placement plate 32. The coolant temperature used in this invention is controlled at 25℃±0.1℃, which can ensure that the NTC thermistor chip is processed and cut at room temperature (25℃±0.1℃), and ensure the accuracy of the NTC thermistor chip for performance testing without removal.

[0030] As a further implementation of this scheme, the center point of the bellows 37 and the center point of the partition 36 are on the same vertical line. A circular through hole with the same diameter as the inner diameter of the bellows 37 is opened at the center of the inner side of the partition 36. Four spring support columns 39 are provided, which are parallel to each other and are arranged in a rectangular array at the four corners of the bottom of the partition 36. This design allows the bellows 37 to be subjected to a vertical downward force when the partition 36 moves downward, so that it can better recover its deformation later.

[0031] As a further implementation of this solution, two limit test components 4 are provided. The two limit test components 4 are symmetrically distributed on both sides of the placement plate 32. The upper horizontal plate 31 is fixedly connected through the shaft column 41. The bottom end of the metal spring 42 is arc-shaped. The symmetrical distribution of the two limit test components 4 can better limit the thermistor and prevent it from shifting when the resistance is tested. The arc-shaped bottom end of the metal spring 42 allows the metal spring 42 to better press the thermistor with its own elastic potential energy.

[0032] As a further implementation of this scheme, the central axis of the rotating column 43 and the central axis of the rotating ring 44 are on the same straight line. The rotating ring 44 is set above the partition plate 36. The bottom end of the threaded column 45 is fixedly connected to the lower support plate 38. The rotating ring 44 is set above the partition plate 36 so that while the rotating ring 44 rotates and moves downward with the rotating column 43, it can apply downward pressure to the partition plate 36, thereby strengthening the mutual cooperation of the components.

[0033] Workflow: When using this device, the NTC thermistor chip to be cut is first placed on the placement plate 32. Then, the laser cutter head 2 is controlled to slide on the laser cutter holder 1 and move to a suitable position. Next, the laser cutter head 2 is activated to perform a trial cut on the NTC thermistor chip. After one trial cut is completed, the metal spring 42 is rotated, bringing a portion of the metal spring 42 above the thermistor. Then, the rotating ring 44 is rotated, causing the fixedly connected rotating column 43 to rotate, changing the relative position of the rotating column 43 and the threaded column 45. Simultaneously, the rotating column 43, through the shaft column 41, also drives the metal spring 42 downwards, pressing it onto the resistor. Due to the elasticity and the curvature of the bottom end of the metal spring 42, it can stably press against the thermistor. Simultaneously, as the rotating ring 44 moves downwards, it compresses the bellows 37 through the partition 36, causing it to contract. At this time, the coolant inside the bellows 37 enters the hollow frame 33 through the holes starting from the inner side of the partition 36. This increases the volume of coolant in the hollow frame 33, pushing the waterproof elastic membrane 34 upwards. The force from the coolant pushes the heat exchange metal sheet 35 upwards, causing it to adhere tightly to the bottom of the placement plate 32. This rapidly cools the NTC thermistor chip placed on the placement plate 32 (controlled at room temperature (25℃±0.1℃)), ensuring measurement accuracy and allowing it to quickly return to room temperature after laser cutting. At this point, the resistance of the thermistor can be detected by the wire connected to the metal spring 42. After detection, the rotating ring 44 can be rotated to drive the rotating column 43 to rotate outside the threaded column 45, causing the rotating ring 44 to gradually separate from the partition plate 36. At this point, the partition plate 36, no longer under the pressure of the rotating ring 44, will reset under the action of the spring support column 39. Then, the metal spring 42 can be rotated to remove it from above the thermistor, allowing the trial cutting operation to continue. Once the cutting program is determined, a new NTC thermistor chip can be replaced for batch cutting.

[0034] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A miniature laser cutting device for NTC thermistor chips, comprising a laser cutter holder (1) and a laser cutter head (2), characterized in that: A placement rack assembly (3) is provided at the lower end of the laser cutter head (2), and a limit testing component (4) is installed inside the placement rack assembly (3). The placement rack assembly (3) includes an upper cross plate (31). A placement plate (32) is fixedly connected inside the upper cross plate (31). A hollow frame (33) is fixedly connected to the bottom end of the upper cross plate (31). A waterproof elastic membrane (34) is fixedly connected inside the hollow frame (33). A heat exchange metal sheet (35) is fixedly connected to the upper end of the waterproof elastic membrane (34) by adhesion. A partition plate (36) is fixedly connected to the bottom end of the hollow frame (33). A corrugated pipe (37) is fixedly connected to the bottom end of the partition plate (36). A lower support cross plate (38) is fixedly connected to the bottom end of the corrugated pipe (37). A spring support column (39) is fixedly connected to the upper end of the lower support cross plate (38). The limit testing component (4) includes a shaft column (41). A metal reed (42) is rotatably connected to the outside of the shaft column (41). A rotating column (43) is rotatably connected to the bottom end of the shaft column (41). A rotating ring (44) is fixedly connected through the rotating column (43). A threaded column (45) is screwed inside the rotating column (43).

2. The micro laser cutting device for NTC thermistor chip according to claim 1, characterized in that: A number of hemispherical protrusions are provided on the upper end of the placement plate (32), which are evenly spaced and distributed in a rectangular array. The bottom end face of the placement plate (32) is on the same horizontal plane as the bottom end face of the upper cross plate (31), and the bottom end face of the placement plate (32) is closely attached to the upper end face of the heat exchange metal sheet (35).

3. The micro laser cutting device of NTC thermistor chip according to claim 1, characterized in that: The projection of the hollow frame (33) in the vertical direction is "回" shaped, the horizontal projection of the hollow frame (33) is rectangular, and the partition plate (36) and the upper cross plate (31) are parallel to each other.

4. The micro laser cutting device for NTC thermistor chip according to claim 1, characterized in that: The center point of the corrugated pipe (37) and the center point of the partition plate (36) are on the same vertical line. A circular through hole is provided at the center of the inner side of the partition plate (36) and has the same diameter as the inner diameter of the corrugated pipe (37).

5. The micro laser cutting device of NTC thermistor chip according to claim 1, characterized in that: There are four spring support columns (39). The four spring support columns (39) are parallel to each other and are distributed in a rectangular array at the four corner areas at the bottom end of the partition plate (36).

6. The micro laser cutting device of NTC thermistor chip according to claim 1, characterized in that: There are two limit testing components (4). The two limit testing components (4) are symmetrically distributed on both sides of the placement plate (32). The shaft column (41) is fixedly connected through the upper cross plate (31), and the bottom end of the metal reed (42) is arc-shaped.

7. The micro laser cutting device of NTC thermistor chip according to claim 1, characterized in that: The central axis of the rotating column (43) and the central axis of the rotating ring (44) are on the same straight line. The rotating ring (44) is arranged above the partition plate (36), and the bottom end of the threaded column (45) is fixedly connected to the lower support cross plate (38).

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