CN106686889B

CN106686889B - TDS pen

Info

Publication number: CN106686889B
Application number: CN201611081963.4A
Authority: CN
Inventors: 陈洪生
Original assignee: Zhengzhou Yuelong Electronic Technology Co ltd
Current assignee: Zhengzhou Yuelong Electronic Technology Co ltd
Priority date: 2016-11-30
Filing date: 2016-11-30
Publication date: 2021-08-27
Anticipated expiration: 2036-11-30
Also published as: CN106686889A

Abstract

The invention relates to a TDS pen, which comprises a shell, a test needle and a mainboard, wherein the test needle is arranged at the front end of the shell, a test needle contact conductive part is arranged on the test needle, a mainboard contact conductive part which is in contact fit with the test needle contact conductive part is arranged on the mainboard, and the mainboard is fixedly arranged in an inner cavity of the shell through a detachable fixing structure. According to the invention, the main board is inserted into the insulating shell in a guiding manner, and the conductive part on the main board is in contact fit with the test pin when the main board is inserted in place. When the mainboard damaged, can pull down the mainboard maintenance or the mainboard of more renewal, TDS pen reuse many times.

Description

TDS pen

Technical Field

The invention relates to a TDS pen.

Background

The TDS pen mainly comprises an insulating shell, a test needle and a main board with a circuit. In the prior art, an insulating shell and a test needle are arranged in a split manner, a through hole for the test needle to penetrate through is reserved at the front end of the insulating shell, in order to prevent poor contact between the test needle and a mainboard, the test needle is welded at the front end position of the mainboard in the prior art, the insulating shell is provided with a front end plate, and the through hole is reserved on the front end plate; when the test device is assembled, the main board with the test needle is arranged in the insulating shell from the rear end of the insulating shell, and the test needle penetrates through the through hole of the front end plate; the test needle is not tightly matched with the inner wall of the through hole, and the test needle and the insulating shell are required to be sealed by gluing. TDS among the prior art pen has mainboard and the trouble problem of test pin welding process on the one hand, and in the on the other hand use, the mainboard is in case damage then can't dismantle the maintenance, can only scrap TDS pen wholly.

Disclosure of Invention

The invention aims to provide a TDS pen, which is used for solving the technical problems that a welding process of a main board and a test pin is troublesome and the main board cannot be detached and maintained in the prior art.

In order to achieve the purpose, the technical scheme of the invention is as follows:

the utility model provides a TDS pen, includes shell, test needle and mainboard, and the front end of shell is located to the test needle, is equipped with test needle contact conductive part on the test needle, is equipped with on the mainboard to be used for contacting complex mainboard contact conductive part with test needle contact conductive part, the mainboard sets firmly in the inner chamber of shell through removable fixed knot structure.

The inner cavity of the shell is internally provided with a guide structure for the main board to be assembled from back to front, and the guide structure comprises guide grooves which are arranged on the left side and the right side of the shell and used for the main board to be assembled from back to front.

Be equipped with the last conducting bar and the lower conducting bar that the fore-and-aft direction extends on the inside wall about the shell, the guide slot is formed between last conducting bar and lower conducting bar, and the length of going up the conducting bar is less than the length of conducting bar down, and the front end of lower conducting bar lies in the rear of last conducting bar front end, and the rear formation of going up the conducting bar is used for dodging the space of dodging of operating button on the mainboard.

The end faces of the rear ends of the upper guide bar and the lower guide bar are guide inclined planes which are gradually inclined towards the inner side of the guide groove from back to front.

The testing needle conductive part is the outer peripheral face of the testing needle, and the mainboard contact conductive part is in contact fit with the outer peripheral face of the testing needle.

The mainboard contact conductive part is a pad arranged on one side of the mainboard, and the pad is provided with a pad end face of a plane structure in contact fit with the peripheral surface of the corresponding test needle.

The mainboard is protruding style of calligraphy, and the left and right sides of protruding style of calligraphy mainboard has the fender shoulder that is used for with shell stop cooperation.

The shell inner wall is provided with a reinforcing rib above the test needle, and a space for the front end part of the mainboard to enter is arranged between the lower side surface of the reinforcing rib and the outer peripheral surface of the test needle.

The reinforcing rib is provided with a guide surface which is inclined from back to front gradually towards the test needle and is used for being matched with the front end of the main board in a guide way.

The detachable fixing structure comprises a pen tail cover buckled at the rear end of the shell, and the main board is fixed in the shell under the blocking action of the pen tail cover.

The invention has the beneficial effects that: the mainboard is provided with a mainboard contact conductive part, the test pin is provided with a test pin contact conductive part, after the mainboard is inserted into the shell, the test pin contact conductive part is in contact fit with the mainboard contact conductive part, and the mainboard is fixedly arranged in the inner cavity of the shell through a detachable fixing structure to prevent the mainboard from moving in the shell. According to the invention, the main board can be pulled out from the shell for maintenance through a contact matching mode between the main board and the test needle, so that the whole pen cannot be scrapped even if the main board is damaged, and the TDS pen can be reused.

Drawings

FIG. 1 is a schematic structural diagram of a TDS pen according to an embodiment 1 of the present invention (without a motherboard);

FIG. 2 is a sectional view taken along line A-A of FIG. 1;

FIG. 3 is a schematic structural diagram of a main board of an embodiment 1 of a TDS pen according to the present invention;

FIG. 4 is an exploded view of an embodiment 1 of a TDS pen of the invention;

FIG. 5 is a schematic diagram of an overall structure of an embodiment 1 of the TDS pen of the invention;

FIG. 6 is a sectional view taken along line A-A of FIG. 5;

fig. 7 is an enlarged view of a portion I of fig. 6.

Detailed Description

The following further describes embodiments of the present invention with reference to the drawings.

Referring to fig. 1 to 7, a TDS pen according to an embodiment of the present invention includes a housing, a test pin 2, and a main board 3. The shell is insulating housing 1, and insulating housing 1's front end is located to test needle 2, and insulating housing 1 includes injection moulding in the front end plate 11 on the 2 outer peripheral faces of test needle, and front end plate 11 and test needle 2 form overall structure. Preferably, the insulating housing 1 is integrally injection molded, and the front end portion of the test needle 2 is located outside the insulating housing and the rear end portion is located inside the insulating housing. After molding, the outer peripheral surface of the test needle 2 is tightly combined with the front end plate 11 of the insulating shell. The periphery of the testing needle 2 is provided with a needle sleeve 12 and a boss 13, the front end of the needle sleeve 12 extends out of the insulating shell, the rear end of the needle sleeve 12 is located inside the insulating shell, two ends of the testing needle 2 are respectively exposed outside the needle sleeve 12, the boss 13 is located on the front side of the front end plate, the needle sleeve 12 and the boss 13 form a needle seat structure, the stability of the testing needle is guaranteed, and the phenomenon of short circuit caused by the movement of the two testing needles is avoided.

The main board 3 is inserted into the insulating housing 1 from the back to the front in a guiding way and is fixedly arranged in the inner cavity of the insulating housing through a detachable fixing structure, the detachable fixing structure comprises a pen tail cover 18 buckled at the rear end of the insulating housing, and the main board is fixed in the insulating housing under the stopping action of the pen tail cover 18. The lower side plate surface of the mainboard 3 is provided with pads 4 which are in one-to-one correspondence with the test needles 2, the lower side surface of each pad 4 is a pad end surface of a plane structure which is in contact fit with the outer peripheral surface of the corresponding test needle, the pads 4 form a mainboard contact conductive part, and the outer peripheral surface of each test needle forms a test needle contact conductive part. All be equipped with upper conducting bar 5 and lower conducting bar 6 that the fore-and-aft direction extends on the inside wall about insulating casing 1, form the guide slot that extends along the fore-and-aft direction between upper conducting bar 5 and the lower conducting bar 6, the guide slot constitutes guide structure. When the main board is installed, the edges of the left side and the right side of the main board 3 are respectively inserted into the guide grooves of the corresponding sides from back to front, and the main board 3 is pushed forwards to enable the main board to slide along the guide grooves; when the mainboard 3 is inserted in place, the lower side surface of the bonding pad 4 is in conductive contact fit with the peripheral surface of the testing needle 2.

In this embodiment, the rear end faces of the upper conducting bar 5 and the lower conducting bar 6 are both guiding inclined planes which are gradually inclined towards the inner side of the guiding groove from back to front. In order to avoid the interference between the upper guide bar 5 and the buttons on the main board 3, the length of the upper guide bar 5 is smaller than that of the lower guide bar 6, the rear end of the lower guide bar is positioned behind the rear end of the upper guide bar, and an avoiding space for avoiding the operating buttons on the main board is formed behind the upper guide bar. In other embodiments, the inner side wall of the insulating shell can be provided with a guide groove without an upper guide bar and a lower guide bar.

In this embodiment, the main board 3 is in a shape of a Chinese character 'tu', the main board includes a front board portion 31 and a rear board portion 32, the bonding pad 4 is disposed on the lower side of the front board portion 31, and two side edges of the rear board portion 32 form shoulders which form the stop limit structure. The insulating shell 1 comprises a large hole section 14 and a small hole section 15 positioned at the front end of the large hole section, a step 16 is formed between the large hole section 14 and the small hole section 15, the step 16 is provided with a step surface positioned in the insulating shell, and the step surface forms a stop limit structure for stop matching with a mainboard; when the mainboard 3 is inserted in place, the stop shoulder of the convex-shaped mainboard is in stop fit with the step surface in the insulating shell, the front plate part 31 of the mainboard 3 is positioned in the small hole section 15 of the insulating shell, the lower side surface of the bonding pad 4 is in conductive contact fit with the outer peripheral surface of the test needle, and the rear plate part 32 of the mainboard is left in the large hole section 14. Be equipped with strengthening rib 7 in the top of testing needle on the insulating casing inner wall, have the space that supplies mainboard 3 to get into between the downside of strengthening rib 7 and the outer peripheral face of testing needle 2, the downside constitution of strengthening rib 7 be used for with the spacing complex spacing face 71 of the last side of mainboard 3. The rear side of the reinforcing rib 7 has a guide surface 72 which is inclined gradually from the rear to the front toward the test pin.

The front end plate 11 of the insulating shell 1 is provided with a guard 8 at the periphery of the test needle 2 for protecting the test needle. The U-shaped groove 81 has been seted up on the 8 lateral walls of fender, and when TDS pen inserted the test in water, the air in the fender 8 can be followed U-shaped groove 81 and discharged, prevents that the bubble from producing. The small hole section 15 of the insulating shell 1 is connected with a pen cap 17, and the step of the insulating shell is in limit fit with the pen cap 17. In order to facilitate the insertion and extraction of the pen cap 17, the small hole section 15 is of a necking structure which gradually decreases from back to front, and the outer side wall of the small hole section 15 is an inclined surface which gradually inclines into the hole from back to front. Meanwhile, the upper and lower side walls of the small hole section 15 are provided with strip-shaped protrusions 151 extending in the front-rear direction, so that the pen cap 17 is easily covered and is not easy to fall off. The upper and lower side walls of the cap 17 are provided with anti-slip protrusions 171 extending in the left-right direction to prevent slipping of hands and facilitate insertion and removal. The inside of the tail cap 18 is provided with a battery jar 181 for mounting a button battery and a conductive sheet (not shown) for connecting the battery and the main board. The upper side wall of the large-hole section 14 is provided with a window for displaying numerical values, the middle part of the lower side wall is provided with a groove, the bottom of the groove is provided with three parallel long circular holes 9 distributed at intervals along the length direction of the insulating shell, the three long circular holes 9 are process holes, an integral structure is required to be formed with the test needle due to the fact that the insulating shell is long in cavity, the three process holes are added to the middle part of the insulating shell cavity, positioning is achieved, injection molding is uniform during pouring, and the quantity of defective products is reduced. The insulating shell 1 is adhered with a surface sticker which seals the three oblong holes 9.

When the TDS pen is assembled, the mainboard 3 is inserted into the insulating shell 1 from the rear end of the insulating shell 1 in a guiding manner, the mainboard 3 moves along the guide groove in a guiding manner, the front end part of the mainboard 3 extends into the space between the reinforcing ribs 7 and the test needles 2, when the retaining shoulders of the mainboard are in retaining fit with the boss surface of the insulating shell, namely the mainboard is inserted in place, the bonding pads 4 on the lower side of the mainboard 3 are in conductive contact fit with the peripheral surface of the test needles 2, the tail cover is covered, the mainboard 3 is prevented from moving in the insulating shell, and the cap is covered.

In other embodiments, the main board contact conductive part may also be a conductive sheet disposed on the front end face of the main board, the test pin contact conductive part may also be the rear end face of the test pin, and the main board contact conductive part is top-press-fitted with the rear end face of the test pin; or the end part of the mainboard is provided with a conducting plate, the lower side plate surface is provided with a bonding pad, the conducting plate is in top pressing fit with the end part of the testing needle, and the bonding pad is in contact fit with the peripheral surface of the testing needle. The detachable fixing structure can also be in other forms, if the mounting hole is correspondingly formed in the insulating shell on the mainboard, the mainboard is fixed in the inner cavity of the insulating shell through screwing the screw in the mounting hole, or the flanging is arranged on the mainboard, the connecting plate is arranged in the insulating shell, and the flanging and the connecting plate are connected through the screw to fix the mainboard in the insulating shell. The pen tail cover can be provided with no battery groove, and the upper side of the mainboard can be provided with a battery mounting structure to fix the battery on the mainboard. The number of the oblong holes in the side wall of the insulating shell can be set according to the requirement of an injection molding process, and can be four or other. The surface sticker can also be adhered without sticking after injection molding. The insulating housing may not be an integral structure, such as a large hole section and a small hole section of the insulating housing are respectively integrally injection-molded, the test needle and the small hole section form an integral structure, and the large hole section and the small hole section are inserted and assembled together.

Claims

1. The utility model provides a TDS pen, includes shell, test needle and mainboard, and the front end of shell, its characterized in that are located to the test needle: the testing needle is provided with a testing needle contact conductive part, the mainboard is provided with a mainboard contact conductive part which is used for being in contact with the testing needle contact conductive part, the mainboard is fixedly arranged in the inner cavity of the shell through a detachable fixing structure, the inner cavity of the shell is provided with a guide structure for the mainboard to be assembled from back to front, the guide structure comprises guide grooves which are arranged at the left side and the right side of the shell and are used for the mainboard to be assembled from back to front, reinforcing ribs are arranged above the testing needle on the inner wall of the shell, a space for the front end part of the mainboard to enter is arranged between the lower side surfaces of the reinforcing ribs and the outer peripheral surface of the testing needle, the lower side surfaces of the reinforcing ribs form a limiting surface which is used for being in limiting fit with the upper side surface of the mainboard, the reinforcing ribs are provided with a guide surface which is inclined towards the testing needle from back to front, and is used for being in guide fit with the front end of the mainboard from the rear end of the shell, when the TDS pen is assembled, the mainboard is followed the guide slot direction is removed, and the preceding tip of mainboard passes through in guide surface and spacing face stretch into the space between strengthening rib and the test needle, make mainboard contact conduction portion and test needle contact conduction portion conductive contact cooperation, realize the electric connection of test needle contact conduction portion and mainboard contact conduction portion.

2. The TDS pen of claim 1, wherein: last conducting bar and lower conducting bar that extend around being equipped with on the inside wall about the shell, the guide slot is formed between last conducting bar and lower conducting bar, and the length of going up the conducting bar is less than the length of conducting bar down, and the preceding tip of lower conducting bar is located the rear of conducting bar front end portion, forms between the rear end of going up the conducting bar and the rear end of lower conducting bar to be used for dodging the mainboard on the operating button dodge the space.

3. The TDS pen of claim 2, wherein: the end faces of the rear ends of the upper guide bar and the lower guide bar are guide inclined planes which are gradually inclined towards the inner side of the guide groove from back to front.

4. The TDS pen of any of claims 1-3, wherein: the testing needle conductive part is the outer peripheral face of the testing needle, and the mainboard contact conductive part is in contact fit with the outer peripheral face of the testing needle.

5. The TDS pen of claim 4, wherein: the mainboard contact conductive part is a pad arranged on one side of the mainboard, and the pad is provided with a pad end face of a plane structure in contact fit with the peripheral surface of the corresponding test needle.

6. The TDS pen of any of claims 1-3, wherein: the mainboard is protruding style of calligraphy, and the left and right sides of protruding style of calligraphy mainboard has the fender shoulder that is used for with shell stop cooperation.

7. The TDS pen of any of claims 1-3, wherein: the detachable fixing structure comprises a pen tail cover buckled at the rear end of the shell, and the main board is fixed in the shell under the blocking action of the pen tail cover.